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|Title:||Landfill leachate: Characteristics and biological treatment in Hong Kong|
|Authors:||Obbard, J.P. |
|Source:||Obbard, J.P.,Barr, M.J.,Robinson, H.D.,Carville, M.S. (1999). Landfill leachate: Characteristics and biological treatment in Hong Kong. Resource and Environmental Biotechnology 2 (3) : 235-248. ScholarBank@NUS Repository.|
|Abstract:||The biological and chemical degradation of landfilled waste can result in the generation of large quantities of potentially polluting leachate. Landfill leachate composition varies over time with the degradation of the landfilled wastes, where leachates from younger (acetogenic) wastes typically contain high BOD (biochemical oxygen demand), COD (chemical oxygen demand), and ammoniacal-nitrogen concentrations. As the wastes decay further, methanogenic bacteria metabolise the organic compounds (BOD and COD) to produce landfill gas. Ammoniacal nitrogen concentrations remain high and thus this parameter is the major contaminant of concern in leachate throughout the life of the landfill. A consistently successful and reliable form of landfill leachate treatment has been extended aeration biological treatment in sequencing batch reactors (SBRs). SBR treatment can considerably reduce BOD and COD and result in the nitrification of ammoniacal nitrogen. Aeration encourages the formation and growth of microorganisms, which break down and metabolise the polluting components of the leachate. Extended aeration treatment processes, based on SBR technology, designed by Aspinwall and Company Ltd (Aspinwall), are widely used in the United Kingdom to treat leachate at numerous landfill sites. A series of consultancy studies commissioned by the Environmental Protection Department of the Hong Kong Government has led to the design and construction of a full-scale plant at the North East New Territories (NENT) landfill in Hong Kong. This paper presents details of leachate treatment with reference to potential applications in Asia-Pacific countries.|
|Source Title:||Resource and Environmental Biotechnology|
|Appears in Collections:||Staff Publications|
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