Next Article in Journal
Aquatic Ecosystem Health Assessment of Poyang Lake through Extension Evaluation Method
Previous Article in Journal
Effects of Biochar Addition on Rice Growth and Yield under Water-Saving Irrigation
Open AccessArticle

Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism

1
College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
2
College of Environmental Science and Technology, North China Electric Power University, Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 210; https://doi.org/10.3390/w13020210
Received: 11 December 2020 / Revised: 9 January 2021 / Accepted: 14 January 2021 / Published: 17 January 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01–0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants. View Full-Text
Keywords: comammox; heterotrophic denitrification; intermittent aeration; municipal wastewater treatment; nitrifier denitrification; nitrous oxide comammox; heterotrophic denitrification; intermittent aeration; municipal wastewater treatment; nitrifier denitrification; nitrous oxide
Show Figures

Graphical abstract

MDPI and ACS Style

Liu, T.; Liu, S.; He, S.; Tian, Z.; Zheng, M. Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism. Water 2021, 13, 210. https://doi.org/10.3390/w13020210

AMA Style

Liu T, Liu S, He S, Tian Z, Zheng M. Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism. Water. 2021; 13(2):210. https://doi.org/10.3390/w13020210

Chicago/Turabian Style

Liu, Tang; Liu, Shufeng; He, Shishi; Tian, Zhichao; Zheng, Maosheng. 2021. "Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism" Water 13, no. 2: 210. https://doi.org/10.3390/w13020210

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop