陈欣园^1,,
仵彦卿¹
1.上海交通大学环境科学与工程学院，上海 200240
基金项目: 国家自然科学基金资助项目（41272261）

Remediation mechanism of multi-heavy metal contaminated soil by using different chemical washing agents

CHEN Xinyuan^1,,
WU Yanqing¹
1.School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China

-->

摘要
HTML全文
图(0)表(0)
参考文献(32)
相关文章
施引文献
资源附件(0)
访问统计

摘要:化学淋洗技术是一种常用的重金属污染土壤修复技术，化学淋洗剂的选择尤为重要。以乙二胺四乙酸二钠（EDTA）、柠檬酸（CA）和三氯化铁（FeCl3）为化学淋洗剂，采用振荡淋洗法研究淋洗时间与淋洗剂浓度对Cu、Zn、Pb和Cd去除效果的影响，分析重金属污染土壤淋洗前后重金属形态与基本理化性质的变化。结果表明：3种化学淋洗剂对重金属的快速反应阶段基本在60 min内，在240 min达到淋洗平衡，对Pb和Cd的淋洗主要是非均相扩散过程；EDTA、柠檬酸和FeCl3对重金属的去除能力依次为Pb>Cd>Cu>Zn，Cd>Zn>Cu>Pb与Pb≈Cd>Cu>Zn，EDTA的淋洗效率最高，Cd的解吸能力最强；EDTA和FeCl3可有效去除弱酸可溶态与可还原态重金属，柠檬酸能有效去除弱酸可溶态重金属，修复后的土壤仍有环境风险；3种淋洗剂修复后的土壤中总有机碳与粒径分布无明显变化，FeCl3会酸化土壤。综合考虑，EDTA、柠檬酸和FeCl3均为淋洗效果好的环境友好型化学淋洗剂，该研究成果可用于现场淋洗去除土壤中重金属的小试。
关键词: 重金属污染土壤/
EDTA/
柠檬酸/
FeCl3/
修复机理

Abstract:Chemical washing technology is a commonly used technology in the remediation of heavy metal contaminated soil, where the selection of washing agents is particularly important. Batch experiments were conducted to study the duration and concentration effects of three chemical agents, including EDTA, citric acid, and FeCl3 on removal of Cu, Zn, Pb and Cd from contaminated soil. The changes in the form of heavy metals and soil physicochemical properties were also analyzed before and after washing treatment. The results indicated that the rapid reaction was completed within 60 minutes, and all reactions reached equilibrium in 240 minutes. The desorption of Pb and Cd was observed as a heterogeneous diffusion process. The extraction efficiencies of EDTA, citric acid, and FeCl3 on removal of target heavy metals were Pb>Cd>Cu>Zn, Cd>Zn>Cu>Pb and Pb≈Cd>Cu>Zn, respectively. Among them, EDTA had the highest washing efficiency and Cd was the easiest to be desorbed in an integrated point of view. The EDTA and FeCl3 can effectively remove the acid extractable and reducible fractions of heavy metals, whereas citric acid was more effective in removing the acid extractable fraction. The use of three washing agents did not change the TOC contents and distortional pattern of particle size in target soil, while FeCl3 acidified the soil. In sum, EDTA, citric acid and FeCl3 are environmentally friendly agents and this study can be applied to a bench-scale experiment concerning site ex-situ remediation of multi-heavy metal contaminated soil.
Key words:heavy metal contaminated soil/
EDTA/
citric acid/
FeCl3/
remediation mechanism.

[1]	KHALID S, SHAHID M, NIAZI N K, et al.A comparison of technologies for remediation of heavy metal contaminated soils[J].Journal of Geochemical Exploration,2017, 182(part B): 247-268 10.1016/j.gexplo.2016.11.021
[2]	HE B, YUN Z J, SHI J B, et al.Research progress of heavy metal pollution in China: Sources, analytical methods, status, and toxicity[J].Chinese Science Bulletin, 2013, 58(2): 134-140
[3]	YAO Z, LI J, XIE H, et al.Review on remediation technologies of soil contaminated by heavy metals[J].Procedia Environmental Sciences,2012, 16(4): 722-729
[4]	YANG X, MAO X, SHAO X, et al.Enhanced techniques of soil washing for the remediation of heavy metal-contaminated soils[J].Agricultural Research, 2018, 7(2): 99-104
[5]	串丽敏, 赵同科, 郑怀国, 等.土壤重金属污染修复技术研究进展[J].环境科学与技术,2014,37(S2): 213-222
[6]	QIAO J, SUN H, LUO X, et al.EDTA-assisted leaching of Pb and Cd from contaminated soil[J].Chemosphere, 2017, 167: 422-428 10.1016/j.chemosphere.2016.10.034
[7]	BEIYUAN J, TSANG D C W, VALIX M, et al.Combined application of EDDS and EDTA for removal of potentially toxic elements under multiple soil washing schemes[J].Chemosphere, 2018, 205: 178-187 10.1016/j.chemosphere.2018.04.081
[8]	NOWACK B, SCHULIN R, ROBINSON B H.Critical assessment of chelant-enhanced metal phytoextraction[J].Environmental Science & Technology, 2006, 40(17): 5225-5232 10.1021/es0604919
[9]	PéREZ-ESTEBAN J, ESCOLáSTICO C, MOLINER A, et al.Chemical speciation and mobilization of copper and zinc in naturally contaminated mine soils with citric and tartaric acids[J].Chemosphere, 2013, 90(2): 276-283 10.1016/j.chemosphere.2012.06.065
[10]	JIANG J, YANG M, GAO Y, et al.Removal of toxic metals from vanadium-contaminated soils using a washing method: Reagent selection and parameter optimization[J].Chemosphere, 2017, 180: 295-301 10.1016/j.chemosphere.2017.03.116
[11]	黎诗宏,蒋卉,朱梦婷,等.有机酸对成都平原镉污染土壤的淋洗效果[J]. 环境工程学报, 2017, 11(5): 3227-3232 10.12030/j.cjee.201606135
[12]	MAKINO T, TAKANO H, KAMIYA T, et al.Restoration of cadmium-contaminated paddy soils by washing with ferric chloride: Cd extraction mechanism and bench-scale verification[J].Chemosphere, 2008, 70(6): 1035-1043 10.1016/j.chemosphere.2007.07.080
[13]	CHEN C, TIAN T, WANG M K, et al.Release of Pb in soils washed with various extractants[J].Geoderma, 2016, 275: 74-81 10.1016/j.geoderma.2016.04.015
[14]	许端平, 李晓波, 王宇, 等.FeCl3-柠檬酸对土壤中Pb和Cd淋洗动力学特征[J]. 环境工程学报, 2016, 10(11): 6753-6760 10.12030/j.cjee.201506158
[15]	冯静, 张增强, 李念, 等. 铅锌厂重金属污染土壤的螯合剂淋洗修复及其应用[J]. 环境工程学报, 2015, 9(11): 5617-5625
[16]	黄川, 李柳, 黄珊, 等. 重金属污染土壤的草酸和EDTA混合淋洗研究[J]. 环境工程学报, 2014, 8(8): 3480-3486
[17]	GAO R, ZHU P, GUO G, et al.Efficiency of several leaching reagents on removal of Cu, Pb, Cd, and Zn from highly contaminated paddy soil[J].Environmental Science and Pollution Research, 2016, 23(22): 23271-23280
[18]	机酸对土壤中Pb和Cd淋洗动力学特征及去除机理[J]. 安全与环境学报, 2015, 15(3): 261-266
[19]	于颖, 周启星. 重金属铜在黑土和棕壤中解吸行为的比较[J]. 环境科学, 2004, 25(1): 128-132
[20]	邓红侠, 杨亚莉, 李珍, 等. 不同条件下皂苷对污染塿土中Cu、Pb的淋洗修复[J]. 环境科学, 2015, 36(4): 1445-1452
[21]	林青, 徐绍辉. 土壤中重金属离子竞争吸附的研究进展[J].土壤, 2008, 40(5):706-711
[22]	许超, 夏北城, 林颖.EDTA和柠檬酸对污染土壤中重金属的解吸动力学及其形态的影响[J]. 水土保持学报, 2009, 23(4): 146-151
[23]	SUN B, ZHAO F J, LOMBI E, et al.Leaching of heavy metals from contaminated soils using EDTA[J].Environmental Pollution, 2001, 113(2): 111-120 10.1016/S0269-7491(00)00176-7
[24]	YANG Z, ZHANG S, LIAO Y, et al.Remediation of heavy metal contamination in calcareous soil by washing with reagents: Acolumn washing[J].Procedia Environmental Sciences, 2012, 16: 778-785
[25]	向玥皎, 刘阳生. 柠檬酸、草酸对污染土壤中铅锌的静态浸提实验研究[J]. 环境工程, 2015, 33(9): 153-157
[26]	GUO X, WEI Z, WU Q, et al.Effect of soil washing with only chelators or combining with ferric chloride on soil heavy metal removal and phytoavailability: Field experiments[J].Chemosphere, 2016, 147: 412-419 10.1016/j.chemosphere.2015.12.087
[27]	UDOVIC M, LESTAN D.Pb, Zn and Cd mobility, availability and fractionation in aged soil remediated by EDTA leaching[J].Chemosphere, 2009, 74(10): 1367-1373 10.1016/j.chemosphere.2008.11.013
[28]	CHEN C, CHEN Y, XIE T, et al.Removal, redistribution, and potential risks of soil Cd, Pb, and Zn after washing with various extractants[J].Environmental Science and Pollution Research, 2015, 22(21): 16881-16888
[29]	李玉双, 胡晓钧, 宋雪英, 等. 柠檬酸对重金属复合污染土壤的淋洗修复效果与机理[J]. 沈阳大学学报(自然科学版) , 2012, 24(2): 6-9
[30]	WU L H, LUO Y M, CHRISTIE P, et al.Effects of EDTA and low molecular weight organic acids on soil solution properties of a heavy metal polluted soil[J].Chemosphere, 2003, 50(6): 819-822 10.1016/S0045-6535(02)00225-4
[31]	周玲玲, 张永吉, 孙丽华, 等. 铁盐和铝盐混凝对水中天然有机物的去除特性研究[J]. 环境科学, 2008, 29(5): 1187-1191
[32]	YI Y M, SUNG K.Influence of washing treatment on the qualities of heavy metal-contaminated soil[J].Ecological Engineering, 2015, 81(1): 89-92 10.1016/j.ecol

PDF下载( 3136 KB)XML下载导出引用Turn off MathJax -->
点击查看大图

计量

文章访问数:1230
HTML全文浏览数:1056
PDF下载数:202
施引文献:0

出版历程

刊出日期:2018-10-11

---

-->

不同化学淋洗剂对复合重金属污染土壤的修复机理

陈欣园^1,,
仵彦卿¹
1.上海交通大学环境科学与工程学院，上海 200240
基金项目: 国家自然科学基金资助项目（41272261）
关键词: 重金属污染土壤/
EDTA/
柠檬酸/
FeCl3/
修复机理
摘要:化学淋洗技术是一种常用的重金属污染土壤修复技术，化学淋洗剂的选择尤为重要。以乙二胺四乙酸二钠（EDTA）、柠檬酸（CA）和三氯化铁（FeCl3）为化学淋洗剂，采用振荡淋洗法研究淋洗时间与淋洗剂浓度对Cu、Zn、Pb和Cd去除效果的影响，分析重金属污染土壤淋洗前后重金属形态与基本理化性质的变化。结果表明：3种化学淋洗剂对重金属的快速反应阶段基本在60 min内，在240 min达到淋洗平衡，对Pb和Cd的淋洗主要是非均相扩散过程；EDTA、柠檬酸和FeCl3对重金属的去除能力依次为Pb>Cd>Cu>Zn，Cd>Zn>Cu>Pb与Pb≈Cd>Cu>Zn，EDTA的淋洗效率最高，Cd的解吸能力最强；EDTA和FeCl3可有效去除弱酸可溶态与可还原态重金属，柠檬酸能有效去除弱酸可溶态重金属，修复后的土壤仍有环境风险；3种淋洗剂修复后的土壤中总有机碳与粒径分布无明显变化，FeCl3会酸化土壤。综合考虑，EDTA、柠檬酸和FeCl3均为淋洗效果好的环境友好型化学淋洗剂，该研究成果可用于现场淋洗去除土壤中重金属的小试。

English Abstract

全文HTML

--> --> --> 参考文献 (32)