Performance and mechanism of gravity-driven ultrafiltration technology in treating high turbidity water
Gravity-driven ultrafiltration(GDM)process,characterized by low maintenance and no backwashing,is the preferred technology for rural water purification.However,seasonal high turbidity/storm-induced high turbidity presents significant challenges to the stability of GDM sys-tems.This study established an intermittent aeration coupled with GDM process for the direct fil-tration of high-turbidity water and investigated the mechanisms underlying flux stability and water purification efficiency during prolonged GDM operation.The results indicated that the GDM process can operate stably for an extended period without backwashing,and the coupling of aera-tion significantly enhances GDM stable flux(by 38.81％).The average removal rates for UV254,ammonia,and permanganate index were 62.22％,31.04％,and 33.86％,respectively.Intermit-tent aeration induces the bio-cake layer to become more porous and loose,enhancing microbial di-versity and strengthening the pollutant degradation efficiency of the bio-cake layer.Therefore,the GDM process can effectively address the challenges posed by seasonal high turbidity/storm-induced high turbidity in source water.
Gravity-driven ultrafiltration processHigh turbidityBio-cake layerMembrane foulingRural water supply
万方数据
维普
