Biodesulphurized subbituminous coal by different fungi and bacteria studied by reductive pyrolysis. Part 1: Initial coal

Evaluation of microwave treatment on coal structure and sulfur species by reductive pyrolysis-mass spectrometry method

“…The difference between measured sulfur content before and after pyrolysis is calculated and can be assigned as the sulfur amount detected by MS as H 2 S. In this way, the efficiency and yield of the reduction/hydrogenation of all sulfur compounds into H 2 S during the AP-TPR experiment can be calculated and correlated with the area under the total H 2 S signal and thus under each H 2 S peak, making an almost quantitative sulfur compound assignment possible. It is found that the amount of other volatile sulfur compounds than H 2 S detected by the MS or by the GC/MS "off-line" variant only accounts for 1 up to 2% of the total volatile sulfur compounds released during an AP-TPR experiment [26], supporting the above formulated quantitative sulfur amount assignments. The sulfur left in the residue is to be considered as complex thiophenic sulfur structures (original present or formed (minor amounts)) and not hydrogenatedunder these AP-TPR conditions.…”

“…This above conclusion are based on model compound studies [26] and also on AP-TPR/MS profiles of typical aliphatic and aromatic CHfragments, as is shown in Fig. 2A and B for the initial coal.…”

“…To investigate the changes and presence of different organic sulfur functionalities in coal in more detail atmospheric pressure-temperature programmed-reduction (AP-TPR) method is applied [26][27][28].…”

Biodegradation of dibenzothiophene and its application in the production of clean coal

“…Three distinct fungal strains, Trametes versicolor, Phanerochaeta chrysosporium and Pleurotus Sajor-Caju have been used to treat subbituminous coal high in sulphur from the Pirin Basin of Bulgaria. Results of the study revealed that around 79% of inorganic sulphur was removed using a mixed bacterial culture, whereas, the fungal strains, T. versicolor and P. chrysosporium could further reduce the organic sulphur present in the coal sample by 13% [78]. In one of the studies, under optimum conditions, laccase enzyme derived from T. versicolor ATCC 200801 could reduce the total sulphur content of Turkish lignites by 29%, out of Table 3 Fungal and yeasts strains repoted in biodesulphurization.…”

Recent advances in beneficiation for low rank coals

“…Furthermore, smaller particle sizes could increase the desulfurization rates [154]. Gonsalvesh et al [155] found that about 79% of inorganic sulfur could be removed by Phanerochaeta chrysosporium and about 13% of organic sulfur was removed by Trametes versicolor, with mixed culture of bacteria. It is noted that very long time is required to obtain an effective biodesulfurization of low rank coal using fungus or bacterium.…”