危险废物填埋场渗滤液初始浓度表征模拟研究  

Study of Characterization Simulation of Initial Concentration of Hazardous Waste Landfill Leachate

作　　者：唐伟[1,2] 刘玉强[1,2] 王忠兵[1] 徐亚[2] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009 [2]中国环境科学研究院,北京100012

出　　处：《环境保护科学》2014年第5期36-40,共5页Environmental Protection Science

基　　金：环境保护公益性行业科研专项(201209022);中国环境科学研究院科研业务专项(2012YSKY16)资助

摘　　要：渗滤液初始浓度（CL^0）是计算填埋场渗漏污染物源强的重要参数之一，由于填埋场构造复杂，其在运行过程中很难获取，因此在计算填埋场环境风险数学的模型常用浸出浓度（Ce）代替CL^0。本研究以典型危险废物固化飞灰为代表，开展了优势污染物Cr在不同模拟高度（h）土柱和不同浸取剂pH条件下土柱溶出模拟试验研究，通过对比不同时间段内不同体积浸出液中的总Cr浓度（CCr0），定义了表征CL^0对应的采样体积数，探讨CL^0的影响因素中其与h、pH的相关关系。研究结果表明浸取液的pH在3-7范围内时CL^0没有明显规律性，CL^0随h增大而增大，并且根据实验数据初步建立了CL^0和h、pH之间的简单数学关系模型。Initial concentration of landfill leachate （CL^0） is one of the key parameters to calculate source intensity of the pollutants leaked from the landfill site, but it is difficult to be obtained during the operation of the landfill site which is rather complicated in structure. Therefore, instead of CL^0, leaching concentration （Ce） is often used in the mathematical models for calculation of environmental risks of landfill site. In this paper, solidified fly ash is taken as a typical representative of hazardous wastes, and a study of experimental simulation of column dissolution of priority pollutant Cr from the solidified fly ash is carried out under the conditions of different column heights and leaching agents with various pH values. By comparison of the total concentration of Cr （CCr0） in the leaching liquid with different volumes at different time ranges, sampling volume corresponding to CL^0 characterization is defined and correlation between CL^0 and column height and pH is researched. The results show that the change of CL^0 in the leaching liquid with pH values from 3 to 7 is not obvious in regularity, while it increases as the column height increases. On the basis of the experimental data, a simple mathematical model for relationship between CL^0 and height and pH is preliminarily established.

关 键 词：危险废物填埋 渗滤液初始浓度 固化飞灰 浸出浓度 

分 类 号：X820[环境科学与工程—环境工程]