C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/15
C02F 1/74 (2006.01) C02F 1/72 (2006.01) C02F 11/08 (2006.01)
Patent
CA 1130935
ABSTRACT OF THE DISCLOSURE The present invention provides a process for treating ammonia-containing waste water which comprises introducing at a pH of about 8.5 to about 11.5 the waste water to a reactor to subject the same to wet oxidation with an oxygen-containing gas in the presence of a catalyst while maintaining the waste water at a temperature of about 100 to about 370°C and at pressure permitting the waste water to remain in the liquid phase, the oxygen-containing gas containing oxygen in an amount of about 1 to about 1.5 times the theoretical amount required for decompos- ing the ammonia, organic substances and inorganic substances con- tained in the waste water, the catalyst being supported by at least one of zirconiz and titania and comprising at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold r tungsten and compounds thereof insoluble or sparingly soluble in water, and supplying an alkali substance to the reactor at a rate required to maintain at least about 80% of the waste water introduced to the reactor and positioned to- ward the water inlet of the reactor at a pH of at least about 8 at all times and to permit the water resulting from the wet oxi- dation to retain a pH of about 5 to about 8.
352040
Harada Yoshiaki
Kakihara Naomichi
Uedono Norio
Marks & Clerk
Osaka Gas Company Limited
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