可见光光催化-生物法直接耦合降解环丙沙星废水的行为及生物响应机制  

DEGRADATION BEHAVIOR AND BIOLOGICAL RESPONSE OF CIPROFLOXACIN WASTEWATER BY INTIMATELY COUPLED PHOTOCATALYSIS AND BIODEGRADATION

作　　者：张智博 董怡琳 李静超 陈昕雨 任芝军 ZHANG Zhibo;DONG Yilin;LI Jingchao;CHEN Xinyu;REN Zhijun(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《环境工程》2023年第4期18-25,共8页Environmental Engineering

基　　金：国家自然科学基金资助项目(51779068);河北省自然科学基金资助项目(B2019202078);河北省高校科技攻关项目(ZD2020149)。

摘　　要：考察了光催化-生物降解直接耦合体系(ICPB)对环丙沙星(CIP)的降解行为,着重探讨了不同反应条件对ICPB体系降解CIP效率的影响及ICPB中生物响应与关键作用。结果表明:ICPB反应体系中,载体投加量为30%,光照强度为50 klux,反应初始pH值为7,ρ(DO)为5~6 mg/L时,CIP去除效果最佳,并可在较宽CIP浓度范围内(5~30 mg/L)具有较高的去除率,且其降解效率(90%)明显优于单独光催化(80%)和单独生物降解(50%)。生物膜观察结果阐明,ICPB载体内部生物膜未受到显著伤害,并且微生物通过利用CIP光催化氧化形成的小分子中间产物存活并对这些产物进行进一步生物降解,从而达到完全矿化。ICPB中生物膜通过Ferruginibacter、Clostridium、Stenotrophomonas和Comamonas等菌属的富集来适应环境胁迫,同时生物群落结构的演替对于微生物存活有着重要意义。The degradation behavior of ciprofloxacin(CIP)by intimately coupled photocatalysis and biodegradation system(ICPB)was investigated in this study.The effects of different reaction conditions on the degradation efficiency of CIP by ICPB system and the response and key role of organisms in ICPB were discussed.The results showed that the best CIP removal effect was achieved in the ICPB reaction system with a carrier dosage of 30%,a light intensity of 50 klux,an initial pH of 7 and a dissolved oxygen concentration of 5 to 6 mg/L,and a high removal efficiency could be kept in a wide range of initial CIP concentrations(5 to 30 mg/L),and the degradation efficiency(90%)was significantly better than that of photocatalysis alone(80%)and biodegradation alone(50%).The biofilm observation result clarified that biofilms inside the carriers of ICPB were not significantly damaged,and microorganisms survived by using the small molecule intermediates formed by the photocatalytic oxidation of CIP and,further biodegraded these products to achieve complete mineralization.The biofilms in ICPB adapt to environmental stress through the enrichment of Ferruginibacter,Clostridium,Stenotrophomonas and Comamonas,and the succession of the community structure was of great importance for the survival of microorganisms.

关 键 词：光催化-生物法直接耦合 环丙沙星废水 降解行为 降解途径 生物响应 

分 类 号：X703[环境科学与工程—环境工程]