The removal of ammonia from sanitary landfill leachate using a series of shallow waste stabilization ponds

摘要

This study evaluated the efficiency of a shallow (0.5 m deep) waste stabilization pond series tonremove high concentrations of ammonia from sanitary landfill leachate. The pond system wasnlocated at EXTRABES, Campina Grande, Paraiba, Northeast Brazil. The pond series was fed withnsanitary landfill leachate transported by road tanker to the experimental site from the sanitarynlandfill of the City of Joao Pessoa, Paraiba. The ammoniacal-N surface loading on the first pondnof the series was equivalent to 364 kg hau00021 du00021 and the COD surface loading equivalent ton3,690 kg hau00021 du00021. The maximum mean ammonia removal efficiency was 99.5% achieved by thenthird pond in the series which had an effluent concentration of 5.3 mg Lu00021 ammoniacal-N fornan accumulative HRT of 39.5 days. The removal process was mainly attributed to ammonianvolatilization (stripping) from the pond surfaces as a result of high surface pH values and waterntemperatures of 22–261C. Shallow pond systems would appear to be a promising technologynfor stripping ammonia from landfill leachate under tropical conditions.