Bioconversion and quantification of humic substances from low rank coals using indigenous fungal isolates

Rehman, Muhammad Zia ur; Akhtar, Kalsoom; Khan, Ali Nisar; Tahir, Muhammad; Khaliq, Shazia; Akhtar, Nasrin; Ragauskas, Arthur J.

doi:10.1016/j.jclepro.2022.134102

Cited by 10 publications

(1 citation statement)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3a illustrates that the initial pH of the PDA liquid medium is weakly acidic, and the pH of the liquefaction system of the microbial group continues to increase during the first 12 d, peaking at 8.24 on 12 d and then decreasing gradually. This is consistent with the results of previous studies [20], that have demonstrated fungi's ability to dissolve lignite employing auto-secreted alkaline products [12,21]. Hence, we presumed that the increase in pH of the liquefaction system was attributed to the extracellular alkaline substances secreted by M-3.…”

Section: Analysis Of Ph Orp Ec and Total Hg Content During Bioleachin...supporting

confidence: 93%

Bioleaching Mercury from Coal with Aspergillus flavus M-3

Mao,

Mei,

et al. 2023

Microorganisms

View full text Add to dashboard Cite

This study focuses on the utilization of Aspergillus flavus(M-3) for the bioleaching mercury from coal, offering an alternative and environmentally to its clean utilization. The fungus was isolated from the soil near a high mercury coal mine in Lao Ying Shan (LYS), Guizhou. Utilizing direct mercury analysis, X-ray diffraction (XRD), and Fourier Transform-Infrared (FT-IR) analysis techniques, the transformation of mercury speciation, mineral components, and organic groups in the coal were analyzed before and after the bioleaching process. The findings of the study illustrated that the fungus M-3 exhibited a remarkable capacity for coal bioliquefaction and mercury leaching from LYS coal. Following a 15-day bioleaching process, a remarkable mercury leaching rate of 83.79% was achieved. Various forms of mercury speciation, including residue, organic matter, sulfide-bound, oxide-bound, exchangeable, and carbonate-bound forms, were released from the coal, with leaching rates ranging from 80.41% to 92.60%. XRD analysis indicated that the M-3 strain facilitated the dissolution of coal pyrite and the degradation of macromolecules, effectively loosening the coal structure. FT-IR analysis of raw and residual coal demonstrated the breakdown of the aromatic ring structure and introduced oxygen-containing functional groups by M-3. Overall, this study highlights the efficacy of bioliquefying coal using Aspergillus flavus (M-3) as a method for clean coal utilization while simultaneously bioleaching mercury.

show abstract

Section: Analysis Of Ph Orp Ec and Total Hg Content During Bioleachin...supporting

confidence: 93%