Abstract:

Coagulationphotocatalytic technology was used to pretreat seawater. The results show that at a temperature of 10—25 ℃, pH 7.0—8.0, 2.5 mg/L FeCl₃, 0.75 mg/L PAM, water turbidity removal rate was as high as 96%. When nanoTiO₂ catalyst was uesd for the photocatalytic oxidation of organic compounds in seawater in an amount of 1.8 g/L for a light reaction time of 2.5 h, the degradation rate of COD was up to 9958%. Synergistic effect between coagulation and photocatalytic oxidation eventually made effluent water meet the requirements of RO.

Key words: FeCl₃/PAM coagulation, photocatalytic oxidation, turbidity removal rate, chemical oxygen demand (COD) degradation rate