SU1157023A1 - Device for purifying liquids - Google Patents

Abstract

1. A DEVICE FOR CLEANING LIQUIDS, comprising a housing with a flotation chamber, a grating and an electrocoagulator mounted on it, a filter, a collection of clarified liquids 6 - I 7 W (D and a foam removal device that differs from functionality and increased convenience of operation, a flotation cell with an electrocoagulator installed along the axis of the hull, and a filter and a collection of clarified liquid between the walls of the hull and the flotation cell, while the device is equipped with flotation chamber with a cylindrical perforated container for the intake of fluid into the electrocoagulator, as well as shelf stoppers that are radially spaced relative to the tank.

Description

2. The device according to claim 1, about tl and which is that the flotation cell is equipped with a removable conical funnel.

3. The device according to claim 1, about t l and one that the cylindrical body of the device is made in the form of detachable sections.

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The invention relates to devices for the flotation treatment of wastewater and can be used in engineering,. oil refining, petrochemical and other industries where it is necessary to purify waste water from oil products, suspended and colloidal substances

A device for flotation sewage treatment is known, comprising a receiving chamber with a damper grate, over which an electrocoagulant is installed, a flotation cell with a suction box, a filter, fittings for supplying and discharging the purified liquid t 1 and 2}.

A disadvantage of the known device is the strict limitation of the amount of suspended solids and oil products, as well as the size of these impurities in liquids subjected to electrocoagulation treatment, due to the contamination of the electrodes and the grinding of the interelectrode space.

In addition, it is difficult and time-consuming to maintain a narrow flotation cell and an electrocoagulator in the device. Thus, to clean the flotation cell from adhering contaminants, it is necessary to remove a heavy metal cylinder with a filter, and to replace the electrode plates of the electrocoagulant it is necessary to dismantle the entire lower part of the wastewater treatment unit.

The purpose of the invention is to expand the functionality and improve the usability of the device, especially when the liquid being cleaned is soiled with coarse impurities.

This goal is achieved by the fact that in a device for purifying liquids, comprising a housing with a flotation chamber, a grating and an electrocoagulator installed on it,

a collection of clarified liquid and a device for removing foam, a flotation cell with an electrocoagulator installed along the axis of the housing, and a filter and a collection of clarified liquid between the walls of the housing and the flotation cell, while the device is provided with a cylindrical perforated under the flotation chamber

capacity for fluid intake into the electrocoagulant, as well as shelf basins placed radially relative to the tank.

On top, the flotation cell is equipped with a removable conical funnel, and the cylindrical body of the device is designed as a detachable section.

Fig, 1 shows a device, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - shelf unit; in fig. A - section BB in FIG. 3

The wastewater treatment device contains a flotation cell 1 formed by a tank 2. In the lower part of the flotation cell, a grid 3 is installed, on which the electrocoagulator 4 is supported. In the bottom part the tank 2 is equipped with a perforated

capacity 5, in the upper part - a pocket 6 for collecting and removing foam. In addition, in the upper part of the tank 2 there are holes 7 bypassing the cleaned fluid for further purification on the filter 8. From the pocket 6, the foam is sucked out of the device through the pipeline 9. The tank 3 is coaxially placed inside the filter 8 formed by the housing 10 with a conical bottom 11. Filter 8 is equipped with a perforated grating 12 on which the filter material 13 is located.

The container 2, the housing 10 and the conical bottom 11 form a chamber 1D for collecting purified water. A liquid pre-clarification chamber 15 is attached to a conical bottom 11 with shelf blocks 16 arranged as maximum in it consisting of a set of shelves 17, and each shelf is made up of two plates — the upper 18 and lower 19 connected along the perimeter. In the upper shelf, slots 20 are made. In the lower part of the shelves, a branch pipe 21 is arranged at the end to discharge sediment. The nozzles 21 of the sediment from the hollow shelves 17 are connected to the pipe 22 lowered into the sediment receiving section of the chamber 15. The chamber 15 is equipped around the perimeter with an inlet pocket 23 having a perforated wall 24 on the side of the shelf units, and an annular pipe 25 of the flow of the liquid to be cleaned . The device for cleaning liquids is also equipped with a nozzle 26 for supplying the cleaned liquid, a nozzle 27 for removing the fine liquid, a nozzle 28 for extracting sludge from the device, a nozzle 29 for withdrawing oil products from the device, a nozzle 30 for introducing reagents, racks 31 for installation on the foundation. On top of the flotation cell, the device is equipped with a removable conical funnel 32. The device for cleaning liquids works as follows. The electrocoagulator 4 is supplied with power from a direct current source. The liquid to be processed through the pipe 26 is fed into the annular pipe 25, which distributes evenly the liquid around the perimeter of the inlet pocket 23, through the slot at the bottom of the ring pipe 25. At the same time, the liquid pressure is extinguished. In order to further stabilize the flow of liquid, the wall 24 of the inlet pocket on the side of the shelf units 16 is perforated. The contaminated liquid, entering further into the shelf blocks 16, is cleaned of coarse impurities and through the perforated container 5 enters the electrocoagulant 4, where it is subjected to electrical treatment. When this occurs, the dissolution of the anodes with the formation of flakes of hydroxide and metal oxides and the release of gas bubbles. After electrocoagulation treatment, the liquid enters the flotation cell 1, where gas bubbles and suspended finely dispersed or colloid-like suspended substances and petroleum products, including flakes of metal hydroxide (sourized) of metals sorbed on them, rise together with the liquid flow. Gas bubbles on the surface of the liquid in the flotation cell form foam, which moves into the pockets 6 and is further removed from the device by suction of air through the pipeline 9. Intensive foaming of water on the surface of the mirror, and hence the formation of a high and stable foam layer is provided by narrowing the flotation chamber 1 in the upper part with a removable conical funnel 32, significantly reducing the water mirror. The liquid purified during flotation through the flooded openings 7 in the tank 2 is fed for purification into the filter 8, where it is filtered through the filtering material 13, made, Hanpi & ep, from spiron, polyurethane foam, silica sand, etc. The purified liquid is collected in the clean collection chamber 14 water, from where the coarse blocks 16 are removed from the device through the pipe 27. Detained in the inter-shelf space of the shelf units 16, they slide along the upper plate 18 of the shelves 17 to the perforated pipe 5. The shelves of the shelf blocks are made hollow, consisting of two conductive plates connected along the perimeter, wherein the upper plate 18 are cut transverse slots 20, the distance between them are increased upwards. The sediment sliding down the shelves through the slots 20 enters the cavity formed by the upper and lower plates 18 and 19, from which it is continuously withdrawn through the pipe 21, arranged in the end between the plates, into the pipe 22 lowered into the sediment receiving chamber 15. From the device, the sediment is discharged through the pipe 28. The arrangement of the shelves 17 using a slot in the upper plate 18 allows the selection of the most optimal slope of the shelves (usually 30-40 to the horizon) in terms of the speed and quality of separation of the two-phase slurry and their length, which will allow maximum retention of coarse impurities of the liquid with the highest performance of thin layer sedimentation. In order to improve the flotation process or to give the treated liquid a neutral reaction, reagents are fed to the device through the nozzle 30. Through the same fitting, gases or an air-saturated contaminated liquid can also be introduced into the device in order to increase the number of gas bubbles in the flotation cell, i.e. improving the flotation process. In the case of the absence of metal for electrode plates, the device can be used for pressure reagent flotation with further purification on the filter, for which air saturated and reagent-treated liquid is supplied to fitting 30. Floating oil particles that float up when trapped in the shelf units 16 rise to the upper part of the liquid pre-clarification chamber 15, from where they come out of the device through fittings 29 The filter is rinsed by a reverse flow of the clarified liquid, i.e. "through pipe 27, Due to the removal of the flotation cell with electrocoagulant inside the filter

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FIG. 2, the process of servicing and operating the flotation cell and the electrocoagulant through the open upper part of the device is greatly simplified, while the narrowed upper part of the flotation cell is removed. The manufacturability of mounting and dismounting the device is ensured by the fact that its cylindrical body is made in the form of detachable sections. Practically with a slight increase in size, the proposed device allows a significant expansion of the qualitative compositional range of liquids entering the purification and provides simple and convenient operation. If a known liquid purifier can receive wastewater contaminated with vented substances and oil products with concentrations up to 150 mg / l, then through the proposed device it will be possible to pass wastewater of almost any concentration on suspended substances and oil ktam concentration up to 500 mg / l. At the same time, the quality of purification of liquids in the known device and offered at the same production capacities will be at the same level.

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FIG.

Claims (3)

1. DEVICE FOR CLEANING LIQUIDS, comprising a housing with a flotation chamber, a grill and an electrocoagulator mounted on it, a filter, a clarified liquid collector and a foam removal device, characterized in that, in order to expand the functionality and improve the usability, the flotation chamber with an electrocoagulator is installed along the axis of the housing, and the filter and the clarified liquid collector are between the walls of the housing and the flotation chamber, while the device is equipped with a qi located under the flotation chamber a cylindrical perforated container for fluid inlet into the electrocoagulator, as well as shelf settlers located radially relative to the tank. FIG. 1 2. The device according to p. ^ Characterized in that the flotation chamber is equipped with a removable conical funnel. 3. The device according to p. ^ Characterized in that the cylindrical body of the device is made in the form of detachable sections.