The implementation of microaerobic conditions often improves the results of anaerobic digestion. The study was focussed on comparison of digested sludge quality after shift from strictly anaerobic to microaerobic sludge digestion. The compared parameter were: chemical compostion of sludge, specific activity of methanogenic bacteria, foaming potential and dewaterability of sludge. In most parameters the quality of sludge digested at microaerobic and anaerobic conditions is comparable often the quality of microaerobic sludge is better. From the operational point of view it is very important that foaming of microaerobic digester was lower and the dewaterability was better for microaerobic sludge.
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