Municipal pipe network water supply simulation and water quality safety evaluation device

Abstract

The utility model discloses a device for water supply simulation and water quality safety evaluation of a municipal pipe network. The device comprises a raw water tank, a raw water inlet pump, an ultrafiltration membrane assembly, a pressure sensor, a medicament tank, a dosing pump, a stirrer, a disinfection tank, a pipeline water inlet pump, a pipeline reactor, a flowmeter and a pipeline water outlet tank, the raw water tank is connected with the ultrafiltration membrane assembly through a raw water inlet pump, the ultrafiltration membrane assembly is connected with the disinfection tank, and the medicament tank is connected with the disinfection tank through a pipeline and a dosing pump; the disinfection tank is provided with a water outlet which is connected with a water inlet pump through a pipeline, and the water inlet pump is connected with a pressure gauge; the pressure gauge is connected with the pipeline reactor through a pipeline; an outlet of the pipeline reactor is sequentially connected with the flowmeter and the pipeline water outlet pool; by arranging a water supply pipeline simulating a municipal pipe network, a good removal effect on soluble organic pollutants in settled water is achieved through ultrafiltration-low-dose disinfection; meanwhile, the municipal pipe network can be simulated, and fluctuation of municipal water supply can be avoided.

Description

Technical Field

[0001] This invention relates to the field of water supply treatment technology, and in particular to a device for simulating municipal water supply network and evaluating its water quality safety. Background Technology

[0002] Currently, conventional water treatment processes (coagulation-sedimentation-filtration-disinfection) are effective at removing common water quality issues such as turbidity, particulate matter, colloids, and bacteria, but their effectiveness is poor for dissolved organic matter, ammonia nitrogen, algae, and parasites. Ultrafiltration membrane treatment is a green and harmless physical separation technology. Water treated by this process exhibits significantly reduced disinfection byproducts, thus improving the chemical safety of drinking water. Traditional processes, with their high dosages of disinfectants, produce higher levels of disinfection byproducts, and the levels of residual chlorine, chlorate, and chloroform in the pipelines are unclear. Therefore, this novel approach, while treating the settled water with an ultrafiltration membrane module, adds a low dose of sodium hypochlorite disinfectant to the pipeline. Based on this, a municipal water supply simulation and water quality safety assessment are conducted. Raw water enters the ultrafiltration membrane module under the action of an inlet pump. The ultrafiltered water then enters the disinfection tank where it is thoroughly mixed with the disinfectant by a stirrer, resulting in improved water quality.

[0003] Currently, there is a lack of experimental devices for simulating municipal water supply networks in the existing technology. Therefore, it is difficult to simulate water supply conditions in advance during water supply tests, which may lead to unstable water supply in the water supply network. Furthermore, it is difficult to evaluate the water quality of municipal water supply networks in advance and to predict fluctuations in the water quality of municipal water supply networks. Therefore, this application aims to provide a device for simulating municipal water supply networks and evaluating their water quality safety.

[0004] A typical prior art CN215669872U discloses a constant pressure water supply system for coal mines; however, this type of water supply system cannot simulate municipal water supply networks and cannot evaluate water quality safety.

[0005] For example, prior art CN105841922A discloses a drainage network simulation system and simulation method for laboratory use; however, it cannot simulate water supply to municipal pipe networks or evaluate water quality safety.

[0006] Based on the above problems, the applicant proposes a municipal water supply simulation and water quality safety evaluation device, aiming to solve the problem that existing technologies lack simulation and water quality safety evaluation capabilities for municipal water supply. Utility Model Content

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A device for simulating municipal water supply and evaluating its water quality safety includes a raw water tank, a raw water inlet pump, an ultrafiltration membrane module, a pressure sensor, a reagent tank, a dosing pump, a stirrer, a disinfection tank, a pipeline inlet pump, a pipeline reactor, a flow meter, and a pipeline outlet tank. The raw water tank is connected to the ultrafiltration membrane module via the raw water inlet pump, the ultrafiltration membrane module is connected to the disinfection tank, and the reagent tank is connected to the disinfection tank via a pipeline and a dosing pump. The disinfection tank has an outlet, which is connected to the inlet pump via a pipeline, and the inlet pump is connected to a pressure gauge. The pressure gauge is connected to the pipeline reactor via a pipeline, and the outlet of the pipeline reactor is sequentially connected to the flow meter and the pipeline outlet tank.

[0009] Furthermore, the ultrafiltration membrane module includes a hollow fiber membrane raw water inlet and a pipeline outlet; the hollow fiber membrane raw water inlet is connected to a raw water inlet pump via a pipeline, and the pipeline outlet is connected to a disinfection tank via a pipeline.

[0010] Furthermore, a pressure sensor is installed on the pipe connecting the outlet of the ultrafiltration membrane module and the disinfection tank. The pressure sensor is electrically connected to a computer and is configured to monitor the transmembrane pressure difference in real time.

[0011] Furthermore, the disinfection pool is connected to the outlet of the dosing pump via a pipe, and the inlet of the dosing pump is connected to the reagent pool via a pipe.

[0012] Furthermore, the ultrafiltration membrane assembly is configured to be at least two sets in parallel.

[0013] Furthermore, the outlet of the disinfection pool is connected to a pipeline inlet pump via a pipeline, and the pipeline inlet pump is connected to multiple pressure gauges in parallel. Each pressure gauge is connected to a pipeline reactor. The pipeline reactor enters the pipeline outlet pool after passing through a pipeline connected to a flow meter. The pipeline reactor has a conventional water pipe structure. During the water distribution process, the water quality changes in the pipeline, hence the pipeline at this location is called a pipeline reactor.

[0014] Furthermore, the pipeline reactor is provided with several movable joints, each of which is sequentially fitted with circular gaskets made of steel, cement, and ductile iron.

[0015] Furthermore, the ultrafiltration membrane module uses a PVDF hollow fiber membrane.

[0016] Furthermore, the agitator is a paddle agitator or an air-blowing agitator.

[0017] Furthermore, the disinfection pool has a black light-proof cover, which can stably ensure the effective chlorine content inside.

[0018] The working process of this utility model is as follows:

[0019] After pretreatment and sedimentation, the water is stored in the raw water tank. Under the delivery of the raw water inlet pump, the sedimented water flows from the raw water tank into the ultrafiltration membrane module. During this process, the water quality is improved by contact between the sedimented water and the ultrafiltration membrane module. Then the water flows to the disinfection tank for disinfection.

[0020] Under the action of the inlet pump, water in the disinfection tank enters the inside of the pipe, flows through the pipe reactor, and is successively fitted with circular gaskets made of steel, cement and ductile iron in the pipe reactor. Finally, the water flows from the outlet pipe into the outlet pool.

[0021] The process of membrane filtration treatment of settled water by the device for simulating municipal water supply and evaluating water quality safety is as follows:

[0022] After settling, the water enters the ultrafiltration membrane module from the raw water tank under the action of the raw water inlet pump. The self-made ultrafiltration membrane module uses PVDF hollow fiber membrane.

[0023] The water then flows upwards, and the hollow fiber membrane is placed vertically in the device. Under the pressure of the raw water inlet pump, the water enters the ultrafiltration membrane module and flows to the disinfection tank through the outlet pipe of the ultrafiltration membrane module.

[0024] Furthermore, a pressure sensor is installed at the inlet pipe of the ultrafiltration membrane module and connected to a computer. The transmembrane pressure difference data collected by the computer is used to determine the membrane fouling status of the ultrafiltration membrane module, and a certain pressure difference threshold is set for cleaning, as well as regular chemical cleaning.

[0025] The process of low-dose disinfection of raw water by the device for simulating municipal water supply and evaluating water quality safety is as follows:

[0026] During low-dose disinfection, raw water flows into the disinfection tank from the outlet pipe of the ultrafiltration membrane module. Disinfectant from the reagent tank flows into the disinfection tank via a dosing pump, while a stirrer simultaneously agitates the water. The residence time in the disinfection tank is ensured to be 10-50 minutes, preferably 30 minutes, increasing the contact oxidation time between the disinfectant and the raw water. This improves the disinfection effect and consequently, the quality of the effluent.

[0027] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model compared to the prior art are as follows:

[0028] This invention provides a device for simulating municipal water supply and evaluating water quality safety, treating settled water. It utilizes ultrafiltration-low-dose disinfection to effectively remove dissolved organic pollutants from the settled water. The device and method purify the raw water using an ultrafiltration membrane module, ensuring that all indicators of the effluent meet drinking water standards. The device and method reduce the amount of disinfectant used, effectively slowing the formation of disinfection byproducts. During operation, the device integrates a pressure sensor and a computer, enabling real-time monitoring of transmembrane pressure differences and achieving automated management.

[0029] This novel technology can simulate the water supply pipelines and processes of a municipal water supply network. By adding an ultrafiltration membrane module coupled with a low-dose disinfectant, it can simulate the effect of this method on water quality safety and avoid fluctuations in the water quality of the municipal water supply network.

[0030] In the simulation, the effective chlorine concentration in the disinfection tank was maintained at 2.0 mg / L. The device's energy efficiency ensured the biological safety of the effluent during the municipal water supply simulation and water quality safety evaluation. It met national standards for residual chlorine concentration during a 40-hour pipe retention time, and the content of disinfection byproducts did not exceed the limit of 0.7 mg / L. The treated effluent can be used in drinking water facilities, demonstrating practical significance. The ultrafiltration membrane module was cleaned every five days for 5 minutes. During the experiment, the transmembrane pressure difference remained stable at approximately 22 kPa. After maintenance cleaning, the transmembrane pressure difference decreased significantly with minimal fluctuation. The dosing pump operated stably to maintain the effective chlorine concentration in the disinfection tank. Attached Figure Description

[0031] Figure 1 A schematic diagram of a device system for simulating municipal water supply network and evaluating water quality safety;

[0032] Figure 2 Schematic diagram of an ultrafiltration reactor;

[0033] Figure 3 A schematic diagram of the disinfection process in a disinfection tank reactor.

[0034] In the diagram: 1. Raw water tank; 2. Raw water inlet pump; 3. Ultrafiltration membrane module; 4. Pressure sensor; 5. Computer; 6. Chemical tank; 7. Dosing pump; 8. Agitator; 9. Disinfection tank; 10. Pipeline inlet pump; 11. Pressure gauge; 12. Pipeline reactor; 13. Flow meter; 14. Pipeline outlet tank; 301. Hollow fiber membrane; 302. Raw water inlet; 303. Pipeline outlet. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to embodiments:

[0036] Example 1

[0037] Combination Figure 1 This embodiment is described as follows:

[0038] A device for simulating municipal water supply and evaluating its water quality safety includes a raw water tank 1, a raw water inlet pump 2, an ultrafiltration membrane module 3, a pressure sensor 4, a computer 5, a reagent tank 6, a dosing pump 7, a stirrer 8, a disinfection tank 9, a pipeline inlet pump 10, a pressure gauge 11, a pipeline reactor 12, a flow meter 13, and a pipeline outlet tank 14.

[0039] After settling, the water is stored in the raw water tank 1. Under the delivery of the raw water inlet pump 2, the raw water flows into the ultrafiltration membrane module 3. During this process, the raw water comes into contact with the hollow fiber membrane 301 of the ultrafiltration membrane module 3. Afterward, the water in the ultrafiltration membrane module 3 enters the disinfection tank 9, and under the action of the pipeline inlet pump 10, flows into the pressure gauge 11, the pipeline reactor 12, and finally flows into the pipeline outlet tank 14.

[0040] Example 2

[0041] Combination Figure 1-2 This embodiment is described as follows:

[0042] Compared with Example 1, the ultrafiltration membrane assembly of this example is configured as follows: the ultrafiltration membrane assembly 3 includes a hollow fiber membrane 301, a raw water inlet 302, and a pipeline outlet 303.

[0043] Raw water flows into the ultrafiltration membrane module 3 from the raw water inlet 302 under the action of the raw water inlet pump 2. The hollow fiber membrane 301 is placed vertically in the module, and the water flows upward evenly. During this process, the hollow fiber membrane 301 contacts the raw water and adsorbs organic matter. The raw water in the ultrafiltration membrane module 3 flows out through the pipe outlet 303 and then flows to the pressure sensor 4. The pressure sensor is electrically connected to the computer 5 through relevant wires, and the computer collects the transmembrane pressure difference parameters monitored by the pressure sensor. At the same time, the ultrafiltration membrane module 3 is also equipped with an adjustable cross-flow valve, which allows the raw water to flow back to the raw water tank 1.

[0044] Example 3

[0045] Combination Figure 1-3 This embodiment is described as follows:

[0046] Compared to Example 2, this example also includes a disinfection tank 9. During disinfection, the dosing pump 7 maintains a stable rotation speed, and the disinfectant in the reagent tank 6 enters the disinfection tank 9 through the dosing pump 7. Simultaneously, water from the ultrafiltration membrane module 3 flows into the disinfection tank 9 via the pressure sensor 4. The disinfection tank 9 is equipped with a black light-proof cover to stably maintain the effective chlorine content inside. Meanwhile, the operation of the agitator 8 ensures uniform mixing inside the disinfection tank 9. The agitator 8 is a paddle-type agitator; continuous stirring by the agitator 8 increases the contact area of ​​the disinfectant, thereby improving the quality of the effluent.

[0047] The working process of this novel invention is as follows:

[0048] The settled water is stored in the raw water tank 1. Under the pumping of the raw water inlet pump 2, the settled water flows from the raw water tank 1 into the ultrafiltration membrane module 3. During this process, the settled water comes into contact with the ultrafiltration membrane module 3, improving the water quality. The water then flows to the disinfection tank 9 for disinfection. Under the action of the pipeline inlet pump 10, the water in the disinfection tank 9 enters the pipeline and flows through the pipeline reactor 12. The pipeline reactor 12 has circular gaskets made of steel, cement, and ductile iron installed sequentially in its hinge. Finally, the water flows from the outlet pipe into the pipeline outlet tank 14.

[0049] After settling, the water enters the ultrafiltration membrane module 3 from the raw water tank 1 under the action of the raw water inlet pump 2. The ultrafiltration membrane module 3 uses a PVDF hollow fiber membrane 301. The water flows upward, and the hollow fiber membrane 301 is placed vertically in the device. Under the pressure of the raw water inlet pump 2, the water enters the ultrafiltration membrane module 3 and flows to the disinfection tank through the outlet pipe 303 of the ultrafiltration membrane module 3.

[0050] A pressure sensor 4 is installed at the inlet pipe of the ultrafiltration membrane module and connected to a computer 5. The fouling status of the ultrafiltration membrane module 3 is determined by the transmembrane pressure difference data collected by the computer 5, and chemical cleaning is performed regularly.

[0051] During low-dose disinfection, raw water flows into the disinfection tank 9 from the outlet pipe 303 of the ultrafiltration membrane module 3. Disinfectant from the reagent tank 6 flows into the disinfection tank 9 via the dosing pump 7, while the agitator 8 simultaneously stirs the water within the disinfection tank 9. The residence time in the disinfection tank 9 is ensured to be no less than 30 minutes, and the agitator 8 increases the contact oxidation time between the disinfectant and the raw water. This improves the disinfection effect and consequently, the quality of the effluent.

[0052] Obviously, the above embodiments of this invention are merely examples for clearly illustrating the invention, and are not intended to limit the implementation of the invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection claimed by this invention.

Claims

1. A device for simulating municipal water supply networks and evaluating their water quality safety, characterized in that: It includes a raw water tank, a raw water inlet pump, an ultrafiltration membrane module, a pressure sensor, a chemical tank, a dosing pump, a stirrer, a disinfection tank, a pipeline inlet pump, a pipeline reactor, a flow meter, and a pipeline outlet tank; The raw water tank is connected to the ultrafiltration membrane module via a raw water inlet pump. The ultrafiltration membrane module is connected to the disinfection tank. The chemical tank is connected to the disinfection tank via pipes and a dosing pump. The disinfection tank is equipped with an outlet, which is connected to an inlet pump via a pipe. The inlet pump is connected to a pressure gauge. The pressure gauge is connected to a pipeline reactor via a pipe. The outlet of the pipeline reactor is connected to a flow meter and a pipeline outlet tank in sequence.

2. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The ultrafiltration membrane module includes a hollow fiber membrane raw water inlet and a pipeline outlet; the hollow fiber membrane raw water inlet is connected to a raw water inlet pump via a pipeline, and the pipeline outlet is connected to a disinfection tank via a pipeline.

3. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 2, characterized in that: A pressure sensor is installed on the pipe connecting the outlet of the ultrafiltration membrane module and the disinfection tank. The pressure sensor is electrically connected to a computer and is configured to monitor the transmembrane pressure difference in real time.

4. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The disinfection tank is connected to the outlet of the dosing pump via a pipe, and the inlet of the dosing pump is connected to the reagent tank via a pipe.

5. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 2, characterized in that: The ultrafiltration membrane assembly is configured to be at least two sets in parallel.

6. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The outlet of the disinfection pool is connected to a pipeline inlet pump via a pipeline. The pipeline inlet pump is connected to multiple pressure gauges in parallel, and each pressure gauge is connected to a pipeline reactor. The pipeline reactor enters the pipeline outlet pool after passing through a pipeline connected to a flow meter.

7. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The conduit reactor is fitted with circular gaskets made of steel, cement, and ductile iron in sequence.

8. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The ultrafiltration membrane module uses a PVDF hollow fiber membrane.

9. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The agitator is either a paddle agitator or an air-blowing agitator.

10. The device for simulating municipal water supply network and evaluating its water quality safety according to claim 1, characterized in that: The disinfection pool is equipped with a black light-proof cover, which can stably ensure the effective chlorine content inside.

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