摘要
现有理论认为氨化–硝化–反硝化是活性污泥生物脱氮的主要途径,忽略了硝态氮异化还原成铵(DNRA)作用。本文从DNRA作用对脱氮的影响、DNRA的主要影响因素、菌属及种群鉴定等方面进行综述,阐述了C/N、碳源种类和浓度、硫化物、Fe2+、阴极电压等对DNRA的影响根本原因是电子供体和电子受体的比例问题,影响DNRA与反硝化及Anammox过程竞争的主要因素是电子供体/电子受体、氮源种类、污泥龄、温度和pH,提出了今后应在活性污泥生物脱氮系统对DNRA与反硝化的竞争机理、二者在各工艺系统中的种群丰度、基质和环境因素交互作用、微生物种群间信号传递以及其他氮素转化过程耦联等方面亟需深入研究。
Ammoniation-nitrification-denitrification is always the main way to remove nitrogen from waste-water for activated sludge. However, the theory neglects the impact of dissimilatory nitrate reduc-tion to ammonia (DNRA) during nitrogen removal process. The review presents the impacts of DNRA on nitrogen removal, main mechanisms of major substrate and environmental factors on DNRA, and species identification. The main impact of C/N, types and concentration of carbon source, sulfide, Fe2+, cathode potentials et al. on DNRA is that could change the value of electron donor/electron acceptor. Then supply of electron donor/electron acceptor, nitrogen source, pH and temperature were identified as key environmental controls that whether nitrate will be reduced through DNRA, denitrification or Anammox. Further studies focus on the competitive mechanism of DNRA and denitrification, community structure, interaction of substrate and environmental factors, signal transfer between microbial population as well as other nitrogen transformation process decoupling in activated sludge system and other biosocial nitrogen removal.
出处
《环境保护前沿》
2018年第2期95-105,共11页
Advances in Environmental Protection
基金
西安科技大学培育基金(2014039)
西安科技大学博士启动金(2015QDJ009)
国家自然科学基金(51509200)。
