TiO_2光催化-微滤膜分离深度净化亚甲基蓝印染废水

Advanced treatment of methylene blue dye wastewater by TiO_2 photocatalysis and microfiltration membrane separation

采用悬浮式TiO2光催化膜反应器深度净化纺织工业园区含亚甲基蓝印染废水经生物处理二级出水,利用中空纤维微滤膜进行催化剂截留分离,研究催化剂投加量、运行时间、溶解氧、搅拌方式对出水水质及膜通量的影响。结果表明:光催化会消耗体系溶解氧,鼓风曝气搅拌可同时为系统供氧,优于机械搅拌;该耦合体系的催化剂最佳投加量为1 g/L,经光催化氧化-膜组合工艺处理后水质优于GB 4287-1992《纺织染整工业污染物排放标准》的I级标准,符合建设部颁布的《生活杂用水水质标准》(CJ/T 48-1999)。

The effluent from the secondary settling tank of a textile industrial park wastewater treatment plant was subjected to photocatalytic degradation with the titania and UV light in a slurry photocatalytic membrane reactor（PMR）,where titania particles were separated by hollow fiber microfiltration membranes.The influences of the dosage of photocatalyst,reaction time,dissolved oxygen（DO）,mixture methods on photocatalysis efficiency and membrane separation processes were investigated in detail.The results showed that TiO2 dosage,DO and mixture methods significantly influenced the performance of PMR.The best dosage of photocatalyst was 1 g/L and the blast mixture was more fitted for PMR than the mechanical mixture.After treated by PMR,the effluent from the secondary settling tank of a textile wastewater treatment plant could match Discharge Standards of Pollutants for Dyeing and Finishing of Textile Industry（GB 4287-92）（Class I）and Miscellaneous Domestic Water Quality Standard（CJ/T 48-1999）.