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Nitrogen removal enhancement and nitrous oxide emission reduction by activated sludge with pulse aeration
Ist Teil von
Process safety and environmental protection, 2019-09, Vol.129, p.40-46
Ort / Verlag
Rugby: Elsevier B.V
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
•No nitrite and nitrate accumulation in the pulse aerated reactor.•Activities of the nitrate reductase and the nitrite reductase were enhanced by pulse aeration.•N2O emission reduction was achieved by pulse aeration.
This paper aimed to reveal the dynamic changes of the concentrations of nitrogen transformation intermediates and the emission of the greenhouse gas nitrous oxide (N2O) of the activated sludge with pulse aeration. The results indicated that the total nitrogen (TN) removal performed better and there were no nitrite and nitrate accumulation in the pulse aerated reactor. Specific oxygen utilization rate (SOUR) and dehydrogenase activity (DHA) of the activated sludge with pulse aeration were lower than those with continuous aeration, which was in agreement with the COD removal efficiency. The specific ammonia utilization rate (SAUR) and the specific nitrite utilization rate (SNUR) decreased with time from 0.43 to 0.32mg/(g MLSS·min) and from 0.28 to 0.12mg/(g MLSS·min), respectively. Meanwhile, the nitrate reductase activity (NARA) and the nitrite reductase activity (NIRA) enhanced from 0.93 to 1.67mg/(mL·d) and from 1.19 to 1.62mg/(mL·d), respectively. The advance of NIRA in the denitrification process played a more important role in the non-accumulation of nitrite, which led to less N2O emission by pulse aeration.