NDLI: Assessment of Acid Enhancement Schemes for Electrokinetic Remediation of Cd/Pb Contaminated Soil

Content Provider	Springer Nature Link
Author	Zhang, Peng Jin, Chunji Sun, Zefeng Huang, Guohe She, Zonglian
Copyright Year	2016
Abstract	Electrokinetic remediation technology is an effective method for treating soils contaminated by heavy metals. However, for natural soils with a high acid/base buffer capacity, the efficiency of removal decreases and the cost of treatment increase. A novel acid enhancement method that anode approaching electrokinetic remediation was investigated in this study. For assessing the new method, four types of electrokinetic remediation methods were designed for treatment of cadmium and lead contaminated soil: traditional, acetic acid pH control, citric acid pH control, and anode approaching electrokinetic remediation. The traditional method has the lowest removal rates and cost. Acid added method not only enhanced the removal of heavy metal dramatically but also increased cost correspondingly. Removal rate of the whole soil body of the anode approaching method only achieved 25.93 % for cadmium and 31.27 % for lead, which was higher than that obtained with an traditional electrokinetic method (by 17.96 and 30.40 %, respectively). However, more and more metal were forced to accumulate near the cathode in the anode approaching method so that the removal rates of cadmium and lead in the first four segments of the soil are 92.44 and 60.70 %, respectively. The cost of this treatment (primarily the cost of electricity and acid consumption) is much lower than that of the acid added method. Although the acid added method has highest removal efficiency, the anode approaching method has cost advantage. And mechanism of the new method was discussed in terms of experiment data. In addition, anode approaching method has not added other chemicals to avoid potential effect during running.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	227
Issue Number	6
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-05-31
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrokinetic remediation Acetic acid Citric acid Anode approaching method Compound pollution of cadmium and lead Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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