期刊
BIORESOURCE TECHNOLOGY
卷 267, 期 -, 页码 347-355出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.07.056
关键词
Economic analysis; Cellulase recycling; Lignocellulosic ethanol; Recycled paper sludge
资金
- Portuguese Foundation for Science and Technology, Portugal (FCT) [UID/BIO/04469/2013, POCI-01-0145-FEDER-006684]
- FCT [SFRH/BD/88623/2012]
- [POCI-01-0145-FEDER-016403]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/88623/2012] Funding Source: FCT
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.
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