Non-chemical method for purifying water of iron and manganese

Abstract

The invention relates to a method and device for purifying industrial and natural water of iron and manganese by oxidation of the contaminants with ozone, followed by filtration. The method includes treating water with ozone by combining the water with ozone in an ejector. The water and ozone are then mixed in a static mixer. The water is then sent to a settling tank for the sedimentation of sludge. From the settling tank, the water is sent for filtration using at least one disc filter with a filter rating of not less than 20 μm. The water is then subjected to tangential microfiltration using a cross-flow method. The result is that of allowing the effective non-chemical purification of water, while minimizing the costs of the purification process and equipment maintenance.

Description

[0001] A METHOD FOR REAGENT-FREE WATER PURIFICATION FROM IRON AND MANGANESE.

[0002] Field of technology.

[0003] The present invention relates to methods and devices for purifying industrial and natural waters from iron and manganese by oxidizing impurities with ozone followed by filtration.

[0004] State of the art.

[0005] Purification of industrial and natural waters from manganese and iron is a pressing task for the production of food and chemical industries, requiring a systematic approach and the use of effective filtration and purification methods.

[0006] A method for purifying water from iron compounds is known from the prior art according to patent US4780215A [1] “Water Purification Device”, which includes obtaining ozone-enriched air by passing a stream of air through an electric arc, feeding the ozone-enriched air stream into water located in a well (borehole), removing water after oxidation of impurities from the well (borehole) and filtering it.

[0007] The disadvantages of this method include low efficiency of oxidation of impurities due to the short time and area of ​​contact of ozone with water, since after a short passage of ozone through a layer of water (bubbling), it freely flows into the surrounding space. To ensure the required degree of oxidation of impurities, a large flow rate of ozone is required. It is indicated that an air outlet is located at the top of the well (borehole), this leads to a free leakage of ozone, which has not had time to react in the thickness of water, such a layout can be harmful to human health. The method does not disclose the preferred method of filtration and the order of removal of sediment formed in the well during the oxidation of impurities.

[0008] A method for purifying water from manganese and iron compounds is known from the prior art according to patent SU1546435A1 [2] "Method for purifying water from manganese and iron compounds", which includes ozonation of the source water followed by filtration through a granular load, which is a composition of zeolite, expanded clay or quartz sand with tetravalent manganese hydroxide. The disadvantage of this method is the need for periodic renewal of the granular load, the filtration efficiency of which decreases over time.

[0009] A method for purifying groundwater from iron and manganese is known from the prior art according to patent RU2105729C1 [3] “Method for purifying groundwater from iron and manganese”, including ozonation and sequential two-stage filtration through a granular load with water supplied from the bottom up in the first stage and from the top down in the second stage, characterized in that before water is supplied to the first stage, it is subjected to simplified aeration, and ozonation is carried out before the second stage of the filter in an amount of 3.5-5.5 mg / dm3. 3 , and the diameter of the porous loading of the first stage of the filter is 1.25-2.5 mm, the second stage 0.63-1.25 mm.

[0010] The disadvantage of this method is the need for periodic renewal of the granular loading and the need for oxidation in two stages, which is not always technologically justified.

[0011] A method for purifying industrial wastewater using electrochemical methods and additional oxidation processes is known from the prior art according to patent RU2624643C2 [4] “Method and device for electrochemical treatment of industrial wastewater and drinking water”, which includes a phase of preparing the contaminated medium by sedimentation, a reaction phase in the first reactor vessel, where the contaminated medium is treated with reactor electrodes made of fixed stainless steel plates, through which direct current is passed with electrocoagulation, electrooxidation, electroflotation and disinfection of the medium by means of ozone circulation and UV irradiation with circulation and electromagnetic and ultrasonic treatment, a reaction phase in the second reactor vessel, where the contaminated medium is treated with reactor electrodes made of fixed steel plates,through which direct current is passed with subsequent passage through an additional set of reactor electrodes made of fixed aluminum plates with electrocoagulation, electrooxidation, electroflotation and disinfection of the medium by means of ozone circulation and UV irradiation with circulation and electromagnetic and ultrasonic treatment, a coagulation and flocculation phase, a separation phase by sedimentation, an additional oxidation phase with simultaneous ozonation and ultraviolet radiation treatment, a filtration phase through a sand filter and an activated carbon filter. The disadvantages of this method include the complex design of the equipment for its implementation, its redundancy for the purposes of water purification from impurities, among which iron and manganese predominate, including the use of reactors with electrodes for electrocoagulation, electrooxidation and electroflotation is energy-intensive and requires regular replacement of the electrodes.

[0012] A method for purifying water from iron and manganese is known from the prior art according to patent CN101224928 A [5], in which oxidation is carried out with ozone, a coagulant is introduced to carry out coagulation in a coagulation pool, and then the water undergoes filtration with a microporous membrane.

[0013] The disadvantage of using methods using coagulants is the need for their constant introduction and dosing during the water purification process, which is not always technologically justified, leads to additional costs and complication of the equipment.

[0014] A device and method for purifying water from manganese are known from the prior art according to publication CN110372131 A [6], according to the specified method, water and ozone are mixed through an ejector, a gas-water mixture is obtained, which is fed to static mixing, and then to a reaction tank, where the oxidation of impurities occurs, while the residual ozone is removed to an ozone destructor and water is fed to flow filtration on a filter with a membrane made of polyvinylidene fluoride (PVDF), during the filtration process the sediment is additionally filtered on a filter press, the filtrate after the membrane filter is pumped into a device for additional filtration from manganese.

[0015] The device for implementing the specified method includes an ozone generator, pumps, pipelines, an ejector, a static mixer, a reaction tower, a tank with a filter, a PVDF membrane filter, a plate-and-frame filter press, an ozone destructor, a buffer pool, and a deep filtration purification device.

[0016] This publication was chosen as a prototype.

[0017] The disadvantages of this method and device are the lack of a separate settling tank for sedimentation of insoluble impurity oxidation products, which leads to excessive contamination of the filters. The membrane of the first filter made of polyvinylidene fluoride (PVDF) is a membrane with a filtration rating of 0.1 μm, such a membrane has a relatively high cost and its use at an early stage of cleaning requires its frequent backwashing due to the presence of a large number of impurities at this stage.

[0018] The search for an effective and technically simple method for cleaning industrial and natural waters from manganese and iron is a pressing issue for chemical industries.

[0019] The essence of the invention.

[0020] The aim of the present invention is to ensure efficient purification of water from iron and manganese with a reduction in the costs of the purification process and equipment maintenance.

[0021] The stated objective is achieved by carrying out reagent-free purification of water from iron and manganese, including treating the water with ozone by mixing water and ozone in an ejector, mixing water and ozone in a static mixer and subsequent filtration, wherein after treatment with ozone, the water is sent to a settling tank for sedimentation, from the settling tank the water is sent for filtration using at least one disk filter with a filtration rating of at least 20 μm, and then for tangential microfiltration using the cross-flow method, when implementing the method, ozone can be obtained in a barrier ozonizer from oxygen, when implementing the method, oxygen for obtaining ozone can be obtained by isolating it from the air using zeolite, when implementing the method, ozonation can be carried out by recirculating water through the ejector, when implementing the method, excess ozone can be passed through a thermal catalytic ozone destructor,when implementing the method, excess ozone is reused for ozonation, when implementing the method, after ozonation and before the precipitation stage, the oxidation-reduction potential and pH can be measured, when implementing the method, several disk filters can be used in order of decreasing filtration rating, with the last filter used having a filtration rating of 20 μm, when implementing the method, at least one disk filter can be washed from contaminants in the direction opposite to filtration, when implementing the method, tangential microfiltration by the cross-flow method can be carried out using a filter with a filtration rating of 0.2 μm.

[0022] The stated objective is achieved in that the method is implemented using a device comprising an ozone generator, an ozone supply line, a water supply pump, a water supply line, an ejector for mixing water with ozone, a static mixer located after the ejector, a water filtration system, a container for collecting purified water, a sedimentation tank for settling sediment, which is connected to the filtration system, wherein the filtration system contains at least one disc filter with a filtration rating of at least 20 μm and at least one tangential microfiltration filter installed after the disc filter and providing tangential microfiltration using the cross-flow method, the device may additionally contain a storage tank for ozonation, into which ozonized water can flow from the static mixer, wherein the storage tank for ozonation can be connected to the water supply line to the ejector,which provides the possibility of feeding water from the storage tank for ozonation to the ejector, the storage tank for ozonation can be connected to a settling tank, which provides the supply of ozonized water from the ozonation tank to the settling tank, the water supply line for purification can be connected to the storage tank for ozonation, the device can include a thermal catalytic ozone destructor connected by a channel to the upper part of the settling tank, this thermal catalytic ozone destructor can be connected to the upper part of the storage tank for ozonation, the storage tank for ozonation can be equipped with a mixer, the ozone generator can be made in the form of a barrier ozonizer, the device can include a unit for obtaining oxygen from air using zeolite, which is connected to the ozone generator, the upper part of the settling tank can be connected to a channel for supplying air to the ozone generator,the upper part of the settling tank can be connected to a container for collecting residual ozone, the settling tank can be equipped with a sediment discharge system.

[0023] The claimed technical result: efficient reagent-free water purification, reduction of the cost of the water purification process, reduction of the labor intensity and frequency of maintenance of filtering equipment, ensuring efficient oxidation of impurities, economical use of ozone.

[0024] The technical result is achieved by the fact that the specified process allows for the purification of water from iron and manganese impurities without the use of reagents, including for ensuring flotation and coagulation, which simplifies and reduces the cost of the design of water purification equipment and eliminates the costs associated with the purchase and supply of reagents.

[0025] The device for implementing this method also provides reagent-free water purification.

[0026] The technical result is achieved by the fact that in the process of water purification from iron and manganese, the mixing of water with ozone is carried out in an ejector, and then in a static mixer, which ensures the most complete mixing and the greatest complete contact of impurities with ozone, which ensures their most complete oxidation and savings in ozone consumption.

[0027] The device for implementing this method also ensures mixing of water with ozone in the ejector and then in the static mixer.

[0028] The technical result is achieved by the fact that in the process of water purification from iron and manganese, a settling tank is used to settle and separate the insoluble sediment after ozonation, which increases the time of continuous operation of the filters due to the separation of part of the impurities before filtration, this also ensures a reduction in hydraulic resistance and increases the overall service life of the filter elements.

[0029] The device for implementing this method is also equipped with a settling tank for sedimentation; the device can also be equipped with a sediment discharge system.

[0030] The technical result is achieved by the fact that at the first stage of filtration at least one disc filter with a filtration rating of at least 20 μm is used, the use of such disc filters ensures a reduction in the load on tangential filters due to the filtering of coarse pollutants, while such a filtration rating does not create excessive resistance to flow and excessive loads on pumping equipment, while disc filters have the ability to be washed without disassembling and dismantling them.

[0031] The device for implementing this method is also equipped with at least one disc filter with a filtration rating of at least 20 microns.

[0032] The technical result is achieved by the fact that at the second stage of filtration, tangential microfiltration is carried out using the cross-flow method, which ensures a high degree of purification from suspended and colloidal substances, achieving less than 3 mg / dm3. 3 by the total content of iron and manganese (in total), while the tangential microfiltration unit does not require frequent maintenance due to the fact that in the tangential scheme the membrane walls are less susceptible to becoming clogged with impurities due to the flow movement along them.

[0033] The device for implementing this method is also equipped with a cross-flow tangential microfiltration unit.

[0034] The technical result is achieved by the fact that ozone is obtained in a barrier ozonizer from oxygen, and the oxygen is released using zeolite, which ensures the presence of the ozone necessary for the process in the water purification section in the required volume, which ensures the autonomy of the purification line and avoids overproduction of ozone, which increases the cost of water purification.

[0035] The device for implementing this method can also be equipped with an ozonation unit and an oxygen production unit using zeolite.

[0036] The technical result is achieved by the fact that water, having been mixed with ozone in the ejector, is redirected into the ejector for mixing with ozone (ozonation in recirculation mode), which ensures additional saturation of water with ozone for more complete oxidation of impurities.

[0037] The device for implementing the method includes a storage tank for ozonation, which ensures the collection of water from the static mixer and allows water to be supplied to the ejector for ozonation.

[0038] The technical result is achieved by passing excess ozone through a thermal catalytic ozone destructor, which ensures occupational safety standards and protects workers from its effects.

[0039] The device for implementing this method can also be equipped with a thermal catalytic ozone destructor.

[0040] The technical result is achieved by the fact that after ozonation and before the precipitation stage, the oxidation-reduction potential and pH are measured, which makes it possible to adjust the ozone supply and the water circulation rate to achieve the optimal oxidation and filtration mode.

[0041] The technical result is achieved by using several disc filters in order of decreasing filtration rating, with the last filter used being a filter with a filtration rating of 20 μm, which ensures filtration of larger particles before filtration on a filter with a lower filtration rating (20 μm), this increases the time of continuous operation of filters by reducing fouling of filters with a low filtration rating, this also ensures a reduction in hydraulic resistance and increases the overall service life of filter elements.

[0042] The technical result is achieved by the fact that at least one disc filter is washed from contaminants in the direction opposite to filtration, which ensures cleaning of the filters, which ensures a reduction in hydraulic resistance and increases the overall service life of the filter elements.

[0043] The technical result is achieved by the fact that tangential microfiltration by the cross-flow method is carried out using a filter with a filtration rating of 0.2 μm, which is the optimal filtration rating. Membranes with such a filtration rating provide the necessary purity of purification (less than 3 mg / dm 3 iron and manganese impurities) and are less expensive and can be cleaned more easily than membranes with a lower filtration rating.

[0044] The technical result is achieved by the fact that the storage tank for ozonation, which ensures the collection of water from the static mixer, is connected to the settling tank, which ensures the supply of ozonized water for purification. The technical result is achieved by the fact that the upper part of the settling tank is connected to the tank for collecting residual ozone, which ensures the collection of residual ozone for its further use, including for the purposes of oxidation of impurities.

[0045] The technical result is achieved by the fact that the excess ozone is reused for ozonation, which reduces its overall consumption. Structurally, this can be implemented by feeding the excess ozone from the upper part of the settling tank to the ozone generator.

[0046] The technical result is achieved in that the storage tank for ozonation, which ensures the collection of water from the static mixer, can be equipped with a stirrer, which ensures the elimination of sedimentation in the storage tank for ozonation and better oxidation of impurities due to mixing.

[0047] The technical result is achieved in that the storage tank for ozonation, which ensures the collection of water from the static mixer, can be connected to the water supply line for purification, which ensures the supply of water entering the purification directly into the tank for ozonation, and then from the tank for ozonation into the ejector for carrying out ozonation, thereby ensuring:

[0048] 1. Possibility of simplifying the design by eliminating part of the water supply line for purification, which provides direct supply of water entering the purification into the ejector for ozonation.

[0049] 2. Correction of ozone concentration in the storage tank for ozonation by adding non-zonated water.

[0050] 3. Water entering the ozonation storage tank undergoes partial oxidation of impurities before being fed into the ozonation ejector due to the presence of ozone in the ozonation tank, which allows for more efficient use of ozone for oxidation.

[0051] Description of drawings.

[0052] Fig. 1. General diagram of the water purification plant.

[0053] Fig. 2. General diagram of a water purification plant with a storage tank for ozonation.

[0054] Fig. 3 General diagram of a water purification plant with a storage tank for ozonation and water supply for purification.

[0055] Fig. 4. Scheme of the water purification plant. Example 1.

[0056] Fig. 5. Scheme of the installation for water purification. Example 2. In the most general form, reagent-free purification of water from iron and manganese according to the present invention is carried out as follows.

[0057] Contaminated water is directed to the ejector with simultaneous supply of ozone to it, where due to the increase of the channel cross-section in the ejector a rarefaction zone is created, where ozone is sucked in, which ensures uniformity of its supply and distribution in the water flow, from the ejector the water saturated with ozone enters the static mixer, where additional mixing of the flow occurs, which increases the efficiency of oxidation due to the increased uniformity of ozone distribution in the volume of water, from the static mixer the water enters the settling tank for sedimentation, where sedimentation occurs in the form of iron and manganese oxides, the settling tank is made in the form of a container with a conical bottom, which has an outlet for unloading the sediment, for example, using a screw, into the tailings storage facility. Excess ozone is removed from the upper part of the settling tank into a thermal catalytic destructor.From the settling tank, water enters the filtration unit with disc filters, where the last filter has a filtration rating of 20 μm, which ensures the removal of most of the insoluble impurities, including manganese and iron oxides. After the filtration unit with disc filters, water enters the tangential flow filtration using the cross-flow method, a filter element with a filtration rating of 0.2 μm is used, and the solutions are separated into a concentrate rich in impurities and permeate in the form of purified water, which enters the tank for purified water, the concentrate is discharged into the settling tank.

[0058] Water purification can be carried out in the manner specified, but is not limited to it.

[0059] In its most general form, the diagram of the installation for implementing the method is shown in Fig. 1 and includes: an ozone generator (1), an ozone supply line (2), a water supply pump (3), a water supply line (4), an ejector for mixing water with ozone (5), a static mixer (6) located after the ejector, a sedimentation tank for settling sediment (7), a disc filtration unit (8) equipped with a filter with a filtration rating of 20 μm, a tangential microfiltration circuit (9), and a container for collecting purified water (10).

[0060] In general, the installation for implementing the method can be implemented according to the diagram shown in Fig. 2, and additionally include a storage tank for ozonation (11), into which ozonized water can flow from a static mixer, wherein the storage tank for ozonation is connected to the water supply line to the ejector, which provides the possibility of feeding water from the storage tank for ozonation to the ejector, the storage tank for ozonation is connected to a settling tank, which provides the supply of ozonized water from the tank for ozonation to the settling tank.

[0061] In the installation for implementing the method, the water supply line for purification can be connected to the storage tank for ozonation, while the water supply line for purification may not be connected to the ejector; this version of the installation is shown in Fig. 3.

[0062] The said water purification plant can be implemented using the stated elements, but is not limited to them.

[0063] For a more detailed disclosure of the essence of the invention, examples of its implementation are given.

[0064] Example 1.

[0065] For water purification, an installation was mounted according to the diagram shown in Fig. 4. The installation included: an ozone generator (1), an ozone supply line (2), a water supply pump (3), a water supply line (4), an ejector for mixing water with ozone (5), a static mixer (6) located after the ejector, a sedimentation tank for sedimentation (7), a disc filtration unit (8), a tangential microfiltration circuit (9), a container for collecting purified water (10), a thermal catalytic ozone destructor (12), an oxygen production unit (13), and a sediment discharge system (14).

[0066] The purification of formation water with a manganese content of 207 mg / l and iron of 145 mg / l was carried out. The purification of water from iron and manganese was carried out as follows.

[0067] Oxygen was obtained using an oxygen production unit (13) by the short-cycle adsorption method using zeolite; the oxygen flow was directed to an ozone generator (1), in which a barrier discharge was used to produce ozone.

[0068] A water flow was fed for purification via the water supply line (4) to the ejector (5), where ozone from the ozone generator (1) was fed via the ozone supply line (2), the ozone was dosed, the water flow with ozone from the ejector was fed to the static mixer (6), from where the water was fed to the settling tank for sedimentation (7), the precipitated sediment was removed from the settling tank by the sediment discharge system (14), excess ozone from the settling tank was discharged to the thermal catalytic ozone destructor (12). Water from the settling tank (7) was fed to the disk filtration unit (8), which was made in the form of two disk filters installed in series with a filtration rating of 50 and 20 (last filter) μm.

[0069] As the disk filters became dirty, they were backwashed. The condition for backwashing was achieving a pressure drop of more than 2 kgf / cm 2 .

[0070] From the filtration unit (8), water entered the tangential microfiltration circuit (9), where permeate was obtained, which was sent to a container for collecting purified water (10) and a concentrate rich in impurities was obtained, which was sent to a settling tank (7).

[0071] At the stage of tangential filtration by the cross-flow method, membranes with a filtration rating of 0.2 µm were used. To clean the membranes, air cleaning was periodically carried out in reverse flow to restore productivity.

[0072] Ozone consumption was controlled at the minimum level required for effective oxidation of impurities. Filters were cleaned without dismantling or disassembling them. Purified water contained 2.7 mg / l of iron and manganese (total).

[0073] Example 2.

[0074] For water purification, an installation was mounted according to the diagram shown in Fig. 5, the installation included: an ozone generator (1), an ozone supply line (2), a water supply pump (3), a water supply line (4), an ejector for mixing water with ozone (5), a static mixer (6) located after the ejector, a sedimentation tank for sedimentation (7), a disc filtration unit (8), a tangential microfiltration circuit (9), a tank for collecting purified water (10), an ozonation storage tank (11), a thermal catalytic ozone destructor (12), an oxygen production unit (13), and a sediment discharge system (14).

[0075] Three parallel connected ejectors were used, with a static mixer installed after each ejector.

[0076] The purification of formation water with a manganese content of 205 mg / l and iron of 142 mg / l was carried out. The purification of water from iron and manganese was carried out as follows.

[0077] Oxygen was obtained using an oxygen production unit (13) by the short-cycle adsorption method using zeolite; the oxygen flow was directed to an ozone generator (1), in which a barrier discharge was used to produce ozone.

[0078] A water flow was fed for purification via the water supply line (4) to the ozonation storage tank (11), from where the water was directed to the ejectors (5), where ozone from the ozone generator (1) was fed via the ozone supply line (2), the ozone was dosed, the water flow with ozone from the ejectors was fed to the static mixers (6), from where the water was fed to the ozonation storage tank (11), the oxidation-reduction potential and pH of the water in the ozonation storage tank were monitored, from the ozonation storage tank (11) the water was fed to the sedimentation tank (7), the precipitated sediment was removed from the sedimentation tank by the sediment unloading system (14), the excess ozone from the sedimentation tank was discharged to the thermal catalytic ozone destructor (12). Water from the sedimentation tank (7) was fed to the disk filtration unit (8), which was made in the form of three disk filters installed in parallel with a filtration rating of 20 μm.

[0079] As the disk filters became dirty, they were backwashed. The condition for backwashing was achieving a pressure drop of more than 2 kgf / cm 2 .

[0080] From the disc filtration unit (8), water entered the tangential microfiltration circuit (9), where permeate was obtained, which was sent to a container for collecting purified water (10) and a concentrate rich in impurities was obtained, which was sent to a settling tank (7).

[0081] At the stage of tangential filtration by the cross-flow method, membranes with a filtration rating of 0.2 μm were used. To clean the membranes, water-air back-flushing was periodically carried out to restore productivity.

[0082] Ozone consumption was controlled at the minimum level necessary for effective oxidation of impurities. Filters were cleaned without dismantling or disassembling them.

[0083] The purified water contained 2.4 mg / L of iron and manganese (combined).

[0084] Example 3.

[0085] Water purification was carried out in a similar manner to Example 2, with the difference that the water supply line was additionally connected directly to the ejector, with part of the water being supplied directly to the ejector, and part of the water to the storage tank for ozonation.

[0086] The purified water contained 2.4 mg / l of iron and manganese (combined).

[0087] Example 4.

[0088] Water purification was carried out in a manner similar to Example 2, with the difference that excess ozone was additionally removed from the upper part of the storage tank for ozonation (I) into a thermal catalytic ozone destructor (12).

[0089] The purified water contained 2.4 mg / L of iron and manganese (combined).

[0090] Example 5.

[0091] Water purification was carried out in a manner similar to Example 2, with the difference that the storage tank for ozonation (11) was equipped with a stirrer, which eliminated sedimentation in the storage tank for ozonation and improved the mixing of ozone in the water.

[0092] The upper part of the settling tank was connected to a residual ozone collection tank, the residual ozone collection tank was connected to an ozone generator, which provided excess ozone to the ozone generator.

[0093] The purified water contained 2.35 mg / L of iron and manganese (combined). Sources of information used.

[0094] 1. US4780215A. IPC C02F 1 / 78. Water purification device / Russell L. Carlson / Application dated 06 / 08 / 1987. Published 10 / 25 / 1988.

[0095] 2. SU1546435A1. IPC C02F 1 / 56, C02F 1 / 78, C02F 1 / 56, C02F 101 / 20, C02F 103 / 00. Method for purifying water from manganese and iron compounds / Tarasevich Yu.I., Kravchenko V.A., Korostyshevsky A.S., Pazyura V.S., Rudenko G.G., Polyakov V.E. Application dated 12 / 08 / 1987. Publ. 02 / 28 / 1990.

[0096] 3. RU2105729C1. C02F 1 / 64. Method for cleaning groundwater from iron and manganese / Fomin S.N., Antonov L.A. Application dated 03.10.1996. Published 27.02.1998.

[0097] 4. RU2624643C2. C02F 9 / 00, C02F 1 / 00, C02F 1 / 28, C02F 1 / 32, C02F 1 / 36, C02F 1 / 463, C02F 1 / 465, C02F 1 / 467, C02F 1 / 52, C02F 1 / 78, BOID 21 / 00. Method and device for electrochemical treatment of industrial wastewater and drinking water / Oreshchanin V., Mikulich N., Petlyak D. Application dated 27.03.2013. Published 25.04.2017.

[0098] 5. CN101224928A. C02F 9 / 04, C02F 1 / 78, C02F 1 / 52. Water purification process / Changchun, Yang Yufan, Dong Bingzhi, Gao Naiyun, Keiichi Ikeda. Application dated 17.01.2007, Published 23.07.2008.

[0099] 6. CN110372131A. C02F9 / 00. Methods and devices for deep purification of manganese-containing groundwater / Ji Changqing, Zhuang Rongchuan, Wang Qiankun, Xiao Qin, Qiu Yaoxing, Chen Zhengxian, Wang Hong / Application dated 23.08.2019. Published 25.10.2019.

Claims

CLAUSE OF INVENTION 1. A method for non-reagent purification of water from iron and manganese, including treating water with ozone by mixing water and ozone in an ejector, mixing water and ozone in a static mixer and subsequent filtration, characterized in that after treatment with ozone, water is sent to a settling tank for sedimentation, from the settling tank the water is sent for filtration using at least one disc filter with a filtration rating of at least 20 μm, and then for tangential microfiltration using the cross-flow method.

2. The method according to paragraph 1, characterized in that ozone is obtained in a barrier ozonizer from oxygen.

3. The method according to paragraph 2, characterized in that oxygen for producing ozone is obtained by isolating it from the air using zeolite.

4. The method according to item 1, characterized in that ozonation is carried out by recirculating water through an ejector.

5. The method according to item 1, characterized in that the excess ozone is passed through a thermal catalytic ozone destructor.

6. The method according to claim 1, characterized in that the excess ozone is reused for ozonation.

7. The method according to claim 1, characterized in that after ozonation and before the precipitation stage, the oxidation-reduction potential and pH are measured.

8. The method according to claim 1, characterized in that several disk filters are used in order of decreasing filtration rating, with the last filter used being one with a filtration rating of 20 µm.

9. The method according to item 1, characterized in that at least one disk filter is washed from contaminants in a direction opposite to filtration.

10. The method according to claim 1, characterized in that tangential microfiltration by the cross-flow method is carried out using a filter with a filtration rating of 0.2 μm.

11. A device for implementing the method according to claim 1, comprising an ozone generator, an ozone supply line, a water supply pump, a water supply line, an ejector for mixing water with ozone, a static mixer located after the ejector, a water filtration system and a container for collecting purified water, characterized in that it additionally comprises a settling tank for sedimentation, which is connected to the filtration system, wherein the filtration system comprises at least one disc filter with a filtration rating of at least 20 μm and at least one tangential microfiltration filter installed after the disc filter and providing tangential microfiltration using the cross-flow method.

12. The device according to item 11, characterized in that the device additionally includes a storage tank for ozonation, into which ozonized water can flow from a static mixer, wherein the storage tank for ozonation is connected to a water supply line to the ejector, which provides the possibility of feeding water from the storage tank for ozonation to the ejector, the storage tank for ozonation is connected to a settling tank, which provides the supply of ozonized water from the tank for ozonation to the settling tank.

13. The device according to item 12, characterized in that the water supply line for purification is connected to the storage tank for ozonation.

14. The device according to item 12, characterized in that it includes a thermal catalytic ozone destructor connected by a channel to the upper part of the settling tank.

15. The device according to item 14, characterized in that the thermal catalytic ozone destructor is connected to the upper part of the storage tank for ozonation.

16. The device according to item 12, characterized in that the storage tank for ozonation is equipped with a stirrer.

17. The device according to item 11, characterized in that the ozone generator is made in the form of a barrier ozonizer.

18. The device according to item 11, characterized in that it includes a unit for obtaining oxygen from air using zeolite, which is connected to an ozone generator.

19. The device according to item 11, characterized in that the upper part of the settling tank is connected to the air supply channel to the ozone generator.

20. The device according to item 11, characterized in that the upper part of the settling tank is connected to a container for collecting residual ozone.

21. The device according to item 11, characterized in that the settling tank is equipped with a sediment discharge system.

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