Refuse conversion into compost - by moisture admixture in revolving drum and screen basket

摘要

Domestic refuse is homogenized, mixed and ground, after the admixture of water or sewage sludge to raise the moisture content to 45-60%, in a horizontal drum mill. The mill volume is so dimensioned that a constant feed results in a short residence time in the drum. The fraction which can be turned into compost is separated at the discharge end by a screen basket which rotates with the drum. This results in an excellent separation of the fraction which can be processed into compost (paper) from that which cannot be processed. The capital investments and the operating cost of the whole plant are optimized.