| Title |
A Study on Control Parameters of TVFAs Fermentation with Swine Waste |
| Authors |
황규대(Gye Dae Whang),김민호(Min Ho Kim),김도연(Do Yeon Kim) |
| Abstract |
Bench scale fermenter fed with swine waste was operated to study the effects of fermentation temperature, initial VSS concentration and pH on the acids production rate. The experiment was carried out by varied mixture ratio of 1%, 5%, 10%, 20% and operating temperature of 15℃, 25℃, 35℃ and 45℃. It was determined that the VSS decay rate function is approximately first order with respect to the remaining VSS concentration. The VSS decay rate constant increased with temperature and temperature coefficient θ was estimated to be 1.027. Higher total volatile fatty acids(TVFAs) production rate was observed at higher solid concentration and temperature. The yield of TVFAs(as COD) ranged from 0.0603 to 0.8828g/gVSS destroyed. The TVFAs yields increased with temperature, but decreased with initial VSS concentration. Although the yield of TVFAs decreased with initial VSS concentration, the higher ratio of gSCOD produced per gVSS destroyed was observed. With in a pH range from 5 to 10, slightly higher TVAFs yields were observed at higher initial pH value but the effect of pH was negligible. Because fermented swine waste has relatively low nitrogen and phosphorous content and relatively high TVFAs, it can be used as a substitute for external carbon source in biological nutrient removal process. |