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

機(jī)譯：垃圾填埋場(chǎng)城市固體廢物耦合生化和熱行為的數(shù)值模型

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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.
機(jī)譯：提出了一種耦合的生物熱（BT）模型，并驗(yàn)證了垃圾填埋場(chǎng)中城市固體廢物（MSW）的長(zhǎng)期生化和熱行為的預(yù)測(cè)。使用兩級(jí)厭氧降解模型和擴(kuò)散熱傳輸模型進(jìn)行模擬廢物的生化和熱行為。提出了考慮非最優(yōu)溫度對(duì)微生物生長(zhǎng)的抑制作用的溫度功能，以模擬垃圾填埋場(chǎng)中生化和熱行為的耦合效應(yīng)。代表常規(guī)和生物反應(yīng)器垃圾填埋條件的六種數(shù)值模擬病例進(jìn)行了典型的全級(jí)垃圾填埋單元模型，以確定垃圾填埋場(chǎng)中的長(zhǎng)期生物化學(xué)和熱特性的空間和時(shí)間變化。數(shù)值分析的結(jié)果表明，在垃圾填埋場(chǎng)中的廢物生物降解的建模中納入了垃圾的效果在實(shí)際預(yù)測(cè)MSW垃圾填埋場(chǎng)中的長(zhǎng)期生化和熱制度方面發(fā)揮著重要作用。該建議的BT模型捕獲垃圾填埋氣體（LFG）生產(chǎn)和通常在實(shí)際的全面垃圾填埋場(chǎng)中觀察到的垃圾溫度的關(guān)鍵趨勢(shì)。預(yù)測(cè)較高的廢物溫度尤其是生物反應(yīng)器垃圾填埋場(chǎng)案例，表明廢物的快速分解誘導(dǎo)高發(fā)熱速率;然而，升高的溫度是短暫的。

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