Impeller air-entrainer air-float device

Abstract

The invention discloses a impeller-air air-flotation device, which comprises: a tank body with closing cap on top, a aeration machine composed of a coupling shaft joint, a hollow disk and a guided blade on disk top cover board and/or its top, a chain-type scum machine, a folded guide-slag plate with front and back parts as tipping plate and middle part as plane plate, and a screw conveyor; wherein, arranging air holes on cover board of guided blade and behind its rotation direction. This invention can get rid of oil and suspended solid in variable water treatment, has high efficiency, needs low energy consumption, and can prevent volatilisation of harmful gas.

Description

technical field [0001] The invention relates to a water treatment device, more specifically to an impeller-induced air flotation device for removing oil and suspended matter in water. Background technique [0002] The working principle of the air flotation device is to use micro-bubbles to absorb pollutants such as oil and suspended solids in the water, and carry the pollutants to the water surface to form scum, so as to achieve the purpose of purifying water quality. According to the generation method of microbubbles in water, air flotation can be divided into pressurized dissolved air flotation, electrolytic air flotation, jet air flotation, impeller air flotation, vacuum air flotation and other technologies. Dissolved air flotation and impeller air flotation are widely used at present, while other technologies are relatively less used. Dissolved air flotation is based on the difference in the solubility of air in water under different pressures. Microbubbles are generate...

AI Technical Summary

Problems solved by technology

The structure of the early impeller air flotation equipment is similar to that of mineral flotation machines, such as WEMCO flotation machines. The problem is that the bottom of the contact area and the separation area are connected to each other, and the water in the pool is in a state of circulating flow, and the scum layer Unstable, continuous slag discharge is required, not only the amount of scum is large, the water content is high, but also the slag scraping equipment greatly agitates the water surface, which affects the water quality of the effluent

The recent impeller air flotation equipment, its tank body is similar to the traditional dissolved air flotation tank, and has certain improvements in structure, such as US5019083, US5242600, and Chinese patents ZL99239458.9, ZL99243522.6, etc. The flotation machine, the aeration area and the separation area are independent of each other, which can form a stable scum layer; in order to prevent the sediment from depositing and the impeller of the aerator from idling, a return pipe is installed at the bottom of the aeration area and the separation area; but the above-mentioned air flotation machine The pool body still has the following common deficiencies: (1) The slag guide plate is a single sloping plate, and the area formed when the slag scraping plate contacts the sloping plate is small, and the scum is easily removed from the scraping slag before the scum scraping plate contacts the sloping plate. The backflow at the bottom of the plate makes it difficult to scrape slag, which affects the water quality of the effluent; (2) The upper part of the pool body is an open structure, and harmful gases are directly volatilized and diffused, polluting the working environment

US1413723, US1413724, US3917763, US3650513, US3066921, US2996287, US1345596, US1726125, US5160459, etc. disclose hollow disk-shaped impellers, and its air distribution holes (or air passages) are located on the periphery of the hollow disk or on the upper and lower cover plates, mainly relying on air The weak centrifugal force generated by itself and the shearing action between the surface of the impeller or its surroundings and the water body introduce air, the air-entraining capacity is small, and it needs to operate at a higher number of revolutions, and has no suction and discharge capacity, and the gas-liquid mixing effect is poor.

The disclosed impellers of US5318360, US3070229, US4193949, US382702, etc. are composed of upper and lower cover plates and guide vanes, etc., and its air distribution holes (or exhaust passages) are located on the upper cover plate and the lower cover of the periphery of the impeller or the outside of the guide vanes. On the board, although the impeller has a good suction and drainage capacity, the air-bleeding capacity is still insufficient

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