JPS5712894A - Denitrification of organic waste solution - Google Patents

Abstract

PURPOSE: To enhance the denitrifying efficiency of a denitrification vessel and to obtain dischargeable purified water, by nitrifying an organic waste solution in an aerobic atmosphere, removing dissolved oxygen in an anaerobic atmosphere, and then denitrifying the treated waste solution.

CONSTITUTION: Untreated water 1, i.e. diluted urine sewage, is introduced into a nitrification vessel 2, where the untreated water 1 is mixed with active sludge 4 returned from a final sedimentation vessel 3, adjusted at pH about 6.5W8 by the addition of an alkali from an alkali tank 5, aerated with air 6 to remove BOD components in an aerobic atmosphere, and nitrified. The nitrified liquid 7 is then introduced into a conditioning vessel 8, where the liquid is agitated by a motor 9 in an anaerobic atmosphere to make most of dissolved oxygen disappear. The conditioned liquid 10 is further introduced into a denitrification vessel 11, where a carbon souce 12 is added to the liquid, which is concurrently agitated by a motor 13 is an anaerobic atmosphere and denitrified. Thereafter, the mixed liquid 14 is introduced into the sedimentation vessel 3, where the liquid is separated into a solid and a liquid, and supernatant liquid 15 is drained.

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