Journal
BIORESOURCE TECHNOLOGY
Volume 203, Issue -, Pages 103-111Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.12.028
Keywords
Paper sludge; Bioethanol; Simultaneous saccharification and fermentation; Fed-batch culture; High-solids fermentation
Funding
- Paper Making Association of South Africa (PAMSA)
- Fiber Processing and Manufacturing Skills Education Training Authorities
- National Research Foundation of South Africa [UID 92522]
- Mpact Paper
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Paper sludge (PS) from the paper and pulp industry consists primarily of cellulose and ash and has significant potential for ethanol production. Thirty-seven PS samples from 11 South African paper and pulp mills exhibited large variation in chemical composition and resulting ethanol production. Simultaneous saccharification and fermentation (SSF) of PS in fed-batch culture was investigated at high solid loadings and low enzyme dosages. Water holding capacity and viscosity of the PS influenced ethanol production at elevated solid loadings of PS. High viscosity of PS from virgin pulp mills restricted the solid loading to 18% (w/w) at an enzyme dosage of 20 FPU/gram dry PS (gdPS), whereas an optimal solid loading of 27% (w/w) was achieved with corrugated recycle mill PS at 11 FPU/gdPS. Ethanol concentration and yield of virgin pulp and corrugated recycle PS were 34.2 g/L at 66.9% and 45.5 g/L at 78.2%, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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