期刊
WASTE MANAGEMENT
卷 32, 期 10, 页码 1821-1825出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2012.05.033
关键词
Anaerobic; Co-digestion; Cattle manure; Sewage sludge; Food waste; Ultrasound
资金
- Spanish Ministry for the Environment, Rural and Maritime Affairs
- Severo Ochoa
Anaerobic co-digestion strategies are needed to enhance biogas production, especially when treating certain residues such as cattle/pig manure. This paper presents a study of co-digestion of cattle manure with food waste and sewage sludge. With the aim of maximising biogas yields, a series of experiments were carried out under mesophilic and thermophilic conditions using continuously stirred-tank reactors, operating at different hydraulic residence times. Pretreatment with ultrasound was also applied to compare the results with those obtained with non-pretreated waste. Specific methane production decreases when increasing the OLR and decreasing HRT. The maximum value obtained was 603 LCH4/kg VSfeed for the co-digestion of a mixture of 70% manure, 20% food waste and 10% sewage sludge (total solid concentration around 4%) at 36 degrees C, for an OLR of 1.2 g VS/L day. Increasing the OLR to 1.5 g VS/L day led to a decrease of around 20-28% in SMP. Lower methane yields were obtained when operating at 55 degrees C. The increase in methane production when applying ultrasound to the feed mixtures does not compensate for the energy spent in this pretreatment. (c) 2012 Elsevier Ltd. All rights reserved.
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