Advanced nitrogen removal from low C/N municipal wastewater by combining partial nitrification-anammox and endogenous partial denitrification-anammox (PN/A-EPD/A) process in a single-stage reactor. (November 2021)

• Record Type: Journal Article
• Authors: Cui, Huihui; Zhang, Liang; Zhang, Qiong; Li, Xiyao; Huang, Yu; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 339(2021)
• Publication Date: 2021-11
• Subjects: Anaerobic ammonia oxidation (anammox) -- NOB inhibition -- Endogenous partial denitrification (EPD) -- Municipal sewage -- Integrate fixed biofilm activated sludge (IFAS); 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.2021.125501
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: PN/A-EPD/A process was developed in an IFAS-SBR treating real municipal wastewater. High NRE of 90.1% was achieved under aerobic HRT of 8 h and DO of 0.4 ± 0.1 mg/L. 89.9% of TN was removed by anammox pathway in typical cycle. Relative abundance of Candidatus Brocadia rose from 0% to 0.79% in suspended sludge. Abstract: In this study, an innovative partial nitrification-anammox (PN/A) and endogenous partial denitrification-anammox (EPD/A) process was developed in a single-stage integrated fixed film activated sludge sequencing batch reactor (IFAS-SBR) treating real municipal wastewater with C/N ratio below 3.2. Enhanced efficiency of total nitrogen (TN) removal reached 90.1% with low HRT of 12 h and DO of 0.4 ± 0.1 mg/L. Detailed nitrogen removal mechanism analysis of typical cycle revealed that 89.9% of TN was eliminated through anammox pathway. Anammox bacteria ( Candidatus Brocadia ) and endogenous denitrifying bacteria ( Candidatus Competibacter ) were abundant both in biofilms and suspended sludge, meanwhile ammonium-oxidizing bacteria has outcompeted nitrite-oxidizing bacteria, which all favored the synergistic effect of anammox with PN and EPD and contributed to the improvement of nitrogen removal. Overall, the above results confirmed that combined PN/A and EPD/A process is a reliable and efficient alternative for mainstream anammox process.