浙江大学 a. 滨海和城市岩土工程研究中心； b. 浙江省城市地下空间开发工程技术研究中心，杭州 310058
出版日期:2020-03-28发布日期:2020-04-09通讯作者:周建（1970-），女，湖北省浠水市人，教授，博士生导师， 主要研究方向为土体各向异性、软土地基处理等.电话（Tel.）:13958025839；E-mail：zjelim@zju.edu.cn.基金资助:国家自然科学基金（51478425，51708507），浙江省自然科学基金 (LQ17E090001)资助项目Tests on the Influence on Electro-Osmotic Effect of Drainage by Adding Humic Acid Buffer Solution to the Cathode Region
ZHOU Jian a,b，GAN Qiyun a，QIAN Wei a，CAO Yun aa. Research Center of Coastal and Urban Geotechnical Engineering; b. Zhejiang Urban Underground Space Development Engineering Research Center, Zhejiang University, Hangzhou 310058, China
Online:2020-03-28Published:2020-04-09摘要/Abstract
摘要： 根据重金属污染土壤电动修复技术，在土壤阴极区添加腐植酸，通过调节pH值改善电渗排水效果，并从多个角度对最终排水效果进行了比较.提出ζ电势计算公式与排水速率的关系，并从ζ电势、碱金属离子和富里酸络合物3个角度对试验结果进行解释.结果表明：阴极区添加腐植酸会阻碍电渗排水过程，不能改善排水效果；高腐植酸含量的软土不宜进行大规模电渗排水固结.
关键词: 腐植酸缓冲液, 阴极区pH控制, ζ电势, 电动修复, 排水量
Abstract: According to the technology of electric restoration for heavy metal contaminated soil, this paper adjusted the pH value by adding humic acid buffer solution to the cathode region to improve the electro-osmotic drainage effect, and compared the final drainage effect from multiple aspects. The relation between drainage rate and ζ potential was deduced. The results were explained at the points of ζ potential, metal ion and fulvic acid’s complexation to metal ion. The results show that adding humic acid to cathode region cannot increase the drainage accumulation, and soft clay with high humic acid concentration is not suitable for large-scale electro-osmotic drainage and consolidation.
Key words: humic acid buffer, cathode pH control, ζ potential, electrokinetic remediation, drainage
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