期刊
WASTE MANAGEMENT
卷 47, 期 -, 页码 28-33出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2015.04.022
关键词
Co-digestion; Food waste; Sewage sludge; Synergistic effect; Energy autarky
资金
- Oswald-Schulze-Foundation [AZ 1631/12]
- German Academic Exchange Service (DAAD) [FKZ: 521/no]
The effects of co-digestion of food waste in a municipal wastewater treatment plant (WWTP) were studied in batch tests. The results obtained were compared with the mass balance of a digester at a full-scale WWTP for a one-year period without and with the addition of co-substrate. The specific methane yield calculated from the balance was 18% higher than the one in the batch tests, suggesting a stimulation of methane generation by co-digestion. It was hypothesized that this increase was caused by shifting the C/N ratio of raw sludge (8.8) to a more favourable ratio of the added food waste (17.7). In addition, potential benefits by adding food waste for energy autarky was investigated. While just 25% of the total energy demand of the plant could be recovered by biogas generation when no co-substrate was fed, this percentage has more than doubled when food waste was added at a ratio of 10% (w/w).(c) 2015 Elsevier Ltd. All rights reserved.
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