Abstract
BackgroundButanol as an important chemical and potential fuel could be produced via ABE fermentation from lignocellulosic biomass. The use of food-related feedstocks such as maize and sugar cane may not be a sustainable solution to world’s energy needs. Recently, Jerusalem artichoke tubers containing inulin have been used as feedstock for butanol production, but this bioprocess is not commercially feasible due to the great value of inulin as functional food. Till now, there is a gap on the utilization of Jerusalem artichoke stalk (JAS) as feedstock for microbial butanol production.ResultsBiobutanol production from JAS was investigated in order to improve cellulose digestibility and efficient biobutanol fermentation. Compared with 9.0 g/L butanol (14.7 g/L ABE) production by 2% NaOH pretreatment of JAS, 11.8 g/L butanol (17.6 g/L ABE) was produced in the best scenario conditions of NaOH–H2O2 pretreatment, washing times and citrate buffer strengths etc. Furthermore, more than >64% water in washing pretreated JAS process could be saved, with improving butanol production by >25.0%. To mimic in situ product recovery for ABE fermentation, the vapor stripping–vapor permeation (VSVP) process steadily produced 323.4–348.7 g/L butanol (542.7–594.0 g/L ABE) in condensate, which showed more potentials than pervaporation for butanol recovery.ConclusionsTherefore, the present study demonstrated an effective strategy on efficient biobutanol production using lignocellulosic biomass. The process optimization could contribute to significant reduction of wastewater emission and the improvement of lignocellulosic biomass digestibility and biobutanol production, which makes biobutanol production more efficient using JAS.
Highlights
Butanol as an important chemical and potential fuel could be produced via acetone–butanol– ethanol (ABE) fermentation from lignocellulosic biomass
The composition of raw Jerusalem artichoke stalk (JAS) used in this work contained 47.1% cellulose, 16.2% hemicellulose, and 24.2% lignin
When H2O2 supplementation was in the range from 0 to 6%, cellulose content in pretreated solid JAS increased from 55.1 to 64.0%, and there was no increase of cellulose with more H2O2 supplementation (9%)
Summary
Butanol as an important chemical and potential fuel could be produced via ABE fermentation from lignocellulosic biomass. There is a gap on the utilization of Jerusalem artichoke stalk (JAS) as feedstock for microbial butanol production. Butanol as an important chemical and potential fuel could be produced via ABE fermentation using maize, sugar cane, etc., but the use of these. Jerusalem artichoke (JA) is a perennial crop of the Composite family, which can be planted in marginal lands without competing for arable land with grain crops [5, 6] It is a dedicated energy crop, which can tolerate various environmental stresses such as drought, salt, pest invasion, and infection of plant diseases. There is a gap on the utilization of JAS as feedstock for microbial butanol production
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