Pure water and ultrapure water production system based on mercury-free ultraviolet lamp

Abstract

The invention belongs to the field of water treatment, and discloses a mercury-free ultraviolet lamp-based pure water and ultrapure water production system, which comprises a raw water tank, a pretreatment unit, a primary filtration unit, a first reverse osmosis unit, a second reverse osmosis unit, an EDI unit, an ultraviolet sterilization unit, a pure water unit, a cleaning unit, a control unit and other structures, according to the technical scheme, water flows along the multiple groups of flowing pipes in a snakelike manner, so that the ultraviolet sterilization time is ensured, the volume and the occupied space of the ultraviolet sterilization device are reduced, the flowing direction of water flow in the corresponding flowing pipe can be changed, the corresponding flowing pipe can be intercepted when the mercury-free ultraviolet lamp is damaged, and non-stop replacement of the mercury-free ultraviolet lamp is realized; the mercury-free ultraviolet lamp in the difference compensation pipe is used for temporarily replacing the damaged mercury-free ultraviolet lamp for sterilization, so that when one group of mercury-free ultraviolet lamps are damaged, the water flow still can reach enough sterilization time, the flow speed of the fluid does not need to be adjusted, and the sterilization accuracy is improved and guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of water treatment, and particularly to a pure water and ultrapure water production system based on a mercury-free ultraviolet lamp. Background Art

[0002] Nowadays, ultrapure water has been widely used in the fields of biology, medicine, automobiles, etc. In this kind of water, except for water molecules, there are almost no impurities, let alone bacteria, viruses, organic substances such as chlorinated dioxins, and of course no mineral trace elements required by the human body. Ultrapure water has no hardness, a sweet taste, and is often called soft water. It can be directly drunk or boiled and drunk. Generally, an ultrapure water system produces ultrapure water through multiple filtration, ion exchange, degassing, reverse osmosis, ultraviolet light, ultrafiltration, nanofiltration, and ion adsorption filtration. Among them, an ultraviolet sterilization device is used to sterilize the ultrapure water. The ultraviolet sterilization device usually adopts two methods, the flow-through type and the immersion type.

[0003] In the immersion type, the ultraviolet sterilization lamp is directly placed in the water. However, the lamp tube installed in this way may be broken due to unexpected situations, posing a safety hazard. The principle of the flow-through type is to generate pressure by a water pump so that a certain flow rate of water flows through the outer periphery of a quartz sleeve that can transmit ultraviolet light. The 254nm ultraviolet light generated by the ultraviolet sterilization lamp disinfects and sterilizes the water. When sterilizing, the water flows through the glass tube outside the ultraviolet lamp. Since the water is flowing, the speed of the flowing glass tube is very fast. In order to achieve a better sterilization effect, generally a longer ultraviolet lamp is selected, or multiple groups of ultraviolet lamps are spliced into a longer flow channel to extend the water flow time. This will result in a longer length of the ultraviolet lamp channel, increasing the volume of the system, occupying more space, making it inconvenient to arrange the overall system, and also inconvenient to replace the damaged ultraviolet lamp without shutting down the machine. When the ultraviolet lamp is damaged, the sterilization time is insufficient, resulting in the sterilization quality not meeting the standard. Summary of the Invention

[0004] The present invention aims to provide a pure water and ultrapure water production system based on a mercury-free ultraviolet lamp to solve the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp, comprising:

[0007] A raw water tank for storing raw water to be treated;

[0008] A pretreatment unit communicated with the raw water tank and used for pretreating the raw water;

[0009] Initial filtration unit, which is connected to the pretreatment unit and preliminarily filters raw water;

[0010] First reverse osmosis unit, which is connected to the initial filtration unit and precisely filters raw water;

[0011] Second reverse osmosis unit, which is connected to the first reverse osmosis unit and precisely filters water again;

[0012] EDI unit, which is connected to the second reverse osmosis unit and is used to remove positive and negative ions in water;

[0013] Ultraviolet sterilization unit, which includes a main flow pipe, a flow pipe, a compensation pipe and a mercury-free ultraviolet lamp 37. The flow pipe is connected with a glass cover. The flow pipe is provided with an installation groove. The mercury-free ultraviolet lamp is slidably connected with the installation groove. The mercury-free ultraviolet lamp is connected with an installation disc, and the installation disc is detachably connected with the flow pipe. Both ends of the flow pipe are respectively connected with a liquid inlet pipe and a liquid discharge pipe. There are two groups of main flow pipes. Any one of the main flow pipes is connected to the EDI unit. The liquid inlet pipe and the liquid discharge pipe are respectively detachably connected with the two groups of main flow pipes. The liquid inlet pipe is connected with a first switch. The main flow pipe close to the liquid inlet pipe is connected with a second switch. The main flow pipe close to the liquid discharge pipe is connected with a third switch. The first switch, the second switch and the third switch cooperate with the flow pipe. There are several groups of flow pipes. The two groups of main flow pipes are jointly connected with a first liquid outlet pipe. The main flow pipes are respectively connected with one-way valves. The first liquid outlet pipe is connected with a shunt pipe. The shunt pipe is connected with a control valve. The compensation pipe has exactly the same structure as the flow pipe. The shunt pipe is connected with the compensation pipe. The compensation pipe is connected with a second liquid outlet pipe;

[0014] Pure water unit, which includes a pure water collection tank, and the first liquid outlet pipe and the second liquid outlet pipe are respectively connected to the pure water collection tank;

[0015] Cleaning unit, which is used to clean the first reverse osmosis unit;

[0016] Control unit, which is used to control the system path.

[0017] Preferably, the pretreatment unit includes a stirring tank and a chemical dosing tank. The stirring tank is connected with a servo motor. The output shaft of the servo motor is connected with a stirring shaft. The stirring tank is connected with a first stirring pipe, a second stirring pipe and a chemical dosing stirring pipe. The first stirring pipe is connected with the raw water tank. The second stirring pipe is connected with the initial filtration unit. The chemical dosing tank is connected with a chemical dosing pump. The chemical dosing stirring pipe is connected with the chemical dosing pump. The first stirring pipe and the second stirring pipe are respectively connected with flow detectors.

[0018] Preferably, the primary filtration unit includes an aeration tank, an iron and manganese removal filter, a quartz sand filter, and an activated carbon filter. The second stirring pipe is communicated with the aeration tank, and the aeration tank, the iron and manganese removal filter, the quartz sand filter, and the activated carbon filter are sequentially communicated through pipelines.

[0019] Preferably, the first reverse osmosis unit includes a precision filter, a first reverse osmosis RO membrane module, and a first high-pressure pump. The precision filter is communicated with the activated carbon filter and the first high-pressure pump. The first reverse osmosis RO membrane module is connected with a reverse osmosis water inlet pipe, a reverse osmosis drain pipe, and a first concentrated water discharge pipe. The reverse osmosis water inlet pipe is connected with the first high-pressure pump, and the reverse osmosis drain pipe is connected with the water inlet end of the second reverse osmosis unit.

[0020] Preferably, the second reverse osmosis unit includes a second reverse osmosis RO membrane module, an intermediate tank, a PH adjustment tank, and a second high-pressure pump. The reverse osmosis drain pipe is communicated with the intermediate tank. The second reverse osmosis RO membrane module is communicated with the intermediate tank through the second high-pressure pump and pipelines. The second reverse osmosis RO membrane module is connected with a second concentrated water discharge pipe, and the second concentrated water discharge pipe is communicated with the raw water tank. The pure water outlet end of the second reverse osmosis RO membrane module is communicated with the EDI unit. The EDI unit is connected with an ultraviolet liquid inlet pipe, and the ultraviolet liquid inlet pipe is communicated with any one of the flow main pipes.

[0021] Preferably, the cleaning unit includes a medicine tank and a cleaning filter tank. The medicine tank is communicated with the cleaning filter tank. The cleaning filter tank is connected with a forward cleaning pipe, and the forward cleaning pipe is communicated with the reverse osmosis water inlet pipe. The forward cleaning pipe is connected with a reverse cleaning pipe, and the reverse cleaning pipe is communicated with the first concentrated water discharge pipe. The pure water collection tank is communicated with the medicine tank.

[0022] Preferably, the ultraviolet liquid inlet pipe is connected with a conductivity detector, and the ultraviolet liquid inlet pipe is connected with a discharge pipe. The discharge pipe is communicated with the second concentrated water discharge pipe.

[0023] Preferably, the pure water collection tank is connected with a liquid level sensor. There are several groups of pure water collection tanks, and the pure water collection tanks are communicated with the raw water tank.

[0024] The beneficial effects of this technical solution compared with the prior art:

[0025] (1) This technical solution uses a mercury-free ultraviolet lamp to complete sterilization, avoiding the situation where toxic substances inside diffuse into the water when the ultraviolet lamp breaks, thus eliminating potential safety hazards. This application can arrange multiple sets of flow tubes from top to bottom in the form of two groups of main flow pipes. A mercury-free ultraviolet lamp is installed inside the flow tubes, and the water flows in a serpentine shape through multiple sets of flow tubes, ensuring the ultraviolet sterilization time while reducing the volume and occupied space of the ultraviolet sterilization device, facilitating the reasonable assembly of the preparation system, greatly improving the system applicability. By the cooperation of the first switch, the second switch and the third switch, the flow direction of the water in the corresponding flow tube can be changed, and when the mercury-free ultraviolet lamp is damaged, the corresponding flow tube can be intercepted to achieve the non-stop replacement of the mercury-free ultraviolet lamp. At the same time, a compensation tube is set up, and the mercury-free ultraviolet lamp in the compensation tube is temporarily used to replace the damaged mercury-free ultraviolet lamp for sterilization, so that when one group of mercury-free ultraviolet lamps is damaged, the water can still reach a sufficient sterilization time without adjusting the fluid flow rate, ensuring the sterilization accuracy.

[0026] (2) This technical solution is equipped with a cleaning unit, which can perform forward flushing and reverse flushing on the first reverse osmosis unit, improving the cleaning effect of the system and ensuring the water production efficiency and quality. The pure water collection tank is equipped with a liquid level sensor, and multiple groups of pure water collection tanks are provided. Through the liquid level sensor, the storage time of pure water and ultrapure water in the pure water collection tank can be monitored in real time. When the storage time exceeds the set value, the ultrapure water is sent back to the original water tank for re-purification to avoid the re-growth and contamination of bacteria caused by the long-term storage of ultrapure water in the pure water collection tank, improving the system stability. Moreover, the pure water collection tank is connected to the reagent tank, and the cleaning agent can be provided to the cleaning unit through the pure water collection tank, improving the cleaning effect and reducing the blockage of the first reverse osmosis RO membrane module during the cleaning process, enhancing the cleaning effect. Description of the Drawings

[0027] Figure 1 is a schematic flow chart of the present invention;

[0028] Figure 2 is a schematic structural diagram of the ultraviolet sterilization unit provided by the present invention;

[0029] Figure 3 is a schematic structural diagram of the pretreatment unit provided by the present invention;

[0030] Figure 4 is a schematic diagram of the pure water collection tank provided by the present invention;

[0031] Reference numerals: raw water tank 1, mixing tank 2, chemical dosing tank 3, aeration tank 4, iron and manganese removal filter 5, quartz sand filter 6, activated carbon filter 7, precision filter 8, first high-pressure pump 9, first reverse osmosis unit 10, reverse osmosis inlet pipe 11, first reverse osmosis RO membrane module 12, reverse osmosis drain pipe 13, first concentrated water discharge pipe 14, reverse cleaning pipe 15, forward cleaning pipe 16, chemical agent tank 17, cleaning filter tank 18, intermediate tank 19, PH adjustment tank 20, second high-pressure pump 21, second reverse osmosis unit 22, second reverse osmosis RO membrane module 23, EDI unit 24, conductivity detector 25, discharge pipe 26, UV inlet pipe 27, UV sterilization unit 28, shunt pipe 29, first liquid outlet pipe 30, second liquid outlet pipe 31, pure water collection tank 32, control unit 33, second concentrated water discharge pipe 34, flow pipe 35, glass cover 36, mercury-free UV lamp 37, installation groove 38, installation plate 39, inlet pipe 40, drain pipe 41, main flow pipe 42, first switch 43, second switch 44, third switch 45, check valve 46, compensation pipe 47, stirring shaft 49, first stirring pipe 50, second stirring pipe 51, chemical dosing stirring pipe 52, flow detector 53, servo motor 54, chemical dosing pump 55, liquid level sensor 56. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments:

[0033] As Figures 1 to 4 shown, a pure water and ultrapure water production system based on a mercury-free UV lamp 37 includes

[0034] a raw water tank 1 for storing raw water to be treated;

[0035] a pretreatment unit communicated with the raw water tank 1 for preprocessing the raw water;

[0036] a primary filtration unit communicated with the pretreatment unit for preliminarily filtering the raw water;

[0037] a first reverse osmosis unit 10 communicated with the primary filtration unit for precisely filtering the raw water;

[0038] a second reverse osmosis unit 22 communicated with the first reverse osmosis unit 10 for precisely filtering the water again;

[0039] an EDI unit 24 communicated with the second reverse osmosis unit 22 for cleaning positive and negative ions in the water;

[0040] The ultraviolet sterilization unit 28 includes a main flow pipe 42, a flow pipe 35, a compensation pipe 47, and a mercury-free ultraviolet lamp 37. The flow pipe 35 is connected with a glass cover 36. The flow pipe 35 is provided with a mounting groove 38. The mercury-free ultraviolet lamp 37 is slidably connected with the mounting groove 38. The mercury-free ultraviolet lamp 37 is connected with a mounting plate 39. The mounting plate 39 and the flow pipe 35 are detachably connected by bolts. Both ends of the flow pipe 35 are respectively connected with a liquid inlet pipe 40 and a liquid discharge pipe 41. There are two groups of main flow pipes 42. One group of main flow pipes 42 is communicated with the EDI unit 24 and serves as a pipeline for liquid to enter the ultraviolet sterilization unit 28. The liquid inlet pipe 40 and the liquid discharge pipe 41 are respectively detachably connected with the two groups of main flow pipes 42 by bolts. The liquid inlet pipe 40 is connected with a first switch 43. The main flow pipe 42 near the liquid inlet pipe 40 is connected with a second switch 44. The main flow pipe 42 near the liquid discharge pipe 41 is connected with a third switch 45. The first switch 43, the second switch 44, and the third switch 45 cooperate with the flow pipe 35, that is, one group of flow pipes 35 works with three switches. There are several groups of flow pipes 35. The two groups of main flow pipes 42 are jointly connected with a first liquid outlet pipe 30. The main flow pipes 42 are respectively connected with check valves 46. The first liquid outlet pipe 30 is connected with a shunt pipe 29. The shunt pipe 29 is connected with a switching valve. The compensation pipe 47 has the same structure as the flow pipe 35. The shunt pipe 29 is connected with the compensation pipe 47. The compensation pipe 47 is connected with a second liquid outlet pipe 31. The first liquid outlet pipe 30 and the second liquid outlet pipe 31 are respectively connected with the pure water collection tank 32.

[0041] The following takes Figure 2 To further describe the ultraviolet sterilization unit 28, as Figure 2 shown, there are three groups of flow pipes 35. The three groups of flow pipes 35 are arranged in sequence from bottom to top along the two groups of main flow pipes 42. The mercury-free ultraviolet lamp 37 passes through the mounting groove 38 and enters the inner side of the glass cover 36, and is detachably connected with the flow pipe 35 through the mounting plate 39. The three groups of flow pipes 35 are arranged in a staggered manner from bottom to top. That is, the liquid inlet pipe 40 of the lowermost flow pipe 35 is located on its left side, then the liquid inlet pipe 40 of the middle group of flow pipes 35 is located on its right side, and the liquid inlet pipe 40 of the uppermost flow pipe 35 is located on its left side, so that the water can flow in a serpentine shape along the multiple groups of flow pipes 35. The main flow pipe 42 near the liquid inlet pipe 40 of the corresponding flow pipe 35 is connected with a second switch 44. As Figure 2As shown, the second switches 44 are provided with three groups corresponding to the three groups of flow tubes 35, and at the same time, the three groups of second switches 44 are all located on the side of the three groups of flow tubes 35 provided with the first switches 43. When the mercury-free ultraviolet lamps 37 in the flow tubes 35 are used normally, the switch valve on the shunt tube 29 is closed, the first switch 43 is turned on, the second switch 44 is closed, and the third switch 45 is turned on. The first switches 43, the second switches 44 and the switches corresponding to all the flow tubes 35 follow this control mode, that is, when the first switch 43 is turned on, all the first switches 43 are turned on, and all The second switch 44 is closed and the third switch 45 is opened. At this time, water flows from the left flow main pipe 42 into the lowermost flow pipe 35, flows from left to right along the lowermost flow pipe 35 into the middle flow pipe 35, flows from right to left along the middle flow pipe 35 into the upper flow pipe 35, flows from left to right along the upper flow pipe 35 and then flows along the right flow main pipe 42 and the first liquid outlet pipe 30 into the pure water tank, and then ultraviolet sterilization is performed. The control unit 33 can control the opening and closing of the mercury-free ultraviolet lamp 37 and detect the working condition of the mercury-free ultraviolet lamp 37;

[0042] When one of the mercury-free UV lamps 37 is damaged, Figure 2 Taking the damage of the mercury-free ultraviolet lamp 37 in the middle flow tube 35 as an example, the control unit 33 detects that the mercury-free ultraviolet lamp 37 is damaged, and then controls the first switch 43 matched with the middle flow tube 35 to be closed, the second switch 44 to be opened, and the third switch 45 to be closed. At the same time, the second switch 44 corresponding to the upper flow tube 35 is opened, and the third switch 45 is closed. When the flow tube 35 is provided with multiple groups, the second switch 44 and the third switch 45 corresponding to the upper side of the damaged flow tube 35 are changed to a state opposite to the original state. The original second switch 44 is opened and the second switch 44 is closed at this time; and the switch valve on the shunt pipe 29 is opened, and the switch valve on the first liquid outlet pipe 30 is closed. At this time, the third switch 45 on the upper side of the right side has been closed, so the water flows along the lowermost flow tube 35. After flowing from left to right into the right side branch main pipe, it directly enters the right end of the upper flow pipe 35 along the right side flow main pipe 42, then flows from right to left along the uppermost flow pipe 35 for sterilization, then enters the first liquid outlet pipe 30 along the left side flow main pipe 42, then enters the branch pipe 29, then enters the make-up pipe 47 to make up for the ultraviolet sterilization time, and then is discharged into the pure water collection box 32 along the second liquid outlet pipe 31. This process can be used to repair the damaged mercury-free ultraviolet lamp 37 in the branch pipe 29; after the maintenance is completed, the use of the make-up pipe 47 can be stopped, so that the ultraviolet sterilization unit 28 can work in the original state, and the control unit 33 controls the opening and closing of the corresponding first switch 43, the second switch 44, the third switch 45 and the switch valve to complete the non-stop disassembly of the mercury-free ultraviolet lamp 37.

[0043] Pure water unit. The pure water unit includes a pure water collection tank 32. A first liquid outlet pipe 30 and a second liquid outlet pipe 31 are respectively connected to the pure water collection tank 32. A liquid level sensor 56 is connected to the bottom of the pure water collection tank 32. Through the liquid level sensor 56, the amount of ultrapure water in the pure water collection tank 32 and the storage time of the ultrapure water can be monitored in real time. When the liquid level drops to 0, it means there is no ultrapure water in the ultrapure water collection tank, and then the storage time of the ultrapure water can be counted. There are two groups of pure water collection tanks 32. The first liquid outlet pipe 30 and the second liquid outlet pipe 31 are both provided with two groups of water outlets, which are respectively connected to the two groups of pure water collection tanks 32. The pure water collection tank 32 is communicated with the original water tank 1.

[0044] Cleaning unit. The cleaning unit is used to clean the first reverse osmosis unit 10.

[0045] Control unit 33. The control unit 33 is used to control the system passage.

[0046] The pretreatment unit includes a mixing tank 2 and a chemical dosing tank 3. The mixing tank 2 is connected with a servo motor 54. The output shaft of the servo motor 54 is connected with a stirring shaft 49. The stirring shaft 49 is located inside the mixing tank 2. The mixing tank 2 is connected with a first mixing pipe 50, a second mixing pipe 51 and a chemical dosing mixing pipe 52. The first mixing pipe 50 is connected with the original water tank 1. The second mixing pipe 51 is connected with the primary filtration unit. The chemical dosing tank 3 is connected with a chemical dosing pump 55. The chemical dosing mixing pipe 52 is connected with the chemical dosing pump 55. The first mixing pipe 50 and the second mixing pipe 51 are respectively connected with a flow detector 53. Through the flow detector 53, the amount of raw water entering the mixing tank 2 can be detected, and then the chemical dosing speed and the chemical dosing amount can be controlled conveniently.

[0047] The primary filtration unit includes an aeration tank 4, an iron and manganese removal filter 5, a quartz sand filter 6 and an activated carbon filter 7. The second mixing pipe 51 is communicated with the aeration tank 4. The aeration tank 4, the iron and manganese removal filter 5, the quartz sand filter 6 and the activated carbon filter 7 are sequentially communicated through pipelines.

[0048] The first reverse osmosis unit 10 includes a precision filter 8, a first reverse osmosis RO membrane module 12 and a first high-pressure pump 9. The precision filter 8 is communicated with the activated carbon filter 7. The precision filter 8 is communicated with the first high-pressure pump 9. There is also a transition tank between the precision filter and the first high-pressure pump 9. The transition tank stores intermediate water. The first reverse osmosis RO membrane module 12 is connected with a reverse osmosis inlet pipe 11, a reverse osmosis drain pipe 13 and a first concentrated water discharge pipe 14. The first concentrated water discharge pipe 14 is communicated with the sewage outlet. The reverse osmosis inlet pipe 11 is connected with the first high-pressure pump 9. The reverse osmosis drain pipe 13 is connected with the water inlet end of the second reverse osmosis unit 22.

[0049] The second reverse osmosis unit 22 includes a second reverse osmosis RO membrane module 23, an intermediate tank 19, a pH adjustment tank 20, and a second high-pressure pump 21. The pH adjustment tank 20 communicates with the intermediate tank 19, the second high-pressure pump 21 communicates with the pH adjustment tank 20, the reverse osmosis drain pipe 13 communicates with the intermediate tank 19, the second reverse osmosis RO membrane module 23 communicates with the intermediate tank 19 through the second high-pressure pump 21 and pipelines. The second reverse osmosis RO membrane module 23 is connected with a second concentrated water discharge pipe 34, the second concentrated water discharge pipe 34 communicates with the raw water tank 1, the pure water outlet end of the second reverse osmosis RO membrane module 23 communicates with the EDI unit 24, the EDI unit 24 is connected with an ultraviolet liquid inlet pipe 27, the ultraviolet liquid inlet pipe 27 communicates with any one of the flow main pipes 42, the ultraviolet liquid inlet pipe 27 is connected with a conductivity detector 25, the ultraviolet liquid inlet pipe 27 is connected with a discharge pipe 26, and the discharge pipe 26 communicates with the second concentrated water discharge pipe 34.

[0050] The cleaning unit includes a chemical agent tank 17 and a cleaning filter tank 18. The chemical agent tank 17 communicates with the cleaning filter tank 18. The cleaning filter tank 18 is connected with a forward cleaning pipe 16. The forward cleaning pipe 16 communicates with the reverse osmosis water inlet pipe 11. The forward cleaning pipe 16 is connected with a reverse cleaning pipe 15. The reverse cleaning pipe 15 communicates with the first concentrated water discharge pipe 14. The pure water collection tank 32 communicates with the chemical agent tank 17.

[0051] Further, the connections described in this application are all made through pipelines, and a switch valve is provided on each pipeline. The opening and closing of the switch valve are all completed by the control unit 33. The flow of water in this application is all powered by pumps, which is hereby specifically stated.

[0052] The specific implementation process is as follows:

[0053] The raw water to be processed is stored in the raw water tank 1. The raw water is pumped into the mixing tank 2 by a water pump. The flow rate detector 53 detects the amount of raw water entering the mixing tank 2. Then, the corresponding amount of treatment agent is input into the mixing tank 2 by the chemical dosing pump 55. The mixing shaft 49 is rotated by the servo motor 54 to fully mix the agent with the raw water. Then, the water enters the aeration tank 4. After being aerated and oxidized in the aeration tank 4, the water enters the iron and manganese removal filter 5, the quartz sand filter 6, and the activated carbon filter 7 in sequence to complete the preliminary treatment. Then, it enters the precision filter for filtration, and then enters the transition tank. Under the action of the first high-pressure pump 9, the water is sent from the reverse osmosis inlet pipe 11 into the first reverse osmosis RO membrane module 12 for separation. The obtained fresh water is discharged into the intermediate tank 19 along the reverse osmosis drain pipe 13, and the concentrated water is discharged along the first concentrated water discharge pipe 14. After the fresh water enters the intermediate tank 19, it flows into the pH adjustment tank 20. The pH value of the fresh water is adjusted by adding sodium hydroxide in the pH adjustment tank 20 to improve the filtration effect of the fresh water in the second reverse osmosis RO membrane module 23. After the pH value of the fresh water is adjusted in the pH adjustment tank 20, the fresh water is input into the second reverse osmosis RO membrane module 23 by the second high-pressure pump 21 for further separation. The obtained pure water enters the EDI unit 24 for positive and negative ion separation to reduce the water conductivity. The concentrated water flows into the raw water tank 1 along the second concentrated water discharge pipe 34 and is processed from the beginning. After the water separates positive and negative ions through the EDI unit 24, it is discharged from the ultraviolet liquid inlet pipe 27. The conductivity of the water source is detected by the conductivity detector 25. The water that does not meet the standard is discharged along the discharge pipe 26 into the second concentrated water discharge pipe 34, and then enters the raw water tank 1 for further treatment. The water that meets the detection standard of the conductivity detector 25 enters the flow main pipe 42 from the ultraviolet liquid inlet pipe 27. After ultraviolet sterilization is completed in the above manner, it flows into the pure water collection tank 32.

[0054] The liquid level sensor 56 is electrically connected to the control unit 33. The control unit 33 is composed of a central controller, etc. The storage time of ultrapure water in the pure water collection tank 32 is detected through the liquid level sensor 56, and a pure water storage critical value is set. If the specified time is reached, the pure water is discharged into the original water tank 1 for recycling treatment again; when the first reverse osmosis unit 10 needs to be cleaned, a chemical agent and clean water are added to the chemical agent tank 17. The clean water here can be the pure water in the pure water collection tank 32 or external added water. When the storage time of the pure water in the pure water collection tank 32 is approaching the set pure water storage critical value, the pure water in the pure water collection tank 32 can be used. The switching valve of the sub-permeation drain pipe is closed, and the cleaning agent in the chemical agent tank 17 enters the cleaning filter tank 18. After filtration, it enters the reverse osmosis water inlet pipe 11 along the forward cleaning pipe 16, then enters the first reverse osmosis RO membrane module 12 for cleaning, and then is discharged from the first concentrated water discharge pipe 14. During this period, the cleaning solution can react statically in the first reverse osmosis RO membrane module 12 for forty minutes and then flow for cleaning again. After the forward cleaning is completed, the cleaning solution flows along the reverse cleaning pipe 15, so that the cleaning solution enters the first reverse osmosis RO membrane module 12 for cleaning along the first concentrated water discharge pipe 14. A sewage discharge pipe is connected to the reverse osmosis water inlet pipe 11, and then the sewage flows from the reverse osmosis water inlet pipe 11 into the sewage discharge pipe for discharge. Comprehensive cleaning is completed through the liquid flow in two directions.

[0055] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A pure water and ultrapure water production system based on a mercury-free ultraviolet lamp, characterized in that: including, a raw water tank (1) for storing raw water to be treated; a pretreatment unit communicated with the raw water tank (1) and used for pretreating the raw water; a primary filtration unit communicated with the pretreatment unit and used for preliminarily filtering the raw water; a first reverse osmosis unit (10) communicated with the primary filtration unit and used for precisely filtering the raw water; a second reverse osmosis unit (22) communicated with the first reverse osmosis unit (10) and used for precisely filtering the water again; an EDI unit (24) communicated with the second reverse osmosis unit (22) and used for cleaning positive and negative ions in the water; an ultraviolet sterilization unit (28), the ultraviolet sterilization unit (28) includes a main flow pipe (42), a flow pipe (35), a compensation pipe (47) and a mercury-free ultraviolet lamp 37 (37), the flow pipe (35) is connected with a glass cover (36), the flow pipe (35) is provided with an installation groove (38), the mercury-free ultraviolet lamp (37) is slidably connected with the installation groove (38), the mercury-free ultraviolet lamp (37) is connected with an installation disc (39), the installation disc (39) is detachably connected with the flow pipe (35), two ends of the flow pipe (35) are respectively connected with a liquid inlet pipe (40) and a liquid discharge pipe (41), there are two groups of the main flow pipes (42), any one of the main flow pipes (42) is communicated with the EDI unit (24), the liquid inlet pipe (40) and the liquid discharge pipe (41) are respectively detachably connected with the two groups of the main flow pipes (42), the liquid inlet pipe (40) is connected with a first switch (43), the main flow pipe (42) on the side close to the liquid inlet pipe (40) is connected with a second switch (44), the main flow pipe (42) on the side close to the liquid discharge pipe (41) is connected with a third switch (45), the first switch (43), the second switch (44) and the third switch (45) cooperate with the flow pipe (35), there are several groups of the flow pipes (35), the two groups of the main flow pipes (42) are jointly connected with a first liquid outlet pipe (30), the main flow pipes (42) are respectively connected with one-way valves (46), the first liquid outlet pipe (30) is connected with a shunt pipe (29), the shunt pipe (29) is connected with a control valve, the compensation pipe (47) has the same structure as the flow pipe (35), the shunt pipe (29) is connected with the compensation pipe (47), and the compensation pipe (47) is connected with a second liquid outlet pipe (31); a pure water unit including a pure water collection tank (32), and the first liquid outlet pipe (30) and the second liquid outlet pipe (31) are respectively connected with the pure water collection tank (32); a cleaning unit for cleaning the first reverse osmosis unit (10); a control unit (33) for controlling the system passageway.

2. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 1, wherein: The pretreatment unit includes a stirring tank (2) and a chemical dosing tank (3). The stirring tank (2) is connected to a servo motor (54), and the output shaft of the servo motor (54) is connected to a stirring shaft (49). The stirring tank (2) is connected to a first stirring pipe (50), a second stirring pipe (51), and a chemical dosing and stirring pipe (52). The first stirring pipe (50) is connected to the raw water tank (1), the second stirring pipe (51) is connected to the primary filtration unit, the chemical dosing tank (3) is connected to a chemical dosing pump (55), the chemical dosing and stirring pipe (52) is connected to the chemical dosing pump (55), and flow detectors (53) are respectively connected to the first stirring pipe (50) and the second stirring pipe (51).

3. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 2, wherein: The primary filtration unit includes an aeration tank (4), an iron and manganese removal filter (5), a quartz sand filter (6), and an activated carbon filter (7). The second stirring pipe (51) communicates with the aeration tank (4), and the aeration tank (4), the iron and manganese removal filter (5), the quartz sand filter (6), and the activated carbon filter (7) are sequentially communicated through pipelines.

4. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 3, characterized in that: The first reverse osmosis unit (10) includes a precision filter (8), a first reverse osmosis RO membrane module (12), and a first high-pressure pump (9). The precision filter (8) communicates with the activated carbon filter (7), the precision filter (8) communicates with the first high-pressure pump (9). The first reverse osmosis RO membrane module (12) is connected with a reverse osmosis water inlet pipe (11), a reverse osmosis drain pipe (13), and a first concentrated water discharge pipe (14). The reverse osmosis water inlet pipe (11) is connected to the first high-pressure pump (9), and the reverse osmosis drain pipe (13) is connected to the water inlet end of the second reverse osmosis unit (22).

5. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 4, characterized in that: The second reverse osmosis unit (22) includes a second reverse osmosis RO membrane module (23), an intermediate tank (19), a PH adjustment tank (20), and a second high-pressure pump (21). The reverse osmosis drain pipe (13) communicates with the intermediate tank (19). The second reverse osmosis RO membrane module (23) is connected to the intermediate tank (19) through the second high-pressure pump (21) and pipelines. The second reverse osmosis RO membrane module (23) is connected with a second concentrated water discharge pipe (34), and the second concentrated water discharge pipe (34) communicates with the raw water tank (1). The pure water outlet end of the second reverse osmosis RO membrane module (23) communicates with the EDI unit (24), and the EDI unit (24) is connected with an ultraviolet liquid inlet pipe (27), and the ultraviolet liquid inlet pipe (27) communicates with any one of the flow main pipes (42).

6. The water production system for pure water and ultrapure water based on a mercury-free ultraviolet lamp according to claim 4, characterized in that: The cleaning unit includes a chemical agent tank (17) and a cleaning and filtering tank (18). The chemical agent tank (17) communicates with the cleaning and filtering tank (18). The cleaning and filtering tank (18) is connected with a forward cleaning pipe (16), the forward cleaning pipe (16) communicates with the reverse osmosis water inlet pipe (11), the forward cleaning pipe (16) is connected with a reverse cleaning pipe (15), the reverse cleaning pipe (15) communicates with the first concentrated water discharge pipe (14), and the pure water collection tank (32) communicates with the chemical agent tank (17).

7. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 5, wherein: The ultraviolet liquid inlet pipe (27) is connected to a conductivity detector (25), the ultraviolet liquid inlet pipe (27) is connected to a discharge pipe (26), and the discharge pipe (26) communicates with a second concentrated water discharge pipe (34).

8. The pure water and ultrapure water production system based on a mercury-free ultraviolet lamp according to claim 1, wherein: The pure water collection tank (32) is connected to a liquid level sensor (56), there are several groups of the pure water collection tanks (32), and the pure water collection tank (32) communicates with the raw water tank (1).

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