NDLI: Effects of loading rate and aeration on nitrogen removal and N2O emissions in intermittently aerated sequencing batch reactors treating slaughterhouse wastewater at 11 °C

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Effects of loading rate and aeration on nitrogen removal and N2O emissions in intermittently aerated sequencing batch reactors treating slaughterhouse wastewater at 11 °C

Content Provider	Springer Nature Link
Author	Pan, Min Hu, Zhenhu Liu, Rui Zhan, Xinmin
Copyright Year	2014
Abstract	This study aimed to find optimal operation conditions for nitrogen removal from high strength slaughterhouse wastewater at 11 °C using the intermittently aerated sequencing batch reactors (IASBRs) so as to provide an engineering control strategy for the IASBR technology. Two operational parameters were examined: (1) loading rates and (2) aeration rates. Both the two parameters affected variation of DO concentrations in the IASBR operation cycles. It was found that to achieve efficient nitrogen removal via partial nitrification–denitrification (PND), “DO elbow” point must appear at the end of the last aeration period. There was a correlation between the ammonium oxidizing bacteria (AOB)/nitrite oxidizing bacteria (NOB) ratio and the average DO concentrations in the last aeration periods; when the average DO concentrations in the last aeration periods were lower than 4.86 mg/L, AOB became the dominant nitrifier population, which benefited nitrogen removal via PND. Both the nitrogen loading rate and the aeration rate influenced the population sizes of AOB and NOB. To accomplish efficient nitrogen removal via PND, the optimum aeration rate (A, L air/min) applied can be predicted according to the average organic loading rates based on mathematical equations developed in this study. The research shows that the amount of N2O generation in the aeration period was reduced with increasing the aeration rate; however, the highest N2O generation in the non-aeration period was observed at the optimum aeration rates.
Starting Page	681
Ending Page	689
Page Count	9
File Format	PDF
ISSN	16157591
Journal	Bioprocess Engineering
Volume Number	38
Issue Number	4
e-ISSN	16157605
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aeration Intermittent aeration Loading rate Nitrous oxide emission Partial nitrification–denitrification Slaughterhouse wastewater Biotechnology Industrial and Production Engineering Environmental Engineering/Biotechnology Industrial Chemistry/Chemical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Medicine Bioengineering Biotechnology

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