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Effects of Operational Condition on N2O Production from Biological Nitrogen Removal Process  

Jang, Hyun-Sup ((주) 엑센)
Kim, Tae-Hyeong (경희대학교 건설환경공학부 및 환경연구센터)
Lee, Myoung-Joo (경희대학교 건설환경공학부 및 환경연구센터)
Hwang, Sun-Jin (경희대학교 건설환경공학부 및 환경연구센터)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.5, 2009 , pp. 547-555 More about this Journal
Abstract
The objectives of this research were focused on the effects of various operating parameters on nitrous oxide emission such as C/N ratio, ammonia concentration and HRT in the hybrid and suspension reactors. With the decreasing of C/N ratios, $N_2O$ emission rates in the both processes were increased because organic carbon source for denitrification was depleted. In case of biofilm reactor operated using medium, $N_2O$ release from the nitrification was not affected by the variation of ammonia concentration. But in the suspension reactor, $N_2O$ production from the nitrification was rapidly increased with the increase of ammonia. Nitrite accumulation caused by undesirable nitrification conditions could be a important reason for the increase in the $N_2O$ production from the aerobic reactor. And rapid increase in $N_2O$ production was reflected by the decrease of HRT, similar to the results observed in the results of ammonia loading changes. So it could be said that it is very important to put in consideration both its optimum conditions for wastewater treatment efficiency and suitable conditions for $N_2O$ diminish, simultaneously, in order to development an eco-friendly and advanced wastewater treatment, especially in BNR process.
Keywords
Nitrous oxide; Nitrification; Denitrification; Ammonia loading; HRT; C/N ratio;
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