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ORIGINAL RESEARCH article
Front. Mar. Sci.
Sec. Marine Pollution
Volume 12 - 2025 |
doi: 10.3389/fmars.2025.1550274
This article is part of the Research Topic Fate and Effects of Sediment and Emerging Pollutants in Marine and Estuarine Environments View all articles
Evaluation of extraction-oxidation synergistic remediation of contaminated dredged sediment and plant suitability effects
Provisionally accepted- 1 National Marine Environmental Monitoring Center, Dalian, China
- 2 Dalian Maritime University, Dalian, Liaoning Province, China
Generally, marine dredged sediments often exhibit co-pollution with heavy metals and petroleum hydrocarbons. This work investigates the extraction-oxidation synergistic remediation treatment of heavy metals (Cu and Pb) and total petroleum hydrocarbon (TPH) in the contaminated dredged sediments. The leachability of heavy metals, the oxidation of TPH, the physicochemical properties of the treated sediment, and the fertility of the treated sediment for barley growth are compared among different combinations of extractants (ethylene diamine tetraacetic acid (EDTA), citric acid (CA) and ferric chloride (FeCl3)) and oxidant (potassium persulfate (K2S2O8)). The results show that the extraction-oxidation synergistic remediation treatment significantly reduces the Cu and Pb contents. The total removal performances of heavy metals and TPH in the contaminated dredged sediments by each co-remediation treatment group are FeCl3+Ox > EDTA-Ox > CA-Ox. Specifically, FeCl3+Ox and EDTA-Ox achieve the highest removal rates of 91.10% and 96.95% for Cu and Pb, respectively. The extractant affects the activation of K2S2O8 by transition metals, enhancing the removal efficiency of TPH. The EDTA-Ox treatment group demonstrates the optimal treatment efficiency (37.42%) for TPH in the dredged sediment in 30 min. In the barley planting experiment, both shoot and root germinations in the EDTA-Ox treatment group reach their maximum values of 100% and 90%, respectively. Additionally, the CA-Ox treatment group exhibits maximal shoot and root lengths of 11.6 cm and 12.1 cm, respectively. The stress caused by salinity on seeds is also mitigated by the treatment. This study can provide technical support for the beneficial use of the dredged sediment.
Keywords: Marine dredged sediment, Co-contamination, Chemical extraction, chemical oxidation, Barley growth
Received: 23 Dec 2024; Accepted: 23 Jan 2025.
Copyright: © 2025 Yang, Liu, Sun, Zhaowei, Han and Han. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Wenchao Yang, National Marine Environmental Monitoring Center, Dalian, China
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