Recovery of lactic acid by repeated batch electrodialysis and lactic acid production using electrodialysis wastewater.
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.
Wee
Young-Jung
YJ
School of Biological Sciences and Technology, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Korea.
Yun
Jong-Sun
JS
Lee
Yoon Y
YY
Zeng
An-Ping
AP
Ryu
Hwa-Won
HW
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
D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D019344:Lactic Acid