Enhancement of Ozone on Anti-fouling Capability of PVDF Membrane and Water Purification Efficiency of Combined Process
O3/PVDF/BAC combined process was developed by integrating in-situ ozonation with a PVDF membrane.Leveraging ozone's oxidation efficiency on natural organic matter(NOM),the process not only maintained the PVDF membrane's NOM retention performance but also significantly enhanced its antifouling properties.In the O3/PVDF/BAC process,the TMP/TMP0 of the PVDF membrane increased to 1.9 after 7.5 days of operation,outperforming the antifouling effects of the PVDF membrane,hydrophilic-modified PVDF-OH membrane,and PVDF-PVP membrane.Additionally,the O3/PVDF process achieved removal rates of 11.02％for dissolved organic carbon(DOC)and 16.85％for the permanganate index(CODMn)in water from the Jingmi Diversion Channel.Due to ozone's oxidative decomposition of NOM,some small-molecule NOM passed through the membrane pores and entered the BAC unit,further enhancing the microbial and activated carbon degradation capacity for NOM.This resulted in overall DOC and CODMn removal rates of 37.12％and 48.95％,respectively,in the O3/PVDF/BAC process.Furthermore,after the operation,no significant changes were observed in the contact angle,bubble point pressure,or tensile strength of the PVDF membrane,indicating that ozonation did not accelerate the aging of the PVDF membrane.The O3/PVDF/BAC process demonstrated a significant synergistic effect,effectively controlling membrane fouling and markedly improving water purification efficiency.
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