Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

doi:10.1016/j.cjche.2017.10.012

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (5): 1152-1159.DOI: 10.1016/j.cjche.2017.10.012

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

Yingying Gu¹, Albert T. Yeung^2,4, Hongjiang Li³

1 Department of Environmental and Safety Engineering, China University of Petroleum(East China), Qingdao 266580, China;
2 Department of Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;
3 Qingdao Water Group Co. Ltd., Qingdao 266002, China;
4 College of Mining Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2017-09-02 Revised:2017-10-18 Online:2018-06-29 Published:2018-05-28
Contact: Yingying Gu,E-mail address:yingyinggu@upc.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China (41201303), Shandong Province Natural Science Foundation, China (ZR2017QEE016), the Fundamental Research for the Central Universities (14CX02191A, 17CX02075), and State Key Laboratory of Pollution Control and Resource Reuse Foundation (PCRRF13023).

Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

Yingying Gu¹, Albert T. Yeung^2,4, Hongjiang Li³

1 Department of Environmental and Safety Engineering, China University of Petroleum(East China), Qingdao 266580, China;
2 Department of Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;
3 Qingdao Water Group Co. Ltd., Qingdao 266002, China;
4 College of Mining Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China

通讯作者: Yingying Gu,E-mail address:yingyinggu@upc.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (41201303), Shandong Province Natural Science Foundation, China (ZR2017QEE016), the Fundamental Research for the Central Universities (14CX02191A, 17CX02075), and State Key Laboratory of Pollution Control and Resource Reuse Foundation (PCRRF13023).

Abstract

Abstract: Soil contamination by metals is a worldwide environmental problem. Electrokinetic extraction is a promising technology for in-situ remediation of contaminated soils of low hydraulic permeability. However, the extraction of metals is usually hindered by the high buffer capacity of natural soils. Organophosphonates are strong metal chelates as ethylenediaminetetraacetic acid (EDTA) which has been widely studied in the enhancement of electrokinetic remediation. In this study, batch desorption experiments and bench-scale electrokinetic extraction experiments were carried out to study the effect of two organophosphonates, i.e., (nitrilotrimethylene)triphosphonate (NTMP) & (ethylenedinitrilo)-tetramethylenephosphonate (EDTMP), on the extraction of cadmium from a natural clay in comparison with EDTA. Results of the batch desorption experiments showed that more than 75% of the sorbed cadmium could be dissolved into solution using 0.1 mol·L^-1 organophosphonates or EDTA in the wide pH range of 1-11. Results of the electrokinetic extraction experiments showed that the cadmium spiked in the specimen migrated towards the anode with the enhancement of NTMP, EDTMP, and EDTA under a constant voltage gradient of approximately 1.0 V·cm^-1. Although cadmium mobilization enhanced by EDTA was more efficient than that by the organophosphonates, accumulation of cadmium was observed in the vicinity of the anode. The average removal efficiencies of cadmium from the soil after approximately 5 days of electrokinetic extraction enhanced by 0.1 mol·L^-1 NTMP (22.8%) and EDTMP (22.4%) were higher than that by 0.1 mol·L^-1 EDTA (15.1%).

Key words: Electrochemistry, Remediation, Desorption, Organophosphonate, EDTA, High buffer capacity

摘要： Soil contamination by metals is a worldwide environmental problem. Electrokinetic extraction is a promising technology for in-situ remediation of contaminated soils of low hydraulic permeability. However, the extraction of metals is usually hindered by the high buffer capacity of natural soils. Organophosphonates are strong metal chelates as ethylenediaminetetraacetic acid (EDTA) which has been widely studied in the enhancement of electrokinetic remediation. In this study, batch desorption experiments and bench-scale electrokinetic extraction experiments were carried out to study the effect of two organophosphonates, i.e., (nitrilotrimethylene)triphosphonate (NTMP) & (ethylenedinitrilo)-tetramethylenephosphonate (EDTMP), on the extraction of cadmium from a natural clay in comparison with EDTA. Results of the batch desorption experiments showed that more than 75% of the sorbed cadmium could be dissolved into solution using 0.1 mol·L^-1 organophosphonates or EDTA in the wide pH range of 1-11. Results of the electrokinetic extraction experiments showed that the cadmium spiked in the specimen migrated towards the anode with the enhancement of NTMP, EDTMP, and EDTA under a constant voltage gradient of approximately 1.0 V·cm^-1. Although cadmium mobilization enhanced by EDTA was more efficient than that by the organophosphonates, accumulation of cadmium was observed in the vicinity of the anode. The average removal efficiencies of cadmium from the soil after approximately 5 days of electrokinetic extraction enhanced by 0.1 mol·L^-1 NTMP (22.8%) and EDTMP (22.4%) were higher than that by 0.1 mol·L^-1 EDTA (15.1%).

关键词: Electrochemistry, Remediation, Desorption, Organophosphonate, EDTA, High buffer capacity

Yingying Gu, Albert T. Yeung, Hongjiang Li. Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA[J]. Chin.J.Chem.Eng., 2018, 26(5): 1152-1159.

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Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

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