Microcystin-LR attracts attention due to its high toxicity, high concentration and high frequency. The removal characteristics of UV/H2O2 and O3/H2O2 advanced oxidation processes and their individual process for MC-LR...Microcystin-LR attracts attention due to its high toxicity, high concentration and high frequency. The removal characteristics of UV/H2O2 and O3/H2O2 advanced oxidation processes and their individual process for MC-LR were investigated and compared in this study. Both the removal efficiencies and rates of MC-LR as well as the biotoxicity of degradation products was analyzed. Results showed that the UV/H2O2 process and O3/H2O2 were effective methods to remove MC-LR from water, and they two performed better than UV-, O3-, H2O2-alone processes under the same conditions. The effects of UV intensity, H2O2 concentration and O3 concentration on the removal perfomlance were explored. The synergistic effects between UV and H2O2, O3 and H2O2 were observed. UV dosage of 1800 mJ·cm^-2 was required to remove 90% of 100μg.L^-1 MC-LR, which amount significantly decreased to 500 mJ.cm^-2 when 1.7mg·L^-1 H2O2 was added. 0.25 mg.L^-1 O3, or 0.125 mg·L^-1 O9 with 1.7 mg·L^-1 H2O2 was needed to reach 90% removal efficiency. Furthermore, the biotoxicity results about these UV/H2O2, O3/H2O2 and O3-alone processes all present rising trends with oxidation degree of MC-LR. Biotoxicity of solution, equ valent to 0.01 mg·L^-1 Zn^2＋,ratsed to 0.05 mg.L Zn after UV/H2O2 or O3/H2O2 reaction. This phenomenon may be attributed to the aldehydes and ketones with small molecular weight generated during reaction. Advice about the selection of MC-LR removal methods in real cases was provided.展开更多
Introduction:Pharmaceuticals are regarded as emerging contaminants in the environment.In recent years,their destiny and removal have piqued people’s interest.Methods:Examine how well conventional wastewater treatment...Introduction:Pharmaceuticals are regarded as emerging contaminants in the environment.In recent years,their destiny and removal have piqued people’s interest.Methods:Examine how well conventional wastewater treatment facilities and cutting-edge technologies(ultrafiltration and reverse osmosis)can remove specific pharmaceutical compounds from water,with a focus on the compounds'environmental status,their origin,deterioration,metabolites,and the capacities of these facilities.Results and discussion:the ability and efficacy of sophisticated treatment technologies such as membrane separation,adsorption,and AOPs(Advanced Oxidation Processes)in eliminating chosen commonly used drugs from water are explored.Batch adsorption experiments were integrated with appropriate adsorption isotherms and appropriate kinetic models to predict the final extent of pollutant removal by this method.Continuous filtration mode was also investigated.Combining filtration(using AC(Activated Carbon)and micelle-clay granule complexes)with AOPs improves the economy of treating wastewater,which contains recalcitrant PhACs(Pharmaceutical Compounds).展开更多
文摘Microcystin-LR attracts attention due to its high toxicity, high concentration and high frequency. The removal characteristics of UV/H2O2 and O3/H2O2 advanced oxidation processes and their individual process for MC-LR were investigated and compared in this study. Both the removal efficiencies and rates of MC-LR as well as the biotoxicity of degradation products was analyzed. Results showed that the UV/H2O2 process and O3/H2O2 were effective methods to remove MC-LR from water, and they two performed better than UV-, O3-, H2O2-alone processes under the same conditions. The effects of UV intensity, H2O2 concentration and O3 concentration on the removal perfomlance were explored. The synergistic effects between UV and H2O2, O3 and H2O2 were observed. UV dosage of 1800 mJ·cm^-2 was required to remove 90% of 100μg.L^-1 MC-LR, which amount significantly decreased to 500 mJ.cm^-2 when 1.7mg·L^-1 H2O2 was added. 0.25 mg.L^-1 O3, or 0.125 mg·L^-1 O9 with 1.7 mg·L^-1 H2O2 was needed to reach 90% removal efficiency. Furthermore, the biotoxicity results about these UV/H2O2, O3/H2O2 and O3-alone processes all present rising trends with oxidation degree of MC-LR. Biotoxicity of solution, equ valent to 0.01 mg·L^-1 Zn^2＋,ratsed to 0.05 mg.L Zn after UV/H2O2 or O3/H2O2 reaction. This phenomenon may be attributed to the aldehydes and ketones with small molecular weight generated during reaction. Advice about the selection of MC-LR removal methods in real cases was provided.
文摘Introduction:Pharmaceuticals are regarded as emerging contaminants in the environment.In recent years,their destiny and removal have piqued people’s interest.Methods:Examine how well conventional wastewater treatment facilities and cutting-edge technologies(ultrafiltration and reverse osmosis)can remove specific pharmaceutical compounds from water,with a focus on the compounds'environmental status,their origin,deterioration,metabolites,and the capacities of these facilities.Results and discussion:the ability and efficacy of sophisticated treatment technologies such as membrane separation,adsorption,and AOPs(Advanced Oxidation Processes)in eliminating chosen commonly used drugs from water are explored.Batch adsorption experiments were integrated with appropriate adsorption isotherms and appropriate kinetic models to predict the final extent of pollutant removal by this method.Continuous filtration mode was also investigated.Combining filtration(using AC(Activated Carbon)and micelle-clay granule complexes)with AOPs improves the economy of treating wastewater,which contains recalcitrant PhACs(Pharmaceutical Compounds).
