混凝-超滤工艺处理滦河水的中试研究

采用混凝—超滤工艺进行了处理滦河水的中试研究,考察了混凝剂投量和混凝反应时间对膜出水水质及跨膜压差的影响。结果表明,在三氯化铁投量为6 mg/L、混凝反应时间为7.5min时,系统对污染物的去除效果较好,对CODMn的去除率为48.7%,膜出水的CODMn〈2.0 mg/L,浊度〈0.1 NTU;此时的跨膜压差相对较小且随运行时间增长缓慢。在高温、高藻期,预氯化有助于提高系统对有机物的去除率并可减缓膜污染;EFM清洗方式可使膜系统长时间在较低的跨膜压差下运行,是延缓膜污染的有效手段。

Pilot-scale Study on Coagulation/UF for Treating Luan River Water

A hybrid process of coagulation/ultrafiltration membrane for treatment of Luan River raw water was investigated in a pilot-scale test.The effects of coagulant dosage and coagulation reaction time on the membrane filtration water quality and TMP were studied.The results show that when FeCl3 dosage is 6 mg/L and coagulation reaction time is 7.5 min,the process is effective in removal of pollutants,with CODMn removal rate of 48.7%,CODMn of less than 2.0 mg/L in the membrane filtration water and turbidity of less than 0.1 NTU.At the same time,the TMP is relatively low and increases slowly.In the period of high temperature and algae,prechlorination can increase the removal rate of organic matter and reudce the membrane fouling.The cleaning operation with enhanced flux maintenance(EFM) allows the membrane to run for long time under lower TMP and is an effective method to reduce the membrane fouling.