抄録
In this paper we evaluate profitability of the Present and Plan scenario on swine waste water treatment in suburban agricultural area by calculating cost and income. Present is composed discharging processed swine waste water into river and farming with chemical fertilizer application, while, in Plan, electricity and heat produced by methane fermentation and cogeneration system. The fermentation residue, which is digested slurry, also utilize as liquid fertilizer. From trial calculation, economic merit of local production for local consumption has become apparent as cost paid to local industry account for 44% in Plan against 7% in Present.
