Advances in the study of organic matter effects on ANAMMOX performance and its microorganisms

Abstract

The anaerobic ammonia oxidation（ANAMMOX） process is recognized by the industry as an efficient and low-consumption sustainable biological nitrogen removal technology. However，anaerobic ammonia oxidizing bacteria（AnAOB） have long growth period of generations and are sensitive to environmental factors. Organic matter，as the most common material in wastewater，has a more complex effect on the ANAMMOX process for nitrogen removal. It reviewed the effects of organic substance type，organic substance concentration on the nitrogen removal performance of the ANAMMOX process，functional microorganisms and its reasons. The smaller the molecular weight of the organic substance type and the simpler the structure were，the more significant effect on AnAOB was. Under low organic substance concentration conditions，AnAOB had a diverse metabolic pathway that utilized simple organics. Appropriate C/N promoted synergistic symbiosis between denitrifying bacteria and AnAOB，which could promote AnAOB growth to some extent. High concentrations of organics tended to cause denitrifying bacteria to dominate and compete with AnAOB for substrate，and could even alter the normal metabolic pathways of AnAOB. Alcohols had a strong irreversible inhibitory effect on AnAOB，and the inhibitory effect of antibiotics and phenols tended to be reversible. Candidatus Brocadia and Candidatus Jettenia had relatively good adaptability to organic substance. Understanding the effect of organics on AnAOB could provide important reference for process design and engineering applications of ANAMMOX.

Keywords

• anaerobic ammonia oxidizing bacteria
• organic matter
• metabolic pathways
• microbial species