摘要
化学清洗是解决膜污染的有效手段,但是化学强化在线清洗对膜运行的影响和对膜污染的缓解机理有待进一步研究。采用臭氧/硫酸铝/超滤(Ozone/Al/UF)和臭氧/活性炭/超滤(Ozone/PAC/UF)组合工艺对实施预处理过程和化学强化反冲洗(CEB)后超滤膜系统的响应情况进行考察,研究膜表面性质的变化情况,从而解析不同组合工艺对膜污染的影响机理。两种组合工艺相较于单纯的超滤工艺在有机物去除率方面有明显提高。臭氧预氧化降低了膜表面接触角和膜粗糙度,使膜过滤性能得到改善。组合工艺系统经过CEB后,跨膜压差增长速率均有明显降低,同时膜接触角和膜粗糙度下降,说明CEB可以有效缓解膜污染,提高膜过滤性能。
Chemical cleaning is an effective solution to membrane fouling. However, additional research is needed on the effects of online chemically enhanced cleaning on the membrane operation and the cleaning mechanism of membrane fouling. The response of uhrafihration membrane, with pretreatment and chemically enhanced backwash （CEB） , was investigated in combined processes of both Ozone/M/ UF and Ozone/PAC/UF. Changes in membrane surface properties were analyzed to assess the impact of combined processes on the membrane fouling mechanism. Both combined processes had significantly improved the organic matter removal efficiency, compared with the simple ultrafihration process. Ozone preoxidation reduced the contact angle and the roughness of the membrane surface, and promoted the mem- brane filtration performance. The growth rate of transmembrane pressure substantially decreased after CEB. The decline of membrane contact angle and membrane roughness indicated that CEB could effectively mitigate membrane fouling and enhance the performance of membrane filtration.
出处
《中国给水排水》
CAS
CSCD
北大核心
2017年第11期68-71,共4页
China Water & Wastewater
基金
国家自然科学基金资助项目(51308373)
天津市科委特派员项目(16JCTPJC51200)
天津市科技计划项目(16YFXTSF00390)
