Journal
WASTE MANAGEMENT
Volume 32, Issue 10, Pages 1821-1825Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2012.05.033
Keywords
Anaerobic; Co-digestion; Cattle manure; Sewage sludge; Food waste; Ultrasound
Categories
Funding
- Spanish Ministry for the Environment, Rural and Maritime Affairs
- Severo Ochoa
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available