阵列平板膜污染分析与清洗应用  

Membrane fouling analysis and cleaning application of arrayed flat sheet membranes

作　　者：郝燕 孙广东 代攀 张瑜 李彦 邹浩然 肖康 HAO Yan;SUN Guangdong;DAI Pan;ZHANG Yu;LI Yan;ZOU Haoran;XIAO Kang(Beijing Origin Water Membrane Technology Co.,Ltd.,Beijing 101407,China;Urban-Rural Water Environment Technology Research and Developments Center of China Jiaotong Group,Beijing 100029,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]北京碧水源膜科技有限公司,北京101407 [2]中交集团城乡水环境技术研发中心,北京100029 [3]中国科学院大学资源与环境学院,北京101408

出　　处：《膜科学与技术》2024年第6期122-131,共10页Membrane Science and Technology

基　　金：北京市自然科学基金项目(JQ22027)。

摘　　要：膜污染是膜生物反应器(MBR)中普遍存在的问题.在工程应用中对膜组器进行定期清洗是缓解膜污染的有效方法.阵列平板膜是一种波纹状的平板膜,其主要优点有装填密度大、运行通量高和免离线清洗.本文介绍了阵列平板膜在一体化污水处理装置中的应用案例及其化学清洗方案.该案例中的膜片污染较为严重,清水通量仅为未使用膜片的7%,膜表面的无机有机复合污染层中Fe和Ca的质量浓度分别达到5384 mg/m^(2)和1400 mg/m^(2),总有机碳质量浓度548 mg/m^(2)(多糖质量浓度400 mg/m^(2)).经草酸与次氯酸钠恢复性在线清洗后,跨膜压差由29 kPa恢复至11 kPa.随后,设备在25 L/(m^(2)·h)通量条件下持续运行,每月进行1次500 mg/L次氯酸钠维护性清洗,在5个月的监测周期内,设备整体未出现明显压力波动情况,表现出较好的运行稳定性.这说明有机物对无机有机复合污染起到关键作用,次氯酸钠的维护性清洗能有效去除阵列平板膜的有机污染物,进而遏制后续复合污染的形成.Membrane fouling is a common problem in membrane bioreactor(MBR).Regular cleaning of membrane cassettes is an effective method to alleviate membrane fouling in engineering applications.The arrayed flat sheet membrane,as a kind of membrane with corrugation,has the advantages of high density,high flux and being free of off-line cleaning.This article introduces the application case of arrayed flat sheet membrane in integrated MBR-based sewage purification equipment and its chemical cleaning scheme.In this case,the membrane fouling was serious,resulting in a pure water flux of only 7%of the new membrane.The amounts of Fe and Ca in the inorganic-organic composite layer on the membrane surface reached 5384 mg/m^(2) and 1400 mg/m^(2),respectively,and the total organic carbon content reached 548 mg/m^(2)(with an polysaccharide concentration of 400 mg/m^(2)).After a restorative online cleaning using oxalic acid and sodium hypochlorite,the transmembrane pressure of the arrayed flat sheet membrane recovered from^(2)9 kPa to 11 kPa.The equipment was then operated continuously at a flux of 25 L/(m^(2)·h),with a monthly maintenance cleaning using 500 mg/L sodium hypochlorite solution.During the five-month monitoring period,the transmembrane pressure did not fluctuate significantly,showing good operation stability.The result indicated that organic matter played a key role in the inorganic-organic combined fouling,and the maintenance cleaning using sodium hypochlorite could effectively remove organic foulants from the arrayed flat sheet membrane,thus curbing the formation of subsequent combined fouling.

关 键 词：阵列平板膜 膜污染 MBR 工程案例 村镇污水 一体化装置 

分 类 号：TQ028[化学工程] X505[环境科学与工程—环境工程]