SU1116015A1 - Arrangement for flotation cleaning of waste water - Google Patents

Abstract

A device for flotation purification of waste water, including a supply pipeline, flocculation and flotation chambers, separated by a partition with windows in the lower part, aerated water distributor in the form of a pipeline with nozzles, in order to increase the cleaning efficiency the lower part of the flotation chamber along the perimeter of the partition separating the flotation cells and flocculation, and the nozzles are installed in pairs between the windows and directed at an acute angle to their axis. (L

Description

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ABOUT

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iput.l The invention relates to devices for flotation treatment of wastewater from petrochemical, chemical and oil refineries from oil products, mechanical contaminants and part of colloidal organic substances. A device is known, including the hydraulic chamber of a whirlpool type flocculating unit combined with a series of horizontal rectangular flotation cells divided by partitions, forming overflow cavities in which pipelines are installed for supplying aerated water and mixing it with waste water. In the course of such mixing, evolved air bubbles are fixed on the flakes of contaminants. In flotation cells, pollution particles are transported with air bubbles onto the liquid surface with the formation of a foam layer C13. The disadvantage of such devices, due to the use of flooding chambers of the hydraulic type, is the dependence of the intensity (mode) and the efficiency of mixing and flocculation on the wastewater flow rate, the inability to control these processes when changing the initial parameters of the wastewater. In addition, offset. water from aerated in these devices is produced when the latter is discharged from a perforated pipeline, which does not provide the necessary degree of mixing due to the limited contact surface of aerated water with waste water. In the known devices, aerated water leaves the holes of the perforated pipeline in the form of a circular jet, its contact surface with the waste water is limited to the external surface of the jet, which does not provide the necessary degree of mixing. The closest to the invention to the technical essence and the achieved result is a device for flotation purification of STOCHNELCH water, including pit pipeline, flocculation and flotation chambers separated by a partition with windows in the lower part, a distributor of aerated water in the form of a pipe with nozzles 21. In a known device the vertical arrangement of the elements of the aerated water distributor leads to the fact that when the air bubbles from the lower elements float up, they coalesce with the bubbles Air from the upper element distribution divider, thereby forming large air bubbles which adversely affect the hydraulic flotation mode. The aim of the invention is to increase the cleaning efficiency. The target is achieved by the fact that in a flotation unit for sewage treatment, including a supply pipeline, flocculation and flotation chambers, separated by a partition with windows in the lower part, a distributor of aerated water in the form of a pipeline with nozzles, a distributor of aerated water located in the lower part of the flotation chamber along the perimeter of the partition, the section towards the flotation chamber and flocculation chamber, and the nozzles are installed in pairs between the windows and directed at an acute angle to their axis. FIG. 1 shows the proposed device, a longitudinal section; on . FIG. 2 — node 1 in FIG. one; in FIG. The node in FIG. 2; in fig. 4 shows section A-A in FIG. 2. The device contains a tangential pitka pipe 1, the camera. 2 flocculations and 3 flotations, separated by a partition 4 with windows 5 in its lower part, a stirrer 6 with an engine 7, an aerated water distributor in the form of a pipeline 8 with nozzles 9, an annular partition 10, a scraper mechanism with an upper scraper 11, a lower scraper 12 and a drive 13, a tray 14 for collecting foam and for a scoop 15 for collecting sediment. The nozzles 9 are installed in pairs on the pipeline 8. for the supply of aerated water. Between the windows 5. exit. coa-t holed water in flotation. camera .3..The drive of the scraper mechanism contains a pipe 16, a leading roller. 17 and an electric motor 18. The use of a mechanical flocculation chamber ensures the efficiency of the reagent treatment process, regardless of the change in the discharge water flow rate, the possibility of varying the blending and flocculation mode in the same structure, if necessary, with a change in the quality of the original wastewater. The device works as follows. The wastewater containing the reagent flows at a speed of 1.5-2.0 m / s through conduit 1 to the lower part of the flocculation chamber 2. The stirrer b, the lower ends of the blades of which are located above the sewage inlet, rotates in the opposite direction to the circular flow, due to which, in the first regime, the mixing mode of waste water with an increased velocity gradient is created. With the movement of wastewater from the bottom up, a gradual alignment of the velocity field occurs, in the second regime zone conditions are created for optimal (slow) flocculation. The coagulation water flows to the flotation cell 3 through the overflow cavity, the coagulated water exits from it through rectangular windows 5, along which nozzles 9 directed opposite to each other are located. The opposite direction of the Nozzles allows to obtain air bubbles of minimal dimensions due to the diverging flare, as well as the most complete effective mixing with flocculent impurities during the passage of coagulated water through the aerated water inlet zone.

The mixture of coagulated and aerated water moves vertically; a radial direction in a flotation cell equipped with an annular partition 10 for increasing the duration of flotation, the upper edge of which is located above the liquid level in the flotation cell.

The foam product is continuously scooped by the upper scraper 11 to the tray 14, and the sediment that fell to the bottom of the flotation cell is scooped up by the lower scraper 12 at 1.515 cm to collect the sludge.

According to the test data, the proposed device provides a stable treatment of waste water from petroleum products and suspended solids with extraction efficiency. pollution up to 80%.

Claims (1)

DEVICE FOR FLOTATION WASTE WATER CLEANING, 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, characterized in that, in order to improve cleaning efficiency, distribute aerated water the lower part of the flotation chamber along the perimeter of the partition separating the flotation and flocculation chambers, and the nozzles are installed in pairs between the windows and are directed at an acute angle to their axis. SU L116015