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Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock

CICECO–Aveiro Institute of Materials, Chemistry Department, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal
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Fermentation 2019, 5(1), 4; https://doi.org/10.3390/fermentation5010004
Received: 30 October 2018 / Revised: 1 December 2018 / Accepted: 19 December 2018 / Published: 24 December 2018
(This article belongs to the Special Issue Microbial Production of Added-value Products from Renewable Resources)
Due to the health and environment impacts of fossil fuels utilization, biofuels have been investigated as a potential alternative renewable source of energy. Bioethanol is currently the most produced biofuel, mainly of first generation, resulting in food-fuel competition. Second generation bioethanol is produced from lignocellulosic biomass, but a costly and difficult pretreatment is required. The pulp and paper industry has the biggest income of biomass for non-food-chain production, and, simultaneously generates a high amount of residues. According to the circular economy model, these residues, rich in monosaccharides, or even in polysaccharides besides lignin, can be utilized as a proper feedstock for second generation bioethanol production. Biorefineries can be integrated in the existing pulp and paper industrial plants by exploiting the high level of technology and also the infrastructures and logistics that are required to fractionate and handle woody biomass. This would contribute to the diversification of products and the increase of profitability of pulp and paper industry with additional environmental benefits. This work reviews the literature supporting the feasibility of producing ethanol from Kraft pulp, spent sulfite liquor, and pulp and paper sludge, presenting and discussing the practical attempt of biorefineries implementation in pulp and paper mills for bioethanol production. View Full-Text
Keywords: bioethanol; pulp and paper industry; lignocellulosic biomass; kraft pulp; spent sulfite liquor; pulp and paper sludge bioethanol; pulp and paper industry; lignocellulosic biomass; kraft pulp; spent sulfite liquor; pulp and paper sludge
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Branco, R.H.R.; Serafim, L.S.; Xavier, A.M.R.B. Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock. Fermentation 2019, 5, 4.

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