Laboratory pure water preparation and wastewater recycling system

Abstract

This utility model discloses a laboratory pure water preparation and wastewater recycling system, including a data processing module, a control module, a pure water preparation system, a wastewater recycling system, a three-way valve, a flow metering device, a pure water storage tank, a water quality testing device, and a purified water storage pool. The first end of the three-way valve is connected to an external source water delivery device, the second end is connected to the outlet of the purified water storage pool, and the third end is connected to the inlet of the pure water preparation system. The outlet of the pure water preparation system, the flow metering device, and the inlet of the pure water storage tank are sequentially connected. The outlet of the wastewater recycling system, the water quality testing device, and the inlet of the purified water storage pool are sequentially connected. The data processing module and the control module are electrically connected to the pure water preparation system, the wastewater recycling system, the flow metering device, and the water quality testing device, respectively. The control module is also electrically connected to the three-way valve, and the data processing module is electrically connected to the control module. This system solves the problems of supply and demand mismatch and lack of linkage.

Description

Technical Field

[0001] This utility model relates to the design of pure water preparation and wastewater recycling systems, and particularly to a laboratory pure water preparation and wastewater recycling system. Background Technology

[0002] In the daily operation of laboratories, pure water is an indispensable basic resource, widely used in high-precision experimental processes such as reagent preparation, instrument cleaning, and cell culture. To meet different experimental needs, technicians have developed various pure water preparation systems, including reverse osmosis (RO), electrodeionization (EDI), and mixed-bed ion exchange processes. However, these systems often face a key problem in actual operation: the amount of pure water produced does not match the demand. For example, some experiments may only require a small amount of ultrapure water, but the system defaults to operating at a fixed capacity, leading to excessive water accumulation. This not only wastes energy but also causes water quality degradation (decreased resistivity or microbial growth) due to prolonged storage. Statistics show that approximately 20% to 30% of pure water in laboratories is forced to be discharged because it is not used in a timely manner, increasing unnecessary operating costs. At the same time, pure water is converted into wastewater after use, and its composition may contain residual organic matter, inorganic salts, or microorganisms. Traditional wastewater treatment systems are usually designed independently and lack linkage with the pure water preparation system. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology, such as the mismatch between system supply and demand and the lack of linkage, and to provide a laboratory pure water preparation and wastewater recycling system.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0005] A laboratory pure water preparation and wastewater recycling system includes a data processing module, a control module, a pure water preparation system, a wastewater recycling system, a first three-way valve, a first flow metering device, a first pure water storage tank, a first water quality testing device, and a purified water storage pool.

[0006] The first end of the first three-way valve is connected to an external source water delivery device, the second end is connected to the outlet of the purified water storage tank, and the third end is connected to the inlet of the pure water preparation system. The outlet of the pure water preparation system, the first flow metering device, and the inlet of the first pure water storage tank are connected in sequence. The outlet of the wastewater recycling system, the first water quality testing device, and the inlet of the purified water storage tank are connected in sequence.

[0007] The data processing module and the control module are electrically connected to the pure water preparation system, the wastewater recycling system, the first flow metering device, and the first water quality detection device, respectively. The control module is also electrically connected to the first three-way valve, and the data processing module is electrically connected to the control module.

[0008] Preferably, the pure water preparation system includes a first booster pump, a sand filter, a carbon filter, a water softener, a first filter, a first high-pressure pump, a first reverse osmosis unit, a second pure water storage tank, a transfer pump, a sterilizer, and a second filter connected in sequence. The outlet of the second filter, the first flow metering device, and the first pure water storage tank are connected in sequence. The first booster pump, the water softener, the first high-pressure pump, the first reverse osmosis unit, the transfer pump, and the sterilizer are electrically connected to the control module. The pore size of the first filter is less than or equal to 5 micrometers, and the pore size of the second filter is less than or equal to 0.22 micrometers.

[0009] Preferably, the pure water preparation system further includes a second water quality detection device, which is connected between the second filter and the first flow metering device, and is electrically connected to the data processing module and the control module respectively.

[0010] Preferably, the pure water preparation system further includes a second booster pump, an electro-deionization device, a third water quality detection device, a second flow metering device, and an ultrapure water storage tank connected in sequence. The inlet of the second booster pump is connected to the outlet of the first pure water storage tank. The second flow metering device and the third water quality detection device are electrically connected to the data processing module, and the second booster pump, the electro-deionization device, the second flow metering device, and the third water quality detection device are electrically connected to the control module.

[0011] Preferably, the wastewater recycling system includes a wastewater equalization tank, a third booster pump, a neutralization tank, a reaction tank, a sedimentation tank, and a membrane bioreactor connected in sequence. It also includes a second high-pressure pump and a second reverse osmosis unit. The outlet of the second reverse osmosis unit is the outlet of the wastewater recycling system. A liquid level sensor is installed in the wastewater equalization tank. A membrane bioreactor is installed in the membrane bioreactor. An acid-base sensor and an acid-base dosing device are installed in the neutralization tank. A flocculant dosing device is installed in the reaction tank. The outlet of the membrane bioreactor, the second high-pressure pump, and the inlet of the second reverse osmosis unit are connected in sequence. The data processing module is also electrically connected to the liquid level sensor and the acid-base sensor. The control module is also electrically connected to the liquid level sensor, the third booster pump, the acid-base sensor, the acid-base dosing device, the flocculant dosing device, the membrane bioreactor, the second high-pressure pump, and the second reverse osmosis unit.

[0012] Preferably, the bottoms of the first pure water storage tank, the second pure water storage tank, the ultrapure water storage tank, the wastewater equalization tank, the neutralization tank, the reaction tank, the membrane bioreactor, and the purified water storage tank are all inclined or conical, with their corresponding outlets located at the lowest point of their respective bottoms. The bottom of the sedimentation tank is also inclined or conical, with its sludge outlet located at the lowest point of its bottom. A first stirring device is installed in the neutralization tank, and a second stirring device is installed in the reaction tank. The first stirring device and the second stirring device are electrically connected to the control module, respectively.

[0013] Preferably, the pure water preparation system further includes a second three-way valve and a third three-way valve. The first end of the second three-way valve is connected to the outlet of the water quality testing device, the second end of the second three-way valve is connected to the inlet of the first flow metering device, and the third end of the second three-way valve is connected to the inlet of the sand filter, the carbon filter, the water softener, the first filter, the first reverse osmosis unit, the sterilizer, or the second filter. The first end of the third three-way valve is connected to the outlet of the third water quality testing device, the second end of the third three-way valve is connected to the inlet of the second metering device, and the third end of the third three-way valve is connected to the inlet of the sand filter, the carbon filter, the water softener, the first filter, the first reverse osmosis unit, the sterilizer, the second filter, or the electro-deionization device. The second and third three-way valves are electrically connected to the control module.

[0014] Preferably, the system further includes a fourth three-way valve, the first end of which is connected to the outlet of the first water quality testing device, the second end of which is connected to the purified water storage tank, and the third end of which is connected to the inlet of the wastewater regulating tank, the neutralization tank, the reaction tank, the sedimentation tank, the membrane reaction tank, or the second reverse osmosis unit. The fourth three-way valve is electrically connected to the control module.

[0015] Preferably, the wastewater recycling system further includes a first stop valve, a second stop valve, a third stop valve, and a fourth stop valve. The first stop valve is connected between the outlet of the third booster pump and the inlet of the neutralization tank. The second stop valve is connected between the outlet of the neutralization tank and the inlet of the reaction tank. The third stop valve is connected between the outlet of the reaction tank and the inlet of the sedimentation tank. The fourth stop valve is connected between the outlet of the sedimentation tank and the inlet of the membrane bioreactor. The first to fourth stop valves are electrically connected to the control module.

[0016] A laboratory pure water preparation and wastewater recycling system includes the aforementioned laboratory pure water preparation and wastewater recycling system, wherein a first water quality testing device is installed in the purified water storage tank to replace the outlet of the wastewater recycling system, and the first water quality testing device and the inlet of the inlet storage tank are sequentially connected.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention measures the amount of pure water produced by a first flow metering device and transmits this information to a data processing module. When the data processing module determines that the produced pure water has reached the required amount, it sends information to a control module. The control module then controls the pure water production system to stop producing pure water, thus achieving a balance between supply and demand, improving energy efficiency, and avoiding unnecessary waste. Furthermore, a first water quality detection device transmits the water quality information of the wastewater after treatment by the wastewater recycling system to the data processing module. When the data processing module determines that the water quality meets the discharge standards, it sends information to the control module. The control module then controls the first and third ends of the first three-way valve to stop conducting, while controlling the second and third ends to conduct, so that the wastewater treated by the wastewater recycling system can be used as the source water for producing pure water. This achieves closed-loop operation between the pure water production system and the wastewater recycling system, i.e., it realizes the linkage between the two systems. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a laboratory pure water preparation and wastewater recycling system disclosed in one embodiment;

[0020] Figure 2This is a first schematic diagram showing the connection and electrical connection of the internal components of a laboratory pure water preparation system and a wastewater recycling system disclosed in one embodiment.

[0021] Figure 3 This is a second schematic diagram showing the connection and electrical connection of the internal components of a laboratory pure water preparation system and a wastewater recycling system disclosed in one embodiment.

[0022] Figure 4 This is a schematic diagram showing the interconnections and electrical connections of internal components in a laboratory pure water preparation and wastewater recycling system disclosed in one embodiment;

[0023] Figure 5 This is a schematic diagram showing that the bottom of the purified water storage tank in a laboratory pure water preparation and wastewater recycling system disclosed in one embodiment is inclined.

[0024] Figure 6 This is a schematic diagram showing that the bottom of the purified water storage tank in a laboratory pure water preparation and wastewater recycling system disclosed in one embodiment is conical;

[0025] Figure 7 A schematic diagram of a laboratory pure water preparation and wastewater recycling system, as disclosed in one embodiment, includes a second three-way valve;

[0026] Figure 8 A schematic diagram of a laboratory pure water preparation and wastewater recycling system, as disclosed in one embodiment, includes a third three-way valve;

[0027] Figure 9 A schematic diagram of a laboratory pure water preparation and wastewater recycling system, as disclosed in one embodiment, includes a fourth three-way valve;

[0028] Figure 10 This is a schematic diagram of a laboratory pure water preparation and wastewater recycling system, including a stop valve, as disclosed in one embodiment.

[0029] Figure 11 This is a schematic diagram of a laboratory pure water preparation and wastewater recycling system, as disclosed in another embodiment.

[0030] Label Explanation:

[0031] 10-Data Processing Module; 20-Control Module; 30-Pure Water Preparation System; 301-First Booster Pump; 302-Sand Filter; 303-Carbon Filter; 304-Water Softener; 305-First Filter; 306-First High-Pressure Pump; 307-First Reverse Osmosis Unit; 308-Second Pure Water Storage Tank; 309-Transfer Pump; 310-Sterilizer; 311-Second Filter; 312-Second Water Quality Detection Module; 313-Second Booster Pump; 314-Electrodeionization Device; 315-Third Water Quality Detection Device; 316-Second Flow Metering Device; 317-Ultrapure Water Storage Tank; 318-Second Three-Way Valve; 319-Third Three-Way Valve; 40-Wastewater Recycling System; 401-Wastewater Adjustment Tank; 402-Liquid Level Sensor; 403-Third booster pump; 404-Neutralization tank; 405-Acid-base sensor; 406-Acid-base dosing device; 407-Reaction tank; 408-Flocculant dosing device; 409-Sedimentation tank; 410-Membrane bioreactor tank; 411-Membrane bioreactor; 412-Second high-pressure pump; 413-Second reverse osmosis unit; 414-First stirring device; 415-Second stirring device; 416-First stop valve; 417-Second stop valve; 418-Third stop valve; 419-Fourth stop valve; 50-First three-way valve; 60-First flow metering device; 70-First pure water storage tank; 80-First water quality testing device; 90-Purified water storage tank; 100-Fourth three-way valve; 110-External source water delivery device. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0033] In the attached diagrams below, the thick solid lines represent pipes, the thin solid lines represent electrical connections, the black dots represent common connection points, and the intersections of thin solid lines without black dots indicate that there is no electrical connection between the intersections. The specific wiring method can be flexibly adjusted.

[0034] like Figure 1As shown, a laboratory pure water preparation and wastewater recycling system includes a data processing module 10, a control module 20, a pure water preparation system 30, a wastewater recycling system 40, a first three-way valve 50, a first flow metering device 60, a first pure water storage tank 70, a first water quality testing device 80, and a purified water storage pool 90. The first end of the first three-way valve 50 is connected to an external source water delivery device 110, the second end is connected to the outlet of the purified water storage pool 90, and the third end is connected to the inlet of the pure water preparation system 30. The outlet of the pure water preparation system 30 and the first flow meter... The inlet of the measuring device 60 and the first pure water storage tank 70 are connected in sequence. The outlet of the wastewater recycling system 40, the first water quality detection device 80, and the inlet of the purified water storage tank 90 are connected in sequence. The data processing module 10 and the control module 20 are electrically connected to the pure water preparation system 30, the wastewater recycling system 40, the first flow metering device 60, and the first water quality detection device 80, respectively. The control module 20 is also electrically connected to the first three-way valve 50. The data processing module 10 is electrically connected to the control module 20.

[0035] Based on the above structure, the operating principle of the laboratory pure water preparation and wastewater recycling system in this embodiment is as follows: The laboratory's pure water demand is set in the data processing module 10. The first flow metering device 60 measures the amount of pure water to be prepared and transmits this data to the data processing module 10. When the data processing module 10 determines that the prepared pure water has reached the demand, it sends information to the control module 20. The control module 20 then controls the pure water preparation system 30 to stop preparing pure water. The wastewater treatment discharge standard is set in the data processing module 10. The first water quality detection device 80 transmits the water quality information of the wastewater after treatment by the wastewater recycling system 40 to the data processing module 10. When the data processing module 10 determines that the water quality has reached the discharge standard, it sends information to the control module 20. The control module 20 then controls the first and third ends of the first three-way valve 50 to stop conducting, and controls the second and third ends to conduct, so that the wastewater treated by the wastewater recycling system 40 can be used as the source water for preparing pure water. The control module 20 also controls the opening and closing of devices, components, or systems electrically connected to it.

[0036] like Figure 2As shown, the pure water preparation system 30 includes a first booster pump 301, a sand filter 302, a carbon filter 303, a water softener 304, a first filter 305, a first high-pressure pump 306, a first reverse osmosis unit 307, a second pure water storage tank 308, a transfer pump 309, a sterilizer 310, a second filter 311, and a second water quality testing device 312, connected in sequence. Each of the sand filter 302, carbon filter 303, water softener 304, first filter 305, first reverse osmosis unit 307, and second filter 311 has a drain outlet. Since the water softener 304 produces salt during water softening, the salt is discharged... The water is stored in an external salt tank. The first reverse osmosis unit 307 produces concentrated water, which is discharged from its own drain outlet. The inlet of the first booster pump 301 serves as the inlet of the pure water preparation system 30. The inlets of the second water quality testing device 312, the first flow metering device 60, and the first pure water storage tank 70 are connected in sequence. The outlet of the first pure water storage tank 70 transmits pure water to various water points in the laboratory through a transmission branch pipe. When pure water is needed, laboratory personnel can obtain pure water by turning on the faucet on the transmission branch pipe at the water point. The length of the transmission branch pipe should be less than or equal to 30 times the diameter of the transmission branch pipe to reduce stagnant water pipes. The distribution of transmission branches and water usage points is not shown in the figure; the first booster pump 301, the water softener 304, the first high-pressure pump 306, the first reverse osmosis unit 307, the transmission pump 309, the sterilizer 310, and the second water quality detection device 312 are electrically connected to the control module 20, and the second water quality detection device 312 is also electrically connected to the data processing module 10; the pore size of the first filter 305 is less than or equal to 5 micrometers, and the pore size of the second filter 311 is less than or equal to 0.22 micrometers; the pure water preparation system 30 and the wastewater recycling system 40 can achieve system supply and demand balance and linkage between the two systems even when they are existing systems; the sterilizer 310 is an ultraviolet sterilizer or an ozone sterilizer.

[0037] like Figure 3As shown, the pure water preparation system 30 further includes a second booster pump 313, an electrodeionization (EDI) device 314, a third water quality detection device 315, a second flow metering device 316, and an ultrapure water storage tank 317 connected in sequence. The inlet of the second booster pump 313 is also connected to the outlet of the first pure water storage tank 70. The electrodeionization device 314 generates concentrated water during filtration and discharges it from its drain outlet. The second flow metering device 316 and the third water quality detection device 315 are electrically connected to the data processing module 10. The second booster pump 313, the second flow metering device 316, and the third water quality detection device 315 are connected in sequence. The electrodeionization device 314, the third water quality detection device 315, and the second flow metering device 316 are electrically connected to the control module 20. Since the laboratory uses more pure water than ultrapure water, pure water can be used to prepare ultrapure water when there is a need for it. The second flow metering device 316 is used to measure the amount of ultrapure water produced. When the data processing module 10 determines that the amount of ultrapure water produced has reached the required amount, the preparation of ultrapure water is stopped. The preparation of pure water and ultrapure water can be carried out simultaneously or separately, depending on the needs.

[0038] like Figure 4As shown, the wastewater recycling system 40 includes a wastewater equalization tank 401, a third booster pump 403, a neutralization tank 404, a reaction tank 407, a sedimentation tank 409, and a membrane bioreactor 410 connected in sequence. It also includes a second high-pressure pump 412 and a second reverse osmosis unit 413. The outlet of the second reverse osmosis unit 413 is the outlet of the wastewater recycling system 40. The second reverse osmosis unit 413 produces concentrated water during filtration, which is discharged from its own drain outlet. The water equalization tank 401 is connected to the discharge outlet of the aforementioned devices. A liquid level sensor 402 is installed in the wastewater equalization tank 401. An acid-base sensor 405, an acid-base dosing device 406, and a first stirring device 414 are installed in the neutralization tank 404. A flocculant dosing device 408 and a second stirring device 415 are installed in the reaction tank 407. A membrane bioreactor 411 is installed in the membrane bioreactor 410. The effluent outlet of the membrane bioreactor 411 and the second high-pressure pump are also connected. 412 and the inlet of the second reverse osmosis host 413 are connected in sequence. The data processing module 10 is also electrically connected to the liquid level sensor 402 and the acid-base sensor 405 respectively. The control module 20 is also electrically connected to the liquid level sensor 402, the third booster pump 403, the acid-base sensor 405, the acid-base dosing device 406, the first stirring device 414, the flocculant dosing device 408, the second stirring device 415, the membrane bioreactor 411, the second high-pressure pump 412 and the second reverse osmosis host 413 respectively. The wastewater equalization tank 401 is connected to the wastewater recovery branch pipe of the laboratory to receive the wastewater generated by the laboratory. For example, one end of the wastewater recovery branch pipe is connected to the washing tank of the laboratory, and the other end is connected to the wastewater equalization tank 401. Thus, the wastewater used by the laboratory can be transferred to the wastewater equalization tank 401 through the washing tank. The wastewater recovery branch pipe is not shown in the figure. A large amount of biologically active sludge is laid in the membrane bioreactor 410. The purpose of installing the liquid level sensor 402 is to detect the amount of wastewater in the wastewater equalization tank 401. Wastewater can be recycled only when a certain amount is reached, as needed. The specific location of the liquid level sensor 402 in the wastewater equalization tank 401 depends on the specific type of liquid level sensor 402. The acid-base sensor 405 can be installed at the bottom of the neutralization tank 404 so that the acid-base sensor is fully submerged in the wastewater in the neutralization tank 404. The acid-base dosing device 406 can be installed on the side wall of the neutralization tank 404. The membrane bioreactor 411 can be installed at the bottom or lower middle part of the membrane bioreactor 410 so that the membrane bioreactor 411 can filter all the water in the membrane bioreactor 410. Figure 4The relationships shown are only to indicate that they are installed inside the corresponding devices, not suspended in the air; the first stirring device 414 is set up to ensure that the neutralization reaction in the neutralization tank 404 is sufficient, so that the acidity or alkalinity of the wastewater is as neutral as possible, so as to reduce the impact on the subsequent devices; the second stirring device 415 is set up to ensure that the wastewater reacts fully with the flocculant, so that flocs can be fully formed and precipitated in the sedimentation tank 409.

[0039] The first flow metering device 60 and the second flow metering device 316 are electromagnetic flow meters or differential pressure flow meters. The first water quality detection device 80, the second water quality detection device 312 and the third water quality detection device 315 are resistance meters. The liquid level sensor 402 is a float-type liquid level sensor or a capacitive liquid level sensor. The first reverse osmosis unit 307 and the second reverse osmosis unit 413 are equipped with reverse osmosis membranes to achieve water filtration.

[0040] The bottoms of the second pure water storage tank 308, the first pure water storage tank 70, the ultrapure water storage tank 317, the wastewater equalization tank 401, the neutralization tank 404, the reaction tank 407, the membrane bioreactor 410, and the purified water storage tank 90 are all inclined or conical, with their corresponding outlets located at the lowest point of their respective bottoms. The bottom of the sedimentation tank 409 is also inclined or conical, with its sludge outlet located at the lowest point of its bottom. This allows the water or sludge stored inside to be discharged under gravity, using mechanical structures to replace electrical devices as much as possible, thereby reducing energy consumption and making it environmentally friendly. Figure 5 The diagram shows the bottom of the water purification storage tank 90 is sloping. It is only for illustrative purposes and the relevant inlet and outlet are not shown in the diagram. Figure 6 This is a schematic diagram showing that the bottom of the water purification storage tank 90 is conical. It is only for illustrative purposes and the relevant inlet and outlet are not shown in the diagram.

[0041] The pure water preparation system 30 also includes a second three-way valve 318 and a third three-way valve 319; as shown in the figure Figure 7 As shown, the first end of the second three-way valve 318 is connected to the outlet of the second water quality testing device 312, the second end of the second three-way valve 318 is connected to the inlet of the first flow metering device 60, and the third end of the second three-way valve 318 is connected to the inlet of the sand filter 302. The second three-way valve 318 is electrically connected to the control module 20. The third end of the second three-way valve 318 can also be connected to the inlet of the carbon filter 303, the water softener 304, the first filter 305, the first reverse osmosis unit 307, the sterilizer 310, or the second filter 311. Figure 8As shown, the first end of the third three-way valve 319 is connected to the outlet of the third water quality testing device 315, the second end of the third three-way valve 319 is connected to the inlet of the second flow metering device 316, the third end of the third three-way valve 319 is connected to the inlet of the electro-deionization device 314, and the third three-way valve 319 is electrically connected to the control module 20; the third end of the third three-way valve 319 can also be connected to the inlet of the sand filter 302, the carbon filter 303, the water softener 304, the first filter 305, the first reverse osmosis unit 307, the sterilizer 310, or the second filter 311. When the pure water at the outlet of the second filter 311 does not meet the requirements, the first and second ends of the second three-way valve 318 are closed, while the first and third ends are open. This prevents the substandard pure water from being discharged into the first pure water storage tank 70, thus preventing contamination of the pure water stored therein, and allowing it to re-enter the purification process. Similarly, the control principle of the third three-way valve 319 is the same as that of the second three-way valve 318, and will not be elaborated here.

[0042] like Figure 9 As shown, the laboratory pure water preparation and wastewater recycling system of this embodiment also includes a fourth three-way valve 100. The first end of the fourth three-way valve 100 is connected to the outlet of the first water quality testing device 80, the second end of the fourth three-way valve 100 is connected to the inlet of the purified water storage tank 90, and the third end of the fourth three-way valve 100 is connected to the wastewater regulating tank 401. The fourth three-way valve 100 is electrically connected to the control module. The third end of the fourth three-way valve 100 can also be connected to the inlet of the neutralization tank 404, the reaction tank 407, the sedimentation tank 409, the membrane bioreactor 410, or the second reverse osmosis unit 413. The working principle of the fourth three-way valve 100 is the same as that of the second three-way valve 318, and will not be described again here.

[0043] like Figure 10As shown, the wastewater recycling system 40 further includes a first stop valve 416, a second stop valve 417, a third stop valve 418, and a fourth stop valve 419. The first stop valve 416 connects the outlet of the third booster pump 403 to the inlet of the neutralization tank 404; the second stop valve 417 connects the outlet of the neutralization tank 404 to the inlet of the reaction tank 407; the third stop valve 418 connects the outlet of the reaction tank 407 to the inlet of the sedimentation tank 409; and the fourth stop valve 419 connects the outlet of the sedimentation tank 409 to the inlet of the membrane bioreactor 410. The first stop valve 416, the second stop valve 417, the third stop valve 418, and the fourth stop valve 419 are electrically connected to the control module 20. When the acidity or alkalinity of the wastewater in neutralization tank 404 is not sufficiently neutralized, the first stop valve 416 and the second stop valve 417 are closed to ensure that the wastewater in neutralization tank 404 is fully neutralized. After sufficient neutralization, the second stop valve 417 is opened, and the wastewater in neutralization tank 404 is discharged into reaction tank 407. After discharge, the first stop valve 416 is opened again, and the second stop valve 417 is closed, so that the wastewater in wastewater regulating tank 401 is discharged back into neutralization tank 404 for neutralization. The amount discharged each time can be determined according to needs. Similarly, the second stop valve 417 and the third stop valve 418 work together to make the reaction in reaction tank 407 more thorough, and the third stop valve 418 and the fourth stop valve 419 work together to make the reaction in sedimentation tank 409 more thorough. The relevant control process will not be described in detail here.

[0044] In the above embodiments, "connection" refers to connection through pipes. These pipes, including the aforementioned transmission branch pipes and wastewater recovery branch pipes, can be made of polyvinyl chloride (PVC), polypropylene (PP), acrylonitrile-butadiene-styrene (ABR), or polyvinylidene fluoride (PVDF). When assembling the relevant components to form a laboratory pure water preparation and wastewater recovery system, contaminated pipes, three-way valves, and stop valves can be scrubbed with a 1%–2% alkali (NaOH) solution to remove grease and grime, and then rinsed with tap water until neutral. They can also be soaked in a 1%–2% hydrochloric acid (HCl) solution for 2–4 hours to remove rust, metal ions, and oxides, and then rinsed with water until neutral. Before operation and commissioning, the following steps must be performed: first, perform a water pressure test on the installed pure water preparation system 30; only after passing the test can the system be operated. Then, use 3%–5% hydrogen peroxide to circulate and clean the pipes for 40 minutes to achieve disinfection and sterilization. Finally, use pure water or reverse osmosis water supplied by the pure water station to flush away any residual chemicals in the pipes until the water quality at the laboratory pure water usage point meets the specified water quality requirements.

[0045] The workflow of the laboratory pure water preparation and wastewater recycling system in the above embodiment is as follows:

[0046] The working process of the pure water preparation system 30 is as follows: First, the external source water delivery device 110 transmits source water to the first booster pump 301. The first booster pump 301 increases the outlet pressure of the source water and transmits it to the sand filter 302. After filtration, the water in the sand filter 302 enters the carbon filter 303 for further filtration. The filtered water then enters the water softener 304, which discharges the salts in the water to an external salt tank. The softened water from the water softener 304 then enters a filter with a filtration accuracy of 5μm for further filtration. The filtered water then enters the first high-pressure pump 306, which pressurizes and outputs the softened water to the first reverse osmosis unit 307. The first reverse osmosis unit 307 performs reverse osmosis through its internal reverse osmosis membrane and outputs the purified water to the second pure water storage tank. In storage tank 308, the water in the second pure water storage tank 308 is transported to the ultraviolet sterilizer by the transfer pump 309. The sterilized water is filtered through a filter with a filtration accuracy of 0.22μm. The filtered water is stored in the first pure water storage tank 70, which is the product water storage tank. The pure water in the first pure water storage tank 70 is transferred to various water points in the laboratory through the transfer branch pipe. The water points are close to or adjacent to the laboratory testing equipment. When the laboratory occasionally needs ultrapure water for experiments, the pure water in the first pure water storage tank 70 can be transferred to the second booster pump 313 to pressurize the pure water and transfer it to the electro-deionization device 314 for treatment. The pure water after being treated by the electro-deionization device 314 is tested by a resistance meter. When the pure water quality meets the requirements, it is stored in the ultrapure water tank.

[0047] The workflow of the wastewater recycling system 40 is as follows: After the experiment is completed, laboratory wastewater is generated. First, the laboratory wastewater enters the wastewater equalization tank 401 through the wastewater recycling branch pipe. The wastewater in the equalization tank 401 is pressurized by the third booster pump 403 and transferred to the neutralization tank 404. The neutralization tank 404 determines whether the wastewater is acidic or alkaline based on the acid-base sensor 405 in the tank. According to the nature of the wastewater, acid or alkali is added using the acid-base dosing device 406 to neutralize the wastewater in the neutralization tank 404. The neutralized wastewater is then transferred to the reaction tank 407, where it is further treated by the flocculant dosing device 4. 08. Flocculant is added to treat the wastewater by flocculation. The flocculated wastewater is then transferred to sedimentation tank 409. Particulate impurities in the wastewater in sedimentation tank 409 settle and form sludge, which is then discharged. The settled water is then transferred to membrane bioreactor 410. Membrane bioreactor 411 in membrane bioreactor 410 filters the wastewater. The filtered wastewater is then pressurized by a second high-pressure pump 412 and transferred to the reverse osmosis membrane in the second reverse osmosis unit 413 for reverse osmosis filtration. The filtered purified water is then transferred to purified water storage tank 90. ​​The water in purified water storage tank 90 can be recycled or discharged.

[0048] As an alternative embodiment, the laboratory pure water preparation and wastewater recycling system includes the features of the laboratory pure water preparation and wastewater recycling system disclosed in the above embodiments. However, the first water quality testing device 80 is installed in the purified water storage tank 90, the second water quality testing device 312 is installed in the first pure water storage tank 70, and the third water quality testing device 315 is installed in the ultrapure water storage tank 317. Therefore, the first water quality testing device 80, the second water quality testing device 312, and the third water quality testing device 315 do not need to be connected to any other device. Thus, the devices in the above embodiments that have a communication or electrical connection with the first water quality testing device 80, the second water quality testing device 312, and the third water quality testing device 315 no longer have the corresponding relationship. Figure 11 The diagram shows the first water quality testing device 80 installed in the purified water storage tank 90. ​​The installation locations of the second water quality testing device 312 and the third water quality testing device 315 are similar and will not be shown in detail.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory pure water preparation and waste water recovery system, characterized by, It includes a data processing module (10), a control module (20), a pure water preparation system (30), a wastewater recycling system (40), a first three-way valve (50), a first flow metering device (60), a first pure water storage tank (70), a first water quality testing device (80), and a purified water storage pool (90). The first end of the first three-way valve (50) is connected to the external source water delivery device, the second end is connected to the outlet of the purified water storage tank (90), and the third end is connected to the inlet of the pure water preparation system (30). The outlet of the pure water preparation system (30), the first flow metering device (60), and the inlet of the first pure water storage tank (70) are connected in sequence. The outlet of the wastewater recycling system (40), the first water quality detection device (80), and the inlet of the purified water storage tank (90) are connected in sequence. The data processing module (10) and the control module (20) are electrically connected to the pure water preparation system (30), the wastewater recycling system (40), the first flow metering device (60) and the first water quality detection device (80), respectively. The control module (20) is also electrically connected to the first three-way valve (50). The data processing module (10) is electrically connected to the control module (20).

2. The laboratory pure water preparation and wastewater recycling system according to claim 1, characterized in that, The pure water preparation system includes a first booster pump, a sand filter, a carbon filter, a water softener, a first filter, a first high-pressure pump, a first reverse osmosis unit, a second pure water storage tank, a transfer pump, a sterilizer, and a second filter connected in sequence. The inlet of the first booster pump serves as the inlet of the pure water preparation system, and the outlet of the second filter serves as the outlet of the pure water preparation system. The first booster pump, the water softener, the first high-pressure pump, the first reverse osmosis unit, the transfer pump, and the sterilizer are all electrically connected to the control module. The pore size of the first filter is less than or equal to 5 micrometers, and the pore size of the second filter is less than or equal to 0.22 micrometers.

3. The laboratory pure water preparation and wastewater recycling system according to claim 2, characterized in that, The pure water preparation system further includes a second water quality detection device, which is connected between the second filter and the first flow metering device. The second water quality detection device is electrically connected to the data processing module and the control module, respectively.

4. The laboratory pure water preparation and wastewater recycling system according to claim 3, characterized in that, The pure water preparation system further includes a second booster pump, an electro-deionization device, a third water quality detection device, a second flow metering device, and an ultrapure water storage tank connected in sequence. The inlet of the second booster pump is connected to the outlet of the first pure water storage tank. The second flow metering device and the third water quality detection device are electrically connected to the data processing module, and the second booster pump, the electro-deionization device, the second flow metering device, and the third water quality detection device are electrically connected to the control module.

5. The laboratory pure water preparation and wastewater recycling system according to claim 4, characterized in that, The wastewater recovery system includes a wastewater equalization tank, a third booster pump, a neutralization tank, a reaction tank, a sedimentation tank, and a membrane bioreactor connected in sequence. It also includes a second high-pressure pump and a second reverse osmosis unit. The outlet of the second reverse osmosis unit is the outlet of the wastewater recovery system. A liquid level sensor is installed in the wastewater equalization tank. A membrane bioreactor is installed in the membrane bioreactor. An acid-base sensor and an acid-base dosing device are installed in the neutralization tank. A flocculant dosing device is installed in the reaction tank. The outlet of the membrane bioreactor, the second high-pressure pump, and the inlet of the second reverse osmosis unit are connected in sequence. The data processing module is electrically connected to the liquid level sensor and the acid-base sensor. The control module is electrically connected to the liquid level sensor, the third booster pump, the acid-base sensor, the acid-base dosing device, the flocculant dosing device, the membrane bioreactor, the second high-pressure pump, and the second reverse osmosis unit.

6. The laboratory pure water preparation and wastewater recycling system according to claim 5, characterized in that, The bottoms of the first pure water storage tank, the second pure water storage tank, the ultrapure water storage tank, the wastewater equalization tank, the neutralization tank, the reaction tank, the membrane bioreactor, and the purified water storage tank are all inclined or conical, with their corresponding outlets located at the lowest point of their respective bottoms. The bottom of the sedimentation tank is also inclined or conical, with its sludge outlet located at the lowest point of its bottom. A first stirring device is installed in the neutralization tank, and a second stirring device is installed in the reaction tank. The first stirring device and the second stirring device are electrically connected to the control module, respectively.

7. The laboratory pure water preparation and wastewater recycling system according to claim 5, characterized in that, The pure water preparation system further includes a second three-way valve and a third three-way valve. The first end of the second three-way valve is connected to the outlet of the second water quality detection device, the second end of the second three-way valve is connected to the inlet of the first flow metering device, and the third end of the second three-way valve is connected to the inlet of the sand filter, the carbon filter, the water softener, the first filter, the first reverse osmosis unit, the sterilizer, or the second filter. The first end of the third three-way valve is connected to the outlet of the third water quality detection device, the second end of the third three-way valve is connected to the inlet of the second flow metering device, and the third end of the third three-way valve is connected to the inlet of the sand filter, the carbon filter, the water softener, the first filter, the first reverse osmosis unit, the sterilizer, the second filter, or the electro-deionization device. The second and third three-way valves are electrically connected to the control module.

8. The laboratory pure water preparation and wastewater recycling system according to claim 7, characterized in that, It also includes a fourth three-way valve, the first end of which is connected to the outlet of the first water quality testing device, the second end of which is connected to the inlet of the purified water storage tank, and the third end of which is connected to the inlet of the wastewater regulating tank, the neutralization tank, the reaction tank, the sedimentation tank, the membrane bioreactor, or the second reverse osmosis host. The fourth three-way valve is electrically connected to the control module.

9. The laboratory pure water preparation and wastewater recycling system according to claim 8, characterized in that, The wastewater recycling system further includes a first stop valve, a second stop valve, a third stop valve, and a fourth stop valve. The first stop valve is connected between the outlet of the third booster pump and the inlet of the neutralization tank. The second stop valve is connected between the outlet of the neutralization tank and the inlet of the reaction tank. The third stop valve is connected between the outlet of the reaction tank and the inlet of the sedimentation tank. The fourth stop valve is connected between the outlet of the sedimentation tank and the inlet of the membrane bioreactor. The first to fourth stop valves are electrically connected to the control module.

10. A laboratory pure water preparation and wastewater recycling system, characterized in that, The system includes the laboratory pure water preparation and wastewater recycling system according to any one of claims 1 to 9, wherein the first water quality testing device is installed in the purified water storage tank to replace the outlet of the wastewater recycling system, and the first water quality testing device and the inlet of the purified water storage tank are connected in sequence.

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