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Abstract The contact oxidation method is used to remove nitrogen from coking wastewater. In the process, biological hanging film with three-dimensional elastic packing arranges in aerobic tank, and the dissolved oxygen is provided for the microorganism and stirs the mixing solution through the bottom microporous aeration plate, thereby making the ammonia nitrogen in wastewater be absorbed, degraded and transformed by microorganisms. The aperture of microporous aeration plate is very small, so many problems can appear. The corresponding improvement measures were put forward aiming at the existing problem of microporous aeration system.
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