Fouling Identification for Nanofiltration Membrane and the Potential Reduction of Pollutants in the Leachate by Using Fe/Al/PAC Coagulation

The reduction in the fouling is an important way to maintain steady operation for nanofiltration (NF) process leachate treatment. components from real treatment were identified using a scanning electron microscope equipped with X-ray microanalysis (SEM-EDS), infrared spectroscopy (FTIR), atomic analysis and three-dimensional fluorescence (EEM) analysis, coagulation of Fe/Al/PAC was selected reduce potential pollutants leachate, fouling. It found that organic humic acid calcium-magnesium precipitates main NF foulant layer result combination matter, inorganic precipitation, colloids microorganisms, precipitation more important, should be removed advance. PAC efficiency among coagulants selection, chemical oxygen demand (COD) removal rate 55.1%. commercially available coagulant-poly aluminum chloride (PAC) chosen as coagulant. reached 55.1%, flow through membrane increased by 35.8% under optimum condition (pH 5.0, dosage 100 mg/L, pressure 0.4 MPa). Through pilot scale test, effluent connected microfiltration then practical engineering application feasible.