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Potential for rice straw ethanol production in the Mekong Delta, Vietnam

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  • Diep, Nhu Quynh
  • Sakanishi, Kinya
  • Nakagoshi, Nobukazu
  • Fujimoto, Shinji
  • Minowa, Tomoaki

Abstract

This study is to evaluate the potential for development of a cellulosic ethanol facility in Vietnam. Rice straw is abundant in Vietnam and highly concentrated in the Mekong Delta, where about 26 Mt year−1 of rice straw has been yearly produced. To minimize the overall production cost (PC) of ethanol from rice straw, it is crucial to choose the optimal facility size. The delivered cost of rice straw varied from 20.5 to 65.4 $ dry t−1 depending on transportation distance. The Mekong Delta has much lower rice straw prices compared with other regions in Vietnam because of high density and quantity of rice straw supply. Thus, this region has been considered as the most suitable location for deploying ethanol production in Vietnam. The optimal plant size of ethanol production in the region was estimated up to 200 ML year−1. The improvement in solid concentration of material in the hydrothermal pre-treatment step and using residues for power generation could substantially reduce the PC in Vietnam, where energy costs account for the second largest contribution to the PC, following only enzyme costs. The potential for building larger ethanol plants with low rice straw costs can reduce ethanol production costs in Vietnam. The current estimated production cost for an optimal plant size of 200 ML year−1 was 1.19 $ L−1. For the future scenario, considering improvements in pre-treatment, enzyme hydrolysis steps, specific enzyme activity, and applying residues for energy generation, the ethanol production cost could reduce to 0.45 $ L−1 for a plant size of 200 ML year−1 in Vietnam. These data indicated that the cost-competitiveness of ethanol production could be realized in Vietnam with future improvements in production technologies.

Suggested Citation

  • Diep, Nhu Quynh & Sakanishi, Kinya & Nakagoshi, Nobukazu & Fujimoto, Shinji & Minowa, Tomoaki, 2015. "Potential for rice straw ethanol production in the Mekong Delta, Vietnam," Renewable Energy, Elsevier, vol. 74(C), pages 456-463.
    • Handle: RePEc:eee:renene:v:74:y:2015:i:c:p:456-463
    DOI: 10.1016/j.renene.2014.08.051
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    References listed on IDEAS

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    1. Delivand, Mitra Kami & Barz, Mirko & Gheewala, Shabbir H., 2011. "Logistics cost analysis of rice straw for biomass power generation in Thailand," Energy, Elsevier, vol. 36(3), pages 1435-1441.
    2. Diep, Nhu Quynh & Fujimoto, Shinji & Minowa, Tomoaki & Sakanishi, Kinya & Nakagoshi, Nobukazu, 2012. "Estimation of the potential of rice straw for ethanol production and the optimum facility size for different regions in Vietnam," Applied Energy, Elsevier, vol. 93(C), pages 205-211.
    3. Perlack, R.D. & Turhollow, A.F., 2003. "Feedstock cost analysis of corn stover residues for further processing," Energy, Elsevier, vol. 28(14), pages 1395-1403.
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