Abstract
The authores carried out the experiment on the treatment of swine wastes with two types of rotary heated air dryeres (batch type and continuous type), which are generally used for fowl feces treatment in Japan.
The results are summarized as follows:
(1) Moisture contents of raw wastes, 70.6% in case of batch type and 65.3% in continuous type, were respectively decreased to 22.6% and 12.5% after drying. It seems that the difference of moisture contents of dryed wastes were caused by the characteristics of the dryers, but not by the raw wastes moisture.
(2) Dry wastes yield ratio (dry/raw) were 38.6% in batch type and 39.7 % in continuous type.
(3) The drying efficiency (decreasing weight/A type heavy oil 1kg.) were from 5.31 to 8.86kg/kg.
(4) The treatment capacity of raw wastes per hour were 230.8kg/h in batch type and 132.1kg/h in continuous type.
(5) The chemical components of dry wastes in batch type and continuous type were respectively 2.99 and 3.15% of nitrogen, 6.50 and 8.60% of P2O5, and 1.78 and 0.98% of K2O.
