Journal
WASTE MANAGEMENT
Volume 33, Issue 5, Pages 1282-1289Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2013.01.034
Keywords
Anaerobic digestion; Biochemical methane potential (BMP); Dry digestion; Leach bed; Food waste fraction of source separated municipal solid waste; Tracer test
Categories
Funding
- Swedish Gas Technology Centre
- Swedish Energy Agency
- Swedish waste management
- Scania regional council environmental protection foundation
- Vafab Miljo AB
- Svensk Vaxtkraft AB
- NSR AB
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At the waste handling company NSR, Helsingborg, Sweden, the food waste fraction of source separated municipal solid waste is pretreated to obtain a liquid fraction, which is used for biogas production, and a dry fraction, which is at present incinerated. This pretreatment and separation is performed to remove impurities, however also some of the organic material is removed. The possibility of realising the methane potential of the dry fraction through batch-wise dry anaerobic digestion was investigated. The anaerobic digestion technique used was a two-stage process consisting of a static leach bed reactor and a methane reactor. Treatment of the dry fraction alone and in a mixture with structural material was tested to investigate the effect on the porosity of the leach bed. A tracer experiment was carried out to investigate the liquid flow through the leach beds, and this method proved useful in demonstrating a more homogenous flow through the leach bed when structural material was added. Addition of structural material to the dry fraction was needed to achieve a functional digestion process. A methane yield of 98 m(3)/ton was obtained from the dry fraction mixed with structural material after 76 days of digestion. This was in the same range as obtained in the laboratory scale biochemical methane potential test, showing that it was possible to extract the organic content in the dry fraction in this type of dry digestion system for the production of methane. (C) 2013 Elsevier Ltd. All rights reserved.
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