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

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Abstract

Recently, calcium nitrate (CN) has been widely used in contaminated sediments remediation. However, the release of NO3–N, NO2–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 Ca2+ 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 NO3–N, NO2–N, and Pb2+ 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 < 0.01). Thus, secondary pollution needs to be considered for sediment remediation, and adding nitrate directly into sediments may not be suitable for natural water bodies.

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Some data generated or analyzed during this study are included in this published article and its supplementary information files. The other raw or processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgements

The authors would like to acknowledge the financial support from the Major Scientific and Technological Special Program of Sichuan Province, China (2018SZDZX0027 and 2019-YF09-00081-SN).

Funding

This study was funded by Major Scientific and Technological Special Program of Sichuan Province, China (2018SZDZX0027 and 2019-YF09-00081-SN).

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Naiwen Li and Chao Liu contributed to the conception of the study and provided financial support. Lanmiao Li and Linjun Wu performed the experiment. Lanmiao Li, Yanchun Huang and Yintian Li contributed significantly to analysis and manuscript preparation. Lanmiao Li performed the data analyses and wrote the manuscript. Jun Li and Naiwen Li helped perform the analysis with constructive discussions. All authors read and approved the final manuscript.

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Correspondence to Naiwen Li.

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Li, L., Wu, L., Huang, Y. et al. Assessment of Calcium Nitrate Addition on the AVS Removal, Phosphorus Locking, and Pb Release in Sediment. Water Air Soil Pollut 232, 501 (2021). https://doi.org/10.1007/s11270-021-05453-0

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  • DOI: https://doi.org/10.1007/s11270-021-05453-0

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