Biological intermediate sewage treatment with ozone...

Details Biological intermediate sewage treatment with ozone... Biological intermediate sewage treatment with ozone...

C - Chemistry, Metallurgy

02

F

362/44.5

C02F 3/12 (2006.01) C02F 1/00 (2006.01) C02F 1/78 (2006.01) C02F 3/02 (2006.01)

Patent

CA 1056965

BIOLOGICAL INTERMEDIATE SEWAGE TREATMENT WITH OZONE PRETREATMENT Abstract of the Disclosure A process for intermediate treatment of aqueous sewage containing biodegradable materials and non- biodegradable materials. The sewage is contacted with an ozone-containing gas to pretreat the sewage by converting a substantial amount of the non-biodegradable material to biodegradable material, followed by a conventional secondary treatment with an O2-containing gas such as air in the presence of aerobic or facultive anaerobic micro- organisms. The process may also include subsequent tertiary treatment with ozone to destroy the micro-organisms after secondary treatment. A relatively small amount of the overall oxidizing gas requirements is provided by ozone. The secondary treatment is made more efficient by the ozone pretreatment.

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