污染土电动修复间歇通断电时间确定方法  

The Determining Method of the Intermittent Power Supply On-off Time in Electrokinetic Remediation of Polluted Soil

作　　者：王鼎 黄新 文磊 张伟 赵梦雅 石学桥 WANG Ding;HUANG Xin;WEN Lei;ZHANG Wei;ZHAO Mengya;SHI Xueqiao(Kunde Smart Geotechnical Technology Research Institute of Zhejiang Kunde Innovate Geotechnical Engineering CO.,LTD.,Ningbo 315100,Zhejiang,China)

机构地区：[1]浙江坤德创新岩土工程有限公司坤德智慧岩土技术研究院,浙江宁波315100

出　　处：《科技和产业》2023年第8期168-173,共6页Science Technology and Industry

摘　　要：电动技术是对低渗透性污染土进行除污修复的最具前途的方法,间歇供电模式能有效克服该技术高能耗的缺点;但如何确定间歇供电参数却未见相关报道。通过测定通电后阳极极室液中Cl-增长速率达到稳定所需的时长t 1和断电后Cl-增长速率趋于零的时长t 2,以及基于t 1和t 2进行的间歇供电模式和恒常供电的电动除氯试验,得到如下结果:在电场力作用下,离子的运动与宏观物体在力作用下的运动规律相似;采用按离子的运动规律确定的供电时长和间歇时长进行的间歇供电试验与恒常供电相比,达到同等除氯效果的能耗降低35.8%。恒常供电时,离子在电场作用下做加速运动,使阴、阳极附近分别聚集了大量与电极极性相反的离子,由此增加了阻抗;而间歇供电时,阴阳两极基本处于平稳的低离子浓度状态,因此间歇供电降低了能耗。Electrickinetic technology is the most promising method for decontamination and remediation of low-permeability contaminated soils,Intermittent power supply mode can effectively overcome the shortcomings of high energy consumption of this technology.However,there is few relevant report on how to determine the parameters of intermittent power supply.Based on the test measuring the time t 1 required for the growth rate of Cl-in the anodic chamber liquid to stabilize after power-on and the time t 2 when the growth rate of Cl-tends to zero after power-off,and the contrast electrickinetic chlorine removal test of constant power supply mode and the intermittent power supply mode with the t 1 and t 2,the results are as follows:Under the action of electric field force,the motion of ions is similar to that of macroscopic objects under the action of force,achieving same dichlorination effect,the test of intermittent power supply mode can save energy consumption by 35.8%as compared with the test of constant power supply mode.In the constant power supply mode,the ions are accelerated under the action of the electric field,so that a large number of ions with opposite polarities to the electrodes are gathered near the cathode and anode,which increasing the impedance,while in the case of intermittent power supply,near the cathode and anode,the ion concentration are basically in a stable low state,therefore,the energy consumption is reduced in the intermittent power supply mode.

关 键 词：电动技术 间歇供电模式 通断电时长 能耗 

分 类 号：X53[环境科学与工程—环境工程]