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Biomethane and ethanol production potential of Spirulina platensis algae and enzymatically saccharified switchgrass ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
3064 149 2015 9 PDF Available
Title
Biomethane and ethanol production potential of Spirulina platensis algae and enzymatically saccharified switchgrass ☆
Abstract

•No effect was found of adding algae powder on the activity of the enzymes used in the saccharification of switchgrass.•Methane yields significantly increased after alkaline pretreatment and enzymatic saccharification of switchgrass.•Reactors contained algae had high pH and produced biogas with high methane content.•Greater gross energy from switchgrass could be determined from biomethane production than from ethanol production.

The gross energy production potentials in the form of biomethane and ethanol were determined for Spirulina platensis algae and enzymatically saccharified switchgrass. S. platensis algae alone, switchgrass alone, and a mixture of both (composed of 50% of each material, based on total solids) were anaerobically digested at 50 °C for 30 days. Enzymatic saccharification of switchgrass was pretreated by sodium hydroxide (1% (w/w)) for 12 hr at 50 °C. After 96 h of enzymatic saccharification, the determined glucose yields were 184.4 and 141.21 mg g−1 [raw biomass], and xylose yields were 101.6 and 66.5 mg g−1 [raw biomass] for pretreated switchgrass and the mixture of both materials, respectively. Ethanol production potential was estimated to be 166 L tonne−1 [dry switchgrass]. The estimated gross energy in the form of biomethane via anaerobic digestion from the non-pretreated switchgrass was 6774 MJ tonne−1 that was significantly higher than that (3904 MJ tonne−1) of the enzymatically saccharified switchgrass when used to produce ethanol.

Keywords
Anaerobic processes; Biogas; Kinetics; Ethanol; Microalgae; Batch processing
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Biomethane and ethanol production potential of Spirulina platensis algae and enzymatically saccharified switchgrass ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 93, 15 January 2015, Pages 119–127
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
Any Questions? feel free to contact us