摘要:
渗滤液初始浓度（C0L）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C0L。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C0L对应的采样体积数,探讨C0L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C0L没有明显规律性,C0L随h增大而增大,并且根据实验数据初步建立了C0L和h、pH之间的简单数学关系模型。
Abstract:
Initial concentration of landfill leachate（C0L） 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 C0L, 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 C0L characterization is defined and correlation between C0L and column height and pHis researched. The results show that the change of C0L in the leaching liquid with pHvalues 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 C0L and height and pHis preliminarily established.
点击查看大图
下载:
