Suppression of N<sub>2</sub>O Greenhouse Gas Emission Volume using the Flow Equalization Function in Johkasou

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  • INAMURA Shigeaki
    （公社）岩手県浄化槽協会岩手県浄化槽検査センター
  • EBIE Yoshitaka
    国立研究開発法人国立環境研究所 資源循環・廃棄物研究センター
  • YAMAZAKI Hiroshi
    東洋大学 理工学部都市環境デザイン学科

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Other Title
  • 浄化槽における流量調整機能による温室効果ガスN<sub>2</sub>O排出量の抑制効果
  • 浄化槽における流量調整機能による温室効果ガスN₂O排出量の抑制効果
  • ジョウカソウ ニ オケル リュウリョウ チョウセイ キノウ ニ ヨル オンシツ コウカ ガス N ₂ O ハイシュツリョウ ノ ヨクセイ コウカ

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Abstract

 Emission volumes of the greenhouse gas N2O from small-scale johkasou are around five times higher than those from sewers. In this study, we focused on fluctuations in the flow rate of johkasou and compared the N2O emission volumes of johkasou with a flow equalization function, for leveling out variations in volume of inflow over time, and of those without. The comparison showed that N2O emission volumes from johkasou equipped with a flow equalization function are one sixth of those from johkasou without the function or lower. This is because fitting a flow equalization function alleviates the concentration of wastewater that is sent from the primary treatment to the secondary treatment This is believed to be able to minimize the decrease in oxygen reduction potential (ORP) at the secondary treatment. Furthermore, through this study, ORP appears to be a more appropriate indicator for controlling N2O emission volumes in johkasou than dissolved oxygen (DO).

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