RU2051110C1 - Sewage treatment device - Google Patents

Abstract

FIELD: sewage treatment. SUBSTANCE: device comprises flaking and floatation chambers divided by a partition with ports at the bottom, water-air mixture and sewage mixing chamber, thin-layer units installed at the outlet from the flaking and floatation chambers. EFFECT: device provides for stable cleaning of sewage from oil products and suspended matter. 2 dwg

Description

 The invention relates to the treatment of industrial wastewater and is intended for use in wastewater treatment plants of the petrochemical, chemical, oil refining, metallurgical and other industries.

 Closest to the invention is a device for flotation wastewater treatment, including a supply pipe, flocculation and flotation chambers separated by a partition with windows in the lower part, an aerated water distributor in the form of a pipe with nozzles located in the lower part of the flotation chamber, and nozzles are installed in pairs between windows and directed at an acute angle to their axis.

 However, the structural design of the elements of the aerated water distributor and their mutual arrangement with the waste water supply pipe do not ensure complete mixing of the air-water mixture with the waste water.

 The technical result is to increase the cleaning efficiency due to the complete mixing of the incoming wastewater with reagents and coagulated water with a water-air mixture.

 For this, the device, including the supply pipe, flocculation and flotation chambers, separated by a partition with windows in the lower part, an aerated water distributor in the form of a pipe with holes, a foam collection tray and clarified water and sludge discharge pipes, is provided with an annular hole wall and installed at an angle to each other to each other by two inclined partitions forming a mixing chamber with a perforated wall, and thin-layer blocks located at the outlet of the flocculation chamber.

 Figure 1 schematically shows the proposed device, a longitudinal section; figure 2 is the same, plan view.

The device comprises a supply pipe 1, a flocculation chamber 2, provided with a partition 3 with windows 4 in its lower part, thin-layer blocks 5 located at the outlet of the flocculation chamber 2, aerated water distributor 6 in the form of an annular pipe with holes, an annular hole wall 7 and installed under 30-60 angle to each other ^about two inclined partition walls 8 and 9, forming a perforated wall 7, the mixing chamber 10, the flotation chamber 11, thin-film units 12 placed at the output of the flotation chamber, the chamber 13 of clarified water, foam boric tray 14, lines 15-17 of the clarified water removal, the foam product and a precipitate, respectively, with an upper scraper mechanism scraper 18, the scraper 19 and the lower actuator 20.

 The device operates as follows.

 Wastewater containing a reagent enters at a speed of 1.5-2.0 m / s through a pipe-wire 1 to the upper part of the flocculation chamber 2. When the wastewater moves from top to bottom, a gradual equalization of speeds occurs and conditions are created for optimal (slow) flocculation.

 Next, coagulated water flows from the flocculation chamber 2 towards the mixing chamber 10 through the windows 4 of the partition 3 and enters the space of the aerated water distributor 6 located at the bottom of the mixing chamber 10.

 Additional speed equalization is facilitated by thin-layer blocks 5 located at the outlet of the flocculation chamber.

 Next, the flow of the mixture of coagulated and aerated water through the annular hole wall 7 enters the flotation chamber 11.

 Floatable impurities in the clarified water form floating flotation complexes with water-air bubbles, which in the form of flotopen are continuously raked by the upper scraper 18 to the tray 14 and removed via pipeline 16.

 In the flotation chamber, the general direction of the liquid is ascending-radial, when approaching the thin-layer inclined block 12, the direction changes to the descending-radial one, while this rotation separates larger bubbles that float to the surface of the liquid being cleaned before the thin-layer inclined block 12.

 Blocks 12 provide intensive coalescence and the emergence of air bubbles in the peripheral part of the structure on the surface inclined plates of the blocks, which eliminates the removal of air bubbles in the purified water and increases the cleaning efficiency.

 In blocks 12, precipitation and agglomeration also occurs in the form of a precipitate of the non-floated hydrophilic part of wastewater pollution. Particles of sediment slide from the inclined plates of blocks 12 and are deposited on the bottom of the device.

 The collection of precipitate is carried out using scrapers 19. The clarified water is discharged from the device through the pipeline 15.

 The proposed device provides stable treatment of wastewater from oil products and suspended solids.

Claims (1)

 DEVICE FOR WASTE WATER TREATMENT, including a supply pipe, flocculation and flotation chambers separated by a partition with windows in the lower part, an aerated water distributor in the form of a pipe with holes, a foam collector and clarified water and sludge discharge pipes, characterized in that it is equipped with thin-layer blocks located at the exit of the flocculation chamber, an annular hole wall and mounted at an angle to each other by two inclined partitions, forming a chamber with a hole wall mixing air-water mixture and wastewater.

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