铁氧化物介导厌氧生物强化降解对硝基氯苯  

Enhancing Anaerobic Biodegradation of p-Nitrochlorobenzence Mediated by Iron Oxide Compounds

作　　者：欧昌进[1] 钱卢雯 张峻通 郑怡青 黄陈辉 郭宏杰 石健[2] OU Changjin;QIAN Luwen;ZHANG Juntong;ZHENG Yiqing;HUANG Chenhui;GUO Hongjie;SHI Jian(School of Chemistry and Chemical Engineering,Nantong University,Nantong 226019,China;Center for Analysis and Testing,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学化学化工学院,江苏南通226019 [2]南通大学分析测试中心,江苏南通226019

出　　处：《南通大学学报（自然科学版）》2019年第3期40-46,共7页Journal of Nantong University(Natural Science Edition)　

基　　金：国家自然科学基金项目(51708302);江苏省高校自然科学研究面上项目(17KJB610008)

摘　　要：针对采用传统厌氧生物技术处理含硝基芳香族化合物(NACs)废水时存在降解速率低、系统稳定性差和运行成本高等问题,以α-Fe2O3为电子传递介体与厌氧生物系统进行耦合,探究其降解以对硝基氯苯(4-CNB)为代表的NACs的效果,并阐述耦合作用机制。初始质量浓度为45 mg/L 的4-CNB在耦合系统内反应56 h后,其残留质量浓度为(3.24±0.13) mg/L,而在厌氧生物对照系统和α-Fe2O3对照系统中分别为(15.47±0.43)mg/L和(44.48±0.01)mg/L,表明α-Fe2O3的投加对厌氧生物降解4-CNB具有显著的强化作用。4-CNB在耦合系统内的降解效率与α-Fe2O3的投加量在1~3 g/L范围内呈现显著的正相关,当α-Fe2O3的投加量为5 g/L时,其对厌氧微生物产生较强的抑制作用。相比于厌氧对照系统,4-CNB在耦合系统内的降解更符合一级动力学,进一步验证了α-Fe2O3与厌氧微生物之间在降解4-CNB过程中具有一定的协同效应。此外,α-Fe2O3的投加可显著降低厌氧生物系统内的氧化还原电位(ORP)和增强pH自缓冲能力,这些均有利于4-CNB的还原降解。电子传递体系 (ETS) 活性在耦合系统和厌氧生物对照系统中分别为48.77 μg/(g·min)和32.19 μg/(g·min),进一步表明了α-Fe2O3可作为厌氧还原4-CNB过程的电子传递介质。综上所述,采用α-Fe2O3作为电子传递介质可以强化厌氧微生物的还原活性,可为实现含NACs废水的大规模处理提供新的技术储备。The traditional anaerobic biological technology for wastewater containing nitroaromatic compounds (NACs) treatment is generally limited by various drawbacks such as slow degradation rate,poor system stability and high operating cost.To address above issues,α-Fe2O3 as the electron transfer mediator is coupled into anaerobic system,and its effects on degradation of NACs represented by p-nitrochlorobenzene (4-CNB) is systematically investigated.In addition,the coupling mechanism between α-Fe2O3 and anaerobic microorganism is revealed.The results show that the removal efficiency of 4-CNB with initial concentration of 45 mg/L in the coupled system after 56 h reaction is (3.24±0.13)mg/L,while its in the anaerobic control system and the α-Fe2O3 control system are corresponding to (15.47±0.43)mg/L and (44.48±0.01)mg/L,respectively.The above results indicate that 4-CNB anaerobic reduction is significantly accelerated with addition of α-Fe2O3.In addition,the 4-CNB degradation efficiency in the coupled system presented a positive correlation with α-Fe2O3 between 1 and 3 g/L.When the addition amount of α-Fe2O3 is 5 g/L,it has a strong inhibitory effect on anaerobic microorganisms.Compared with anaerobic control system,4-CNB degradation kinetics in the coupled system is more fitted to pseudo-first-order kinetics,which further verifies that there has some synergistic effect between α-Fe2O3 and microorganisms in 4-CNB degradation process.The increased 4-CNB removal in the coupled system is linked to the low oxidation-reduction potential (ORP) and great pH self-buffering capability,which is provided by the addition of magnetite α-Fe2O3.The electronic transfer system (ETS) in the coupled system and anaerobic control system is 48.77 μg/(g·min) and 32.19 μg/(g·min),respectively,indicating that α-Fe2O3 can be used as the electron transport mediator in the anaerobic reduction 4-CNB process.In conclusion,using α-Fe2O3 as the electron transfer mediator can enhance the reducing activity of anaerobic microorganisms and p

关 键 词：对硝基氯苯 Α-FE2O3 厌氧还原 耦合机制 

分 类 号：X703.1[环境科学与工程—环境工程]