Abstract
The greenhouse gas emissions froom small wastewater treatment plants (WWTPs) in Japan were studied within the confine of the operation phase of the WWTPs. As the oxidation ditch process (OD)has been adopted mostly in small scale wastewater treatment plants, our study focusing on WWTPs using OD process as an water treatment method. The ratios of greenhouse gas emission to total treated wastewater of WWTPs declined over the first five-year.
