土层对污染治理药剂扩散的影响分析  

Analysis of influence of soil layer on diffusion of pollution control agents

作　　者：黄宇祺 殷德顺[1] Huang Yuqi;Yin Deshun(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100

出　　处：《能源与环保》2023年第5期167-172,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金项目(11872173)。

摘　　要：为了研究污染修复过程中治理药剂的扩散影响,以南京某污染场地土壤渗透扩散为例,借助HYDRUS软件模拟不同土层对污染治理药剂扩散的情况,通过观测点含水率、孔隙流速、浓度变化得出土层对药剂扩散的影响,数值结果表明,药剂扩散的影响主要是不同土层的孔隙、黏粒含量等差异造成土层渗透性、持水能力不同,进而导致分界处下层土壤小孔隙阻碍上层土药剂向下渗透,最终出现药剂扩散不充分、返浆问题。研究对于工程当中药剂治理污染土壤具有一定借鉴意义。In order to study the diffusion of remediation agents in the process of pollution remediation,this paper investigated the problem of soil infiltration diffusion of a contaminated site in Nanjing.With the help of HYDRUS software,the diffusion of pollution control agents in different soil layers was simulated.The influence of soil layer on the diffusion of agents was obtained by observing changes of water content,pore flow rate and concentration at the observation points.It has certain reference significance for the treatment of contaminated soil by agents in engineering.The numerical results show that the influence of reagent diffusion is mainly due to the difference of pore size and clay content in different soil layers,which leads to the difference of soil permeability and water holding capacity,and then leads to the small pores in the lower soil at the boundary,which hinders the downward penetration of the upper soil reagent,and finally leads to the problem of insufficient reagent diffusion and reverse pulp.The research has certain reference significance for the treatment of contaminated soil with chemicals in engineering.

关 键 词：溶质运移 数值模拟 层状土 土壤修复 污染场地 

分 类 号：P618[天文地球—矿床学]