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首页> 外文期刊>Journal of Solid Waste Technology and Management >EVALUATION OF HETEROGENEITY AND ANISOTROPY OF WASTE PROPERTIES ON LEACHATE RECIRCULATION IN BIOREACTOR LANDFILLS
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EVALUATION OF HETEROGENEITY AND ANISOTROPY OF WASTE PROPERTIES ON LEACHATE RECIRCULATION IN BIOREACTOR LANDFILLS

机译：生物反应器填埋场中渗滤液循环的非均质性和废物特性各向异性评估

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Leachate recirculation in municipal solid waste (MSW) landfills was modeled using HYDRUS-2D, a saturated/unsaturated flow model. The recirculation system consisted of three horizontal trenches spaced laterally at 20 m. The model was used to simulate the effect of heterogeneity and anisotropy in the hydraulic conductivity of MSW on the leachate flux that can be recircu-lated at steady-state flow condition. Monte Carlo analysis (MCA) was used for three sets of correlation lengths and variance using a iognormal hydraulic conductivity distribution for MSW. MCA estimated the mean leachate flux and its standard deviation. MCA was computationally time intensive. However, MCA quantified the variability and the uncertainty in the magnitude of leachate flux. The key finding is that heterogeneity and anisotropy in hydraulic conductivity of MSW allows us to recirculate greater leachate flux compared to homogeneous and isotropic waste under equivalent conditions. However, heterogeneity and anisotropy results in relatively non-uniform wetting of MSW. Hence, sufficient buffer between the landfill side slopes and the leachate injection system is needed to minimize the potential of leachate breakouts from the side slopes of the landfill. We also provide guidelines for selecting appropriate buffer to minimize leachate breakouts.
机译：使用饱和/不饱和流动模型HYDRUS-2D对城市固体废物（MSW）垃圾填埋场中的渗滤液再循环进行建模。再循环系统由横向间隔为20 m的三个水平沟槽组成。该模型用于模拟城市固体废弃物水力传导率的非均质性和各向异性对渗滤液通量的影响，渗滤液通量可以在稳态流动条件下重新循环。蒙特卡罗分析（MCA）用于三组相关长度和方差，使用MSW的水力传导率正态分布。 MCA估计平均渗滤液通量及其标准偏差。 MCA是计算密集型的。但是，MCA量化了渗滤液通量大小的变异性和不确定性。关键发现是，与同质和各向同性废物在同等条件下相比，MSW的水力传导率的异质性和各向异性使我们能够再循环更大的沥滤液流量。但是，异质性和各向异性导致MSW的润湿相对不均匀。因此，在垃圾填埋场的边坡和渗滤液注入系统之间需要有足够的缓冲，以使渗滤液从边坡的边坡渗出的可能性降至最低。我们还提供了选择合适的缓冲液以最大程度减少渗滤液渗出的指导。

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