Development of Emissions Factor for the Decentralized Domestic Wastewater Treatment for the National Greenhouse Gas Inventory

Yoshitaka EBIE; Hiroshi YAMAZAKI; Shigeaki INAMURA; Yusuke JIMBO; Takuro KOBAYASHI; Hiroyuki UEDA

doi:10.2965/jwet.2014.33

Journal of Water and Environment Technology

Online ISSN : 1348-2165
ISSN-L : 1348-2165

Original Papers

Development of Emissions Factor for the Decentralized Domestic Wastewater Treatment for the National Greenhouse Gas Inventory

Yoshitaka EBIE, Hiroshi YAMAZAKI, Shigeaki INAMURA, Yusuke JIMBO, Takuro KOBAYASHI, Hiroyuki UEDA

Author information

Yoshitaka EBIE
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Japan
Hiroshi YAMAZAKI
Engineering Department, Ibaraki Pharmaceutical Association, Japan
Shigeaki INAMURA
Iwate Johkasou Inspection Center, Japan
Yusuke JIMBO
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Japan
Takuro KOBAYASHI
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Japan
Hiroyuki UEDA
Environment and Energy Department, Mitsubishi UFJ Research and Consulting, Japan

Corresponding author

ORCID

Keywords: greenhouse gas emission, inventory, Johkasou, vault toilet

JOURNAL FREE ACCESS

2014 Volume 12 Issue 1 Pages 33-41

DOI https://doi.org/10.2965/jwet.2014.33

Details

Published: 2014 Received: May 13, 2013 Released on J-STAGE: February 10, 2014 Accepted: August 10, 2013 Advance online publication: - Revised: -

Abstract

Methane and N₂O emissions were measured simultaneously in three types of decentralized wastewater treatment facilities to develop new emission factors (EFs) in Japan. Considering the ratio of the actual load to designed load and elapsed time from last desludging, 24 sites for Johkasou treating domestic wastewater, 6 sites for Johkasou treating night soil only, and 30 sites for vault toilet were selected. Gas samples were collected in the morning, afternoon, and evening for every Johkasou site. The investigation was conducted in summer and winter to estimate the annual average EFs. The EFs of CH₄ and N₂O of both Johkasou were higher than that used in the national greenhouse gas inventory in 2012, whereas the CH₄ and N₂O EFs of vault toilet were lower. Especially, N₂O EF was only 1% of the national inventory in 2012, and almost zero. According to the results of these three types of decentralized wastewater treatment facilities, the emissions of CO₂eq in FY2010 were 1.77 times higher than the national inventory.

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