C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/2
C02F 11/12 (2006.01)
Patent
CA 1039863
ABSTRACT OF THE DISCLOSURE This invention relates to and discloses a novel method for treating organic sludge and an apparatus therefor. The sludge to be treated is preheated in a heat exchanger by means of indirect conventional heat exchange with oxidation- treated sludge, then admixed with air of 10-30 times the amount of the sludges, the air containing isolatable oxygen which reduces the COD of the sludge by 2-4%, and with steam to heat the sludge to 130°-150°C. The admixed sludge is thereby partially oxidized in a reactor which includes an oxidizing chamber and a heat concentrating chamber which is pressurized below 10 kg/cm2 for more than 30 minutes. This method is characterized by the inclusion of the step of removing incorporated sand from the preheated sludge in the heat exchanger by a sand removing device prior to its pressure-fed travel to the reactor. This method and apparatus therefor provides an improvement over the prior art processes and is suitable for not only sewage but also for petrochemical waste water, food- processing waste water and the like. It prevents the formation of bad odours and gases from the treatment system and effectively removes the sand from sludge thereby extending considerably the life of the apparatus and producing a more efficient process.
218654
Shimizu Ko
Toda Ichiro
Uchimura Terumi
Uede Kenichi
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