Abstract
It has been proved that methane fermentation of sodium and calcium acetates is strongly inhibited by both sodium and calcium sulphites. In the region of optimum pH of this fermentation (pH 6.0 to 6.5) a concentration of 0.003 to 0.01 % sodium sulphite is enough to produce perceptible inhibition. At a concentration of 0.1 % Na2SO3 methane fermentation was inhibited completely for some days. Hereafter a recovery took place, most probably due to the development of micro-organisms converting sulphites to H2S. At a pH higher than 6.5 methane fermentation was less sensitive to Na2SO3 and CaSO3.
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