过硫酸盐协同电化学体系去除渗滤液中富里酸  

Electrochemistry and persulfate synergistic action to remove fulvic acid from leachate

作　　者：于志鹏 王以茜 曾晓岚[1] YU Zhipeng;WANG Yiqian;ZENG Xiaoan(Key Laboratory of the Ministry of education of the Three Gorges Reservoir Area,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]重庆大学教育部三峡库区生态环境重点实验室,重庆400045

出　　处：《重庆大学学报》2023年第12期34-42,共9页Journal of Chongqing University

基　　金：重庆市建委科技计划资助项目(城科字第{2015-1-31}号);重庆大学大型仪器设备开放基金资助项目(202103150126)。

摘　　要：中国多数焚烧厂采用“MBR+反渗透”工艺处理渗滤液,该工艺的反渗透膜进水富里酸含量偏高,是导致反渗透膜结垢污染的原因之一。为降低反渗透膜进水中富里酸含量,研究以过硫酸盐协同电化学体系处理自配富里酸废水,讨论体系中去除富里酸的主要活性物质,并考察了初始pH值、过硫酸盐投加量、电流密度、极板间距、NaCl质量浓度对富里酸去除率的影响。在此基础上,考察协同体系处理实际焚烧厂渗滤液MBR出水的效果。结果表明:过硫酸盐协同电化学体系对富里酸的去除能力主要由SO^(-)_(4)·、·OH和Cl^(-)生成的HClO提供,其中HClO有着较大的贡献,其次是·OH,SO^(-)_(4)·贡献最小。初始pH及极板间距对富里酸去除率的影响不大;富里酸去除率随初始过硫酸盐浓度的增大先升高后降低;随电流密度增加先增加后不变;随Cl^(-)质量浓度增大而略微降低。其中,过硫酸盐投加量、电流密度是主要的影响因素。采用过硫酸盐协同电化学体系处理实际焚烧厂渗滤液MBR出水,在电流密度30 mA/cm^(2)、过硫酸钾9 g/L的条件下反应6 h,三维荧光光谱结果显示,可见光及紫外光区富里酸的去除率分别达到98.65%和97.80%。过硫酸盐协同电化学体系能够有效去除实际废水中的富里酸。The treatment of leachate from most incineration plants in China often involves the use of“membrane bioreactor(MBR)+reverse osmosis”technology.However,this process faces challenges due to the high concentration of fulvic acid in the reverse osmosis system influent,resulting in membrane fouling.In this study,a persulfate synergistic electrochemical system(EC+PS system)was used to reduce the fulvic acid concentration.The study focused on identifying the main active substances responsible for removing fulvic acid in the system.The effect of initial pH value,persulfate dosage(PS),current density,plate space,NaCl concentration on the degradation of fulvic acid was investigated.The results showed that fulvic acid removal mainly relied on Cl^(-)provided by HClO,·OH and SO^(-)_(4)·in succession.The fulvic acid removal rate decreased slightly with increasing initial pH and plate spacing,exhibited an initial increase followed by a decrease with rising initial PS concentration,showed an initial increase followed by stability with increasing current density,and slightly decreased with the increase of Cl^(-)concentration.Both current density and persulfate dosage were identified as the main influencing factors for fulvic acid removal.In practical applications,the leachate effluent from the MBR of an actual incinerator was treated using the EC+PS system under a current density 30 mA/cm^(2),potassium persulfate 9 g/L and reaction time 6 h.Three-dimensional fluorescence spectrum analysis showed that the removal rate of fulvic acid in both visible and ultraviolet regions reached 98.65%and 97.80%,respectively,indicating the effectiveness of the EC+PS system in removing fulvic acid from real wastewater samples.

关 键 词：富里酸 过硫酸盐 活性物质 影响因素 垃圾渗滤液MBR出水 电化学 

分 类 号：X703.1[环境科学与工程—环境工程]