GONG You-kui,LI Jian-hui,LI Mei-ling,et al.Characteristics of Denitrification and N2O Emission of Acclimated Glycogen Accumulating Organisms under Different Carbon Sources[J].China Water & Wastewater,2021,37(5 5):17-25.
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Characteristics of Denitrification and N2O Emission of Acclimated Glycogen Accumulating Organisms under Different Carbon Sources

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 5 5 Page: 17-25 Column: Date of publication: 2021-03-01
Author(s):
GONG You-kui1; 2; LI Jian-hui1; LI Mei-ling1; PENG Yong-zhen2
(1. Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China; 2. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China)
Keywords:
denitrifying glycogen accumulating organisms; endogenous denitrification; N2O emission; polyhydroxyalkanoate; glycogen
Abstract:
In order to investigate the denitrification efficiency and N2O emission characteristic of denitrifying glycogen accumulating organisms (DGAOs), variation of the endogenous polymer and N2O emission characteristic during endogenous denitrification process were explored in two separated sequencing batch reactors (SBRAc and SBRGl) using sodium acetate and glucose as carbon sources respectively. The total nitrogen removal efficiencies of SBRAc and SBRGl were (80.2±2.8)% and (63.4±3.5)%, and the N2O yields were (7.16±1.43)% and (13.35±2.46)%, respectively. When sodium acetate was used as carbon source, organics absorbed by DGAOs in anaerobic stage was stored in the form of endogenous polyhydroxyalkanoate (PHA). When glucose was used as carbon source, part of the organics was used for intracellular glycogen (Gly) accumulation, and PHA synthesis decreased. In the endogenous denitrification process of DGAOs, PHA and Gly were successively used as endogenous carbon sources, and the rate of electron supply by PHA was much higher than that of Gly, leading to accumulation of a large amount of NO2- and increase of N2O emission in SBRGl. The inhibitory effect of NO2- on activity of nitrous oxide reductase was the main factor leading to N2O emission during the endogenous denitrification of DGAOs. Compared with glucose, sodium acetate was more easily absorbed by DGAOs as an easily used endogenous carbon source PHA, and the emission of N2O during denitrification was reduced.
Last Update: 2021-03-01