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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
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)
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
organic contaminants
soil
kinetic model
equilibrium/nonequilibrium two-site absorption-desorption
parameter analysis
