重金属铅污染涪陵榨菜栽培土壤的化学淋洗修复  

Study on Chemical Leaching Remediation for the Pollution of Heavy Metal Lead in Cultivating Soil of Fuling mustard

作　　者：方卢秋[1] 游豪 刘忠闯 FANG Luqiu;YOU Hao;LIU Zhongchuang(College of Chemistry and Chemical Engineering,Yangtze Normal University,Fuling 408100,Chongqing;Green Intelligence Environmental College,Yangtze Normal University,Fuling 408100,Chongqing)

机构地区：[1]长江师范学院化学化工学院,重庆涪陵408100 [2]长江师范学院绿色智慧环境学院,重庆涪陵408100

出　　处：《四川师范大学学报（自然科学版）》2022年第1期67-72,共6页Journal of Sichuan Normal University（Natural Science）

基　　金：重庆市科学技术局技术创新与应用示范(社会民生类)一般项目(CSTC2018JSCX-MSYBX0329)。

摘　　要：以模拟铅污染涪陵榨菜栽培土壤为研究对象,采用化学淋洗法修复土壤,研究淋洗剂种类、浓度、固液比和振荡时间对污染土壤中铅去除率的影响,拟为铅污染涪陵榨菜栽培土壤的化学淋洗修复提供技术支持.结果表明:所用的12种淋洗剂物质中,以表面活性剂CTAC、CTAB、硝酸和乙酸的淋洗效果较好;4种淋洗剂浓度对去除率的影响,表现为先随着浓度增加而增加,到一定值后趋于平稳或者缓慢下降;乙酸淋洗时铅的去除率最大为16.97%,硝酸淋洗时铅的去除率相对较小,仅为5.51%;铅的去除率随固液比增大呈递减趋势,当固液比为10 g/L时,铅的去除率介于64.73%~81.37%之间;在振荡时间为12 h, CTAC浓度为0.006 mol/L、CTAB浓度为0.01 mol/L、乙酸浓度为1.8 mol/L、硝酸浓度为4.0 mol/L时,铅的去除率比对照组依次增加34.76%、39.51%、48.40%和54.89%.Taking the simulated lead pollution in cultivating soil of Fuling mustard as the research object, by soil remediation with chemical leaching.the effects of leaching agent type, concentration, solid-liquid ratio and oscillation time on the removal efficiency of lead contaminated soil were studied. This study is expected to provide technical parameters for chemical leaching remediation of lead-contaminated mustard tuber soil. The results showed that the elution effects of organic chelating agents CTAC, CTAB, inorganic acid nitric acid and acetic acid were better among 12 selected elution agents. The effect of four kinds of eluents concentration on removal rate is as follows: the removal rate of acetic acid is 16.97%, whereas the removal rate of nitric acid is only 5.51%. The removal rate of leaching agent to lead-contaminated soil decreases with the increase of solid-liquid ratio. When solid-liquid ratio is 10 g/L, the removal rate of four leaching agents ranges from 64.73% to 81.37%. When the oscillation time is 12 hours and the concentrations of CTAC, CTAB, acetic acid and nitric acid are 0.006, 0.01, 1.8 and 4.0 mol/L respectively, the removal rates of the corresponding eluent increase by 34.76%, 39.51%, 48.40% and 54.89% in turn compared with the deionized water.

关 键 词：化学淋洗 淋洗剂 修复 污染土壤 铅 涪陵榨菜栽培土壤 

分 类 号：X53[环境科学与工程—环境工程]