SU1474095A1 - Thin-film flotator-settler - Google Patents

Abstract

The invention relates to devices for the separation of fine suspensions or two immiscible liquids under the action of gravitational forces using a flotation process, can be used in the chemical, petrochemical and other industries, and makes it possible to increase the efficiency of separation of fine suspensions. The thin bed settler-flotator includes a housing, a separation chamber formed by inclined flat or wavy shelves. Along the entire length of the upper precipitation surfaces of the shelves are perforated gas pipelines. The initial slurry is fed into the housing through the feed pipe, and the gas through the pipelines. Small gas bubbles over the entire surface of the settling shelves bubble the processable mixture, capture the small liquid and solid inclusions and facilitate their release into the areas under the shelves and then through the pockets are removed from the apparatus. 1 hp f-ly, 5 ill.

Description

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The invention relates to devices for separating fine suspensions or two immiscible liquids under the action of gravitational forces using a flotation process, which is associated with air bubbling, and can be used in the chemical, petrochemical and other industries.

The purpose of the invention is to increase the separation efficiency by increasing the degree and volume of gas contacting with the medium.

Figure 1 shows the sump-flotator, General view; figure 2 - section

A-A in FIG., 1; on fig.Z - section BB in figure 1; Fig. 4 shows a section B-B in Fig. 3 (in the case of making the shelf shelves flat); figure 5 is the same, the precipitation shelves are made wavy.

The thin-layer inclined settling tank - the flotation cell comprises a housing 1, a separation chamber 2 formed by inclined flat or wavy shelves 3, a heavy component collection chamber 4 and a light component collector 5. For removal of the heavy component is the pipe 6, and for removal of the light component and air - the pipe 7.

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To supply the initial mixture of components, a pipe 8 with side openings 9 is used, which enters the collection sideways. The inclined shelves 3 in the upper part are provided with suction peaks 10 for removing the light component. To eliminate mixing of the light component and the initial mixture, at least two through pockets 11 are installed in the collector 5, between which the feed pipe 8 is installed, with the outlets of the pockets 11 located above the pipe 8.

When cleaning the sewage simultaneously from floating oils, fats and sinking solid particles in the lower part of the body, in the areas under the shelves 3 there are made suction peaks 12 with pipes 1 in which there are 14 holes for uniform water drainage. The pipes 13 are discharged into collecting collectors 15. For discharging the purified water from the collector 15, pipes 16 are used.

To increase the separation efficiency, the settling tank is equipped with a perforated collector gas distribution system. The collector system consists of a gas supply nozzle 17, which enters laterally into the housing 1, a tee 18 and gas distribution pipes 19 and gas pipelines 20 fixed to the upper settling surfaces of the shelves 3 along their entire length. Pipelines 20 are made of tubes cut in half and provided with radial holes 21. Holes 21 from top to bottom of pipelines 20 can be made with decreasing diameter to ensure uniform flow of gas. As a gaseous medium, air or another gas that is neutral with respect to separable mixture.

When the shelves 3 are made, they are not flat, but an undulating form in the form of sinusoids, in the cavities they make the walls double, i.e pockets 24 are formed between the upper 22 and lower 23 walls, which play the role of gas conduits 20. Pockets 24 are connected by gas distribution pipes 19, and in the upper walls 22 there are a series of holes 25 similar to the openings 21 with a flat shelf shape 3.

The efficiency of cleaning (separation) with a wavy shape of the shelves is higher, 1 than with a flat shape of the shelves, by reducing the thickness of the bubbler

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layers of light and heavy components, which is unattainable in practice, with a flat shelf shape.

Wavy shelves, 3 it is advisable to make the method of injection molding of plastics. This is due to the fact that in the hollows of the shelves must be double-walled with internal pockets for gas.

The sump when releasing from the wastewater of floating oils or fats and sinking mechanical fine particles works as follows.

Before the separation of the mixture and filling the apparatus through the collector system under the required pressure serves the gas. Then begin filling the apparatus with the initial mixture. At steady state, the mixture subjected to separation is fed through pipe 8 and enters the cavity of collector 5 of the light component through openings 9. The feed mixture, bending through the pockets 11 from their outer side, is evenly distributed between the shelves 3 in the separation chamber 2. The largest drops oils and fats due to the ejection forces are released directly in the upper part of the collector 5. Fine-dispersed inclusions remaining in the treated waste water enter the inter-shelf space, where through a perforated stake A gas system is fed through gas lines 20 to carry out the flotation process. Small gas bubbles along the entire length of the precipitation shelves 3, by bubbling into the processed mixture through the openings 21 of the gas pipelines 20, capture the small liquid and solid inclusions and contribute to their more intensive release into the zones under the shelves 3. Floatable floats-. The small solid and liquid inclusions in the under-shelf zones, cut off in the upper part of the separation chamber 2 with peaks 10, enter the pockets 11. From the pockets 11 without mixing with the initial flow, they are ". enter directly into the upper part of chamber 5, and then through branch pipe 7 with a guaranteed accumulation are discharged to its intended purpose, previously combined with the largest pop-up particles before removal. Large non-floated solids, settling on the upper surfaces of the shelves 3, due to the force of gravity, slide off them and enter the chamber 4 of the collection of the heavy component. As the solid particles accumulate in the chamber 4, they are removed from the apparatus through the nozzle 6. The treated wastewater is collected by the suction peaks 12, is discharged through the holes 14 into the pipes 13 and is discharged through the pipes 16. Air is vented through pipe 7.

In the case of the presence in the treated wastewater only pop-up oils and fats without solid sinking particles of the installation of peaks 12, pipes 13 and collector 15 is not required. In this case, the water being cleaned through the water seal can be discharged from the apparatus through the nozzle 6 or through the upper part of the chamber 4 also with the water seal. Thus, due to the significant number of gas pipelines, after the gas outflows from the holes in them, a high degree of gas contact with gas is created.

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the treated medium, thereby increasing the efficiency of the separation.

Claims (2)

1. A thin layer settler-flotation cell, including a body with installed sloping shelves, an air distributor, collections of heavy and light components, pipes for supplying and discharging clarified water and discharging thickened sludge, characterized in that, in order to increase the separation efficiency, it is supplied with gas pipelines connected to the air distributor, located along the upper surface of the settling shelves. 2. A settling flotation vessel according to claim 1, characterized in that the precipitation shelves are made wavy, while the gas pipelines are located in the hollows of the shelves. Fig t Fi & .g 1474095 BB 20 L III HI aTl Fmg.5 Bb wwV / 27 L Fial / 7 And ilfi Bl g / Ј7 6-6  22 25 / l 23 2 hch FIG. five