| Autor: |
Wu, Li, Li, Huaizhen, Cao, Bin, Zhao, Tongqian, Wang, Zuheng |
| Zdroj: |
Arabian Journal of Geosciences; Feb2021, Vol. 14 Issue 4, p1-10, 10p |
| Abstrakt: |
In order to improve the utilization efficiency of coal by microorganisms and increase gas production, ultrasound assisted hydrogen peroxide oxidation of lignite was studied. The changes of accumulated gas, methane content, carbon dioxide content, and fluorescence characteristics of intermediate products in lignite and oxidized lignite system were studied by drainage gas gathering method, gas chromatography (GC) and fluorescence spectrophotometer. It was found that the cumulative gas could be divided into three stages: rapid gas production, slow gas production, and basic stable stage. The methane production rate of raw coal and lignite treated by ultrasound assisted hydrogen peroxide reached 987.23 μmol/g and 1290.22 μmol/g, respectively. The methane yield for oxidized lignite was 30.69% higher than that of raw lignite. The ultrasonic-assisted hydrogen peroxide pretreatment for lignite could effectively increase methane production. The analysis results of the fluorescence characteristics of the intermediates indicated that the total fluorescence intensity (FI) integral of intermediates decreased with the increase of time. The fluorescence peak positions mainly changed in tyrosine aromatic proteins and soluble microbial metabolites. Ultrasound-assisted hydrogen peroxide pretreatment lignite changed the amount of tyrosine-based aromatic proteins, hydrophobic organic acid fulvic acid, humic acids, and soluble microbial metabolites in the slow and stable stages of lignite biogas. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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