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Characteristics of N2O Emission in Distilled Water and Activated Sludge Mixture
- Ding, Xiaoqian, Zhao, Jianqiang, Hu, Bo, Wang, Sha, Gao, Kun, Zhao, Rixiang
- Water, air, and soil pollution 2019 v.230 no.2 pp. 31
- activated sludge, bacteria, denitrification, greenhouse gas emissions, mass transfer, nitrogen, nitrous oxide
- To investigate the emission characteristics of the dissolved N₂O in distilled water and activated sludge mixture, the total volume mass transfer coefficients of N₂O in distilled water and activated sludge mixture were determined by batch experiments. The results indicated a difference between emission processes of N₂O in distilled water and activated sludge mixture. At different initial N₂O concentrations, the total volume mass transfer coefficients of N₂O in distilled water were relatively stable, while the total volume mass transfer coefficients of N₂O in activated sludge mixture increased with increasing initial N₂O concentrations, due to endogenous denitrification by microorganisms in the mixture. Since N₂O was reduced and consumed by heterotrophic bacteria in activated sludge, biochemical reactions were involved in the transfer process of N₂O escaping from the mixture to the atmosphere. Therefore, use of distilled water was suggested to determine the total volume mass transfer coefficient in experiments calculating N₂O emission rates for biological nitrogen removal processes.