Mehran Eyvazzadeh; MohammadHasan Rakhshani; Ayyob Rastegar; Ahmad Allahabadi; Ebrahim Manochehriyan; Fatemeh Dareyni; Abolfazl Rahmanisani
Volume 21, Issue 5 , September and October 2014, , Pages 934-941
Abstract
Background: In recent years, crisis of water shortage has become a serious problem in many countries. In this regard, the use of treated wastewater in natural or artificial method in agriculture and the like, has been proposed as an important and practical solution. The natural purification method by ...
Read More
Background: In recent years, crisis of water shortage has become a serious problem in many countries. In this regard, the use of treated wastewater in natural or artificial method in agriculture and the like, has been proposed as an important and practical solution. The natural purification method by the use of artificial canebrakes, compared with other methods of treatment is an appropriate method because of its low cost, and also, because of easy navigation, the requirements of low technology and low energy consumption. Several herbs have been used to increase the efficiency canebrakes which including special plants to purify such wastewater is Vetiveria that has unique genetic, morphological and physiological characteristics. Due to the limited knowledge of the plant's industrial wastewater treatment, in this study, a comparison of filterablity of hospital wastewater was done between Vetivaria and bulrush in tropical areas.
Methods: This experimental study was done in 2013 in the hot season, summer. In this study, was made two pilot glass with dimensions of 50*60*100 Cm. A mixture of soil, sand, gravel, clay soil was selected. The irrigation method in this study was subsurface and continuous. First, hospital wastewater via a 220 liter tank as the primary sedimentation retention time and with time of 2 hours entered into bed with a hydraulic retention time of 4 days to discharge 85/0 liters per hour. To evaluate the efficiency of each plant in the treatment of hospital wastewater, chemical parameters including (PH, TP, TN , TSS, BOD5, COD)were measured according to standard methods of measuring. . Analysis of the data was done by the use of t-test and Mann-Whitney and SPSS software.
Results :Based on the finding of this study, percentage of removal parameter(Bod5,Tss,Tn,Tp) by plant Vetiveria was (88.54,95.71,93.93,99.80) and for bulrush was (82.54,91.13,86.64,99.28).
Conclusion: Due to the unique characteristics of Vetiveria, such as high resistance against unfavorable environmental conditions and its higher efficiency than bulrush, this plant is recommended for the treatment of hospital wastewater.
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 ...
Read More
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