Details

Autor(en) / Beteiligte

• Gomes, Daniel G.
• Serna-Loaiza, Sebastián
• Cardona, Carlos A.
• Gama, Miguel
• Domingues, Lucília

Titel

Insights into the economic viability of cellulases recycling on bioethanol production from recycled paper sludge

Ist Teil von

• Bioresource technology, 2018-11, Vol.267, p.347-355

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •Ethanol production from recycled paper sludge showed to be economically viable.•Integrating cellulases recycling resulted on a superior economic performance.•Solid fraction recovery enabled a superior total ethanol production.•Enzyme recycling is economically viable unless enzyme price decreases at least 34%. The economics of Recycled Paper Sludge conversion into ethanol was here assessed with emphasis on integrating a cellulase recycling system. Without cellulases recycling this process presented positive economic outputs (payback period of 7.85 years; 10.90 Million US$ of accumulated NPV) despite the modest ethanol titers. Recycling both free and solid-bound enzymes allowed considerable savings of enzyme but also an increase on annual costs (0.88%), resulting on a superior economic output: payback period decreased to 7.25 years; accumulated NPV increased to 14.44 Million US$. Recycling exclusively the liquid fraction enabled a clear costs reduction, however, also total ethanol decreased, attenuating the abovementioned benefits. Targeting higher ethanol concentrations, superior solids consistencies were also evaluated. Despite a costs reduction, total ethanol decreased due to a higher ethanol retention on the solid. A sensitivity analysis further revealed that the cost of enzymes and ultrafiltration membrane may be critical on enzyme recycling economic feasibility.