CAJ | 학술논문

采用絮凝-超滤组合工艺对工业印染废水的二级生化出水进行深度处理,探讨了絮凝、超滤及絮凝-超滤联用对废水中COD和浊度等去除的效果,从膜通量和膜阻力的角度分析了絮凝对减轻膜污染的作用.结果表明,超滤具有较好的除浊功能,去除率高达92%,COD去除率仅43%,PAC投加量为50mg·L~(-1)时,单独絮凝对浊度去除率可达60.5%,但对COD去除率低于20%.絮凝-超滤联用不仅能提高产水水质,使浊度和COD去除率分别达到99.8%和54%,而且对提高产水通量和减轻膜污染效果显著.通过阻力计算表明,直接超滤的阻力主要为可恢复阻力,不同压力下R_r/R_(ir)值均在0.7以上,絮凝+冲洗可大幅减小膜阻力,因而更适于工业化应用.
채용서응-초려조합공예대공업인염폐수적이급생화출수진행심도처리,탐토료서응、초려급서응-초려련용대폐수중COD화탁도등거제적효과,종막통량화막조력적각도분석료서응대감경막오염적작용.결과표명,초려구유교호적제탁공능,거제솔고체92%,COD거제솔부43%,PAC투가량위50mg·L~(-1)시,단독서응대탁도거제솔가체60.5%,단대COD거제솔저우20%.서응-초려련용불부능제고산수수질,사탁도화COD거제솔분별체도99.8%화54%,이차대제고산수통량화감경막오염효과현저.통과조력계산표명,직접초려적조력주요위가회복조력,불동압력하R_r/R_(ir)치균재0.7이상,서응+충세가대폭감소막조력,인이경괄우공업화응용.
Ultrafiltration(UF)with coagulation was used to treat the secondary effluent from textile plant. The retention of turbidity and COD white compared in three cases including UF, coagulation and coagulation-ultrafiltration treatment. Results showed that although uf possessed a considerable retention rate of turbidity up to 92%, the COD removal was low as43%. At 50mg·L~(-1), dosage of PAC, single coagulation treatment had a turbidity retention as high as 60.5% while its COD retention was always lower than 20%. Treatment coupling ultrafiltration with coagultion not only improved water quality, in which the retention rate of turbidity and COD was up to 99.8%and 54% respectively, but also effectively enhanced membrane flux and alleviate mebmbrane fouling. The membrane resistances by calculation revealed that total membrane resistance was mainly composed by the recoverable resistance in single ultrafiltration treatment whose R_r/R_(ir) value was always higher than 0.7 under different pressure. Ultrafiltration treatment coupled with coagulation and backflush can reducemembrane resistance to a great extent and therefore was more suitable for industrial application.