复合钛网生物膜电极反应器处理低C/N污水脱氮性能及机理研究  

Research on nitrogen removal performance and mechanism of multi titaniummesh biofilm electrode reactor for treating low C/N wastewater

作　　者：于晓倩 崔申申 付政 宋新山[1] 王宇晖[1] YU Xiaoqian;CUI Shenshen;FU Zheng;SONG Xinshan;WANG Yuhui(College of Environmental Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《环境科学学报》2024年第7期14-25,共12页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划专题项目(No.2021YFC3000102);上海市农业科技创新项目(No.I2023004)。

摘　　要：本研究在金属钛网间填充无机纤维棉形成多层电极组件,构建了一种新型复合钛网生物膜电极反应器(Multi Titanium-mesh Biofilm Electrode Reactor,MTBER)用于低碳氮比(C/N)污水的脱氮处理,并探究了电流密度、进水C/N、总氮负荷及水力停留时间(HRT)对MTBER脱氮性能的影响.结果表明,总氮去除最佳电流密度范围为250~350 m A·m^(-2),适宜进水总氮浓度为60~75 mg·L^(-1),最佳水力停留时间为12~16 h.当C/N=1,进水总氮浓度=75 mg·L^(-1),电流密度=250 m A·m^(-2),HRT=12 h时,NO_(3)^(-)-N、NH_(4)^(+)-N和TN的去除率与未通电时相比分别提高了29.67%、30.30%和26.83%.MTBER对TN的脱除机制主要是在电化学氧化还原作用条件下,体系硝化、异养及氢自养协同反硝化的共同结果.In this study,a novel multi titanium-mesh biofilm electrode reactor (MTBER) was invented for low carbon to nitrogen ratio (C/N) wastewater nitrogen removal.The MTBER consists of electrode assemblies made of stacked titanium mesh layers stuffed with inorganic fiber.The effects of current density,influent C/N,total nitrogen loading,and hydraulic retention time (HRT) on the nitrogen removal efficiency of MTBER were investigated.Results showed that current density range of 250~350 m A·m^(-2),influent total nitrogen concentration of 60~75 mg·L^(-1),and hydraulic retention time of 12~16 h are the suitable conditions for total nitrogen removal.Compared to the non-electrified trials,the removal of NO_(3)^(-)-N,NH_(4)^(+)-N and TN respectively increased by 29.67%,30.30%and 26.83%,at C/N of 1:1,influent TN of 75 mg·L^(-1),HRT of 12 h,and current density of 250m A·m^(-2).The removal of TN by MTBER was mainly due to the combined processes of nitrification,heterotrophic denitrification synergistic with autohydrogenotrophic denitrification in condition of electrochemical oxidation and reduction.

关 键 词：复合钛网生物膜电极反应器 低C/N污水 脱氮性能 氢自养反硝化 同步硝化反硝化 

分 类 号：X703[环境科学与工程—环境工程]