NOVELTY - Determining the metabolic stability of sewage sludge (3), comprising interrupting the oxygen supply to the sludge 7 times in same time interval and determining the oxygen content of the sludge before each interruption of the oxygen supply in the same time interval from the beginning of the interruption of the oxygen supply. The metabolic stability is determined from a change of the calculated oxygen content. An oxygen depletion of the sludge is observed after the interruption of the oxygen supply and the gradient of the oxygen content is observed during the oxygen supply.    USE - The metabolic stability determined sewage sludge is used as manure for plants.    ADVANTAGE - The procedure for metabolic stability determination of sewage sludge, is feasible in very simple manner and requires minimum machine expenditure.    DETAILED DESCRIPTION - Determining the metabolic stability of sewage sludge (3), comprising interrupting the oxygen supply to the sludge 7 times in same time interval and determining the oxygen content of the sludge before each interruption of the oxygen supply in the same time interval from the beginning of the interruption of the oxygen supply. The metabolic stability is determined from a change of the calculated oxygen content. An oxygen depletion of the sludge is observed after the interruption of the oxygen supply and the gradient of the oxygen content is observed during the oxygen supply. The oxygen is supplied to the sludge by blowing compressed air for 30 minutes and the interruption of the oxygen supply takes place for 10 minutes. The oxygen supply raises the oxygen content of the sludge up to a saturation concentration. A remainder treatment for the sludge is determined from the volume of the oxygen supply and the change of the oxygen content. The oxygen content and the metabolic stability are transmitted for each sewage sludge quantity led into a grounding basin, to a monitoring device (15) for the long-term monitoring of the loading and/or controlling of the feeding of the grounding basin.    DESCRIPTION OF DRAWING(S) - Metabolic stability measuring device for sewage sludge:    Sewage sludge; (3)    Aquarium pump; (4)    Timer; (6)    Monitoring device. (15)