Rapid control of black and odorous substances from heavily-polluted sediment by oxidation: Efficiency and effects

Abstract

Oxidants were proposed to rapidly control black and odorous substances in sediments.

NaClO and KMnO₄ had excellent efficiency to remove black and odorous substances.

NaClO dramatically accelerated the release of organics, NH₄⁺-N, P, and heavy-metals.

Moderate oxidation had a limited effect on microbial communities.

NaClO of 0.2 mmol/g was viewed to be the optimum option.

The control of black and odorous substances in sediments is of crucial importance to improve the urban ecological landscape and to restore water environments accordingly. In this study, chemical oxidation by the oxidants NaClO, H₂O₂, and KMnO₄ was proposed to achieve rapid control of black and odorous substances in heavily-polluted sediments. Results indicate that NaClO and KMnO₄ are effective at removing Fe(II) and acid volatile sulfides. The removal efficiencies of Fe(II) and AVS were determined to be 45.2%, 94.1%, and 93.7%, 89.5% after 24-h exposure to NaClO and KMnO₄ at 0.2 mmol/g, respectively. Additionally, rapid oxidation might accelerate the release of pollutants from sediment. The release of organic matters and phosphorus with the maximum ratios of 22.1% and 51.2% was observed upon NaClO oxidation at 0.4 mmol/g. Moreover, the introduction of oxidants contributed to changes in the microbial community composition in sediment. After oxidation by NaClO and KMnO₄ at 0.4 mmol/g, the Shannon index decreased from 6.72 to 5.19 and 4.95, whereas the OTU numbers decreased from 2904 to 1677 and 1553, respectively. Comparatively, H₂O₂ showed a lower effect on the removal of black and odorous substances, pollutant release, and changes in sediment microorganisms. This study illustrates the effects of oxidant addition on the characteristics of heavily polluted sediments and shows that chemical oxidants may be an option to achieve rapid control of black and odorous substances prior to remediation of water environments.

Graphical abstract

Keywords

Oxidants / Heavily polluted sediment / Black and odorous substances / Release behaviors / Microorganism

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