CONSTRUCTION OF MICRO-ECOSYSTEM IN RURAL RIVERS AND IN-SITU REMEDIATION ON THE SEDIMENT

WANG Yiming; DING Lu; XU Jiaying; SHI Lei; LIU Yifan; LIANG Wenbo; YANG Xiaoli

doi:10.13205/j.hjgc.202211008

Volume 40 Issue 11

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(11): 54-60

LIU Yu-tong, ZHANG Yun, HOU Hao-chen, GAO Qiu-feng, XU Xiao-zhu. LIFE CYCLE ASSESSMENT OF HIGH PURITY MAGNESIUM PRODUCTION[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(6): 187-191. doi: 10.13205/j.hjgc.202106028

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WANG Yiming, DING Lu, XU Jiaying, SHI Lei, LIU Yifan, LIANG Wenbo, YANG Xiaoli. CONSTRUCTION OF MICRO-ECOSYSTEM IN RURAL RIVERS AND IN-SITU REMEDIATION ON THE SEDIMENT[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 54-60. doi: 10.13205/j.hjgc.202211008

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CONSTRUCTION OF MICRO-ECOSYSTEM IN RURAL RIVERS AND IN-SITU REMEDIATION ON THE SEDIMENT

doi: 10.13205/j.hjgc.202211008

School of Civil Engineering, Southeast University, Nanjing 211189, China

Received Date: 2022-01-22
Available Online: 2023-03-24

Abstract

Abstract

The accumulation of nitrogen and phosphorus elements in rural river sediments in China is serious, and the existing physical and chemical remediation technology has some problems, such as incomplete removal of pollutants and easy destruction of the aquatic ecosystem. The adoption of biological ecological remediation technology can not only inhibit the release of sediment pollution, but also restore the aquatic ecosystem and strengthen the self-purification function of water bodies. In this paper, a sediment-water interface micro-ecosystem with corn straw biochar immobilizing denitrification bacteria, Vallisneria natans and Elodea nuttallii-snail was constructed, and the removal effect of pollutants in sediment and overlying water, and the effect on the microbial community structure of sediment were investigated. The results showed that the composite micro-ecosystem could effectively remove nitrogen and phosphorus pollution from the sediment. After 62 days of operation, the removal efficiencies of TN and TP from the sediment were 77.40% and 54.98%, respectively. The sediment with severe pollution level of TN, TP, and organic matters could be restored to the level of mild, moderate and clean, respectively. At the same time, the micro-ecosystem had a good removal effect on nitrogen in overlying water, and the concentration of NH₄⁺-N and TN in overlying water reached the class Ⅲ of Environmental Quality Standard for Surface Water. The construction of the micro-ecosystem improved the biodiversity of the river sediment system, and the relative abundance of Chloroflexi, which indicates the pollution of sediment, got decreased, while the relative abundance of Proteobacteria, which is capable of degrading pollutants, got increased.
- microecosystem,
- rural river,
- straw-based biochar,
- in-situ remediation,
- overlying water,
- water quality

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References

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