Abstract
Maintenance and growth of Methanosarcinae-dominated granules under different Mg 2+ concentrations (0–100 m m) were investigated in 0.2-l acetate-fed UASB reactors at 55°C. In the absence of Mg 2+ in the medium, a decrease in the conversion of acetate was observed and 50% of the biomass was washed out from the reactor. Furthermore, a change in the bacterial flora occurred, giving rise to fluffy granules consisting mainly of rod-shaped methanogens. The addition of 100 m m Mg 2+ caused disaggregation of Methanosarcina packets and release of a high number of single cells, corresponding to 20% of the biomass, which were washed out from the reactor. No wall growth or washout of biomass could be seen when the Mg 2+ concentration was under 30 m m. An increase in the Mg 2+ concentration from 0.5 to 10 m m resulted in better performance of the UASB reactor.
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