Method for purifying water with organic impurities by ultrafiltration

Abstract

The invention relates to a method and an apparatus for purifying water containing organic contaminants. The technical effect of the invention is that the pollution level of the surface of the ultrafiltration membrane is reduced. The technical result is achieved by a method for purifying water containing organic impurities by ultrafiltration, consisting in the preparation of water, including, in addition to the ultrafiltration process itself, ozonation carried out in a contact tank and mixing carried out in the contact tank by recirculation. Water is fed into the ultrafiltration device via an ejector, while the ozone mixture is fed, while a second recirculation loop is organized. In the space adjacent the membrane of the ultrafiltration device, a high velocity gas-liquid state is established, forming bubbles. The flow rate of water through the injector is 0.5 m3 / h to 45 m3 / h, the flow rate of the ozone mixture is 0.3 m3 / h to 30 m3 / h, and the pressure in the delivery line of the injector is in the range of 0.2 MPa to 1.6 MPa. The claimed method is carried out using a device comprising, in addition to an ultrafiltration device, an ozonation device, a contact tank and a recirculation line, and at least one water spray injector at the inlet of the ultrafiltration device.

Description

Technical Field

[0001] The present invention relates to the field of water purification and a method and a device for water purification using ultrafiltration technology, and is mainly used for purifying water with organic impurities. Background Art

[0002] Currently, many methods and devices are known for water purification that are tailored to specific target requirements, thus allowing the desired degree of purification to be achieved. In many cases, this problem can be effectively solved by using ultrafiltration technology [1].

[0003] It is often appropriate to perform disinfection prior to ultrafiltration of the water and / or simultaneously in the primary step of water treatment, and in many cases disinfection is performed by ozonation. For example, a water purification unit is known which comprises an ultrafiltration device having a membrane ceramic element, an ozone generator, an ejector and a mixing chamber. These devices are used to feed the water and the ozone mixture simultaneously into a mixing chamber and then into two ultrafiltration devices installed in sequence [2]. However, if organic impurities are present in the water (and they are almost always present), the organic impurities are oxidized by the ozone to form viscous reaction products (slime), which contaminate or coat the membrane surface, block the pores and reduce the filtration efficiency.

[0004] The closest prototype of the present disclosure, in terms of the basic set of characteristics, is a method for purifying water with organic impurities by ultrafiltration, which method consists of a preliminary preparation of the water for ultrafiltration, for example, on a mesh filter, and ozonation in a contact tank and simultaneous mixing in the contact tank by recirculation, and the ultrafiltration process itself [3]. The method is carried out using an apparatus comprising a preliminary purification device, a water jet ejector, a contact tank, and an ultrafiltration device, which are arranged sequentially in a single technological chain. The disadvantage of this method and its corresponding implementation device is that the membrane surface is contaminated by the oxidation products of the organic impurities, and therefore the filtering capacity of the membrane surface is reduced, requiring additional cleaning measures or restoration of the membrane performance.

[0005] Problems to be solved and technical effects to be achieved

[0006] The problem to be solved by the claimed invention is to eliminate the disadvantages of the technical solutions mentioned above and to achieve the technical effect of reducing the degree of contamination of the ultrafiltration membrane surface by oxidation products of organic impurities and organochlorine impurities (organic impurities or organic matter), which achieves an increase in water purification efficiency and a reduction in the number of membrane cleaning measures. In addition, expanding the scope of technical means for the method of purifying water with organic impurities by ultrafiltration and the device for its realization should also be considered a technical achievement. Summary of the invention

[0007] The technical effect of the invention claimed for protection is achieved by realizing a method for purifying water with organic impurities by ultrafiltration, which method consists of preliminary preparation of water for ultrafiltration, which consists of ozonation carried out in a contact tank and mixing carried out by recycling in the contact tank, and the ultrafiltration process itself carried out by membrane. In addition, water is fed into the ultrafiltration device through at least one water jet ejector, and ozone-air or ozone-oxygen mixture is fed at the same time, a second recycling loop entering the contact tank and returning to the ultrafiltration device is established through the ultrafiltration device, a high-speed and / or turbulent flow pattern of gas-liquid flow is established in the near-membrane space of the ultrafiltration device, with a water-bubble flow above the membrane surface, wherein the flow rate of water through the water jet ejector is established at 0.5 m / s. 3 / hour to 45m 3 The flow rate of the ozone-air or ozone-oxygen mixture is established at 0.3 m / h. 3 / hour to 30m 3 / hour, and the pressure in the injector pressure line is established in the range of 0.2 MPa to 1.6 MPa.

[0008] In order for the description of the present disclosure to be clear and more thorough, the following provides details and disclosure of the concepts and terms used above and a description of the methods.

[0009] In the water purification process using ultrafiltration, a preliminary preparation of the water is first performed, the purpose of which is mainly to purify the water from coarse mechanical impurities and reduce a certain amount of other impurities (including homogenous impurities), thereby allowing the subsequent ultrafiltration to have a higher efficiency. For example, the preliminary preparation is performed by mechanical filter filtration, chemical treatment, oxidation, precipitation. These procedures can be performed in different variants and sequences. Among them, ozone oxidation and simultaneous mixing should be emphasized, which allow the oxidation of organic impurities in the water and the conversion of these impurities into a colloidal viscous (mucus-like) state. In this state, these impurities can already be separated. In addition, ozonation solves the problem of disinfecting bacteria and viruses.

[0010] Practice has shown that the most effective ozonation method is to feed an ozone mixture into a certain amount of water being treated by a water jet ejector (ejector). The water to be treated with ozone is usually located in a contact tank. Other known methods of ozonation, parallel feeding or bubbling of gas components and liquid components are possible, but are less efficient. Ozone-air or ozone-oxygen mixtures are usually used as ozone mixtures, depending on the degree of water pollution and the amount of water. In addition, the use of ejectors allows the direction, flow rate and gas-liquid ratio of the injection to be adjusted. According to the following scheme, more efficient ozonation can be achieved by using a recovery technology through a contact tank: from the outlet of the tank to the inlet of the tank. For recovery, a pipeline is arranged outside the contact tank. Due to the ozonation of water in the tank, the product of organic oxidation has been formed in the tank. However, complete oxidation of organic impurities in water cannot usually be achieved in a contact tank. In the present disclosure, a water jet ejector refers to an ejector in which a pressure line is achieved by pumping water, while an ozone gas mixture is fed through a suction line. The suction line is constructed on one side of the pressure line. This line is connected to the receiving chamber of the ejector, in which the high-speed water flow through the ejector pressure line creates a vacuum. Due to this vacuum, the ozone gas mixture is sucked in and then mixed with the water.

[0011] The water treated with ozone in the contact tank is fed into the ultrafiltration device (ultrafiltration module) together with the oxidation products of organic impurities. The water enters the inlet part (receiving chamber) of the ultrafiltration device through an ejector, which is a device for the filtered water to enter the inlet part of the ultrafiltration device. At the same time, the ozone mixture is fed again through the suction branch of the ejector. Advantageously, the ejector is configured to be adjustable, i.e., it is possible to adjust the rate of the pressure water flow and the flow rate of the inhaled ozone mixture and the pressure in the receiving chamber. In some cases, an ejector with two suction pipes can be constructed for introducing additional components. For design and technical reasons, a group of ejectors can be used to supply water to the ultrafiltration device. One of the advantages of this method is the increase in the ozonation and filtration rates of water.

[0012] In the receiving chamber of the ultrafiltration device, additional oxidation of organic impurities occurs. This additional oxidation can be promoted by the turbulent flow pattern of the filtered water formed at the outlet of the ejector, which is achieved by increasing the pressure of the pumping flow. Therefore, in the receiving chamber, the products of the oxidation of organic matter formed in the contact tank and the receiving chamber of the ultrafiltration device accumulate, thereby complicating the filtration process. For this reason, a drainage line connected to the contact tank is established from the receiving chamber of the ultrafiltration device (filter). Therefore, a second recirculation line is provided according to the following scheme: from the outlet of the receiving chamber of the filter - to the inlet of the contact tank, and then through the contact tank to the ejector at the inlet of the filter. In addition, in some cases, it is appropriate to install a trap and / or a drain pipe for the products of organic oxidation at the technically determined point of the pipeline. In particular, it is appropriate to adopt this method when the volume of the receiving chamber of the ultrafiltration device is small. All pipelines of the technical process, the inlet and outlet of its device are equipped with shut-off valves and control valves. The general conditions for filtration through the ultrafiltration membrane are as follows: the differential pressure is 0.05MPa to 0.6MPa, and the flow rate of the ozone-air mixture through the ejector is 0.3m 3 / hour to 30m 3 / hour, the ozone content dissolved in water is 0.01g / m 3 Up to 1.0g / m 3 , the degree of water purification is as high as 92%.

[0013] It is well known that the oxidation of organic impurities proceeds more thoroughly under alkaline conditions, so in order to achieve this feature, it is appropriate to create alkaline conditions in the receiving chamber [4]. To this end, the catholyte from an external electrolyzer can be introduced into the receiving chamber of the ultrafiltration device to obtain a pH condition of 8.0 to 11.0.

[0014] The challenging problem about the filtration efficiency of ultrafiltration device is that the surface of ultrafiltration membrane is polluted by the viscous products of organic oxidation, which are mainly colloidal substances. These products will adhere to the membrane surface and block the holes, thereby hindering filtration. It is known from practice that the viscous products are prevented from adhering to the membrane by providing a high speed and / or turbulent flow mode of liquid flow in the filter receiving chamber, because these products will be mechanically washed away by the liquid flow. In the case of intentionally generating a bubble mode in the flow, that is, generating a large number of bubbles in the water flow to be filtered or forming a water-bubble flow, the process is significantly enhanced. In addition, it is first necessary to generate this mode in the near-membrane space (i.e. in the space adjacent to the membrane surface). Therefore, a gas-liquid flow is formed, in which the gas is in the form of multiple bubbles, which, together with the simultaneous action of the high-speed water flow, wash away the viscous mucus on the membrane surface. The efficiency of cleaning the viscous products on the membrane by washing away the viscous products of organic oxidation together with the water-bubble flow around the membrane surface has been proven in practice. This bubble pattern, which can effectively flush the viscous products of organic oxidation from the surface of the ultrafiltration membrane, is achieved by using a water jet ejector with the following parameters: the water flow through the water jet ejector is 0.5 m 3 / hour to 45m 3 / hour, the flow rate of ozone-air or ozone-oxygen mixture is 0.3m 3 / hour to 30m 3 / hour, the ratio between the nozzle diameter of the suction flow and the nozzle diameter of the pressure water flow is 0.35 to 1.0, the pressure in the ejector pressure line is varied in the range of 0.2 MPa to 1.6 MPa, and the vacuum in the receiving chamber of the water jet ejector is in the range of 0.03 MPa to 0.098 MPa relative to atmospheric pressure. The cleaning efficiency can be increased to a greater extent by using a set of ejectors placed at optimal points. For example, such points are the positions between the tubular membranes or in the direction corresponding to the flow around the membrane surface.

[0015] By optimal placement of the ejectors and by further providing separators and flow guides to direct the water-bubble flow towards the membrane surface while controlling the flow velocity, an efficient water-bubble flow around the membrane surface is achieved.

[0016] The use of ceramic materials based on oxides (e.g., silicon oxide and titanium oxide) also improves the efficiency of membrane surface cleaning. This can be explained by the low physicochemical affinity of the products of organic oxidation for these oxides, which is derived from the practice of using ceramic ultrafiltration membranes.

[0017] The contact tank is designed with a chamber for feed water and an ejector inlet and a second recovery line, the tank also containing an outlet into a pipeline leading to an ultrafiltration device. The ultrafiltration device is advantageously a cylindrical tank inside which a tubular membrane made of titanium oxide and silicon oxide is arranged. The pore size of the membrane is 0.001 m to 0.1 μm. For one tubular membrane, the total filtration area of ​​the membrane is 0.15 m 2 Up to 2m 2 , or up to 24m for the entire installation 2 , the device is advantageously constructed with 12 membranes. The filter chamber has partitions which, together with the membranes, divide its volume into a receiving chamber and a filtrate compartment. The chamber has an inlet for arranging an ejector and two outlets for connecting a second recovery conduit and a filtrate outlet conduit. If more than one ejector is used, the chamber has a corresponding number of inlets. The design and design elements can be made of stainless steel and polymers and composite materials.

[0018] The essential features or characteristics of the claimed invention, as opposed to the closest technical solution, are:

[0019] - feeding water into the ultrafiltration device through at least one water jet injector and simultaneously feeding ozone-air or ozone-oxygen mixture,

[0020] - providing a second recirculation loop via an ultrafiltration unit and a contact tank,

[0021] - Provide a high-speed and / or turbulent gas-liquid pattern in the near-membrane space, with a water-bubble flow around the membrane surface, wherein the following gas-liquid pattern is provided:

[0022] --The flow rate of water through the water jet is 0.5m 3 / hour to 45m 3 / Hour,

[0023] --The flow rate of ozone-air or ozone-oxygen mixture is 0.3m 3 / hour to 30m 3 / Hour,

[0024] --The pressure in the receiving chamber of the water jet ejector is in the range of 0.2 MPa to 1.6 MPa.

[0025] The basic features mentioned above are different from the closest technical solution because each basic feature is not included in the prototype basic feature set, that is, it does not exist in the feature list provided in the prototype and is not its characteristic. As shown above, when using other basic features of the invention specified in the description, the basic features that are different from the prototype and include its characteristics will achieve the technical effect claimed.

[0026] Therefore, it is shown that the basic feature set of the claimed invention that allows the claimed technical effect to be achieved is different from the basic feature set of analogs, prototypes and other known data sources, that is, it is unknown to use the basic feature set to obtain the claimed technical effect. In other words, the claimed invention is unknown in the prior art.

[0027] In the search for a method for purifying water with organic impurities by ultrafiltration of the prior art and a device for its realization, no technical solution was identified, the essential features of which (either alone or in any combination) are consistent with the distinctive essential features of the claimed invention and allow the claimed technical effect to be achieved. Therefore, it is confirmed that the influence of the distinctive essential features of the claimed invention on the claimed technical effect is unknown.

[0028] It should also be noted that the use of the entire set of claimed basic features, including the set of distinctive features, to obtain the claimed technical effect is not obvious to a person skilled in the art because it is not a combination, variation or joint use of information included in the prior art and / or the general knowledge of the person skilled in the art.

[0029] In fact, due to the use of the distinguishing basic characteristics mentioned above, it is not obvious to technicians in the prior art that the degree of contamination of the ultrafiltration membrane surface by these products is reduced due to the oxidation products of organic impurities being flushed away from the ultrafiltration membrane surface by the water-bubble flow (which in turn leads to an increase in water purification efficiency and a reduction in the number of membrane cleaning measures).

[0030] With regard to the confirmation of the claimed technical effect, the technical solution is a non-standard and unknown solution. In addition, these solutions or these combinations of basic features should be considered in a single set together with the use of other basic features specified in the claims.

[0031] The increase in efficiency in the technical effect of the claimed method is achieved in the following modifications of the method, which are characterized by a specific implementation of the method:

[0032] 1. The above method for purifying water with organic impurities by ultrafiltration technology, characterized in that alkaline conditions in the pH range of 8.0 to 11.0 are generated in the receiving chamber of the ultrafiltration device by feeding catholyte from an external electrolyzer.

[0033] 2. The above method for purifying water with organic impurities by ultrafiltration technology, characterized in that the filtration in the ultrafiltration device is performed by an ultrafiltration membrane made of a mixture of oxide materials based on titanium oxide and silicon oxide.

[0034] 3. The above method for purifying water with organic impurities by ultrafiltration technology is characterized in that the pressure in the receiving chamber of the water spray ejector is in the range of 0.03 MPa to 0.098 MPa.

[0035] The above method for purifying water with organic impurities by ultrafiltration involves providing a device, the design elements of which are described above together with the description of the method, namely: a device for purifying water with organic impurities by ultrafiltration, the device comprising an ozonation device, a contact tank, a recovery line and the ultrafiltration device itself. In addition, the device comprises an additional recovery line starting from the ultrafiltration device and returning through the contact tank, as well as an additional ozonation device (additional device) in the form of at least one water jet ejector at the inlet of the ultrafiltration device, wherein the ratio of the working diameter of the suction nozzle to the working diameter of the pressure line nozzle is in the range of 0.35 to 1.0, wherein the nozzle is capable of establishing a flow rate of ozone-air or ozone-oxygen mixture for each ejector at 0.3 m / s. 3 / hour to 30m 3 / hour, and the water flow rate is established at 0.5m 3 / hour to 45m 3 / hour range, thereby providing the possibility of generating a water-bubble flow in the filter receiving chamber, around the surface of the membrane.

[0036] The increase in efficiency in the technical effect of the claimed device is achieved in the following modifications to the method, which are characterized by a particular embodiment of the method:

[0037] 1. The above device for purifying water with organic impurities by ultrafiltration technology, characterized in that a catholyte supply pipeline is provided from an external electrolyzer to a receiving chamber of the ultrafiltration device to produce alkaline conditions in the water to be filtered.

[0038] 2. The above-mentioned device for purifying water with organic impurities by ultrafiltration technology is characterized in that the ultrafiltration membrane in the ultrafiltration device is made of a mixture of oxide materials based on titanium oxide and silicon oxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The description of the claimed method is explained by a diagram showing the following names of its processes:

[0040] 1- Disinfection of source water by ozonation in contact tanks,

[0041] 2- Mixing by recirculation (primary recirculation),

[0042] 21 - Inlet of the secondary recirculation line,

[0043] 3-Ultrafiltration,

[0044] 31- Water feed via water jet injectors,

[0045] 32- Feed of ozone mixture through an ejector,

[0046] 33- Input of additional components,

[0047] 34 - outlet of the secondary recirculation line,

[0048] 35- Use special traps to separate oxidation products from organic impurities,

[0049] 36 - outlet of the filtrate pipeline,

[0050] 4-Ultrafiltration device,

[0051] 41-Ultrafiltration tubular membrane,

[0052] 42-water-bubble flow,

[0053] 43-Oxidation products of organic impurities. DETAILED DESCRIPTION

[0054] The claimed invention "Method of water purification with organic impurities by ultrafiltration and device for implementation thereof" is implemented as follows.

[0055] Typically, the implementation of the method begins with cleaning the coarse impurities on the filter or mechanical cleaning device. After that, the water is fed into the contact tank, where it is ozonated 1 for the purpose of oxidation of organic impurities and disinfection, while mixing by recirculation 2 according to the following scheme: from the outlet of the tank to the inlet of the tank. The ozone-treated water is fed to the ultrafiltration device for further purification (ultrafiltration step) 3. The water is fed to the ultrafiltration device through a water spraying ejector 31. At the same time, an ozone-air or ozone-oxygen mixture 32 is fed through the ejector. In addition, additional components 33 can be fed through an additional ejector branch or another device. A portion of the filtered water is transferred from the receiving chamber of the device to the contact tank, thereby realizing a second recirculation line 34 according to the following scheme: from the outlet of the filter receiving chamber to the inlet of the contact tank, and then through the contact tank to the ejector at the filter inlet. At the recirculation line, a special trap 35 is used to construct the oxidation products of the separation of organic impurities. A filtrate line 36 is drawn from the filtrate compartment of the ultrafiltration device. Ultrafiltration is performed through a tubular ceramic membrane 4 with a pore size of 0.01 μm to 0.1 μm. In order to maintain effective filtration in the near-membrane space 41, a directional water-bubble flow 42 is established, which washes away the oxidation products 43 of organic impurities from the membrane surface. The general conditions for filtration through the ultrafiltration membrane are as follows: the differential pressure is 0.05 MPa to 0.6 MPa, the flow rate of the ozone-air mixture through the ejector is 0.3 m 3 / hour to 30m 3 / hour, the ozone content dissolved in water is 0.01g / m 3 Up to 1.0g / m 3 , the degree of water purification is as high as 92%. The total filtration surface area of ​​the membrane is 0.15m 2 Up to 2m 2 (The entire ultrafiltration device is up to 24m 2 ).

[0056] The described method and apparatus operate as follows.

[0057] The water to be purified first passes through a mechanical filter and is then fed into a contact tank for ozonation. Ozonation is performed via bubbling through a water layer or by means of a water jet ejector installed at the inlet of the tank. At the same time, the water in the contact tank is mixed with an ozone mixture via recovery through an external circuit according to the following scheme: from the outlet of the tank to the inlet of the tank. The water ozonated in this way is fed into an ultrafiltration device. At the inlet of the device, a water jet ejector is provided, with which additional ozonation of the water is performed with an ozone-air or ozone-oxygen mixture. In addition, by adjusting the flow rates of the water and air streams, a high-speed water-bubble flow around the membrane surface is achieved, which washes away the viscous oxidation products of organic impurities from the membrane surface. A portion of the liquid is drawn off from the receiving chamber to feed into the contact tank, thereby realizing a second recovery line. A trap is installed in this line for separating the oxidation products of organic impurities, which are periodically discharged, i.e. removed from the process chain. The generation of the water-bubble flow is monitored by visual observation through a special transparent window or based on the flow structure through the trap. Additional components such as catholyte can also be introduced into the receiving chamber. The water that passes through the membrane is collected in the filtrate compartment and discharged through a separate line.

[0058] Example 1

[0059] The raw water has the following characteristics: Iron content is 1.5 mg / dm 3 , manganese content is 0.3mg / dm 3 , oil products are 0.1mg / dm 3 , ammonia is 2.5mg / dm 3 The oxidizing capacity of permanganate is 6 mg O2 / dm 3 , trace amounts of chlorine and organochlorine compounds are present.

[0060] The water was fed into a 400 L contact tank, where an ozone-air mixture with an ozone content of 8 mg / l was bubbled through the water. From the tank, the ozonated water was fed into an ultrafiltration unit. At the same time, a portion of the flow was withdrawn from the tank outlet and sent back to the tank inlet through an external pipe, thereby mixing. The water consumption was 2m 3 / hour. The filtration pressure difference through the membrane is 0.2MPa, and the membrane filtration surface area is 2.0m 2 At the filter outlet, the water has the following characteristics: Iron content 0.2 mg / dm 3 , manganese content from 0.1mg / dm 3 For oil products, it is 0.01mg / dm 3 , ammonia is 1.6 mg / dm 3 , the oxidizing capacity of permanganate is from 4mg O2 / dm 3 There are no traces of chlorine and organochlorine compounds.

[0061] In order to maintain constant purification parameters, the inlet section of the ultrafiltration device and its membranes were cleaned once a week. The vacuum in the receiving chamber of the water jet ejector was in the range of 0.03 MPa to 0.098 MPa relative to atmospheric pressure.

[0062] Example 2

[0063] The raw water characteristics are similar to those specified in Example 1. Water purification is also performed using the method specified in Example 1. However, in addition, a portion of the filtered water is transferred from the receiving chamber back to the contact tank through a separate pipe, thereby realizing a second recirculation loop. The viscous products of organic oxidation are regularly discharged from the trap. In the receiving chamber, a water-bubble flow is performed in the near-membrane layer to clean the surface of the membrane, which is monitored by visual observation through a special transparent window. The water-bubble mode is performed by maintaining the following characteristics: the flow rate of the water is 0.5 m / s 3 / hour, the flow rate of ozone-air mixture is 0.3m 3 / hour, wherein the diameter of the suction nozzle is 3 mm, and the diameter of the pressure nozzle is 3 mm, the vacuum in the receiving chamber of the water jet ejector is 0.03 MPa relative to the atmospheric pressure, and the content of dissolved ozone in the water is 0.01 g / m 3 The filtration pressure difference through the membrane is 0.05MPa, and the membrane filtration surface area is 0.15m 2 (for a tubular membrane). At the outlet of the filter, the water has the following properties: Iron content 0.01 mg / dm 3 , manganese content from 0.01mg / dm 3 For oil products, it is 0.01mg / dm 3 , ammonia is 0.5mg / dm 3 The oxidizing capacity of permanganate is from 1mg O2 / dm 3 There are no traces of chlorine and organochlorine compounds.

[0064] In order to maintain constant cleaning parameters, the inlet section of the UF unit and its membranes are cleaned every 4 months.

[0065] Example 3

[0066] The raw water characteristics are similar to those specified in Example 1. Water purification is also performed using the method specified in Example 1. However, in addition, a portion of the filtered water is transferred from the receiving chamber back to the contact tank through a separate pipeline, thereby realizing a second recirculation loop. A trap is installed in this line to separate the oxidation products of organic impurities. The viscous products of the oxidation of organic matter are regularly discharged from the trap. In the receiving chamber, a water-bubble flow is performed in the near-membrane layer, thereby cleaning the surface of the membrane, which is monitored by visual observation through a special transparent window. The water-bubble mode is performed by maintaining the following characteristics: the flow rate of the water is 45m 3 / hour, the flow rate of ozone-air mixture is 30m 3 / hour, wherein the diameter of the suction nozzle is 20 mm and the diameter of the pressure nozzle is 56 mm, the vacuum in the receiving chamber of the water jet ejector is 0.098 MPa relative to atmospheric pressure, the filtration pressure difference across the membrane is 0.6 MPa, and the membrane filtration surface area is 24 m 2 (For 12 tubular membranes) The water was fed through a set of 6 ejectors.

[0067] At the outlet of the filter, the water has the following characteristics: Iron content 0.02 mg / dm 3 , manganese content from 0.03mg / dm 3 For oil products, it is 0.01mg / dm3, and for ammonia, it is 0.6mg / dm 3 The oxidizing capacity of permanganate is from 1.5 mg O2 / dm 3 There are no traces of chlorine and organochlorine compounds.

[0068] In order to maintain constant cleaning parameters, the inlet section of the UF unit and its membranes are cleaned every 4 months.

[0069] Example 4

[0070] The raw water has the following characteristics: Iron content is 15mg / dm 3 , manganese content from 1mg / dm 3 For oil products, 0.5 mg / dm 3 , ammonia is 7mg / dm 3 , the oxidizing capacity of permanganate is from 10mg O2 / dm 3 Chlorine and organochlorine compounds are present in trace amounts.

[0071] Water purification was also performed according to the method specified in Example 2. However, in addition, a portion of the purified water was passed through the electrolyzer and the catholyte was fed into the contact tank through a separate pipe, thereby increasing the pH to 8.5. In the receiving chamber, a water-bubble flow was performed in the near-membrane layer, thereby cleaning the surface of the membrane, which was monitored via visual observation through a special transparent window. The water-bubble mode was performed by maintaining the following characteristics: the flow rate of the water was 3 m / s. 3 / hour, the flow rate of ozone-air mixture is 1m 3 / hour, wherein the diameter of the suction nozzle is 6 mm and the diameter of the pressure nozzle is 8 mm, the vacuum in the receiving chamber of the water jet ejector is 0.05 MPa relative to atmospheric pressure, the filtration pressure difference across the membrane is 0.2 MPa, and the membrane filtration surface area is 1 m 2 .

[0072] At the filter outlet, the water has the following properties: Iron content 0.01 mg / dm 3 , manganese content from 0.01mg / dm 3 For oil products, it is 0.01mg / dm 3 , ammonia is 0.3mg / dm 3 The oxidizing capacity of permanganate is from 1.5 mg O2 / dm 3 In order to maintain constant cleaning parameters, the inlet section of the ultrafiltration unit and its membranes are cleaned every 5 months.

[0073] The above examples should not be considered as limiting the scope of the present invention. On the contrary, variations, modifications and equivalents of the described examples are possible within the scope of protection set forth in the following claims.

[0074] Industrial applicability and technical effect of the present invention

[0075] The claimed invention is a technical solution, since it is a solution to the problem of achieving the claimed technical effect by implementing a method consisting in performing actions on material objects using material means. The material objects in this case are water, ozone gas mixture. The following actions are performed on these material objects: water feeding, water treatment with ozone, water purification by filtration, flow separation, regulating the feeding and consumption of water and ozone mixture. All actions on said material objects are performed in time and in a certain order. At the same time, said set of actions and essential features of the invention are interconnected technically and functionally and are held together by a single inventive concept.

[0076] The technical solution is industrially applicable in various fields of national economy where high purity water is needed, particularly in various fields of medicine, chemistry and food industry. The technical solution claimed can be realized by those skilled in the art. In the implementation of the method for obtaining and selling alkaline water, commercially manufactured and available devices, instruments and materials are used. The technology used to realize the technical process of the present invention is the machining technology of metals and plastics, the electric welding and heat welding technology of plastics, metal processing technology, installation technology. The means of realization are mechanical means, machine tools and hand tools for machining, welding equipment.

[0077] The above-mentioned set of basic features of the claimed invention and its disclosure allows the following conclusion to be drawn: the claimed technical effect has been achieved, which is to reduce the degree of contamination of the ultrafiltration membrane surface by the oxidation products of organic impurities by flushing these products from the ultrafiltration membrane surface with the help of a water-bubble flow, thereby achieving an increase in water purification efficiency and a reduction in the number of membrane cleaning measures.

[0078] In addition, the technical effect should also be considered as an expansion of the scope of technical means for purifying water with organic impurities by ultrafiltration and the device for realizing the same.

[0079] The above description of the implementation of the present invention and the examples of its embodiments confirm that the claimed technical effects are achieved in the process of implementing the present invention. They also show the causal relationship between the basic features themselves and the achieved technical effects.

[0080] It will also be inferred from the above description that the technical effect can only be achieved if the entire set of basic features is implemented, which also confirms the technical solution to the problem of implementing the present invention.

[0081] References

[0082] 1.Α.Г.Первов,Α. П.Бндрианов. u / articles / 1-metod-ultrafiltratsii-v-sovremennom-vodosnabjenii-problemyi-i-perspektivyi (accessed April 12, 2022).

[0083] 2. I. M. Tesker, V. V. Novozhenin, Yu. N. Dubov. Russian Patent No. 2155165, IPC C02F 9 / 00, February 16, 2000.

[0084] 3. D. V. Tateosov. Russian Patent No. 2668036, IPC C02F 1 / 78, C02F 9 / 08, February 14, 2017.

[0085] 4. V. F. Kozhinov, I. V. Kozhinov. Ozonation of water. [web] URL: https: / / helpiks.org / 2-71562.html (date of access: March 25, 2022).

Claims

1. A method for purifying water with organic impurities by ultrafiltration technology, said method consisting of a preliminary preparation of water for said ultrafiltration, said preliminary preparation consisting of ozonation in a contact tank and mixing in said contact tank by recirculation, and the ultrafiltration process itself by membranes, characterized in that Water is fed into the ultrafiltration device through at least one water jet ejector, and simultaneously ozone-air or ozone-oxygen mixture is fed, a second recirculation loop is provided through the ultrafiltration device into the contact tank and back into the ultrafiltration device, a high-speed and / or turbulent gas-liquid mode is implemented in the near-membrane space of the ultrafiltration device, with a water-bubble flow around the membrane surface, wherein the flow rate of the water through the water jet ejector is established at 0.5 m / s. 3 / hour to 45m 3 / hour, the flow rate of the ozone-air or ozone-oxygen mixture is established at 0.3m 3 / hour to 30m 3 / hour, and the pressure in the injector pressure line is established in the range of 0.2 MPa to 1.6 MPa.

2. The method according to claim 1, characterized in that By introducing a catholyte from an electrolyte external to the ultrafiltration device, alkaline conditions in the pH range of 8.0 to 11.0 are generated in the receiving chamber of the ultrafiltration device.

3. The method according to claim 1, characterized in that The filtration in the ultrafiltration device is performed by an ultrafiltration membrane made of a mixture of oxide materials based on titanium oxide and silicon oxide.

4. The method according to claim 1, characterized in that: The vacuum in the receiving chamber of the water jet ejector is in the range of 0.03 MPa to 0.098 MPa relative to atmospheric pressure.

5. A device for purifying water with organic impurities by ultrafiltration technology, comprising an ozonation device, a contact tank, a recovery line and the ultrafiltration device itself, characterized in that: The device comprises an additional recovery line starting from the ultrafiltration device and returning through the contact tank, and an additional ozonation device (additional device) in the form of at least one water jet ejector at the inlet of the ultrafiltration device, wherein the ratio of the working diameter of the suction nozzle to the working diameter of the pressure line nozzle is in the range of 0.35 to 1.0, wherein the nozzle provides for establishing the flow rate of the ozone-air or ozone-oxygen mixture for each ejector at 0.3 m / s. 3 / hour to 30m 3 / hour, and the water flow rate is established at 0.5m 3 / hour to 45m 3 / hour, thereby providing the possibility of generating a water-bubble flow in the filter receiving chamber, around the surface of the membrane.

6. The device according to claim 1, characterized in that A catholyte supply line is provided from an external electrolyzer to the receiving chamber of the ultrafiltration device to produce alkaline conditions in the water to be filtered.

7. The device according to claim 1, characterized in that The ultrafiltration membrane in the ultrafiltration device is made of a mixture of oxide materials based on titanium oxide and silicon oxide.

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