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Development of an efficient process for the treatment of residual sludge discharged from an anaerobic digester in a sewage treatment plant |
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| Authors: | Abe Naoki Tang Yue-Qin Iwamura Makoto Ohta Hiroto Morimura Shigeru Kida Kenji |
| Affiliation: | a Hitachi Plant Technologies Ltd., 5-2 Higashi-Ikebukuro 4-Chome, Toshima-ku, Tokyo 170-8466, Japan b Department of Energy and Resources Engineering, College of Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China c Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan |
| Abstract: | In order to reduce the discharge of residual sludge from an anaerobic digester, pre-treatment methods including low-pressure wet-oxidation, Fenton oxidation, alkali treatment, ozone oxidation, mechanical destruction and enzymatic treatment were evaluated and compared. VSS removal efficiencies of greater than 50% were achieved in cases of low-pressure wet-oxidation, Fenton oxidation and alkali treatment. Residual sludge from an anaerobic digester was pre-treated and subjected to thermophilic anaerobic digestion. As a result, the process of low-pressure wet-oxidation followed by anaerobic digestion achieved the highest VSS removal efficiency of 83%. The total efficiency of VSS removal of sewage sludge consisting of primary and surplus sludge would be approximately 92%, assuming that the VSS removal efficiency of sewage sludge is 50% in the anaerobic digester of the sewage treatment plant. |
| Keywords: | Residual sludge Thermophilic anaerobic digestion Low-pressure wet-oxidation Fenton oxidation Alkali treatment |
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