Measurement of Dissolved Hydrogen in an Anaerobic Digestion Process by a Membrane-Covered Electrode

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Dissolved hydrogen in an anaerobic digestion process was continuously measured by a voltammetric membrane electrode which consisted of a Pt-Pt black and Ag-AgCl covered FEP membrane with 0.1M KCl and 0.1M HCl. This sensor showed high reliability and sensitivity(i.e., detection limit : 50nM)in distilled water. The sensor was not affected by several compounds in the anaerobic digestion media(e.g., inorganic salts, acetate, and propionate)except for sulfide. The indication in a sample containing 0.56mM sulfide corresponded to that of 0.26μM dissolved hydrogen. The sensor was also applied to measure the dissolved hydrogen in a laboratory-scale anaerobic reactor, and the dissolved hydrogen was continuously monitored for 565-h. The sensor was calibrated every 120-h, and the output signal was very stable during this period. The dissolved hydrogen concentration ranged from 0.5 to 3μM, and H_2 partial pressure from 2 to 7 Pa in the gas phase. A good correlation(r=0.85)between theoretical values calculated with H_2 partial pressure and the output signals was recognized. The actual dissolved hydrogen concentration was about 60-fold higher than the theoretical values calculated with H_2 partial pressure.
社団法人日本生物工学会の論文
1991-06-25