The Characteristics of N<sub>2</sub>O Production in Sequencing Batch Activated Sludge Process Treating Swine Wastewater

NISHIMURA OSAMU, MASUDA SHUHEI, GONOI KOJI, HARADA SHIGEKI, MIZUOCHI MOTOYUKI, INAMORI YUHEI

doi:10.2521/jswtb.45.13

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Other Title

豚舎排水を処理する回分式活性汚泥法におけるN<sub>2</sub>Oの発生特性
豚舎排水を処理する回分式活性汚泥法におけるN2Oの発生特性
トンシャハイスイオショリスルカイブンシキカッセイオデイホウニオケル N2O ノハッセイトクセイ

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Description

The profile of nitrous oxide (N₂O) production was examined for aerated lagoon (AL) and intermittent aeration sequencing batch reactor (IASBR) treating swine wastewater. N₂O production rate was 1.07×10¹～2.03×10³(mgN₂O－N/head/day) in AL and 2.83×10²～1.12×10³(mgN₂O－N/head/day) in IASBR. The emission of N₂O in aeration phase accounted for over 80％ of all N₂O emission in AL, and almost 100％ in IASBR. In AL, the N₂O emission rate increased in the last aeration phase due to the simultaneous occurrence of nitrification and aerobic denitrification. In IASBR, the N₂O emission was promoted by the accumulation of dissolved N₂O caused by stagnation of denitrificatoin in anaerobic phase and the occurrence of aerobic denitrificatoin caused by high concentration of organic matter carried over from anaerobic phase. It was suggested that the risk of N₂O emission in AL was higher than that in IASBR, because aerobic denitrification was promoted easily in aerobic phase, and the accumulation of dissolved N₂O lead to the gasification in the anaerobic phase in AL.

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Japanese Journal of Water Treatment Biology

Japanese Journal of Water Treatment Biology 45 (1), 13-22, 2009

Japanese Society of Water Treatment Biology

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