A/O-MBR Combined System with NF/RO Membranes for Advance Treatment of Landfill Leachate
Advanced leachate treatment become more and more urgent for the sharp increasing of solid waste and sanitary landfills in China.In this study,anoxic and aerobic membrane bioreactors (A/O-MBR) system combined with nanofiltration (NF) and reverse osmosis (RO) membranes were applied to treat the industrial landfill leachate.The MBR with a biomass concentration (MLSS) of 4-5 g/L showed a high efficiency in leachate treatment.On average,the removal of chemical oxygen demand (COD) and ammonia-nitrogen (NH3-N)were 81.5% and 94.0%,respectively.After MBR treatment,although the effluent still contained 472.8-710.4mg/L COD and 18.0-39.0 mg/L NH3-N,the amount of high-valence metal ions decreased more than low-valence ones.Fe decreased by 98.1% with an initial concentration of 3.018mg/L,while Na and K decrease only 0.3 %and 1.4 % respectively.Membrane fouling was observed with the increase of membrane resistance.According to the resistance analysis,39.1% of the total resistance contributed to the cake layer,while 19.2 % to organic fouling and 22.5 % to inorganic fouling.NF and RO membranes were then used to futther treat the MBR effluent.In NF filtration,COD and NH3-N decreased to 276.25 mg/L and 26.55 mg/L respectively,while a total salt rejection of 15-20% indicated a worse desalination.However,it was found that the chromaticity obviously decreased from 125 (times) to 8 (times).Based on NF pretreatment,RO membrane held a relatively high flux in operation.The final permeate from RO membrane contained no heavy metals and had little contents of COD and NH3-N as low as 12.9mg/L and 2.6mg/L respectively,which proved to exceed the related qualification and can be reused in industry very well.
landfill leachate A/O-MBR NF RO advanced treatment
Dexin Wu Lei Qin Lusheng Xu Guoliang Zhang Qin Meng
College of Biological and Environmental Engineering,Zhejiang University of Technology,Hangzhou 31001 Department of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,P.R.China
国内会议
天津
英文
89-101
2012-09-26（万方平台首次上网日期，不代表论文的发表时间）