Investigations into the landfill behaviour of pretreated wastes

Department of Civil Engineering, Aligarh Muslim University, Aligarh 202002, India.
Waste Management (Impact Factor: 3.22). 04/2012; 32(7):1420-6. DOI: 10.1016/j.wasman.2012.03.016
Source: PubMed


Mechanical-biological treatment of municipal solid waste has become popular throughout the UK and other parts of Europe to enable compliance with the Landfill Directive. Pretreatment will have a major influence on the degradation and settlement characteristics of the waste in landfills owing to the changes in the composition and properties of the wastes. This paper presents and compares the results of long term landfill behaviour of the UK and German MBT wastes pretreated to different standards. The gas generating potential, leachate quality and settlement characteristics are highlighted. The results reveal that it is possible to achieve stabilisation of MBT waste within a year and the biogas yield and leachate strength of German MBT waste was significantly reduced compared with the UK MBT waste. The settlement resulting from mechanical creep is more significant than the biodegradation induced settlement in both cases.

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    • "At landfills, the conventional methane collection and the methane generated from MBT practices can enhance energy recovery . Still, the performance is decided by the availability of precise local parameters of waste composition to support the proper design of MBT landfilling (Siddiqui et al., 2012; Maria et al., 2013; Montejo et al., 2013). MBT, incineration and conventional sanitary landfilling can be integrated to achieve the goal of adequate MSW treatment in the context of sustainable MSW management. "
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    ABSTRACT: As a comparatively low-cost technology for waste treatment and disposal, landfilling has been adopted worldwide, particularly in developing countries. After one landfill is fully filled, the aftercare management turns into an important issue for municipalities, while the deposited waste is highly complex and condensed. Recent literature has indicated that landfill management plays an important role on critical issues of contemporary solid waste management, including biodiversity preservation, global warming mitigation, landfill mining and land reclamation. This study firstly made a comprehensive literature review on the existing studies in several Asia-Pacific economies, secondly conducted field surveys for the several illustrations of the aftercare management of closed landfills in Japan and Taiwan. Afterward, the findings from the literature and illustrations from the Asia-Pacific region were qualitatively summarized. Based on the results, concrete management strategies were discussed for the aftercare management of closed landfills in the context of land reclamation from important perspectives. For promoting the closed landfill management and seeking for adequate reclamation methods, the ex-post monitoring, impact assessments, and the essential cost-benefit analysis should be implemented with regard to respective reclamation type and local conditions. Using the outcomes of this study, municipalities can formulate concrete strategies to mitigate the risks and negative impacts, and to increase the benefits of landfills from a life-cycle perspective, considering the multi-stakeholders.
    Journal of Cleaner Production 05/2015; 104. DOI:10.1016/j.jclepro.2015.05.014 · 3.84 Impact Factor
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    • "The L 0 values of simulator tests were between 10 and 194 L/kg dry waste for a variety of waste compositions. The L 0 values of five simulator tests were below 30 L/kg dry waste, because of mechanically-biologically pretreatment of biodegradable waste (tests 8 and 9, Siddiqui et al. 2012), incomplete waste biodegradation (test 14, Staub et al. 2013) or because of the high percentage of non-biodegradable waste (tests 2 and 3, Fei et al. 2013). "
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    ABSTRACT: Methane (CH4) is generated during anaerobic biodegradation of municipal solid waste in landfills and can be collected as an energy source. CH4 generation rate (k) and potential CH4 generation capacity (L0) are two key parameters of the EPA LandGEM model used to estimate CH4 generation in full-scale landfills. These parameters can be measured in laboratory batch and simulator tests. The relationships of these parameters with waste composition - specifically, the percentages of biodegradable constituents - were investigated. k was positively correlated to the percentage of biodegradable constituents. L0 correlated well with volatile solids inthe waste. A k-L0 chart was developed to delineate the boundaries of CH4 generation rate and potential CH4 generation capacity during MSW biodegradation in laboratory tests. Waste composition and heterogeneity, moisture content and temperature likely contributed to the differences of k and L0 values obtained between batch and simulator tests.
    Geo-Shanghai 2014; 05/2014
    • "The load, settlement , temperature, and biogas outflow were monitored and logged continuously. The gas measurement system is described by Siddiqui et al. (2009), and an initial discussion of some of the results (with a focus on leachate quality) is given by Siddiqui et al. (2012). Fig. 3 "
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    ABSTRACT: The legal limitations on the amount of biodegradable municipal solid waste (MSW) disposed of to landfill have led to the development of a range of pretreatment processes known generically as mechanical biological treatment (MBT). This paper presents the results of a detailed study of the degradation and settlement characteristics of two such MBT waste residues. The effects of mechanical creep and biodegradation are quantified separately, and compared with each other and with those for raw (untreated) MSW. The effects of different degrees of treatment prior to landfilling are considered in the context of the relationship between biodegradation and settlement. The results are discussed with reference to uncoupled models for estimating consolidation, creep, and biodegradation-induced settlements in MBT wastes. The methods for determining appropriate parameter values and applying these models to practice are also suggested. (C) 2013 American Society of Civil Engineers.
    Journal of Geotechnical and Geoenvironmental Engineering 10/2013; 139(10):1676-1689. DOI:10.1061/(ASCE)GT.1943-5606.0000918 · 1.60 Impact Factor
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