Utilization of household food waste for the production of ethanol at high dry material content

Biotechnology for Biofuels

Leonidas Matsakas²  Dimitris Kekos³  Maria Loizidou¹  Paul Christakopoulos² 

[1] Unit of Environmental Science and Technology, School of Chemical Engineering, National Technical University of Athens, 5, Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece

[2] Department of Civil, Biochemical and Chemical Process Engineering, Division of Sustainable Process Engineering, Environmental and Natural Resources Engineering, Luleå University of Technology, SE 971 87 Luleå, Sweden

[3] Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 5 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece

关键词: Saccharomyces cerevisiae;    Subsequent fermentation;    Residue solids;    Household food waste;    Saccharification;    Liquefaction;    Ethanol;   

Others  :  794110
DOI  :  10.1186/1754-6834-7-4

 received in 2013-09-06, accepted in 2013-12-24,  发布年份 2014

【 摘 要 】

Background

Environmental issues and shortage of fossil fuels have turned the public interest to the utilization of renewable, environmentally friendly fuels, such as ethanol. In order to minimize the competition between fuels and food production, researchers are focusing their efforts to the utilization of wastes and by-products as raw materials for the production of ethanol. household food wastes are being produced in great quantities in European Union and their handling can be a challenge. Moreover, their disposal can cause severe environmental issues (for example emission of greenhouse gasses). On the other hand, they contain significant amounts of sugars (both soluble and insoluble) and they can be used as raw material for the production of ethanol.

Results

Household food wastes were utilized as raw material for the production of ethanol at high dry material consistencies. A distinct liquefaction/saccharification step has been included to the process, which rapidly reduced the viscosity of the high solid content substrate, resulting in better mixing of the fermenting microorganism. This step had a positive effect in both ethanol production and productivity, leading to a significant increase in both values, which was up to 40.81% and 4.46 fold, respectively. Remaining solids (residue) after fermentation at 45% w/v dry material (which contained also the unhydrolyzed fraction of cellulose), were subjected to a hydrothermal pretreatment in order to be utilized as raw material for a subsequent ethanol fermentation. This led to an increase of 13.16% in the ethanol production levels achieving a final ethanol yield of 107.58 g/kg dry material.

Conclusions

In conclusion, the ability of utilizing household food waste for the production of ethanol at elevated dry material content has been demonstrated. A separate liquefaction/saccharification process can increase both ethanol production and productivity. Finally, subsequent fermentation of the remaining solids could lead to an increase of the overall ethanol production yield.

【 授权许可】

   
2014 Matsakas et al.; licensee BioMed Central Ltd.

【 图 表 】

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