Xiaping Solid Waste Landfill Leachate Treatment Pilot Study

Shenzhen refuse landfill site already has a suit of leachate treatment units.Because of insufficiency estimation to water quality of landfill leachate originally,the anaerobic and aerobic tank of the treatment system can't function normally.Through detailed investigation to water quality of landfill leachate, according to thewater quality status at present, the assembled technics of ammonia strippingâ†'anaerobic biological filter (AF)â†' sequencing batch reactors (SBR) is put forward.In the extended bench-scale experiment, the treatment system achievessatisfying performance, and each water quality index of effluent is up to the thirddegree leachate emission control regulations of country (GB 16889-1997 ). Except ofCOD, the others reach or approach the first degree standard of GB 16889-1997. Theremoval ratios of COD,BOD₅,NH₃-N and TN is 90%, 98%, 99% and 98%respectively.This article analyzes and discusses the influencing factors of each unit, andconcludes the each unit's design parameter. By control experiment using lime isconsidered that it gains an advantage over NaOH in adjusting pH from economy andtechnology angle. At the same time, this article analyzes and discusses the strippingtower's incrustation,dissatisfactory performance of anaerobic system,aerobicdenitrification and shortcut nitrification-denitrification of SBR system and the SBRcontrol dissolved oxygen concentration. The possible reasons and methods forcontrolling activated sludge bulking and biological foam are also discussed.