Methane Fermentation Treatment of Nitrogen-Rich Resources with Biogas Circulation

H. Oshibe, N. Osaka, T. Matsui & K. Kida
Methane fermentation experiments were conducted at bench scale and pilot scale for treatment of nitrogen­rich resources, using milk as the feedstock. Ammonia stripping was applied to reduce ammonia inhibition by circulating biogas to the methane fermenter. In the pilot experiment, 115 kg/day of milk was treated, corresponding to a volatile total solids (VTS) loading rate of 4.9 kg/(L·d). During operation, the produced biogas was washed in a water tank and a portion of the water­washed...