EFFECTS OF INTERMITTENT MICROPOROUS AERATION ON MICROBIAL COMMUNITIES IN URBAN RIVER SEDIMENTS UNDER DIFFERENT HYDRODYNAMIC CONDITIONS

PAN Shenyang; ZHANG Wenlong; LI Yi; YANG Xuemei

doi:10.13205/j.hjgc.202208004

Volume 40 Issue 8

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(8): 31-39

LI Haiyan, QIANG Yu, HU Yanjiao, LIU Jing, QIN Fanxin. EFFECT OF MODIFIED NANO-TIO2 ON ARSENIC SPECIES AND ENZYME ACTIVITY IN ARSENIC CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 136-142. doi: 10.13205/j.hjgc.202208019

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PAN Shenyang, ZHANG Wenlong, LI Yi, YANG Xuemei. EFFECTS OF INTERMITTENT MICROPOROUS AERATION ON MICROBIAL COMMUNITIES IN URBAN RIVER SEDIMENTS UNDER DIFFERENT HYDRODYNAMIC CONDITIONS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 31-39. doi: 10.13205/j.hjgc.202208004

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EFFECTS OF INTERMITTENT MICROPOROUS AERATION ON MICROBIAL COMMUNITIES IN URBAN RIVER SEDIMENTS UNDER DIFFERENT HYDRODYNAMIC CONDITIONS

doi: 10.13205/j.hjgc.202208004

Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China

Received Date: 2021-10-04
Publish Date: 2022-11-08

Abstract

Abstract

Microporous aeration technology is widely used in urban river management. The changes in the structure and function of the microbial community during the intermittent aeration process and after aeration stopped are still unclear. Indoor simulation experiments were used in this paper to investigate the changing process of pollutant concentration in water bodies under different hydrodynamic conditions, as well as the response law of the structure and function of the sedimentary microbial community from the beginning of aeration to 5 days after aeration, and then 10 days. The results showed that: the DO could be maintained at a high level under different hydrodynamic conditions, both during the intermittent aeration process and after the aeration stopped, but the water pollutant concentration rose significantly after aeration stopped, and the pollutant concentration rose the most slowly under the low flow rate condition (v=0.24 m/s). In terms of microbial community composition, this phenomenon resulted from the genus Hydrogenophaga and Novosphingobium, which were related to organic matter metabolism, became the dominant genus only under the condition of low flow rate after aeration stopped and stood still for 10 days, making the organic matter in the water body more prone to degradation, and the pollutant concentration rise more slowly. In terms of microbial community function, after aeration stopped for 10 days, metabolic pathways such as energy metabolism, coenzyme and vitamin metabolism, which were usually more common in eutrophic water bodies, were more present in water bodies under static and high flow rate (v=0.93 m/s). That explained the higher pollutant concentration under these two flow rates. The research results can provide a theoretical basis for persistently improving river water quality through intermittent microporous aeration.
- hydrodynamic conditions,
- intermittent microporous aeration,
- water quality improvement,
- microbial community and function

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References(29)

References

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