垃圾填埋场渗滤液有机物质量浓度的预测

用假设垃圾填埋场液固相中的有机物按一级反应降解而推导出的有机物质量浓度计算模型,并利用其来预测渗滤液中COD质量浓度,根据F.G.Pohland(循环、非循环)和M.E.Tittlehaum的实验数据验证,结果表明:所建立的模型能够较准确地预测垃圾场渗滤液中的COD质量浓度,Pohland循环、Pohland非循环和Tittlehaum循环3种模式下的模型参数相关系数分别为0.892 5,0.947 4和0.916 4.以娄底市垃圾填埋场为例,最终选用了由Pohland非循环模式确定的方程及参数对垃圾渗滤液中的COD质量浓度进行预测.预测结果表明,娄底市垃圾填埋场渗滤液中的COD质量浓度在填埋初期呈逐步上升趋势,最大COD质量浓度出现在填埋后的第210 d左右,为18.324 g/L;随后浓度开始缓慢下降,在填埋后的第720 d左右时浓度约为4.649 g/L.通过与其他城市已建成的垃圾填埋场的监测数据比较,预测结果具有较高的可信度,说明该模型及其参数能够满足垃圾填埋场设计的需要,可为填埋场水处理设施的设计提供依据.

Prediction of organic matter content in leachate from landfill

A calculation model in simulating the organic matter content, which is assumed that the landfill organic matter in liquid and solid state is degraded with one-grade reaction, was set up to simulate the COD concentration of leachate. By the results from experiments of F. G. Pohland, including cycle and non-cycle method, and that of M. E. Tittlehaum, it is shown that the model can simulate the COD concentration of leachate from landfill precisely, with the correlative coefficient of 0.8925, 0.9474 and 0.9164, respectively. Taken Loudi City landfill as a case study, the model and parameters based on non-cycle theory of F. G. Pohland are adopted to simulate COD concentration of the leachate. And the simulated results show that COD concentration is ascending at the beginning while descending afterwards. The largest concentration of COD, that is 18.324 g/L, appears on the 210th day after filling, and then decreases to (4.649 g/L) on the 720th day. Compared with the monitoring data from the landfills in other cities, the results seem sound and suggest that the model and its parameters are acceptable to simulate COD concentration in landfill design.