超滤膜组合工艺处理砂滤池反冲洗水试验研究

STUDY ON FILTER BACKWASH WATER TREATMENT BY COMBINED UF PROCESS

针对净水厂砂滤池反冲洗水(FBWW)的水质特点,通过混凝-粉末活性炭-超滤工艺对砂滤池反冲洗水进行处理,以期达到反冲洗水安全回及节水节能之目的。研究结果表明,聚合硫酸铁(PFS)和粉末活性炭(PAC)投加量分别为8和15 mg/L时,混凝-粉末活性炭-超滤膜组合工艺对FBWW中浊度、DOC和UV254的平均去除率分别为99.8%、40.54%和51.39%;该组合工艺对疏水性有机物去除率大于对亲水性有机物去除率;与FBWW原水相比,组合工艺出水中三卤甲烷生成潜能降低了78.75%。因此,混凝-粉末活性炭-超滤膜组合工艺用于FBWW的处理并安全回用是切实可行的,具有理论及实际意义。

According to the water quality characteristics of filter backwash water （FBWW）, a combined process of Coagulation-PAC-UF for treatment of FBWW was investigated in this study. The results indicated that when the doses of PFS were 8 mg/L and PAC were 15 mg/L, the average removal rate of turbidity, DOC and UV254 was 99.8%, 40.54% and 51.39%, respectively. The removal efficiency of hydrophobic organic matter is higher than that of hydrophilic organic matter. Moreover, the THMFP of water after this combined process was reduced by 78.75%. As a result, the combined process of Cogulation-PAC-UF for treating and reusing of FBWW was feasible and practical.