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http://hdl.handle.net/10397/88191
Title: | Energy-efficient single-stage nitrite shunt denitrification with saline sewage through concise dissolved oxygen (DO) supply : process performance and microbial communities | Authors: | Zhuang, HC Wu, ZY Xu, LJ Leu, SY Lee, PH |
Issue Date: | Jun-2020 | Source: | Microorganisms, June 2020, v. 8, no. 6, 919, p. 1-13 | Abstract: | Single-stage nitrite shunt denitrification (through nitrite rather than nitrate) with low dissolved oxygen (DO) supply is a better alternative in terms of energy-efficiency, short-footprint, and low C/N-ratio requirement. This study investigates the optimal DO level with temperature effect, with saline sewage at the fixed hydraulic and solids retention times of 8 h and 8 d, respectively. Moreover, 16S rRNA gene sequencing analysis corresponding with total nitrogen (TN) and chemical oxygen demand (COD) removals in each operating condition were performed. Results showed that DO of 0.3 mg/L at 20 degrees C achieved over 60.7% and over 97.9% of TN and COD removal, respectively, suggesting that such condition achieved effective nitrite-oxidizing bacteria inhibition and efficient denitrification. An unexpected finding was that sulfur-reducingHaematobacterand nitrogen-fixingGeofilumandShinellawere highly abundant with the copredominance of ammonia-oxidizingComamonasandNitrosomonas, nitrite-oxidizingLimnohabitans, and denitrifyingSimplicispira,Castellaniella,andNitratireductor. Further, canonical correspondence analysis (CCA) with respect to the operating conditions associated with phenotype prediction via R-based tool Tax4Fun was performed for a preliminary diagnosis of microbial functionality. The effects of DO, temperature, nitrite, and nitrate in various extents toward each predominant microbe were discussed. Collectively, DO is likely pivotal in single-stage nitrite shunt denitrification, as well as microbial communities, for energy-efficient saline sewage treatment. | Keywords: | Nitrite shunt denitrification 16S rRNA sequencing Dissolve oxygen Total nitrogen removal |
Publisher: | MDPI AG | Journal: | Microorganisms | EISSN: | 2076-2607 | DOI: | 10.3390/microorganisms8060919 | Rights: | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Zhuang, H.; Wu, Z.; Xu, L.; Leu, S.-Y.; Lee, P.-H. Energy-Efficient Single-Stage Nitrite Shunt Denitrification with Saline Sewage through Concise Dissolved Oxygen (DO) Supply: Process Performance and Microbial Communities. Microorganisms 2020, 8, 919 is available at https://dx.doi.org/10.3390/microorganisms8060919 |
Appears in Collections: | Journal/Magazine Article |
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Zhuang_Energy-Efficient_Single-Stage_Nitrite.pdf | 2.61 MB | Adobe PDF | View/Open |
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