Non-backwashing type movable nitrogen-removing device for denitrification filter tank

Abstract

The invention provides a non-backwashing type movable nitrogen-removing device for a denitrification filter tank. The non-backwashing type movable nitrogen-removing device comprises a sealing cover arranged at the top of the denitrification filter tank, wherein the sealing cover can be made into a fixed type sealing cover for a single filter tank; a closed space defined by the sealing cover, tank walls at the periphery of the denitrification filter tank and the ground is used as a sealed bin; a ventilation pipeline is arranged at the top of the sealing cover, one end of the ventilation pipeline communicates with the sealed bin, and the other end of the ventilation pipeline communicates with a vacuum pump; and a vacuum valve and an air inlet valve are arranged on the ventilation pipeline. According to the non-backwashing type movable nitrogen-removing device, the upper part of the denitrification filter tank can form a negative pressure state, so pressure acting on nitrogen bubbles is reduced, the nitrogen bubbles are promoted to expand and are compounded with one another, and a filter layer of the nitrogen bubble denitrification filter tank is separated; and the non-backwash type movable nitrogen-removing device is used for removing nitrogen in the denitrification filter tank, and a biological membrane in the filter layer cannot be damaged while nitrogen is efficiently removed, so denitrification effect is ensured.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a nitrogen driving device, in particular to a non-backwashing movable nitrogen driving device used in a denitrification filter tank. Background technique [0002] Denitrification filter is a common structure for denitrification treatment of domestic sewage and urban sewage. The principle of denitrification is to reduce the nitrate nitrogen in the water to nitrogen by means of the catabolism of the denitrifying bacteria in the biofilm growing on the surface of the filter material in the filter tank, using the original organic matter in the water or the artificially added organic matter. , so as to achieve the purpose of denitrification. The generated nitrogen gathers on the surface of the filter material in the form of microbubbles, occupying the water flow space in the filter layer, which increases the flow resistance of the filter when filtering. Therefore, the denitrification filt...

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Problems solved by technology

Although this method can achieve the nitrogen removal effect on the denitrification filter, it consumes a lot of water. At the same time, it is even more unfavorable that the friction and collision of the filter material during backwashing and the shear force of the water flow make the surface of the filter material A large number of biofilms fall off, resulting in the denitrification effect of the filter is greatly reduced after the nitrogen flooding is completed, and the filter work is extremely unstable

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