摘要
采用中试规模的压力式超滤膜系统处理水厂的沉淀池出水,对试验期间的膜污染控制技术进行研究.用物理反洗、化学强化反洗(CEB)、化学清洗和预氯化对膜污染进行控制.结果表明:物理反洗工艺对于膜污染的去除效果不明显;CEB是一种物理和化学方法相结合的在线清洗方法,能够有效地恢复膜比通量,平均恢复率达85%;采用草酸进行化学清洗效果较好,4次清洗膜比通量平均提高了265L/(m2.h.0.1MPa).对膜反洗水的成分分析表明:铁和溶解性有机物是导致中试系统膜污染的主要因素.预氯化可以有效地减缓膜污染速率.
A pilot-scale low pressure ultrafiltration membrane system was used to treat the finished water from a sedimention tank in the waterworks, and the membrane fouling control was investigated. Physical backwashing, chemical enhanced backwash （CEB）, chemical cleaning and pre-chlorination were studied for membrane fouling control. The results show that the physical backwashing has a little effect on fouling control, however, CEB, an online cleaning mode could have a great effect on fouling control, and the average recovery rate of specific flux （Js） was 85%. The effect of chemical cleaning with oxalic acid was better, after cleaning, the average J~ value was increased to 265 L/（m^2 · h · 0. 1 MPa）. Pre-chlorination could slow down the fouling rate. In addition, the composition of the effluent was analysed. The results revealed that the iron and dissolved organic matters were the major factors for fouling.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2012年第4期81-86,共6页
Membrane Science and Technology
关键词
饮用水
膜污染
反洗
化学强化反洗(CEB)
化学清洗
预氯化
drinking water
membrane fouling
backwashing
chemical enhanced backwash （CEB）
chemi-cal cleaning
pre-chlorination
