AnMBR处理高盐榨菜废水的运行效能及膜污染特性  

Operation efficiency and membrane fouling characteristics of an anaerobic membrane reactor treating high-salt mustard tuber wastewater

作　　者：亓金鹏 肖小兰[1,2] 张瑞娜 欧阳创 晏习鹏 阮文权 QI Jinpeng;XIAO Xiaolan;ZHANG Ruina;OUYANG Chuang;YAN Xipeng;RUAN Wenquan(School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Anaerobic Biotechnology,Wuxi 214122,China;Shanghai Environmental Sanitation Engineering Design Institute Co.Ltd.,Shanghai 200232,China)

机构地区：[1]江南大学环境与土木工程学院,无锡214122 [2]江苏省厌氧生物技术重点实验室,无锡214122 [3]上海环境卫生工程设计院有限公司,上海200232

出　　处：《环境工程学报》2021年第2期553-562,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21506076,51678279);上海城投(集团)有限公司科技创新计划项目(CTKY-ZDXM-2018-009);上海市国资委项目(2018001);中央高校基本科研业务费专项资金资助(JUSRP52017B,JUSRP52030A)。

摘　　要：为了解决高盐榨菜废水的处理问题,对厌氧膜生物反应器(anaerobic membrane reactor,AnMBR)处理高盐榨菜废水的3个运行阶段(盐度提升阶段、负荷提升阶段和排泥运行阶段)的消化性能和膜污染特性进行了研究。结果表明,当盐度由初始的12.9 g·L^−1逐渐升高到33.5 g·L^−1左右、且负荷维持在0.5~1.0 kg·(m3·d)−1(以COD计)时,COD去除率及沼气产率随盐度的提升先下降后升高,最后分别稳定在75%和300 mL·g^−1(以COD计)以上,低负荷耐盐性驯化方式能够实现AnMBR的快速启动;当负荷逐渐增加约至7.6 kg·(m3·d)−1时,COD去除率达到80%左右,沼气产率稳定在330~380 mL·g^−1,VFA/ALK始终低于0.15,这表明AnMBR对高盐榨菜废水具有良好的处理效果和较强的运行稳定性;在排泥运行阶段,AnMBR的COD去除率和沼气产率均有明显上升,分别达到83%和400 mL·g^−1左右,这表明排泥可以提高消化性能。此外,排泥有利于减缓膜污染。SEM-EDX表征结果表明,膜面污染物中存在大量的有机物和无机盐类晶体物质,工程应用中建议采用NaClO清洗+酸清洗的组合清洗方式。以上研究结果可以为高盐榨菜废水处理工业化应用提供参考。In order to solve the problem of high-salt mustard tuber wastewater treatment,the digestion performance and membrane fouling characteristics of an anaerobic membrane reactor(AnMBR)treating highsalt mustard tuber wastewater at three stages(salinity improvement,organic load rate(OLR)increase and sludge discharge)were studied.The results showed that when the salinity gradually increased from the initial value of 12.9 g·L^−1 to 33.5 g·L^−1and the OLR maintained at 0.5~1.0 kg·(m3·d)−1(as COD),the COD removal efficiency and biogas yield decreased first and then increased,finally stabilized above 75%and 300 mL·g^−1,respectively.Therefore,the acclimation approach with salt tolerance at low OLR could achieve a rapid start-up of AnMBR.When the OLR gradually increased to about 7.6 kg·(m3·d)−1,the COD removal efficiency reached about 80%and the biogas yield was in the range of 330~380 mL·g^−1.The VFA/ALK was less than 0.15 at the whole operating process.These results indicated that AnMBR presented good treatment efficiency and robust stability for treating high-salt mustard tuber wastewater.At the stage of sludge discharge,both the COD removal efficiency and biogas yield increased significantly,and reached 83%and 400 mL·g^−1,respectively.This indicted that sludge discharge could improve the digestion performance.In addition,the study also found that sludge discharge was beneficial for relieving membrane fouling.Via SEM-EDX analysis indicated that a large amount of organic substances and inorganic salt crystal substances appeared on the membrane surface.Therefore,it is recommended to use a combined cleaning method with sodium hypochlorite and acid cleaning in engineering applications.This study can provide experience reference for the industrial application of high-salt mustard tuber wastewater treatment.

关 键 词：厌氧膜生物反应器 污水处理 高盐废水 膜污染 

分 类 号：X703[环境科学与工程—环境工程]