Abstract
<p>This paper focuses on the study the possibility of phosphogypsum utilization in the biotechnological processes for hydrogen sulfide removal from biogas. The optimal parameters of the process of granulation dihydrate phosphogypsum were determined. The biochemical characteristics of granular carrier based on phosphogypsum was studied. The efficiency of the gas cleaning under immobilization of the thiobacillus on the surface support medium was analyzed. The main parameters of the gas cleaning process were determined. The degree of H<sub>2</sub>S removal from a gas stream was 98.22% at pH = 5.0 and optimum empty bed residence time of 10 h. The possibility of the phosphogypsum using as a new type of mineral support medium for the associations of sulfur-oxidizing microorganisms developing was determined in the process of biological gases purification from sulfur compounds. It was the first time both theoretically and experimentally proved that the mineral support on the basis of phosphogypsum has a sufficient micro and macro elements that necessary for the thiobacteria development. Thus it is eliminating the need to supply additional sources of feeding organisms to biofilter. The gas purification biotechnology with support medium using on the basis of phosphogypsum was developed. This technological solution which allows providing the high quality of gas stream purification with a high content of sulfur compounds, particularly hydrogen sulfide (more than 10% of the gas total volume).</p>
Highlights
This paper focuses on the study the possibility of phosphogypsum utilization in the biotechnological processes for hydrogen sulfide removal from biogas
Ideal microorganisms would have the ability to transform H2S to elemental sulfur, could use CO2 as their carbon source, could produce elemental sulfur that is to separate from the biomass, would avoid biomass accumulation to prevent clogging problems, and would be able to withstand a variety of conditions
Desulfurization resulted in forming of acidophilic microorganisms association that is able to oxidize hydrogen sulfide to form elemental sulfur in an acidic environment
Summary
Its hydrogen sulfide content must be eliminated to avoid possible damages to equipment and hazards to users and the environment. Microorganisms have been used for the removal of H2S from biogas. Ideal microorganisms would have the ability to transform H2S to elemental sulfur, could use CO2 as their carbon source, could produce elemental sulfur that is to separate from the biomass, would avoid biomass accumulation to prevent clogging problems, and would be able to withstand a variety of conditions (fluctuation in temperature, moisture, pH, O2/H2S ratio, for example). Chemotrophic thiobacteria can be used both aerobically and anaerobically. They can utilize CO2 as a carbon source and use chemical energy from the oxidation of reduced inorganic compounds, such as H2S [1]
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