多场耦合作用下溶质运移模型及机制研究

›› 2011, Vol. 32 ›› Issue (S2): 279-283.

多场耦合作用下溶质运移模型及机制研究

李振泽，勝見武，乾徹

京都大学地球环境学堂，日本京都 606―8501

收稿日期:2011-04-14 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:李振泽，男，1982年生，博士后，主要从事黏土-重金属的相互作用、水力化学电耦合、溶质运移、衬垫系统长期稳定性评价及污泥脱水等方面的研究工作
基金资助:
日本学术振兴会博士后基金（No. P09286）

Coupled modeling and mechanism of solute transport in porous media under hydraulic, electric and osmotic gradients

LI Zhen-ze, Takeshi KATSUMI, Toru INUI

Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan

Received:2011-04-14 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 最新研究表明，多孔介质中溶质运移现象受化学渗透和土壤表面电荷的多重影响。随着城市化进程的加快，卫生填埋场衬垫系统的长期安全性和淤泥脱水问题也愈加严重。为了综合研究水头，电场和化学渗透等物理作用对离子在土壤介质中迁移特性的影响，建立了一个新的多场耦合模型。该模型用有限元法取得数值解，并且利用移动边界成功实现了对淤泥脱水和填埋场衬垫系统中水溶液和化学溶质迁移问题的数值模拟。对于衬垫系统而言，化学渗透现象和渗透电势两者均可减缓溶质击穿土层的时间，有助于延长衬垫的工程寿命。对于淤泥脱水问题的分析结果表明，水力渗透系数和电渗系数分别是主导压滤式和电渗式脱水处理的主要变量。孔隙淤堵是压滤脱水中最主要的问题，土工织物表面所积聚的滤饼会导致水流量急剧下降

关键词: 耦合模型, 化学渗透, 衬垫, 淤泥脱水, 滤饼

Abstract: Recent researches revealed the significance of chemo-osmosis and mineral surface charge on solute transport in porous media. The longterm environmental assessments of landfill liners and sludge dewatering have become major concerns in many countries with the rapid expansion of civilization and urbanization. A new model was proposed to address the coupling effects of hydraulic, electrical and osmotic fields on solute transport and sludge dewatering. The coupled partial differential equations were solved numerically by finite element method along with a well configured moving boundary. For solute transport in landfill liner system, the increase in chemo-osmotic coefficient and the enhanced streaming potential constant, which is relevant to the increased net surface charge, leads to leveling off of or delayed breakthrough of toxicant at the outlet boundary. Regarding the sludge dewatering, the finite element analysis indicates that the hydraulic conductivity and electro-osmotic constant are the dominating factors during press filtration and electrokinetic dewatering. Pore blocking is considered as a major difficulty in filtration and dewatering processes. The filter cake formed in front of membrane filter contributes a lot to the reduction in solvent flux under certain dewatering conditions.

Key words: coupled modeling, chemo-osmosis, liner, sludge dewatering, filter cake

中图分类号:

TU 45

李振泽，勝見武，乾徹. 多场耦合作用下溶质运移模型及机制研究[J]. , 2011, 32(S2): 279-283.

LI Zhen-ze, Takeshi KATSUMI, Toru INUI. Coupled modeling and mechanism of solute transport in porous media under hydraulic, electric and osmotic gradients[J]. , 2011, 32(S2): 279-283.

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