Research and application progress of landfill leachate treatment by forward osmosis
Forward osmosis(FO)is a"resurgent"separation technology.For FO process,the spontaneous transport of water across the membrane and the low hydraulic pressure together renders its unique advantages in terms of low energy consumption and low fouling.This review first summarized the fundamentals of FO separation,the research frontiers of FO membrane materials and draw solutions,and industry development status.Thereafter,we introduced global R&D progress for landfill leachate treatment by FO,covering development of combined processes,fouling control,selection/recovery of draw solutions,recycle of valuables,techno-economic analysis,and engineering practice.The review indicated that FO+Bio-electrochemical system(BES)has great prospects due to the low energy and mass consumption in water recycling.Intermittent osmotic relaxation(IOR)backwash can efficiently remove foulant,consumes no energy and chemicals,and is easy to operate,hence deserving further investigation.Techno-economic characteristics of FO is critical for its application in treating landfill leachate and needs more detailed understanding.Additionally,a problem with currently commercialized FO membranes is the low selectivity,which led to contamination of draw solution and deterioration of landfill leachate treatment process efficiency,and therefore sound control of membrane selectivity cannot be neglected.It is expected that with the deepening of research,the advantages of FO will be exerted to the greatest extent,providing effective solutions for the sustainable development of landfill leachate treatment industry.
forward osmosislandfill leachateengineering practice
万方数据
维普
