RU2495831C2 - Three-section contact tank for ozone water treatment - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to equipment for treating water by ozonation and can be used particularly in decontaminating drinking water in water supply systems of cities and population centres and disinfecting recycled pool water. The three-section contact tank has three sealed reaction vessels connected to each other. Between the second and third sections there is an additional inter-section by-pass compartment with a partition wall in the middle, in the bottom part of which there is a through-channel. Each section of the contact tank is further equipped with perforated pipes which are plugged at one end. One group of said pies is mounted on top below the water level in the section, and the other group is mounted at the bottom of the section under ozone-air mixture dispersers. Open ends of the pipes mounted on top at the water level of the first section are linked with a pressure compartment. Open ends of the bottom pipes in the first section are mated with bottom pipes of the second section. Open ends of pipes mounted below the water level of the first and third sections are linked with cavities of the inter-section by-pass compartment. Open ends of the bottom pipes of the third section are linked with a drainage compartment.

EFFECT: high quality of drinking water and efficiency of using the produced ozone.

7 cl, 5 dwg

Description

The invention relates to techniques for treating water with ozonation and can be used, in particular, for the disinfection of drinking water in the water supply systems of cities and towns, for the disinfection of recycled water pools.

The prior art installation for ozonation of water, containing an air preparation system connected to an ozone generator, an electric power source, a reaction vessel in the form of a contact reservoir divided into separate sections by vertical transverse partitions, alternately adjacent to the bottom of the contact reservoir and partitions installed with a gap relative to bottom, providing sequential flow of water from section to section from the entrance to the contact reservoir to the exit from it, in the lower part of each sections installed dispersants of the ozone-air mixture in communication with the ozone generator, a residual ozone destruction system, a wave generator or a device for exciting shock waves, located in the lower part of the contact reservoir section, which can be combined into separate container-type modules (RF Patent No. 2169122, C02F 1/78, publ. 2001).

The disadvantages of the known installation include the fact that the direction of movement of water in the sections does not occur parallel to the walls, but diagonally, which is due to the design of intersectional partitions (Figure 1), while the initial direction of movement of the bubbles of the ozone-air mixture from the bottom up.

As a result of this, in each section of the contact reservoir two angular stagnant zones are formed with circular circulation of water and ozone-air mixture bubbles.

In stagnant zones, the concentration of ozone dissolved in it increases, as a result of which in these places the output of ozone from the bubbles of the ozone-air mixture slows down, and the concentration of residual ozone in the gas cushion of the section increases.

In addition, when the direction of the flow of water diagonally decreases the cross-sectional area of the core of the stream and decreases the residence time of water in the reaction zone of the section.

A prior art installation for water ozonation is also known, comprising a compressor, the output of which is connected to an air preparation system connected to the input of the ozone generation unit, to the output of which are connected the inputs of the bubble-forming dispersed ozone-air mixture located in the lower part of the contact pool, which is divided into N sections using N-1 transverse vertical partitions, with partitions with an even serial number adjacent to the bottom of the pool, transverse vertical partitions with an odd order your number has a height greater than the water level in the contact pool, the water inlet is located in the upper part of the first section, and the water outlet in the last section, characterized in that the transverse vertical partitions with an even serial number have a height greater than the water level in the contact pool, partitions with an odd serial number are adjacent to the bottom of the pool, in the upper part of the sections with numbers n> 1 there are additional water inlets, the water outlet is connected with additional water outlets located in the lower part of the sections numbered n = 1, ..., N-1 (RF Patent №2214369, C02F 1/78, publ. 2003).

This installation has the same drawback as the installation according to the patent of the Russian Federation No. 2169122. The water in the sections also moves diagonally, only the direction of water movement in the sections is reversed in comparison with the installation of the aforementioned patent (see Figure 2).

The closest analogue of the invention, taken as a prototype, is an installation for ozonation of water, including an air pretreatment system, a power source, an ozone generator in communication with dispersants of the ozone-air mixture installed in the bottom part of the contact reservoir section, a water supply system in communication with the source the treated water, a discharge pipe for purified water and a system for the sequential flow of the treated water from the section to the section containing intersection fume DKI alternately adjacent to the bottom of the contact tank and partitions installed with gaps relative to the bottom (RF patent №2207985, C02F 1/78, publ. 2007).

The disadvantages of this installation include the fact that the water flow in the sections of the contact tank moves diagonally, and the initial flow of the ozone-air mixture has a vertical direction from bottom to top, resulting in angular stagnant zones with local circular circulation of water with ozone dissolved in it, which leads to an uneven distribution of water flow over the cross section of each section of the contact tank. For this reason, the estimated time spent in the ozone treatment zone for the diagonal flow of water is reduced, and for the circulating part of the water it is increased, which reduces the degree of water purification as a whole.

The objective of the proposed technical solution is to provide a given movement of the water flow in each section of the contact reservoir (countercurrent of water and ozone-air mixture in the first and third sections, the satellite stream in the second section), with the sequential flow of water from section to section, and its uniform distribution the cross section of each section of the contact tank.

The solution to this problem is achieved by the fact that in a three-section contact tank for treating water with ozone, including: three sealed reaction vessels interconnected, preferably made of concrete, each in the form of a parallelepiped, located between the pressure compartment connected to the source of the treated water and the drain compartment, having a tap for supplying water to the consumer, and also equipped with a system for supplying an ozone-air mixture to each reaction section and dispersing it into water, a drainage system, and The residual ozone structure in the ozone-air mixture additionally between the second - 2 and third - 3 sections (see Figure 3) has an intersection bypass compartment - 6 with a partition in the middle - 7, in the lower part of which there is a through channel - 19, and each section the contact tank is additionally equipped with perforated pipes plugged from one end, one group of them is installed at the top below the water horizon in the section - 8, 9, 10, and the other group - 11, 12, 13 is installed at the bottom of the section below the dispersants of the ozone-air mixture - 16, 17, 18, with this, the open ends of the pipes installed at the top of the water horizon of the first section - 1, are in communication with the pressure compartment - 4, and the open ends of the bottom pipes of the first section - 11 are docked with the bottom pipes of the second section - 12, the open ends of the pipes - 9 and 10, installed under the water level of the second and third sections - 2, 3, communicated with the cavities of the intersectional bypass compartment - 6, and the open ends of the bottom pipes - 13 of the third section - 3 communicated with the drain compartment - 5.

Intersectional bypass compartment - 6 with a partition in the middle - 7, made of two parallel walls spaced from each other at a distance of 0.8 ... 1.4 m, above the water level in the sections - 2 and 3.

The perforation holes in the pipes - 8, 10, 11, 12, 13 for water passage were selected with a diameter of 20 ... 25 mm, and the total area of holes in the pipes of individual sections installed under the water horizon - 8, 9, 10 and at the bottom of the sections - 11 , 12, 13, is equal to 0.01 ... 0.02 of the cross-sectional area of the tank section.

At each level in each group of pipes, their axes are mounted parallel to each other and placed in increments of 17 to 25% of the immersion depth of the dispersants in the section.

Installed in the upper part of section - 2, perforated pipes - 9 plugged at one end (see Figure 3), can be made with one longitudinal row of rectangular windows - 2 (see Figure 5) on each side with a ratio of window heights to a width of 2: 1, and the total width of the windows in one row is equal to half the working length of the pipe, while in the area of the windows the pipe surface is made flat, and each row of windows is equipped with an overhead rail with a rectilinear upper working edge with the possibility of installing the working edge parallel to and below water level in sections at a given depth with equal costs through a single window.

The implementation of perforated pipes for distributing the treated water between the sections of the contact tank with overlays on rectangular holes regulating the thickness of the water layer over the overflow edge increases the uniformity of the distribution of water flows over the cross section of the contact tank section and, ultimately, increases the efficiency of the water ozonation process.

In the bottom part of each section of the contact reservoir below the dispersants of the ozone-air mixture, instead of bottom perforated pipes 11, 12, 13 (see Figure 3), horizontal perforated partitions 20, 21, 22 (see Figure 4) with a diameter of holes 20 ... 25 mm, and the total area of the holes in the partitions is 0.01 ... 0.02 cross-sectional area of the section, and in the walls of the first and third sections are made through channels - 23, 24, located below the horizontal perforated partitions.

Three-section contact tank is illustrated by drawings. Figure 1 shows a diagram of changing the direction of the flow of water to the opposite when it flows from section to section and the flow of water in each section in a three-section contact tank, adopted as a prototype. Arrows indicate the direction of water movement.

Figure 2 shows a diagram of changing the direction of the flow of water to the opposite when it flows from section to section and the flow of water in each section in a three-section contact tank with an additional water inlet according to the patent of Russian Federation No. 2214369.

Figure 3 shows a structural diagram of the proposed three-section contact tank, where the numbers denote: 1, 2, 3 - sections of the contact tank, 4 - pressure compartment, 5 - drain compartment, 6 - bypass intersection compartment, 7 - partition in the intersection bypass compartment, 8, 9, 10 - perforated pipes of the upper level, 11, 12, 13 - perforated bottom pipes, 14 - inlet for water supply, 15 - outlet for draining water, 16, 17, 18 - dispersers of ozone-inflated mixture, 19 - a through channel in the partition for the passage of water into the bypass th compartment. The hollow arrows show the direction of flow of the ozone-air mixture, and the simple arrows show the direction of water movement.

Figure 4 shows a structural diagram of the proposed three-section contact tank, in which instead of bottom perforated pipes are installed horizontal perforated partitions - 20, 21, 22, which are identical in function and additional through channels - 23 and 24, located below the perforated partition for water passage .

Figure 5 shows a structural diagram of the installation of the control rails - 26 on the perforated pipes - 9. Perforated pipes - 9, installed in the upper part of the second section of the contact tank, which receive water inside through holes in the side walls and drain it through the open end, made partially flat side walls, in the upper part of which rectangular holes are made at equal distance from each other along the length of the pipe - 25, the total width of which is equal to half the working length of the pipe, and they are equipped with overhead slats - 26, with rectilinear upper edges mounted on both sides on the side walls with the possibility of changing the vertical position of its upper edge relative to the water horizon in the contact tank and the angle of inclination to ensure the required height of the water layer above the edges in each hole and equal flow through each hole .

The claimed three-section contact tank operates as follows: under pressure in the pressure compartment - 4 (see Figure 3), water is supplied to the first section - 1 through perforated pipes - 8 installed in the upper part of this section. When water jets exit from the internal cavity of the pipe into the section water array through perforation holes with a diameter of 20 ... 25 mm, due to the sharp expansion of the jet, a sharp decrease in speed occurs from 600 ... 700 mm / s and at a distance of 300 ... 400 mm from the outlet the water velocity throughout the cross section of the section is 5 ... 8 mm / s, which is confirmed by experiments.

The water flow remains evenly distributed to the level of dispersants and lower, then it starts locally accelerating immediately before entering the holes of 20 ... 25 mm perforation of pipes installed in the bottom of the section. Further, the water flow through the perforated pipes - 11 and through the open ends of the perforated pipes - 12 enters the second section, is directed from the bottom up evenly along the cross section of the second section. From the open ends of the perforated upper pipes of the second section - 9, water enters the intersection compartment - 6 with an internal partition - 7, which provides a change in the direction of water, and through the perforated, muffled from one end of the pipe - 10 from the top it enters the third section of the contact reservoir and then through the lower perforated pipes - 13 are fed into the drain compartment - 5 and sent to the consumer.

This design of a three-section contact tank fully solves the problem and ensures uniform distribution of the water flow over the section cross section over the entire height of the treated water layer and provides a counterflow of water and ozone-air mixture in the first and third sections and a satellite stream of water and ozone-air mixture in the second section of the contact tank.

Claims (7)

1. A three-section contact tank for treating water with ozone, comprising: three sealed reaction vessels interconnected, preferably made of concrete, each in the form of a parallelepiped, located between the pressure compartment connected to the source of the treated water and a drain compartment having a branch for supplying water to the consumer as well as equipped with a system for feeding the ozone-air mixture into each reaction section and its dispersion into water, a system for the removal and destruction of residual ozone in the ozone-air Mesi, characterized in that in addition between the second and third sections there is an intersectional bypass compartment with a partition in the middle, at the bottom of which a through channel is made, and each section of the contact tank is additionally equipped with perforated pipes plugged from one end, one group of them is installed at the top under the level of the water horizon in the section, and the other group is installed at the bottom of the section below the dispersants of the ozone-air mixture, while the open ends of the pipes installed at the top of the water horizon the trench sections are in communication with the pressure compartment, and the open ends of the bottom pipes of the first section are docked with the bottom pipes of the second section, the open ends of the pipes installed under the water level of the second and third sections are in communication with the cavities of the intersection bypass compartment, and the open ends of the bottom pipes of the third section are communicated with drain compartment. 2. The three-section contact tank according to claim 1, characterized in that the intersection bypass compartment with a partition in the middle is made of two parallel walls spaced from each other at a distance of 0.8 ... 1.4 m, above the water level in the sections. 3. The three-section contact tank according to claim 1, characterized in that the diameters of the holes of the perforation of the pipes are 20 ... 25 mm 4. The three-section contact tank according to claim 1, characterized in that the total area of the perforated holes in each group of pipe sections is 0.01 ... 0.02 cross-sectional area of the tank section. 5. The three-section contact tank according to claim 1, characterized in that in each group of pipes their axes are parallel to each other and placed in increments of 17 to 25% of the immersion depth of the dispersants in the section. 6. The three-section contact tank according to claim 1, characterized in that the perforated pipes installed in the upper part of the contact tank section, plugged from one end, are made with one longitudinal row of rectangular windows on each side with a window height to width ratio of 2: 1, and the total width of the windows in one row is equal to half the working length of the pipe, while in the area of the windows the pipe surface is made flat, and each row of windows is equipped with a surface rail with a straight upper working edge with the possibility of installation Novki working edge parallel to and below the water level in the section at a predetermined depth with equality of water flow through a single window. 7. The three-section contact tank according to claim 1, characterized in that in the bottom part of each section of the contact tank below the dispersants of the ozone-air mixture are horizontal perforated partitions with a hole diameter of 20 ... 25 mm, and the total area of the holes in the partitions is 0.01 ... 0.02 cross-sectional areas of the section, and through channels located below the horizontal perforated partitions are made in the walls of the pressure compartment and the bypass intersection compartments.

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