Table I shows the present state of industrial waste generation and recycling ratios in Japan.
Thirty percent of discharged waste disappears by intermediate treatment and 407o arc reused
owing io the technical developments in waste management and utilization. The intermediatc
treatment methods are incineiation, dehydration, and melting. Incincration, which rcalizes
volume reduction and sanitary resolution against putrescible substances, is becoming morc
widely used. Sludges, which have high water contents, are reduced in volume by dehydration
as well as incineraiion. The melting method has been developed mainly for the treatment of
sewage sludge for utilization purposes. However, rubbish from cons'truction works arc
scarcely reduced by intermediate
treatment