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Nitrous oxide emission during wastewater treatment
Ist Teil von
Water research (Oxford), 2009-09, Vol.43 (17), p.4093-4103
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2009
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
Nitrous oxide (N
2O), a potent greenhouse gas, can be emitted during wastewater treatment, significantly contributing to the greenhouse gas footprint. Measurements at lab-scale and full-scale wastewater treatment plants (WWTPs) have demonstrated that N
2O can be emitted in substantial amounts during nitrogen removal in WWTPs, however, a large variation in reported emission values exists. Analysis of literature data enabled the identification of the most important operational parameters leading to N
2O emission in WWTPs: (i) low dissolved oxygen concentration in the nitrification and denitrification stages, (ii) increased nitrite concentrations in both nitrification and denitrification stages, and (iii) low COD/N ratio in the denitrification stage. From the literature it remains unclear whether nitrifying or denitrifying microorganisms are the main source of N
2O emissions. Operational strategies to prevent N
2O emission from WWTPs are discussed and areas in which further research is urgently required are identified.