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首页> 外文会议>The Solid Waste Association of North America~(~R) 7th Annual Landfill Symposium Jun 17-19, 2002 Louisville, Kentucky >A COUPLED MODEL FOR EVALUATING THE ECONOMIC FEASIBILITY OF LEACHATE RECIRCULATION
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A COUPLED MODEL FOR EVALUATING THE ECONOMIC FEASIBILITY OF LEACHATE RECIRCULATION

机译：评价渗滤液循环经济可行性的耦合模型

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摘要

This paper presents a one-dimensional coupled landfill leachate and gas model (LLGM), for the continuous and simultaneous simulation of post-closure leachate accretion, gas generation, and to study the effect of leachate recirculation. A folly implicit finite difference scheme of the Fokker-Planck equation is used to simulate moisture transport and distribution in the temporal and spatial domains, and then is coupled to a two-stage landfill gas first order rate equation to simulate landfill gas. This latter equation is uniquely correlated to moisture transport and distribution with a substrate utilization equation. Temporal boundary conditions are evaluated to compute a partitioned runoff, evapotranspiration, and infiltration at the capped landfill surface. The effects of the variation of key hydrologic parameters on leachate simulation are examined. An empirical cost sub - model is also developed by non- -linear Simplex regression analysis for the prediction of average long-term secondary leachate treatment costs associated with leachate recirculation. The economic viability of leachate recirculation in horizontal and vertical wells is evaluated for a hypothetical landfill gas-to-electrical energy project. Disproportionate volumes of leachate are simulated for concurrent increases in moisture content and landfill gas. The use of vertical injection wells for leachate recirculation yielded a higher net economic benefit than horizontal recharge wells, for the tested hypothetical landfill gas-to-electrical energy project. Model sensitivity analysis showed that moisture transport and retention is dependent on the antecedent moisture content, refuse saturated moisture content and saturated hydraulic conductivity.
机译：本文提出了一种一维耦合的垃圾填埋场渗滤液和气体模型（LLGM），用于连续和同时模拟关闭后渗滤液的积聚，产生的气体，并研究渗滤液再循环的效果。使用Fokker-Planck方程的愚蠢的隐式有限差分方案模拟时空域中的水分传输和分布，然后将其与两阶段垃圾填埋气一级速率方程耦合以模拟垃圾填埋气。后者方程与底物利用方程唯一地关联于水分的传输和分布。对时间边界条件进行评估，以计算覆盖的垃圾填埋场表面的分区径流量，蒸散量和入渗量。研究了关键水文参数的变化对渗滤液模拟的影响。还通过非线性单纯形回归分析开发了经验成本子模型，用于预测与渗滤液再循环相关的长期平均二次渗滤液处理成本。对于假设的垃圾填埋气电项目，评估了水平井和垂直井中渗滤液再循环的经济可行性。模拟了渗滤液体积不成比例的情况，以同时增加水分和垃圾填埋气。对于测试的假设的垃圾填埋气电项目，使用垂直注入井进行渗滤液再循环比水平注入井产生更高的净经济效益。模型敏感性分析表明，水分的输送和保留取决于先前的水分，垃圾饱和水分和饱和水力传导率。

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