Dissolved air flotation contact chamber

Abstract

The invention discloses a dissolved air flotation contact chamber and aims to solve the problem of poor sewage treatment effect caused by bad contact between air dissolved water and sewage. The dissolved air flotation contact chamber comprises an air flotation tank and an air-sewage contact cylinder, and the air-sewage contact cylinder is vertically arranged at a position, close to the side wall, in the air flotation tank. The side wall of the lower end of the air-sewage contact cylinder is tangentially communicated with a sewage inlet pipe which is communicated with a dissolved air water inlet pipe. The upper end of the air-sewage contact cylinder is communicated with a distribution pipe in horizontal arrangement, and the outer wall of the distribution pipe is provided with an elongated release port along the length direction. By the dissolved air flotation contact chamber, a fusion path of bubbles in the dissolved air water and suspended solid in the sewage is lengthened, and accordingly microbubble utilization rate is increased, and equipment treatment effect is improved. Due to vertical arrangement of the contact cylinder, on the one hand, uniformity in contact time of the sewage and the dissolved air water is benefited, and sufficient contact can be realized; on the other hand, mixed sewage solids are forced to directly flow to liquid surface, so that suspension up-floating time is shortened, and treatment efficiency is improved.

Description

technical field [0001] The invention relates to an air flotation system, more specifically, it relates to a dissolved air flotation contact chamber with good contact effect. Background technique [0002] The flotation treatment of sewage with pressure dissolved air flotation system is a physical treatment method in the sewage treatment process. It is released by the release device after the dissolved air water produced by the "dissolved air machine" is injected into the treated sewage , Saturated dissolved air water releases countless fine bubbles under normal pressure. These fine bubbles stick the suspended solids in the sewage and float to the water surface together under the action of their buoyancy, and then use tools such as scrapers to remove the suspended solids. In the treatment process of the dissolved air flotation system, the contact between the suspended solids in the sewage and the air bubbles is a very important link. In the commonly used dissolved air flotatio...

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Problems solved by technology

[0004] The present invention overcomes the following deficiencies of the existing air flotation contact chamber: (1) In the contact chamber designed as a cuboid, the probability of contact between microbubbles and suspended solids in sewage is relatively small, and only some tiny bubbles can stick and float suspended solids , some microbubbles float directly because they do not touch the suspended matter, which affects the utilization rate of the microbubbles and the processing efficiency of the equipment; (2) During the process of the mixed liquid moving in the horizontal direction, it is released from the contact cylinder When the mixed liquid flows out, it is strong or weak, and the contact time is different. The water flow near the water inlet is faster and the contact time is shorter; the water flow is weaker and the contact time is longer in the place far away from the water inlet. Insufficient contact between dissolved air water and sewage; (3) The structure is complex and difficult to manufacture; (4) It takes up a lot of space in the box, and the space of the subsequent separation chamber cannot be reduced (that is, the separation time cannot be shortened), which means The volume of the box body increases, the floor area and the cost of the box body increase; the invention provides a dissolved air flotation contact chamber, which prolongs the contact path between the bubbles in the dissolved air water and the solid suspended matter in the sewage, and the microbubbles and the sewage The probability of suspended matter contact is greatly increased, which improves the utilization rate of microbubbles and improves the treatment effect of the equipment; the vertical arrangement of the contact tank, on the one hand, is conducive to the uniform contact time of sewage and dissolved air water, and the contact is sufficient; The sewage solids flow directly to the liquid surface, reducing the floating time of suspended solids and improving treatment efficiency; moreover, this scheme has simple structure, low manufacturing cost and high space utilization rate, which can reduce the overall volume of the tank and save materials and Floor area

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