Optimization measures and irreversible membrane fouling analysis of a large-scale nanofiltration surface water treatment plant
This study relies on a large-scale nanofiltration project in Jiangsu province,which works as an advanced treatment process of a surface water treatment plant.This study focuses on the optimization methods,membrane fouling,energy consumption and carbon emission of nanofil-tration process during practical engineering application.This nanofiltration project adopts the do-mestic loose nanofiltration membrane,and the permanganate index of product water is less than 0.5 mg/L while the total hardness varies between 77～107 mg/L as CaCO3,meeting the needs of healthy water.At the same time,after taking a series of optimization measures to alleviate mem-brane fouling,the power consumption was reduced from 0.239 kW·h/m3 to 0.194 kW·h/m3.The results show that choosing the appropriate antiscalant and dosage method had the most obvious effect on membrane fouling control.We found that after long-term operation,most nanofiltration membranes had a certain degree of irreversible fouling,which was affected by the feed channel spacer and the position of membrane elements.AlPO4 was the dominant inorganic fouling com-pounds,and mainly occurred in the tail elements of nanofiltration process.In the practical applica-tion of nanofiltration process,attention should be paid to the use of antiscalants with phosphate,and the concentration of residual aluminum in feed should also be reduced as much as possible.
Advanced treatment of drinking waterNanofiltration projectOptimization meas-uresIrreversible foulingEnergy consumption
万方数据
维普
