渗滤液回灌条件下生化反应器填埋场水分运移数值模拟

渗滤液回灌的填埋场生化反应器具有减少渗滤液处理难度、加速填埋场稳定化的作用,其中控制填埋场水分是研究的关键.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,以此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,从而可为生化反应器填埋场的设计和运行提供理论依据.

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 were analyzed in this paper and a three dimensional transient mathematical model was established to simulate the saturated unsaturated moisture movement under the condition of leachate recirculation to landfills. The model was solved by Galerkin finite element method and tested with Theis well formula. The functions of different leahcate recirculation designs in landfill bioreactors were implemented in the model. Thus, the moisture movement in the landfill could be simulated under the condition of leachate recirculation, which provides theoretical basis for the effective design and operation of landfill bioreactor.