Verfahren zum Kompostieren von mit Schadstoffen kontaminierten Abwasserschlamm und Abfallholz durch aerobes Verrotten sowie eine Anwendung

摘要

The mixed material composed of sewage sludge and waste wood is composted in a plurality of process steps. For this purpose, the material is placed in a long container (10) and, during the composting process, is regularly mixed and broken up, slowly moved along the container (10) and the compost discharged from the container (10) by means of a conveyor machine (19). In this case, each particle of the composting material (21) is moved through a plurality of zones (13) of the container (10), at the same time the composting material (21) being aerated at intervals from the base (12). During this, a roughly stable heat and oxygen layering is formed in each zone (13) in the composting material (21) with an aerobic microorganism population, the temperature (T) of the composting material (21) preferably changing along the container (10). This controlled aerobic fermentation and possible ripening has the purpose of achieving the composting of each particle of the material (21) within an expedient residence time in the container (10) of 18 to 24 days. The compost produced is stabilised, odour-free and dry, has the appearance of soil and has a structure like peat; the end product is usable as a fuel for furnaces.