Digestion of waste bananas to generate energy in Australia

Clarke, W. P., Radnidge, P., Lai, T., Jensen, P. and Hardin, M. T. (2008) Digestion of waste bananas to generate energy in Australia. Waste Management, 28 3: 527-533. doi:10.1016/j.wasman.2007.01.012

Author Clarke, W. P.
Radnidge, P.
Lai, T.
Jensen, P.
Hardin, M. T.
Title Digestion of waste bananas to generate energy in Australia
Journal name Waste Management   Check publisher's open access policy
ISSN 0956-053X
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.wasman.2007.01.012
Open Access Status DOI
Volume 28
Issue 3
Start page 527
End page 533
Total pages 7
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject 0907 Environmental Engineering
969999 Environment not elsewhere classified
Abstract This paper presents results from laboratory studies to measure the methane yield and rate of digestion of reject bananas. These parameters were determined in experiments that took into account the likely configuration of a full-scale plant in the banana growing region of north Queensland. The digestion was conducted in a 200-l reactor using fed-batch operation, relying entirely on the natural microbial consortia on the reject bananas to avoid reliance on external inocula such as sludge, an undesirable material around food packaging facilities. An enrichment culture was first established in a highly buffered 200-l batch digestion unit. The fed-batch digester was then started by exchanging leachate with the mature batch reactor. Under loading conditions of 0.6 kg VS m d over 70 days where the average working volume was 160 l, the digester produced 398 ± 20 l CH kg VS. Increasing the loading rate to 1.6 kg VS m d resulted in a reduced methane yield of 210 l CH kg VS over 23 days of operation, with a concomitant accumulation of banana waste in the digester. The leachate at the end of digestion contained over 4000 mg l K, 200 mg l N and 75 mg l, levels that exceed acceptable limits for general agricultural irrigation.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Created: Fri, 17 Apr 2009, 01:41:57 EST by Gail Smith on behalf of School of Civil Engineering