Health and environment
mostafa baghani; Abolfazl Rahmani Sani
Volume 30, Issue 1 , May and June 2023, , Pages 13-21
Abstract
Introduction: Population growth causes the need to produce more agricultural products. And the lack of water causes people to use unconventional waters, including treated sewage. Improper quality of wastewater can be harmful to the soil, plants and the health of consumers. Therefore, it is necessary ...
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Introduction: Population growth causes the need to produce more agricultural products. And the lack of water causes people to use unconventional waters, including treated sewage. Improper quality of wastewater can be harmful to the soil, plants and the health of consumers. Therefore, it is necessary to measure and check their quality.Materials and Methods: In this study, the factors of EC, BOD, COD, TSS, TN, TP, PH, Ecoli, TC, CL,Ca, Mg, Na, SAR in effluent treatment plants, Sabzevar stabilization pond, activated sludge (Factory sanitary wastewater) and rural Wetland with Tested by standard methods. (according to 2017 version of the book Standard Methods for the Examination of Water and Wastewater) and compared with Wilcox, Ayers and Westcot, FAO, WHO, USEPA standards.To determine the competence of three different types of effluent for agricultural use.Results: In accordence with the standards of Iran, Wilcox, Ayers and Westcot, FAO and WHO, all three types of effluent can be used for irrigation with low to moderate negative impacts. However, in the more stringent standards (USEPA), stabilization pond and Wetland did not meet the BOD, TSS factors threshold, and the activated sludge effluent did not provide the BOD factor.Conclusion: According to the results, the activated sludge treatment system meets the standards of wastewater consumption in agriculture better than the other two systems. Over time, the standards will become stricter. Choosing the type and correct operation of the treatment system has a significant impact on providing the quality standards of effluent for irrigation.
Health and environment
atefeh dehnabi; ahmad Allahabadi; MohammadHossein Saghi; Forough Riahimanesh
Volume 29, Issue 4 , September and October 2022, , Pages 531-548
Abstract
Introduction: Today, heavy metals and organic compounds such as dyes are among the most dangerous pollutants that have entered surface and groundwater and threaten human health. The aim of this study was to investigate the removal of reactive orange 3R dye and chromium by adsorption separately and simultaneously ...
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Introduction: Today, heavy metals and organic compounds such as dyes are among the most dangerous pollutants that have entered surface and groundwater and threaten human health. The aim of this study was to investigate the removal of reactive orange 3R dye and chromium by adsorption separately and simultaneously activated carbon.
Materials and Methods: In this study, Sycamore carbon modified with NH4Cl was used to remove contaminants. Effect of variables such as pH (2-9), adsorbent concentration (0.5-1-0 g/L), pollutant concentration (10-50 mg/L) and contact time (2-40 minutes) on dye and chromium removal (simultaneously and separately) were calculated. Freundlich and Langmuir adsorption isotherm models and kinetics were also investigated.
Results: The results of this study showed that activated carbon at pH = 4, 0.4 g/L adsorbent at 15 min contact time has the best removal conditions for both paint and chromium contaminants. Under optimal conditions, activated carbon was able to remove 72% of chromium and 84% of dye separately and 59% of chromium and 67% of dye simultaneously in solution at a concentration of 25 mg/L. The study of adsorption isotherms also showed that the experiments were more consistent with the Freundlich model.The absorption kinetics follows Pseudo-second order equations.
Conclusion: According to the results, this adsorbent has a good performance in separate and simultaneous removal of paint and chromium and can be used to treat wastewater containing organic and inorganic contaminants.
Health and environment
Mohammad Hasan Kowsari; MohammadHossein Saghi; ayoob rastegar; Somayeh Sotude
Volume 29, Issue 1 , May and June 2022, , Pages 65-76
Abstract
Background: Even in engineered landfills in developed countries, leachate production cannot be avoided and it contains different types of heavy metals. Therefore, landfills are one of the main sources of increased concentrations of heavy metals in the soil. The purpose of this study was to evaluate the ...
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Background: Even in engineered landfills in developed countries, leachate production cannot be avoided and it contains different types of heavy metals. Therefore, landfills are one of the main sources of increased concentrations of heavy metals in the soil. The purpose of this study was to evaluate the severity of contamination of soils around Sabzevar landfill with heavy metals and to prepare a soil contamination map with heavy metals.Methods: Samples of surface and deep soils were collected in 18 stations according to the type of soil and distance from landfill Sabzevar. The concentrations of heavy metals Arsenic, Zinc, Lead, Chromium, Copper, Mercury and Cadmium were analyzed by ICP-OES. The intensity of soil contamination was assessed using Index Geoaccumulation Potential ecological risk index.Results: The mean concentrations of Arsenic, Zinc, Lead, Chromium and Copper in surface soil, respectively are, 6.013, 41.04, 6.31, 26.77 and 31.45 mg/kg of Mercury and Cadmium, respectively, 60.79 and 61.60 μg/kg, respectively. But the mean concentration of Arsenic, Zinc, Lead, Chromium and Copper in depth soil, respectively are, 5.75, 38.33, 6.25, 22.68 and 31.04 mg/kg, Mercury and Cadmium, respectively, 66.57 and 59.98 μg/kg, the value of all proportion to Natural background values are higher.Conclusion: Based on estimates of Igeo and RI indices for heavy metals Arsenic, Lead, Zinc, Chromium and Copper in the soil showed no contamination but for Mercury and Cadmium showed severe contamination.
Health and environment
Mousa Aminivafa; Ahmad Allahabadi; Golamreza Moussavi; Hosein Fahimi
Volume 28, Issue 6 , January and February 2022, , Pages 838-849
Abstract
Background and Objectives: Antibiotics, comprising a significant amount of pharmaceutical compounds, are used as human and veterinary treatments . these antibiotics come to appear as contaminantoin soil, surface water, groundwater, and even drinkingwater.Advanced oxidation processes such as catalytic ...
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Background and Objectives: Antibiotics, comprising a significant amount of pharmaceutical compounds, are used as human and veterinary treatments . these antibiotics come to appear as contaminantoin soil, surface water, groundwater, and even drinkingwater.Advanced oxidation processes such as catalytic ozonation are effective to remove the antibiotics form water and wastewaterThe aim of this study was to investigate the efficiency of Catalytic Ozonation Process for tetracycline antibiotics removal from contaminated watersMaterial and method:In this design, an ozonation pilot with a volume of 200 cc was used. In each experiment, the tetracycline solution was poured into the desired concentration, the pH of the sample was adjusted with sulfuric acid and NaOH. At different times of 5 to 30 minutes and different pHs of 2 to 10 ozonation was performed at the dose of 0.8 mg/min. Then, under these conditions, ozonation was performed in the presence of activated carbon catalyst and a sample was discharged from the pilot and analyzed (HPLC) to determine the remaining tetracycline.Results:The results showed that under optimum conditions of pH= 8 and ozone dose of 0.8 mg / min and contact time of 30 minutes ozonation only eliminated 59% of tetracycline and in the same conditions catalytic ozonation with 0.01 g/L carbon. The Calligonum comosum tree was able to remove 100% tetracycline in 30 minutes.Conclusion: The results of this study showed that carbon catalyzed ozonation from wood Calligonum comosum waste can be used as an advanced treatment method.
Health and environment
Ahmad Bashtani; Elahe Amouzadeh; Jamshid Yazdani Cherati; Siavash Etemadinezhad; Hossein Kalateh Arabi; Kalteh Haji Omid
Volume 28, Issue 6 , January and February 2022, , Pages 874-884
Abstract
One of the most important factors causing musculoskeletal disorder is awkward body posture during work. Ergonomic interventions to improve working posture are essential. Improving posture is effective in promoting health, reducing stress and reducing work discomfort, it is also an important factor in ...
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One of the most important factors causing musculoskeletal disorder is awkward body posture during work. Ergonomic interventions to improve working posture are essential. Improving posture is effective in promoting health, reducing stress and reducing work discomfort, it is also an important factor in terms of work efficiency and job performance. There is a close relationship between posture and work efficiency, which has led to improved posture, increased efficiency and job performance.materials and methods:The present quasi-experimental research is a descriptive-analytical study that has been performed on 164 employees of small workshops. This study was performed in three stages including ergonomic evaluation of employees' posture using REBA evaluation method, interventions and post-intervention post-re-evaluation. WILCOXON statistical method was used to analyze the results.findings:The results of this study showed the improvement of posture in the organs of neck, trunk, arm, forearm, wrist and legs. Also, the comparison of overall score and risk level before and after the intervention was significant (P
Health and environment
Ramezan Sadeghi; Mehraban Sadeghi; Rahman Abdizadeh; Morteza Sedehi; Morteza Hashemzadeh Chaleshtori; Shahrbanou Parchami Barjui; Mohammad Rasoul Asadi Amirabadi
Volume 28, Issue 6 , January and February 2022, , Pages 982-994
Abstract
Backgrounds: Similar to some organic materials the heavy metals are not easily removed from the environment because of the toxic nature and form a class of stable and non-biodegradable pollutants. These elements enter the nature and the food chain as a result of natural activities such as eruptions of ...
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Backgrounds: Similar to some organic materials the heavy metals are not easily removed from the environment because of the toxic nature and form a class of stable and non-biodegradable pollutants. These elements enter the nature and the food chain as a result of natural activities such as eruptions of volcanoes and human activities such as mining, producing industrial and urban wastewaters and applying pesticides.Materials and Methods: In this study, chrome (VI) -resistant bacteria were isolated from the industrial wastewater taken from Isfahan Mobarakeh Steel Complex. The isolated strains were identified and their resistance to chromium was determined and the strain with the highest resistance to chromium was used for its bioremediation.Data were analyzed using descriptive statistics and one way ANOVA.Results: The results of this study led to the identification of five chrome resistant strains that the Micrococcus luteus SEHD031RS bacterium was detected as the best chrome resistant strain due to the minimum inhibitory concentration of 140 mgL-1 and minimum bactericidal concentration of 152 mgL-1. In this study, the highest chromium removal rate of 82.5% was obtained at pH 4, concentration of 30 mgL-1 and 96 hours.Conclusion: The results of this study indicate that the Micrococcus luteus SEHD031RS strain can be used as an effective microorganism in removing chromium from industrial wastewater or environmental bioremediation.
Health and environment
Reza Hekmatshoar; Shahrzad Khoramnejadian; Ahmad Allahabadi; MohammadHossein Saghi
Volume 28, Issue 4 , September and October 2021, , Pages 533-544
Abstract
Introduction: Penicillin G (PG) is one of the most widely antibiotics used around the world. The release of PG in an aqueous solution leads to contamination of water resources. This study aimed to determine the efficiency of modified Eskanbil activated carbon for the removal of PG from aqueous solutions. ...
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Introduction: Penicillin G (PG) is one of the most widely antibiotics used around the world. The release of PG in an aqueous solution leads to contamination of water resources. This study aimed to determine the efficiency of modified Eskanbil activated carbon for the removal of PG from aqueous solutions. The NH4Cl-induced activated carbon was synthesized by a simple method and used for the degradation of PG in contaminated water.
Materials and Methods: Activated carbon was characterized by Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), and Brunauer–Emmett–Teller (BET) surface area analysis. The influence of important parameters including solution pH, contact time, and initial PG concentration, and dosage of adsorbent was examined on the efficiency of EAC in degradation of penicillin G in aqueous solution.
Results: The synthesized carbon was characterized. The BET results indicated that the surface area of the Activated Carbon catalyst was1473 m2/g. The maximum PG adsorption onto EAC was observed at the pH of 6. The PG removal of 33% at an EAC concentration of 0.1 g/L increased to 99.98% at an activated carbon concentration of 0.5 g/L. The isotherm and kinetic studies of PG removal by EAC showed that the Freundlich model (R2>0.995) and the pseudo-second-order (R2>0.983) equation represented the best fit with the adsorption data.
Conclusion: EAC is recommended as a suitable and cost-efficient adsorbent for removing poisons, pharmaceuticals, and other emerging contaminants from water resources.
Health and environment
roya moradi; morteza kashefialasl; reza marandi; esmaeil salahi; sharam moradidehaghi
Volume 28, Issue 3 , May and June 2021, , Pages 347-357
Abstract
Introduction: Since removal of dyes causing cancer from colored wastewater before releasing into environment is very important therefore in this study the effective parameters in removal of dye AR 18 with a new organic adsorbent were investigated by combining the two methods (adsorbent) and chemical ...
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Introduction: Since removal of dyes causing cancer from colored wastewater before releasing into environment is very important therefore in this study the effective parameters in removal of dye AR 18 with a new organic adsorbent were investigated by combining the two methods (adsorbent) and chemical method (AOPS). Materials and Methods: Firstly, a rotary reactor was made up then for each experiment 100mL of sample was exposed to UV ray, H2O2 and extracted carbon from carrot meal. In this study low power UV lamps and in a reactor with capacity of 1.5L were used. Properties of adsorbent were studied and illustrated via TEM, SEM, XRD. Effects of parameters such as pH, UV radiation contact time, concentration of dye and concentration of adsorbent were examined and optimum points of each parameter obtained. Inlet and outlet of dye concentration was measured by spectrophotometer. adsorption Equilibrium and adsorption kinetics with maximum adsorption capacity were measured accordingly. Results: Physical properties of active magnetite carbon showed that Fe3O4 nanoparticles had average size of 22-90 nm with the BET of 480 m2/g. acid red dye 18 was removed with 99 % efficiency where adsorbent concentration: 1/5gr.L, dye concentration: 25 ppm, pH: 4 and contact time: 80 min. adsorption capacity: 126/98 mg/g and adsorption kinetics is in line with Pseudo-second-order model (R2=0/99, AR 18). Conclusion: Results of this study showed that using extracted carbon from carrot meal together with UV radiation as a low cost adsorbent, Eco-friendly is significantly effective in dye removal via.
Health and environment
alireza mohammad zadeh; rogheye hojjatpanah; Seyed Ali Sajjadi; jalal mardaneh; Nezami Hossein; Mehdi Ghasemi
Volume 28, Issue 2 , May and June 2021, , Pages 214-221
Abstract
Introduction: Nosocomial infections are one of the most important problems in hospitals and medical centers which cause loss of economic resources increased length of stay in hospitals and mortality. Correct and appropriate use of antiseptic and disinfectants play an important role in reducing infections. ...
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Introduction: Nosocomial infections are one of the most important problems in hospitals and medical centers which cause loss of economic resources increased length of stay in hospitals and mortality. Correct and appropriate use of antiseptic and disinfectants play an important role in reducing infections. In this study the efficacy of the Current Disinfectants on Bacteria Isolated from Different Wards of an Educational Hospital has been studied.
Materials and methods: In this cross-sectional study, a total of 245 samples were taken from different wards of Allameh Behlul Hospital in Gonabad. Samples were taken before and after disinfection with disinfectants of Deconnex AF50, Peranacide M1, microzed GPH and Sarphosepte Quicks. Samples were cultured on special culture media and identified by biochemical tests and the number of colonies was determined. Data were analyzed using Wilcoxon statistical test.
Results: In the present study, microbial contamination of different sections showed that the most gram -positive bacteria were isolated included Staphylococcus epidermidis, and the most Gram -negative bacteria were isolated included, Escherichia coli. Mean before and after disinfection in deconox and microzed disinfection was significantly different in all parts (P <0.05). For peranaside disinfection in Internal and NICU sections, and in ICU and Maternity before and after There was no significant difference in disinfection (P> 0/05).
Conclusion: The results of this study showed that Deconex and Microzed were among the most effective disinfectants. Peranaside disinfectant in the maternity and NICU sections, and the Sarphosepte Quicks were also less effective in the Internal and ICU sections, but had good efficacy in other sections.
Health and environment
tahereh zarei mahmoudabadi; Mohammad Hassan Ehrampoush; parvaneh talebi
Volume 28, Issue 3 , May and June 2021, , Pages 397-405
Abstract
Introduction: The production of high wastewater is one of the problems of recycling paper industry, it is essential to provide appropriate economic and environmental solutions for proper management and treatment. So in this research, the purpose was of optimization the treatment of wastewater products ...
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Introduction: The production of high wastewater is one of the problems of recycling paper industry, it is essential to provide appropriate economic and environmental solutions for proper management and treatment. So in this research, the purpose was of optimization the treatment of wastewater products from the paper recycling industry with using magnesium chloride in combination with cationic and anionic polyacrylamides.
Materials and Methods: This was an applied researchwhich was done on a laboratory scale. The different pH (4-12) values at a fixed concentration of magnesium chloride to determine the optimum pH was investigated. Then optimization of concentration for magnesium chloride (200-700 mg/L) and polyacrylamides (0.5-3 mg/L) was performed. At each stage of optimization, the parameters of TSS and COD were measured. Pearson correlation coefficient was used for analysis of data and significance level was 0.05.
Results: According to the results, pH=10 as optimal pH and concentrations of 500 and 1.5 mg / L were selected as optimal concentrations for magnesium chloride and cationic polyacrylamide, respectively. Under optimal conditions, the efficiency of removing TSS and COD was 96% and 83.07%, respectively.
Conclusion: The results showed that magnesium chloride combined with cationic polyacrylamide, can be used as an appropriate option for wastewater treatment of paper recycling industries.
Health and environment
Seyyed Mostafa Abtahi; Mohammad Taghi Alipour; Mahmoud Naghdbishi; Gea Oliveri Conti; Mohammad Miri
Volume 28, Issue 1 , January and February 2021, , Pages 56-66
Abstract
Introduction: Polycyclic aromatic hydrocarbons (PAHs) have several adverse effects on human health and environment in the short and long term. In this study, a systematic review of the studies carried out to date on the removal of PAHs from contaminated soils by electrokinetic method and determining ...
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Introduction: Polycyclic aromatic hydrocarbons (PAHs) have several adverse effects on human health and environment in the short and long term. In this study, a systematic review of the studies carried out to date on the removal of PAHs from contaminated soils by electrokinetic method and determining the parameters affecting this process has been investigated. Materials and Methods: This research is a systematic review study. For this purpose, the keywords related to PAHs pollutants and electrokinetic methods were first prepared. Search in scientific databases including Scopus, Web of Science and PubMed was done. After completion of the search, the findings of search was transferred to the Endnote software and screening was done to reach articles that are fully related to the subject. Results: A total of 571 articles were found until September 10, 2018 from the mentioned data basis. Then, 10 studies were carefully reviewed after removing duplicates and non-compliant items. The included studies were from 2000 to 2017. In 3 studies, electrochemical methods with surfactants and biosurfactants were used. Four studies utilized biodegradation techniques along with electro-kinetics. Combination of the electrokinetic with other processes can increase the efficiency of this process in removing PAHs from soil in a short period (less than 1 month). Conclusion: Considering the influence of different parameters on the process, it is recommended to conduct a pilot test to optimize the process before the implementation of this method.
Health and environment
MohammadHossein Saghi; reza malayjerdya; SEDIGHE RASTAGHI; A Rastgar; hosein rezaee
Volume 27, Issue 4 , November and December 2020, , Pages 514-519
Abstract
Introduction: In recent years, the uses of chemical pesticides in agricultural crops more than the world standards. The aim of this study was evaluate the knowledge, attitude and practice of farmers in Jovuin on the environmental health aspects of pesticide use in the 2018 years.
Materials and Methods: ...
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Introduction: In recent years, the uses of chemical pesticides in agricultural crops more than the world standards. The aim of this study was evaluate the knowledge, attitude and practice of farmers in Jovuin on the environmental health aspects of pesticide use in the 2018 years.
Materials and Methods: This is a cross-sectional study. The population of this study is farmers of Jouvin of Khorasan Razavi province. The sample size for study was 100 farmers. The data obtained with a standard questionnaire and data analysis was performed using SPSS version 20 software.
Results: The knowledge, attitude and practice of farmers in relation to environmental health and safety principles during spraying indicate that the average score was 12.43 in attitude and awareness, but the very low mean score of individuals (5.46) in the performance. Also Pearson analysis showed the have scientific relation with attitude and awareness. (P-Value>0.05)
Conclusion: The practice of farmers in this study has received a very low score. This subject requires the scientific and practical training of farmers so that they can be used to reduce the amount of toxins consumed and thus reduce the pollution of the environment
Health and environment
Mahboube Eskandari; Nasser Goudarzi; Mansour Arab chamjangali; Seyyed Gholamreza Moussavi
Volume 27, Issue 2 , July and August 2020, , Pages 131-141
Abstract
ABSTRACTBackground: The photocatalytic process has been used for many years in industrialized countries as a solution to the world's environmental pollution. During the oxidative photo-catalytic processes, the pollutants are completely degraded by UV irradiation in the presence of semi-conductor catalysts, ...
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ABSTRACTBackground: The photocatalytic process has been used for many years in industrialized countries as a solution to the world's environmental pollution. During the oxidative photo-catalytic processes, the pollutants are completely degraded by UV irradiation in the presence of semi-conductor catalysts, and are converted to CO2 and H2O. In this work, for the first time, the use of a 9-Watt UVC lamp with synthetic zinc oxide nanoparticles for degradation of atenolol is studied.Material and method: The main objective of this work is to investigate the effect of synthetic zinc oxide photo-catalyst on the rate of destruction of atenolol as an organic pollutant in wastewater using low-intensity UV light. The effects of parameters such as concentration of atenolol, amount of photo-catalyst, pH, stirring rate, atmospheric nitrogen, and presence of various ions are studied in the photocatalytic reaction.Results: An oxidation reaction is performed under the optimal experimental conditions, i.e. 20 mg L-1 of atenolol, 10 mg L-1 of the photo-catalyst, pH 7.0, and a stirring rate of 600 rpm. After 120 minutes of irradiation, atenolol was degraded completely. Kinetic studies under optimized conditions are shown pseudo- first order kinetic.Conclusion: The results of this study indicate the acceptable performance of the photocatalytic degradation process of synthetic zinc oxide nanoparticles and 9-watt mercury vapor lamp in the decomposition of atenolol.
Health and environment
Khadijeh Yari; Mostafa Leili; Hassan Zolghadrnasab; Shima Mohammadi bolban; Shahla Rahmani
Volume 27, Issue 1 , May and June 2020, , Pages 93-100
Abstract
Background: The consumption of bottled water in various parts of the world have significantly increased. The aim of this study was to evaluate the physical, chemical and microbial quality of bottled waters in Hamadan in 2016.Materials and Methods: This research is a descriptive cross-sectional study, ...
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Background: The consumption of bottled water in various parts of the world have significantly increased. The aim of this study was to evaluate the physical, chemical and microbial quality of bottled waters in Hamadan in 2016.Materials and Methods: This research is a descriptive cross-sectional study, that was carried out on 5 popular brands and 40 randomly selected samples, in which 20 types of physical, chemical and microbial characteristics were investigated. All data were analysed using the statistical software package, SPSS 20.0 and descriptive statistics.Results: The results showed that none of the samples had microbial contamination and passed the required standards. Total dissolved solids (TDS) content are lower than the minimum values required by the Food and Drug Administration (500 mg/L). The differences between the measured and labeled values was investigated using paired t-test. Based on the results, there were differences between the measured and labeled values for all parameters, where for the parameters of nitrite, TDS and chloride it was significant, while for the rest of the parameters it was not significant. The mean values of the parameters were also compared with the standard values using one sample t-test. Conclusion: For the most samples, the assessed parameters were consistent with the standards, however, for the few number of samples which violates from the standard values it was also important in terms of the possible health impacts, thus should be taken into consideration.
Health and environment
Parisa Baratpour; Seyed Gholamreza Moussavi; Ahmad Alahabadi; Sakine Shekoohiyan
Volume 26, Issue 6 , March and April 2020, , Pages 797-807
Abstract
Background & Objective: With industrial development and population growth, the emerging contaminants enter into the natural water resources. Therefore, in this study Adsorption potential of NH4Cl-induced activated carbon (NAC) was investigated to remove antibiotic sulfanilamide from contaminated ...
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Background & Objective: With industrial development and population growth, the emerging contaminants enter into the natural water resources. Therefore, in this study Adsorption potential of NH4Cl-induced activated carbon (NAC) was investigated to remove antibiotic sulfanilamide from contaminated water.Materials &Methods: The effect of operational conditions including solution pH, NAC concentration, sulfanilamide initial concentration and contact time were studied. Results: NAC and SAC had specific surface area of 1029, 1024 and mean pore volume of 2.64, 2.23nm, respectively. With increasing the NAC concentration to 1 g/L, sulfanilamide adsorption efficiency increased to 84.4% within 40 min. Then the adsorption slightly increased with the increase in the contact time to 120 min and reached to its maximum adsorption of 99.2%. The maximum adsorption percentage of sulfanilamide onto SAC under similar conditions reached to 49.2%. The kinetics analysis showed that experimental adsorption data for both NAC and SAC were best fitted to the pseudo-second-order model. The maximum adsorption capacity of sulfanilamide onto NAC and SAC, calculated by the Langmuir model, was 238.1 and 87/7 mg/g, respectively.Conclusion: Generally, these results showed that NAC was an efficient adsorbent with high removal efficiency for eliminating the antibiotics from the contaminated water streams
Health and environment
Soltan-Dallal Mohammad mahdi; Zohreh Didar
Volume 26, Issue 5 , November and December 2019, , Pages 575-583
Abstract
In this study, the synthesis of nanoparticles of manganese-zinc oxide and zinc iron oxide by chemical co- precipitation method performed and investigation of structural and morphological properties of related nanoparticles using Fourier Infrared spectrum, X-ray diffraction and Transmission electron microscopy ...
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In this study, the synthesis of nanoparticles of manganese-zinc oxide and zinc iron oxide by chemical co- precipitation method performed and investigation of structural and morphological properties of related nanoparticles using Fourier Infrared spectrum, X-ray diffraction and Transmission electron microscopy were carried out. Antimicrobial effects against shigella flexneri (PTCC 1234) determined by inhibitory diameter zone method. Synergistic effect of nanoparticle with hydrogen peroxide and hypochlorite sodium also assessed by calculation of the fractional inhibitory concentration (FIC) index. Structural analysis of Mn- ZnO and Fe- ZnO nanoparticle revealed that co- precipitation is a suitable method for synthesis of these nanoparticles. Results of antimicrobial tests showed that Mn- ZnO nanoparticles has more antibacterial effect against shigella flexneri than Fe- ZnO nanoparticles. Inhibitory zone diameter of Mn- ZnO and Fe- ZnO were 25 and 14 mm, respectively. In addition, both doped nanoparticle exhibited more antimicrobial effect than zinc oxide nanoparticle so, doping cause increasing antimicrobial effect of zinc oxide nanoparticle. Furthermore, combination of nanoparticles with hydrogen peroxide and hypochlorite sodium showed synergistic effects which was complete synergistic at high concentration and partial synergistic at low concentrations.
Health and environment
Ali Esrafili; Maryam Izanloo; Mahdi Farzadkia; Ahmad Joneidi Jafari; Mina Yousefi
Volume 26, Issue 4 , November and December 2019, , Pages 535-546
Abstract
Nowadays,due to the irreparable effects imposed on aquatic ecosystems,organisms and humans,the removal of heavy metals and herbicides from water sources has extremely become vital.In recent years, the process of adsorbing contaminants with magnetic nanoparticles has gained lots of attention.Therefore, ...
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Nowadays,due to the irreparable effects imposed on aquatic ecosystems,organisms and humans,the removal of heavy metals and herbicides from water sources has extremely become vital.In recent years, the process of adsorbing contaminants with magnetic nanoparticles has gained lots of attention.Therefore, the present study aimed to synthesize nanoparticles as an adsorbent for adsorption of the contaminants of Pb and 2,4-D from water. Materials and methods:To evaluate the effect of independent variables such as pH(3-11),contact time(0-150min),adsorbent dose(0.2-1.2g/L) and adsorbate concentration(5-50mg/L) on the contaminant removal and determine the optimal conditions, the method of one factor at the time was used by design expert software. Nanoparticles were synthesized via a co-precipitation method and their morphology were characterized by TEM,XRD,FT-IR and SEM. Finally, the experiments were performed on aqueous solution. Results: Structural analysis revealed that adsorbent has a spherical structure with a Fe3O4 core and SiO2 shell, modified by both amine and thiol functional groups.The results of experiments showed that the maximum adsorption efficiency of single system occurred at pH 5 and contact time 40 min for lead and at pH6 and contact time 90min for 2,4-D.Also the optimal values of adsorbent dose and initial concentration obtained 0.8 g/L and 10 mg/L. In the binary adsorption system,the maximum adsorption efficiency determined at pH 6 and contact time 40 min for lead and contact time 60 min for 2,4-D and adsorbent dose 1.2 g/L. Conclusion:According to the results,the bi-functional nanoadsorbent could be effectively used for the simultaneous removal of inorganic and organic pollutants from various aqueous solutions.
Health and environment
Amirhossein Baghaie; Mehran Keshavarzi
Volume 26, Issue 3 , September and October 2019, , Pages 293-302
Abstract
soil pollution to heavy metals is elevating that is dangerous for human health. According to this, mining activities to extract different heavy metals such as Pb and Cd can increase soil pollution. Thus, this research was done to evaluate Health risk assessment of heavy metals (Cd and Pb) in greenhouse ...
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soil pollution to heavy metals is elevating that is dangerous for human health. According to this, mining activities to extract different heavy metals such as Pb and Cd can increase soil pollution. Thus, this research was done to evaluate Health risk assessment of heavy metals (Cd and Pb) in greenhouse products harvested from greenhouses around Irankooh mine.Materials and Methods: In this study 10 cucumber, tomato and bell pepper greenhouses were selected randomly around Irankooh mine. At the time of harvest, fruit and soil sampling were done. In each sampling, 10 fruit samples of each products and soil surface from different parts of greenhouses were randomly selected for analysis.Results: The highest and lowest daily intakes of Cd and Pb in the group age of 3-6 were determined with daily consumption of 55 and 100 g bell pepper and cucumber, respectively. The same results were observed for adult people in the age 18-35. The hazard quotient of Cd for all age groups was greater than the Pb hazard quotient. The highest hazard quotient of both Cd and Pb were due to the dermal contact with polluted soil and the lowest of them results from oral way. Conclusions: The results of this research were shown that high Pb and Cd concentration in the greenhouse vegetable which produced around Irankkoh is an important concern for consumers health of these vegetables that should be more considered.
Health and environment
Zahra Ordudari; Farzane Fadaei
Volume 26, Issue 3 , September and October 2019, , Pages 329-335
Abstract
Introduction and Aims: Some of people prefer daily activities; others, nightly ones. Studies have shown that performance levels may be affected by circadian rhythms. The high mental workload occurs when the task is greater than the capacity of the operator. Regarding the probable relationship between ...
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Introduction and Aims: Some of people prefer daily activities; others, nightly ones. Studies have shown that performance levels may be affected by circadian rhythms. The high mental workload occurs when the task is greater than the capacity of the operator. Regarding the probable relationship between circadian types and mental workload, we decided to evaluate this factor in the assembly workers of a manufacturing company.Materials and Methods: The study was a descriptive -analytic and cross-sectional one being carried out among 120 female assembly workers of manufacturing company. In order to evaluate of circadian types and mental work load, Iranian version of MEQ (Moring- Evening Questionnaire) and NASA-TLX (NASA-Task Load Index) have respectively been used. Data analysis was carried out by using SPSS 20. It is noteworthy to mention that P value
Health and environment
Alireza Rahmani; Mostafa Leili; Jamal Mehralipor; Marzihe bagheri; Amir shabanloo; sonia chavoshi
Volume 26, Issue 2 , July and August 2019, , Pages 225-232
Abstract
Background: The use of (advanced oxidation processes) AOPs, due to have high performance in degradation of organic compounds is growing. Combined use of electrical current and sulfate free radical creates a synergy effect on removal of pollutant. The aim of this study was to evaluation the performance ...
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Background: The use of (advanced oxidation processes) AOPs, due to have high performance in degradation of organic compounds is growing. Combined use of electrical current and sulfate free radical creates a synergy effect on removal of pollutant. The aim of this study was to evaluation the performance of activated per sulfate by the electrochemical method with copper – iron electrodes for removal of Aniline from aqueous solution.Materials and Methods: In this experimental study, a batch electrochemical reactor with a useful volume of 250 mL, copper and iron electrodes with 2×10×50 mm area from the DC source to aniline degradation was used. Also the Influence of parameters such as pH, Voltage (with amper), initial concentration of per sulfate and initial concentration of Aniline was investigated. Aniline concentrations, determined by spectrophotometer DR5000 making HACH.Results: The experimental results indicated that the removal of aniline was influenced by different operational parameters, So that the highest process efficiency was obtained at pH 4, a voltage of 11 V, a concentration of per sulfate anions equal to 750 mg /L and a concentration of 60 mg /L of pollutant, 90.41% in a 25 minute period. It was also found that with an increase of nitrogen gas, efficiency will be increase and aeration reduces efficiency.Conclusion: The present study demonstrated the proper performance of the process in removing organic pollutants under optimal conditions of use as well as an alternative technology for the treatment of industrial wastewater containing Aniline.
Health and environment
Amirhossein Baghaie; Reza Jafarinia
Volume 26, Issue 1 , March and April 2019, , Pages 25-33
Abstract
Background & Objectives: Soil pollution with heavy metals can decrease Fe availability in human food chain in industrial regions. This research was done to investigation the quality of tomato grown in a soil treated with iron slag and its effect on human health.Materials and Methods: This research ...
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Background & Objectives: Soil pollution with heavy metals can decrease Fe availability in human food chain in industrial regions. This research was done to investigation the quality of tomato grown in a soil treated with iron slag and its effect on human health.Materials and Methods: This research was done in 2016 in a greenhouse experiment in Arak province with 72 pots including: applying 0, 15 and 30 t ha-1 cow manure enriched with 0 and 10% (W/W) iron sludge in a Pb polluted soil (0, 600, 800 and 1000 mg Pb kg-1 soil). At the end of experiment, fruit Fe concentration was measured and Fe daily intake for 4 to 50 years group was calculated.Results: Consumption of 80 g tomato which cultivated in soil treated with 30 t ha-1 enriched cow manure with iron slag can supply 18.4% Fe daily requirement for the children in the range 4 to 8 years. With increasing the Pb soil pollution up to 1000 mg/kg soil, only 12.1% Fe requirement was supplied in this age group.Conclusion: The results of this experiment showed that applying enriched cow manure with iron slag has affect on increasing Fe requirement from tomato consumption. However, tomato cultivation in Pb polluted soil can decrease fruit Fe concentration and thereby, decrease the human Fe intake.
Health and environment
Ahmad Allahabadi; Abolfazl Rahmani Sani; MohammadHossein Saghi; Hamideh Behrozikhah; Shahram Sadeghi; Mohammadreza Behrouzikhah
Volume 26, Issue 1 , March and April 2019, , Pages 63-71
Abstract
AbstractBackground: One of the most important environmental pollutants that there is in sewage of different industrials is cyanide to cause pollution of water sources that are dangerous to humans and the environment. Cyanide can be removed in different ways from the aqueous media, but most of these methods ...
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AbstractBackground: One of the most important environmental pollutants that there is in sewage of different industrials is cyanide to cause pollution of water sources that are dangerous to humans and the environment. Cyanide can be removed in different ways from the aqueous media, but most of these methods are costly. Therefore, the aim of this study is the removal cyanide using iron nanoparticles. Material and Methods: Removal of cyanide from aqueous media using iron nanoparticles in various conditions including the effect of the adsorbent, initial cyanide concentration, contact time and pH were studied in discontinuous phase. In this study, adsorption equilibrium and also the kinetics of the reaction examined.Results: In the process of sharing discontinuous, the balance was achieved after 120 minutes of contact time and maximum amount of removal cyanide in the pH =11 for cyanide concentration of 2.5 mg/L and 1 gr of nanoparticle over 97% obtained. Also the results showed that the adsorption process fitted with Langmuir isotherm and chemical kinetic fitted with of secondary grade.Conclusion: According to the findings, iron nanoparticles can be used as a suitable option for removal cyanide from aqueous solution in hazardous waste. Keywords: iron nanoparticles, cyanide, hazardous waste
Health and environment
Mohsen Yazdani; Hosein Alidadi; Aliakbar Dehghan; Mojtaba Davoudi; Mahmood Dankoob; Mahmoud Taghavi; Reza Ataei; Aliasghar Navaei
Volume 26, Issue 1 , March and April 2019, , Pages 153-159
Abstract
Pistachio hull, a by-product of Pistachio processing, is a source of environmental pollution and can cause the health problems. Therefore, it must be treated by proper, sanitary and economical manners. One of the basic parameters for compost valuation is determine the amount of heavy metals. The objective ...
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Pistachio hull, a by-product of Pistachio processing, is a source of environmental pollution and can cause the health problems. Therefore, it must be treated by proper, sanitary and economical manners. One of the basic parameters for compost valuation is determine the amount of heavy metals. The objective of the present study was to determiner the concentration of heavy metals (pb, Cd, cr, Zn, Ni, Cu ) in the compost produced from mixed Pistachio Hull and livestock and Compare levels of heavy metals with the limits of international and internal standards.Material & Methods: This study is a descriptive cross-sectional that in sampling was two-stage in September 2014 and October 2015 A total from 2 composting pile , Compound sampling based ,26sample were selected. After digestion of the samples, the concentrations of metals( Pb ,Cd, Zn,Cr,Cu,Ni) by means of atomic absorption analysis and the concentration of a component in the sample based on mg / kg dw were reported.
Health and environment
Masoud Rismanchian; Karim Ebrahim; Zahra Ordudari
Volume 25, Issue 6 , November and December 2018, , Pages 749-762
Abstract
Abstract: Dispersive liquid-liquid microextraction (DLLME) is a recent microextraction technique that was first developed by Assadi and et al. in 2006. This method is a very popular and benign sample-preparation technique. Fast, cost benefit, easy and fast operation, low consumption of organic solvents, ...
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Abstract: Dispersive liquid-liquid microextraction (DLLME) is a recent microextraction technique that was first developed by Assadi and et al. in 2006. This method is a very popular and benign sample-preparation technique. Fast, cost benefit, easy and fast operation, low consumption of organic solvents, high enrichment factor and short extraction time are the advantages of this technique. Simultaneous extraction and preconcentration of analytes in to a micro-volume of extraction solvent is based on a ternary solvent system. Extraction solvent must be non polar, water immiscible and usually have higher density than water. Being polar and water miscible is often considered as a necessary feature for the disperser solvent. The present review study, aims at introducing basic principles of DLLME method, parameters affecting the extraction efficiency and finally evaluating the application of DLLME method in extraction hazardous material in work place. ...... ......... ..... ..... ..... ........ ........ .......... ........... ................ ..........
Health and environment
Ali Assadi; Ali Alizadeh; mehran Mohammad Fazl; Jalil Nassiri; jamshid Moshiri
Volume 25, Issue 6 , November and December 2018, , Pages 763-771
Abstract
Background: Due to the wide use of swimming pools and the necessity of maintaining the health of swimmers and controlling health issues, management and monitoring of such sites are necessary and necessary for compliance with established standards by competent authorities. The aim of this study was to ...
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Background: Due to the wide use of swimming pools and the necessity of maintaining the health of swimmers and controlling health issues, management and monitoring of such sites are necessary and necessary for compliance with established standards by competent authorities. The aim of this study was to evaluate the physicochemical and bacteriological indices of swimming pool water in Zanjan in 1995Materials and Methods: This study was descriptive-analytical and all of the active swimming pools were sampled during the summer and autumn seasons. Physical and chemical parameters such as air and water temperature, turbidity, residual free chlorine content, electrical conductivity, oxidation and regeneration potential (ORP) and bacteria including total coliforms and fecal coliforms, plate counting of heterotrophes, stool streptococci, Staphylococcus aureus and Pidmonas Aeroginosa was studiedResults: Among the microbial parameters of Pseudomonas aeruginosa and fecal coliforms, the plate count of heterotrophs was 64%, 26.9% and 12%, respectively, and were at an unsatisfactory level compared to the standard. This indicator was obtained for parameters of turbidity, water temperature, air, pH and free chlorine 98%, 94%, 88.9%, 79.6%, 41.7%, respectivelyConclusion: Physicochemical and bacterial parameters are in poor compliance with the national standard. Trainers instructors and managers of swimming pools are responsible for basically exploiting pools, implementing retraining courses for health inspectors, controlling routine operation and interventional parameters such as turbidity and temperature, and Effective on the disinfection process and the use of digital and up-to-date digital imaging devices has a significant impact on the water quality of the pools