Comparison of sodium hydroxide and calcium hydroxide pretreatments of giant reed for enhanced enzymatic digestibility and methane production

•Sodium hydroxide and calcium hydroxide pretreatments of giant reed were compared.•Revenue from sodium hydroxide (NaOH) pretreatment can’t offset the chemical input.•Calcium hydroxide (Ca(OH)2) pretreatment improved glucose yield and methane yield.•Pretreatment with 7% Ca(OH)2 had a positive net ben...

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Bibliographic Details
Published in:Bioresource technology 2017-11, Vol.244 (Pt 1), p.1150-1157
Main Authors: Jiang, Danping, Ge, Xumeng, Zhang, Quanguo, Zhou, Xuehua, Chen, Zhou, Keener, Harold, Li, Yebo
Format: Article
Language:English
Subjects:
Alkaline pretreatment
Benefit-cost analysis
Biofuels
Biogas production
Biomass
Calcium Hydroxide
Energy crop
Enzymatic digestibility
Methane
Sodium Hydroxide
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Summary:•Sodium hydroxide and calcium hydroxide pretreatments of giant reed were compared.•Revenue from sodium hydroxide (NaOH) pretreatment can’t offset the chemical input.•Calcium hydroxide (Ca(OH)2) pretreatment improved glucose yield and methane yield.•Pretreatment with 7% Ca(OH)2 had a positive net benefit of $5.8/tonne dry biomass.•Ca(OH)2 is more feasible than NaOH for improving biogas production from giant reed. NaOH pretreatment with leachate reuse and Ca(OH)2 pretreatment were compared for improved enzymatic digestibility and biogas production from giant reed, a promising energy crop. The NaOH pretreatment with leachate reuse increased glucose yields during enzymatic hydrolysis by 2.6-fold, and methane yields during anaerobic digestion by 1.4- to 1.6-fold. However, NaOH pretreatment had a negative net benefit (i.e., revenue from increased energy production minus chemical cost). Pretreatment with 7–20% Ca(OH)2 not only improved glucose yield and methane yield by up to 2.3-fold and 1.4-fold, respectively, but also obtained a net benefit of $1.1–5.8/tonne dry biomass. Thus, Ca(OH)2 pretreatment was shown to be more feasible than NaOH pretreatment for biogas production from giant reed.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.08.067