Double-membrane process was used for coking wastewater reuse

the DOW

TM

BW30XFR-400/34 i series reverse osmosis membrane was selected in the project. In comparison with new BW30 XFR membrane module

the flux decreased more than 95% for the fouled membrane module. It was found that the recovery of membrane capability required repeated and long-term chemical cleaning. The soaking method could improve the cleaning effect greatly. LC-07 could remarkable effect on membrane characteristics with more than 95% flux recovery. The rejection of membrane increases to more than 90% after chemical cleaning

contrast with 57.23% of fouled membrane. As shown in SEM results

there were still membrane foulants on the

membrane surface. ATR-FTIR spectra showed that after chemical cleaning

the O=S=O symmetrical stretching vibration peak of the support layer of polysulfone had obvious red shift

and the characteristic peaks of amide I and amide II had blue shift

which might be that the presence of pollutants in the membrane surface led to the electronic transition of the characteristic groups.