Risk of sediment release from grass/algae mixed lakes and its control countermeasures: A case study of the Taihu Lake

LIU Wei; HU Baoan; CHENG Jin; HUANG Jiayin; ZHANG Yong

doi:10.13205/j.hjgc.202502016

Volume 43 Issue 2

Feb. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(2): 157-166

LIU Wei, HU Baoan, CHENG Jin, HUANG Jiayin, ZHANG Yong. Risk of sediment release from grass/algae mixed lakes and its control countermeasures: A case study of the Taihu Lake[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 157-166. doi: 10.13205/j.hjgc.202502016

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LIU Wei, HU Baoan, CHENG Jin, HUANG Jiayin, ZHANG Yong. Risk of sediment release from grass/algae mixed lakes and its control countermeasures: A case study of the Taihu Lake[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 157-166. doi: 10.13205/j.hjgc.202502016

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Risk of sediment release from grass/algae mixed lakes and its control countermeasures: A case study of the Taihu Lake

doi: 10.13205/j.hjgc.202502016

China Communications (Tianjin) Ecological and Environmental Protection Design and Research Institute Co., Ltd., Tianjin 300042, China

Received Date: 2024-01-19
Accepted Date: 2024-04-26
Rev Recd Date: 2024-03-26

Abstract

Abstract

In this paper, sediment pollution assessment and nitrogen and phosphorus release risk study in different areas of the Taihu Lake were conducted to assess the impact of nitrogen and phosphorus nutrient exchange flux in the Taihu Lake sediments on the overlying water quality. The results showed that the contents of TN (total nitrogen) and TP (total phosphorus) in the sediment of the Taihu Lake were high, especially the TN content was between 1.85 g/kg and 3.57 g/kg. According to the comprehensive pollution index evaluation, it was at the level of heavy pollution. TP content was between 0.15 g/kg and 1.40 g/kg. According to the comprehensive pollution index assessment, the sediment of the grass type lake areas (Eastern and Southern Taihu Lake) was at a clean level. The concentrations of NH₄⁺-N and dissolved phosphorus (TDP) in pore water of surface sediments were much higher than those in the overlying water in different lake areas. The release rates of NH₄⁺-N and TDP in Meiliang Bay of the algal lake area were 125.86 mg/(m²·d) and 4.88 mg/(m²·d), respectively. The NH₄⁺-N release rate of Eastern Taihu Lake in the grass-type lake area was 42.46 mg/(m²·d), and the TDP release rate was 3.93 mg/(m²·d). The release rates of NH₄⁺-N and TDP at the surface sediment water interface in the algae-type lake area were higher than those in the grass-type lake area. It could be seen that each lake area of the Taihu Lake had a great risk of endogenous release of nitrogen and phosphorus, of which the risk of endogenous release in the algae-type lake area was higher than that in the grass-type lake area. The endogenous release of nitrogen and phosphorus from moderately and severely polluted sediments in the Taihu Lake area was the main reason for eutrophication. We could comprehensively reduce the nutrient load in the lake and enhance the purification effect of the Taihu Lake on water pollutants through external pollution control measures, combined with in-situ coverage technology, ecosystem restoration, aeration and reaeration, environmental dredging of sediment, passivation of sediment and other internal governance methods.
- grass-type lake area,
- algae-type lake area,
- sediments,
- pollution assessment,
- release risk,
- lake eutrophication

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References(38)

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