A nitrite nitrogen preparation device and a method for autotrophic denitrification using the device

By designing a nitrosity nitrogen preparation device, the problem of insufficient NO2- accumulation in autotrophic nitrogen removal is solved by using short-range nitration of microorganisms and anaerobic ammonia oxidation reactions, and efficient autotrophic nitrogen removal is achieved, saving resources and reducing operating costs.

CN109534502BActive Publication Date: 2025-03-25THUNIP CORP LTD +1
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Patent Information

Application Number
CN201811525697.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2018-12-13
Publication Date
2025-03-25
Estimated Expiration
2038-12-13

AI Technical Summary

Technical Problem

In the existing autotrophic nitrogen removal process, anaerobic ammonia oxidizing bacteria are inhibited by dissolved oxygen, resulting in insufficient NO2- accumulation, affecting the autotrophic nitrogen removal efficiency.

Method used

A nitrosity nitrogen preparation device is designed, including a biological reaction tank, a push-flow stirring structure, a nitrite preparation device and a separation structure. It generates NO2- accumulation in water through short-range nitration of microorganisms, and nitrogen is generated by the anaerobic ammonia oxidizing bacteria enriched on the fluidized biological carrier.

Benefits of technology

The accumulation of NO2- is achieved, the inhibitory effect of dissolved oxygen is reduced, and autotrophic nitrogen removal is achieved to the maximum extent, which saves oxygen supply and carbon source, and reduces operating costs.

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Abstract

The invention relates to the technical field of sewage treatment, and discloses a nitrite nitrogen preparation device and a method for autotrophic denitrification using the device, comprising a biological reaction tank, wherein there are flowing sewage and activated sludge, and a fluidized biological carrier is added into the biological reaction tank; by arranging a plug flow stirring device, the biological reaction tank makes the sewage, activated sludge and fluidized biological carrier in the biological reaction tank mixed and then circulate in a first direction; a nitrite preparation device is arranged in the biological reaction tank and close to a liquid outlet, and can provide air into the biological reaction tank, thereby providing a small amount of oxygen for the fluidized biological carrier in the tank, and generating NO in water through short-range nitrification. 2 ‑ The nitrite nitrogen preparation device can generate nitrogen gas by enriching anaerobic ammonia-oxidizing bacteria on the biological carrier to remove the total nitrogen in the water; the separation structure is arranged in the biological reaction tank and located at the front end of the liquid outlet. The nitrite nitrogen preparation device has the advantages of energy saving and carbon saving.
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