Regulation of key NO production mechanisms during biological water treatment.

Carlos Domingo-Félez, Barth F Smets

Journal: Current opinion in biotechnology 2020;57():119-126

PMID: 30978621

Full Text on Elsevier Science View on PubMed

Abstract

Nitrous oxide (NO) is a potent greenhouse gas emitted during biological treatment of residual waters and can contribute significantly to the carbon footprint of the overall treatment, potentially offsetting energy-positive strategies. NO production is mediated by three known biological pathways and through abiotic reactions, driven by biologically generated substances such as hydroxylamine and nitrite. The contributions of these different mechanism are determined by the environmental conditions and the resident microbial community. The newly discovered phenotypic diversity among aerobic ammonia oxidizers and the modularity of denitrifying pathway determines NO emissions. Isotopic methods can be used to quantify NO production pathways in water treatment systems, and mechanistic models can already predict NO emissions, but limitations on their accuracy and precision still exist.

Address: Department of Environmental Engineering, Technical University of Denmark, Miljøvej 115, 2800 Kgs. Lyngby, Denmark. Electronic address: [email protected].; Department of Environmental Engineering, Technical University of Denmark, Miljøvej 115, 2800 Kgs. Lyngby, Denmark.

DOI: 10.1016/j.copbio.2019.03.006

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MeSH Terms: Bacteria, Environment, Genomics, Nitrites, Nitrous Oxide, Water Purification