Effects of riverine suspended particulate matter on the post-dredging increase in internal phosphorus loading across the sediment-water interface

Environmental Pollution
Cheng LiuQilin Zhou

Abstract

Dredging is frequently used in the river mouths of eutrophic lakes to reduce internal phosphorus (P) loading from the sediment. However, the accumulation of P-adsorbed suspended particulate matter (SPM) from the inflowing rivers negatively affects the post-dredging sediment-water interface and ultimately increases internal P loading. Here, a 360-d experiment was carried out to investigate the influence of riverine SPM on the efficacy of dredging in reducing internal P loading. SPM was added to dredged and undredged sediments collected from the confluence area of Lake Chaohu. Several parameters related to internal P loading, including oxygen profile, soluble reactive P, and ferrous iron across the sediment-water interface, organic matter, alkaline phosphatase activity, and P fractions, were measured throughout the experimental period. The results showed that the P content (especially mobile P) in the sediment increased to the pre-dredging level with the accumulation of SPM in the dredged sediment. In addition, the P flux across the sediment-water interface increased with the accumulation of SPM. Several characteristics of SPM, including high organic matter content, mobile P, high activity of alkaline phosphatase, and high biolog...Continue Reading

References

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Citations

Jul 6, 2016·Environmental Pollution·Yulu GaoHans Christian Bruun Hansen
May 29, 2018·Environmental Science and Pollution Research International·Qianjiahua LiaoJingge Shang
Nov 21, 2020·The Science of the Total Environment·Lei ZhangZhaode Wang

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