Evaluating the low-rank coal degradation efficiency bioaugmented with activated sludge
Kozhakhmetova M. Akimbekov N. Digel I. Tastambek K.
December 2024Nature Research
Scientific Reports
2024#14Issue 1
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.
Activated sludge , Biodegradation , Humic-like compounds , Low-rank coal , Microbial community
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Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Khoja Akhmet Yassawi International Kazakh-Turkish University, Turkestan, 161200, Kazakhstan
West Kazakhstan Marat Ospanov Medical University, Maresyev Str. 68, Aktobe, 030019, Kazakhstan
Aachen University of Applied Sciences, Heinrich-Mussmann-Straße 1, Jülich, 52428, Germany
M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
Al-Farabi Kazakh National University
Khoja Akhmet Yassawi International Kazakh-Turkish University
West Kazakhstan Marat Ospanov Medical University
Aachen University of Applied Sciences
M. Auezov South Kazakhstan University
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