Microcoagulation has recently been considered as a promising pretreatment for an ultrafiltration (UF) process from numerous studies. To investigate the effects of microcoagulation on the performance of the UF–reverse osmosis (RO) system treating wastewater with high and fluctuant salinity, different dosages of coagulant (poly-aluminum chloride) were added prior to the UF unit in a pilot-scale UF–RO system for a 10-week period operation. Microcoagulation obviously improved the contaminant removal and cleaning efficiencies, including water backwash, chemical enhanced backwash and cleaning in place processes. Organic fouling was dominated during the initial stage of the RO membrane fouling. The microbial communities of water samples and foulant on the RO membrane were similar to those of seawater and foulant on the RO membranes from seawater RO plants. The microbial community of the foulant on the membrane was similar to that of UF permeate and RO concentrate. These results demonstrated that microcoagulation could improve the performance of the UF–RO system treating the effluent with high and fluctuant salinity from a coastal municipal wastewater treatment plant.

最近，许多研究都认为微凝是一种很有前景的超滤 (UF) 工艺预处理方法。为了研究微凝聚对 UF-反渗透 (RO) 系统处理高盐度和波动性废水的性能的影响，在中试规模的 UF 中，在 UF 装置之前添加不同剂量的混凝剂（聚合氯化铝） –RO 系统用于 10 周的操作。微凝聚显着提高了污染物去除和清洁效率，包括水反冲洗、化学增强反冲洗和原位清洁过程。在 RO 膜污染的初始阶段，有机污染占主导地位。RO膜上的水样和污垢的微生物群落与海水RO膜上的海水和污垢的微生物群落相似。膜上污染物的微生物群落与超滤渗透液和反渗透浓缩液的微生物群落相似。这些结果表明，微凝聚可以提高 UF-RO 系统处理来自沿海城市污水处理厂的高盐度和波动的污水的性能。