土壤水环境中污染物运移双点吸附解吸动力学模型  

Kinetic model of contaminant transport in soil-water system considering two-site absorption-desorption

作　　者：赵颖[1] 梁冰[1] 薛强[2] 刘磊[1] 王永波[1] 

机构地区：[1]辽宁工程技术大学力学与工程科学系,阜新123000 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《岩土力学》2007年第12期2574-2578,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(5037404150574048);湖北省自然科学基金计划青年杰出人才项目(2006ABB007);地质灾害防治与地质环境保护国家重点实验室资助项目(GZ2006-03);岩土力学与工程国家重点实验室开放基金(O710031Z01)

摘　　要：在考虑对流弥散、平衡/非平衡双点吸附解吸、微生物降解等情况下,建立了土壤环境中有机污染物迁移转化的动力学模型,并给出了有限差分解。在此模型的基础上,详细讨论了有机污染物在土壤中的分布规律,并对一阶吸附解吸速率常数k和平衡吸附点位所占总点位的比例f进行了灵敏度分析。分析研究表明:参数k对于土壤中有机污染物浓度分布有着重要的影响,其影响程度又与非平衡吸附点位所占总点位的比例(1-f)有关;污染后期土壤吸附相的存在,也会起到增加土壤水溶质浓度的作用,且k越大,这种作用越明显。Considering the environment behaviors of contaminant in soil, such as diffusion, equilibrium/nonequilibrium two-site absorption-desorption and microbiological degradation, the kinetic model of the contaminants transport in soil is established; and its finite difference equation is given. Based on it, the distribution regularities of the contaminant concentration in soil are discussed in detail; and the sensitivities of parameters k and f are analyzed. The study shows that the parameter k has important influence on the concentration distribution in soil and the influence degree is also related to the proportion （1- f ） of nonequilibrium sites to total sites; At the later stage of pollution, the existence of absorption phase may increases the solute concentration in the water in soil; and the lager is k, the more obvious is the influence.

关 键 词：有机污染物 土壤水环境 动力学模型 平衡/非平衡双点吸附解吸 参数分析 

分 类 号：TU443[建筑科学—岩土工程]