CHARACTERICS OF DENITRIFICATION AND N<sub>2</sub>O EMISSION OF ACCLIMATED GLYCOGEN ACCUMULATING ORGANISMS USING DIFERENT ELECTRON ACCEPTOR

JU Hong-hai

doi:10.13205/j.hjgc.202009019

Volume 38 Issue 9

Nov. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(9): 113-118

JU Hong-hai. CHARACTERICS OF DENITRIFICATION AND N2O EMISSION OF ACCLIMATED GLYCOGEN ACCUMULATING ORGANISMS USING DIFERENT ELECTRON ACCEPTOR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(9): 113-118. doi: 10.13205/j.hjgc.202009019

Citation:

JU Hong-hai. CHARACTERICS OF DENITRIFICATION AND N₂O EMISSION OF ACCLIMATED GLYCOGEN ACCUMULATING ORGANISMS USING DIFERENT ELECTRON ACCEPTOR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(9): 113-118. doi: 10.13205/j.hjgc.202009019

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CHARACTERICS OF DENITRIFICATION AND N₂O EMISSION OF ACCLIMATED GLYCOGEN ACCUMULATING ORGANISMS USING DIFERENT ELECTRON ACCEPTOR

doi: 10.13205/j.hjgc.202009019

JU Hong-hai

Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China

Received Date: 2020-04-25

Abstract

Abstract

Using an anaerobic-aerobic sequencing batch reactor (AO-SBR), the glycogen accumulating organisms (GAOs) had been enriched with sodium acetate as the carbon source and the P/C ratio lower than 2/100. Cultured in anaerobic-anoxic operation mode, the acclimated GAOs could perform endogenous denitrification reaction with NO_x^--N as electron acceptor and poly-β-hydroxyalkanoate(PHA) as electron donor, where PHB (poly-β-hydro-xybutyrate) accounted for more than 80% of the PHA decomposition and utilization. The higher NO₂^- concentration inhibited the activity of DGAOs, which led to the decrease of PHA synthesis. More energy from PHA decomposition would be used for glycogen storage. During the reduction process of NO₃^- and NO₂^-, the PHA degradation rate was 19.28 mg/(g·h) and 10.02 mg/(g·h) respectively, which resulted in the related endogenous denitrification rates were 3.32 mg/(g·h) and 2.29 mg/(g·h). The TN removal efficiency reached more than 95% in the end. With the increase of NO₂^-/NO_x^-, the N₂O yield during the endogenous denitrification process increased from 29.1% to 59.0%. The higher NO₂^- inhibition on the activity of Nos, as well as the electron competition between Nir and Nos, resulted in the higher N₂O production during PHA-driven denitrification by DGAOs.
- glycogen accumulating organisms (GAOs),
- electron acceptor,
- endogenous denitrification,
- N₂O,
- electron distribution

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References(20)

References

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