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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Degradation Pathway of Benzothiazole and Microbial Community Structure in Microbial Electrolysis Cells
Author NameAffiliationPostcode
Xianshu Liu State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Jie Ding* State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Nanqi Ren State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Shuangyang Zhao State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Luyan Zhang State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Yan Li State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Qingyue Tong State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology 150000
Abstract:
In this study, benzothiazole was entirely mineralized by an up-flow internal circulation microbial electrolysis reactor. The bioelectrochemical system was operated at ambient temperature under continuous-flow mode. The analysis of metabolite which was extracted by HPLC-MS from the bioreactor indicated that benzothiazole derivative (BTH) was firstly converted into 2-hydroxybenzothiazole in the microbial electrolysis cell (MEC) and then mineralized within three steps, i.e., the fracture of thiazole-ring through a series of oxidation and hydrolysis, the deamination and hydroxylation of 2-aminobenzenesulfonic acid, and the mineralization of various carboxylic acids to CO2 and H2O. Bacterial community analysis indicated that the applied electric field could selectively enrich certain species and the dominate bacteria on the electrodes belonged to Proteobacteria, Bacteroidetes, and Firmicutes. Results show that MEC can improve the degradation efficiency of BTH in wastewater, enable the microbiological reactor to satisfy the requirements of high loading rate, thereby fulfilling the scale-up of whole process in the future.
Key words:  benzothiazole  microbial electrolysis cell  intermediate product  biodegradation pathway  high-throughput sequencing
DOI:10.11916/j.issn.1005-9113.18127
Clc Number:X703
Fund:
Descriptions in Chinese:
  本研究采用上流式内循环微生物电辅助反应器(UICMER)处理废水中苯并噻唑(BTH),实现了完全矿化,微生物电辅助系统在常温下采用连续流模式运行。通过HPLC-MS对微生物电辅助系统降解苯并噻唑的中间产物进行分析,结果表明,BTH首先转化为二羟基苯并噻唑(OHBT),而后通过三个步骤完成矿化反应:首先噻唑环通过一系列水解和氧化作用开环,其次通过脱氨基和羟基化反应生成2-氨基苯磺酸,最终各种小分子羧酸被矿化为CO2和H2O。 细菌群落结构分析表明,电场的存在有助于电极表面选择性地富集某些特定微生物种群,电极上的主要细菌类型属于变形菌,拟杆菌和厚壁菌。结果表明,MEC可有效提高废水中BTH的降解效率,使微生物反应器能够满足高负荷率的要求,可实现反应器经济高效运行。本研究可为MEC反应器的规模化应用提供理论基础。

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