摘要
为提高过硫酸盐氧化剂在土壤中的传输效率,对以电渗流为主导因素的电动输运特性进行研究。通过土壤箱体的实验和数值模拟,研究电势梯度、土壤间隙水盐浓度和温度、过硫酸钠投放电极和浓度、pH对电渗流速和电渗系数影响,并分析过硫酸盐电动输运特性。结果表明,过硫酸盐在阳极投放与在两极投放时电动输运效果较好;提高投放的过硫酸盐浓度可以同比例提高相同时刻土壤中的过硫酸根浓度,但不改变电动输运所需的时间;提高电势梯度可以等比例提高电渗流速,但不能提高电渗系数;提高盐浓度可使电渗流速和电渗系数以相同比例提高;土壤升温至60℃和在2~12区间内的pH改变对电渗流速和电渗系数的提高比例为14.5%和4.8%;当盐浓度低于0.1 mol·L^(-1)时,在1、2 V·cm^(-1)的电势梯度下,土壤的最大温升分别为8℃、40℃。因此,在过硫酸盐的电动输运过程中,建议采用1V·cm^(-1)电势梯度以降低过硫酸盐的活化速率。本研究结果可为电动输运过硫酸盐的传输方案提供参考。
In order to improve the transport efficiency of persulfate oxidants in soil,the electric transport characteristics with the electric seepage as the main factor were studied.Through the experiment and numerical simulation of the soil box,the effects of the potential gradient,the concentration and temperature of water and salt in the soil gap,the sodium persulfate electrode and the concentration,the pH value on the electroosmotic velocity and the electroosmotic coefficient were studied,and the electrokinetic transport characteristics of persulfate were analyzed.The results showed that the electric transport effect of persulfate was better when it was placed at anode and poles.Increasing the persulfate concentration could increase the persulfate concentration in the soil at the same time in the same proportion,but did not change the time required for electric transport;The electro seepage velocity could be proportionally increased by increasing the potential gradient,but the electro permeability coefficient could not be increased.With the increase of soil salt concentration,the electro seepage velocity and the electro permeability coefficient could be increased in the same proportion.When the soil temperature rose to 60℃ and the pH value changed in the range of 2~12,the electro seepage velocity and electro permeability coefficient increased by 14.5% and 4.8%respectively.When the soil salt concentration was lower than 0.1 mol·L^(−1),the maximum temperature rise of soil was 8℃and 40℃ respectively under the potential gradient of 1 V·cm^(−1) and 2 V·cm^(−1).Therefore,1V·cm^(−1) potential gradient was recommended to reduce the activation rate of persulfate in the electrokinetic transport process.This study will provide theoretical reference for electric transport of persulfate.
作者
徐梦奔
王继宇
梁恒
顾海林
詹明秀
徐旭
焦文涛
XU Mengben;WANG Jiyu;LIANG Heng;GU Hailin;ZHAN Mingxiu;XU Xu;JIAO Wentao(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;Shandong Academy of Environmental Science Co.,LTD.,Jinan 250013,China;Shandong Huankeyuan Environmental Engineering Co.,LTD.,Jinan 250013,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,State Key Laboratory of Urban and Regional Ecology,Beijing 100085,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第4期1313-1326,共14页
Chinese Journal of Environmental Engineering
基金
浙江省科技计划资助项目(2022C03056)
国家自然科学基金资助项目(42277028)。
关键词
电动输运
过硫酸盐
电渗流
电渗系数
数值模拟
electric transport
persulfate
electro seepage
electro permeability coefficient
numerical simulation
作者简介
第一作者:徐梦奔(1998-),男,硕士研究生,695308488@qq.com;通信作者:顾海林(1990-),男,博士,讲师,hlgu@cjlu.edu.cn。
