垃圾填埋场水分迁移模型的应用研究

以渗滤液回灌为核心的填埋场生化反应器是当今国际固体废物研究的新方向 ,其具有减少渗滤液处理难度和加速填埋场稳定化的作用 ,其中控制填埋场水分是关键。本文通过对填埋场水分运移特征的分析 ,建立了渗滤液回灌条件下 ,生化反应器填埋场水分迁移的饱和 -非饱和三维非稳定数学模型 ,并求其有限单元数值解 ,定量模拟和预报不同回灌条件下填埋场水分的时空分布规律并进行实用研究。针对重庆市长生桥卫生填埋场设计情况和实际条件 ,运移模拟模型分析了水平沟和竖式井回灌条件下填埋场内水分的分布规律 ,证明了协同回灌方式的有效性

Numerical simulation of moisture movement in landfill bioreactors under the condition of leachate recirculation

Landfill bioreactor is a new international development field in the municipal solid waste management. It can reduce the difficulty of leachate treatment and accelerate the landfill stability process. The general moisture distribution rules in landfills are analyzed in this paper and a three dimensional transient mathematical model is established to simulate the saturated-unsaturated moisture movement under the condition of leachate recirculation to landfills. The model is solved by Galerkin finite element method and tested with theis well formula. The functions of different leahcate recirculation designs in landfill bioreactors are implemented in the model. The model is applied to simulate the moisture and leachate movement in Changshengqiao Sanitary Landfill owned by Chongqing Municipality, China. The moisture movement in the landfill is simulated under the condition of leachate recirculation by vertical infiltration wells and trenches. Theoretical and practical simulation results demonstrate the correctness and effectiveness of the model.