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Water 2014, 6(10), 2978-2992; doi:10.3390/w6102978

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

1
Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China
2
School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China
*
Author to whom correspondence should be addressed.
Received: 8 August 2014 / Revised: 20 September 2014 / Accepted: 22 September 2014 / Published: 1 October 2014
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Abstract

The effective management of high ammonium containing wastewater is important for the sustainable development of the wastewater industry. A pre-denitrification and post-nitrification two-sludge system was proposed to treat high ammonium containing wastewater with low carbon-to-nitrogen (C/N) ratios. In the system, pre-denitrification was adopted to use organic carbon in raw wastewater efficiently for nitrogen removal, while post-nitrification was adopted to achieve nitritation. System performance and the characteristics of nitrous oxide (N2O) emission were examined. As to the influent chemical oxygen demand (COD) and ammonium nitrogen (NH4-N) concentration, both 800 mg/L, nitrogen removal was mainly through pre-denitrification, and the nitrogen removal percentage was 43.4%. In post-nitrification, nitritation was achieved with a nitrite accumulation efficiency of 97.8% and a NH4-N removal loading rate of 0.45 g/(L·d). With nitrite as the electron acceptor during denitrification, its removal rate increased, while the N2O emission factor decreased with increasing C/N ratios. Nitrification was affected significantly by the aeration rate. When the aeration rate was below 0.6 L/min, the NH4-N removal rate increased, while the N2O emission rate decreased with increasing aeration rates. However, when the aeration rate was above 0.6 L/min, it had little influence on N2O emission. During nitrification, N2O emission factors decreased exponentially with increasing ammonium oxidation rates. View Full-Text
Keywords: nitritation; nitrous oxide; high ammonium containing wastewater; carbon-to-nitrogen ratio; two-sludge system nitritation; nitrous oxide; high ammonium containing wastewater; carbon-to-nitrogen ratio; two-sludge system
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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MDPI and ACS Style

Wu, G.; Zheng, D.; Xing, L. Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater. Water 2014, 6, 2978-2992.

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