Journal
WASTE MANAGEMENT
Volume 34, Issue 11, Pages 2022-2027Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2014.07.009
Keywords
Lactic acid fermentation; Potato peel waste; Undefined mixed culture
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Funding
- J.R. Simplot Company
- Waters Technologies Corporation
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Potato peel waste (PPW) as zero value byproduct generated from food processing plant contains a large quantity of starch, non-starch polysaccharide, lignin, protein, and lipid. PPW as one promising carbon source can be managed and utilized to value added bioproducts through a simple fermentation process using undefined mixed cultures inoculated from wastewater treatment plant sludge. A series of non-pH controlled batch fermentations under different conditions such as pretreatment process, enzymatic hydrolysis, temperature, and solids loading were studied. Lactic acid (LA) was the major product, followed by acetic acid (AA) and ethanol under fermentation conditions without the presence of added hydrolytic enzymes. The maximum yields of LA, AA, and ethanol were respectively, 0.22 g g(-1), 0.06 g g(-1), and 0.05 g g(-1). The highest LA concentration of 14.7 g L-1 was obtained from a bioreactor with initial solids loading of 60 g L-1 at 35 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
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