Scraper-adjustable sewage treatment air floatation unit

Abstract

The invention relates to a scraper-adjustable sewage treatment air floatation unit. The air floatation unit comprises a tank body, the left side of the tank body is a fast-slow mixing tank, and a contact chamber and a separation chamber are arranged in the middle of the tank body. The fast-slow mixing tank is communicated with the two sides of the contact chamber through sewage pipelines. A releaser is arranged in the contact chamber, the releaser is connected with a gas dissolving system, and one side of the contact chamber is communicated with the separation chamber. The bottom of the separation chamber is communicated with a clear water tank through a clear water collecting system. A scum tank is arranged on one side of the separation chamber, and a scum separating plate is arranged between the separation chamber and the scum tank. A scum scraping mechanism is arranged above the scum separating plate and comprises a driving shaft which is rotationally mounted on the tank body through a bearing. The air floatation unit is simple in structure, the separation length is greatly reduced, sufficient dissolved air water exists at the rear end of the separation area, and the effluent quality is improved; the amount of water treated by a single air floatation unit is multiplied; the scum scraping mechanism is arranged on a single side of the separation chamber, scum is gradually taken away, and the separation chamber is prevented from being disturbed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to an adjustable scraper-type sewage treatment air flotation unit. Background technique [0002] In the water supply and drainage process, the solid-liquid separation process and equipment are the key links. The general shape of conventional air flotation is rectangular, and the ratio of length to width is mostly 1:3 or even 1:5. Sewage generally enters the narrow side, separates in the length direction, and finally exits from the narrow end. The main problems of this conventional air flotation are: First, the sewage travels more than ten meters from the water intake to the clear water discharge. In such a long separation space, the bubbles in the dissolved air water almost disappear when they are in the second half of the pool body. If there are no air bubbles in the sewage in the second half of the pool, the suspended solids in the sewage cannot continue to float up, and th...

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Problems solved by technology

[0004] At present, the industrial sewage treatment capacity exceeds 300T / h. In the advanced treatment process, the influent SS is low, the required separation time is less, and the amount of scum is relatively small. Conventional air flotation needs to be equipped with three 100T / h air flotation units. Thereby increasing the cost of sewage treatment and occupying an area

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