Impacts of organics on the microbial ecology of wastewater anammox processes: Recent advances and meta-analysis

• Published in: Water research (Oxford) Vol. 191; p. 116817
• Main Authors: Xiao, Rui, Ni, Bing-Jie, Liu, Sitong, Lu, Huijie
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-03-2021
• Subjects: Ammonium Compounds; Anaerobiosis; Anammox; Bioreactors; Co-occurrence network; Core taxa; Denitrification; Endogenous organics; Exogenous organics; Nitrogen; Oxidation-Reduction; Waste Water; Hzs; NRE; PD/A; Denitratation; Anammox; EPS; Endogenous organics; AOA; AOB; NLR; PN/A; DNRA; NOB; Comammox; VFAs; MOCO; HSW; Co-occurrence network; LSW; SAA; Core taxa; WWTP; SMP; Hao; Exogenous organics; N-damo
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2021.116817

•Autotrophs and heterotrophs in anammox systems are versatile in using organics.•Endogenous organics facilitate biofilm formation and cross-feeding interactions.•19 core and 7 keystone taxa are identified based on 149 wastewater anammox samples.•Appropriate organics management is key to enhancing nitrogen removal by anammox.
Anaerobic ammonium oxidation (anammox) represents a promising technology for wastewater nitrogen removal. Organics management is critical to achieving efficient and stable performance of anammox or integrated processes, e.g., denitratation-anammox. The aim of this systematic review is to synthesize the state-of-the-art knowledge on the multifaceted impacts of organics on wastewater anammox community structure and function. Both exogenous and endogenous organics are discussed with respect to their effects on the biofilm/granule structure and function, as well as the interactions between anammox bacteria (AnAOB) and a broad range of coexisting functional groups. A global core community consisting of 19 taxa is identified and a co-occurrence network is constructed by meta-analysis on the 16S rDNA sequences of 149 wastewater anammox samples. Correlations between core taxa, keystone taxa, and environmental factors, including COD, nitrogen loading rate (NLR) and C/N ratio are obtained. This review provides a holistic understanding of the microbial responses to different origins and types of organics in wastewater anammox reactors, which will facilitate the design and operation of more efficient anammox-based wastewater nitrogen removal process.
[Display omitted]