Design method of a modified layered aerobic waste landfill divided by coarse material
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RESEARCH ARTICLE
Design method of a modified layered aerobic waste landfill divided by coarse material Shi-Jin Feng 1 & Shao-Jie Wu 2 & Qi-Teng Zheng 2 Received: 28 April 2020 / Accepted: 5 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To overcome the weaknesses of traditional landfills, a modified aerobic landfill concept with intermediate covers of coarse material between waste layers functioning as facilities of drainage and aeration has been proposed recently. In this study, a onedimensional coupled model, including aerobic biodegradation, oxygen diffusion, and advection, is proposed to describe oxygen distribution in this new type of landfill. Homotopy analysis method and perturbation method are applied to solve this model at passive aeration and active aeration, respectively. The model has six input variables, that is, oxygen diffusion coefficient, gas permeability, maximum oxygen consumption rate, layer thickness of waste, and injection pressure and extraction pressure. A combination of their typical values gives rise to over 700,000 scenarios which can be calculated by the proposed solution. The coupled effect of the above variables on oxygen migration is quantitatively investigated, followed by an estimation formula of the minimum oxygen concentration in waste layer. The maximum waste layer thickness is defined as a function of other variables for a given aeration target of oxygen volume concentration larger than 5%. A generalized design method of waste layer thickness, injection pressure, and extraction pressure is then developed for the newly proposed modified layered aerobic landfill, which can promote its popularization and application. Keywords Aerobic landfill . Semi-analytical model . Oxygen migration . Design method . Waste layer thickness
Introduction Experiences from traditional landfill operations in past decades have revealed a series of problems, such as high leachate level, high temperature, drain system clogging, and slope instability (Townsend et al. 2015; Stegmann 2019). To overcome these problems, Stegmann (2019) proposed a modified
Responsible editor: Marcus Schulz * Qi-Teng Zheng [email protected] Shi-Jin Feng [email protected] Shao-Jie Wu [email protected] 1
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
aerobic landfill concept for its advantages in accelerating landfill stabilization, reducing leachate level, decreasing greenhouse gases emission, and improving landfill slope stability (Erses et al. 2008; Ritzkowski and Stegmann 2012). This concept divided the waste into multiple layers by intermediate covers made of coarse material which function as facilities of leachate drainage and aeration (Fig. 1). For this new type of aerobic landfill, a field-scale test has been carried out in Europe (Ritzkowski et al. 2016), but h
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