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Numerical modeling of coupled biochemical and thermal behavior of municipal solid waste in landfills

机译：垃圾填埋场城市固体废物耦合生化和热行为的数值模型

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摘要

A coupled bio-thermal (BT) model is proposed and validated for the prediction of long-term biochemical and thermal behavior of municipal solid waste (MSW) in landfills. The biochemical and thermal behavior of the waste was modeled using a two-stage anaerobic degradation model and diffusive heat transport model, respectively. A temperature function that accounts for the inhibitory effect of non-optimum temperatures on the microbial growth was proposed to simulate the coupled effects of biochemical and thermal behavior of waste in landfills. Six numerical simulation cases representing conventional and bioreactor landfill conditions were performed on a typical full-scale landfill cell model to determine the spatial and temporal variation in the long-term biochemical and thermal characteristics of waste in landfills. The results from the numerical analyses show that incorporating the effect of temperature of waste in the modeling of biodegradation of waste in landfills plays a significant role in realistically predicting the long-term biochemical and thermal regime in MSW landfills. The proposed BT model captures the key trends in the landfill gas (LFG) production and waste temperatures typically observed in actual full-scale landfills. Elevated waste temperatures were predicted especially in the bioreactor landfill cases suggesting that rapid decomposition of waste induces high heat generation rates; however, the elevated temperatures were short-lived.
机译：提出了一种耦合的生物热（BT）模型，并验证了垃圾填埋场中城市固体废物（MSW）的长期生化和热行为的预测。使用两级厌氧降解模型和扩散热传输模型进行模拟废物的生化和热行为。提出了考虑非最优温度对微生物生长的抑制作用的温度功能，以模拟垃圾填埋场中生化和热行为的耦合效应。代表常规和生物反应器垃圾填埋条件的六种数值模拟病例进行了典型的全级垃圾填埋单元模型，以确定垃圾填埋场中的长期生物化学和热特性的空间和时间变化。数值分析的结果表明，在垃圾填埋场中的废物生物降解的建模中纳入了垃圾的效果在实际预测MSW垃圾填埋场中的长期生化和热制度方面发挥着重要作用。该建议的BT模型捕获垃圾填埋气体（LFG）生产和通常在实际的全面垃圾填埋场中观察到的垃圾温度的关键趋势。预测较高的废物温度尤其是生物反应器垃圾填埋场案例，表明废物的快速分解诱导高发热速率;然而，升高的温度是短暂的。

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