Lignite biosolubilization and bioconversion by Bacillus sp.: the collation of analytical data

  • The vast metabolic potential of microbes in brown coal (lignite) processing and utilization can greatly contribute to innovative approaches to sustainable production of high-value products from coal. In this study, the multi-faceted and complex coal biosolubilization process by Bacillus sp. RKB 7 isolate from the Kazakhstan coal-mining soil is reported, and the derived products are characterized. Lignite solubilization tests performed for surface and suspension cultures testify to the formation of numerous soluble lignite-derived substances. Almost 24% of crude lignite (5% w/v) was solubilized within 14 days under slightly alkaline conditions (pH 8.2). FTIR analysis revealed various functional groups in the obtained biosolubilization products. Analyses of the lignite-derived humic products by UV-Vis and fluorescence spectrometry as well as elemental analysis yielded compatible results indicating the emerging products had a lower molecular weight and degree of aromaticity. Furthermore, XRD and SEM analyses were used to evaluate the biosolubilization processes from mineralogical and microscopic points of view. The findings not only contribute to a deeper understanding of microbe–mineral interactions in coal environments, but also contribute to knowledge of coal biosolubilization and bioconversion with regard to sustainable production of humic substances. The detailed and comprehensive analyses demonstrate the huge biotechnological potential of Bacillus sp. for agricultural productivity and environmental health.

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Author:Nuraly S. AkimbekovORCiD, Ilya DigelORCiD, Gulzhamal Abdieva, Perizat Ualieva, Kuanysh Tastambek
DOI:https://doi.org/10.1080/17597269.2020.1753936
ISSN:1759-7277
Parent Title (English):Biofuels
Publisher:Taylor & Francis
Place of publication:London
Document Type:Article
Language:English
Year of Completion:2021
Tag:Bacillus sp; Biosolubilization; humic acid; lignite
Volume:12
Issue:3
First Page:247
Last Page:258
Link:https://doi.org/10.1080/17597269.2020.1753936
Zugriffsart:bezahl
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
FH Aachen / IfB - Institut für Bioengineering
collections:Verlag / Taylor & Francis