Multi-Stage Treatment of Sanitary Landfill Leachate

A multi-stage wastewater treatment process was developed for treating high strength sanitary landfill leachate. Magnesium ammonium phosphate was employed in the first stage precipitation treatment to remove a major portion of the ammonia nitrogen present in the leachate; low oxygen/aerobic biological treatment in mixed reactors was then performed to remove biodegradable organic pollutants ; coagulation and flocculation treatment was performed at the last to produce a dischargeable final effluent. In the test case, COD was reduced from 10 300 to 256 mg/L and that BOD was reduced from 3700 to 28mg /L.