Decrease in hydrogen sulfide content during the final stage of beer fermentation due to involvement of yeast and not carbon dioxide gas purging

2008 ◽  
Vol 106 (3) ◽  
pp. 253-257 ◽  
Author(s):  
Kaneo Oka ◽  
Teruhiko Hayashi ◽  
Nobuya Matsumoto ◽  
Hideshi Yanase
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulfide ◽  
Final Stage ◽  
Beer Fermentation ◽  
Carbon Dioxide Gas ◽  
Gas Purging ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

Hydrogen sulfide content in pregnant women with preeclampsia in late gestation and their newborns

2021 ◽  
Vol 66 (7) ◽  
pp. 396-400
Author(s):  
Irina Gennadievna Popova ◽  
O. G. Sitnikova ◽  
S. B. Nazarov ◽  
R. I. Sadov ◽  
I. A. Panova ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Late Gestation ◽  
Control Group ◽  
Uncomplicated Pregnancy ◽  
Hypertensive Disorders ◽  
Sulfide Content ◽  
Postnatal Adaptation ◽  
Group 2 ◽  
Hydrogen Sulfide Content ◽  
Group 1

We examined 70 women who were 22-40 weeks pregnant and their newborns. Of these, 15 women with moderate PE made up group 1, 22 women with severe PE-group 2, and 55 women with uncomplicated pregnancy without hypertensive disorders - the control group. Blood was collected from women when they were admitted to the clinic, and blood was taken from newborns for 3-5 days of life. The concentration of hydrogen sulfide was determined by the method of K. Qu et al [17]. There was a decrease in the level of hydrogen sulfide in the blood serum of women whose pregnancy was complicated by severe preeclampsia. In newborns born to mothers with preeclampsia, an increase in the concentration of hydrogen sulfide was detected in the blood, which is probably a compensatory reaction aimed at restoring vascular homeostasis during early postnatal adaptation.

The Research on Influence Factors and Control of Hydrogen Sulfide during Steam Drive

2014 ◽  
Vol 962-965 ◽  
pp. 736-740
Author(s):  
Feng Yan
Keyword(s):  
Hydrogen Sulfide ◽  
Experimental Studies ◽  
Influence Factors ◽  
Chemical Agent ◽  
Content Increase ◽  
Prevention Measures ◽  
Steam Drive ◽  
Rate Of Increase ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

This project carries out the research on influence factors of wells producing hydrogen sulfide in connection with the actual situation of producing hydrogen sulfide in Qi-40 steam drive process. Experimental studies have shown that: A. temperature is the main external factors of produce hydrogen sulfide, It will produce hydrogen sulfide when temperature is above 100°C, hydrogen sulfide content increase about 300ppm in average when the temperature increase per 20°C; hydrogen sulfide content will be in the greatest increase when temperature at the range of 160°C~180°C; the rate of increase in the levels of hydrogen sulfide will significantly reduce when temperature above 180 °C.B. Adding Chemical agent with surface activity can inhibit the release of hydrogen sulfide. C. Adding acid chemical agent will make the content of hydrogen sulfide increase. The experimental study also investigated hydrogen sulfide prevention measures.

scholarly journals Long-term immunity alterations in the employees of the high hydrogen sulfide content gas condensate processing facility

2021 ◽  
Author(s):  
OV Boiko ◽  
YuI Dotsenko
Keyword(s):  
Hydrogen Sulfide ◽  
Immune System ◽  
Immune Status ◽  
Phagocytic Index ◽  
High Hydrogen ◽  
Gas Processing ◽  
Processing Facility ◽  
Condensate Processing ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

The current measures for protection of the gas processing plant employees cannot fully prevent the impact of pollutants. Evaluation of the immune system is one of the methods for monitoring of the employees' health, and testing the system of measures used to improve the working conditions. The study was aimed to identify alterations in the immune status of the employees at the gas processing and high hydrogen sulfide content condensate processing facility depending on their working experience. The working environment and the employees' immune system were evaluated by standard methods. Pollutants were detected with the Bruel & Kjaer 1302 Multi-Gas Monitor, and the Tsvet-550 gas chromatographer. A total of 160 employees and 81 controls (blood donors of the regional blood transfusion station) were surveyed. The immune system was evaluated using the System 9000 Plus hematological analyser, Cyto FLEX LX flow cytometer, UNICO 2100UV specrophotometer, and KFK-3-03-ZОМЗ photometer. It was concluded that the existing complex of occupational and industrial hazards affects the immune status of the main production unit employees, which is reflected in the decreased CD20 levels and increased CD8 levels along with the constant levels of CD4. Correlations were revealed between the immuniglobuline level alterations, decrease in the phagocytic index and phagocytic number, as well in lysozyme activity, and the working experience. Pollutant exposure results in altered immunity of the employees, which could be considered the adaptation mechanism.

Vulcanization of Rubber Compounds

1940 ◽  
Vol 13 (4) ◽  
pp. 918-925 ◽  
Author(s):  
E. W. Booth ◽  
D. J. Beaver
Keyword(s):  
Zinc Oxide ◽  
Hydrogen Sulfide ◽  
Carbon Black ◽  
Physical Properties ◽  
Room Temperature ◽  
Appreciable Effect ◽  
Vacuum Oven ◽  
Rubber Compounds ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

Abstract 1. Rubber dissolves approximately one per cent of hydrogen sulfide when saturated at room temperature. 2. All types of commercial accelerators are retarded in rate of vulcanization as a result of treatment with hydrogen sulfide, and the retardation is directly proportional to the hydrogen sulfide content. 3. The physical properties of mercaptobenzothiazole types of accelerators and diphenylguanidine are not permanently affected by hydrogen sulfide, but dithiocarbamates, thiuram sulfides, aldehydeamines and litharge are permanently affected. 4. Rubber compounds containing mercaptobenzothiazole types of accelerators or diphenylguanidine, which have been treated with hydrogen sulfide and then degassed in a vacuum oven, show normal rate of vulcanization. Compounds containing aldehydeamines, litharge or carbon black show permanent retarding, even after degassing. 5. Increased zinc oxide or sulfur has no appreciable effect on the retardation. 6. Little or no zinc sulfide is formed as a result of treatment with hydrogen sulfide. 7. Hydrogen sulfide treatment of rubber compounds retards the rate of combination of sulfur with rubber. 8. In no case did hydrogen sulfide treatment improve the physical properties of the vulcanizate.

scholarly journals Influence of Selected Substrate Dosage on the Process of Biogas Installation Start-Up in Real Conditions

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5948
Author(s):  
Katarzyna Ignatowicz ◽  
Jacek Piekarski ◽  
Paweł Kogut
Keyword(s):  
Hydrogen Sulfide ◽  
Linear Correlation ◽  
Corn Silage ◽  
Biogas Plant ◽  
Methane Content ◽  
Methane Fermentation ◽  
Engine Operation ◽  
Start Up ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

This paper presents an analysis of selected parameters of biogas, formed as a result of methane fermentation, during the start-up of a biogas installation, using water, liquid manure, corn silage and inoculated sludge as substrates. Moreover, the dependencies between the type and amount of the supplied substrate and the obtained parameters of biogas and fermentation mass are presented and explained. During 59 days after the start of the biogas plant operation, the methane content increased to a maximum of about 62%. Finally, after about 80 days, the methane content stabilized at a constant level of about 55%. CO2 content increased from about 6% (day 32) to about 46% (day 84), with a clear linear correlation between carbon dioxide and methane content. Oxygen content decreased from about 18% (day 32) to about 0.3% (day 84) as the resulting gases displaced air from the reactor, and there was also a linear correlation between oxygen and methane content. The hydrogen sulfide content decreased from about 76 ppm (day 32) to about 0 ppm (day 47), after which, in a clear power correlation to the methane content, it maximally increased to 890 ppm (day 61). However, for the sake of safe engine operation, the desulfurization plant was started on day 63, which resulted in a H2S concentration below 50 ppm on day 74 of the experiment. The final hydrogen sulfide content was 9 ppm on day 84 of the biogas plant start-up.

Sign in / Sign up

Export Citation Format

Share Document