EFFECTS OF TUBIFICID WORMS EXCRETION-FECAL PELLETS ON SEDIMENT MICROENVIRONMENT AND ADSORPTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS

SUN Peirong; LI Dapeng; XU Chutian; CHEN Shutong; TANG Yaoyu

doi:10.13205/j.hjgc.202308002

Volume 41 Issue 8

Aug. 2023

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SUN Peirong, LI Dapeng, XU Chutian, CHEN Shutong, TANG Yaoyu. EFFECTS OF TUBIFICID WORMS EXCRETION-FECAL PELLETS ON SEDIMENT MICROENVIRONMENT AND ADSORPTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 8-17. doi: 10.13205/j.hjgc.202308002

Citation:

SUN Peirong, LI Dapeng, XU Chutian, CHEN Shutong, TANG Yaoyu. EFFECTS OF TUBIFICID WORMS EXCRETION-FECAL PELLETS ON SEDIMENT MICROENVIRONMENT AND ADSORPTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 8-17. doi: 10.13205/j.hjgc.202308002

Citation:

SUN Peirong, LI Dapeng, XU Chutian, CHEN Shutong, TANG Yaoyu. EFFECTS OF TUBIFICID WORMS EXCRETION-FECAL PELLETS ON SEDIMENT MICROENVIRONMENT AND ADSORPTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 8-17. doi: 10.13205/j.hjgc.202308002

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EFFECTS OF TUBIFICID WORMS EXCRETION-FECAL PELLETS ON SEDIMENT MICROENVIRONMENT AND ADSORPTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS

doi: 10.13205/j.hjgc.202308002

School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

Received Date: 2022-06-17
Available Online: 2023-11-15

Abstract

Abstract

To investigate the effect of fecal pellets on the sediment microenvironment, nitrogen and phosphorus adsorption characteristics of surface sediment, and microbial community distribution, a laboratory simulation experiment was constructed by using the sediment and the overlying water from Taihu Lake. The results indicated that fecal pellets significantly changed the water content, porosity, loss on ignition and microbial activity of surface sediment. The decrease of dissolved oxygen concentration and redox potential in surface sediment and the increase of redox potential in deep sediment was related to the vertical migration of particles caused by tubificid worms. In the isothermal adsorption experiment, the newborn fecal pellets showed a good fixation capacity for nitrogen and phosphorus (EC₀=0.73 mg/L, EPC₀=0.014 mg/L). The microbial community structure of fecal pellets in the tubificid worm group was similar to that in the control group, but the microbial diversity decreased in the former group. The increase in the relative abundance of Actinobacteria, Chloroflexi and Cyanobacteria in fecal pellets suggested that fecal pellets accumulation could promote the decomposition of organic matter and the release of nitrogen and phosphorus in sediments. The relative abundance of Cyanobium_PCC-6307 in fecal pellets was three times higher than in the control, implying a correlation between fecal pellets accumulation and water bloom.
- tubificid worm,
- bioturbation,
- adsorption of nitrogen and phosphorus,
- microenvironment,
- fecal pellets

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References(30)

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