A method for treating hygienically unstable waste is disclosed. Waste is allowed to aerobically ferment for approximately 36 hours at a temperature of 40 to 50° C. During aerobic fermentation, an external air supply maintains the appropriate temperature, while restacking of the substrate ensures uniform oxygen distribution. After approximately 36 hours of aerobic fermentation, the amount of externally supplied air is decreased, leading to a gradual temperature rise. The substrate is kept at a temperature range of 70 to 80° C. for a period of 30 to 60 minutes, followed by intensive aeration which is performed until the maximum moisture content of 10% is reached. The waste has then been converted to a hygienically stabilized product.
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