考虑温度电动淋洗法去除污染软土中铬试验研究

郑佳挺; 刘立馗; 王爱骅; 王艳; 刘干斌

doi:10.16030/j.cnki.issn.1000-3665.202010056

考虑温度电动淋洗法去除污染软土中铬试验研究

1.
宁波大学土木与环境工程学院，浙江宁波　315211

2.
中建三局工程设计有限公司，湖北武汉　430074

基金项目: 国家自然科学基金项目（51678311）；浙江省自然科学基金项目（LY19E080011）；宁波市社发重大项目（2017C510002）

详细信息

作者简介: 郑佳挺（1996-），男，硕士研究生，主要从事环境岩土工程研究。E-mail：2860508162@qq.com

通讯作者: 王艳（1985-），女，博士，副教授，主要从事环境岩土工程研究。E-mail：wangyan@nbu.edu.cn

中图分类号: P614.69

收稿日期: 2020-10-09

修回日期: 2020-11-20

刊出日期: 2021-11-15

An experimental study of removal of chromium from contaminated soft soil with the electrokinetic soil flushing method considering temperature and low voltage

1.
School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang　315211, China

2.
China Construction Third Bureua Engineering Design Co. Ltd., Wuhan, Hubei　430074, China

More Information

Corresponding author: WANG Yan, wangyan@nbu.edu.cn

Received Date: 09 October 2020

Revised Date: 20 November 2020

Publish Date: 15 November 2021

摘要

摘要:
针对铬污染软土，自行设计了电动淋洗试验装置，开展了铬污染软土室内土柱淋洗试验，分析了试验过程中电流、电解质溶液pH的变化以及淋洗液种类、外加电压、温度对重金属铬去除特性的影响。结果表明：电动淋洗试验可以有效去除土壤中的重金属铬；相对于单一淋洗试验，用10 V电压强化淋洗试验显著提高了重金属铬去除效果，淋洗液为十二烷基苯磺酸钠（SDS）时Cr（VI）和Cr（总）去除效率是单一淋洗法的2.79，3.12倍。当电压为10 V，温度升高至45 ℃时，淋洗液为柠檬酸（CA）和草酸（OA）的各组试验表明Cr（Ⅵ）与Cr（总）去除率均相应提高；而淋洗液为十二烷基苯磺酸钠时的试验组中Cr（VI）去除率提高了5.84%，Cr（总）去除率降低了4.25%，表明升高温度使部分Cr（VI）还原成不易迁移的Cr（III）；淋洗液为草酸的试验组中升高温度时Cr（Ⅵ）与Cr（总）去除率最高，分别达到了82.08%、77.57%，分别相应提高了27.65%、26.01%。电动淋洗试验后，铬污染软土土粒结构变得更紧密，土粒之间的孔隙减小且被填充的更加密实。
- 电动淋洗 /
- 污染软土 /
- 铬 /
- 修复 /
- 温度
Abstract:
A series of column tests of chromium-contaminated soft soil were performed in lab using self-designed electrokinetic soil flushing apparatus considering temperature. The changes of the current and electrolyte solution pH, and the effects of the type of leaching agent (i.e. sodium dodecylbenzene sulfonate, citric acid and oxalic acid), applied voltage and temperature on the removal behavior of chromium were analyzed. The results show that chromium in soil can be removed effectively with the electrokinetic soil flushing method. Compared with the single soil flushing method using sodium dodecylbenzene sulfonate (SDS), the removal ratio of Cr(VI) and Cr(total) can increase to 2.79 and 3.12 times when the voltage of 10 V is applied. When the raising temperature increases to 45 ℃, the removal ratio of Cr(VI) and Cr(total) both are greatly improved as citric acid (CA) and oxalic acid (OA) are leaching agents, while the removal ratio of Cr(total) decreases by 4.25% when using SDS as leaching agent. The group using oxalic acid as leaching agent shows the best removal efficiency, and the removal ratio of Cr(VI) and Cr(total) reach 82.08% and 77.57%, respectively. After remediation, the soil structure has changed, and pores between soil particles become smaller and the soils are more compacted.
- electrokinetics /
- contaminated soft soil /
- chromium /
- remediation /
- temperature

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图 1 试验装置示意图

Figure 1.

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图 2 电流随时间变化

Figure 2.

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图 3 淋出液收集室和淋洗室pH随时间变化

Figure 3.

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图 4 土样微观结构图像

Figure 4.

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表 1 试验分组

Table 1. Experimental groups

编号	淋洗液种类	电压/V	温度/℃
SF	0.5%KCl	0	5
SF-SDS	0.5%KCl、0.5%SDS	0	5
SFEK-SDS	0.5%KCl、0.5%SDS	10	5
SFEK45-SDS	0.5%KCl、0.5%SDS	10	45
SF-CA	0.5%KCl、0.5%CA	0	5
SFEK-CA	0.5%KCl、0.5%CA	10	5
SFEK45-CA	0.5%KCl、0.5%CA	10	45
SF-OA	0.5%KCl、0.5%OA	0	5
SFEK-OA	0.5%KCl、0.5%OA	10	5
SFEK45-OA	0.5%KCl、0.5%OA	10	45
注：淋洗液浓度为质量浓度。

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表 2 土柱中Cr（Ⅵ）、Cr（总）残余浓度及能耗

Table 2. Residual concentration of Cr（VI）and Cr（total）in soil columns and energy consumption

编号		浓度/（mg·kg⁻¹）					去除率/%	能耗/ （10⁻³ kW·h）	消耗电能E/（kW·h·kg⁻¹）	淋出液Cr （总）浓度/ （mg·kg⁻¹）
编号		1	2	3	4	5	去除率/%	能耗/ （10⁻³ kW·h）	消耗电能E/（kW·h·kg⁻¹）	淋出液Cr （总）浓度/ （mg·kg⁻¹）
SF	Cr（Ⅵ）	1111	1123	1072	999	862	13.88	−	−	5.2
SF	Cr（总）	1298	1311	1377	1277	1011	10.37	−	−	5.2
SF-SDS	Cr（Ⅵ）	969.6	932.4	1022.4	1026	529.2	25.34	−	−	9.44
SF-SDS	Cr（总）	1066.8	1212	1344	1192.8	624	22.29	−	−	9.44
SFEK-SDS	Cr（Ⅵ）	501	511	372	201	180	70.58	3.06	14.96	33.98
SFEK-SDS	Cr（总）	535	531	466	386	211	69.59	3.06	14.96	33.98
SFEK45-SD	Cr（Ⅵ）	304	448	377	267	227	74.70	4.47	22.82	34.12
SFEK45-SD	Cr（总）	410	619	617	477	213	66.63	4.47	22.82	34.12
SF-CA	Cr（Ⅵ）	936	943.2	951.6	918	579.6	27.86	−	−	11.78
SF-CA	Cr（总）	967.2	1197.6	1184.4	957.6	825.6	26.68	−	−	11.78
SFEK-CA	Cr（Ⅵ）	510	613	599	390	227	61.02	2.40	15.12	24.22
SFEK-CA	Cr（总）	533	654	896	740	397	54	2.40	15.12	24.22
SFEK45-CA	Cr（Ⅵ）	498	362	316	279	162	74.05	2.91	17.25	26.9
SFEK45-CA	Cr（总）	662	695	739	599	288	57.39	2.91	17.25	26.9
SF-OA	Cr（Ⅵ）	961.2	1054.8	879.6	932.4	493.2	27.98	−	−	14.15
SF-OA	Cr（总）	1016.4	1114.8	926.4	967.2	589.2	34.09	−	−	14.15
SFEK-OA	Cr（Ⅵ）	638	482	552	303	167	64.3	2.97	16.41	26.78
SFEK-OA	Cr（总）	766	497	808	307	313	61.56	2.97	16.41	26.78
SFEK45-OA	Cr（Ⅵ）	298	274	218	187	98	82.08	2.46	10.79	42.3
SFEK45-OA	Cr（总）	388	355	339	290	198	77.57	2.46	10.79	42.3

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