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Mechanisms for simultaneous ozonation of sulfamethoxazole and natural organic matters in secondary effluent from sewage treatment plant

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 299-310页

作者： Xinshu Liu Xiaoman Su Sijie Tian Yue Li Rongfang Yuan Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Department of Environmental Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China

Sulfamethoxazole(SMX)is commonly detected in wastewater and cannot be completely decomposed during conventional treatment ***(O_(3))is often used in water *** study explored the influence of natural organic matters(NOM)in secondary effluent of a sewage treatment plant on the ozonation pathways of *** changes in NOM components during ozonation were also *** was primarily degraded by hydrolysis,isoxazole-ring opening,and double-bond addition,whereas hydroxylation was not the principal route given the low maximum abundances of the hydroxylated products,with m/z of 269 and *** hydroxylation process occurred mainly through indirect oxidation because the maximum abundances of the products reduced by about 70%after the radical quencher was added,whereas isoxazole-ring opening and double-bond addition processes mainly depended on direct oxidation,which was unaffected by the *** mainly affected the degradation of micropollutants by consuming•OH rather than O_(3)molecules,resulting in the 63%–85%decrease in indirect oxidation *** NOM in the effluent were also degraded simultaneously during ozonation,and the components with larger aromaticity were more likely degraded through direct *** dependences of the three main components of NOM in the effluent on indirect oxidation followed the sequence:humic-like substances>fluvic-like substance-s>protein-like *** study reveals the ozonation mechanism of SMX in secondary effluent and provides a theoretical basis for the control of SMX and its degradation products in actual water treatment.

关键词： Sulfamethoxazole Ozonation natural organic matters Secondary effluent Degradation mechanism

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Effects of nature organic matters and hydrated metal oxides on the anaerobic degradation of lindane,p,p'-DDT and HCB in sediments

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Journal of Environmental Sciences 2003年第5期15卷 618-621页

作者： ZHAO Xu QUAN Xie ZHAO Hui min CHEN Jing wen CHEN Shou ZHAO Ya zhi School of Environmental Science and Technology Dalian University of TechnologyDalian 116012China.

Effects of natural organic matters(NOM) and hydrated metal oxides(HMO) in sediments on the anaerobic degradation of γ 666, p,p' DDT and HCB were investigated by means of removing NOM and HMO in Liaohe River sediments sequentially. The results showed that the anaerobic degradation of γ 666, p,p' DDT and HCB followed pseudo first order kinetics in different sediments. But, the extents and rates of degradation were different, even the other conditions remained the same. Anaerobic degradation rates of γ 666, p,p' DDT and HCB were 0 020 d -1 , 0 009 d -1 and 0 035 month -1 respectively for the sediments without additional carbon resources. However, with addition of carbon resources, the anaerobic degradation rates of γ 666, p, p ' DDT and HCB were 0 071 d -1 , 0 054 d -1 and 0 088 month -1 in the original sediments respectively. After removing NOM, the rates were decreased to 0 047 d -1 , 0 037 d -1 and 0 066 month -1 ; in the sediments removed NOM and HMO, the rates were increased to 0 067 d -1 , 0 059 d -1 and 0 086 month -1 . These results indicated that NOM in the sediments accelerated the anaerobic degradation of γ 666, p,p' DDT and HCB; the HMO inhibited the anaerobic degradation of γ 666, p,p' DDT and HCB.

关键词： lindane p,p' DDT HCB anaerobic degradation sediments natural organic matters

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Application of Fe^Ⅲ-TAML/H2O_(2) system for treatment of fluoroquinolone antibiotics

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Journal of Environmental Sciences 2021年第1期33卷 110-118页

作者： Zeyu Xian Sijia Liang Xin Jin Haoting Tian Jingyi Ling Chao Wang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanijing UniversityNanjing 210023China Shandong Prouincial Key Laboratory of Water and Soil Conservation and Enuironmental Protection College of Resource and EnvironmentLinyi UniversityLinyi 276005China

Over the recent past,fluoroquinolone antibiotics(FQs)have raised extensive attention due to their potential to induce the formation of resistance genes and"superbugs",thus various advanced oxidation techniques have been developed to eliminate their release into the *** the present study,the prototype tetraamido macrocyclic ligand(Fe^Ⅲ-TAML)/hydrogen peroxide(H2O_(2))system is employed to degrade FQs(i.e.,norfloxacin and ciprofloxacin)over a wide p H range(i.e.,p H 6-10),and the reaction rate increases with the increase in p H *** effect of dosage of Fe^Ⅲ-TAML and H2O_(2) on the degradation of FQs is evaluated,and the reaction rate is linearly correlated with the added amount of ***,the impact of natural organic matters(NOM)on the removal of FQs is investigated,and the degradation kinetics show that both NOM type and experimental concentration exhibit negligible influence on the oxidative degradation of selected *** on the results of liquid chromatography-high resolution mass spectrometry and theoretical calculations,the reaction sites and pathways of FQs by Fe^Ⅲ-TAML/H2O_(2) system are further predicted and elucidated.

关键词： Fluoroquinolone antibiotics Tetraamido macrocyclic ligand Catalytic degradation natural organic matters

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Effects of a dynamic membrane formed with polyethylene glycol on the ultrafiltration of natural organic matter

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Frontiers of Environmental Science & Engineering 2010年第2期4卷 172-182页

作者： Boksoon KWON Noeon PARK Jaeweon CHO Woongjin R&D Center San 4-1Nakseongdae-dongGwanak-guSeoul 151-057Korea Korea Institute of S&T Evaluation and Planning Yangjae-dongSeocho-guSeoul 137-130Korea Department of Environmental Science and Engineering GIST1 Oryong-dongBuk-guGwangju 500-712Korea

The formation of a dynamic membrane(DM)was investigated using polyethylene glycol(PEG)(molecular weight of 35000 g/mol,concentration of 1 g/L).Two natural organic matters(NOM),Dongbok Lake NOM(DLNOM)and Suwannee River NOM(SRNOM)were used in the ultrafiltration experiments along with *** evaluate the effects of the DM with PEG on ultrafiltration,various transport experiments were conducted,and the analyses of the NOM in the membrane feed and permeate were performed using high performance size exclusion chromatography,and the effective pore size distribution(effective PSD)and effective molecular weight cut off(effective MWCO)were *** advantages of DM formed with PEG can be summarized as follows:(1)PEG interferes with NOM transmission through the ultrafiltration membrane pores by increasing the retention coefficient of NOM in UF membranes,and(2)low removal of NOM by the DM is affected by external factors,such as pressure increases during UF membrane filtration,which decreases the effective PSD and effective MWCO of UF ***,a disadvantage of the DM with PEG was severe flux decline;thus,one must be mindful of both the positive and negative influences of the DM when optimizing the UF performance of the membrane.

关键词： dynamic membrane natural organic matters ultrafiltration membrane performance effective PSD effective molecular weight cutoff

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