| Title |
Study on Model of Autothermal Thermophilic Aerobic Digestion Process of Sludge |
| Authors |
이윤석 ; 안승구 ( Yun Seok Yi ; Seung Koo Ahn ) |
| Abstract |
Models of the autothermal thermophilic aerobic digestion process for stabilization and pasteurization of sewage sludge were proposed. They can be applied to the continuous and semi-continuous operations in completely stirred tank reactor. Oxygen concentration term was added to the first order reaction kinetic to investigate the influence of the oxygen concentration on the reaction rate. Sludge was considered as a nonnewtonian (pseudoplastic) fluid. For the effective operation of the process the sludge concentration must be high and the thermal protection of the reactor with isolation material should be required. The RPM of turbine impeller and the air supply velocity must be selected on the basis not only of the organic removal rate but also of the efficiency; quantity of the removal organics per unit energy input. Also the semi-continuous operation appears one of the most effective process for the stabilization and pasteurization of the sludge. |