High efficiency circulating injection dissolved-air air-float method and apparatus

Abstract

The invention has supplied a high effective circumfluence spraying flotation method and its device, which includes spraying air by sprayer on circumfluence pipe-line of water stressing pipe and water absorbing pipe, absorb air to cut and resolve it into water by absorbing and mixing effects, then after agtating and mixing of water pump to resolve the air further more, which is sent to the air-releasing system to be released. Since the air-dissolving pipe in circumfluence pipe-line has increased the time of gas-liquid transmission, it is assured that the air absorbed can be dissolved into water completely, and the air-dissolving pipe is much smaller that the conventional, about one tenth of it. The method can make use of the pressure difference between water-stressing pipe and water-absorbing pipe, only little energy from water pump is needed. The device has simple structure, saves energy, has high efficiency of dissolvement, rapid start-up of system, stale operation and is easy to be controlled and operated.

Description

technical field [0001] The invention relates to a novel dissolved air flotation method and device, in particular to a high-efficiency circulation ejection dissolved air flotation method and a device for realizing the method. Background technique [0002] Air flotation is a technique for solid-liquid or liquid-liquid separation. It generates a large number of microbubbles in a certain way, making them adhere to solid or liquid impurity particles with a density close to that of water, forming a floating body with a density lower than that of water, which floats up to the water surface under the action of buoyancy to form scum. Solid-liquid or liquid-liquid separation. [0003] As a unique water treatment technology, air flotation separation technology is very effective for separating oils, fibers, suspended solids, algae, activated sludge or biofilms whose specific gravity is similar to that of water. The particles removed by the air flotation method are mainly divided into ...

AI Technical Summary

Problems solved by technology

However, in the process of experiment and practical application, it is found that the method and device have certain deficiencies, which are manifested in: due to the short gas-liquid mass transfer time, the amount of real dissolved air in the pressure-dissolved air water is limited, and the requirements are relatively high. The reflux ratio (25-40%) can achieve better purification effect

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