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
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
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
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
Sohrab Golmohammadi; Abdol Azim Alinejad; Afshin Ghaderpoury; Nezam Mirzaei; Mohammad Hossien Saghi; Mansour Ghaderpoori
Volume 23, Issue 4 , September and October 2016, , Pages 680-687
Abstract
Background Wastewater from textile dyes, which contain organic pollutants, is a major source of environmental contamination. This study aimed to determine the efficiency of the photo-catalytic process of ZnO nanoparticles in removing Acid Black 1 from aqueous solutions.Methods & Materials This study ...
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Background Wastewater from textile dyes, which contain organic pollutants, is a major source of environmental contamination. This study aimed to determine the efficiency of the photo-catalytic process of ZnO nanoparticles in removing Acid Black 1 from aqueous solutions.Methods & Materials This study was quasi-experimental. The nanoparticles were synthesized in the laboratory. To determine their characteristics some tests, including SEM, XRD and particle size distribution were done. The optimum pH was determined in the test, then, by maintaining the optimum pH, hydrogen peroxide concentration, dye concentration and different concentrations of nanoparticles were studied.Results The results showed that the removal efficiency of this process is maximum at pH=4 and equals to 1.15%. The best color removal efficiency was obtained at a concentration of 5 mg/l. The maximum and minimum removal efficiency as a color block acid were obtained at a concentration of 30 and 5 Mmol/mL of hydrogen peroxide, respectively.Conclusion Nano-photo catalytic process is a highly efficient method for the removal of dyes in aqueous solutions. In this process, organic materials are converted into less toxic substances also the energy of sunlight, which is used in this process is normally available
AliAsghar Khajevand; Esmaeil Zarei; Hossein Fallah; Masoud Matlabi Kashani; Vali Sarsangi; Mohammadhossein Saghi; Aziz Rahimizadeh
Volume 20, Issue 5 , March and April 2014, , Pages 706-715
Abstract
Background and aim: Due to the high production rate and the manual nature of the manufacturing of Arc opal dishes the probability of the musculoskeletal disorder onset is high. The aim of present study was to detect and assess the risk of musculoskeletal disorders and its relation to the work pace among ...
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Background and aim: Due to the high production rate and the manual nature of the manufacturing of Arc opal dishes the probability of the musculoskeletal disorder onset is high. The aim of present study was to detect and assess the risk of musculoskeletal disorders and its relation to the work pace among the staffs in one of the dishes manufacturing companies.
Materials & Methods: This cross-sectional descriptive-analytical study was carried out on the 100 staffs employed on the decoration section of the company that had job experience equal to one year. They was selected randomly. . To detect the disorders in different parts of the body and to assess the risk of MSDs were used Nordic questionnaireand QEC method respectively. Using SPSS15 software, we analyzed data that used one way ANOVA and Independent Sample t- test.
Results: The results from Nordic questionnaire revealed that the most prevalent disorders in past year related to back (93%), neck(89%), and shoulder(82%) regions respectively. The QEC showed that level of worker exposure with risk factors in back(53%), shoulder(58%), Wrist – Hand(71%) and neck(58%) regions is high. Also 71 percent of worker employees have inappropriate posture during work. A significant relation was found between the MSDs and the work pace.
Conclusion: Considering the high prevalence of MSD and analyzing the related risk factors which signifying the risky condition of work environment, it proposed to apply the ergonomic intervention for reduction of work pace.
Fatemeh Dareyni; Seyyedeh Azam Amini Mohammadiyeh; Hamidreza Zare Sani; MohammadHoseein Saghi
Volume 20, Issue 5 , March and April 2014, , Pages 782-790
Abstract
Background: Discharge of colored sewages, resulting from domestic and industrial wastewaters, results in eutrophication, coloring and hypoxia of waters. Furthermore, colors have mutagenic and carcinogenic effects. This study aimed to investigate the removal rate of acid black 1 dye from aqueous solution ...
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Background: Discharge of colored sewages, resulting from domestic and industrial wastewaters, results in eutrophication, coloring and hypoxia of waters. Furthermore, colors have mutagenic and carcinogenic effects. This study aimed to investigate the removal rate of acid black 1 dye from aqueous solution using
nano-iron particles.
Materials and methods: This study was done experimentally and discontinuously in lab scale. The effect of variables such as contact duration (30, 60, 90, 120, 150 and 180 min), pH (3, 7 and 11), adsorbent dose (0.4, 0.8, 1.2 and 1.6 g/200ml) and dye concentration (50, 150 and 200 mg/l) were evaluated on the removal rate of dye from aqueous solution. The data were analyzed using Excel software.
Results: The results showed that with increase in contact duration, the removal efficiency of dye also increased from 92.85 percent to 99.17 percent. Also, the increase in adsorbent concentration resulted in increase in removal efficiency of dye from 62.11 percent to 99.1 percent. A decrease in pH and dye concentration also increased removal efficiency of dye from 53.71 percent to 99 percent, and from 99.97 to 100 percent, respectively. The results of isothermal study showed that the removal of acid black 1 dye from aqueous solution follows from the Langmuir equation (0.999
Akbar Ahmadi Asour; Mohammad Hossein Saghi; Ramezanali Khamirchi; Tahereh Vaziri; Ayyob Rastegar
Volume 20, Issue 2 , May and June 2013, , Pages 222-229
Abstract
Introduction: Unnecessary use of chemical manure in order to increase the crop production, particularly in the agricultural sector, causes environmental damages and disorder in terms of soil fertility. In the manure preparation method through the biogas, organic manure of high quality can be produced ...
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Introduction: Unnecessary use of chemical manure in order to increase the crop production, particularly in the agricultural sector, causes environmental damages and disorder in terms of soil fertility. In the manure preparation method through the biogas, organic manure of high quality can be produced in addition to obtaining gas. The purpose of this study is to examine the physical as well as chemical properties of the manure produced by the combined wastes of livestock and poultry using biogas system.
Research method: In order to put the pilot project into operation, livestock and poultry wastes were primarily collected and were added to the planned pilot in a proportional ratio of 1:2. After about two months, the produced gas was measured and the parameters of the manure were analyzed according to the pilot sample and subsequently, they were compared with the existing standards. Using EXCEL, the gathered data were analyzed.
Results: PH rate obtained from the manure was estimated to be 7.2. Reportedly, the electrical conductivity of the sample was equal to 29.53 ml. Siemens/cm. and the humidity was 5%. The organic compounds in the sample were 8.19% and ash was 8.58%. Furthermore, the rate of the organic carbon for the sample was 40% and the size of the uniformed particles was of the highest mesh, i.e. 50. The manure obtained has a phosphorous concentration of 1 mg/l and the sodium concentration obtained were 94 mg/l and potassium 74 mg/l.
Discussion and conclusion: Findings indicate that the rate of organic materials, phosphorus, ash and organic carbon are consistent with the standards set by WHO. With regard to low cost, availability, being danger-free and enriched as well as the simultaneous use of the gas produced, the manure obtained through the biogas can be considered a suitable kind of manure for agriculture.
Tahereh Vazeiri; Abolfaz Rahmani Sani; Ahmad Allahabadi; MohammadHossein Saghi; Reza Hekmatshoar
Volume 19, Issue 2 , May and June 2012, , Pages 127-135
Abstract
Background: The biosorption process has found numerous applications due to low cost, availability, biosorbent reuse, and utilization of excess sludge from wastewater treatment facilities. The aim of the present study was to evaluate the efficiency of dried activated sludge in removing Reactive Orange ...
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Background: The biosorption process has found numerous applications due to low cost, availability, biosorbent reuse, and utilization of excess sludge from wastewater treatment facilities. The aim of the present study was to evaluate the efficiency of dried activated sludge in removing Reactive Orange 3R dye. Materials and methods: For this experimental, laboratory study, dye solutions were prepared in three concentrations: 50, 100, and 150 mg/L. The solutions were then subjected to adsorbent in weights 0.2, 0.4, 0.6, 0.8, and 1.0 g for various durations (0.5, 1, 1.5, 2, 2.5, and 3 hours) in different pH levels (4, 7, and 12). Data was analyzed using Excel software. Results: Increasing contact time from 0.5h to 3h, the dye removal efficiency increased from 56% to 76%. When the weight of the biomass increased from 0.2g to 0.8g, the dye removal efficiency increased from 58% to 72%. High initial iron concentration had an adverse effect on iron removal efficiency. Increasing initial dye concentration from 50 to 150 mg/L decreased iron removal efficiency from 71% to 62%. Freundlich isotherm models could describe the adsorption equilibrium of the dye onto the activated sludge. Freundlich isotherm represented a better correlation compared to other isotherms (R2>0.952). Also, second-order models fit well with experimental data (R2>0.979). Conclusion: This technology for dye removal from industrial wastewater, in addition to the optimal use of biomass from wastewater, can help resolve the environmental problem of wastewater dye excretion.