scholarly journals Study of Coal Microbiocenosis for Development of Biotechnological Method for its Desulfurization

2021 ◽  
Vol 15 (1) ◽  
pp. 74-80
Author(s):  
Iryna Blayda ◽  
◽  
Tetyana Vasylieva ◽  
Nataliia Vasylieva ◽  
Valentyna Khytrych ◽  
...  
Keyword(s):  
Heterotrophic Bacteria ◽  
Sulfur Removal ◽  
Organic Sulfur ◽  
Full Potential ◽  
Microscopic Fungi ◽  
Silicate Bacteria ◽  
Bacillus Genus

A presence of microscopic fungi, heterotrophic bacteria, as well as neutrophilic and acidophilic chemolitotrophic bacteria was determined in coal microbiocenosis. The largest and most active towards pyrite sulfur removal is the Acidithiobacillus genus. Heterotrophic bacteria have the biggest potential when it comes to removal of organic sulfur. Preceding treatment of coal with “silicate” bacteria from the Bacillus genus will allow to use coal microbiocenosis for its biodesulfurisation at its full potential.

scholarly journals Bacterial Community Structure Associated with a Dimethylsulfoniopropionate-Producing North Atlantic Algal Bloom

2000 ◽  
Vol 66 (10) ◽  
pp. 4237-4246 ◽  
Author(s):  
José M. González ◽  
Rafel Simó ◽  
Ramon Massana ◽  
Joseph S. Covert ◽  
Emilio O. Casamayor ◽  
...  
Keyword(s):  
Bacterial Community ◽  
16S Rrna ◽  
North Atlantic ◽  
Surface Waters ◽  
Algal Blooms ◽  
Algal Bloom ◽  
Heterotrophic Bacteria ◽  
Algal Species ◽  
Organic Sulfur ◽  
Polymorphism Analysis

ABSTRACT The bacteria associated with oceanic algal blooms are acknowledged to play important roles in carbon, nitrogen, and sulfur cycling, yet little information is available on their identities or phylogenetic affiliations. Three culture-independent methods were used to characterize bacteria from a dimethylsulfoniopropionate (DMSP)-producing algal bloom in the North Atlantic. Group-specific 16S rRNA-targeted oligonucleotides, 16S ribosomal DNA (rDNA) clone libraries, and terminal restriction fragment length polymorphism analysis all indicated that the marine Roseobacter lineage was numerically important in the heterotrophic bacterial community, averaging >20% of the 16S rDNA sampled. Two other groups of heterotrophic bacteria, the SAR86 and SAR11 clades, were also shown by the three 16S rRNA-based methods to be abundant in the bloom community. In surface waters, the Roseobacter, SAR86, and SAR11 lineages together accounted for over 50% of the bacterial rDNA and showed little spatial variability in abundance despite variations in the dominant algal species. Depth profiles indicated thatRoseobacter phylotype abundance decreased with depth and was positively correlated with chlorophyll a, DMSP, and total organic sulfur (dimethyl sulfide plus DMSP plus dimethyl sulfoxide) concentrations. Based on these data and previous physiological studies of cultured Roseobacter strains, we hypothesize that this lineage plays a role in cycling organic sulfur compounds produced within the bloom. Three other abundant bacterial phylotypes (representing a cyanobacterium and two members of the α Proteobacteria) were primarily associated with chlorophyll-rich surface waters of the bloom (0 to 50 m), while two others (representing Cytophagales and δProteobacteria) were primarily found in deeper waters (200 to 500 m).

Microwave Applied in Coal Desulfurization Process

2011 ◽  
Vol 71-78 ◽  
pp. 2122-2126 ◽  
Author(s):  
Jie Mi ◽  
Rui Di Wei
Keyword(s):  
Microwave Irradiation ◽  
Irradiation Time ◽  
Sulfur Removal ◽  
Organic Sulfur ◽  
Xps Analysis ◽  
Peroxyacetic Acid ◽  
Inorganic Sulfur ◽  
Coal Desulfurization ◽  
Desulfurization Process ◽  
Sulfur In Coal

In this paper, the desulfurization of Fangshan coal was carried out by tetrachloroethylene extraction under ultrasonic and microwave irradiation. The GC-MS analysis of the tetrachloroethylene extraction reveals that organic sulfur in coal can be removed by tetrachloroethylene extract under ultrasonic and microwave irradiation. It is found that microwave irradiation time has great effect on organic sulfur removal. With the microwave irradiation time increases, the efficiency of organic sulfur removal increases. The desulphurization yield reaches maximum, 45%, when the time is 30 minutes or more. It can be clearly seen that Fangshan coal was oxidated by peroxyacetic acid under ultrasonic and microwave irradiation. From the XPS analysis of the macerals of the coal, most of the inorganic sulfur and organic sulfur are removed, especially thioether and thioalcohol which can be completely removed. These results suggest that microwave is an effective way to remove sulfur in coal.

Organic sulfur removal from coal by electrolysis in alkaline media

1988 ◽  
Vol 18 (1) ◽  
pp. 25-36 ◽  
Author(s):  
P.G. Wapner ◽  
S.B. Lalvani ◽  
G. Awad
Keyword(s):  
Sulfur Removal ◽  
Alkaline Media ◽  
Organic Sulfur

Bioleaching of a Rich-In-Carbonates Copper Ore at Alkaline pH

2007 ◽  
Vol 20-21 ◽  
pp. 103-106 ◽  
Author(s):  
V.I. Groudeva ◽  
K. Krumova ◽  
Stoyan N. Groudev
Keyword(s):  
Heterotrophic Bacteria ◽  
Alkaline Ph ◽  
Copper Ore ◽  
Neutralization Potential ◽  
Thiobacillus Thioparus ◽  
Sulphide Minerals ◽  
Chemolithotrophic Bacteria ◽  
Silicate Bacteria ◽  
Ph Conditions ◽  
Net Neutralization Potential

A rich-in- carbonates copper ore was subjected to bioleaching under alkaline pH conditions by means of different microorganisms or their metabolites. The ore contained 1.40% copper, 1.94% sulphur, 3.25% iron and 20.3% carbonates, and had a pH of 8.6 and a highly positive net neutralization potential (325 kg CaCO3/t). Copper was present mainly as different sulphide minerals (bornite, covellite, chalcopyrite). The leaching was carried out by means of the shake-flask technique at 32 oC using finely ground (minus 100 μm) ore. The following microorganisms were used to leach the sample: ammonifying bacteria (related to the genera Bacillus, Acinetocater and Vibrio); heterotrophic bacteria (Acetobacter and Pseudomonas) and fungi (Asperillus niger and Penicillium chrysogenum) producing citric acid; heterotrophic bacteria (Micrococcus, Alcaligenes and Bacillus) producing amino acids (mainly alanine); basophilic chemolithotrophic bacteria (Thiobacillus thioparus, Hallothiobacillus neapolitanus, Starkeya novella; ”silicate bacteria” (Bacillus circulans) producing organic acids and exopolysaccharides; bacteria possessing urease enzymatic activity (Corynebacterium). The best results were achieved by means of a mixed culture of urease-possessing bacteria, which under certain conditions was able to solubilize 64.4% of the copper within 30 days of leaching.

EFFECT OF PYRITIC SULFUR AND MINERAL HATTER ON ORGANIC SULFUR REMOVAL FROM COAL

1993 ◽  
Vol 11 (7) ◽  
pp. 923-936 ◽  
Author(s):  
Padmakar Vishnubhatt ◽  
Theodore Thome ◽  
Sunggyu Lee#
Keyword(s):  
Sulfur Removal ◽  
Organic Sulfur ◽  
Pyritic Sulfur
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