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  • 标题:Biological Pretreatment of Municipal Solid Waste Prior to Landfilling
  • 本地全文:下载
  • 作者:Mahar R.B. ; Yue D. ; Liu J.
  • 期刊名称:Global Nest
  • 印刷版ISSN:1790-7632
  • 电子版ISSN:2241-777X
  • 出版年度:2009
  • 卷号:11
  • 期号:04
  • 出版社:Global Nest
  • 摘要:

    The conventional landfilling does not promote sustainable waste management due to
    uncontrolled emissions which potentially degrade the environment. In this regard,
    pre-treatment of municipal solid waste prior to landfilling significantly enhance waste
    stabilization and provides various advantages. So in this regard pre-treatment methods of
    municipal solid waste were investigated. The major objectives of biological pretreatment are to
    degrade most easily degradable organic matters of MSW in a short duration under controlled
    conditions so as to produce desired quality for landfill; and to enhance methanogenic condition
    in the landfill. Factors affecting the choice of pretreatment processes include the composition
    of MSW, retention times, odor emissions, fate of toxic chemicals and costs. To investigate the
    economical pretreatment method prior to landfilling for developing countries four pretreatment
    simulators were developed at bench scale in the laboratory at different operating conditions
    forced aeration and leachate recirculation (APSFALR), aerobic pretreatment simulator by
    natural convection of air with leachate recirculation (APSNCLR), aerobic pretreatment
    simulator by natural convection of air (APSNC) and anaerobic simulator (AS).The organic
    matter, pH, temperature, settlement, leachate quantity and quality were monitored regularly. In
    the leachate quality BOD5, COD, NH4-N, pH and trace metals were analyzed. The molecular
    size distribution of dissolved organic matters (DOM) in leachate was determined after the
    pretreatment of 45 days. The results of these methods are compared. The APSNCLR method
    is economically effective method to reduce the organic matters, leachate COD and BOD5. With
    the biological pretreatment significant amount of easily biodegradable matters and volume of
    solids are reduced due to the decomposition of the waste.
    Landfilling of pretreated waste improves landfill behavior, characteristics, and operation.
    Leachate quantity, quality and landfill gas emissions also would be reduced. It is predicted by
    the comparison of carbon content in the fresh and pretreated MSW that resultantly increases
    the landfill age and decreases in aftercare monitoring period. The volumes of the solids were
    reduced and density increased significantly in eight weeks pretreatment of MSW due to
    biodegradation of organic matters. The BOD, COD5 and NH4-N content also reduced
    significantly as compared to the anaerobic simulator. Pretreatment simulators results are
    compared and concluded that pretreatment with passive aeration and leachate recirculation is
    better as compared to the other pretreatment simulators.

  • 关键词:Pretreatment Municipal Solid Waste; Sustainable Disposal; Landfilling.
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