Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 76, Issue -, Pages 51-58Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2017.03.027
Keywords
Streptomyces sp MDS; Solid state fermentation (SSF); Rice waste biomass (RWB); Bioethanol production; Decolorization
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Funding
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through Agricultural Research Center Project
- Agricultural-Bio Technology Development Program - Ministry of Agriculture, Food and Rural Affairs (MAFRA) [710003-07-7-SB120, 116075-3]
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This work evaluates lignocellulolytic enzymes production by a selected strain Streptomyces sp. MDS cultivated in various agricultural wastes under solid-state fermentation (SSF). Maximum activities (U/gds) of endoglucanase (132.6 +/- 1.15), exoglucanase (14.6 +/- 0.62), cellobiase (125.6 +/- 1.75), filter paperase (19.7 +/- 0.42), amylase (278.5 +/- 3.53), and xylanase (342.5 +/- 3.36) were produced with rice waste biomass (RWB). Operational parameters and supplementation of nitrogen sources, metal additives, and surfactants were systematically optimized with a view to maximizing enzyme production. The harvested enzyme exhibited good stability at high pH (5 to 8) and temperature (50 to 80 degrees C) and showed robust nature in the presence of organic solvents, surfactants, and commercial detergents. The potential of crude enzyme mixture for hydrolysis of mild alkaline pretreated RWB was demonstrated, resulting in equivalent saccharification (64.85 +/- 1.11%) relative to commercial enzymes (69.41 +/- 1.15%). Yeast co-culture of Saccharomyces cerevisiae and Kluyveromyces marxianus resulted in higher ethanol production (21.12 +/- 0.82 g/L) and sugar consumption (88%) from enzymatic RWB hydrolysates (50 g/L) than monoculture. Finally, the leftover spent slurry from SSF effectively decolorized individual dyes and the actual textile wastewater, which increases the practical applicability of the developed bioprocess. (C) 2017 Published by Elsevier B.V. on behalf of Taiwan Institute of Chemical Engineers.
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