AAO-MBR工艺污水处理系统中消毒副产物前体物变化规律  

Variation of Disinfection By-Product Precursors during Anaerobic-Anoxic-Oxic-Membrane-Bioreactor(AAO-MBR) Process in the Sewage Treatment Plant

作　　者：张雅晶[1] 缪恒锋[1,2,3] 张晓夏 周梦娟 阮文权 ZHANG Yajing;MIAO Hengfeng;ZHANG Xiaoxia;ZHOU Mengjuan;RUAN Wenquan(School of Environmental ＆ Civil Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Anaerobic Biotechnology,Wuxi 214122,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou 215009,China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]江苏省厌氧生物技术重点实验室,江苏无锡214122 [3]江苏省水处理技术与材料协同创新中心,江苏苏州215009

出　　处：《环境科学研究》2018年第12期2037-2046,共10页Research of Environmental Sciences

基　　金：国家水体污染控制与治理科技重大专项(No.2017ZX07203-003)~~

摘　　要：为探究DBPs (消毒副产物)前体物在污水处理过程中的变化情况,采用超滤膜和XAD大孔吸附树脂将AAO-MBR工艺沿程出水中DOM (溶解性有机物)进行分离,并利用3D-EEM (三维荧光光谱)对分离前后水样进行表征,同时测定DBPFP (消毒副产物生成势).结果表明:(1)沉砂池出水具有较低的C-DBPFP (含碳消毒副产物生成势);经过AAO和MBR后,由于微生物代谢作用生成的疏水性SMPs (微生物代谢产物)类物质(为主要的C-DBPs前体物质)包含较多不饱和键,导致C-DBPFP增加.(2)沉砂池出水的N-DBPFP (含氮消毒副产物生成势)较低,但经过AAO后生成的小分子物质(为主要的N-DBPs前体物)导致N-DBPFP增加;经过MBR后由于SRT(污泥停留时间)和污泥浓度的增加造成小分子物质减少,致使N-DBPFP降低.(3)市政污水经过AAO后,C-DBPs和N-DBPs前体物分别增加了90. 9%和7. 3%;而MBR具有较高的DOC去除率(74. 4%),去除了56. 8%的C-DBPs前体物和78. 1%的N-DBPs前体物.研究显示,AAO-MBR工艺对市政污水中C-DBPs和N-DBPs前体物有较好地去除效果.In order to investigate the change of disinfection by-product （DBP） precursors during the sewage treatment process, dissolved organic matter （DOM） of the effluents during the AAO-MBR process was separated with ultrafiltration membrane and XAD adsorption resin, then characterized with 3D-EEM spectra. The DBPFP of effluents and their separated fractions were further evaluated in this study. The results showed that C-DBPFP of the grit chamber effluent was low, the AAO and MBR processes could increase C-DBPFP significantly. SMPs produced by microbial metabolism during the AAO and MBR processes was the major C-DBP precursors. The grit chamber effluent also displayed low N-DBPFP. The AAO process led to the increase in N-DBPFP mainly due to the production of small molecule SMPs. The MBR process could result in the decrease in N-DBPFP comparing to the AAO process, by reducing small molecule SMPs with long SRT and high sludge concentration. In all, the AAO process would obviously enhance C-DBP and N-DBP precursors by 90.9% and 7.3%, respectively. However, the MBR process could remove 74.4% DOC, resulting in 56.8% C-DBP precursor and 78.1% N-DBP precursor removal. Therefore, AAO-MBR had a respectable removal effect on C and N-DBPs precursors in the municipal sewage.

关 键 词：消毒副产物前体物 AAO-MBR工艺 三维荧光光谱 分子量分离 亲疏水性分离 

分 类 号：X703.1[环境科学与工程—环境工程]