| Title |
Temperature Effects on Anaerobic Treatment of Wastewater in Fixed Film Digester |
| Authors |
양병수 ; 진현국 ; 정형숙 ( Byung Soo Yang ; Hyun Gook Jin ; Hyung Sook Chung ) |
| Abstract |
The effects of short-and long-term temperature change on organic removal rate and gas production rate were evaluated with the treating the synthetic wastewater composed of glucose and non-fat dry milk in an up flow floating anaerobic digester. Some results from this study are summarized as the followings. During the period referred to as a steady-state condition in an up flow floating anaerobic digester due to the fact that the relative changes in both COD removal rate and gas production rate are sufficiently small, biological solids continually accumulated as operating time elapsed. The activity of the accumulated biological solids could offset a decrease in organic removal rate and gas production rate because of temperature drop. These results imply that high organic removal efficiency can be obtained at even relatively low operating temperature when large biological solids is maintained in digesters. The composition of the produced biogas was nearly not changed during the short-term temperature drop and gas production resumed at the same rate as soon as the temperature restored to initial level. The effects of short-term temperature drop on attached growth anaerobes are not so significant as that on suspended growth anaerobes. It seemed to be because of the difference in biomass in digesters. |