| Title |
An Experimental Study on the Effect of Digestion Process and Temperature in the Digestion of Biological Sludge |
| Authors |
김성홍(Seong Hong Kim),최영균(Young Gyun Choi),정태학(Tai Hak Chung) |
| Abstract |
Batch digestion experiments were carried out to investigate the effect of digestion type and temperature on solids reduction and nitrogen release and transformation. Solids reduction kinetics can be well expressed by exponential decay equation with 2 parameters for aerobic or intermittent aerobic digestion and aerobic digestion is the fastest among 3 types. As the digestion temperature increases, decay constant is increased by 1.044 of temperature sensitivity coefficient. Oxygen deficit is very effective method to kill and dissolve aerobic organism, but this does not mean that solids reduction rate is higher in anaerobic digestion than aerobic or intermittent aerobic digestion. Organic nitrogen released from organisms is accumulated as ammonia nitrogen in anaerobic digestion. But released nitrogen is accumulated as nitrate nitrogen in aerobic digestion until the available alkalinity is exhausted. Nitrification is partially possible after the available alkalinity is exhausted because alkalinity is produced by the hydrolysis of biomass. Nitrogen removal is the highest in the intermittent aerobic digestion and the efficiency is up to 57% for 34 days. |