Comparison of inhibitory roles on nitrite-oxidizing bacteria by hydroxylamine and hydrazine during the establishment of partial nitrification. (July 2022)

• Record Type: Journal Article
• Authors: Zhao, Junkai; Lei, Shuhan; Cheng, Guangwei; Zhang, Ju; Shi, Bingfeng; Xie, Shuting; Zhao, Jianqiang
• Is Part Of: Bioresource technology. Volume 355(2022)
• Publication Date: 2022-07
• Subjects: Partial nitrification -- Hydroxylamine -- Hydrazine -- Nitric oxide -- Nitrite-oxidizing bacteria; 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.2022.127271
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: NH2 OH has a stronger inhibitory role on NOB than N2 H4 . Inhibition of NOB by NH2 OH or N2 H4 combined with aeration time control is reversible. The addition of NH2 OH or N2 H4 leads to NO production during nitrification. Inhibition of Nitrospira could be related to the toxicity of NO. Abstract: The inhibitory roles of hydroxylamine (NH2 OH) and hydrazine (N2 H4 ) on nitrite-oxidizing bacteria were investigated in a comparative study. The results showed that nitrite accumulation was achieved by adding 5 mg-N/L NH2 OH or N2 H4 to two parallel sequencing batch reactors, with nitrite accumulation rate reaching 95.83% and 86.58% within 15 days after adopting aeration time control, respectively. Correspondingly, the maximum level of NO in typical cycles caused by NH2 OH addition was 0.18 mg-N/L, which was higher than obtained for N2 H4 . NH2 OH or N2 H4 showed strong inhibition on Nitrospira and promoted the enrichment of Nitrosomonas, with the effects of NH2 OH being more significant. However, nitritation began to deteriorate after the cessation of inhibitors addition. In conclusion, NH2 OH was a better inhibitor than N2 H4 for Nitrospira . The inhibitory role of NH2 OH was primarily related to NO toxicity, while for N2 H4 it was attributed to its own toxicity, with NO playing a smaller role.