title: Lactic acid production with undefined mixed culture fermentation of potato peel waste.
abstract: 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°C.
authors.affiliation: Environmental Science Program, University of Idaho, Moscow, ID 83844-3006, United States.
authors.forename: Shaobo
authors.initials: S
authors.lastname: Liang
authors.affiliation: Environmental Science Program, University of Idaho, Moscow, ID 83844-3006, United States; Renewable Materials Program, Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 83844-1132, United States. Electronic address: armandm@uidaho.edu.
authors.forename: Armando G
authors.initials: AG
authors.lastname: McDonald
authors.affiliation: Department of Civil Engineering, University of Idaho, Moscow, ID 83844-1022, United States.
authors.forename: Erik R
authors.initials: ER
authors.lastname: Coats
mesh_terms: D019149:Bioreactors; D005285:Fermentation; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D019344:Lactic Acid / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D011198:Solanum tuberosum / Q000737:chemistry*; D013696:Temperature
chemical_list: D007220:Industrial Waste; D019344:Lactic Acid
keywords: Lactic acid fermentation; Potato peel waste; Undefined mixed culture