Denitrification performance and microbial versatility in response to different selection pressures

Bioresource Technology
Roya PishgarJoo Hwa Tay

Abstract

This study investigated functional dynamics of microbial community in response to different selection pressures, with a focus on denitrification. Suspended-biomass experiments demonstrated limited aerobic and relatively higher anoxic nitrate and nitrite reduction capabilities; the highest NO2-N and NO3-N removal rates were 1.3 ± 0.1 and 0.74 ± 0.01 in aerobic and 1.4 ± 0.05 and 3.4 ± 0.1 mg/L.h in anoxic media, respectively. Key potential denitrifiers were identified as: (i) complete aerobic denitrifiers: Dokdonella, Flavobacterium, and Ca. Accumulibacter; (ii) complete anoxic denitrifiers: Acinetobacter, Pseudomonas, Arcobacter, and Comamonas; (iii) incomplete nitrite denitrifier: Diaphorobacter (aerobic/anoxic), (iv): incomplete nitrate denitrifiers: Thauera (aerobic/anoxic) and Zoogloea (strictly-aerobic). Granular biomass removed 72 mg/L NH4-N with no NOx- accumulation. Heterotrophic nitrification and aerobic denitrification were proposed as the principal nitrogen removal pathway in granular reactors, potentially performed by two key organisms Thuaera and Flavobacterium. Biodiversity analysis suggested that the selection pressure of nourishment condition was the decisive factor for microbial selection and nitrogen removal m...Continue Reading

Citations

Apr 16, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xiaoling ZhangMeng Zhang
May 1, 2020·Frontiers in Microbiology·Edgardo I ValenzuelaFrancisco J Cervantes
Jul 2, 2020·Scientific Reports·Andrew L NealJohn W Crawford
Jan 13, 2021·Environmental Science & Technology·Li-Kun WangBing-Jie Ni

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