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Hydrogen monitoring in anaerobic sludge bed reactors at various hydraulic regimes and loading rates

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The dissolved hydrogen concentration was monitored in four laboratory-scale upflow sludge bed reactors. The upflow velocity (υUP) differed in each reactor, providing different hydraulic regimes. Five pseudo-steady-state conditions were applied to the four reactors. The dissolved hydrogen concentration increased proportionally with the organic loading rates (OLR) of the reactors, to attain values as high as 20 μM, while still remaining independent of the hydraulic regime. The experimental data yielded low hydrogen mass-transfer rates (kLa) and high ratios of the measured dissolved hydrogen concentration value to the equilibrium value calculated from the hydrogen partial pressure in the gas phase (sursaturation factor): from 0.04 to 0.46 h−1 and from 19 to 102, respectively. Also, the increase in the υUP did not affect the hydrogen kLa nor the sursaturation factor. The kLa values showed a reasonable and positive correlation with the OLR values and the gasflow rates, however no correlation was found between the sursaturation actor values and the latter parameters. This indicates that dissolved hydrogen concentration can not be predicted from hydrogen gaseous measurements in such reactors.

Keywords: anaerobic digestion; dissolved hydrogen; liquid upflow velocity; mass transfer; sursaturation

Document Type: Research Article


Publication date: 1993-05-01

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    Water Environment Research� (WER�) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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