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Water 2017, 9(7), 477; https://doi.org/10.3390/w9070477

Effects of the Food-to-Microorganism (F/M) Ratio on N2O Emissions in Aerobic Granular Sludge Sequencing Batch Airlift Reactors

1
Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, China
2
Environmental Research Institute, Shandong University, 27 Shanda Nanlu, Jinan 250100, China
3
School of Municipal and Environmental Engineering, Shandong Jianzhu University, Fengming Licheng District Lingang Development Zone, Jinan 250101, China
*
Author to whom correspondence should be addressed.
Received: 30 April 2017 / Revised: 11 June 2017 / Accepted: 22 June 2017 / Published: 29 June 2017
(This article belongs to the Special Issue Modeling of Water Systems)
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Abstract

The present study investigated the effect of the food-to-microorganism (F/M) ratio on nitrous oxide (N2O) emissions in aerobic granular sludge sequencing batch airlift reactors. Three identical sequencing batch airlift reactors were fed with sodium acetate-based wastewater at different chemical oxygen demand (COD) concentrations, resulting in F/M ratios from 0.2 to 0.67 g COD/g SS. The results indicated that N2O emissions increased with an increase of the F/M ratio. N2O emissions at the high F/M ratio of 0.67 g COD/g SS were the highest (4.4 ± 0.94 mg/d). The main source of the high N2O emissions at the F/M ratio of 0.67 g COD/g SS was nitrifier denitrification, rather than heterotrophic denitrification, confirmed by the qPCR (quantitative real-time PCR) results. The heterotrophic denitrification was destroyed by the DO (dissolved oxygen) diffusing into the sludge particles with porous structures. This study offers theoretical support to study the N2O emissions in aerobic granular sludge, and can provide guidance for conducting risk assessment and enhancing our ability to predict N2O production in aerobic granular sludge at different F/M ratios. View Full-Text
Keywords: aerobic granular sludge; nitrous oxide emission; F/M ratio; nirK gene aerobic granular sludge; nitrous oxide emission; F/M ratio; nirK gene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Guo, N.; Zhang, J.; Xie, H.-J.; Tan, L.-R.; Luo, J.-N.; Tao, Z.-Y.; Wang, S.-G. Effects of the Food-to-Microorganism (F/M) Ratio on N2O Emissions in Aerobic Granular Sludge Sequencing Batch Airlift Reactors. Water 2017, 9, 477.

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