Abstract 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.

中文翻译：

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垃圾填埋场城市固体废物生化和热耦合行为的数值模拟

摘要 提出并验证了耦合生物热 (BT) 模型，用于预测垃圾填埋场中城市固体废物 (MSW) 的长期生化和热行为。废物的生化和热行为分别使用两阶段厌氧降解模型和扩散热传输模型进行建模。提出了解释非最佳温度对微生物生长的抑制作用的温度函数，以模拟垃圾填埋场废物的生化和热行为的耦合效应。在典型的全尺寸垃圾填埋场单元模型上进行了六个代表常规和生物反应器垃圾填埋场条件的数值模拟案例，以确定垃圾填埋场废物的长期生化和热特性的空间和时间变化。数值分析的结果表明，将废物温度的影响纳入垃圾填埋场废物生物降解的建模，在实际预测 MSW 垃圾填埋场的长期生化和热状态方面起着重要作用。拟议的 BT 模型捕捉了实际全尺寸垃圾填埋场中通常观察到的垃圾填埋气体 (LFG) 生产和废物温度的主要趋势。特别是在生物反应器垃圾填埋场的情况下，预计废物温度会升高，这表明废物的快速分解会导致高热产生率；然而，升高的温度是短暂的。