ZHANGDong-jie,LIXing,YUHai-kuan,et al.Treatment of Production Wastewater from Drinking Water Treatment Plant by Coagulation-Sedimentation/Ultrafiltration Technology and Feasibility of Reuse[J].China Water & Wastewater,2023,39(15):45-50.
混凝沉淀/超滤处理给水厂生产废水及回用可行性
- Title:
- Treatment of Production Wastewater from Drinking Water Treatment Plant by Coagulation-Sedimentation/Ultrafiltration Technology and Feasibility of Reuse
- Keywords:
- drinking water treatment plant; production wastewater; coagulation-sedimentation; ultrafiltration; feasibility of reuse
- 摘要:
- 以山东某大型给水厂的沉淀池排泥水、滤池反冲洗废水、活性炭池反冲洗废水和超滤膜池反冲洗废水组成的混合生产废水为研究对象，分别采用混凝沉淀、超滤、混凝沉淀/超滤3种工艺进行处理，考察了对有机物、三卤甲烷生成势（THMFP）的去除效果以及膜污染特性，探究了3种处理工艺出水的回用可行性。结果表明，混凝沉淀工艺或超滤工艺均可不同程度地去除混合生产废水中的有机物和THMFP，而混凝沉淀/超滤组合工艺可显著提高有机物和THMFP的去除效果；混凝沉淀可有效去除不可逆膜污染物的主要组分即类溶解性蛋白质和类腐殖质，对分子质量（MW）>100 ku的DOC也有明显的去除效果，可使后续超滤单元的不可逆膜污染指数降低49.83%、膜比通量提高4.75倍；超滤可有效去除类溶解性蛋白质和类色氨酸芳香族蛋白质，并高效截留MW>100 ku的DOC；而混凝沉淀/超滤组合工艺可显著提高类色氨酸芳香族蛋白质的去除效果，使各个分子质量区间的有机物均可得到更高效的去除。直接混凝沉淀或直接超滤处理出水宜回流到给水厂进水端进行回用，混凝沉淀/超滤处理出水宜回流到给水厂超滤单元或炭滤单元进水端进行回用。
- Abstract:
- Three processes of coagulation-sedimentation, ultrafiltration and coagulation- sedimentation/ultrafiltration were used respectively for the treatment of mixed production wastewater consisting of sludge discharge wastewater from sedimentation tank, backwashing wastewater from filter, backwashing wastewater from activated carbon tank and backwashing wastewater from ultrafiltration membrane tank in a large drinking water treatment plant in Shandong Province. The removal performance of organic matter, trihalomethane formation potential (THMFP) and membrane fouling characteristics of the processes were investigated, and the reuse feasibility of effluent from the three treatment processes was explored. Coagulation-sedimentation or ultrafiltration process was effective in removing organic matter and THMFP from the mixed production wastewater to varying degrees, and coagulation-sedimentation/ultrafiltration process significantly improved the removal performance of organic matter and THMFP. The coagulation-sedimentation process effectively removed the main substances (soluble proteins and humic-like substances) that led to irreversible membrane fouling, and also had obvious removal performance for DOC with molecular weight (MW) greater than 100 ku, which reduced the irreversible membrane fouling by 49.83% and increased the membrane flux by 4.75 times in subsequent ultrafiltration unit. The ultrafiltration process effectively removed soluble proteins and tryptophan-like aromatic proteins, and efficiently intercepted DOC with MW greater than 100 ku. The coagulation-sedimentation/ultrafiltration process significantly improved the removal efficiency of tryptophan-like aromatic proteins, so that the organic matter in each molecular weight range was more efficiently removed. The effluent from coagulation-sedimentation or ultrafiltration process should be returned to the inlet end of the drinking water treatment for reuse, and the effluent from coagulation-sedimentation/ultrafiltration process should be returned to the inlet end of the ultrafiltration unit or carbon filter unit for reuse.
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