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首页> 外文会议>Pan-American conference on unsaturated soils >Effects of Unsaturated Hydraulic Properties of Municipal Solid Waste on Moisture Distribution and Settlement in Bioreactor Landfills
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Effects of Unsaturated Hydraulic Properties of Municipal Solid Waste on Moisture Distribution and Settlement in Bioreactor Landfills

机译：市政固体废弃物对生物反应器垃圾填埋场水分分布和沉降的影响

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The performance of bioreactor landfills is dictated by the coupled processes within the landfill. In fact, the flow of leachate and its distribution within the municipal solid waste (MSW) depends on the saturated and unsaturated hydraulic properties of MSW. Although, the unsaturated hydraulic properties of MSW plays an important role in fluid and gas flow through MSW, the documented literature with regard to these properties is sparse. Moreover, it is important to account for the interdependency of hydraulic, mechanical, and biodegradation processes on moisture and pore pressure distribution in landfills. In this study, a numerical two-phase flow model was used to examine the influence of unsaturated hydraulic properties on the hydraulic behaviour and MSW settlement under a coupled hydro-bio-mechanical (CHBM) framework. Five different sets of unsaturated hydraulic properties of MSW obtained from previous experimental investigation were used for the numerical simulations in this study. The leachate recirculation was simulated, in both continuous and intermittent injection modes, using a horizontal trench system for a specific landfill configuration considered. The effect of biodegradation and consequently the MSW settlement was incorporated in the numerical framework to understand the hydraulic regime in the landfill both spatially and temporally. The results show a significant influence of unsaturated hydraulic properties on moisture distribution, pore water pressures, and MSW settlement. Future research shall focus on studying the changes in unsaturated properties of MSW with degradation and MSW composition to better understand the hydraulic behavior in bioreactor landfills.
机译：生物反应器垃圾填埋场的性能由垃圾填埋场内的耦合工艺决定。事实上，渗滤液的流动及其在城市固体废物（MSW）内的分布取决于MSW的饱和和不饱和液压性能。虽然，MSW的不饱和水力性能在通过MSW的流体和气体流中起重要作用，所记录的这些性质的文献文献稀疏。此外，重要的是考虑液压，机械和生物降解过程对垃圾填埋场中水分和孔隙压力分布的相互依赖性。在该研究中，使用数值两相流模型来检查不饱和液压性能对耦合水力 - 生物机械（CHBBM）框架下的液压行为和MSW沉降的影响。从先前实验研究中获得的MSW的五种不同的不饱和水力性能用于本研究中的数值模拟。使用用于考虑的特定垃圾填埋结构的水平沟槽系统，模拟渗滤液再循环的渗透再循环。生物降解的效果和所以将MSW沉降结合在数值框架中，以在空间和时间上了解垃圾填埋场中的液压状态。结果表明不饱和液压性能对水分分布，孔隙水压和MSW沉降的显着影响。未来的研究应专注于研究MSW的不饱和性能变化，以降解和MSW组合物，以更好地了解生物反应器垃圾填埋场中的液压行为。

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