title: Lactic acid production from potato peel waste by anaerobic sequencing batch fermentation using undefined mixed culture.
abstract: Lactic acid (LA) is a necessary industrial feedstock for producing the bioplastic, polylactic acid (PLA), which is currently produced by pure culture fermentation of food carbohydrates. This work presents an alternative to produce LA from potato peel waste (PPW) by anaerobic fermentation in a sequencing batch reactor (SBR) inoculated with undefined mixed culture from a municipal wastewater treatment plant. A statistical design of experiments approach was employed using set of 0.8L SBRs using gelatinized PPW at a solids content range from 30 to 50 g L(-1), solids retention time of 2-4 days for yield and productivity optimization. The maximum LA production yield of 0.25 g g(-1) PPW and highest productivity of 125 mg g(-1) d(-1) were achieved. A scale-up SBR trial using neat gelatinized PPW (at 80 g L(-1) solids content) at the 3 L scale was employed and the highest LA yield of 0.14 g g(-1) PPW and a productivity of 138 mg g(-1) d(-1) were achieved with a 1 d SRT.
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 8323844-1132, 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: D000693:Anaerobiosis; D019149:Bioreactors; D005285:Fermentation; D005502:Food; D019344:Lactic Acid / Q000378:metabolism*; D011198:Solanum tuberosum / Q000737:chemistry*; D062611:Solid Waste / Q000032:analysis*; D018505:Waste Management / Q000379:methods*
chemical_list: D062611:Solid Waste; D019344:Lactic Acid
keywords: Anaerobic fermentation; Lactic acid; Potato peel waste; Sequencing batch reactor; Undefined mixed culture