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
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. "
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.
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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). "
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.
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- "The main objective of MBT is to reduce organic carbon compounds in the output residues to be deposited and therefore also in the leachates produced in comparison to those of fresh MSW (Leikam and Stegmann, 1999; Robinson et al., 2005; Siddiqui et al., 2012). However, only few leachate quality data from landfills where only MBT residues have been deposited are available because of the fact that MBT residues are typically landfilled together with variable proportions of untreated MSW, mechanically sorted organic residues, or commercial and industrial wastes (Robinson et al., 2005). "
ABSTRACT: Mechanical-biological treatment (MBT) techniques have been used to reduce the emission potential of waste before placement in landfills for a couple of years, especially in Europe. The main focus of MBT is on the reduction of native organic substances and not on nitrogen compounds. As a result, the concentrations of organic substances in leachate from MBT landfills are considerably reduced in comparison to leachates from municipal solid waste landfills, while the ammonia nitrogen concentrations remain at a high level. From the stabilization of old landfills it is well known that recirculation of leachate and supplementary aeration can reduce emissions to an acceptable level in a comparatively short time. In a series of laboratory-scale tests the efficiency of this technique for MBT residues was investigated under different boundary conditions. While the effect of leachate recirculation is also well known for MBT residues, the additional aeration has so far not been investigated. The results show that this technique has only a limited influence on the reduction of organic carbon compounds. In view of nitrogen compounds, only the additional aeration during recirculation shows a strong effect on the quality of leachate, in which the concentrations of ammonium and total nitrogen are reduced by more than 90%. The results indicate that by using simple techniques the long-term emission behavior of MBT residues can be quickly reduced to an acceptable level.
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