Health and environment
Mostafa Sobhanikia; Edris Bazrafshan; Hossein Kamani
Volume 24, Issue 2 , May and June 2017, , Pages 144-137
Abstract
Backgrounds and Objectives: Antibiotics can’t be removedefficiently by conventional wastewater treatment.Nano Zero Valent Iron (nZVI) has high efficiency of degradation of contaminants such as heavy metal, nitro aromatic compounds and insecticides. Ozonation is one of the most well known methods ...
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Backgrounds and Objectives: Antibiotics can’t be removedefficiently by conventional wastewater treatment.Nano Zero Valent Iron (nZVI) has high efficiency of degradation of contaminants such as heavy metal, nitro aromatic compounds and insecticides. Ozonation is one of the most well known methods for remove of chemichal-resistant materials like antibiotics of water and wastewater
Materials and Methods: This study is experimental. nZVI and ozonation were used to remove of penicillin G. for determination removal efficiency of penicillin, COD and TOC, factors: initial pH, dose of nano particle, initial penicillin dose, reaction time with nano particle and ozone were investigated.
Results: Removal efficiency of penicillin G, COD, TOC in stage of reaction with nZVI were 96.35%, 73.13% and 47.45%, respectivly with reaction time: 60 min, initial penicillin concentration: 100 mg/L, COD: 1429 mg/L, TOC: 510 mg/L, pH=7, nano particle iron concentration: 0.25 g/L. In the stage of reaction with ozone, removal efficiency of penicillin G, COD and TOC were 99.5%, 96.35% and 92.65%, respectivly with reaction time: 13 min, pH=9, initial penicillin 20 mg/l, COD: 356 mg/L, TOC: 136 mg/L, volumetric flow rate of ozone: 5 L/min.
Conclusion:The best removal efficiency in stage of nano particles reaction was in pH=7, initial nZVI concentration 0.25 g/L, initial penicillin concentration 100 mg/L and time about 60 min. The best removal efficiency in stage of ozonation was in pH=7 and time about 9 min.
Mohammadreza Samarghandi; Amir Shabanlou; Saba Majidi; Yosef PourEshgh; Jamal MehrAlipour
Volume 22, Issue 4 , September and October 2015, , Pages 639-648
Abstract
Background & Objectives: Electro-Ozonation process (EOP) has a good potential for the removal of persistent organic pollutants. This process is a combination of ozonation process and electricity for producing hydroxyl radical and removal of pollutants. The purpose of this study was to evaluate the ...
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Background & Objectives: Electro-Ozonation process (EOP) has a good potential for the removal of persistent organic pollutants. This process is a combination of ozonation process and electricity for producing hydroxyl radical and removal of pollutants. The purpose of this study was to evaluate the EOP for SDBS degradation in aqueous media. Materials & Methods: In this experimental study, a semi-batch reactor with four graphite electrodes of 120 cm2 area was used. The effects of pH (3-11), the inlet of ozone (6-30 mM / s), current density (16-85 mA/cm2), the initial concentration of SDBS (0.02-0.3 mM/L) and radical scavenger dose (0.2 mM/L) were studied.SDBS concentration measured by spectrophotometer (DR5000) by instructions provided in the standard method book. Results: The results indicate the high efficiency of this process in the removal of SBDS and COD. In optimum conditions of pH = 3, current 85 mA/cm2, ozone flow rate 30 mM/s and initial SDBS concentration 0.02 mM/L, more than 99% removal was observed in 50 min. By changing the parameters of the optimum conditions, the process performance was decreased. High efficiency of COD removal in this process was obtained in 80 min. Influence of TBA in solution was the efficiency decrease of process to 80 %. Conclusion: Electro-ozonation process as an advanced oxidation process can reduce organic pollution industry and can be considered as an environmentally friendly process.