期刊
JOURNAL OF MARINE SCIENCE AND ENGINEERING
卷 10, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/jmse10050636
关键词
marine sediment pollution; environmental remediation; natural organic acid; batch experiments; ports and waterways
资金
- National Natural Science Foundation of China [52001042]
- National Key Research and Development Program of China [2021YFB2601100]
- List of Key Transportation Science and Technology Projects [2020-MS4-108]
- Innovation and Entrepreneurship Projects for High-Level Talents of Dalian [2020RQ015]
- State Environmental Protection Key Laboratory of Marine Ecosystem Restoration [202104]
- State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology [LP 2008]
This study aimed to remove heavy metals from contaminated dredged sediments using natural organic acids. The results showed that citric acid had the best leaching effect and could serve as an effective and environmentally friendly leaching agent.
There are more than 150 ports in China and a considerable proportion of dredged sediments in ports and waterways are contaminated with heavy metals as the typical contaminants. It is mandatory to remediate the contaminated dredged sediments prior to further resource utilization. The over-arching objective of this study was to use natural organic acids (oxalic acid, citric acid, tartaric acid, and malic acid) as leaching agents to remove heavy metals (Cu, Cd, and Pb) from contaminated dredged sediments. Batch experiments were conducted to investigate the factors governing the removal rate of heavy metals and leaching kinetics. Citric acid had the best leaching effect on heavy metals Cu, Cd, and Pb with an optimal leaching concentration of 20 mmol/L and a solid-to-liquid ratio of 1:20. The average removal rates of Cu, Cd, and Pb were 85%, 73%, 56%, and 35% for citric acid, malic acid, tartaric acid, and oxalic acid, respectively. The leaching kinetics showed that the removal of heavy metals increased rapidly with time and then gradually reached the maximum value which was best described by the Elovich equation model. The outcomes of this study suggest that citric acid is an effective and environmentally friendly leaching agent for removing heavy metals from marine dredged sediments.
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