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首页> 外文会议>The 22nd International Conference on Solid Waste Technology and Management(ICSW 2007) >A MODEL TO PREDICT SETTLEMENTS AND LANDFIL GAS GENERATION IN BIOREACTOR LANDFILLS
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A MODEL TO PREDICT SETTLEMENTS AND LANDFIL GAS GENERATION IN BIOREACTOR LANDFILLS

机译：一种预测生物反应器填埋量和填埋气产生量的模型

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Current practice of landfill settlement modeling is predominantly empirical, thus most of the available techniques make no attempt to simulate the real mechanisms of waste settlement. Although a landfill is an interacting multiphase medium there is limited research on landfill gas generation and dissipation as an integral part of the landfill settlements. This research describes a model which couples settlements of a bioreactor landfill with the generation and dissipation of landfill gases. The major mechanisms of waste settlement were identified as mechanical compression and biodegradation-induced strain. Mechanical compression was modeled with the help of laboratory simulations. To model the biodegradation-induced settlements, it was assumed that waste degradation obeys the first order kinetic equation. The mass balance was used to link settlement with gas pressures. The mass balance of the landfill gas was used to link settlement with gas pressures and the Richard's equation was used to simulate the distribution of moisture. The proposed mathematical model was solved numerically to predict the settlements, and gas pressures in a bioreactor landfill using landfill geometry and waste properties. To test the mathematical formulations, a numerical exercise was performed using a hypothetical bioreactor landfill. The model predicted higher strains as expected. It was also found that the high gas pressure values made a higher contribution to the total settlement. The model was capable of predicting landfill density, and the density values predicted for 25 years matched with those reported in literature.
机译：当前垃圾填埋场沉降建模的实践主要是经验性的，因此，大多数可用技术都没有尝试模拟废物沉降的真实机制。尽管垃圾填埋场是一种相互作用的多相介质，但对于垃圾填埋场产生和消散作为垃圾填埋场不可分割的一部分的研究却很少。这项研究描述了一个模型，该模型将生物反应器垃圾填埋场的沉降与垃圾填埋气的产生和散发联系起来。废物沉降的主要机制被确定为机械压缩和生物降解引起的应变。机械压缩是在实验室模拟的帮助下建模的。为了模拟生物降解引起的沉降，我们假设废物降解服从一阶动力学方程。质量平衡用于将沉降与气压联系起来。垃圾填埋气的质量平衡被用来将沉降与气压联系起来，而理查德方程被用来模拟水分的分布。对所提出的数学模型进行了数值求解，以利用掩埋场的几何形状和废物性质来预测生物反应器掩埋场的沉降和气压。为了测试数学公式，使用假设的生物反应器垃圾填埋场进行了数值模拟。该模型预测了更高的应变。还发现高气压值对总沉降有较大贡献。该模型能够预测垃圾填埋场的密度，并且所预测的25年的密度值与文献中报道的值相匹配。

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