Wet Oxidation Treatment of Organic Household Waste Enriched with Wheat Straw for Simultaneous Saccharification and Fermentation into Ethanol

Lissens, G., Klinke, H., Verstraete, W., Ahring, B. and Thomsen, A. B. (2004) Wet Oxidation Treatment of Organic Household Waste Enriched with Wheat Straw for Simultaneous Saccharification and Fermentation into Ethanol. Environmental Technology, 25 6: 647-655. doi:10.1080/09593330.2004.9619354


Author Lissens, G.
Klinke, H.
Verstraete, W.
Ahring, B.
Thomsen, A. B.
Title Wet Oxidation Treatment of Organic Household Waste Enriched with Wheat Straw for Simultaneous Saccharification and Fermentation into Ethanol
Journal name Environmental Technology   Check publisher's open access policy
ISSN 0959-3330
1479-487X
Publication date 2004
Sub-type Article (original research)
DOI 10.1080/09593330.2004.9619354
Volume 25
Issue 6
Start page 647
End page 655
Total pages 9
Place of publication London
Publisher Taylor & Francis
Language eng
Subject 090703 Environmental Technologies
Abstract Organic municipal solid waste enriched with wheat straw was subjected to wet-oxidation as a pre-treatment for subsequent enzymatic conversion and fermentation into bio-ethanol. The effect of temperature (185-195 °C), oxygen pressure (3-12 bar) and sodium carbonate (0-2 g l-1) addition on enzymatic cellulose and hemicellulose convertibility was studied at a constant wet oxidation retention time of 10 minutes. An enzyme convertibility assay at high enzyme loading (25 filter paper unit (FPU) g-1 dry solids (DS) added) showed that up to 78% of the cellulose and up to 68% of the hemicellulose in the treated waste could be converted into respectively hexose and pentose sugars compared to 46% for cellulose and 36% for hemicellulose in the raw waste. For all wet oxidation conditions tested, total carbohydrate recoveries were high (> 89%) and 44-66% of the original lignin could be converted into non-toxic carboxylic acids mainly (2.2-4.5 % on DS basis). Simultaneous saccharification and fermentation (SSF) of the treated waste at 10% DS by Saccharomyces cerevisae yielded average ethanol concentrations of 16.5 to 22 g l-1 for enzyme loadings of 5 and 25 FPU g-1 DS, respectively. The cellulose to ethanol conversion efficiency during SSF was 50, 62, 65 and 70% for a total enzyme loading of 5, 10, 15 and 25 FPU g-1 DS, respectively. Hence, this study shows that wet oxidation is a suitable pre-treatment for the conversion of organic waste carbohydrates into ethanol and that compatible conversion yields (60-65%) can be achieved at moderate enzyme loadings.
Keyword municipal solid waste
wheat straw
cellulose conversion efficiency
simultaneous saccharification
fermentation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
 
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