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Effects of different chemical agents on changes in sediment phosphorus composition and the response of sediment microbial community.
- Source :
-
Journal of Environmental Management . Sep2023, Vol. 342, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Controlling the release of sediment phosphorus (P) using chemical agents is a promising method for controlling internal P in eutrophic lakes. However, mineral P formation and changes in the organic P composition after sediment amendment with P-inactivation agents remain poorly understood. Furthermore, little is known about the changes in the sediment microbial community composition after remediation. Here, various ratios of poly aluminum chloride (PAC) and lanthanum-modified bentonite (LMB) were added to nutrient-rich sediments and incubated. Sequential P extraction, solution/solid-state 31P nuclear magnetic resonance (NMR), and microbial analyses were periodically performed on the inactivated sediments. The results indicate that PAC and LMB effectively reduced sediment iron-bound P and organic P, respectively, markedly increasing the content of aluminum- and calcium-bound P in the sediment, respectively. Solid-state 31P NMR results confirmed the formation of rhabdophane (LaPO 4. nH 2 O) in the LMB-amended sediment. Solution 31P NMR results showed that PAC preferentially reduced the organic P fractions of pyrophosphate, whereas LMB efficiently reduced the organic P fractions of orthophosphate, monoesters, and diesters in the sediment. Compared with the control sediment, PAC addition can cause short-term negative effects on sediment microbes at high doses, whereas LMB addition can increase bacterial diversity or richness in the sediment. These results provide a deeper understanding of the differences between PAC and LMB in internal sediment P control. [Display omitted] • PAC and LMB can control mobile P, but induce different P composition in sediment. • Solid state 31P NMR confirmed formation of rhabdophane in LMB amended sediment. • PAC prefer to reduce pyro-P, but LMB reduce other sediment organic P efficiently. • PAC decrease sediment microbial diversity shortly, but LMB behave the opposite. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03014797
- Volume :
- 342
- Database :
- Academic Search Index
- Journal :
- Journal of Environmental Management
- Publication Type :
- Academic Journal
- Accession number :
- 164378858
- Full Text :
- https://doi.org/10.1016/j.jenvman.2023.118321