Biotrickling filters for hydrogen sulphide, methyl mercaptan, dimethyl sulphide and dimethyl disulphide removal by Thiobacillus thioparus and Acidithiobacillus thiooxidans

The photolytic oxidation of methyl mercaptan, dimethyl sulphide, and dimethyl disulphide was studied in a batch photolysis apparatus. Short wavelength ultraviolet light was provided by a deuterium discharge lamp and monitored by a monochromator equipped with an extended response photomultiplyer tube. Sulphide concentrations were determined using a gas chromatograph equipped with a flame photometric detector having a sulphur response at 365 nm.The rate of photo-oxidation of methyl mercaptan was found to be a linear function of the photon absorption rate and exhibited a quantum yield of 12. The methyl mercaptan photo-oxidation rate was found to be unaffected by increased oxygen concentration, decreased atmospheric pressure, or the presence of sulphur dioxide.The quantum yield of dimethyl sulphide photo-oxidation was found to be dependent upon air pressure; the quantum yield of 4 at 1 atm pressure increased to 8 at 1/4 atm.The quantum yield of dimethyl disulphide photo-oxidation in air was found to be 1.9 at atmospheric pressure and a disulphide concentration of 7.04 × 10−5M.

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THE THERMAL DECOMPOSITION OF DIMETHYL DISULPHIDE

Canadian Journal of Chemistry ◽

10.1139/v54-097 ◽

1954 ◽

Vol 32 (8) ◽

pp. 768-779 ◽

Cited By ~ 20

Author(s):

John A. R. Coope ◽

W. A. Bryce

Keyword(s):

Thermal Decomposition ◽

Hydrogen Sulphide ◽

Carbon Disulphide ◽

Main Reaction ◽

Methyl Mercaptan ◽

Primary Reaction ◽

Gaseous State ◽

Dimethyl Disulphide ◽

Volatile Products ◽

Free Sulphur

The thermal decomposition of dimethyl disulphide has been studied in the gaseous state by a static method. The primary reaction, which follows a reproducible induction period, produces one mole of methyl mercaptan per mole of disulphide, together with a product of low volatility believed to be a thioformaldehyde polymer:[Formula: see text]There is also a competing reaction producing a large quantity of hydrogen sulphide. The remaining volatile products, hydrocarbons of two or more carbon atoms (believed to be chiefly ethylene), free sulphur, polysulphides, and carbon disulphide are formed either by the latter reaction or by the extensive decomposition of products. The decomposition is catalyzed by hydrogen sulphide, and more strongly by the complete reaction mixture. A mechanism is proposed for the main reaction.

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Coupled cluster investigation on the thermochemistry of dimethyl sulphide, dimethyl disulphide and their dissociation products: the problem of the enthalpy of formation of atomic sulphur

Molecular Physics ◽

10.1080/00268976.2013.837536 ◽

2013 ◽

Vol 112 (8) ◽

pp. 1167-1173 ◽

Cited By ~ 1

Author(s):

Pablo A. Denis

Keyword(s):

Enthalpy Of Formation ◽

Coupled Cluster ◽

Dimethyl Sulphide ◽

Dimethyl Disulphide ◽

The Enthalpy Of Formation

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Mechanism of Oxidation of Dimethyl Disulphide by Thiobacillus thioparus Strain E6

Microbiology ◽

10.1099/00221287-134-11-3031 ◽

1988 ◽

Vol 134 (11) ◽

pp. 3031-3039 ◽

Cited By ~ 6

Author(s):

N. A. Smith ◽

D. P. Kelly

Keyword(s):

Thiobacillus Thioparus ◽

Dimethyl Disulphide ◽

Mechanism Of Oxidation

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Removal of Dimethyl Sulphide from Off-Gas Mixtures Containing Hydrogen Sulphide and Methanethiol by a Biotrickling Filter

Environmental Technology ◽

10.1080/09593330.2000.9619004 ◽

2000 ◽

Vol 21 (10) ◽

pp. 1173-1180 ◽

Cited By ~ 13

Author(s):

A. Ruokojärvi ◽

M. Aatamila ◽

T. Hartikainen ◽

M. Olkkonen ◽

J. Salmi ◽

...

Keyword(s):

Hydrogen Sulphide ◽

Gas Mixtures ◽

Biotrickling Filter ◽

Dimethyl Sulphide

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Changes in Concentration of Volatile Sulphur Compounds of Mouth Air during the Menstrual Cycle

Journal of International Medical Research ◽

10.1177/030006057800600313 ◽

1978 ◽

Vol 6 (3) ◽

pp. 245-254 ◽

Cited By ~ 37

Author(s):

Joseph Tonzetich ◽

George Preti ◽

George R Huggins

Keyword(s):

Menstrual Cycle ◽

Hydrogen Sulphide ◽

Maximum Level ◽

Methyl Mercaptan ◽

Physiological Changes ◽

Sulphur Compounds ◽

Volatile Sulphur Compounds ◽

Vaginal Secretions ◽

Cyclic Variations ◽

Cyclic Changes

Five female subjects were studied to determine the applicability of volatile sulphur analysis of mouth air to monitor chemical, cytological and physiological changes observed during the menstrual cycle. Volatile sulphur results were compiled over twelve ovulatory cycles derived from two or three consecutive cycles from each subject. The results of mouth air evaluations were compared with concurrently determined levels of hormones in blood serum and organic metabolites in vaginal secretions. Distinct cyclic variations were observed in concentrations of all three volatile sulphur components (hydrogen sulphide, methyl mercaptan and dimethyl sulphide) of mouth air. There was a definite overall trend for the compounds to increase two- to four-fold immediately around mid-cycle and menstruation as well as during mid-proliferative and mid-luteal phases of each menstrual cycle. In those cycles in which hormonal profiles were obtained, the increase in volatile sulphur content closely coincided with the mid-cycle surge in luteinizing hormone, while the peak during the mid-luteal phase corresponded to a period of maximum level of progesterone and elevated oestrogens. The concentrations of lactic acid and urea in vaginal secretions also underwent cyclic changes analogous to those described for volatile sulphur components of mouth air. The occurrence of malodourous concentrations of hydrogen sulphide and methyl mercaptan immediately around menses in most of the cycles studied satisfactorily accounts for the reported incidence of breath malodour observed during this time.

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