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Energies 2017, 10(7), 940; https://doi.org/10.3390/en10070940

Crop Factors Influencing Ethanol Production from Sorghum Juice and Bagasse

Department of Agricultural Sciences, University of Bologna, Viale Fanìn 44, 40127 Bologna, Italy
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Academic Editor: Talal Yusaf
Received: 20 April 2017 / Revised: 13 June 2017 / Accepted: 3 July 2017 / Published: 7 July 2017
(This article belongs to the Section Energy Sources)
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Abstract

This study investigated the effects of two soil moisture levels (SM) (30% and 70% soil available water) and three harvests (90 days, 118 days, and 151 days after seeding) on sweet (S506) and fiber (B133) sorghum genotypes under rain-sheltered conditions. Juice and bagasse-derived ethanol and their sum (EtOHBJ, EtOHB, and EtOHJ+B, respectively) were assessed. Water use efficiency (WUE) was determined for sorghum dry weight (DW) and EtOHJ+B. S506 had similar DW, but higher sugar content than B133, resulting in higher EtOHJ (+32%) and EtOHJ+B (+9%). High SM-enhanced DW, juice and sugars content, determining a strong EtOHJ+B increase (+99% vs. low SM). Late harvest enhanced DW and EtOHJ+B (+107% vs. early harvest), despite decreasing extractives and increasing structural fiber components. Water use efficiency of EtOHJ+B improved with high vs. low SM, although differences faded in late harvest. Upscale of EtOHJ+B and WUE data indicated a range of 21,000–82,000 ha of sorghum cultivation and 60–117 Mm3 of irrigation water, as amounts of resources needed to supply an 85,000 m3·yr−1 bio-ethanol plant. This large variation in land and water needs depended on specific combinations between crop factors SM and harvests. View Full-Text
Keywords: biomass sorghum; first generation ethanol; second generation ethanol; simultaneous saccharification and fermentation; bagasse; water use efficiency; land and water resources biomass sorghum; first generation ethanol; second generation ethanol; simultaneous saccharification and fermentation; bagasse; water use efficiency; land and water resources
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Capecchi, L.; Nissen, L.; Modesto, M.; Di Girolamo, G.; Cavani, L.; Barbanti, L. Crop Factors Influencing Ethanol Production from Sorghum Juice and Bagasse. Energies 2017, 10, 940.

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