粉末活性炭-超滤一体化工艺处理微污染水中试研究

采用常规混凝沉淀结合粉末活性炭-超滤一体化中试工艺处理北江水, 经过70 d连续运行, 考察了投炭量对浊度、UV₂₅₄、COD_Mn去除率、膜污染的影响以及清洗时间对膜污染清洗效果的影响.结果表明, 粉末活性炭可有效提高有机物去除率, 在5、10和20 mg/L投炭量下, 粉末活性炭-超滤一体化工艺对UV₂₅₄去除率分别增加至27.00%、43.17%和52.97%, 对COD_Mn去除率分别增加至6.70%、20.91%和22.98%, 5~10 mg/L投炭量可满足试验水质条件下经济性和出水水质的要求;在投炭周期24 h内, 有机物去除率逐渐下降并最终趋于稳定;粉末活性炭投加对缓解膜污染有一定效果;采用NaClO进行膜污染清洗时, 浸泡4~6 h可基本使膜通量恢复.

Pilot-scale Study on Treatment of Micro-polluted Water With PAC and Ultrafiltration Integrated Process

The combined process of coagulation sedimentation and powdered activated carbon (PAC) addition in immersed ultrafiltration was used to treat Beijiang water for about 70 days continuous running. Effects of different PAC dosages on removal of turbidity, UV₂₅₄, COD_Mn, and membrane fouling were investigated, including the effect of retention-time on membrane fouling recovery.Resultsindicated that PAC could increase organic matters removal effectively, UV₂₅₄ removal increased to 27.00%, 43.17% and 52.97%, and COD_Mn removal increased to 6.70%, 20.91% and 22.98% at the dosage of 5, 10 and 20 mg/L, however, the function decrease gradually during 24h after dosing. PAC addition have an effect on mitigating membrane fouling at the same time. It could meet the demand of economics and effluent quality at the dosage of 5-10 mg/L. When cleaning the fouled membrane with NaClO, the membrane flux could recover at the retention time of 4-6h.