Algal settlement inactivates lanthanum/aluminum comodified attapulgite: implications for phosphorus control in shallow lakes

Kong, M, Han, T, Yin, H, Xu, X, Zhang, T, Chen, T, Pan, G ORCID: https://orcid.org/0000-0003-0920-3018, Shi, W and Wei, D, 2022. Algal settlement inactivates lanthanum/aluminum comodified attapulgite: implications for phosphorus control in shallow lakes. ACS ES & T Water. ISSN 2690-0637

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Abstract

Phosphorus (P) inactivation agents have been widely used to control sediment P release for combating lake eutrophication. The settlement and decomposition of algal biomass from the overlying water can alter the microenvironment of the capping layer and potentially affect the performance of P inactivation agents. In this study, we explored the impacts of algal decomposition on the performance of lanthanum/aluminum comodified attapulgite (LAA), a commonly used P inactivation agent, and the underlying mechanisms through incubation experiments. The results showed that algal settlement and decomposition could inactivate LAA. After algal settlement, the amount of P locked in the LAA decreased by 11.8% relative to the control. Algal decomposition induced anoxia in the capping layer of LAA, which favored the growth of phosphate-solubilizing bacteria, thereby enhancing P release; meanwhile, driven by algal decomposition, more organic matter penetrated the capping layer and competed with P adsorption sites. The increased desorption ability and decreased adsorption ability inhibited the performance of LAA, increasing the P permeability of the capping layer. This study provides beneficial information for future field applications of P inactivation agents for lake restoration.

Item Type:	Journal article
Publication Title:	ACS ES & T Water
Creators:	Kong, M., Han, T., Yin, H., Xu, X., Zhang, T., Chen, T., Pan, G., Shi, W. and Wei, D.
Publisher:	American Chemical Society
Date:	7 March 2022
ISSN:	2690-0637
Identifiers:	Number Type 10.1021/acsestwater.1c00334 DOI WT1525166 Other
Rights:	This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS ES &T Water, copyright © 2022 American Chemical Society after peer review and technical editing by the publisher.
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Jonathan Gallacher
Date Added:	14 Mar 2022 13:26
Last Modified:	07 Mar 2023 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/45882

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