SU1142449A1 - Apparatus for purification of industrial phenol waste water - Google Patents

Abstract

A MACHINE FOR CLEANING PROMOTIONAL PENOL WASTE WATERS, containing a vertical cylindrical body partitioned into mixing and settling sections, mounted along the axis of the housing a rotating shaft with nozzles placed in mixing sections, characterized in that in order to intensify the cleaning process, it is equipped with an additional chamber with placed on a common shaft by a dispersing device made of a casing placed in it by a transporting auger and an annular injector, while the transporting auger is made n conical and its larger base arranged in the annular chamber of the injector nozzle and injector .snabzhen diffuser grids.

Description

This invention relates to the treatment of industrial wastewater by an extraction method. A device is known, which is a sectional extraction column with agitators, containing a vertical cylindrical body, sectioned in height on the settling and mixing sections, a rotating shaft is installed along the axis of the column with agitators mounted on it, placed in the mixing sections. The intensity of the mass transfer process, the residual concentration of phenols in the purified water leaving the extraction column, is in the range of 250-500 mg / l, which does not correspond to sanitary requirements. Hovhan m, pred is emym promshshennoy to purified water. The process of purification of industrial phenolic wastewater from the phenols contained in them has specific features: phenols dissolved in wastewater can be easily oxidized by atmospheric oxygen, as a result of which the process of phenol extraction is difficult and their extraction depth is reduced; ammonia contained in the wastewater increases the pH of the water and binds some of the phenols, preventing the extraction of the latter. The purpose of the invention is to intensify the process of cleaning. The goal is achieved by the fact that in the apparatus for purification of industrial phenolic residual water containing a vertical cylindrical body partitioned in height into the mixing and settling sections, mounted along the axis of the housing a rotating shaft with agitators mounted on it placed in the mixing sections has an additional chamber with placed on a common shaft dispersing device, executed in the form placed in the casing of the transporting screw and the ring injector, and the transporting screw is made in a cone, and its large osiovaniya placed in the chamber of the annular nozzle of the injector, and the injector diffuser is equipped with nets. Figure 1 shows an apparatus for cleaning industrial phenolic waste vedas with process control instruments, a longitudinal section; Fig.2 node T in Fig.1. The apparatus for cleaning industrial phenolic effluent iodine consists of a cylindrical body 1 inside which a rotating shaft 2 is positioned along the axis of the apparatus with agitators 3 mounted on it. The height and height of the apparatus are partitioned by the mixing and settling sections using partitions 4 and 5 with channels 6 and 7 for the flow of light and heavy phases, respectively; coaxial to the shaft in the central part of the apparatus, fixed cylinders 8 and 9 are installed with perforations in areas adjacent to bulkheads 4 and 5. Cylinders 8 and 9 form hydraulic locks 10 and 11 for light and heavy phases. Partitions 4 and 5 and hydraulic locks 10 and 11 form partitioned settling chambers for the contacting phases. In the upper part, the apparatus is provided with an additional camera 12 with a dispersing device placed on the common shaft, made in the form of a transporting screw 14 placed in a casing 13 and an annular injector including a circular nozzle 16 and a casing 13 divided by an annular diffuser 15 in a circular diffuser 15 The screw and collet injector are mounted on shaft 2 by sleeve 18. A mesh 19 is placed in the diffuser. Sealing of the rotating shaft 2 and partitions 4 of chamber 12 is carried out by means of sleeve 20. In addition, in the apparatus e there is a pipe 21, a receiving chamber 22, radial vanes 23, a pipe 24, fittings 25 and 26, a settling section 27, a hydraulic lock 28, a coalescing device 29, a packing 30, a separation section 31, a connecting pipe 32, channels 33, a settling section 34 connecting pipe 35, choke 36, channels 37, choke 38, vacuum lines 39, line 40 for acid gas removal. The device contains control and automation devices: flow meter 41, phenol concentration analyzer 42, correction device 43, signal amplifier 44, controller 45, extractant flow sensor 46, control valve 47, phenolic water flow meter 46, sensor 49, calculating device 50, level sensor 51, signal receiving device 52, signal corrector 53, regulators 54 and 55 of the consumption of phenolic water and acid gases, respectively

Sensors 56 and 57, control valves 58 and 59.

The apparatus for the purification of industrial phenolic wastewater works as follows.

The heavy phase through the pipe 21 is fed into the receiving chamber 22 of the rotating injector nozzle, from where it is thrown into the upper chamber of the nozzle formed by the cap 16 and the partition 17 using radial blades 23, and then under the action of centrifugal force a mixture of droplets and streams of phenolic water is thrown into the diffuser 15 an injector and a mixture of acid gases (hydrogen sulfide and carbon monoxide) coming in through the pipe 24 into the chamber 12 to the gheeter. The resultant emulsion mixture of water and acid gases, intensively interacting with one another, strikes the metal grid as it moves through the diffuser, thereby further crushing the heavy phase (phenolic water) with updating the interfacial surface. When exiting the diffuser, the procontaminated phases are separated. The gas fills the upper part of the chamber, and the liquid - its lower part, from where it is picked up by screw 14 and transported into the lower chamber of the annular nozzle formed by the casing 13 and the partition 17, and then under the action of centrifugal forces, the phase (phenolic water) is discharged into the diffuser by injecting a mixture of acid gases.

Phenolic water, purified from ammonia and oxygen, passes through nozzles 25 and 26 into the lower part of the settling section 27 and further through the hydraulic lock 28 and the mixing section of the column, where the light phase (for example, diisopropyl ether or other extractant) comes from the downstream section of settling. During the rotation of the stirrers 3, a highly developed interfacial surface is created due to the intensive fragmentation of the interacting phases. The mixed phases are discarded to the periphery of the mixing chambers. Having passed the coalescing device 29, made, for example, from metal wire, the heavy phase drops coalesce, then go to the nozzle portion 30, made of a set of radial curvilinear plates. In channels

24494

curved radial

plates, due to the thin laminar flow and the action of centrifugal forces, further phase separation occurs. The separated heavy phase passes through the channels 7 to the separation section 31. Having finally separated, the heavy phase through the hydraulic lock 11 formed by stationary cylinders and pipe 32, flows through the channels 33 to the downstream mixing section. Passing all the contact sections, the separated solid phase enters the spaced section 34, from where it is brought out of the apparatus through the nozzle 35. Easy phase through fittings 36 and 38 enters the lower mixing section. After contacting and passing the coping elements through the channels 6, the light phase enters the separation sections 31. The finally separated light phase through the gidrozatvory 10 formed by the cylinders 9 and nozzles 32, through the channels 37 enters the upstream mixing section. Having passed all stages of contact and separation, the easy phase enters section 27, from where through the nozzle 38 the easy phase is withdrawn from the unit. Due to the presence of partitions 4 and 5 with channels 6 and 7 and hydraulic locks 10 and 11, directional movement of the phases is organized and their separation is good, creating a clear boundary

There are 5 sections in the sections. In the case of stopping the apparatus, in the gravity settling sections there remains a heavy phase tf, therefore, the proposed apparatus is brought to the operating mode very quickly.

To increase the intensity of the pro-. process of phenol recovery from waste

5 water, it is advisable to disperse the heavy phase, for which, when the apparatus is put into operation, after stopping, only the light phase is supplied to the apparatus when the shaft is rotating. Feed in

0 The apparatus of heavy water should be started, and only when the apparatus begins to exit through the shank 38 of the light phase. When the device is started up after it has been opened, for example, repair, inspection, etc., the device is gradually filled with a light phase with the fitting 38 open in order to force the air out of the device. Release to S

Air supply chamber 12 is produced by vacuum line 39.

In the operating mode, the acid gases saturated with ammonia and air oxygen are removed from the apparatus via line 40.

By way of example, FIG. 1 shows an automatic control circuit for the operation of the apparatus for the purification of industrial phenolic wastewater. The yield of purified phenolic water (raffinate) from the apparatus is measured by a flow meter 41, the concentration of phenol in the raffinate is measured by a quality analyzer 42. The output signals from the sensors are sent to the device 43, which calculates the content of phenol in the raffinate, the output of which, having passed through the amplifier 44 of the signal to change the gain, corrects the reference to the regulator 45 of the flow rate partner. The variable of the regulator 45 is the output from the sensor 46 of the extractant flow. The control signal from the regulator 45 is fed to the control valve 47, which changes the amount of the extractant in proportion to the content of phenol in the raffinate.

The flow rate of phenolic water purified from ammonia and oxygen is measured by a flow meter 48, and the concentration of phenol in it is a quality analyzer. The output signals from the sensors are fed to the device 50, which calculates the content of phenol in water.

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coming to the extraction. The amount of ammonia and oxygen removed from water depends on the intensity of the circulation of water in chamber 12, which, in turn, is determined by the level of fluid in the chamber (the degree of immersion of the transporting screw in the fluid). The output signals from the level sensor 51 and the device 50 are fed to the device 52, the output of which passes through the equalizer 53 to change the gain, corrects the setting by the flow controller 54 and 55

phenolic water and acid gases. Variables 54 and 55 are output from sensors 56 and 57 of water and acid gases, respectively. Control signals from regulators 54 and 55 are applied to control valves 58 and 59, which change the amount of acid gases, and the amount of phenolic water - back

| Proportionally to the content of phenol in the water entering the extraction.

If it is necessary to clean the light phase, similarly to chamber 12, a chamber can be installed in the lower part

apparatus ..

The use of the proposed apparatus for the purification of industrial phenolic wastewater will achieve a recovery rate of 95-97%. - © --L 1M Figure 1 wr pump

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Claims (1)

APPARATUS FOR CLEANING INDUSTRIAL PHENOLIC WASTE WATERS, comprising a vertical cylindrical body partitioned into mixing and settling sections, a rotating shaft mounted along the axis of the housing with stirrers placed in the mixing sections, characterized in that, in order to intensify the cleaning process, it is equipped with an additional chamber with a dispersing device placed on a common shaft made of a casing, a conveying screw and an annular injector disposed therein, while the conveying screw is made of horses and its larger base is placed in the chamber of the annular nozzle of the injector, and the diffuser of the injector is equipped with grids. I 1142449 2