A quality-differentiated water supply system for secondary pump room

Abstract

This invention relates to the field of secondary water supply technology, and discloses a secondary pump station-based differentiated water supply system. The system includes an activated carbon filtration device, an ultrafiltration device, a nanofiltration device, an ultrafiltration water tank, a nanofiltration water tank, a sodium hypochlorite disinfection control device, and an ozone disinfection control device. During water usage, a flow sensor detects the total water consumption and real-time water flow over a period of time, and based on the detection results, either the sodium hypochlorite disinfection control device or the ozone disinfection control device is selected for disinfection. This invention provides a secondary pump station-based differentiated water supply system that introduces ozone or sodium hypochlorite disinfection into the water flow after activated carbon filtration and ultrafiltration. While ensuring that the disinfectant levels in the tap water meet requirements, it maximizes the taste of the drinking water and avoids the problem of microbial regrowth in domestic water pipes and drinking water pipes due to insufficient residual disinfectant after activated carbon filtration, effectively preventing secondary pollution of the water supply.

Description

Technical Field

[0001] The invention relates to the technical field of secondary water supply of tap water, and in particular to a quality-differentiated water supply system for a secondary pump room. Background Art

[0002] With the advancement of urban development, high-rise buildings have emerged on a large scale. It is increasingly difficult for urban water supply networks to meet the water needs of high-rise buildings. Therefore, high-rise buildings must adopt secondary water supply systems. As the "last mile" of the entire water supply process, the secondary water supply system plays a critical role in achieving high-quality drinking water for end users. The quality of secondary water supply is affected by many factors, such as pipe material, water tank material, hydraulic retention time, management level, etc. These factors will cause harmful bacteria, fungi, algae and other organisms to grow, and the water quality is easily polluted. More importantly, many buildings currently have terminal deep treatment processes in the secondary water supply pump room to improve the quality of user water.

[0003] For example, a Chinese invention patent application with publication number CN111395448A discloses a new type of building zoning, pressure division, and quality division water supply process, including a secondary water supply system, a pipe network system, and a water purification system; the water supply steps are as follows: a) the raw water is pre-treated through the secondary water supply system, and the raw water is first disinfected, filtered, and secondary increased before being transported to the domestic water supply pipe through the pipe of the pipe network system; b) a multi-way branch pipe is provided on one side of the domestic water supply pipe, and a control valve is provided on the branch pipe for transporting domestic water to the domestic water pipes of each household user; c) the other end of the domestic water supply pipe is connected to the water purification equipment of the water purification system, and the output end of the water purification equipment is connected to the direct drinking water pipe of the pipe network system, and the direct drinking water pipe is connected to the water distributor, and the direct drinking water is transported to the user's indoor direct drinking faucet through the water distributor.

[0004] Although this invention realizes the supply of domestic water and drinking water in the secondary water supply through separate pipelines, the residual disinfectant has been removed from the raw water after being filtered by activated carbon, so it is easy for microorganisms to grow again in the subsequent pipelines, thus causing secondary pollution. Direct drinking water can be drunk directly by users. In order to ensure safe and reliable water use, it is extremely urgent to set up a "re-disinfection" (secondary disinfection) process in the secondary water supply pump room. Summary of the invention

[0005] The purpose of the present invention is to provide a re-disinfection control process and system for quality-differentiated water supply in a secondary pump room, so as to at least provide a beneficial option or create conditions for solving one or more technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions.

[0007] A secondary pump room quality-differentiated water supply system comprises an activated carbon filter, an ultrafiltration device, a nanofiltration device, an ultrafiltration water tank, a nanofiltration water tank, a sodium hypochlorite disinfection control device, and an ozone disinfection control device. Tap water enters the water inlet of the ultrafiltration device after being filtered by the activated carbon filter. The ultrafiltration device has two water outlets, which are respectively connected to the ultrafiltration water tank and the water inlet of the nanofiltration device. The water outlet of the ultrafiltration water tank is connected to a domestic water pipeline, the water outlet of the nanofiltration device is connected to the nanofiltration water tank, and the water outlet of the nanofiltration water tank is connected to a direct drinking water pipeline. The sodium hypochlorite disinfection control device and the ozone disinfection control device are both connected to the ultrafiltration water tank and the nanofiltration water tank through corresponding control pipelines; a first flow sensor and a second flow sensor are respectively provided on the domestic water pipeline and the direct drinking water pipeline, and a controller is control-connected to the sodium hypochlorite disinfection control device, the ozone disinfection control device, the first flow sensor, and the second flow sensor.

[0008] When using water, the first flow sensor detects and obtains the total domestic water consumption Q for a period of time. S总 And real-time water flow Q for domestic water S The total drinking water consumption Q for a period of time is obtained by detecting the second flow sensor. Z总 And direct drinking water real-time water flow Q Z ; The sodium hypochlorite disinfection control device and the ozone disinfection control device are selected; when the total domestic water consumption Q S总 And real-time water flow Q for domestic water S When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device is selected to provide ozone disinfection for domestic water. When the total domestic water consumption Q S总 And real-time water flow Q for domestic water S When the total amount of direct drinking water Q Z总 And direct drinking water real-time water flow Q Z When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device is selected to provide ozone disinfection for direct drinking water. Z总 And direct drinking water real-time water flow Q Z When both values ​​do not exceed the corresponding set threshold value, the sodium hypochlorite disinfection control device is selected to provide disinfection for direct drinking water.

[0009] Since you can choose ozone disinfection or sodium hypochlorite disinfection according to different water use conditions, the taste of drinking water can be guaranteed to the maximum extent while ensuring that the disinfectant indicators of the water at the tap meet the requirements. This also avoids the problem of microbial regrowth in domestic water pipes and drinking water pipes due to insufficient disinfectant residue after the raw water is filtered through activated carbon, effectively avoiding secondary pollution of the water supply.

[0010] More preferably, a first ultraviolet disinfection device is connected to the water outlet of the ultrafiltration water tank to achieve ultraviolet disinfection of domestic water.

[0011] More preferably, a second ultraviolet disinfection device is connected to the water outlet of the nanofiltration water tank to achieve ultraviolet disinfection of direct drinking water.

[0012] The first ultraviolet disinfection device and the second ultraviolet disinfection device can be commercially available products or can be built by oneself, and their specific structures are common technical knowledge mastered by those skilled in the art. The first ultraviolet disinfection device and the second ultraviolet disinfection device can further ensure the quality of domestic water and direct drinking water, and ensure water safety.

[0013] More preferably, the total domestic water consumption Q S总 , Real-time water flow rate of domestic water Q S , Total drinking water consumption Q Z总 , Direct drinking water real-time water flow Q Z The corresponding set thresholds are all measured through experiments or are empirical values.

[0014] More preferably, when using water, control is also performed during off-peak hours and busy hours. During the off-peak hours, the sodium hypochlorite disinfection control device is used for disinfection. During the busy hours, a sodium hypochlorite disinfection control device or an ozone disinfection control device is selected for disinfection based on the total water consumption and real-time water flow detected over a period of time.

[0015] More preferably, the method for dividing the idle time period and the busy time period is: determine the peak water use period according to the historical curve of water flow change detected by the flow sensor, define the peak water use period as the busy time period, and define the period other than the peak water use period as the idle time period.

[0016] More preferably, the division of the idle time period and the busy time period varies according to different application scenarios of the secondary pump room quality-based water supply system, and the application scenarios include one of a residential area, an office building, a factory area and a hotel.

[0017] More preferably, when the above-mentioned secondary pump room differentiated water supply system is applied to residential areas, the off-peak hours on weekdays are defined as 9:00-17:00 and 0:00-6:00, and the busy hours are defined as 6:00-9:00 and 17:00-24:00; the off-peak hours on holidays are defined as 0:00-6:00, and the busy hours are defined as 6:00-24:00.

[0018] More preferably, when the above-mentioned secondary pump room differentiated water supply system is applied to an office building, the idle time periods on weekdays are defined as 19:00-24:00 and 0:00-7:00, the busy time period is 7:00-19:00, and the idle time period on holidays is defined as 0:00-24:00, that is, the idle time throughout the day.

[0019] More preferably, when the above-mentioned secondary pump room quality-differentiated water supply system is applied to a factory area or a hotel, the busy time period is defined as 0:00-24:00, that is, the busy time of the whole day.

[0020] Since water use is controlled during off-peak hours and busy hours, a sodium hypochlorite disinfection control device is used for disinfection during off-peak hours. During busy hours, a sodium hypochlorite disinfection control device or an ozone disinfection control device is used for disinfection based on the total water consumption and real-time water flow detected over a period of time. While ensuring the taste of drinking water, it can better prevent the regrowth of microorganisms in domestic water pipes and direct drinking water pipes caused by insufficient disinfectant residue.

[0021] The beneficial effects of the present invention will become more clear and explicit in the following embodiments, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic structural diagram of the secondary pump room quality-differentiated water supply system provided by the present invention.

[0023] Description of Figure Numbers.

[0024] 1: activated carbon filtration device, 2: ultrafiltration equipment, 3: nanofiltration equipment, 4: ultrafiltration water tank, 5: nanofiltration water tank, 6: sodium hypochlorite disinfection control device, 7: ozone disinfection control device, 8: first ultraviolet disinfection device, 9: second ultraviolet disinfection device, 10: first flow sensor, 11: second flow sensor, 12: domestic water pipeline, 13: direct drinking water pipeline, 14: controller. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described below in conjunction with the drawings of the specification. The embodiments described below with reference to the drawings are exemplary and intended to explain the present invention, but should not be understood as limiting the present invention.

[0026] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. Example

[0027] Reference Figure 1 As shown, a secondary pump room quality-differentiated water supply system comprises an activated carbon filter device 1, an ultrafiltration device 2, a nanofiltration device 3, an ultrafiltration water tank 4, a nanofiltration water tank 5, a sodium hypochlorite disinfection control device 6, an ozone disinfection control device 7, a first ultraviolet disinfection device 8 and a second ultraviolet disinfection device 9. Tap water enters the water inlet of the ultrafiltration device 2 after being filtered by the activated carbon filter device 1. The ultrafiltration device 2 has two water outlets, which are respectively connected to the water inlets of the ultrafiltration water tank 4 and the nanofiltration device 3. The water outlet of the ultrafiltration water tank 4 is connected to the domestic water pipeline 12 through the first ultraviolet disinfection device 8. The water outlet of the nanofiltration device 3 is connected to the nanofiltration water tank 5. The water outlet of 5 is connected to the direct drinking water pipeline 13 through the second ultraviolet disinfection device 9, and the sodium hypochlorite disinfection control device 6 and the ozone disinfection control device 7 are connected to the ultrafiltration water tank 4 and the nanofiltration water tank 5 through corresponding control pipelines; the first flow sensor 10 and the second flow sensor 11 are respectively provided on the domestic water pipeline 12 and the direct drinking water pipeline 13, and a controller 14 is controlled and connected with the sodium hypochlorite disinfection control device 6, the ozone disinfection control device 7, the first flow sensor 10 and the second flow sensor 11; when using water, the total domestic water consumption Q for a period of time is obtained by detecting through the first flow sensor 10 S总 And real-time water flow Q for domestic water S The second flow sensor 11 detects the total drinking water consumption Q for a period of time. Z总 And direct drinking water real-time water flow Q Z ; The sodium hypochlorite disinfection control device 6 and the ozone disinfection control device 7 are selected; when the total domestic water consumption Q S总 And real-time water flow Q for domestic water S When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device 7 is selected to provide ozone disinfection for domestic water. When the total domestic water consumption Q S总 And real-time water flow Q for domestic water S When the total amount of direct drinking water Q Z总 And direct drinking water real-time water flow Q Z When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device 7 is selected to provide ozone disinfection for direct drinking water. Z总 And direct drinking water real-time water flow Q ZWhen the corresponding set threshold values ​​are not exceeded, the sodium hypochlorite disinfection control device 6 is selected to provide disinfection for direct drinking water.

[0028] It should be noted that the above-mentioned threshold values ​​can be determined through experiments, and the specific determination methods are common technical knowledge mastered by those skilled in the art and will not be described in detail here.

[0029] Compared with the prior art, the present embodiment provides a secondary pump room quality-differentiated water supply system, which introduces ozone disinfection or sodium hypochlorite disinfection into the water flow after being filtered through activated carbon and ultrafiltration membrane. When using water, ozone disinfection or sodium hypochlorite disinfection can be selected independently according to different water use conditions. While ensuring that the disinfectant index of the tap water meets the requirements, the taste of direct drinking water is guaranteed to the greatest extent. At the same time, it also avoids the problem of microbial regrowth in domestic water pipes and direct drinking water pipes due to insufficient disinfectant residue after the raw water is filtered through activated carbon, thereby effectively avoiding secondary pollution of the water supply.

[0030] In some embodiments, at least one of the first ultraviolet disinfection device 8 and the second ultraviolet disinfection device 9 can be omitted. When at least one of the first ultraviolet disinfection device 8 and the second ultraviolet disinfection device 9 is omitted, its corresponding terminal disinfection function is lost, and the water safety will be reduced.

[0031] In some embodiments, according to different water use conditions, the secondary pump room quality-differentiated water supply system also performs control during off-peak hours and busy hours. During off-peak hours, the sodium hypochlorite disinfection control device 6 is used for disinfection. During busy hours, the sodium hypochlorite disinfection control device 6 and the ozone disinfection control device 7 are selected for disinfection based on the total water consumption and real-time water flow detected over a period of time.

[0032] Specifically, according to different application scenarios of the secondary pump room differentiated water supply system, the division of the off-peak time period and the busy time period is also different. For example, when the above-mentioned secondary pump room differentiated water supply system is applied to a residential area, the off-peak time period on weekdays is defined as 9:00-17:00 and 0:00-6:00, and the busy time period is defined as 6:00-9:00 and 17:00-24:00. The off-peak time period on holidays is defined as 0:00-6:00, and the busy time period is defined as 6:00-24:00.

[0033] When the above-mentioned secondary pump room differentiated water supply system is applied to an office building, the idle time periods on weekdays are defined as 19:00-24:00 and 0:00-7:00, the busy time period is 7:00-19:00, and the idle time period on holidays is defined as 0:00-24:00, that is, the idle time throughout the day.

[0034] When the above-mentioned secondary pump room differentiated water supply system is applied to factories or hotels, the busy time period is defined as 0:00-24:00, that is, the busy time of the whole day.

[0035] Obviously, those skilled in the art may also adopt other methods of dividing idle time periods and busy time periods according to different actual needs. In some embodiments, the peak water use period can be determined based on the historical curve of water flow changes detected by the flow sensor, and the peak water use period can be defined as the busy time period, and the time period outside the peak water use period can be positioned as the idle time period, which is not limited to this embodiment.

[0036] In order to better reflect the progressiveness of the present invention, several specific operation tests are used to provide a verification description below.

[0037] Run Trial 1.

[0038] Operation site: A water company factory on Xingye 2nd Road, Chancheng District, Foshan City. The defined busy time period is 0:00-24:00.

[0039] Tap water quality (before the secondary water supply at this location was treated): chromaticity <5 degrees; turbidity 0.31 NTU; odor and taste: 0, none; visible matter: none; pH value: 7.65; total hardness (as CaCO3): 46.7 mg / L; total bacterial count: 10 CFU / mL; total Escherichia coli: not detected; fecal coliforms: not detected; free chlorine: 0.46 mg / L.

[0040] Water quality of direct drinking tap water: chromaticity <5 degrees; turbidity 0.16NTU; odor and taste: 0, none; visible matter: none; pH value: 7.77; total hardness (measured in CaCO3): 21.8 mg / L; total bacteria count: not detected; total Escherichia coli: not detected; fecal coliforms: not detected; ozone: 0.1 mg / L; bromate: <0.005 mg / L.

[0041] Water quality of domestic tap water: chromaticity <5 degrees; turbidity: 0.19NTU; odor and taste: 0, none; visible matter: none; pH value: 7.68; total hardness (measured in CaCO3): 42.5 mg / L; total bacteria count: not detected; total Escherichia coli: not detected; fecal coliforms: not detected; ozone: 0.13 mg / L; bromate: <0.005 mg / L.

[0042] Specific detection method: "Standard Test Method for Drinking Water" (GB / T 5750.6-2023).

[0043] Conclusion: From the operation test 1, when the present invention is applied in the factory scene, the ozone residual in the tap water is about 0.1 mg / L, and the disinfectant residual meets the "National Drinking Water Quality Standard (GB5749-2022)". The water quality tastes good and can inhibit the regrowth of microorganisms in the pipeline.

[0044] Run trial 2.

[0045] Operation site: A residential area in Chancheng District, Foshan City. The busy hours on weekdays are defined as 6:00-9:00 and 17:00-24:00, and the busy hours on holidays are defined as 6:00-24:00.

[0046] Tap water quality (before the secondary water supply treatment at this location): (at 10:30) turbidity: 0.24 NTU; pH: 7.63; free chlorine: 0.20 mg / L. (at 20:30) turbidity: 0.22 NTU; pH: 7.66; free chlorine: 0.33 mg / L.

[0047] Drinking tap water quality: (at 10:30 on weekdays) turbidity: 0.14 NTU; pH: 7.70; free chlorine: 0.32 mg / L. (at 20:30 on weekdays) turbidity: 0.12 NTU; pH: 7.78; ozone: 0.12 mg / L.

[0048] Domestic tap water quality: (at 10:30 on working days) turbidity: 0.19 NTU; pH: 7.65; free chlorine: 0.29 mg / L. (at 20:30 on working days) turbidity: 0.16 NTU; pH: 7.72; ozone: 0.15 mg / L.

[0049] Specific detection methods: imported online turbidity meter (laser scattering method), imported online pH meter (electrode method), imported online disinfectant residual meter (electrode method).

[0050] Conclusion: From the operation test 2, when the present invention is applied in a residential area, the ozone residual in the tap water is about 0.15 mg / L, the free chlorine is about 0.30 mg / L, and the disinfectant residual meets the "National Drinking Water Quality Standard (GB5749-2022)". The water quality tastes good and can inhibit the regrowth of microorganisms in the pipeline.

[0051] Run trial 3.

[0052] Operation site: an office building in Chancheng District, Foshan City. The busy time on weekdays is defined as 7:00-19:00, and the off-peak time on holidays is defined as 0:00-24:00.

[0053] Tap water quality (before the secondary water supply treatment at this location): (at 11:30 on working days) turbidity: 0.23 NTU; pH: 7.66; free chlorine: 0.13 mg / L. (at 21:30 on working days) turbidity: 0.25 NTU; pH: 7.68; free chlorine: 0.11 mg / L.

[0054] Drinking tap water quality: (at 11:30 on weekdays) turbidity: 0.15 NTU; pH: 7.73; ozone: 0.14 mg / L. (at 21:30 on weekdays) turbidity: 0.17 NTU; pH: 7.71; free chlorine: 0.25 mg / L.

[0055] Domestic tap water quality: (at 11:30 on weekdays) turbidity: 0.18 NTU; pH: 7.74; ozone: 0.18 mg / L. (at 21:30 on weekdays) turbidity: 0.15 NTU; pH: 7.70; free chlorine: 0.29 mg / L.

[0056] Specific detection methods: imported online turbidity meter (laser scattering method), imported online pH meter (electrode method), imported online disinfectant residual meter (electrode method).

[0057] Conclusion: From operation test 3, when the present invention is applied in an office building scenario, the ozone residual in the tap water is about 0.15 mg / L, the free chlorine is about 0.25 mg / L, and the disinfectant residual meets the "National Drinking Water Quality Standard (GB5749-2022)". The water tastes good and can inhibit the regrowth of microorganisms in the pipeline.

Claims

1. A secondary pump room quality-based water supply system, characterized in that: It comprises an activated carbon filter device, an ultrafiltration device, a nanofiltration device, an ultrafiltration water tank, a nanofiltration water tank, a sodium hypochlorite disinfection control device, and an ozone disinfection control device. After being filtered by the activated carbon filter device, tap water enters the water inlet of the ultrafiltration device. The ultrafiltration device has two water outlets, which are respectively connected to the ultrafiltration water tank and the water inlet of the nanofiltration device. The water outlet of the ultrafiltration water tank is connected to a domestic water pipeline, the water outlet of the nanofiltration device is connected to the nanofiltration water tank, and the water outlet of the nanofiltration water tank is connected to a direct drinking water pipeline. The sodium hypochlorite disinfection control device and the ozone disinfection control device are both connected to the ultrafiltration water tank and the nanofiltration water tank through corresponding control pipelines; a first flow sensor and a second flow sensor are respectively provided on the domestic water pipeline and the direct drinking water pipeline, and a controller is controlled and connected with the sodium hypochlorite disinfection control device, the ozone disinfection control device, the first flow sensor, and the second flow sensor; When using water, the first flow sensor detects and obtains the total domestic water consumption Q for a period of time. S总 And real-time water flow Q for domestic water S The total drinking water consumption Q for a period of time is obtained by detecting the second flow sensor. Z总 And direct drinking water real-time water flow Q Z ; Either the sodium hypochlorite disinfection control device or the ozone disinfection control device is selected; When the total domestic water consumption is Q S总 And real-time water flow Q for domestic water S When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device is selected to provide ozone disinfection for domestic water. When the total domestic water consumption Q S总 And real-time water flow Q for domestic water S When the total amount of direct drinking water Q Z总 And direct drinking water real-time water flow Q Z When at least one of the above exceeds the corresponding set threshold, the ozone disinfection control device is selected to provide ozone disinfection for direct drinking water. Z总 And direct drinking water real-time water flow Q Z When both values ​​do not exceed the corresponding set threshold value, the sodium hypochlorite disinfection control device is selected to provide disinfection for direct drinking water.

2. A secondary pump room quality-based water supply system according to claim 1, characterized in that: A first ultraviolet disinfection device is connected to the water outlet of the ultrafiltration water tank to achieve ultraviolet disinfection of domestic water.

3. A secondary pump room quality-based water supply system according to claim 1, characterized in that: A second ultraviolet disinfection device is connected to the water outlet of the nanofiltration water tank to achieve ultraviolet disinfection of direct drinking water.

4. A secondary pump room quality-based water supply system according to claim 1, characterized in that: Total domestic water consumption Q S总 , Real-time water flow rate of domestic water Q S , Total drinking water consumption Q Z总 , Direct drinking water real-time water flow Q Z The corresponding set thresholds are all measured through experiments or are empirical values.

5. A secondary pump room quality-based water supply system according to claim 1, characterized in that: When using water, control is also performed during off-peak hours and busy hours. During off-peak hours, the sodium hypochlorite disinfection control device is used for disinfection. During busy hours, a sodium hypochlorite disinfection control device or an ozone disinfection control device is selected for disinfection based on the total water consumption and real-time water flow detected over a period of time.

6. A secondary pump room quality-based water supply system according to claim 5, characterized in that: The method for dividing the idle time period and the busy time period is as follows: the peak water use period is determined according to the water flow change history curve detected by the flow sensor, the peak water use period is defined as the busy time period, and the period other than the peak water use period is positioned as the idle time period.

7. A secondary pump room quality-based water supply system according to claim 5, characterized in that: The division of the idle time period and the busy time period varies according to different application scenarios of the secondary pump room quality-based water supply system, and the application scenarios include one of a residential area, an office building, a factory area, and a hotel.

8. A secondary pump room quality-based water supply system according to claim 5, characterized in that: When the above-mentioned secondary pump room differentiated water supply system is applied to residential areas, the busy hours on weekdays are defined as 6:00-9:00 and 17:00-24:00, and the busy hours on holidays are defined as 6:00-24:

00.

9. A secondary pump room quality-based water supply system according to claim 5, characterized in that: When the above-mentioned secondary pump room differentiated water supply system is applied to an office building, the busy time period on weekdays is defined as 7:00-19:00, and the idle time period on holidays is defined as the whole day.

10. A secondary pump room quality-based water supply system according to claim 5, characterized in that: When the above-mentioned secondary pump room differentiated water supply system is applied to factories or hotels, the busy hour period is defined as the whole day.

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