Ammonia nitrogen wastewater treatment method and ammonia nitrogen wastewater treatment system for wet dust collection blast furnace gas system

Abstract

The invention discloses an ammonia nitrogen wastewater treatment method and an ammonia nitrogen wastewater treatment system for a wet dust collection blast furnace gas system. The method realizes ammonia nitrogen wastewater treatment by six steps of detection of water quality conditions; lime softening; settling and separating; air stripping; blowoff, sewage discharge and decyanation treatment ofblast furnace gas. The system comprises a circumferential seam scrubbing tower, wherein a blast furnace gas inlet pipe is arranged at the top of the circumferential seam scrubbing tower; a scrubbing water return port and a scrubbing water inlet are formed in the side wall of the circumferential seam scrubbing tower from top to bottom; the side wall of the circumferential seam scrubbing tower is provided with a gas outlet; a gas utilizing system is connected to the gas outlet; a return water elevated flow slot, a settling pond, a hot water pool, a cooling tower and a cold water pool are sequentially connected to the scrubbing water return port through a pipeline; the cold water pool is connected with the scrubbing water inlet through a circular water supply pipe. According to the ammonia nitrogen wastewater treatment method and the ammonia nitrogen wastewater treatment system disclosed by the invention, the wastewater amount is reduced by using an evaporative cooling principle, and no water treatment structure or increase of energy consumption for water treatment is needed; the ammonia nitrogen wastewater treatment method and the ammonia nitrogen wastewater treatment system have thecharacteristics of less investment, low cost, reliable operation and the like.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment in the iron and steel industry, in particular to a method and system for treating ammonia nitrogen wastewater in a blast furnace gas system with wet dust removal. Background technique [0002] The concentration of ammonia nitrogen and the total discharge of wastewater discharged from iron and steel enterprises are the online monitoring indicators of the government's environmental protection department, and it is necessary to ensure that the discharge meets the standards. From the analysis of the source of ammonia nitrogen wastewater, the organic ammonia nitrogen wastewater of iron and steel enterprises mainly comes from the coking process and the condensation drainage of the coke oven gas pipeline, and the inorganic ammonia nitrogen wastewater mainly comes from the spray sewage of the blast furnace gas system and the condensation drainage of the blast furnace gas pipeline. [0003] Fr...

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Problems solved by technology

[0011] The purpose of the present invention is to address the various deficiencies in the application of the existing ammonia nitrogen wastewater treatment method in the field of ammonia nitrogen treatment of the sewage of the blast furnace gas wet dedusting system in iron and steel enterprises; to provide a wet dedusting blast furnace gas system ammonia nitrogen wastewater treatment method and its system ;Using this method can greatly reduce the discharge concentration and total amount of inorganic ammonia-nitrogen wastewater from iron and steel enterprises, without the need to build new water treatment structures and increase energy consumption, so as to reduce the cost of ammonia-nitrogen wastewater treatment and investment in engineering construction

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