废水处理中异化硝酸盐还原为铵的研究进展

废水处理过程中涉及多种氮转化途径,其中,异化硝酸盐还原为铵(Dissimilatory Nitrate Reduction to Ammonium,DNRA)能够将NO3-/NO2-转化为NH4+,是氮素转化的重要一环.概述了DNRA过程的两步反应机理以及涉及的微生物,着重讨论了废水处理中影响DNRA过程的潜在因素,包...

Research progress of dissimilatory nitrate reduction to ammonium in wastewater treatment

There are many ways of nitrogen transformation in wastewater treatment, among which dissimilatory nitrate reduction to ammonium (DNRA) convert NO₃^-/NO₂^- into NH₄⁺, which is an important part of nitrogen transformation.This paper reviews the two-step reaction mechanism of DNRA process and microorganisms involved. In addition, the potential factors affecting the DNRA process in wastewater treatment, such as dissolved oxygen, types of carbon or nitrogen sources, C/N ratio, temperature, pH and special substances contained in wastewater,are emphatically discussed to explore how to regulate the competition between DNRA and denitrification fornitrate, and this paper introduces two main analytical methods for DNRA process in wastewater treatment.This paper confirms the occurrence and contribution of DNRA process in wastewater treatment, and the in-depth study of DNRA is of great significance for the removal or recovery of nitrogen in wastewater.