Nitrogen-containing waster water purification method

Abstract

The invention discloses a nitrogen-containing waster water purification method. A denitrification pool, a partial nitrosation pool, an intermediate pool, an anaerobic ammonium oxidation pool and a water outlet reflux system are sequentially arranged; sewage and the outlet water of the anaerobic ammonium oxidation pool enters the denitrification pool respectively through a water inlet end and a reflux pump, and NOx in the outlet water of the anaerobic ammonium oxidation pool is reduced into nitrogen gas by utilizing organic matter in the sewage or additional organic matter as a carbon source under the action of denitrification bacteria; the outlet water with high pH value of the denitrification pool enters the partial nitrosation pool, and ammonia nitrogen in the outlet water of the denitrification pool is oxidized into nitrite nitrogen under the action of nitrobacterium; then, the outlet water of the denitrification pool enters the intermediate pool for adjustment; and finally, the supernatant separated out by the intermediate pool is pumped into the anaerobic ammonium oxidation pool by the pump, is subjected to denitrification reaction under the action of anaerobic ammonium oxidation bacteria, and for the outlet water of the anaerobic ammonium oxidation pool, one part flows back to the denitrification pool, and the other part is directly discharged. The nitrogen-containing waster water purification method has the advantages of stability in running, low investment and running cost, convenience in management, high efficiency for removing pollutant and the like.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a nitrogen-containing wastewater purification method. Background technique [0002] Nitrogen-containing wastewater is one of the main causes of eutrophication in water bodies, so nitrogen-containing wastewater needs to be treated before it can be discharged. The traditional denitrification process is based on oxidizing ammonia nitrogen to nitrate nitrogen or nitrite nitrogen under the action of nitrifying bacteria, and then reducing it to nitrogen under the action of denitrifying bacteria. This will consume a lot of energy, especially when the organic carbon source in the wastewater is insufficient, an additional carbon source is required, resulting in excessive operating costs. As a newly discovered strain that can use nitrite nitrogen to oxidize ammonia nitrogen into nitrogen, anammox bacteria has been paid more and more attention by various countries because it can save a lot of e...

AI Technical Summary

Problems solved by technology

However, the effluent treated by the anaerobic ammonium oxidation tank has a high pH value and contains NO x , cannot be discharged directly, and still needs secondary treatment. In addition, in order to maintain a certain pH value during the operation of some nitrification tanks, a large amount of lye needs to be added, which increases the operating cost to a certain extent.

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