Cleaning process of ceramic membrane in clarification of Tangkeqing water extract Fouling and cleaning of Huoxue Tongluo Injection with ultrafiltration Fouling and cleaning of Huoxue Tongluo Injection with ultrafiltration Fouling mechanism during refined process of Qingluo Tongbi Decoction by inorganic ceramic membrane Study on influencing factors of membrane flux and membrane fouling resistance in microfiltration of water extract of Cassia Semen