上流式生物电化学系统深化处理2-氯硝基苯废水
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摘要
构建了多组上流式生物电化学反应系统(up-flow bio-electrochemical system,简称UBES),研究了UBES降解2-氯硝基苯(2-CNB)废水的特性,探究了2-CNB在UBES中降解的影响因素和降解途径.实验结果表明:在一定范围内增大外加电压,2-CNB在UBES系统中降解速率与电压值呈正相关,当外加电压超过某一范围时,2-CNB降解速率下降.中性条件下,当2-CNB初始浓度为20 mg·L~(-1),外加电压为1.4 V反应30 h后,2-CNB的降解率达到99.61%;采用HPLC、HPLC/MS、HPLC/MS/MS及IC技术,分析了2-CNB降解24 h的中间产物,结果表明:2-CNB在降解过程中将产生苯胺、2-氯苯酚、苯二酚、2-氯苯胺、2-氯亚硝基苯、2-氯羟基苯胺、正己酸、丁二酸等中间产物,部分Cl元素和N元素分别转化为Cl~-和NO~-_3.2-CNB在UBES系统中降解包含阴极还原、阳极氧化两种降解途径.
Multiple groups of up-flow bio-electrochemical system(abbreviation UBES) have been constructed, the characters of 2-CNB waste water degradation by UBES, the influential factor of the degradation process, as well as 2-CNB degradation patheay in UBES have been studied. The results show that 2-CNB degradation rate in the system was positively correlated with the voltage value in a certain range, When the external voltage exceeded a certain limit, the rate of degradation reduced promptly. Under the neutral situation, when the initial concentration of 2-CNB was 20 mg·L~(-1), external voltage was 1.4 V and the react time was 30 h, the removal rate of 2-CNB reached 99.61%. The intermediates after degraded for 24 hours were analized by HPLC/MS and HPLC/MS/MS and IC, which showed that aniline, 2-chlorophenol, catechol, 2-chloroaniline, 2-chloro-nitrobenzene, 2-chloro-hydroxy aniline, n-adipic acid, succinic acid were produced in the course of decomposition and part of Cl and N turned into Cl~- and NO~-_3. 2-CNB has two decomposition pathways in the system cathode reduction and anodic oxidation.
Multiple groups of up-flow bio-electrochemical system(abbreviation UBES) have been constructed, the characters of 2-CNB waste water degradation by UBES, the influential factor of the degradation process, as well as 2-CNB degradation patheay in UBES have been studied. The results show that 2-CNB degradation rate in the system was positively correlated with the voltage value in a certain range, When the external voltage exceeded a certain limit, the rate of degradation reduced promptly. Under the neutral situation, when the initial concentration of 2-CNB was 20 mg·L~(-1), external voltage was 1.4 V and the react time was 30 h, the removal rate of 2-CNB reached 99.61%. The intermediates after degraded for 24 hours were analized by HPLC/MS and HPLC/MS/MS and IC, which showed that aniline, 2-chlorophenol, catechol, 2-chloroaniline, 2-chloro-nitrobenzene, 2-chloro-hydroxy aniline, n-adipic acid, succinic acid were produced in the course of decomposition and part of Cl and N turned into Cl~- and NO~-_3. 2-CNB has two decomposition pathways in the system cathode reduction and anodic oxidation.
引文
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李明堂, 徐镜波, 卢振兰,等. 2010.两株细菌对邻氯硝基苯的协同降解[J]. 环境科学学报,30(6):1138-1143
廖娣劼, 杨琦, 李俊錡. 2012.零价铁降解4-氯硝基苯动力学研究[J]. 环境科学, 33(2):469-475
Wang A J, Cheng H Y, Liang B, et al.2011. Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode[J]. Environmental Science & Technology, 45(23):10186-10193
Xu X, Shao J, Li M, et al.2016. Reductive Transformation of p-chloronitrobenzene in the upflow anaerobic sludge blanket reactor coupled with microbial electrolysis cell: performance and microbial community[J]. Bioresource Technology, 218:1037
Zhu L, Gao K, Qi J, et al.2014. Enhanced reductive transformation of p-chloronitrobenzene in a novel bioelectrode-UASB coupled system[J]. Bioresource Technology, 167(3):303-309
Zhu L, Lin H Z, Qi J Q, et al. 2012. Effect of H2 on reductive transformation of p-ClNB in a combined ZVI-anaerobic sludge system.[J]. Water Research, 46(19):6291-6299
张一帆, 王爱杰, 程浩毅. 2017.生物电化学系统在废水脱氮中的应用研究进展[J]. 水处理技术, 43(10):54-59
Chen H, Gao X, Wang C, et al.2017.Efficient 2,4-dichloronitrobenzene removal in the coupled BES-UASB reactor: Effect of external voltage mode[J]. Bioresource Technology, 241:879
陈宜菲, 陈少瑾. 2007.利用零价铁还原土壤中硝基苯类化合物的研究[J].环境科学学报,27(2):241-246
程浩毅.2009.利用生物电化学系统(BES)去除废水中硝基苯的可行性研究[D].哈尔滨:哈尔滨工业大学
高凯拓, 华立锋, 陶丽杰,等.2016.微生物电解池原理及其在废水处理中的研究进展[J]. 能源环境保护, 30(4):1-4
何伟华, 刘佳, 王海曼,等.2017.微生物电化学污水处理技术的优势与挑战[J].电化学,23(3):283-296
Jiang X, Shen J, Yan H, et al.2016. Efficient nitro reduction and dechlorination of 2,4-dinitrochlorobenzene through the integration of bioelectrochemical system into upflow anaerobic sludge blanket: A comprehensive study[J]. Water Research, 88:257-265
蒋沁芮, 杨暖, 吴亭亭,等. 2018.生物电化学脱氮技术研究进展[J]. 应用与环境生物学报, 24(2):1-13
Li B, Zhu J. 2014.Removal of p-chloronitrobenzene from groundwater: Effectiveness and degradation mechanism of a heterogeneous nanoparticulate zero-valent iron (NZVI)-induced Fenton process[J]. Chemical Engineering Journal, 255(7):225-232
李炳智, 徐向阳, 朱亮.2008. 氯代硝基苯类废水臭氧化动力学和机理[J]. 化工学报, 59(8):2111-2120
李海翔, 徐晓茵, 梁郡,等.2012. 氢基质自养微生物还原降解水中对氯硝基苯的研究[J]. 环境科学学报, 32(10):2394-2401
李明堂, 徐镜波, 卢振兰,等. 2010.两株细菌对邻氯硝基苯的协同降解[J]. 环境科学学报,30(6):1138-1143
廖娣劼, 杨琦, 李俊錡. 2012.零价铁降解4-氯硝基苯动力学研究[J]. 环境科学, 33(2):469-475
Wang A J, Cheng H Y, Liang B, et al.2011. Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode[J]. Environmental Science & Technology, 45(23):10186-10193
Xu X, Shao J, Li M, et al.2016. Reductive Transformation of p-chloronitrobenzene in the upflow anaerobic sludge blanket reactor coupled with microbial electrolysis cell: performance and microbial community[J]. Bioresource Technology, 218:1037
Zhu L, Gao K, Qi J, et al.2014. Enhanced reductive transformation of p-chloronitrobenzene in a novel bioelectrode-UASB coupled system[J]. Bioresource Technology, 167(3):303-309
Zhu L, Lin H Z, Qi J Q, et al. 2012. Effect of H2 on reductive transformation of p-ClNB in a combined ZVI-anaerobic sludge system.[J]. Water Research, 46(19):6291-6299
张一帆, 王爱杰, 程浩毅. 2017.生物电化学系统在废水脱氮中的应用研究进展[J]. 水处理技术, 43(10):54-59
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