The present invention provides a
processing method which can process
biomass resources to a
carbide having a uniformity and including a large amount of high-carbon
charcoal, can hold down an
initial cost while capable of executing a large amount of process (for example, 100
ton per day), has a low running cost while can suppress a fuel consumption to a significantly low level, and can continuously carbonize a object having a
high water content, having an unstable shape and having a high
viscosity such as a
sewage sludge even being a simple structure. The
carbonization processing method has the steps of (i) continuously supplying a
processing object M which is not preliminarily treated, or a processing object M which is formed at a predetermined magnitude by a preliminary treatment such as a fragmentation, a
water content reduction or the like, from an upstream side of a cylindrical
rotary kiln in which a spiral carrier wall is provided in an inner
peripheral surface in an entire length and an agitating wall
cutting across the carrier wall is formed in the carrier wall in a middle portion from the upstream side at a predetermined unit amount while rotating the
rotary kiln, (ii) blowing a
flame in an inner portion of the
rotary kiln from a downstream side in a carrying direction of the rotary
kiln in the state (i), and stopping the blowing of the
flame if the processing object M is ignited within the rotary
kiln, (iii) supplying an air necessary for burning a
combustible gas generated from the processing object M to an inner portion of the rotary
kiln from a downstream side, and
self burning the
combustible gas without supplying any fuel, (iv) sucking a gas generated in the inner portion of the rotary kiln from the upstream side of the rotary kiln so as to detoxify and
discharge, and (v) discharging the
carbide of the processing object M from an outlet in the downstream side of the rotary kiln so as to cool by executing the operations in the (i) to (iv).