Abstract
In the early stage, the best conditions for alkali-bound ozone pretreatment were studied. But after treatment, the alkaline black liquor was directly discarded due to the large amount of organic matter, resulting in environmental pollution and waste of resources. In this paper, the alkaline black liquor was recycled under the optimal pretreatment conditions. The results showed that the number of alkaline black liquor cycles had little effect on hemicellulose content, and had a great influence on cellulose content and lignin content. Through structural characterization of corn stover, it was found that the pretreatment caused structural changes of lignin in straw. However, when the alkaline black liquor was recycled for the fourth time, the ether bond in the side chain of lignin and the covalent bond between the components were not sufficiently destroyed, and the damage to the phenolic hydroxyl group was also weakened. It was indicated that when the alkaline black liquor was recycled for the fourth time, the destruction effect of the alkaline black liquor on the straw was significantly inhibited. Therefore, the optimal circulation time of alkaline black liquor was three times, and the cellulolytic conversion rate was 81.53%.
Highlights
The growing demand for energy and fossil fuels has led research into the production of biomass lignocellulose fuels
In order to study the effect of alkaline black liquor recycling on the enzymatic hydrolysis rate and internal structure of corn stover, the alkaline black liquor recycling combined with ozone was used to treat corn stover under optimal pretreatment conditions
It was found that the number of alkaline black liquor cycles had little effect on hemicellulose content, and had a great influence on cellulose content and lignin content
Summary
The growing demand for energy and fossil fuels has led research into the production of biomass lignocellulose fuels. The amount of straw in nature is huge. If it can be converted into biomass energy, it cannot only save fossil energy, protect the environment, and solve the problems caused by agricultural waste and bring considerable economic benefits. The cellulose of the plant cell wall is framed by its highly crystalline ordered structure, and the hemicellulose is linked to the lignin by a covalent bond with phenolic acid. Cellulose and hemicellulose provide further strength of lignin to plant cell walls, hindering the enzymatic hydrolysis of carbohydrates [2]. The biodegradation of lignocellulose requires a combination of hydrolases [4]. There are two main reasons for the incompatibility of lignocellulose to hydrolysis: (1) Cellulase has low accessibility to (micro)crystalline cellulose, which is not conducive to cellulase hydrolysis [5]. (2) The dense and complex structure of cellulose–hemicellulose–lignin prevents the cellulase from approaching cellulose effectively [6,7]
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