Organic Geochemistry of Humic Acids From a Neogene Lignite Sample, Bulgaria

Stefanova, M.; Маринов, Стефан

doi:10.12681/bgsg.11640

Cited by 1 publication

(1 citation statement)

References 17 publications

(21 reference statements)

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“…The LRC samples from the Ekibastuz, Oi-Qaragai, and Karaganda coal basins in Kazakhstan were selected for this study due to their elemental and technical properties, which present interesting opportunities for microbial degradation. Specifically, significant amount of organic compounds in the samples may be beneficial for their better biotransformation 30 , 31 . Activated sludge was chosen as the source of exogenous augmenting microflora due to its robust metabolic potential 32 , abundant microbial community 33 and ability to withstand environmental stress factors 34 .…”

Section: Introductionmentioning

confidence: 99%

Evaluating the low-rank coal degradation efficiency bioaugmented with activated sludge

Kozhakhmetova,

Akimbekov,

Digel

et al. 2024

Sci Rep

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Microbial bioaugmentation of coal is considered as a viable and ecologically sustainable approach for the utilization of low-rank coals (LRC). The search for novel techniques to derive high-value products from LRC is currently of great importance. In response to this demand, endeavors have been undertaken to develop microbially based coal solubilization and degradation techniques. The impact of supplementing activated sludge (AS) as a microbial augmentation to enhance LRC biodegradation was investigated in this study. The LRC and their biodegradation products were characterized using the following methods: excitation-emission Matrices detected fluorophores at specific wavelength positions (O, E, and K peaks), revealing the presence of organic complexes with humic properties. FTIR indicated the increased amount of carboxyl groups in the bioaugmented coals, likely due to aerobic oxidation of peripheral non-aromatic structural components of coal. The bacterial communities of LRC samples are primarily composed of Actinobacteria (up to 36.2%) and Proteobacteria (up to 25.8%), whereas the Firmicutes (63.04%) was the most abundant phylum for AS. The community-level physiological profile analysis showed that the microbial community AS had high metabolic activity of compared to those of coal. Overall, the results demonstrated successful stimulation of LRC transformation through supplementation of exogenous microflora in the form of AS.

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