电化学协同过硫酸盐去除焚烧厂MBR出水富里酸的机理研究  

Mechanism of Fulvic Acid Removal from MBR Effluent in an Incineration Plant Leachate Treatment System by Sodium Persulfate Oxidation with Electrochemistry Coprocessing

作　　者：卢雨杉 于志鹏 丁文川[1] 吴思妍 李东铭 敖延瑾 周俊朗 金桓宇 秦霁桐 曾晓岚[1] LU Yushan;YU Zhipeng;DING Wenchuan;WU Siyan;LI Dongming;AO Yanjin;ZHOU Junlang;JIN Huanyu;QIN Jitong;ZENG Xiaolan(Key Laboratory of the Three Gorges Reservoir Region’s Eco-environment of Ministry of Education,Chongqing University,Chongqing 400045,China;Chongqing Bashu Secondary School,Chongqing 400013,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆市巴蜀中学,重庆400013

出　　处：《环境科学与技术》2024年第12期26-32,共7页Environmental Science & Technology

基　　金：国家外国专家项目(G2022165012L);第八届重庆市大学生创新训练项目(S202310611250);重庆市教育委员会项目(CY240127);中国电建集团成都勘测设计研究院有限公司科技项目(P45220)。

摘　　要：该研究选取不锈钢与Ti/IrO_(2)涂层电极、石墨与石墨分别作为一、二级反应池的阴阳极,采用两级电化学协同过硫酸盐法去除焚烧厂渗滤液MBR处理出水中的富里酸。通过淬灭实验,依次探讨了过硫酸钠(PDS)投加量和电流密度2种主要因素对富里酸降解机理的影响。结果表明:(1)当PDS=12 g/L,J=14.7 mA/cm^(2)时,一级反应池中富里酸的去除率达88.70%,主要归因于活化态PDS(*PDS)及∙OH的氧化和Fe(OH)3絮凝作用。适当增加PDS投加量可显著促进*PDS氧化作用,但对体系中其他机制的影响较小;提高电流密度可显著促进∙OH氧化作用。(2)在二级反应池中不投加PDS,当J=14.7 mA/cm^(2)时,两级反应池总去除率达95.55%。中、低电流密度下,二级反应池中富里酸的去除主要归因于*PDS及∙OH的氧化作用;高电流密度下,∙OH氧化为主要作用。In order to effectively remove fulvic acid from membrane bioreactor(MBR)effluent in an incineration plant leach⁃ate treatment system,a two-stage persulfate oxidation with electrochemistry cooperation method was employed.The stainless steel and Ti/IrO_(2)-coated electrodes,the graphite and graphite were set as both cathode and anode for the primary and the sec⁃ondary reaction cells,respectively.The influences of two main factors,peroxydisulfate(PDS)dosage and current density,on fulvic acid degradation mechanisms were explored through quenching experiments.The results showed that when PDS=12 g/L and J=14.7 mA/cm^(2),the removal rate of fulvic acid reached 88.70%in the primary reaction cell under*PDS oxidation,∙OH oxidation and Fe(OH)3 flocculation.Different from other mechanisms,the*PDS oxidation was remarkably enhanced with the proper increase of PDS.The∙OH oxidation could be significantly promoted by increasing current density.When no PDS dosing and J=14.7 mA/cm^(2) in the secondary reaction cell,the total removal rate of fulvic acid for the two-stage reaction cells could reach 95.55%.In the secondary reaction cell,the fulvic acid was removed mainly by*PDS oxidation and∙OH oxidation with low or medium current density.When current density increased,∙OH oxidation was more significant than*PDS oxidation.

关 键 词：富里酸 电化学协同过硫酸盐体系 作用机制 两级反应池 MBR出水 焚烧厂渗滤液 

分 类 号：X703.1[环境科学与工程—环境工程]