微气泡O_(3)/H_(2)O_(2)深度处理某树脂厂二级出水效果与机制  

Efficiency and mechanism of microbubble O_(3)/H_(2)O_(2)advanced treatment of secondary effluent from a resin factory

作　　者：陈洋 倪鹏飞 吴春笃 张波 征晓勇 CHEN Yang;NI Pengfei;WU Chundu;ZHANG Bo;ZHENG Xiaoyong(School of Environmental and Safety Engineering,Jiangsu University;Changzhou Engineering and Technology Research Institute of Jiangsu University;Jiangsu Huanchuan Environment Engineering Co.,Ltd.)

机构地区：[1]江苏大学环境与安全工程学院 [2]常州江苏大学工程技术研究院 [3]江苏环川环境工程有限公司

出　　处：《环境工程技术学报》2024年第4期1158-1166,共9页Journal of Environmental Engineering Technology

基　　金：常州市应用基础研究计划项目(CJ20220025)。

摘　　要：针对传统生物降解对树脂废水中苯系物、聚乙烯醇等大分子有机物降解效果不好、达不到排放标准的问题,构建微气泡O_(3)/H_(2)O_(2)体系,对某树脂厂二级出水进行深度处理。对比了微气泡O_(3)曝气与普通O_(3)曝气的化学需氧量(COD)降解效果,考察了进气O_(3)浓度、H_(2)O_(2)浓度、初始pH对微气泡O_(3)/H_(2)O_(2)体系降解COD效果的影响,通过总有机碳验证体系的矿化效果,通过电子顺磁共振谱仪(EPR)检测微气泡O_(3)/H_(2)O_(2)体系中的活性物质,最后通过气相色谱质谱联用仪(GC-MS)分析降解前后废水中主要有机物的种类,并对微气泡O_(3)/H_(2)O_(2)体系降解COD的机制与路径进行分析。结果表明:1)微气泡O_(3)/H_(2)O_(2)体系中微气泡粒径主要分布在10~50μm,平均粒径为32.82μm;与普通O_(3)曝气方式进行对比,微气泡O_(3)体系对COD降解率更高,说明微气泡可以延长O_(3)气泡上升时间,增加O_(3)气泡比表面积,提高O_(3)传质系数和利用率。2)微气泡O_(3)/H_(2)O_(2)体系降解COD,当O_(3)浓度为60 mg/L、H_(2)O_(2)浓度为29.37 mmol/L、pH为7时,反应60 min后,微气泡O_(3)/H_(2)O_(2)体系对树脂厂二级出水的COD降解率为89.53%,处理后出水COD为15.05 mg/L,可达到GB 31572—2015《合成树脂工业污染物排放标准》。3)EPR试验表明,H_(2)O_(2)可以促进微气泡O_(3)体系产生更多的超氧自由基(·O_(2)^(-))和羟基自由基(·OH),从而提高体系的氧化能力和对COD的降解效果。根据GC-MS结果推断O_(3)/H_(2)O_(2)体系降解COD的可能路径,即树脂厂二级出水以长链烷烃和环烷烃类为主的大分子物质在O_(3)的作用下断链、开环,在·OH等自由基的作用下矿化或降解为以小分子有机酸为主的小分子物质。Aiming at the problem that traditional biodegradation can not degrade the chemical oxygen demand(COD)of benzene series,polyvinyl alcohol and other macromolecular organic compounds in resin wastewater,and can not meet the discharge standard,a microbubble O_(3)/H_(2)O_(2)system was constructed to treat the secondary effluent of a resin factory deeply.The COD degradation effects of microbubble O_(3)aeration and ordinary O_(3)aeration were compared,and the effects of inlet O_(3)concentration,H_(2)O_(2)concentration and initial pH on COD degradation efficiency of microbubble O_(3)/H_(2)O_(2)system were investigated.The mineralization effect of the system was verified by total organic carbon(TOC),and the active substances in microbubble O_(3)/H_(2)O_(2)were detected by electron paramagnetic resonance spectrometer(EPR).Finally,the types of main organic substances in wastewater before and after degradation were analyzed by GC-MS,and the mechanism and path of COD degradation by microbubble O_(3)/H_(2)O_(2)system were analyzed.The results showed that:(1)In the microbubble O_(3)/H_(2)O_(2)system,the particle size of microbubbles was mainly distributed in the range of 10-50μm,with an average particle size of 32.82μm.Compared with ordinary aeration,microbubble O_(3)system had a higher degradation rate of COD,which indicated that microbubbles could prolong the rising time of O_(3)bubbles,increase the specific surface area of O_(3)bubbles,and improve the mass transfer coefficient and utilization rate of O_(3).(2)The analysis of influencing factors of COD degradation by microbubble O_(3)/H_(2)O_(2)system showed that when O_(3)concentration was 60 mg/L,H_(2)O_(2)concentration was 29.37 mmol/L,and pH was 7 after 60 minutes of reaction,the COD degradation rate of secondary effluent of the resin factory by microbubble O_(3)/H_(2)O_(2)system was 89.53%,and the treated effluent COD was 15.05 mg/L,meeting the requirements of Emission Standard of Pollutants for Synthetic Resin Industry(GB 31572-2015).(3)The EPR test showed that H_(2)O

关 键 词：微气泡O_(3) 过氧化氢(H_(2)O_(2)) 羟基自由基(·OH) 有机物 树脂废水 深度处理 

分 类 号：X703[环境科学与工程—环境工程]