Effects of Water-saving Devices on Greenhouse gases emission from Johkasou.

Abstract

 Effects of water-saving devices on greenhouse gases emission from an on-site domestic wastewater treatment facility, Johkasou, were investigated. After installing water-saving devices, high CH₄ peak was observed under the normal operation condition, however, introduction of anaerobic-aerobic circulation reduced CH₄ emission. Considering greenhouse gases emission from water use, highest emission of 671.6 kg-CO₂ eq house^-1 year^-1 was estimated in the case of no water-saving devices and normal operation condition. Lowest emission of 418.2 kg-CO₂ eq house^-1 year^-1 was achieved with water-saving devices and anaerobic-aerobic circulation. It is clarified that introduction of water-saving devices and anaerobic-aerobic circulation reduce greenhouse gases emission by approximately 38%.