Assessment of Calcium Nitrate Addition on the AVS Removal, Phosphorus Locking, and Pb Release in Sediment

Recently, calcium nitrate (CN) has been widely used in contaminated sediments remediation. However, the release of NO 3 − –N, NO 2 − –N, and Pb into the overlying water accompanying with the addition of CN may cause a toxic threat to the water ecosystem. Herein, this study investigated the effect of...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2021-12, Vol.232 (12), Article 501
Main Authors: Li, Lanmiao, Wu, Linjun, Huang, Yanchun, Li, Yintian, Liu, Chao, Li, Jun, Li, Naiwen
Format: Article
Language:English
Subjects:
Atmospheric Protection/Air Quality Control/Air Pollution
Calcium
Calcium ions
Calcium nitrate
Climate Change/Climate Change Impacts
Contaminated sediments
Denitrification
Earth and Environmental Science
Environment
Environmental monitoring
Ethylenediaminetetraacetic acid
Hydrogeology
Iron
Lead
Locking
Methylene blue
Nitrates
Nitrogen dioxide
Oxidation
Oxidation-reduction potential
Phosphorus
Phosphorus removal
Redox potential
Remediation
Removal
Sediment
Sediment pollution
Sediments
Sediments (Geology)
Soil Science & Conservation
Sulfides
Sulphides
Water Quality/Water Pollution
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Summary:Recently, calcium nitrate (CN) has been widely used in contaminated sediments remediation. However, the release of NO 3 − –N, NO 2 − –N, and Pb into the overlying water accompanying with the addition of CN may cause a toxic threat to the water ecosystem. Herein, this study investigated the effect of CN addition dosages on the sediment remediation, including oxidation-reduction potential (ORP), acid-volatile sulfide (AVS), phosphorus, nitrogen, and Pb. Results showed that, with the increase of CN addition ratio from 0.5× to 2.0× (from 0.5 to 2.0 times the theoretical CN dosage, based on autotrophic sulfide-driven denitrification), the ORP, AVS, and Fe (II) removal rates had a significant improvement. Moreover, due to the abundant Ca 2+ and the oxidization of Fe (II), it would make O–P transformed to Ca–P and Fe/Al–P, which lead to the locking of phosphorus in sediments. However, this study indicated that the more CN added, the more NO 3 − –N, NO 2 − –N, and Pb 2+ released in the overlying water. In addition, the increase of exchangeable Pb and oxidizable fraction Pb in sediments were characterized, which had a positive correlation with CN dosages ( p  
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-021-05453-0