THERMO-PRETREATMENT ON BAMBOO BIOMASS WITH AMMONIA

Hydrogen is rising as one of potential fuel types to instead of petroleum and fossil energy in the future because of its high energy density and non-carbon exhaust. There are many processes for hydrogen production, but fermentative hydrogen production (FHP) from lignocellulosic biomass as rich-carbohydrate feedstocks is considered to be the one of the most effective methods. However, the yield of fermentable sugar could be strongly impacted by pretreatment of lignocellulosic materials.Thus, this work studied the effects of thermal-ammonia pretreatment method on bamboo powder at 125 oC, during in 30-90 minutes. The results showed that the maximum recovery of carbohydrate in solid were 554.21 mg/(1g bamboo powder), and the sugar conversion yield and sugar content in final solution were 9.07 % and 8.31 g/L, respectively. 94.2 % of lignin content in bamboo biomass could be removed. The maximum hydrogen accumulation reached 5.7 % of the gaseous mixtures after 48 h of fermentation. This study showed that hydrothermal technique could be an efficient way in order to disrupt the lignin structure of the biomass and increase the accessibility of other treatment agents to cellulose and hemicellulose.

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Fermentative Conversion of Two-Step Pre-Treated Lignocellulosic Biomass to Hydrogen

Catalysts ◽

10.3390/catal9100858 ◽

2019 ◽

Vol 9 (10) ◽

pp. 858 ◽

Cited By ~ 3

Author(s):

Karolina Kucharska ◽

Hubert Cieśliński ◽

Piotr Rybarczyk ◽

Edyta Słupek ◽

Rafał Łukajtis ◽

...

Keyword(s):

Hydrogen Production ◽

Lignocellulosic Biomass ◽

Lignin Content ◽

Dark Fermentation ◽

Biomass Composition ◽

Total Phenolic ◽

High Hydrogen ◽

Fermentative Hydrogen Production ◽

Pre Treatment ◽

Fermentative Hydrogen

Fermentative hydrogen production via dark fermentation with the application of lignocellulosic biomass requires a multistep pre-treatment procedure, due to the complexed structure of the raw material. Hence, the comparison of the hydrogen productivity potential of different lignocellulosic materials (LCMs) in relation to the lignocellulosic biomass composition is often considered as an interesting field of research. In this study, several types of biomass, representing woods, cereals and grass were processed by means of mechanical pre-treatment and alkaline and enzymatic hydrolysis. Hydrolysates were used in fermentative hydrogen production via dark fermentation process with Enterobacter aerogenes (model organism). The differences in the hydrogen productivity regarding different materials hydrolysates were analyzed using chemometric methods with respect to a wide dataset collected throughout this study. Hydrogen formation, as expected, was positively correlated with glucose concentration and total reducing sugars amount (YTRS) in enzymatic hydrolysates of LCMs, and negatively correlated with concentrations of enzymatic inhibitors i.e., HMF, furfural and total phenolic compounds in alkaline-hydrolysates LCMs, respectively. Interestingly, high hydrogen productivity was positively correlated with lignin content in raw LCMs and smaller mass loss of LCM after pre-treatment step. Besides results of chemometric analysis, the presented data analysis seems to confirm that the structure and chemical composition of lignin and hemicellulose present in the lignocellulosic material is more important to design the process of its bioconversion than the proportion between the cellulose, hemicellulose and lignin content in this material. For analyzed LCMs we found remarkable higher potential of hydrogen production via bioconversion process of woods i.e., beech (24.01 mL H2/g biomass), energetic poplar (23.41 mL H2/g biomass) or energetic willow (25.44 mL H2/g biomass) than for cereals i.e., triticale (17.82 mL H2/g biomass) and corn (14.37 mL H2/g biomass) or for meadow grass (7.22 mL H2/g biomass).

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