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Using high-pressure hydrolysis process with sulfuric acid to produce biogas from wheat straw
HŮRKOVÁ, Drahomíra
The presented dissertation assesses the technological and economical use of high-pressure hydrolysis of wheat straw with sulfuric acid (H2SO4) for biogas producing. The theoretical part is focusing to the structure of lignocellulosis phytomass, on technology of mechanical treatment and acid hydrolysis. The experimental part is based on the production of neutralized hydrolyzate obtained by using technology of high-pressure hydrolyse by pressure 1,5 MPa, in retention time of 500 seconds and 190 °C. Data, generated by operation server Linode Platform Manager, emerges, that the area with the best polynormal cubic function, which is aproximated by the smallest mistake. The local extremes, where are the verification of the cumulative CH4 by anaerobic fermentation (in thermophilic area by temperature 51 °C) in relation on dry matter, are calculated of tha data obtained of Maple 14. The highest yeld of CH4 production was found by pressure of high-pressure hydrolyser 2,37 MPa. The maximum value of production of biogas (CH4) was 190 m3. t-1 of dry phytomass. Based on the optimalization, was maximum yeld of CH4 (of biochemical aspects) found about dry matter 8,57 % and pH 4,84. From the managerial point of view, which takes into account technological limitations and financial indicator, are the optimal conditions by dry matter from 3,92 to 5,12 % and a pH of 3,2 to 5,1.
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