The membrane fouling and interface mechanism of reclaimed wastewater treatment by three different processes

摘要

This paper focused on the effects of powdered activated carbon (PAC) and biological powdered activated carbon (BPAC) dosages on ultrafiltration (UF) membrane flux caused by natural organic matter (NOM) fractions in secondary effluent. Moreover, the membrane fouling resistance and the membrane-foulant interaction mechanism were also investigated. The results indicated that the dosages of PAC/BPAC exhibited remarkable performance in alleviating membrane flux, the best PAC dosage for the membrane flux variation of raw water was 10 and 40 mg/L for BPAC. The BPAC-UF combination process has substantially low irreversible fouling resistance, and the best dosage in all processes caused the greatest reversible fouling resistance. The BPAC-UF process showed excellent performance with respect to NOM removal on the three-dimensional fluorescence detection of secondary effluent. The microorganisms on the surface of BPAC can strengthen the removal of organic compounds in water. The polar force plays a leading role in the whole membrane fouling process.