| 摘要 |
PURPOSE: A method and an apparatus for biologically treating a nitrogen oxide-containing waste gas without requiring a large amount of water by treating ammonia-containing circulated water in a treatment system. CONSTITUTION: The nitrogen compound-containing waste gas treatment apparatus for treating a nitrogen compound-containing waste gas comprises a waste gas treatment tanks(4)(5) having microorganism carrier-packed layers(2) equipped with water circulating and spraying mechanisms to pass a nitrogen compound-containing waste gas(1) through, a circulated water storage tank(9) for storing the circulated water, a nitrification mechanism for nitrifying the circulated water, a denitrification tank(6) for denitrifying the nitrified water by reduction, and pipelines connecting these tanks in proper routes. A plurality of the microorganism carrier-packed layers(2) equipped with water circulating and spraying mechanisms are arranged in series and a circulation route of the circulated water is connected to the water circulating and spraying mechanism of the packed layer(2) in the most upstream side(4) to make the water circulating and spraying mechanism also function as to the nitrification mechanism to obtain nitrified water.
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