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Direct fermentation of sweet potato to produce maximal hydrogen and ethanol

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  • Chu, Chen-Yeon
  • Sen, Biswarup
  • Lay, Chyi-How
  • Lin, Yi-Chun
  • Lin, Chiu-Yue

Abstract

The feasibility of biofuels (hydrogen and ethanol) production from sweet potato without any pretreatment was evaluated using response surface methodology. Batch experiments were carried out with cow dung and anaerobic sewage sludge seeds at a temperature of 35°C, pH of 4.5–8.5 and substrate concentrations of 50–250g/L. The maximum hydrogen production rate of 184.3mmol/L/d, maximum specific hydrogen production rate of 37.5mmol/gVSS/d and maximum hydrogen yield of 1.32mmol/gCODsubstrate was obtained with cow dung seed at pH 6.5 with a sweet potato concentration of 150g/L. The maximum ethanol concentration of 12.2gCOD/L was obtained at sweet potato 150g/L and an initial cultivation pH 8.5 with cow dung seed. The main soluble microbial products (SMPs) were ethanol, acetate and butyrate with small quantities of propionate at all pH values by both seeds. The maximum SMP of 34.6gCOD/L with a total volatile fatty acids concentration of 26.5gCOD/L was obtained at pH 7.4 and sweet potato concentration 200g/L with cow dung seed. Cow dung was a good seed source for directly producing biohydrogen and ethanol from sweet potato under mesophilic condition.

Suggested Citation

  • Chu, Chen-Yeon & Sen, Biswarup & Lay, Chyi-How & Lin, Yi-Chun & Lin, Chiu-Yue, 2012. "Direct fermentation of sweet potato to produce maximal hydrogen and ethanol," Applied Energy, Elsevier, vol. 100(C), pages 10-18.
    • Handle: RePEc:eee:appene:v:100:y:2012:i:c:p:10-18
    DOI: 10.1016/j.apenergy.2012.06.023
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    References listed on IDEAS

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    1. Sigurbjornsdottir, Margret Audur & Orlygsson, Johann, 2012. "Combined hydrogen and ethanol production from sugars and lignocellulosic biomass by Thermoanaerobacterium AK54, isolated from hot spring," Applied Energy, Elsevier, vol. 97(C), pages 785-791.
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    Cited by:

    1. Karim, Ahasanul & Islam, M. Amirul & Mishra, Puranjan & Yousuf, Abu & Faizal, Che Ku Mohammad & Khan, Md. Maksudur Rahman, 2021. "Technical difficulties of mixed culture driven waste biomass-based biohydrogen production: Sustainability of current pretreatment techniques and future prospective," Renewable and Sustainable Energy Reviews, Elsevier, vol. 151(C).
    2. Xia, Ao & Cheng, Jun & Ding, Lingkan & Lin, Richen & Song, Wenlu & Zhou, Junhu & Cen, Kefa, 2014. "Enhancement of energy production efficiency from mixed biomass of Chlorella pyrenoidosa and cassava starch through combined hydrogen fermentation and methanogenesis," Applied Energy, Elsevier, vol. 120(C), pages 23-30.
    3. Lay, Chyi-How & Sen, Biswarup & Huang, Shih-Ching & Chen, Chin-Chao & Lin, Chiu-Yue, 2013. "Sustainable bioenergy production from tofu-processing wastewater by anaerobic hydrogen fermentation for onsite energy recovery," Renewable Energy, Elsevier, vol. 58(C), pages 60-67.
    4. Soltan, Mohamed & Elsamadony, Mohamed & Tawfik, Ahmed, 2017. "Biological hydrogen promotion via integrated fermentation of complex agro-industrial wastes," Applied Energy, Elsevier, vol. 185(P1), pages 929-938.
    5. Zhang, Yan & Zhang, Fang & Chen, Man & Chu, Pei-Na & Ding, Jing & Zeng, Raymond J., 2013. "Hydrogen supersaturation in extreme-thermophilic (70°C) mixed culture fermentation," Applied Energy, Elsevier, vol. 109(C), pages 213-219.
    6. Xia, Ao & Jacob, Amita & Herrmann, Christiane & Murphy, Jerry D., 2016. "Fermentative bio-hydrogen production from galactose," Energy, Elsevier, vol. 96(C), pages 346-354.
    7. Xia, Ao & Cheng, Jun & Ding, Lingkan & Lin, Richen & Song, Wenlu & Su, Huibo & Zhou, Junhu & Cen, Kefa, 2015. "Substrate consumption and hydrogen production via co-fermentation of monomers derived from carbohydrates and proteins in biomass wastes," Applied Energy, Elsevier, vol. 139(C), pages 9-16.

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