Journal
BIORESOURCE TECHNOLOGY
Volume 71, Issue 1, Pages 77-82Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0960-8524(99)00043-7
Keywords
anaerobic digestion; hydraulic retention time; thermophilic/mesophilic dual digestion; performance
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Three configurations for a dual digestion system were examined. The units were based on three 5 1 completely stirred tank reactors (CSTR). A first-stage thermophilic digester was used to provide the feed to each of the two second-stage mesophilic (35 degrees C) digesters. Using a mixture of sewage sludge and strong confectionery waste, the thermophilic digester was operated at 55 degrees C with a hydraulic retention time of 4 h. The mesophilic digesters were operated at hydraulic retention times of 8, 12 and 15 days. In terms of the reduction of volatile solids (VS), the three dual digestion configurations were similar but were more effective than the single-stage reactor which was used as a control. However, based on the specific methane yield (m(3) CH4/kg VS removed), the configuration with a first stage operating at 55 degrees C and a secondary digester at 35 degrees C with a hydraulic retention time of 12 days was the most effective. This configuration also maintained a more stable pH, irrespective of the quality of the feed sludge. (C) 1999 Elsevier Science Ltd. All rights reserved.
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