Characterization of separation and thickening of humic acids from MBR-NF retentate of leachate by nanofiltration
MBR-NF截留液中腐植酸的纳滤分离浓缩特性

The retentate from membrane bioreactor (MBR) and nanofiltration (NF) combined process for landfill leachate is difficult to be treated due to high content of refractory organic matter.Since the components of refractory organics in the rtentate are almost humic acids (HA),the laboratory-scale experiments were conducted to investigate separation and thickening of HA from MBR-NF retentate of leachate by NF.Separation factor (SF) was applied to evaluate separation efficiency of NF.The data indicate that SF is strongly correlated with concentration factor (CF).The retentate from NF test performed at CF=5,contains relatively high amount of dissolved organic carbon with a value of 9 413 mg/L and insignificant concentration of heavy metals at the level of mg/L.The SF value is 2.76.These results demonstrate that NF could effectively separate and purify HA in the concentrate from landfill leachate MBR and NF treatment system from inorganic components.