Abstract
Effluent from anaerobic digestor of swine wastewater (EDSW) was treated by a photosynthetic bcterium Rhodobacter sphaeroides S under aerobic-dark condition. Organic matter (CODcr) and lower fatty acids in the effluent were effectively removed in batch treatment indicating that this organism was suitable for the treatment of EDSW. Continuous treatments of the effluent were performed to elucidate the fundamental growth characteristics of this organism such as the maximum specific growth rate, μm and the growth yield for COD removal, Y. Based on the values of μm (3.05 1/day), Y (0.52 g/g) and other growth characteristics obtained, a new treatment process was proposed. In this process, estimation of the scale of the aeration and sediment vessels for the treatment were carried out based on the waste from 4, 000 pigs house. As the results, the volume of aeration and sediment vessels might be reduced to ca. 1/6 and ca. 1/2, respectively, compared with the conventional activated sludge treatment process.
