基于渗滤液流量变化的卫生填埋场堵塞问题分析与实例

Analysis and case study on sanitation landfill clogging problem based on leachate flow rate variation

结合卫生填埋场的运行管理和渗滤液收集系统的结构特征,通过对达西定律及其应用条件的演绎与分析,得出基于渗滤液流量变化的渗滤液导流层渗透系数计算公式,并以老虎坑卫生填埋场为例,对该场的堵塞情况进行了分析。计算结果表明,堵塞问题一般随填埋场使用年限的增长而加重,堆体浸润线高度可通过渗透系数的结果进行反算。枯水期,降水及垃圾失水对库底渗滤液的补给贡献可忽略。

According to deduction and analysis of Darcy;s law and its application conditions, equation of leachate guide layer permeability coefficient based on leachate flow rate variation was deduced with a consideration of the sanitation landfill operation management and the characteristics of leachate collection system. As a practical example, Laohukeng Sanitation Landfill and its clogging were also discussed in this paper. Results showed that the clogging problem aggravates with time generally while the seepage line height could be obtained with the result of permeability coefficient. In withered water period, supply from rain and waste for bottom leachate could be neglected.