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Úprava kvality bioplynu
 Paroulková, Petra
This diploma thesis follows to the bachelor thesis Utilization of Algae in Biogas Trans-formations, which was rather a research type and dealt with the removal of carbon diox-ide by photosynthesis of algae from biogas. The aim of this thesis is to examine the issue of undesirable substances in biogas, mainly hydrogen sulfide, and to verify the possibil-ity of using Chlorella pyrenoidosa Chick (IPPAS C2) for the biogas treatment. This ver-ification is based on scientific studies and hypotheses. This culture was grown in the proposed laboratory system in BG11 medium and in BG11 medium with reduced SO4-2 sulfate salts for eight days and nine days. Based on the results of the culture parameters, sulphate formation in the nutrient medium has been proven to be dependent on pH and oxygen. During the measurement, the decrease of hydrogen sulfide concentration was recorded after application of the given culture apparatus. The loss of hydrogen sulfide occurred due to absorption into the nutrient medium. The hypothesis of the ability of algae to consume the resulting sulfate from the medium for their own use has not been confirmed.
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The usage of algae in biogas transformation
 Paroulkova, P. ; Sukačová, Kateřina ; Murgasová, K. ; Vítěz, T. ; Chovanec, J.
Using of algae in a biogas transformation is still in the beginning. However, the microalgae have large potential from the perspective of growing demands on biogas quality and trend of using,natural resources. First of all, it is their ability to fix carbon dioxide (CO2) using photosynthesis and presumed ability of some algae to metabolize hydrogen sulphide (H2S). Biogas contains not only required methane but also components causing its worse quality such as mentioned CO2 and H2S. Therefore, the algae are potential biological systems for biogas-conditioning. The microalga Chlorella pyrenoidosa Chick (IPPAS C2) was used for fixation of CO2 and H2S in our experiment. The microalgae were cultivated in a medium BG 11. The algal suspension was aerated with the biogas during two weeks. Different values of CO2 concentration measured in the input and output confirmed decrease of CO2 caused by intensive growth of algal culture. Decline of H2S was not confirmed.
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1 Paroulková, Petra
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