RU2490217C2 - Method of integrated drinking water treatment - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to multistage recycled water treatment and may be used for purification of drinking water and effluents. Proposed method comprises flotation treatment of water in flotation cell 2 by air-water mix fed from ejector 3, bubble-film extraction of surfactants by extractor 4, discharge of purified water and removal of surfactants. Water is treated in at least one treatment module 1 with at least one circular cleaning cycle. Said cycle comprises water filtration through sand bulk filter 5 and its discharge with the help of suction drain means 6. It includes also bactericidal treatment in UV radiator 7 and flotation treatment of clarified water. Besides it comprises bubble-film extraction of surfactants, biological cleaning in aerobic reactor 8 filled with activated carbon with colonies of aerobic heterotrophs and feeding water for recycling. Purified water is discharged after multiple recycling.

EFFECT: higher quality of water purification.

4 cl, 2 dwg, 1 tbl

Description

The invention relates to the field of multi-stage water treatment, in particular to the technology of recirculating water treatment by flotation in combination with other treatment methods (methods), and can be used for purification of drinking water in the home and the food industry, as well as for the post-treatment of industrial and waste waters of industrial enterprises .

The prior art various methods of purification of drinking water, for example, including filtration, biological treatment with microorganisms, bactericidal treatment with UV radiation and their combinations, for example, implemented in the following technical solutions:

"The method of purification of drinking water" RU 2174956 (C2) (V. Yeremeyeva and others) C02F 1/28, 1/68 // C02F 103: 04, 10.20.2001 [1];

“The method of water disinfection” SU 1679747 (A1) (Omsk Agricultural Institute named after S. M. Kirov) C02F 1/74, 3/00, 01/10/1996 [2];

“A method of producing drinking water” RU 2182128 (C1) (000 Cosmo-Design International C02F 1/50, 1/32, 1/76 // C02F 103: 04, 05/10/2002 [3]:

“The method of producing drinking water” RU 2220115 (C1) (Federal State Unitary Enterprise “Perm Plant named after S.M. Kirov” C02F 9/12 // (C02F 9/12, 1:28, 1:32, 1:52 , 1:56, 1:72), 103: 04; 12/27/2003 [4];

"The method of water purification and a modular device for its implementation" RU 2151106 (C1) (K. Bogolitsyn and others) C02F 9/14 // (C02F 9/14, 1:78, 1: 463), 103-04; 06/20/2000 [5];

"Installation of drinking water" RU 2209783 (C3) (K. Bogolitsyn) C02F 9/14 // (C02F 9/14, 1:28, 1:78, 3:00), 103: 02, 08/10/2003 [6].

However, the known methods [1-6] do not provide a high degree of purification of drinking water from the spectrum of their pollution.

An economical method for purifying water by flotation has also found distribution, for example, implemented in the following technical solutions:

"Installation for the purification of water of surface-active cysts" UA 19391 (C2) (Gevod B.C.), C02F 1/24, 12/25/1997 [7];

“Installation for hyblock water purification” UA 23032 (C2) (Gevod B.C.), C02F 1/24, 06/30/1998 [8];

“Pristroy for water purification” UA 25068 (C2) (Institute of Collegiate Chemistry, named after A.I. Dumansky National Academy of Sciences of Ukraine, UA) C02F 1/24, C02F 1/40, 12/25/1998 [9].

Known methods in [7-9] also do not provide a high degree of purification of drinking water from the spectrum of their pollution.

Closest to the invention by the number of common features is a method of deep water purification, mainly drinking, in which treatment is carried out in a purification module, including flotation treatment of the purified water in the flotator with an air-water mixture coming from the ejector, bubble-film extraction of surface-active substances using bubble film extractor, as well as the withdrawal of purified water and the removal of surface-active substances, implemented in the device ["Installation for purification of water and flotation" UA 5807 6 (A) (Gevod B.C. taranshi) C02F 1/24, 07/15/2003; the closest analogue is the prototype] [10].

The disadvantage of this method [10] is that they do not provide the necessary degree of purification (post-treatment) of water over the entire spectrum of contaminants to be removed, which reduces the quality of the water.

This is caused by the fact that in this way only flotation and bubble-film extraction of surfactants is carried out.

The problem to which the invention is directed is to improve the known method by applying additional methods (stages) of water purification in it, providing its multi-stage treatment by a closed repeatedly repeated cycle in the cleaning module (unit) with the effect of activating individual water purification processes on each shoe (stage) ) recirculation water treatment technology.

The technical result that is achieved when solving the problem and using the improved method is to increase the degree of purification (post-treatment) and water quality.

The problem is solved, and the technical result is achieved by the fact that in the method of deep purification (post-treatment) of water, predominantly drinking water, in which the water is treated in one cleaning module (unit), including flotation treatment of the purified water in the flotator with an air-water mixture coming from the ejector, bubble-film extraction of surface-active substances (surfactants) using a bubble-film extractor (PES), as well as the withdrawal of purified water and the removal of surfactants, according to the invention, perform a comprehensive cleaning cu (tertiary treatment) of water in at least one cleaning module (unit), including at least one ring multistage cycle of water treatment (tertiary treatment), in which additionally filter water through a bulk sand filter, after which filtered water is removed using a drainage-suction agent and serves for bactericidal treatment of water in an ultraviolet irradiator (UV irradiator), after which flotation treatment of clarified water in the flotator is performed with a water-air mixture from ezh ctor and bubble-film extraction of surface-active substances (surfactants) using a bubble-film extractor (PES), and then additionally perform biological treatment of water in an aerobic bioreactor with a load consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, after which perform a repeated supply of water to the next ring multistage cycle of water treatment - recirculation, while the output of purified water is performed after repeated recirculation.

At the same time, water filtration through a bulk sand filter, bactericidal treatment of water in an ultraviolet irradiator (UV irradiator), flotation treatment of purified water in a flotator with a water-air mixture coming from an ejector accompanied by bubble-film extraction of surface-active substances (surfactants) using a bubble-film extractor (PES), and biological treatment of water in an aerobic bioreactor with a charge consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, perform the last It is essential in each ring multistage cycle of water purification (post-treatment) in the purification module (unit).

In addition, when filtering water through a bulk sand filter, the filtered water is discharged using a drainage and suction means, which is implemented as a perforated box-shaped nozzle buried in a bulk sand filter, equipped with a pump, which is installed inside or outside the cleaning module (unit).

With a large consumption of purified water, the cleaning modules are connected in parallel.

Due to the fact that in the inventive method, a complex purification (post-treatment) of water is performed in at least one purification module, including at least one ring multistage water purification (post-treatment) cycle, thereby providing a combined process recycling (purification) of water by various, but complementary methods, which on the one hand allow the possibility of minimizing the dimensions of the cleaning module (unit) and its functional units, and on the other hand initiate the occurrence feedbacks between the used composite processes of recirculation technology, which optimize the process of effective water treatment.

Filtration of water in the starting and subsequent cycles through a bulk sand filter ensures the separation of solid (dispersed) and liquid phases by sedimentation and colloidal impurities of water in the pore space of the sand filter under the influence of gravity and pressure drop. Filtration mainly traps particles in the thickness of the filter medium. The speed of local water flows in the loading space covers the modes of "fast" and "slow" filtration. This ensures the effective removal from water of those substances that determine the indicator "turbidity".

The withdrawal of filtered water using a drainage-suction agent and its supply for bactericidal treatment in an ultraviolet irradiator (UV irradiator) ensures sterilization of the circulating and output water flows by a UV irradiator equipped with bactericidal lamps of the corresponding power. Sterilization is achieved due to DNA destruction in the cells of bacterial microflora, in viruses, in spores of fungi and microalgae under the influence of ultraviolet light quanta (for example, with a wavelength of 264 nm), which increases the degree of water purification.

After bactericidal treatment, the stream of clarified and sterilized water in the flotator is mixed with the stream of air bubbles produced by the ejector. This ensures the accumulation of adsorbed and absorbed water impurities on the surface and in the volume of bubbles of ejected air and they move with air bubbles from the volume of water into the space of the bubble-walled extractor (PES), and then in the form of thin films of flotation products of microbial metabolism and other surface active water pollution, the flotation concentrate is removed from the water volume of the water treatment unit through the space of a bubble-walled extractor (PES) . That is, in the flotator there is an exchange absorption of volatiles of water, in which air bubbles remove chlorine, chloroform, methane, ammonia, hydrogen sulfide and other toxic volatiles from the water, the concentration of which in water is higher than in the atmosphere and at the same time saturate the water with atmospheric oxygen. Bubbles also adsorb on their surface truly dissolved and colloidal surface-active substances (surfactants) of water (molecules of proteins, lipids, synthetic detergents, their micelles and complex compounds with cations of heavy and polyvalent metals) and deliver them to a bubble-film extractor (PES) . In a bubble-film extractor (PES), these impurities in the form of films are brought up and surface-active substances (surfactants) are concentrated in a limited water volume and in the form of liquid waste water treatment and are removed as they accumulate.

Due to the fact that the water after flotation treatment is additionally supplied for biological treatment in an aerobic bioreactor with a charge consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, this ensures the final stage of purification of one cycle of water treatment. The aerobic bioreactor is a flow tube loaded from granular mesoporous activated carbon. Colonies of aerobic heterotrophs biocatalytically clean the flow of circulating water from organic and mineral surfactants that serve as nutrition components for the growth and reproduction of this type of microorganism. Aerobic heterotrophs in nature are the main factors in the self-purification of water spaces and therefore significantly increase the degree of water purification.

A feature of the recirculation system of combined water treatment is that, on the one hand, such a system allows the possibility of minimizing the dimensions of its functional units, and, on the other hand, it provides feedback that optimizes its operation as a whole.

So, if a typical direct-flow sand filter has a height h and at a given filtration rate provides a ten-fold decrease in the turbidity of the filtered solution, then a filter with a height of 0.1 h provides the same decrease in turbidity of the solution in the recirculation process when the number of recirculation cycles in this system reaches ten.

Similarly, the intensification of the cleaning process occurs during flotation.

During operation of the recirculation filtration-flotation system, the residual concentration of the ith type of impurity in the treated multicomponent aqueous solution can be reduced to any desired level, since the kinetics of the removal of substances obeys the inverse exponential law.

During recirculation filtration, the basic mechanisms of separation of substances from the filtered liquid during biological treatment of water in an aerobic loading bioreactor remain the same as in any other granular filter. In particular, coarse impurities are deposited on the surface of the filter with the formation of "bridge" structures and loose sediment, partially blocking the cross section of the mouths of the inlet pores of the filter. Colloidal particles form a coagulum inside the filter by the mechanisms of inertial and inertia-free heterocoagulation.

But a distinctive feature of the operation of the granular filter in the aerobic bioreactor in recirculation mode, together with a flotator and a bubble-film extractor (PES), is the fact that a solution enriched with atmospheric oxygen continuously enters the pore space of the charge, consisting of activated carbon (due to exchange absorption during flotation in a flotator). At the same time, this solution is depleted of surface-active inhibitors of microbial metabolism due to the operation of the bubble-film extractor (PES).

The saturation of the filtered stream with atmospheric oxygen and the removal of surface-active inhibitors of microbial metabolism from it also stimulates the activity of biofouling during filtration through a bulk sand filter inside the sand mass and thereby turns it into a biofilter and bioreactor.

Thus, positive feedbacks between the functional units of the filtration-flotation complex are realized.

The contribution of these components to the “productivity” of recirculation filtration depends on the age and species composition of biofouling on sand grains, as well as on the presence of substances serving as substrates for bacterial nutrition in the filtered stream.

Bio-fouling absorbs from the stream of filtered fluid those organic substances that are easily absorbed by the enzymatic systems of bacterial cells. As these substances are disposed of, bacteria begin to “digest” more complex organic compounds. In this case, the water flow at the outlet of the filter and the bioreactor is additionally purified from dissolved organic compounds. At the same time, waste products from bio-fouling enter the output stream from the sand filter and the bioreactor. These are carbon dioxide, water, endogenous surfactants, as well as difficult to decompose fragments of dying bacterial colonies. A bubble-film extractor (PES) is evacuating them from the recirculating volume of the aqueous phase.

The improved method provides for the removal from the volume of the recirculating aqueous phase a combination of substances that belong to different classes according to the degree of dispersion and nature of origin. These include organic and inorganic substances, sedimenting and non-sedimenting, colloidal and truly dissolved surface-active and inactive, as well as volatile organic compounds and gases. And the output streams of water are subjected to the aforementioned sterilization by UV irradiators equipped with bactericidal lamps of the corresponding power.

The invention is further illustrated by drawings and a description of an example of its implementation.

Figure 1 schematically shows a device for deep purification (post-treatment) of water, mainly drinking, in which the inventive method is implemented.

Figure 2 schematically shows several devices for deep purification (post-treatment) of water, connected in parallel.

The proposed method is implemented in a device for deep purification (post-treatment) of water, mainly drinking (Fig.1, 2).

A device for deep purification (post-treatment) of water, primarily drinking water, contains a cleaning module (unit) 1, inside which there is a flotator 2, inside of which a water-air mixture is pumped from the ejector 3, a bubble-film extractor (PPE) 4 located above the flotator and serving for the extraction and removal of surface active substances (surfactants). Inside the cleaning module 1, there is a bulk sand filter 5, connected by means of a drainage-suction means 6 with an ultraviolet irradiator (UV irradiator) 7, which is connected to an ejector 3. UV irradiator 7 can be installed outside or inside the cleaning module 1. Drainage-suction the means 6 is made in the form of a perforated drainage box nozzle 9 buried in a bulk sand filter 5, equipped with a pump 10, which can be installed inside or outside the cleaning module 1.

The cleaning module (unit) 1 has an inlet pipe 11 with a faucet 12 for supplying source water for purification, an output pipe 13 with a faucet 14 for outputting purified water and coupled to the output of a UV irradiator 7, a drain pipe 15 for removing surface-active substances (surfactants) associated with a bubble-film extractor (PES) 4, the inlet pipe 16 of the ejector 3 for ejecting air from the atmosphere, the inlet pipe 17 of the ejector 3 for supplying water from the ultraviolet irradiator (UV irradiator) 7 and the outlet pipe 18 of the ejector 3 introduced inside the flotator 2 d For supplying a water-air mixture and flotation.

The method of deep purification (post-treatment) of water, primarily drinking water (Fig. 1, 2), in which the water is treated in one cleaning module (unit) 1 (Fig. 1), in the general case, includes flotation treatment of the water to be purified in the flotator 2 with an air-water mixture coming from the ejector 3, the extraction of surface-active substances (surfactants) using a bubble-film extractor (PES) 4, as well as the withdrawal of purified water and the removal of surface-active substances (surfactants).

A feature of the method is that they perform a comprehensive purification (post-treatment) of water in at least one purification module 1 (Fig. 2), including at least one annular multistage water purification (post-treatment) cycle, in which additionally filtering is performed water through a bulk sand filter 5 (Fig. 1), after which the filtered water is discharged using a drainage-suction means 6 and fed to the bactericidal treatment of water in an ultraviolet irradiator (UV irradiator) 7.

After that, flotation treatment of clarified water in flotator 2 is carried out with a water-air mixture coming from the ejector 3, and the extraction of surface-active substances (surfactants) using PES 4.

And then additionally carry out biological water purification in the aerobic bioreactor 8 with a load consisting of activated carbon with colonies of aerobic heterotrophs incubated in it.

After this, a repeated water supply is performed to the next ring multistage water treatment cycle - recirculation, while the output of the purified water is performed after repeated recirculation.

Filtration of water through a bulk sand filter 5, bactericidal treatment of water in an ultraviolet irradiator (UV irradiator) 7, flotation treatment of purified water in a flotator 2 with a water-air mixture coming from an ejector 3 accompanied by bubble-film extraction of surface-active substances (SAS) using bubble a film extractor (PES) 4, and biological treatment of water in an aerobic bioreactor 8 with a charge consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, perform the following It is essential that in each ring multistage cycle of water purification (post-treatment) in the purification module (unit) 1.

When filtering water through a bulk sand filter 5, the filtered water is discharged using a drainage and suction means 6, which is implemented as a perforated box-shaped nozzle 9 buried in a bulk sand filter 5, equipped with a pump 10, which is installed inside or outside the cleaning module 1.

The feed water for purification to the cleaning module 1 is supplied through the inlet pipe 11 provided with a tap 12, the purified water is discharged through the outlet pipe 13 equipped with a tap 14 and coupled to the output of the UV irradiator 7, surface-active substances (surfactants) are removed through a drain a pipe 15 connected with a bubble-film extractor (PES) 4, the air is sucked from the atmosphere into the ejector 3 through the inlet pipe 16, the water supply from the UV irradiator 7 is carried out through the inlet pipe 17, and the air-water supply of the mixture to flotation from the ejector 3 to the flotator 2 is carried out through the outlet pipe 18 of the ejector 3.

With large water consumption, the cleaning modules 1 are connected in a parallel circuit (figure 2).

When the water purification technology is implemented in the proposed recirculation version, then in the recirculation process chain a sand filter 5, an aerobic bioreactor 8 with a load consisting of activated carbon, a flotator 2 and a bubble-film extractor (PES) 4, connected in series and operating in a recirculation mode, are amplified each other's functions. That is, the saturation of the water flow with atmospheric oxygen in the flotator 2 stimulates the microflora biofiltration activity in the pore loading space, consisting of activated carbon, in the aerobic bioreactor 8 and in the sand filter 5. Moreover, the concentration of surface-active substances (surfactants) - products of microbial metabolism at the inlet in a bubble-film extractor (PES) 4 increases. These substances are natural flocculants. They provide aggregation of colloidal particles in the purification module 1, facilitating their evacuation through a bubble-film extractor (PES) 4 and thereby reduce or completely eliminate the use of synthetic flocculants.

During flotation, the products of microbial metabolism, along with other impurities, are continuously removed from the recycle liquid stream through a bubble-film extractor (PES) 4. As a result, one more positive feedback is realized in the flotation-filtration system. Its essence lies in the fact that microbial metabolites, when accumulated in the environment of the existence of bacteria, inhibit cell activity according to the laws of chemical kinetics. And according to the same laws, bacterial activity increases when the products of bacterial metabolism are removed from the incubation medium. Therefore, a sand filter 5 and an aerobic bioreactor 8 with a load consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, a flotator 2 and a bubble-film extractor (PES) 4, functioning in a recirculation version, provide each other with additional separation capabilities due to a synergistic effect . In other words, biofouling in a granular sand filter 5 and in an aerobic bioreactor 8, that is, in its load consisting of activated carbon, enrich the filtrate with substances that are natural flocculants and thereby ensure flotation efficiency in flotator 2 and bubble-film extraction of surface active substances (surfactants) in a bubble-film extractor (PES) 4. A bubble-film extraction, the principle of which is associated with the saturation of the water flow with atmospheric oxygen and removal of life products from it bacterial activity, enhances the biofilter. This continues until the nutrition components for biofouling are exhausted in the volume of the recirculating liquid.

But on this the advantages of the recirculation technology for purification (post-treatment) of water are not exhausted. A very important circumstance is that in the recirculation water treatment technology there is no need to use several series-connected filters. The function of the cumbersome filter chain here is provided by one small-sized filter. With the optimal area of the dividing surfaces in the pore space of this filter, the absorption of substances in its working volume occurs simultaneously by mechanisms of blocking the bore of the pores, gravitational deposition, inertial and inertia-free heterocoagulation, bioprecipitation and biocatalysis. The total degree of removal of impurities from the volume of treated water in this case obey the equation:

$$\frac{C}{C_0}=\exp \left(-\frac{k\tau }{V}\right),\left(\mathrm{one}\right)$$

where C is the concentration of water impurities after processing;

With ₀ - the initial concentration of water impurities;

k is the generalized rate constant for water treatment;

τ - the duration of the recirculation mode of water treatment

V is the volume of treated water.

The quality indicators of water purified by the claimed method are shown in table 1.

Table 1 No. p / p Name of indicator Source water Purified water Norm one Chromaticity, degree (°) of platinum-cobalt scale 20-50 <5 twenty 2 Smell, points 2-3 one 2 3 Turbidity, mg / dm ³ 4-14 <0.5 1,5 four PH value 7.25 ± 0.3 7.32-8.5 6.0-9.0 5 Taste and taste, points 2-3 one 2 6 Residual chlorine (Cl), mg / dm ³ 1,2 <0.3 0.8-1.2 7 Chloroform (CHCl ₃ ), mg / dm ³ 0.1 - 0.06 8 Carbon tetrachloride (CCl ₄ ), mg / dm ³ 0.004-0.006 - 0.005 9 Nitrates (HNO ₃ ), mg / dm ³ 4.0 ± 0.5 <2 45.0 10 Nitrites (NaNO ₂ , HNO ₂ ), mg / dm ³ 0.0031 <0.002 3.0 eleven Aluminum (Al), mg / dm ³ 0.24 ± 0.02 <0.05 0.5 12 Iron (Fe), mg / dm ³ 3.0-14.0 <0.01 0.3 13 Cadmium (Cd), mg / dm ³ 0,0005 - 1.001 fourteen Manganese (Mn), mg / dm ³ <0.001 <0.001 0.1 fifteen Copper (Cu), mg / dm ³ 0.06 ± 0.001 0.04 ± 0.001 1,0 16 Strontium (Sr), mg / dm ³ 0.103 <0.09 2.0 17 Ammonia (NH ₃ ), mg / dm ³ <0.04 - 2.0 eighteen Surfactant (surfactants), mg / DM ³ 3.0 <0.025 1,0 19 SPAS (synthetic surfactants), mg / DM ³ 0.5 <0.04 0 twenty Arsenic (As), mg / dm ³ 0.005 ± 0.0001 - 0.05 21 Permanganate oxidation, mg O ₂ / dm ³ 8.12 <3 - 22 TBC (total microbial number), the number of bacterial colonies per 100 ml 63-630 - one hundred 23 Coli index, the number of bacteria Coli per 100 ml 100,000 <3 <3

From table 1 it is seen that the quality indicators of drinking water purified (purified) by the claimed improved method, in which filtering water through a bulk sand filter 5, bactericidal treatment of water in an ultraviolet irradiator (UV irradiator) 7), flotation treatment of purified water in a flotator 2 water-air mixture coming from the ejector 3 accompanied by bubble-film extraction of surface-active substances (surfactants) using a bubble-film extractor (PES) 4, and biological treatment of water in aerobic b and a reactor 8 with a load consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, is performed sequentially in each ring multistage cycle of water purification (post-treatment) in the purification module (unit) 1, drinking water quality indicators meet or exceed the normative and technical documentation.

The above information confirms the industrial applicability of the claimed improved method for deep water purification (post-treatment), predominantly drinking, based on multi-stage water treatment by recirculating water treatment in at least one purification module, which can be widely used for drinking water treatment in household and food industry, as well as for the purification of technical and waste water of industrial enterprises.

List of designations:

1. cleaning module (unit)

2. flotator

3. ejector

4. bubble film extractor (PES)

5. bulk sand filter

6. drainage and suction agent

7. ultraviolet irradiator (UV irradiator)

8. aerobic bioreactor

9. perforated drainage box nozzle

10. pump

11. inlet pipe of the cleaning module (unit)

12. tap of the inlet pipe of the cleaning module (unit)

13. outlet pipe of the cleaning module (unit)

14. tap of the outlet pipe of the cleaning module (unit)

15. drain pipe to remove surface-active substances (surfactants) from a bubble-film extractor (PES)

16. inlet pipe of the ejector for ejection of air from the atmosphere

17. inlet pipe of the ejector for supplying water from the ultraviolet irradiator (UV irradiator)

18. the outlet pipe of the ejector to supply the air-water mixture into the flotator

Claims (4)

1. A method of deep water purification, mainly drinking, in which the water is treated in the purification module (1), including flotation treatment of the purified water in the flotator (2) with an air-water mixture coming from the ejector (3), bubble-film extraction of surface-active substances using a bubble-film extractor (4), as well as the withdrawal of purified water and the removal of surfactants, characterized in that they perform complex water treatment in at least one cleaning module (1), including at least the least, one ring multistage water treatment cycle, in which water is additionally filtered through a bulk sand filter (5), after which the filtered water is removed using a drainage-suction agent (6) and fed to the bactericidal treatment of water in an ultraviolet irradiator (7) then flotation treatment of clarified water in the flotator (2) is carried out with a water-air mixture coming from the ejector (3), and bubble-film extraction of surfactants using bubble-film extra ctor (4), and then additionally perform biological water purification in the aerobic bioreactor (8) with a charge consisting of activated carbon with colonies of aerobic heterotrophs incubated in it, and then re-supply the water to the next ring multistage water treatment cycle - recirculation, while the conclusion of the purified water is performed after repeated recirculation. 2. A method of deep water purification, mainly drinking, according to claim 1, characterized in that the water is filtered through a bulk sand filter (5), bactericidal treatment of water in an ultraviolet irradiator (7), flotation treatment of purified water in a flotator (2) with an air-water mixture coming from the ejector (3), accompanied by bubble-film extraction of surfactants using a bubble-film extractor (4), and biological treatment of water in an aerobic bioreactor (8) with a charge consisting of activated carbon with colo iyami aerobic heterotrophs, incubated therein, operate sequentially in each ring cycle multi-stage water purification in the stripping unit (1). 3. The method of deep water purification, mainly drinking, according to claim 1, characterized in that when filtering water through a bulk sand filter (5), the filtered water is discharged using a drainage-suction means (6), which is performed as buried in bulk sand a filter (5) of a perforated drainage box-shaped nozzle (9) equipped with a pump (10), which is installed inside or outside the cleaning module (1). 4. The method of deep water purification, mainly drinking, according to claim 1, characterized in that the cleaning modules (1) are connected in parallel.

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