title: Potential of the waste from beer fermentation broth for bio-ethanol production without any additional enzyme, microbial cells and carbohydrates.
abstract: The potential of the waste from beer fermentation broth (WBFB) for the production of bio-ethanol using a simultaneous saccharification and fermentation process without any extra additions of saccharification enzymes, microbial cells or carbohydrate was tested. The major microbial cells in WBFB were isolated and identified. The variations in compositions of WBFB with stock time were investigated. There was residual activity of starch hydrolyzing enzymes in WBFB. The effects of reaction modes e.g. static and shaking on bio-ethanol production were studied. After 7 days of cultivation using the supernatant of WBFB at 30 °C the ethanol concentration reached 103.8 g/L in shaking culture and 91.5 g/L in static culture. Agitation experiments conducted at a temperature-profile process in which temperature was increased from 25 to 67 °C shortened the simultaneous process time. The original WBFB was more useful than the supernatant of WBFB in getting the higher concentration of ethanol and reducing the fermentation time. From this whole study it was found that WBFB is a cheap and suitable source for bio-ethanol production.
authors: Department of Chemical Engineering, Kyungpook National University, Taegu 702-701, Republic of Korea.
authors: Jung Hwan
authors: JH
authors: Ha
authors: Nasrullah
authors: N
authors: Shah
authors: Mazhar
authors: M
authors: Ul-Islam
authors: Joong Kon
authors: JK
authors: Park
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism; D061249:Batch Cell Culture Techniques / Q000379:methods; D001515:Beer; D056804:Biofuels; D001951:Brevibacterium / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D002175:Candida / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D003470:Culture Media / Q000032:analysis*; D000431:Ethanol / Q000302:isolation & purification*; D005285:Fermentation; D005516:Food Microbiology; D005656:Fungal Proteins / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D007220:Industrial Waste; D010376:Pediococcus / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D012441:Saccharomyces cerevisiae / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D013213:Starch / Q000378:metabolism; D013997:Time Factors
chemical_list: D001426:Bacterial Proteins; D056804:Biofuels; D003470:Culture Media; D005656:Fungal Proteins; D007220:Industrial Waste; D000431:Ethanol; D013213:Starch; D005947:Glucose