Papers by Afshin Ebrahimi
International Journal of Environmental Health Engineering, 2012
ABSTRACT Aims: This study was conducted for degradation of 4-chlorophenol by microwave (MW) radia... more ABSTRACT Aims: This study was conducted for degradation of 4-chlorophenol by microwave (MW) radiations alone and in combination with hydrogen peroxide from aqueous solution. Materials and Methods: A modified domestic microwave oven was used alone and in combination with hydrogen peroxide for removing 4-chlorophenol. Furthermore, the influences of pH value, irradiation time, the power of MW radiations, and the initial concentration of 4-chlorophenol were studied. Results: It was shown that 4-chlorophenol removal efficiency extremely depend on the concentration of hydrogen peroxide, pH value, MW irradiation power and initial 4-chlorophenol concentration. The optimum conditions obtained for the best degradation rate were pH = 10.5, H 2 O 2 concentration of about 0.1 mol/l, and MW irradiation power of about 600 W. Other result shows that the best degradation rate of 4-chlorophenol was obtained when initial 4-chlorophenol concentration was 50 mg/l. Also the amount of the specific energy consumption in this method was 17460 kwh/kg of the removed organic compound. Conclusion: This result shows that MW irradiation in the presence of hydrogen peroxide can greatly enhance the degradation of 4-chlorophenol. However, the high consumption of energy for this method must be taken into consideration.
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Journal of Water and Wastewater; Ab va Fazilab ( in persian ), 2010
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International Journal of Preventive Medicine, 2015
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International Journal of Environmental Analytical Chemistry, Sep 18, 2020
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International Journal of Environmental Health Engineering, 2013
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International Journal of Environmental Health Engineering, 2013
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DESALINATION AND WATER TREATMENT, 2019
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Health Scope, Aug 3, 2016
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Ecotoxicology and Environmental Safety, Mar 1, 2021
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Journal of environmental health and sustainable development, Sep 15, 2016
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Environmental Research, Jun 1, 2023
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Iranian journal of health, safety and environment, Jan 7, 2016
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International Journal of Environmental Health Engineering, 2015
Aims: Feasibility of the anaerobic migrating blanket reactor (AMBR) was investigated for the trea... more Aims: Feasibility of the anaerobic migrating blanket reactor (AMBR) was investigated for the treatment of composting leachate. Materials and Methods: The AMBR consisted of a rectangular, plexiglas reactor (inside dimensions: length = 43 cm, height = 23.5 cm, width = 10 cm) with an active volume of 10 L. which divided reactor into four identical compartments (2.5 L). Composting leachate was used as a feed. Start-up of a reactor with diluted feed of approximately 10.43 g/L. Chemical oxygen demand (COD) was accomplished in about 44 weeks using seed sludge from the anaerobic digester of municipal wastewater treatment plant and operated continuously at mesophilic phase. The organic loading rates (OLRs) applied to the system was gradually increased from 1 to 19.65 g COD/L.d. Results: The reactor with hydraulic retention time of 10 day at 35C and initial OLR of 1 g COD/L.d showed 82.3% COD removal efficiency. The best performance of the reactor was observed with an OLR of 3.79 g COD/L.d. In influent of reactor, BOD 5 /COD ratio, TSS, VSS and TDS were ranged from 0.47 to 0.69, 1650 to 16,830, 990 to 12,622 and 2630 to 31,240 mg/L and in effluent of reactor were reached to 0.28 to 0.38, 660 to 7452, 346.5 to 4597 and 1860 to 19,490 mg/L, respectively. Conclusion: The AMBR could be an appealing option for pretreatment of organic load in composting leachate and improving the efficiency of the next biological reactors.
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تحقیقات نظام سلامت, May 8, 2012
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تحقیقات نظام سلامت, Jun 1, 2012
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International Journal of Environmental Health Engineering, 2014
Aims: The purpose of this study was to investigate the composition of dental waste coming from si... more Aims: The purpose of this study was to investigate the composition of dental waste coming from six dental health services in Isfahan, Iran. Materials and Methods: From 45 public dental clinics in Isfahan, six public dental health services were selected (three dental clinics and three dental centers). Waste collection took place from October to December 2011. During this period, three samples were collected from each dental clinic and were divided to pre-determined groups manually. Results: In dental centers, the amount of infectious, non-infectious and domestic-type waste accounting for 45.07%, 12.15% and 42.78%, respectively. Whereas in dental clinics the production rates of infectious, non-infectious and domestic-type waste accounting for 52.2%, 8.58% and 39.22%, respectively. Conclusion: Overall, according to the results it can be said that integration of infectious and hazardous waste with general waste leads to the amount of infectious waste appears much greater than it actually is. The collection and disposal of amalgam and other hazardous dental solid waste should be regulated as soon as possible and to decrease the costs of dental waste management the uncontaminated recyclable items, which contained approximately 33% of total dental waste should be recycled or reused if possible.
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Toxin Reviews
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Journal of Environmental Management, 2021
In the present work, effect of coexisting anions on the degradation performance of UV/chlorine (U... more In the present work, effect of coexisting anions on the degradation performance of UV/chlorine (UV/Cl) processes as an advanced oxidation treatment for the dye containing wastewater was investigated. The results showed that by increasing pH of the solution from 3 to 11, degradation efficiency of UV/Cl process was reduced from 96.2 ± 1.4% to 62.9 ± 3.1%. In the case of 100 mg/L of DR83:1, the removal efficiency was improved from 30.2 ± 1.5% to 93.3 ± 4.7% when the chlorine dose was increased from 100 to 1000 μM. The HCO₃- and Br- ions were the main inhibitor and promotor anions responsible for the degradation of DR83:1. The relative contribution of Cl• was higher than that for HO• and UV, which was about three-times higher than that for HO•. The lowest and highest amounts of trihalomethanes were generated at acidic and alkaline conditions as well as low disinfection by products at low pH due to the generation of more HO• radicals at acidic pH in comparison to higher pH such that less intermediates were remained to react with chlorine.
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Papers by Afshin Ebrahimi