title: Recovery of lactic acid by repeated batch electrodialysis and lactic acid production using electrodialysis wastewater.
abstract: Repeated batch electrodialysis for lactic acid recovery was investigated using lactic acid solution and fermentation broth. In both cases, lactate fluxes averaged more than 7.0 moles/m2.h, lactate recovery reached more than 99% for all the batch runs, and specific energy consumption per unit lactate transported was lower than 0.25 kWh/kg-lactate. When electrodialysis wastewater was used as a fermentation medium, supplemented with 100 g/l glucose, up to 92.4 g/l lactic acid was produced with a productivity of 0.67 g/l.h. In addition, when electrodialysis wastewater was supplemented with 150 g/l whole-corn flour hydrolyzate and 5 g/l corn steep liquor, 2.5-fold and 1.8-fold increases in lactic acid productivity and maximum cell growth, respectively, were achieved, as compared with lactic acid fermentation using electrodialysis wastewater supplemented with glucose only.
authors.affiliation: School of Biological Sciences and Technology, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Korea.
authors.forename: Young-Jung
authors.initials: YJ
authors.lastname: Wee
authors.forename: Jong-Sun
authors.initials: JS
authors.lastname: Yun
authors.forename: Yoon Y
authors.initials: YY
authors.lastname: Lee
authors.forename: An-Ping
authors.initials: AP
authors.lastname: Zeng
authors.forename: Hwa-Won
authors.initials: HW
authors.lastname: Ryu
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods; D003956:Dialysis / Q000379:methods*; D004563:Electrochemistry / Q000379:methods*; D013293:Enterococcus faecalis / Q000254:growth & development / Q000378:metabolism*; D005240:Feasibility Studies; D007220:Industrial Waste / Q000517:prevention & control; D019344:Lactic Acid / Q000096:biosynthesis* / Q000302:isolation & purification*; D010865:Pilot Projects; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism; D018508:Water Purification / Q000379:methods
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D019344:Lactic Acid