(l) Kawasaki's new KADDIS is an integrated system of sewage sludge cake treatment.
    The KADDIS can be operated in two ways in accordance with operator's option;
    while the system can work as a dryer only where sludge powder/granule is 
    generated as product, incinerating mode can be easily selected.

(2) In the KADDIS, warming of digester is carried out without any boiler, by 
    direct contacting between the dryer outlet gas(medium high temperature air) 
    and sludge to be fed to the digester. This function of digester warming makes 
    the KADDIS very energy-saving.

2. Facilities and processes of the KADDIS

(l) The KADDIS consists of three (3) elemental facilities:drying facilities 
     (a dryer), a furnace and a sludge warming tower.

(2) The dryer is of flush type, using hot air as a drying thermal medium and 
    consisting of a disintegrator, an upflow drying main pipe, a cyclone 
    collector and some hoppers.
    The sludge cake is fed into the disintegrator after mixed with dried powder/
    granule, where the hot air is sent into from the heat exchanger mounted to 
    the fornace.
    The cake becomes the powder/granule whose humidity content is 10a/, or less 
    through the disintegrator and the upflow main pipe, then being separated 
    into a hopper in a cyclone collector.  The dried sludge powder/granule can 
    be discharged from the hopper when necessary.

(3) In the furnace which is of vertical type with a cyclone burner, the sludge 
    powder/granule from the dryer is incinerated at the temperature of 
    700 - 800 deg.C.A heat exchanger which generates hot air to be used in the 
    dryer is also mounted to the furnace.

(4) In the sludge warming tower, the dryer outlet air of high humidity and of
    medium temperature is washed out by spraying thickened liquid sludge to 
    remove the humidity from the air and simultaneously to warm up the liquid 
    sludge to be fed to the digester.

3. Applications

(1) The KADDIS may be applied most suitably to the sewage treatment plant wher
    digester is equipped with and sludge cake treatment (drying or incineration) 
    is necessary.  
    The digester is, however, not indispensable element in the KADDIS. When the 
    digester is not combined, oil can be easily used as an auxiliary fuel.  The 
    excellent high thermal efficiency of the KADDIS can minimize the fuel
    consumption in this case.

(2) The KADDIS can be not only used in the sewage treatment plant but also applied
    effectively for the treatment of sludge from various sources, the sludge 
    homogeneity being the only one requirement.

(Fig) FLOW SHEET OF KADDIS