Double-water-source water purification system based on CO2 pH regulation coagulation promotion technology

Abstract

The utility model discloses a double-water-source water purification system based on the technology of promoting coagulation by adjusting pH through CO2, which comprises a pre-ozone treatment tank, a flocculation sedimentation tank, a sand filter tank, an ozone activated carbon filter tank, an ultrafiltration membrane filter tank and a double-raw-water inlet pipe group arranged at one end, far away from the flocculation sedimentation tank, of the pre-ozone treatment tank, the water outlet pipe is arranged at one end, far away from the ozone activated carbon filter tank, of the ultrafiltration membrane filter tank; and the feeding mechanism is used for feeding carbon dioxide and oxygen into the water body. According to the utility model, raw water is subjected to multiple filtration and passing, and carbon dioxide can be added into the raw water and the pH value of the raw water can be adjusted through the adding mechanism according to the pH value of the raw water, so that the pH value of the raw water is reduced, the dissolution of an aluminum salt coagulant is reduced, and the concentration of aluminum ions in a water body is reduced, thereby promoting the flocculent precipitation effect of a flocculating agent; therefore, the safety of the membrane assembly and a human body can be protected, and a plurality of water sources can be treated and purified.

Description

Technical Field

[0001] This utility model relates to the field of water purification system technology, specifically to a dual-source water purification system based on CO2-based pH-regulating coagulation technology. Background Technology

[0002] With the increasing urban population, the demand for urban water resources is also growing. The existing water supply mainly comes from rivers, lakes, ponds and streams; in addition, urban wetlands can also serve as a source of water for residential use, industrial production and agricultural irrigation; reservoirs near urban areas also serve as a source of water for the city.

[0003] Currently, the water purification systems for various urban water sources are independent and do not interfere with each other. While this eliminates mutual influence between water sources, it also presents the following problems:

[0004] The water volume of natural water sources such as rivers and lakes is affected by seasonal and climatic conditions, with variations in dry and wet seasons. A single water source may not be able to meet the city's water supply needs during the dry season, and different water sources require different treatment processes. For example, when there are too many impurities in the raw water, the raw water only needs to have the impurities removed; however, some raw water has a large increase in pH value due to excessive algae, resulting in high aluminum concentration in the treated water. Therefore, in addition to removing algae, the pH value of the raw water needs to be adjusted.

[0005] Specifically, algae consume a large amount of carbon dioxide during their formation, which reduces the content of carbonate and bicarbonate in the water and significantly increases the pH of the water. Many water plants in China use aluminum salt coagulants (aluminum salt flocculants). Aluminum is an amphoteric substance and has a certain solubility under weakly alkaline conditions. In water purification processes, membrane treatment processes are set up downstream. High concentrations of aluminum ions can penetrate the membrane modules, leading to membrane damage and fouling. Furthermore, aluminum ions can affect human health.

[0006] Therefore, how to provide a water purification system that can treat dual or multiple water sources is a technical problem that urgently needs to be solved. Utility Model Content

[0007] The purpose of this invention is to propose a dual-source water purification system based on CO2-based pH-regulating coagulation technology, thereby solving the problem in the prior art that existing water purification systems cannot adjust and purify raw water according to the properties of multiple water sources.

[0008] To achieve the above objectives, this utility model proposes a dual-source water purification system based on CO2-based pH-regulating coagulation technology. The system includes a pre-ozone treatment tank, a flocculation sedimentation tank, a sand filter, an ozone activated carbon filter, and an ultrafiltration membrane filter connected in sequence. A dual raw water inlet assembly is located at the end of the pre-ozone treatment tank furthest from the flocculation sedimentation tank. An outlet pipe is located at the end of the ultrafiltration membrane filter furthest from the ozone activated carbon filter. A dosing mechanism for adding carbon dioxide and oxygen to the water is also provided.

[0009] Optionally, the pre-ozone treatment tank includes an ozone tank body, a connecting hole at the bottom of the ozone tank body, an ozone inlet pipe at the opening of the connecting hole, a booster pump on the ozone inlet pipe, an ozone storage tank connected to the inlet end of the booster pump, an ozone generator connected to the ozone storage tank, an installation pipe on the bottom surface of the ozone tank body connected to the connecting hole, an ozone one-way valve installed on the installation pipe, and an ejector installed on the other end of the one-way valve. The ozone storage tank is also connected to an ozone activated carbon filter.

[0010] Optionally, the flocculation sedimentation tank includes a sedimentation tank body, a flocculant addition pipe installed on the sedimentation tank body, a flocculant metering pump installed at one end of the flocculant addition pipe and located outside the sedimentation tank body, a flocculant storage tank connected to the inlet of the flocculant metering pump via a pipe, an inlet hole set on the flocculant addition pipe, two limiting plates installed on the flocculant addition pipe, a rotating ring movably fitted on the flocculant addition pipe and located between the two limiting plates, and stirring blades installed at equal angles on the rotating ring.

[0011] Optionally, when the water discharged from the pre-ozonation treatment tank flows into the flocculation sedimentation tank through the pipe, it will impact the stirring blades and drive the stirring blades to rotate.

[0012] Optionally, the sand filter includes a sand filter body, a support plate installed inside the sand filter body, a first sand filter layer disposed on top of the support plate, a second sand filter layer disposed on the first sand filter layer, and a filter screen installed on the sand filter body.

[0013] Optionally, the support plate is provided with through holes, the diameter of which is smaller than the size of the particles in the first sand filter layer; the particle size of the first sand filter layer is larger than the particle size of the second sand filter layer; the second sand filter layer is located between the first sand filter layer and the filter screen.

[0014] Optionally, the ozone activated carbon filter includes an activated carbon tank, multiple activated carbon storage frames installed at equal intervals on the activated carbon tank, activated carbon filled in the activated carbon storage frames, and an ozone aeration pipe installed between the activated carbon tank and the activated carbon storage frames.

[0015] Optionally, the dosing mechanism includes an oxygen aeration pipe located within the activated carbon tank, a first carbon dioxide aeration pipe connected to the activated carbon storage frames, and an oxygen aeration pipe located between the two activated carbon storage frames.

[0016] Optionally, the ultrafiltration membrane filtration tank includes a membrane tank body and a membrane module installed inside the membrane tank body, the membrane module being connected to an outlet pipe.

[0017] Optionally, the dual raw water inlet pipe assembly includes a main inlet pipe connected at one end to the pre-ozonation treatment tank, a mixing pump installed on the main inlet pipe, at least two raw water inlet pipes installed at the other end of the main inlet pipe, a first pH sensor installed on the main inlet pipe and located between the mixing pump and the pre-ozonation treatment tank; and a second pH sensor installed on the outlet pipe.

[0018] Optionally, the dosing mechanism also includes an oxygen storage tank and a carbon dioxide storage tank, an oxygen pressurizing pump connected to the oxygen storage tank, a carbon dioxide pressurizing pump connected to the carbon dioxide storage tank, a carbon dioxide aeration main pipe installed on the carbon dioxide pressurizing pump, and a second carbon dioxide aeration pipe installed on the carbon dioxide aeration main pipe, which aerates the water in the ultrafiltration membrane filtration tank.

[0019] Optionally, the outlet of the oxygen pressurizing pump is connected to the oxygen aeration pipe, and the first carbon dioxide aeration pipe is connected to the carbon dioxide aeration main pipe.

[0020] Compared with the prior art, this utility model provides a dual-source water purification system based on CO2 pH adjustment and coagulation technology, which has the following beneficial effects:

[0021] This dual-source water purification system, based on CO2-based pH-adjusting coagulation technology, performs multiple filtrations and treatments on the raw water. It can also adjust the pH of the raw water by adding carbon dioxide via a dosing mechanism, thereby lowering the pH, reducing the dissolution of aluminum salt coagulants, and decreasing the concentration of aluminum ions in the water. This promotes the flocculation and sedimentation of the flocculant, providing protection for the membrane components and human safety. It can treat and purify multiple water sources. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 This is a utility model Figure 1 A magnified view of a portion of point A in the middle.

[0024] Figure 3 This is a top view of the overall structure of this utility model.

[0025] Figure 4 This is a schematic diagram of the flocculant addition tube of this utility model.

[0026] Figure 5 This is a schematic diagram of the activated carbon storage frame of this utility model.

[0027] The diagram shows: 1. Dual raw water inlet pipe assembly; 11. Main inlet pipe; 12. Mixing pump; 13. Raw water inlet pipe; 14. First pH sensor; 2. Pre-ozone treatment tank; 21. Ozone tank body; 22. Connecting hole; 23. Ozone inlet pipe; 24. Booster pump; 25. Ozone storage tank; 26. Ozone generator; 27. Installation pipe; 28. One-way valve; 29. ​​Ejector; 3. Flocculation sedimentation tank; 31. Sedimentation tank body; 32. Flocculant addition pipe; 33. Flocculant metering pump; 34. Flocculant storage tank; 35. Dosing hole; 36. Limiting plate; 37. Rotating ring; 38. Stirring blade; 4. Sand filter; 41. Sand filter body; 42. Support plate; 421. Through hole; 43. First sand filter 44. Second sand filter layer; 45. Filter screen; 5. Ozone activated carbon filter; 51. Activated carbon tank body; 52. Activated carbon storage frame; 521. Storage tank; 522. Aeration tank; 523. Through hole; 524. Connection hole; 525. Aeration head; 53. Activated carbon; 54. Ozone aeration pipe; 6. Ultrafiltration membrane filter; 61. Filter membrane tank body; 62. Membrane module; 8. Water outlet pipe; 81. Second pH sensor; 9. Dosing mechanism; 91. Oxygen aeration pipe; 92. First carbon dioxide aeration pipe; 93. Oxygen storage tank; 94. Carbon dioxide storage tank; 95. Oxygen booster pump; 96. Carbon dioxide booster pump; 97. Carbon dioxide aeration main pipe; 98. Second carbon dioxide aeration pipe. Detailed Implementation

[0028] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, illustrates the present invention. Numerous specific details are set forth in the description below to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] The dual-source water purification system based on CO2 pH adjustment and coagulation technology proposed in this application can be applied to the purification of raw water from multiple sources, and can also be used in other similar application scenarios. The following is a detailed description of the dual-source water purification system based on CO2 pH adjustment and coagulation technology.

[0030] See appendix Figure 1 — Figure 5The diagram shows a preferred embodiment of a dual-source water purification system based on CO2-based pH-adjusting coagulation technology. This dual-source water purification system includes a pre-ozone treatment tank 2, a flocculation sedimentation tank 3, a sand filter 4, an ozone activated carbon filter 5, and an ultrafiltration membrane filter 6, connected sequentially. A dual raw water inlet pipe assembly 1 is located at the end of the pre-ozone treatment tank 2 furthest from the flocculation sedimentation tank 3. An outlet pipe 8 is located at the end of the ultrafiltration membrane filter 6 furthest from the ozone activated carbon filter 5. An addition mechanism 9 is used to add carbon dioxide and oxygen to the water.

[0031] This invention utilizes a pre-ozone treatment tank 2 to bring ozone gas into contact with the water. Ozone, being an oxidant, alters the properties of suspended solids in the water, making them more readily combine with coagulants to form larger flocs. These flocs are more easily removed during subsequent sedimentation and filtration, thus improving coagulation efficiency and treatment effectiveness. A flocculation sedimentation tank 3 mixes the raw water with the flocculant, causing impurities in the raw water to flocculate and settle, providing initial filtration and purification. A sand filter 4 removes larger particles and turbidity from the wastewater, providing cleaner water conditions for subsequent treatment processes and improving overall treatment efficiency. An ozone-activated carbon filter 5 oxidizes organic matter into inorganic substances and disrupts algae growth and reproduction, while simultaneously removing color and turbidity from the water. The process improves water transparency and cleanliness. Combined with the strong adsorption capacity of activated carbon, organic matter and odor-causing substances in the water are adsorbed onto its surface, achieving water purification and deodorization. The ultrafiltration membrane filter tank 6 uses physical filtration without adding chemical agents, avoiding secondary pollution and ensuring the safety of the treated water. The dosing mechanism 9 adds oxygen and carbon dioxide to the water in the form of aeration. Oxygen further increases the dissolved oxygen content in the water, providing a more sufficient oxygen environment for aerobic microorganisms. Carbon dioxide adjusts the pH value of the water, reacting with water to produce carbonic acid. The carbonic acid ionizes in the water to release hydrogen ions, thereby lowering the original pH value, reducing the residual aluminum content in the treated water, and preventing aluminum ions from passing through the membrane module and causing damage and fouling.

[0032] See appendix Figure 1 — Figure 3As shown, in this utility model, the pre-ozone treatment tank 2 includes an ozone tank body 21, a connecting hole 22 at the bottom of the ozone tank body 21, an ozone inlet pipe 23 at the opening of the connecting hole 22, a booster pump 24 on the ozone inlet pipe 23, an ozone storage tank 25 connected to the inlet end of the booster pump 24, an ozone generator 26 connected to the ozone storage tank 25, an installation pipe 27 on the bottom surface of the ozone tank body 21 connected to the connecting hole 22, an ozone one-way valve 28 installed on the installation pipe 27, and an ejector 29 installed on the other end of the one-way valve 28. The ozone storage tank 25 is also connected to the ozone activated carbon filter 5.

[0033] The pre-ozone treatment tank 2 of this utility model treats raw water as follows: Raw water enters the ozone tank 21 through the dual raw water inlet pipe group 1. The ozone generator 26 generates ozone and delivers it into the ozone storage tank 25. The booster pump 24 pressurizes the ozone in the ozone storage tank 25 and inputs it into the connecting hole 22 through the ozone air inlet pipe 23. Finally, it is injected into the raw water through the ejector 29 to form ozone aeration, so that the ozone can pre-treat the raw water and prepare for subsequent flocculation and sedimentation. This application protects the booster pump 24 by setting a one-way valve 28 to prevent the raw water generator pipe from entering the connecting hole 22.

[0034] See appendix Figure 1 — Figure 4 As shown, in this utility model, the flocculation sedimentation tank 3 includes a sedimentation tank body 31, a flocculant addition pipe 32 installed on the sedimentation tank body 31, a flocculant metering pump 33 installed at one end of the flocculant addition pipe 32 and located outside the sedimentation tank body 31, a flocculant storage tank 34 connected to the inlet of the flocculant metering pump 33 via a pipe, an inlet hole 35 set on the flocculant addition pipe 32, two limiting plates 36 installed on the flocculant addition pipe 32, a rotating ring 37 movably mounted on the flocculant addition pipe 32 via bearings and located between the two limiting plates 36, and stirring blades 38 installed at equal angles on the rotating ring 37; when the water discharged from the pre-ozone treatment tank 2 flows into the flocculation sedimentation tank 3 through the pipe, it will impact the stirring blades 38, pushing the stirring blades 38 to rotate.

[0035] The water treatment process of the flocculation sedimentation tank 3 in this utility model is as follows: the water treated by the pre-ozone treatment tank 2 flows into the sedimentation tank 31 through the pipeline. When the water flows into the sedimentation tank 31, the water flow will impact the stirring blade 38, causing the stirring blade 38 to rotate. At the same time, the flocculant metering pump 33 pressurizes the flocculant in the flocculant storage tank 34 and adds the flocculant into the sedimentation tank 31 through the flocculant addition pipe 32 to flocculate and settle the water.

[0036] It should be noted that the installation height of the flocculant addition pipe 32 is higher or lower than the height of the inlet of the sedimentation tank 31, but the difference between the two positions is less than the height of the stirring blade 38. This ensures that the water flow can impact the stirring blade 38, allowing it to rotate and agitate the water. This results in more thorough mixing of the flocculant and water, improving the efficiency of flocculation and sedimentation of impurities in the water and enhancing the flocculation and sedimentation effect. Furthermore, the impact force of the water flow drives the stirring blade 38 to rotate, which not only obstructs the water flow and reduces its velocity, but also further improves the flocculation and sedimentation effect. At the same time, the rotation of the stirring blade 38 can effectively prevent the stirring blade from being driven too fast by the motor, which could lead to poor flocculation and sedimentation. This also saves energy.

[0037] See appendix Figure 1 — Figure 3 As shown, in this utility model, the sand filter 4 includes a sand filter body 41, a support plate 42 installed inside the sand filter body 41, a first sand filter layer 43 disposed on the top of the support plate 42, a second sand filter layer 44 disposed on the first sand filter layer 43, and a filter screen 45 installed on the sand filter body 41; wherein, the support plate 42 is provided with a through hole 421, the diameter of which is smaller than the size of the particles in the first sand filter layer 43; the size of the particles in the first sand filter layer 43 is larger than the size of the particles in the second sand filter layer 44; the second sand filter layer 44 is located between the first sand filter layer 43 and the filter screen 45.

[0038] The water treatment process of the sand filter 4 in this utility model is as follows: After being treated by the flocculation sedimentation tank 3, the water flows into the sand filter body 41 through the pipe. The inflow position is located below the support plate 42. Then, the water passes through the first sand filter layer 43, the second sand filter layer 44 and the filter screen 45 in sequence, and the water is filtered multiple times to ensure that the water is completely purified. Finally, it flows out from the outlet located at the top of the sand filter body 41 and flows into the ozone activated carbon filter 5 through the pipe.

[0039] This utility model uses a support plate 42 to support the first sand filter layer 43, preventing the inlet of the sedimentation tank 31 from being blocked by the first sand filter layer 43, and also preventing particles from the first sand filter layer 43 from entering the inlet. Through the arrangement of the first sand filter layer 43, the second sand filter layer 44 and the filter screen 45, the water can be filtered multiple times, improving the filtration effect. The filter screen 45 can limit the sand particles in the second sand filter layer 44, preventing the top sand particles from flowing into the ozone activated carbon filter tank 5 with the water flow.

[0040] See appendix Figure 1 — Figure 5As shown, in this utility model, the ozone activated carbon filter 5 includes an activated carbon tank body 51, a plurality of activated carbon storage frames 52 installed at equal intervals on the activated carbon tank body 51, activated carbon 53 filled in the activated carbon storage frames 52, and an ozone aeration pipe 54 installed between the activated carbon tank body 51 and the activated carbon storage frames 52.

[0041] The ozone activated carbon filter 5 of this utility model treats water as follows: After being treated by the sand filter 4, the water flows into the activated carbon tank 51 through a pipe. It is first aerated by the ozone aeration pipe 54, then comes into contact with the activated carbon 53 in the first activated carbon storage frame 52, and is aerated by the first carbon dioxide aeration pipe 92 in the activated carbon storage frame 52. Then it is aerated by the oxygen aeration pipe 91. After being treated by the second and third activated carbon storage frames 52 in the same way, it flows out from the other end of the activated carbon tank 51.

[0042] It should be noted that the activated carbon storage frame 52 is provided with a storage tank 521 and an aeration tank 522. Activated carbon 53 is placed in the storage tank 521, and the particle size of activated carbon 53 in the activated carbon storage frame 52 decreases with the direction of water flow. The activated carbon storage frame 52 is provided with a through hole 523 with the same direction of opening and water flow. The diameter of the through hole 523 is smaller than the particle size of activated carbon 53. The activated carbon storage frame 52 is also provided with a connection hole 524, which is connected to the first carbon dioxide aeration pipe 92. An aeration head 525 connected to the connection hole 524 is installed in the aeration tank 522.

[0043] See appendix Figure 1 — Figure 3 As shown, in this utility model, the ultrafiltration membrane filtration tank 6 includes a membrane tank body 61 and a membrane assembly 62 installed in the membrane tank body 61. The membrane assembly 62 is connected to the water outlet pipe 8.

[0044] The water treatment process of the ultrafiltration membrane filter tank 6 in this utility model is as follows: the water treated by the ozone activated carbon filter tank 5 flows into the filter membrane tank 61 through the pipe, is aerated by the second carbon dioxide aeration pipe 98, and then the water flows into the membrane after passing through the membrane module 62. The purified water flows out from the membrane through the outlet pipe 8. This application adjusts the pH value of the water and reduces the aluminum dissolution by aerating the water with carbon dioxide in the filter membrane tank 61. Compared with aerating the water in the membrane, the structure of this application is simpler.

[0045] See appendix Figure 1 — Figure 3As shown, in this utility model, the dual raw water inlet pipe group 1 includes a main inlet pipe 11 connected to the pre-ozone treatment tank 2 at one end, a mixing pump 12 installed on the main inlet pipe 11, at least two raw water inlet pipes 13 installed at the other end of the main inlet pipe 11, a first pH sensor 14 installed on the main inlet pipe 11 and located between the mixing pump 12 and the pre-ozone treatment tank 2; and a second pH sensor 81 installed on the outlet pipe 8.

[0046] This invention, through the arrangement of multiple raw water inlet pipes 13 and a main inlet pipe 11, allows for the convergence and unified treatment of multiple water sources, ensuring a sufficient water supply. A mixing pump 12 is used to mix the multiple raw water sources. A first pH sensor 14 monitors the pH of the mixed raw water and transmits the result to a controller. The controller then controls the amount of carbon dioxide added, thereby precisely controlling the pH of the treated water. It should be noted that the mixing pump 12 can be a dual-stage mixing pump.

[0047] See appendix Figure 1 — Figure 3 As shown, in this invention, the dosing mechanism 9 includes an oxygen aeration pipe 91 located within the activated carbon tank 51, a first carbon dioxide aeration pipe 92 connected to the activated carbon storage frame 52, an oxygen storage tank 93 and a carbon dioxide storage tank 94, an oxygen booster pump 95 connected to the oxygen storage tank 93, a carbon dioxide booster pump 96 connected to the carbon dioxide storage tank 94, a carbon dioxide aeration main pipe 97 mounted on the carbon dioxide booster pump 96, and a second carbon dioxide aeration pipe 98 mounted on the carbon dioxide aeration main pipe 97. This second carbon dioxide aeration pipe 98 aerates the water in the ultrafiltration membrane filter tank 6. It should be noted that both the oxygen booster pump 95 and the carbon dioxide booster pump 96 are metering pumps.

[0048] See appendix Figure 1 — Figure 3 As shown, in this utility model, the oxygen aeration pipe 91 is located between two activated carbon storage frames 52, the outlet of the oxygen pressurization pump 95 is connected to the oxygen aeration pipe 91, and the first carbon dioxide aeration pipe 92 is connected to the carbon dioxide aeration main pipe 97.

[0049] See appendix Figure 1 — Figure 5 As shown, this utility model mixes multiple water sources and then monitors the mixed raw water through a first pH sensor 14, transmitting the pH value to a controller. The controller adjusts the carbon dioxide aeration rate based on the pH value; that is, the higher the pH value, the greater the carbon dioxide aeration rate, thereby lowering the pH of the water. If the pH of the raw water is within a specified range, carbon dioxide aeration is not required, thus enabling the purification of raw water from multiple sources.

[0050] The above embodiments are illustrative of this application and are not intended to limit this application. Any simple modifications to this application are within the protection scope of this application.

Claims

1. A dual-source water purification system based on CO2-based pH-adjusting coagulation technology, characterized in that, It includes a pre-ozone treatment tank (2), a flocculation sedimentation tank (3), a sand filter (4), an ozone activated carbon filter (5), and an ultrafiltration membrane filter (6) connected in sequence; a dual raw water inlet pipe group (1) set at the end of the pre-ozone treatment tank (2) away from the flocculation sedimentation tank (3); an outlet pipe (8) set at the end of the ultrafiltration membrane filter (6) away from the ozone activated carbon filter (5); and an addition mechanism (9) for adding carbon dioxide and oxygen to the water.

2. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 1, characterized in that, The pre-ozone treatment tank (2) includes an ozone tank body (21), a connecting hole (22) at the bottom of the ozone tank body (21), an ozone inlet pipe (23) at the opening of the connecting hole (22), a booster pump (24) on the ozone inlet pipe (23), an ozone storage tank (25) connected to the inlet end of the booster pump (24), an ozone generator (26) connected to the ozone storage tank (25), an installation pipe (27) on the bottom surface of the ozone tank body (21) connected to the connecting hole (22), an ozone one-way valve (28) installed on the installation pipe (27), and an ejector (29) installed on the other end of the one-way valve (28). The ozone storage tank (25) is also connected to the ozone activated carbon filter (5).

3. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 1, characterized in that, The flocculation sedimentation tank (3) includes a sedimentation tank body (31), a flocculant addition pipe (32) installed on the sedimentation tank body (31), a flocculant metering pump (33) installed at one end of the flocculant addition pipe (32) and located outside the sedimentation tank body (31), a flocculant storage tank (34) connected to the inlet of the flocculant metering pump (33) through a pipe, an inlet hole (35) set on the flocculant addition pipe (32), two limiting plates (36) installed on the flocculant addition pipe (32), a rotating ring (37) movably fitted on the flocculant addition pipe (32) and located between the two limiting plates (36), and stirring blades (38) installed at equal angles on the rotating ring (37). When the water discharged from the pre-ozone treatment tank (2) flows into the flocculation sedimentation tank (3) through the pipe, it will impact the stirring blade (38) and drive the stirring blade (38) to rotate.

4. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 1, characterized in that, The sand filter (4) includes a sand filter body (41), a support plate (42) installed inside the sand filter body (41), a first sand filter layer (43) set on the top of the support plate (42), a second sand filter layer (44) set on the first sand filter layer (43), and a filter screen (45) installed on the sand filter body (41).

5. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 4, characterized in that, The support plate (42) is provided with through holes (421), the diameter of which is smaller than the size of the particles in the first sand filter layer (43); The particle size of the first sand filter layer (43) is larger than that of the second sand filter layer (44); The second sand filter layer (44) is located between the first sand filter layer (43) and the filter screen (45).

6. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 2, characterized in that, The ozone activated carbon filter (5) includes an activated carbon tank body (51), multiple activated carbon storage frames (52) installed at equal intervals on the activated carbon tank body (51), activated carbon (53) filled in the activated carbon storage frames (52), and an ozone aeration pipe (54) installed between the activated carbon tank body (51) and the activated carbon storage frames (52). The dosing mechanism (9) includes an oxygen aeration pipe (91) located in the activated carbon tank (51) and a first carbon dioxide aeration pipe (92) connected to the activated carbon storage frame (52). The oxygen aeration pipe (91) is located between the two activated carbon storage frames (52).

7. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 1, characterized in that, The ultrafiltration membrane filter tank (6) includes a filter tank body (61) and a membrane module (62) installed inside the filter tank body (61) and connected to the outlet pipe (8).

8. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 1, characterized in that, The dual raw water inlet pipe group (1) includes a main inlet pipe (11) connected to the pre-ozone treatment tank (2) at one end, a mixing pump (12) installed on the main inlet pipe (11), at least two raw water inlet pipes (13) installed on the other end of the main inlet pipe (11), and a first pH sensor (14) installed on the main inlet pipe (11) and located between the mixing pump (12) and the pre-ozone treatment tank (2). A second pH sensor (81) is provided on the water outlet pipe (8).

9. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 6, characterized in that, The dosing mechanism (9) also includes an oxygen storage tank (93) and a carbon dioxide storage tank (94), an oxygen booster pump (95) connected to the oxygen storage tank (93), a carbon dioxide booster pump (96) connected to the carbon dioxide storage tank (94), a carbon dioxide aeration main pipe (97) installed on the carbon dioxide booster pump (96), and a second carbon dioxide aeration pipe (98) installed on the carbon dioxide aeration main pipe (97), which aeration the water in the ultrafiltration membrane filter tank (6).

10. The dual-source water purification system based on CO2 pH adjustment and coagulation technology according to claim 9, characterized in that, The outlet of the oxygen pressurizing pump (95) is connected to the oxygen aeration pipe (91), and the first carbon dioxide aeration pipe (92) is connected to the carbon dioxide aeration main pipe (97).

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