SU1291547A1 - Arrangement for flotation treatment of waste water - Google Patents

Abstract

The invention relates to devices for the flotation treatment of wastewater from petrochemical, chemical and petroleum refineries from oil products contained in them, mechanical, pollution in part of colloidal substances. The aim of the invention is to increase the effect of wastewater treatment by improving the mixing conditions of coagulated and aerated water. The device includes a housing, a flocculation chamber, a flotation chamber with a displacement chamber, a dividing partition with windows in its lower part, a perforated partition that separates the mixing chamber in the flotation chamber, an aerated water distributor in the form of an annular pipeline with counter-directional walls, an annular partition, a scraper mechanism with an upper scraper, a lower scraper, a motor and a rotating truss; a tray for collecting foam and a scoop for collecting sludge. 3 il. § (L

Description

The invention relates to devices for flotation treatment of wastewater from petrochemical, chemical, oil refining plants and other enterprises from oil products, mechanical impurities and part of colloidal organic substances.

The purpose of the invention is to increase the effect of water purification due to the improved mixing conditions of coagulated and aerated water.

Figure 1 shows the device, a longitudinal section; figure 2 - node I in figure 1; on fig.Z - section aa in figure 2.

The device comprises a housing 1 with chambers 2 and 3 flocculation and flotation. In the flotation chamber, a mixing chamber 4 is formed by a dividing partition 5 with overflow windows 6 in its lower part and a perforated partition 7 with a visor 8, the free edge of which is located at a distance from the partition 5 and forms a slotted gap 9. A distributor of aerated water is installed along the dividing partition perimeter. in the form of an annular pipe 10 with oppositely directed nozzles 11, with this, the distributor of aerated water is located below the level of the bypass windows 6. In addition, the device has rings The dividing wall 12, the scraper mechanism with the upper 13 and lower 14 scrapers, the motor 15 and the rotating farm 16, the foam collecting tray 17 and the sludge collecting 18 for collecting sludge. In the flocculation chamber, the agitator 19 is installed with the actuator 20 and the original pipeline 21 is inserted into it. water.

The device works as follows.

: Sewage water containing the reagent flows at a speed of 1.5-2.0 m / s through the tangential supply pipeline 21 to the lower part of the double-mode flocculation chamber 2. The mixer 19, the lower ends of the blades of which are located above the opening for the intake of waste water, rotates towards the direction of the circular flow, as a result of which in the first regime zone a mode of permeation of the fluid with increased intensity is created. When moving wastewater from the bottom up, there is a gradual

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leveling of the velocity field, in the second regime zone, conditions are created for optimal flocculation with a low mixing intensity.

The design of the bimodal flocculation chamber with a gradual decrease in the intensity of mixing of the liquid ensures high efficiency of the reagent treatment process regardless of the change in the wastewater flow rate, makes it possible, if necessary, to vary within wide limits the mode of mixing and flocculation in the same structure with a change in the quality of the initial wastewater.

The coagulated water flows into the upper part of the mixing chamber 4 through the overflow cavity and rectangular windows 6 located above the level of the aerated water distributor.

The release of aerated water through counter-directed nozzles II installed on the annular conduit 10 is carried out in the lower part of the mixing chamber 4. At the same time, in order to reduce the formation of large air bubbles and to create the maximum number of small bubbles, the release of aerated water from the nozzles is performed at an optimum speed of at least 6-8 m / s. The quenching of the discharged jets and the decrease in the flow rate of aerated water occurs in the lower part of the mixing zone, while the partition 7 prevents breakthrough of aerated water into the purified water when possible under industrial conditions is not enough: accurate installation of nozzles.

The formed individual large air bubbles are separated from the main stream of aerated water due to their significant lifting force and hydraulic resistance of the perforated part of the partition 7, pass through the slit gap 9 in this partition and float upward along the partition 5 separating flocculation and flotation. This removes large air bubbles from the main flotation zone, which eliminates their negative impact on the flotation process.

The coagulated and aerated WATER mixture occurs in the upper

parts of the mixing chamber, moreover, due to the flow of coagulated and aerated water that occurs in the volume of the mixing chamber, provides a longer and more efficient contact of air bubbles with flakes of contamination and, as a result, the formation of strong puff-particle aggregates. The mixed stream of coagulated and aerated water passes through the perforated part of the partition 7 into the flotation zone in the radial-vertical direction. Due to the ring partition 12, the upper edge of which is located above the liquid level increases with the duration of the flotation. The valuable product released on the surface of the liquid in the flotation cell is continuously scooped by the top box 13 to the tray 17, and the sediment falling to the bottom is scooped up by the bottom scraper 14 for 18.

The proposed device provides a stable wastewater treatment from petroleum products and suspended

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substances with an average efficiency up to 85%.

Claims (1)

Invention Formula A device for flotation sewage treatment, comprising a housing with flocculation and flotation chambers, a dividing partition with overflow windows in the Bottom part for discharging coagulated water, a distributor of aerated water with pair-mounted nozzles located around the perimeter of the partition, in order to increase effect of water purification due to improved mixing conditions of coagulated and aerated water; it is equipped with a perforated partition installed in the flotation chamber with a trump the chamber forming a mixing chamber with the dividing partition, wherein the aerated water distributor is located below the level of the bypass windows, and the free edge of the visor is located at a distance from the dividing partition. Fig.Z FIG. 2 Editor N. Gunko Compiled by L. Sukhanova Tehred L. Kravchuk Order 200/26 Circulation B52 Subscription VNIIPI USSR State Committee on affairs of inventions: discoveries and 113035, Moscow, Zh-35, Raushsk nab., d.4 / 5 ".". ...... i --.-- -, .. - -. "-" ..-,., .., ". Production and printing company, Uzhgorod, Projecto st., 4 Corrector. M.Samborska