Liquid Hot Water Pretreatment for Lignocellulosic Biomass Biorefinery

In this work, liquid hot water pretreatment (autohydrolysis) was used to improve enzymatic hydrolysis of a commonly consumed vegetable waste in Spain, Italian green pepper, to finally produce fermentable sugars. Firstly, the effect of temperature and contact time on sugar recovery during pretreatment (in insoluble solid and liquid fraction) was studied in detail. Then, enzymatic hydrolysis using commercial cellulase was performed with the insoluble solid resulting from pretreatment. The objective was to compare results with and without pretreatment. The results showed that the pretreatment step was effective to facilitate the sugars release in enzymatic hydrolysis, increasing the global sugar yield. This was especially notable when pretreatment was carried out at 180 °C for 40 min for glucose yields. In these conditions a global glucose yield of 61.02% was obtained. In addition, very low concentrations of phenolic compounds (ranging from 69.12 to 82.24 mg/L) were found in the liquid fraction from enzymatic hydrolysis, decreasing the possibility of fermentation inhibition produced by these components. Results showed that Italian green pepper is an interesting feedstock to obtain free sugars and prevent the enormous quantity of this food waste discarded annually.

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Optimizing Liquid Hot Water pretreatment conditions to enhance sugar recovery from wheat straw for fuel-ethanol production

Fuel ◽

10.1016/j.fuel.2008.06.009 ◽

2008 ◽

Vol 87 (17-18) ◽

pp. 3640-3647 ◽

Cited By ~ 163

Author(s):

J.A. Pérez ◽

I. Ballesteros ◽

M. Ballesteros ◽

F. Sáez ◽

M.J. Negro ◽

...

Keyword(s):

Ethanol Production ◽

Wheat Straw ◽

Fuel Ethanol ◽

Hot Water ◽

Sugar Recovery ◽

Liquid Hot Water Pretreatment ◽

Liquid Hot Water ◽

Water Pretreatment ◽

Pretreatment Conditions ◽

Hot Water Pretreatment

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Liquid hot water pretreatment to enhance the anaerobic digestion of wheat straw—effects of temperature and retention time

Environmental Science and Pollution Research ◽

10.1007/s11356-019-06111-z ◽

2019 ◽

Vol 26 (28) ◽

pp. 29424-29434 ◽

Cited By ~ 8

Author(s):

Gaoyuan Shang ◽

Congguang Zhang ◽

Fei Wang ◽

Ling Qiu ◽

Xiaohui Guo ◽

...

Keyword(s):

Anaerobic Digestion ◽

Wheat Straw ◽

Retention Time ◽

Hot Water ◽

Liquid Hot Water Pretreatment ◽

Liquid Hot Water ◽

Water Pretreatment ◽

Effects Of Temperature ◽

Hot Water Pretreatment

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Does Acid Addition Improve Liquid Hot Water Pretreatment of Lignocellulosic Biomass towards Biohydrogen and Biogas Production?

Sustainability ◽

10.3390/su12218935 ◽

2020 ◽

Vol 12 (21) ◽

pp. 8935 ◽

Cited By ~ 1

Author(s):

George Dimitrellos ◽

Gerasimos Lyberatos ◽

Georgia Antonopoulou

Keyword(s):

Lignocellulosic Biomass ◽

Biogas Production ◽

Hot Water ◽

Liquid Hot Water ◽

Acid Addition ◽

Water Pretreatment ◽

Inhibitory Compounds ◽

Production Of Hydrogen ◽

Potential Inhibitors ◽

Hot Water Pretreatment

The effect of liquid hot water (LHW) pretreatment with or without acid addition (A-LHW) on the production of hydrogen—through dark fermentation (DF)—and methane—through anaerobic digestion (AD)—using three different lignocellulosic biomass types (sunflower straw (SS), grass lawn (GL), and poplar sawdust (PS)) was investigated. Both pretreatment methods led to hemicellulose degradation, but A-LHW resulted in the release of more potential inhibitors (furans and acids) than the LHW pretreatment. Biological hydrogen production (BHP) of the cellulose-rich solid fractions obtained after LHW and A-LHW pretreatment was enhanced compared to the untreated substrates. Due to the release of inhibitory compounds, LHW pretreatment led to higher biochemical methane potential (BMP) than A-LHW pretreatment when both separated fractions (liquid and solid) obtained after pretreatments were used for AD. The recovered energy in the form of methane with LHW pretreatment was 8.4, 12.5, and 7.5 MJ/kg total solids (TS) for SS, GL, and PS, respectively.

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