Řízení procesu anaerobní digesce pomocí koncentrace rozpuštěného vodíku

Abstract

The dissertation focuses on the possibilities of monitoring and early detection of instability in the anaerobic digestion process. For the early detection of this instability, the dissertation verifies the possibility of monitoring hydrogen dissolved in anaerobic suspension. Hydrogen is a key intermediate in the multiphase anaerobic digestion process. The importance of dissolved hydrogen lies in its important role in maintaining the balance between microbial communities that are responsible for stable anaerobic decomposition of organic matter. As part of the experimental work, five experiments of single-stage mesophilic anaerobic digestion were carried out in the INFORS HT Terrafors IS rotary drum bioreactor, with different types of substrate - food residues from the university canteen and corn silage - and different dosing intensities. Excessive concentration of dissolved hydrogen should reveal process instability earlier than the currently used method based on titration of organic acids and buffer capacity. The most promising results were provided by the last experiment, in which corn silage was used as a substrate. In this experiment, the amount of dissolved hydrogen has been shown to be a promising parameter for detecting anaerobic digestion instability. The critical issue was the dissolved hydrogen microsensors used, which were originally designed by the manufacturer for much purer aqueous samples and suffered from insufficient sensitivity and short lifetime during regular measurements. In addition, the results may be affected by sensitivity to other chemical compounds contained in the digestate.