Remediation Techniques for Cadmium-Contaminated Dredged River Sediments after Land Disposal

Changsong Zhang, Xueke Zang, Zhenxue Dai, Xiaoying Zhang and Ziqi Ma
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Changsong Zhang: Shanghai Institute of Geological Engineering Exploration Institute of Environmental Geotechnics, Shanghai 200436, China
Xueke Zang: Shanghai Institute of Geological Engineering Exploration Institute of Environmental Geotechnics, Shanghai 200436, China
Zhenxue Dai: College of Construction Engineering, Jilin University, Changchun 130012, China
Xiaoying Zhang: College of Construction Engineering, Jilin University, Changchun 130012, China
Ziqi Ma: College of Construction Engineering, Jilin University, Changchun 130012, China

Sustainability, 2021, vol. 13, issue 11, 1-13

Abstract: This paper examines the remediation techniques of cadmium (Cd)-contaminated dredged river sediments after land disposal in a city in East China. Three remediation techniques, including stabilization, soil leaching, and phytoremediation, are compared by analyzing the performance of the techniques for Cd-contaminated soil remediation. The experimental results showed that the stabilization technique reduced the leaching rate of soil Cd from 33.3% to 14.3%, thus effectively reducing the biological toxicity of environmental Cd, but the total amount of Cd in soil did not decrease. Leaching soil with citric acid and oxalic acid achieved Cd removal rates of 90.1% and 92.4%, respectively. Compared with these two remediation techniques, phytoremediation was more efficient and easier to implement and had less secondary pollution, but it took more time, usually several years. In this study, these three remediation techniques were analyzed and discussed from technical, economic, and environmental safety perspectives by comprehensively considering the current status and future plans of the study site. Soil leaching was found to be the best technique for timely treatment of Cd contamination in dredged river sediments after land disposal.

Keywords: sediments; cadmium contamination; stabilization for soil remediation; soil leaching; phytoremediation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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