Step feed mode synergistic mixed carbon source to improve sequencing batch reactor simultaneous nitrification and denitrification efficiency of domestic wastewater treatment. (August 2022)

• Record Type: Journal Article
• Authors: Yan, Lilong; Zheng, Yaoqi; Chen, Wanting; Liu, Shuang; Yin, Mingyue; Jiang, Jishuang; Yang, Mengya
• Is Part Of: Bioresource technology. Volume 358(2022)
• Publication Date: 2022-08
• Subjects: Simultaneous nitrification and denitrification -- Step-feeding mode -- Mixed carbon source -- Functional genes -- Microbial population succession; 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.2022.127440
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Using this strategy, the TIN removal rate was 92.60% by SND ways. Increasing the starch content can contribute to the accumulation of PS and PN. NaAC and starch of 5:1 provided long-term electron for denitrification process. NaAC and starch of 5:1 improved the abundance of aerobic denitrifying bacteria. Abstract: The limited efficiency of nitrogen removal has traditionally hindered wide application of simultaneous nitrification and denitrification (SND) technology. Here, the nitrogen removal characteristics of a sequencing batch reactor were studied by adopting a strategy of a step-feeding mode, synergistic regional oxygen limitation, and a mixed carbon source. The changes of the microbial population succession and nitrogen metabolism functional genes were analyzed. This strategy provided a favorable level of dissolved oxygen and continuous carbon sources for driving the denitrification process. The total nitrogen removal efficiency and SND rate reached 92.60% and 96.49%, respectively, by regulating the ratio of sodium acetate to starch in the step feed to 5:1. This procedure increased the relative abundance of denitrifying functional genes and induced the growth of a variety of traditional denitrifying bacteria and aerobic denitrifying bacteria participating in the process of nitrogen removal. Overall, this work offers a new strategy for achieving efficient SND.