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.
Abdolmotalleb Seyyed Mohammadi; Ghorban Asgari; MohammadTaghi Samadi; Ali Pour Mohammadi; Ali Faramarzi Govhar
Volume 22, Issue 4 , September and October 2015, , Pages 571-580
Abstract
Background and aim: Humic Acid (HA) is one of the polyelectrolyte compounds which cause many problems in water treatment process. In present study, UV/IO4- as a novel advance oxidation process, was used for removing HA. Material and methods: In present research, a batch reactor in lab scale was used.This ...
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Background and aim: Humic Acid (HA) is one of the polyelectrolyte compounds which cause many problems in water treatment process. In present study, UV/IO4- as a novel advance oxidation process, was used for removing HA. Material and methods: In present research, a batch reactor in lab scale was used.This reactor with useful volume of 2.5 L, made of stainless steel, which equipped with a low pressure Hg vapor lamp. In this study the effect of some parameters including pH, initial HA concentration, IO4- concentration and Fe (0) nanoparticles concentration were investigated. HA concentration was determined using Spectrophotometer at an absorbance wavelength of 254 nm. Results: According to the results, pH 3, periodate concentration 125 mg/L and Fe (0) Nano particles 12.5 mg/L were determined as optimum conditions. Moreover, results indicated that in presence of UV coupled with Periodate removal efficiency of HA increased to 66.08%, and the increase of Fe (0) Nano particles can led to increase HA removal (73.3%). Conclusion: Results show thatthe presence of UV letto increase in the activation of periodate, on the other hands, the presence of Fe (0) Nano particles led to further activation of periodate subsequently cause the increasing HA removal.