Dissolved air floatation type sewage treatment device

Abstract

The invention provides a dissolved air floatation type sewage treatment device and relates to the technical field of sewage treatment, aiming at solving the technical problems of improving purification effect, increasing clear water yield and prolonging a sludge cleaning period. The dissolved air floatation type sewage treatment device comprises a material tank, a dissolved air tank, a sewage pump, an air compressor and a floatation treatment tank, wherein a water inlet of the sewage pump is respectively connected to an external sewage source and the material tank, a water outlet of the sewage pump and a high-pressure air output port of the air compressor are respectively connected to a sewage inlet of the dissolved air tank, the cavity of the floatation treatment tank is divided into two sub-cavities by a baffle plate, the tops of the two sub-cavities are communicated, the two sub-cavities are respectively a water inlet cavity and a mud-water separation cavity, the water inlet cavity is divided into an upper subarea and a lower subarea by a packing layer, a sewage inlet of the water inlet cavity is arranged below the packing layer and is connected to a sewage outlet of the dissolved air tank through a water inlet valve, the mud-water separation cavity is divided into an upper subarea and a lower subarea by a mud separation layer, a mud separation groove is formed in the top of the mud-water separation cavity, and a water outlet lower than the mud separation layer is arranged on the wall of the mud-water separation cavity. The dissolved air floatation type sewage treatment device provided by the utility model is suitable for sewage treatment.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to the technology of a dissolved air flotation type sewage treatment device. Background technique [0002] Dissolved air flotation technology is a technology that uses flotation to treat sewage. In addition to removing oil in the emulsified state in sewage, this technology is also widely used to remove fine suspended particles in sewage with a density close to water. Impurities, the principle is to try to generate a large number of micro-bubbles in the water to form a three-phase mixture of water, gas and the substance to be removed. Under the combined action of interfacial tension, bubble buoyancy and hydrostatic pressure difference, etc., promote After the fine bubbles adhere to the removed tiny impurities, they float to the surface of the water because the density of the bonded body is lower than that of water, so that the impurities in the water are separated and removed. [0003]...

AI Technical Summary

Problems solved by technology

[0003] At present, when the dissolved air flotation technology is used to treat sewage, the sewage containing a large number of air bubbles and drugs is directly injected into the flotation treatment tank. This treatment method has the following defects: 1) The sewage often contains large air bubbles , which makes the water body more disturbed, and the large bubbles are also easy to break due to the disturbance, and the particles entrained by it will dissolve in the water again, resulting in more mud in the final effluent and poor water purification effect

2) In the flotation treatment tank, the separation zone between the sludge zone and the clean water zone is thicker, which affects the thickness of the clean water zone. On the one hand, it affects the output of clean water, and on the other hand, the cleaning period of the sludge at the bottom of the tank is also short.

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