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Evaluating Microbial Interactions of Autotrophs and Heterotrophs in Partial Nitritation/Anammox (PN/A) Process by Experimental and Simulation Analyses

Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
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Academic Editor: Jesus Gonzalez-Lopez
Water 2021, 13(3), 324; https://doi.org/10.3390/w13030324
Received: 23 December 2020 / Revised: 17 January 2021 / Accepted: 22 January 2021 / Published: 28 January 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
The microbial interactions between autotrophs and heterotrophs by the exchange of microbial products in a partial nitritation/anammox (PN/A) bioreactor were evaluated with both experimental and simulation analyses. Real-time quantitative PCR analysis showed that anammox bacteria (AMX) and ammonium oxidizing bacteria (AOB) made up 56.59% and 8.35% of total bacteria, respectively, while heterotrophs identified as Chloroflexi also constituted a large portion (32.76%) in the reactor, even without an external organic carbon supply. Furthermore, a mathematical model was developed to describe the growth of heterotrophs on soluble microbial products (SMP), which were released from the metabolism of autotrophs. After model calibration and validation, the simulation results were consistent with the experimental observations of the microbial composition and the nitrogenous transformations. According to the model analysis, the bulk oxygen concentration was determined to be the dominant factor governing the reactor performance and biomass fractions in the granule. Increasing granular size could decrease heterotrophic growth, but has little effect on the effluent concentration of SMP. Results of this study could establish a better understanding of eco-physiological interactions of autotrophs and heterotrophs in PN/A process. View Full-Text
Keywords: anammox; heterotrophic growth; granular sludge; soluble microbial products; modeling anammox; heterotrophic growth; granular sludge; soluble microbial products; modeling
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MDPI and ACS Style

Lai, G.; Chu, Z.; Huang, X.; Ma, J.; Rong, H. Evaluating Microbial Interactions of Autotrophs and Heterotrophs in Partial Nitritation/Anammox (PN/A) Process by Experimental and Simulation Analyses. Water 2021, 13, 324. https://doi.org/10.3390/w13030324

AMA Style

Lai G, Chu Z, Huang X, Ma J, Rong H. Evaluating Microbial Interactions of Autotrophs and Heterotrophs in Partial Nitritation/Anammox (PN/A) Process by Experimental and Simulation Analyses. Water. 2021; 13(3):324. https://doi.org/10.3390/w13030324

Chicago/Turabian Style

Lai, Guowang, Zhaorui Chu, Xiaoyu Huang, Jianye Ma, and Hongwei Rong. 2021. "Evaluating Microbial Interactions of Autotrophs and Heterotrophs in Partial Nitritation/Anammox (PN/A) Process by Experimental and Simulation Analyses" Water 13, no. 3: 324. https://doi.org/10.3390/w13030324

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