Modifying PVDF membrane by blending hydrophilic nano TiO has been highly concerning, but its practical application is not well investigated. In this study, PVDF-TiO membrane was employed in two modes to treat micro-polluted raw water for the first time, direct membrane filtration and pre-oxidation assists membrane filtration. At two filtration modes, the PVDF-TiO membrane had comparable rejection capability to the unmodified PVDF membrane, as the removal of permanganate index (COD) was 0.26-0.72 mg/L, UV was 0.0070-0.0618 cm, turbidity was 1.60-4.49 NTU, and the total number of colonies was 360-23,780 CFU/mL. As for raw water treatment, using Fe/sodium dithionite (DTN)/O system as the pre-oxidation process to assist the filtration of the PVDF-TiO membrane was feasible. After optimization, the applicable conditions of the Fe/DTN/O process were DTN dosage at 100 mg/L and a C/C of 1:4. As a result, the effluent qualities of the PVDF-TiO membrane significantly improved. It was investigated that atrazine (ATZ), COD, UV and turbidity reduced, which was realized by the synergic effects of the pre-oxidation by free radicals and flocculation by iron. Pre-oxidation of the Fe/DTN/O process could also enhance the permeability of the PVDF-TiO membrane from 53.6 to 58.0 L/(m·h), nearly two times the PVDF membrane. Besides, the practical fouling of the PVDF-TiO membrane was stably alleviated by the reduced R, R and R, mainly due to constraining the internal pore fouling effectively.
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