Rotary fine screen for water treatment and application of rotary fine screen to water treatment

Abstract

The invention discloses an improved rotary fine screen for filtration of water treatment. The rotary fine screen is characterized in that: a rotary annular filter screen is formed by hinging triangular hopper-shaped porous filter plates, wherein each triangular hopper-shaped porous filter plate has an open edge, and is annularly arranged on a frame in a way that triangular openings are inward; a slag collection and discharge device comprises a slag collection hopper and a lower conveying and slag discharge device, and is arranged in the rotary annular filter screen; and a thickness surface on one side of the screen is closed and a thickness surface on the other side of the screen is open. The filtering area of a single filtering surface at least can be increased by 10 to 20 percent compared with that of a single filtering surface of a planar filter screen; and moreover, two surfaces of the rotary screen have a filtration interception effect, and the filtering area is at least increased by 120 to 140 percent. The filtration mode that sewage flows from inside to outside also ensures that intercepted dirt and filtration effluent are completely separated, so that the intercepted dirt cannot be brought into the downstream of the effluent along with the rotation of the filtering surfaces of the screen. Particularly, the open thickness surface is arranged toward the water flow, so that the filtration flux is not affected by the width of a canal, the rotary fine screen can still be put into the original canal after the width is increased, the dependence on the width of the canal is greatly reduced, and the floor area of the canal is saved; and the rotary fine screen is particularly applicable to the transformation of old sewage treatment plants.

Description

technical field [0001] The present invention is an improvement on the rotary fine grid for water treatment and filtration, especially relates to a rotary fine grid for water treatment with the same filter area, large effective filtration area and large filtration flux, and the filtration flux can not be limited by the width of the filter ditch Grid and its application in water treatment. Background technique [0002] The rotary grille is an important solid-liquid separation equipment in the water treatment process, especially the fine grille is used to separate and remove some impurities that cannot be effectively removed by sedimentation, such as fiber, hair and other silk, thread and other fine particle impurities. It plays an irreplaceable role in the treatment process, such as the effluent of the secondary sedimentation tank for sewage treatment, and the ultra-fine filtration before entering the membrane treatment. Prior art revolving grids, such as Chinese patents CN22...

AI Technical Summary

Problems solved by technology

The main disadvantage of this rotary grille is: the filter surface is flat, and the filter surface is facing the water to filter, it can only be filtered on one side, and the effective filtering area is the largest and less than half of the rotary filter screen (the maximum area of ​​the single side placed under water); When the mesh surface faces the water, the filtration flux can only be achieved by increasing the width of the filter mesh, but the width of the filtration surface is also limited by the width of the canal, that is, the filtration flux is also limited by the width of the filtration ditch. To increase the filtration flux, the width of the canal must be increased , resulting in an increase in civil construction costs and land occupation, especially in some old sewage plants, the width of the outlet channel of the secondary sedimentation tank is fixed and relatively narrow, which is difficult to increase, which is not conducive to the transformation of existing water treatment facilities; Intercepting dirt, the trapped dirt (especially fiber, hair and other silk and thread impurities) is easy to adhere to the filter mesh surface of the grille under the action of water pressure, and will not only be brought to the downstream water body of the filter with the 360° rotation of the grille, but also enter Subsequent sewage treatment process, or blockage of subsequent process treatment equipment, or discharge with tail water, reduce the treatment effect, and it is difficult to remove the attached mesh surface by washing with water. Long-term accumulation of adhesion will cause filter blockage and decrease filtration flux , the project is very nerve-wracking

However, due to the cylindrical filter structure and inclined installation, the effective filter area of ​​the filter ditch with the same width is greatly reduced compared with the rotary grille, so the filter flux is more dependent on the channel width, and the same filter capacity requires a wider filter Ditch and larger-diameter drum grills; in addition, the inclined installation of drum grills requires high-strength bearing support, which requires high equipment installation, operation and maintenance

[0004] In the prior art, the above two types of rotary grille filter devices have common disadvantages. They can only filter one side of the submerged water, and the filtration flux is limited by the width of the filter ditch. These two inherent shortcomings have not been effectively solved for a long time, restricting Efficient Application of Rotary Grille

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