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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 means to solve the membrane fouling, but the effect of chemically enhanced on-line cleaning on membrane operation and the mechanism for the mitigation of membrane fouling needs further study. Ozone/Al/UF and Ozone/Activated Carbon/UF combined process for pretreatment and chemically enhanced back-flush (CEB) UF membrane system The response conditions were investigated to investigate the changes in the properties of the membrane surface, thereby analyzing the effect of different combinations on membrane fouling. Compared with the simple ultrafiltration process, the two combined processes have significantly improved the organic removal rate. Ozone pre-oxidation reduces the film surface contact angle and film roughness and improves the membrane filtration performance. After CEB was passed through the combined process system, the growth rate of the transmembrane pressure difference was significantly reduced. At the same time, the membrane contact angle and the membrane roughness decreased, indicating that the CEB can effectively alleviate the membrane fouling and improve the membrane filtration performance.