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Integrated Economic and Environmental Assessment of Biogas and Bioethanol Production from Cassava Cellulosic Waste

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Abstract

Cassava cellulosic waste, or cassava bagasse or pulp, is a solid waste generated from both the coarse and fine extraction processes used for producing starch. Current disposal alternatives, such as selling the wet or dried pulp for animal feed, do not provide a high economic value. Furthermore, when stored at the factory the resulting microbial fermentation of the waste causes environmental pollution and a strong odor. The pulp still has a high starch content and so is suitable for other utilization purposes. The aim of this research was to use a direct economic and environment cost model to assess three potential high value-added renewable energy utilization alternatives for cassava pulp utilization to help define appropriate option(s) for on-site pulp management. The selected utilization options were the production of (i) biogas for heat generation, (ii) biogas for electricity generation and (iii) bioethanol. Primary and secondary data were collected from the literature, surveys and field data. The boundaries of data collection were set as gate-to-gate of a new unit in an existing starch factory with a receiving capacity of 500 t/d of pulp (equivalent to the pulp produced from a 200-t starch factory). The total production cost of each cassava pulp utilization option was calculated from both the economic and environmental cost. The most economically attractive scenario was the production of biogas for heat generation since it gave the highest net present value (NPV), net cash flow and return on sale. The biogas for heat generation option has the highest NPV sensitivity value in all case studies.

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Acknowledgements

This research was supported by the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No. 2.B.KT/52/N1) to Ms. Sivalee Trakulvichean and Dr. Warinthorn Songkasiri. We gratefully acknowledge Choncharoen Co., Ltd. and other starch factories for information.

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Authors and Affiliations

  1. Division of Biotechnology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi (KMUTT), 49 Soi Tiantalay 25, Thakham, Bangkhuntien, Bangkok, 10150, Thailand

    Sivalee Trakulvichean & Pawinee Chaiprasert

  2. Faculty of Economics, Food Security Research Center, Novosibirsk State University, 2 Pirogova Str., Novosibirsk, Russia, 630090

    Julia Otmakhova

  3. Excellent Center for Waste Utilization and Management (ECoWaste), National Center for Genetic Engineering and Biotechnology (BIOTEC), PDTI Building, Bangkhuntien, Bangkok, 10150, Thailand

    Warinthorn Songkasiri

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  1. Sivalee Trakulvichean
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  2. Pawinee Chaiprasert
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  3. Julia Otmakhova
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  4. Warinthorn Songkasiri
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Correspondence to Warinthorn Songkasiri.

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Trakulvichean, S., Chaiprasert, P., Otmakhova, J. et al. Integrated Economic and Environmental Assessment of Biogas and Bioethanol Production from Cassava Cellulosic Waste. Waste Biomass Valor 10, 691–700 (2019). https://doi.org/10.1007/s12649-017-0076-x

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  • DOI: https://doi.org/10.1007/s12649-017-0076-x

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