Composting of sewage sludge - continuous process controlled by ventil-ation with oxygen enriched air

摘要

Sewage sludge is composted by a process of decompsn. controlled by the volume of air fed into the mass. The sludge from which the bulk of the water has been extracted, is fed in, mixed with a source of carbon such as peat, sawdust or recirculated compost, to a reactor, into which air enriched with pure oxygen is blown from below in a contrary direction to the movement of the sludge, setting up zones of differing temp. and oxygen content the hottest zone being in the upper third of the mass and that with most oxygen in the lower third.