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- Title
The effect of microenvironment in the sediment on phosphorus immobilization under capping with ACPM and Phoslock®.
- Authors
Song, Xiaojun; Li, Dapeng; Zhao, Zhehao; Zhou, Jing; Xu, Chutian; Geng, Xue; Huang, Yong
- Abstract
Currently, in situ capping is a typical popular geoengineering method for eutrophication control. It is crucial to better understand the effect of microenvironment change due to capping, such as amended calcium peroxide material (ACPM) and Phoslock®, on phosphorus (P) adsorption and immobilization under the addition of external P. The microenvironment in sediment was presented by the concentration of O2, NH4+, and Fe2+ and microbial activity. The P removal and immobilization were also analyzed. The results show that the stronger oxidation in the microenvironment under the capping with ACPM was due to the higher reduction of NH4+ and Fe2+ and the higher increase of microbial activity, compared to Phoslock®. Although, under the capping of ACPM, less amount of external P was removed and there was a faster release of sedimentary P, compared to Phoslock®, ACPM improved the transformation of P from mobile P fractions to inert P fractions. In addition, sedimentary P under the capping of ACPM presents less release than that under the capping of Phoslock® during the anaerobic incubation. However, the settlement of suspended solids decreased the function of capping. All these results indicated that the mechanism of P removal and immobilization was different under the capping of ACPM and Phoslock®.
- Subjects
EUTROPHICATION control; SUSPENDED solids; PHOSPHORUS in water; SEDIMENTS; PHOSPHORUS
- Publication
Environmental Science & Pollution Research, 2020, Vol 27, Issue 13, p15440
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-020-08105-8