Author:
Chuang Hui-Ping,Ohashi Akiyoshi,Harada Hideki
Abstract
The accumulation of ammonium (NH4+-N) and nitrous oxide (N2O-N) in the environment is causing concern due to their ecological impacts and contribution to global warming. Autotrophic nitrogen oxidizers, including aerobic ammonium-oxidizing archaea and bacteria, anaerobic ammonium oxidizer and nitrite oxidizers, play a crucial role in the nitrogen cycle by facilitating the removal of nitrogenous residues from the environment. Nitrogen oxides (NOx) like nitrite (NO2−-N) and nitrate (NO3−-N) are produced as key immediate products during the conversion of NH4+-N or N2O-N. Additionally, these autotrophic microbes utilize carbon dioxide (CO2) for cell synthesis, thereby mitigating the greenhouse effect. Preliminary results pointed out that nitrogen oxidizers could effectively remove NH4+-N and NOx from sewage and wastewater systems at the loading rate lower than 0.5 kg N/m3-day. Moreover, this family could also reduce the greenhouse N2O-N through oxidizing pathway, attaining the maximum reduction of 25.2-fold the annual N2O production.
Reference105 articles.
1. NOAA: Global Monitoring Laboratory. Carbon cycle greenhouse gases [Internet]. 2022. Available from: https://gml.noaa.gov/ccgg/trends/
2. Ravishankara AR, Daniel JS, Portmann RW. Nitrous oxide (N2O): The dominant ozone-depleting substance emitted in the 21st century. Science. 2009;326:123-125
3. Kuypers MMM, Marchant HK, Kartal B. The microbial nitrogen-cycling network. Nature Reviews Microbiology. 2018;16:263-276
4. Gupta VK, Sadegh H, Yari M, Ghoshekandi RS, Maazinejad B, et al. Removal of ammonium ions from wastewater-a short review in development of efficient methods. Global Journal of Environmental Science and Management. 2015;1(2):148-158
5. Ming T, de Richter R, Chen S, Caillol S. Fighting global warming by greenhouse gas removal destroying atmospheric nitrous oxide thanks to synergies between two breakthrough technologies. Environmental Science and Pollution Research. 2016;23:6119-6138