高密度沉淀池-超滤组合工艺处理微污染水中试

摘要

Combined pilot-scale treatment process of high density settling tank and UF is applied to treat micro- polluted raw water with low-temperature, low-turbidity, high-algae, high-organic, et al. Experimental results show that combined process has excellent removal effects on turbidity, algae and microorganism index. The turbidity of UF membrane effluent is 0.07 - 0.09 NTU, algae is removed completely, and Escherichia coli group is not detected. The average removal rate of CODMn and ammonia is 31.12% and 52.65% respectively. The removal rate of CODMn is improved to 38.6% and 44.6% respectively by addition of powered activated carbon with 3 mg/L and 5 mg/L refluxing in high density settling tank, and CODMn value of UF effluent is lower than 3.0 mg/L. Membrane pollution can be lessened. It decreases the increasing rate of trans-membrane pressure drop. Chemical washing period of UF extends effectively.%采用高密度沉淀池-超滤组合中试工艺，处理存在低温、低浊、高藻、高有机物等特点的微污染原水．试验结果表明，组合工艺对浊度、藻类及微生物指标的去除效果极佳，出水浊度值在0．07～0．09NTU，藻类基本全部去除，未检测出总大肠杆菌群；组合工艺的CODMn和氨氮去除率分别达到31．12％和52．65％，具有良好的处理效果．在高密度沉淀池中投加3mg／L和5mg／L的粉末活性炭，可使CODMn去除率分别提高至38．6％和44．6％，超滤出水ρ（CODMn）已远低于3．0mg／L，并能延缓膜污染，降低跨膜压差增长速度，有效延长超滤膜的化学清洗周期．