重庆祺龙村垃圾填埋场渗滤液污染特性

针对重庆祺龙村垃圾填埋场特有的水文地质条件建立相应的数学模型,确定模型的初始条件和边界条件,并进行区域离散.采用已建立的数学模型模拟有监测资料时段的渗滤液ρ(COD_Cr)和地下水水位,并把模拟值与实测值进行对比,校正模型;当模拟值与实测值较接近时,得到比较符合客观实际的数学模型.最后采用已验证的符合客观实际的数学模型,定量模拟和分析了垃圾填埋场场内、外,南、北边,以及两侧渗滤液ρ(COD_Cr)的变化,从而得到祺龙村垃圾填埋场渗滤液的污染特性.结果表明:填埋场内渗滤液污染最大,其次是南边部位,之后依次是第四纪松散堆积层,砂岩、泥岩分布区;断层是渗滤液污染物运移的通道,在其他条件相同的情况下,断层通过处及其附近污染程度大. 

Research on the Character of Leachate Pollution in Landfill of Qilongcun in Chongqing City

The transportation mathematical model of solute is established, after analyzing the specific hydro-geological conditions in Qilongcun landfill in Chongqing City. The initial and boundary conditions of the model were determined, and the regional disperse was performed. The established mathematical model was used to simulate the water level and CODCr mass concentration. The simulated water level and CODCr mass concentration values were compared with monitored data, and the model was thus adjusted. The exact mathematical model was acquired when the simulative values were approximate to actual ones. At last, the validated model was used to simulate the character of leachate pollution. The CODCr mass concentration variation was quantitatively simulated and analyzed, for the north and south ends and for the inside and outside of Qilongcun landfill. The results indicate that the leachate pollution inside the landfill is maximum, second to it is in the south of landfill, and then the incompact deposit, sandstone and mudstone area. The fault serves as pipeline for the leachate contamination movement. The leachate pollution is high around the fault, if other conditions are the same.