an air flotation device

Abstract

The invention relates to a flotation device which is characterized by comprising a box body and a gas dissolved water release system, wherein the box body is sequentially divided into a pretreatment area, a flotation water collecting area and a clear water area; the flotation water collecting area is divided into a flotation area and a water collecting area by a flashing plate; the gas dissolved water release system comprises a first gas dissolved water release pipeline positioned at the bottom of the flotation area and a second gas dissolved water release pipeline positioned in the water collecting area. The flotation device disclosed by the invention has the advantages that in the flotation area, the gas dissolved water released by the first gas dissolved water release pipeline adsorbs tiny particles in sewage, the tiny particles move upwards along with bubbles and float to the liquid surface, a residue scraping machine is used for scraping floating matters into a residue collecting tank, and the water subjected to flotation enters the water collecting area for secondary flotation, then enters the clear water area through a communicating pipe consisting of a water collecting pipe and a water outlet pipe, and then is discharged. The water is subjected to secondary flotation in the water collecting area, the amount of the bubbles of the secondary flotation is greatly reduced compared with that of the primary flotation, so that the energy consumption is basically not increased and the normal water connection can not be influenced while the treatment effect is improved.

Description

technical field [0001] The invention relates to a filtering device, in particular to an air flotation device. Background technique [0002] In sewage treatment, most of the water to be treated is light suspended particles, except for some raw water with more sand and sewage with heavy mechanical impurities. For example: algae in lakes, reservoirs and some rivers; plant residues and fine colloidal impurities; dye particles in the printing and dyeing industry; short fibers in the paper and chemical fiber industries; petroleum and organic solvent droplets in oil refining and chemical industries; Heavy metal ions in pickling wastewater; electrophoretic paint wastewater, etc.; are light particles whose specific gravity is very close to that of water. For these raw water, if the traditional sedimentation method is used, the effect will be very poor, especially in low temperature conditions in winter, due to the deterioration of coagulation and hydraulic conditions, the treatment ...

AI Technical Summary

Problems solved by technology

Among the above two methods, the effect of dissolved air flotation treatment is better, so it is widely used, but there are still some defects: the release pipes of the current dissolved air water release system are all set in a small area near the water inlet. It is impossible to completely float the fine particles in the water, so in the environment with high water treatment requirements, it is necessary to increase post-processing equipment, which increases equipment investment

However, if the release pipes of the dissolved air water release system are evenly distributed in the entire water tank, the energy consumption will be greatly increased, and the normal water collection will be affected.

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