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Numerical modeling of the long term behavior of Municipal Solid Waste in a bioreactor landfill

機(jī)譯：城市生活垃圾在生物反應(yīng)器垃圾填埋場(chǎng)中長(zhǎng)期行為的數(shù)值模擬

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This paper presents a thermo-hydro–biochemo-mechanical model for simulating the long term behavior of Municipal Solid Waste (MSW) in a bioreactor landfill, in which the multi-physics coupling mechanism plays a dominant role. In the model, a two-stage anaerobic biochemical model based on McDougall’s formulation is incorporated into a fully coupled thermo-hydro-mechanical models originally developed for unsaturated porous medium. The mechanical model is a modified Camclay model allowing for biochemical hardening/softening, while the thermal model is described by a classical energy balance equation with a source term accounting for the heat generation from the biodegradation of organic matter. The hydraulic model is an unsaturated flow model using Richard’s equation. The derived coupled model is implemented into an in-house built multi-physics finite element code. Finally, numerical simulations were performed to illustrate the capability of the proposed model for estimating long-term settlement of a bioreactor landfill and its aptitude as a landfill management tool for optimizing the landfill operation
機(jī)譯：本文提出了一種熱-水-生化-力學(xué)模型，用于模擬生物反應(yīng)器垃圾填埋場(chǎng)中城市固體廢物（MSW）的長(zhǎng)期行為，其中多物理場(chǎng)耦合機(jī)制起主導(dǎo)作用。在該模型中，將基于McDougall配方的兩階段厭氧生化模型納入了最初為不飽和多孔介質(zhì)開發(fā)的完全耦合的熱-水-力學(xué)模型。機(jī)械模型是允許生化硬化/軟化的改進(jìn)的Camclay模型，而熱模型由經(jīng)典的能量平衡方程式描述，其源項(xiàng)考慮了有機(jī)物生物降解產(chǎn)生的熱量。水力模型是使用Richard方程的非飽和流模型。導(dǎo)出的耦合模型被實(shí)現(xiàn)為內(nèi)部構(gòu)建的多物理場(chǎng)有限元代碼。最后，進(jìn)行了數(shù)值模擬，以說(shuō)明所提出模型對(duì)生物反應(yīng)器垃圾填埋場(chǎng)的長(zhǎng)期沉降進(jìn)行估算的能力及其作為優(yōu)化垃圾填埋場(chǎng)操作的垃圾填埋場(chǎng)管理工具的能力。

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