摘要
先后采用次氯酸钠和盐酸两种药剂对长期运行的超滤膜进行化学清洗,利用基于化学清洗的膜污染研究方法,分析混凝—浸没式超滤组合工艺中造成膜污染的主要物质成分。结果表明,经次氯酸钠清洗后,膜池中UV254、DOC、Al、Fe的浓度增加,增幅分别达到0.146 3 cm-1、4.14mg/L、0.058 mg/L、0.005 mg/L;继续使用盐酸进行化学清洗,膜池中UV254、DOC、Al、Fe的浓度分别增加了0.070 9 cm-1、0.83 mg/L、18.293 mg/L、2.673 mg/L。化学清洗后,膜丝表面的C、O、Si、Al的相对含量分别下降5.2%、10.5%、1.8%、0.6%,F的相对含量升高17.8%。长期运行的超滤膜存在严重的有机物污染和Al、Si等无机元素沉积现象,次氯酸钠清洗可有效去除膜的有机物污染,随后的盐酸清洗可解除无机元素的沉积,同时实现有机物的进一步去除,但化学清洗后仍然存在残留污染。
Chemical cleaning of long-term operated uhrafiltration membrane was carried out using sodium hypochlorite and hydrochloric acid, respectively. Research method of uhrafihration membrane fouling based on chemical cleaning was used to identify the main components causing membrane fouling in the coagulation/immersed ultrafiltration combined process. The results showed that after cleaning with so- dium hypochlorite, concentrations of UV254, DOC, A1 and Fe in membrane tank increased by 0. 146 3 -1 cm , 4.14 mg/L, 0. 058 mg/L and 0.005 mg,/L, respectively, and then after cleaning with hydrochlo- ric acid, concentrations of UV254, DOC, A1 and Fe in membrane tank increased by 0.070 9 cm-1, O. 83 mg/L, 18. 293 mg/L and 2. 673 mg/L, respectively. After the combined chemical cleaning, the relative contents of C, O, Si and A1 on membrane surface decreased by 5.2% , 10.5%, 1.8% and O. 6% , re- spectively, and F contents increased by 17.8%. The presence of severe organic contamination and depo-sition of A1, Si and other inorganic elements was observed after long-term operation of the ultrafiltration membrane. The cleaning with sodium hypochlorite could effectively remove organic contamination, the following cleaning with hydrochloric acid could effectively eliminate deposition of inorganic elements and achieve further removal of organic matter, but residual contamination persisted after chemical cleaning.
出处
《中国给水排水》
CAS
CSCD
北大核心
2013年第17期51-54,共4页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2009ZX07423-003)
广东省科技计划项目(2012B010500031)
深圳市科技研发资金资助基础研究计划项目(JC201105201234A)
关键词
混凝
超滤
化学清洗
膜污染
coagulation
ultrafihration
chemical cleaning
membrane fouling
