The role of hydroxylamine in promoting conversion from complete nitrification to partial nitrification: NO toxicity inhibition and its characteristics. (January 2021)

• Record Type: Journal Article
• Authors: Zhao, Junkai; Zhao, Jianqiang; Xie, Shuting; Lei, Shuhan
• Is Part Of: Bioresource technology. Volume 319(2021)
• Publication Date: 2021-01
• Subjects: Hydroxylamine (NH2OH) -- Partial nitrification -- NO -- N2O -- Nitrite-oxidizing bacteria (NOB); Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.124230
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: NH2 OH has a strong inhibition on NOB. Inhibition of NOB by 5 mg-N/L NH2 OH is reversible. NH2 OH addition caused production of NO and N2 O to increase. Inhibition of Nitrospira by NH2 OH could be related to NO production. Abstract: This study investigated a strategy for hydroxylamine (NH2 OH) addition for promoting the conversion of complete nitrification to partial nitrification in a sequencing batch reactor (SBR). The results showed that continuous dosing of 5 mg-N/L NH2 OH into a complete nitrification reactor for 16 days led to an increase in the nitrite accumulation ratio (NAR) from 0.22% to 95.08% and a significant enhancement in the accumulation of NO and N2 O in the liquid. The maximum concentration of NO in each cycle rose with the increase of NAR during NH2 OH addition. With the stopping of NH2 OH addition, the partial nitrification disappeared progressively in 21 days. The analysis for microbial community showed that Nitrospira was the main NOB and its relative abundance decreased with NH2 OH addition and recovered after the cessation of NH2 OH addition. Accordingly, NH2 OH has a significant and reversible inhibition on Nitrospira and its essence might be related to NO toxicity.