A water treatment system

Abstract

This invention discloses a water treatment system, including a system inlet, a water storage container I, a system outlet, and an ultraviolet sterilizer. The treated water flows sequentially through a first activated carbon filter, a second activated carbon filter, a particulate filter, and a membrane device, and is stored in the water storage container I. The ultraviolet sterilizer is located downstream of the system outlet. The water treatment system also includes an ozone subsystem, a recirculation subsystem, and a main programmable logic controller (PLC). The ozone subsystem includes an ozone generator for generating ozone and at least one contact along the flow path for introducing ozone into the process water. The recirculation subsystem operates periodically to extract treated water from the water storage container I to form circulating water, which is then introduced into a water supply pipeline upstream of the ultraviolet sterilizer. The main PLC controls the flow rate of process water through the water treatment system, the ozone production, and the intensity of ultraviolet irradiation, and also controls the recirculation subsystem.

Description

Technical Field

[0001] This invention relates to water treatment, and more specifically to a water treatment system. Background Technology

[0002] Municipal drinking water supplies typically undergo some form of treatment to disinfect the water obtained from the final source. Depending on the efficiency of the disinfection system and whether additional water treatment is performed at the municipal level, municipal drinking water supplies may still have unacceptable tastes and odors and may contain potentially unhealthy disinfection byproducts (DBPs). For example, chlorine is a typical disinfectant used by municipalities, and byproducts of water chlorination include trihalomethanes (THMs) and other chlorinated compounds, all of which have been linked to carcinogenicity and other diseases in humans.

[0003] To mitigate the aforementioned potential problems with municipal water supply, buildings are equipped with inlet point water treatment systems to deeply treat municipal water, improving taste, reducing odor, and removing unwanted disinfection byproducts generated when municipal water enters the building's water supply system. Inlet point treatment systems typically employ one of two methods: ozone combined with biological activated carbon; or membrane separation.

[0004] Currently, the combination of ozonation and biological activated carbon technology has achieved good results in drinking water treatment, and most inlet water treatment systems adopt this technology. In the ozonation-biological activated carbon process, the water is first oxidized with ozone, and then passed through a layer of biological activated carbon. Organic compounds and other substances in the water are adsorbed onto the surface of the activated carbon, and microorganisms living in the biofilm on the activated carbon surface further process these organic compounds and other substances. However, the adsorption on the activated carbon generally disappears after two months, so the activated carbon needs to be replaced frequently. Furthermore, backwashing and bioleaking of the activated carbon can lead to the reintroduction of organic compounds and other substances, and the introduction of microorganisms into the drinking water source.

[0005] Membrane separation technology utilizes mechanical filtration, typically driven by pressure, to separate impurities from water. Membrane separation includes microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO). However, membrane filtration is a source of secondary pollution, has low water utilization, and the lowest primary recovery rate is only 15%. Furthermore, prolonged consumption of purified water can have adverse effects on human health.

[0006] Currently, there is no comprehensive and effective portable drinking water inlet treatment system to overcome the problems of water waste and adverse health effects of existing technologies. Summary of the Invention

[0007] To overcome a series of defects in the existing technology, the present invention aims to provide a water treatment system, including a system inlet 2, a water storage container I 25, a system outlet 36, and an ultraviolet sterilizer 21. The system inlet 2 is fluidly connected to the source water to be treated and flows the treated water into the water treatment system 100. The system inlet 2 is fluidly connected to multiple water pipelines for transporting the treated water along the pipelines. The treated water flows sequentially through a first activated carbon filter 15, a second activated carbon filter 17 downstream of the first activated carbon filter 15, a particulate filter 19 downstream of the second activated carbon filter 17, and a membrane device downstream of the particulate filter 19. The water storage container I 25 is located at the end of the flow path and is used to store the treated water generated by the system. The system outlet 36 is fluidly connected to the water storage container I 25 and is used to transport the treated water to a location outside the water treatment system 100. The ultraviolet sterilizer 21 is located downstream of the system outlet 36.

[0008] The water treatment system 100 also includes an ozone subsystem, a recirculation subsystem, and a main programmable logic controller 90.

[0009] The ozone subsystem includes an ozone generator 43 for generating ozone, and at least one contact along the flow path for introducing ozone into the process water.

[0010] The recirculation subsystem operates periodically to draw treated water from the water storage container I 25 to form circulating water, introduce the circulating water into the water supply line upstream of the ultraviolet sterilizer 21, and return the circulating water to the water storage container I 25.

[0011] The main programmable logic controller 90 is used to control the flow rate of process water through the water treatment system, the ozone production, and the intensity of ultraviolet irradiation, and to control the circulation subsystem.

[0012] Preferably, the ozone subsystem extracts treated water from the water storage container and adds ozone to form ozone water. The ozone subsystem introduces the ozone water into the treated water through a first branch water pipeline 54, a second branch water pipeline 55, and a third branch water pipeline 56. The first branch water pipeline 54 is downstream of the second activated carbon filter 17, the second branch water pipeline 55 is between the first activated carbon filter 15 and the second activated carbon filter 17, and the third branch water pipeline 56 is upstream of the first activated carbon filter 15. A first water jet injector 45 and a first ultraviolet device 57 are installed in the first branch water pipeline 54. The second branch water pipeline 55 is equipped with a second water jet injector 46 and a second ultraviolet device 58, and the third branch water pipeline 56 is equipped with a third water jet injector 47 and a third ultraviolet device 59. The first water jet injector 45, the second water jet injector 46, and the third water jet injector 47 are used to introduce ozone into the treated water and form ozone water in the first branch water pipeline 54, the second branch water pipeline 55, and the third branch water pipeline 56, respectively. The first ultraviolet device 57, the second ultraviolet device 58, and the third ultraviolet device 59 are located downstream of the first water jet injector 45, the second water jet injector 46, and the third water jet injector 47, respectively.

[0013] Preferably, the ozone concentration in the treated water is 0.05ppm-2ppm.

[0014] Preferably, the water treatment system 100 further includes an online multi-parameter water quality analyzer 31 for measuring at least one water quality parameter of the process water; the online multi-parameter water quality analyzer 31 is in electronic communication with the main programmable logic controller 90; the main programmable logic controller 90 is programmed to compare at least one water quality parameter measured by at least one sensor with an index value of at least one water quality parameter, and to operate the water treatment system 100 based on the comparison.

[0015] Preferably, the water quality parameters include one or more of residual chlorine, total chlorine, pH, total organic carbon, total dissolved solids, conductivity, and temperature.

[0016] Preferably, the main programmable logic controller 90 includes an ozonation controller 91 or communicates with an ozonation controller 91, the ozonation controller 91 controlling the amount of ozone in the treated water based on a comparison with an ozone concentration index value; the water treatment system 100 further includes an online ozone detector 32, the online ozone detector 32 detecting the ozone concentration, and the ozonation controller 91 controlling the amount of ozone introduced into the process water based on the ozone concentration.

[0017] Preferably, the recirculation subsystem operates automatically on a periodic time basis, and the ultraviolet sterilizer 21 operates together with the recirculation subsystem when it is running.

[0018] Preferably, the water storage container I 25 is a variable volume container, which is provided with a first predetermined water level and a second predetermined water level, and includes at least one water level sensor 4. When the water level in the water storage container I 25 reaches or exceeds the first predetermined water level, the water level sensor 4 sends a signal to notify the process water to enter the system to shut off and sends a signal. When the water level in the container is at or below the second predetermined water level, the process water entering the system is opened. The water treatment system 100 also includes a water storage container II 5, which is the same as the water storage container I 25. The water storage container II 5 is located between the system inlet 2 and the first activated carbon filter 15.

[0019] Preferably, the first activated carbon filter 15 and the second activated carbon filter 17 include at least coal-based activated carbon and bamboo-based activated carbon, wherein composite materials such as zeolite or resin are optionally added.

[0020] Preferably, the membrane device is a ceramic ultrafiltration membrane device, but is not limited to a ceramic ultrafiltration membrane device.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) This invention provides a water treatment system that realizes smart water management: mainly including ozone production control, automatic start and stop of the water treatment system, automatic circulation and purification, error and alarm linkage control and background control;

[0023] 2) This invention provides a water treatment system that achieves multiple technology couplings: ultraviolet and ozone technology coupling, ultraviolet can sterilize and disinfect, and can increase the ozone yield, ozone can oxidize and decompose organic matter; ozone and activated carbon technology coupling, activated carbon can reduce OC and DBPs, and ozone and activated carbon can form a symbiotic system in this water treatment system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the water storage container I of the present invention;

[0026] Figure 3 This is a schematic diagram of the control subsystem of a preferred embodiment of the present invention;

[0027] Figure 4 This is a graph showing the temperature of the water at the inlet and outlet versus the working time in a preferred embodiment of the present invention;

[0028] Figure 5 This is a graph showing the pH of the water at the inlet and outlet as a function of working time in a preferred embodiment of the present invention.

[0029] Figure 6 This is a graph showing the effect of free chlorine in the water at the inlet and outlet on the working time in a preferred embodiment of the present invention;

[0030] Figure 7 This is a graph showing the total chlorine in the water at the inlet and outlet of a preferred embodiment of the present invention versus the working time;

[0031] Figure 8 UV in the water at the inlet and outlet of the preferred embodiment of the present invention 254 A graph showing working hours (days);

[0032] Figure 9 This is a diagram showing the effect of removing DBPs according to a preferred embodiment of the present invention.

[0033] The attached figures are labeled as follows:

[0034] 2-System inlet, 3-Inlet valve, 4-Water level sensor, 5-Water storage container II, 6-Outer shell II, 7a-Upper limit switch, 7b-Lower limit switch, 8-Top plate II, 9-Water pipeline I, 10a-Main water pump, 10b-Standby water pump, 11-Water pipeline II, 15-First activated carbon filter, 16-Water pipeline III, 17-Second activated carbon filter, 18-Water pipeline IV, 19-Particulate filter, 20-Water pipeline V, 21-Ultraviolet sterilizer 23-Valve II, 25-Water Storage Container I, 26-Outer Shell I, 27a-Upper Limit Switch, 27b-Lower Limit Switch, 28-Top Plate I, 29-Air Vent Valve, 30-Water Pipeline VI, 31-Online Multi-Parameter Water Quality Analyzer, 32-Online Ozone Detector, 36-System Outlet, 41-Oxygen Source, 42-Gas Pipeline I, 43-Ozone Generator, 44-Gas Pipeline II, 45-First Water Jet Launcher, 46-Second Water Jet Launcher, 47-Third Water Jet Launcher 51-Water line VII, 52a-Primary ozone metering pump, 52b-Standby ozone metering pump, 53-Water line VIII, 54-First branch water line, 55-Second branch water line, 56-Third branch water line, 57-First UV device, 58-Second UV device, 59-Third UV device, 61-First junction, 62-Second junction, 63-Third junction, 71-Water line IX, 72-Valve I, 73a-Primary Circulating water pump, 73b-Secondary circulating water pump, 74-Main circulating water pipeline, 80-Control subsystem, 81-Main computer memory, 82-Ozone computer memory, 83-Input device, 84-Output device, 85-Computer subsystem, 90-Main programmable logic controller, 91-Ozone controller, 92-Main microprocessor, 93-Ozone microprocessor, 96-Various sensors, 97-Various system equipment, 100-Water treatment system. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some embodiments of this invention, but not all embodiments.

[0036] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] A water treatment system of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] A water treatment system includes a system inlet 2, a water storage container I 25, a system outlet 36, and an ultraviolet sterilizer 21. The system inlet 2 is fluidly connected to a source water to be treated and flows the treated water into the water treatment system 100. The system inlet 2 is fluidly connected to multiple water pipelines for transporting the treated water along the pipelines. The treated water flows sequentially through a first activated carbon filter 15, a second activated carbon filter 17 downstream of the first activated carbon filter 15, a particulate filter 19 downstream of the second activated carbon filter 17, and a membrane device downstream of the particulate filter 19. The water storage container I 25 is located at the end of the flow path and is used to store the treated water generated by the system. The system outlet 36 is fluidly connected to the water storage container I 25 and is used to transport the treated water to a location outside the water treatment system 100. The ultraviolet sterilizer 21 is located downstream of the system outlet 36.

[0040] The water treatment system 100 also includes an ozone subsystem, a recirculation subsystem, and a main programmable logic controller 90.

[0041] The ozone subsystem includes an ozone generator 43 for generating ozone, and at least one contact along the flow path for introducing ozone into the process water.

[0042] The recirculation subsystem operates periodically to draw treated water from the water storage container I 25 to form circulating water, introduce the circulating water into the water supply line upstream of the ultraviolet sterilizer 21, and return the circulating water to the water storage container I 25.

[0043] The main programmable logic controller 90 is used to control the flow rate of process water through the water treatment system 100, the ozone production, and the intensity of ultraviolet irradiation, and to control the circulation subsystem.

[0044] Preferably, the ozone subsystem extracts treated water from the water storage container and adds ozone to form ozone water. The ozone subsystem introduces the ozone water into the treated water through a first branch water pipeline 54, a second branch water pipeline 55, and a third branch water pipeline 56. The first branch water pipeline 54 is downstream of the second activated carbon filter 17, the second branch water pipeline 55 is between the first activated carbon filter 15 and the second activated carbon filter 17, and the third branch water pipeline 56 is upstream of the first activated carbon filter 15. A first water jet injector 45 and a first ultraviolet device 57 are installed in the first branch water pipeline 54. The second branch water pipeline 55 is equipped with a second water jet injector 46 and a second ultraviolet device 58, and the third branch water pipeline 56 is equipped with a third water jet injector 47 and a third ultraviolet device 59. The first water jet injector 45, the second water jet injector 46, and the third water jet injector 47 are used to introduce ozone into the treated water and form ozone water in the first branch water pipeline 54, the second branch water pipeline 55, and the third branch water pipeline 56, respectively. The first ultraviolet device 57, the second ultraviolet device 58, and the third ultraviolet device 59 are located downstream of the first water jet injector 45, the second water jet injector 46, and the third water jet injector 47, respectively.

[0045] Preferably, the ozone concentration in the treated water is 0.05ppm-2ppm.

[0046] Preferably, the water treatment system 100 further includes an online multi-parameter water quality analyzer 31 for measuring at least one water quality parameter of the process water; the online multi-parameter water quality analyzer 31 is in electronic communication with the main programmable logic controller 90; the main programmable logic controller 90 is programmed to compare at least one water quality parameter measured by at least one sensor with an index value of at least one water quality parameter, and to operate the water treatment system 100 based on the comparison.

[0047] Preferably, the water quality parameters include one or more of residual chlorine, total chlorine, pH, total organic carbon, total dissolved solids, conductivity, and temperature.

[0048] Preferably, the main programmable logic controller 90 includes an ozonation controller 91 or communicates with an ozonation controller 91, the ozonation controller 91 controlling the amount of ozone in the treated water based on a comparison with an ozone concentration index value; the water treatment system 100 further includes an online ozone detector 32, the online ozone detector 32 detecting the ozone concentration, and the ozonation controller 91 controlling the amount of ozone introduced into the process water based on the ozone concentration.

[0049] Preferably, the recirculation subsystem operates automatically on a periodic time basis, and the ultraviolet sterilizer 21 operates together with the recirculation subsystem when it is running.

[0050] Preferably, the water storage container I 25 is a variable volume container, which is provided with a first predetermined water level and a second predetermined water level, and includes at least one water level sensor 4. When the water level in the water storage container I 25 reaches or exceeds the first predetermined water level, the water level sensor 4 sends a signal to notify the process water to enter the system to shut off and sends a signal. When the water level in the container is at or below the second predetermined water level, the process water entering the system is opened. The water treatment system 100 also includes a water storage container II 5, which is the same as the water storage container I 25. The water storage container II 5 is located between the system inlet 2 and the first activated carbon filter 15.

[0051] Preferably, the first activated carbon filter 15 and the second activated carbon filter 17 include at least coal-based activated carbon and bamboo-based activated carbon, wherein composite materials such as zeolite or resin are optionally added.

[0052] Preferably, the membrane device is a ceramic ultrafiltration membrane device, but is not limited to a ceramic ultrafiltration membrane device.

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to preferred embodiments and accompanying drawings. The specific embodiments described herein are merely illustrative and do not limit the scope of the invention.

[0054] refer to Figure 1 The figure illustrates one embodiment of an inlet water treatment system 100. The water treatment system 100 is particularly suitable for treating water from a municipal water supply system (not shown) to provide drinking water for a building's water distribution system (not shown). The water treatment system 100 includes a pipeline network comprising multiple water lines, with a system inlet 2 and a system outlet 36. The system inlet 2 allows process water from the municipal water supply to enter the water treatment system 100 for treatment, and the system outlet 36 allows decontaminated process water to enter the water treatment system 100 as drinking water before entering the building's water distribution system.

[0055] System inlet 2 is equipped with inlet valve 3, which can be opened and closed to allow or prevent process water from flowing into water treatment system 100. A pressure sensor 4 (or a flow meter, if needed) can be used to monitor the flow of water through system inlet 2. Process water enters a closed, variable-volume storage container II 5, which is enclosed within an outer casing II 6. When the top plate II 8 of storage container II 5 encounters the upper limit switch 7a and the lower limit switch 7b during filling and emptying, the upper limit switch 7a and the lower limit switch 7b, located on the side wall of the outer casing II 6, are triggered. The upper limit switch 7a prevents overfilling of storage container II 5 by cutting off the flow of process water into water treatment system 100 when the top plate II 8 rises to the upper limit switch 7a due to the expansion of storage container II 5, while the lower limit switch 7b prevents complete emptying of storage container II 5 by opening it. In the process flow, when the top plate II8 descends to the lower limit switch 7b due to the contraction of the water storage container II5, water enters the water treatment system 100. The treated water flows from the water storage container II5 into the water pipeline I9, which is equipped with a main water pump 10a and a standby water pump 10b. Under normal circumstances, the main water pump 10a operates to deliver the treated water through the water treatment system 100. In the event of a failure of the main water pump 10a, the standby water pump 10b can deliver the treated water through the water treatment system 100. When a larger water flow is required, the main water pump 10a and the standby water pump 10b can operate simultaneously. The main water pump 10a and the standby water pump 10b tend to provide a constant water pressure of approximately 2-10 kg / cm², approximately 6 kg / cm², and a water flow rate in the range of 10-50 L / min, approximately 35 L / min. Process water flows from the main pump 10a and the standby pump 10b converge at a point downstream of the main pump 10a and the standby pump 10b into a single water line II 11. Upper limit switches 7a and 7b, along with pressure sensors 4 and 12a associated with the main pump 10a and the standby pump 10b, and pressure sensor 12b electronically communicating with a main programmable logic controller 90 programmed to control the main controller, inlet valve 3, the main pump 10a, the standby pump 10b, or both, to stop or allow process water flow into the water treatment system 100. The water treatment system 100 may include a standby programmable logic controller that has the same functions as the main programmable logic controller 90 in the event of a failure of the main programmable logic controller 90.

[0056] Process water enters the first activated carbon filter 15 from water line II 11 and flows through the first activated carbon filter 15 to enter water line III 16. Although in the illustrated embodiment, water flows upward through the first activated carbon filter 15 and outwards. It enters water line III 16 through the top of the first activated carbon filter 15; those skilled in the art will understand that alternative flow configurations are possible. Process water flows through water line III 16 to the second activated carbon filter 17 and flows through the second activated carbon filter 17 to enter water line IV 18. The first activated carbon filter 15 and the second activated carbon filter 17 may be equipped with pressure sensors 15a and 17a, respectively, to assist the main programmable logic controller 90 in controlling the water flow and pressure in the water treatment system 100. Any suitable activated carbon can be used in the first activated carbon filter 15 and the second activated carbon filter 17. However, bamboo-derived activated carbon has been found to be particularly effective for at least partially purifying process water. Coal-based activated carbon and bamboo-based activated carbon are preferred in activated carbon filters, but are not limited to these; composite materials such as zeolite and resin can also be selected.

[0057] Treated water flows from water line IV18 through particulate filter 19 into water line V20. Particulate filter 19 comprises a ceramic membrane with a pore size in the range of 1-10 micrometers, preferably about 5 μm. First activated carbon filter 15 and second activated carbon filter 17 remove contaminants from the treated water via adsorption, while particulate filter 19 removes contaminants from the treated water via a size exclusion mechanism. Particulate filter 19 is particularly effective at removing fine carbon particles washed away from the water by the first activated carbon filter 15 and second activated carbon filter 17.

[0058] Processed water enters the variable-volume storage container I 25 from water line V 20. The ultraviolet (UV) sterilizer 21 disinfects bacteria and other organisms in the process water by releasing a bactericidal UV dose in the range of 5-40 mJ / cm². The flow rate of process water through the first activated carbon filter 15, the second activated carbon filter 17, the particulate filter 19, and the UV sterilizer 21 can be controlled by the main programmable logic controller 90 to optimize the residence time of the process water in those devices. The residence time can be adjusted based on water parameters measured at various points upstream of or within the water treatment system 100. The UV sterilizer 21 can include any suitable UV lamp, such as a low-pressure or low-pressure amalgam arc lamp, with the aforementioned UV dose delivered to a maximum treated water flow rate of approximately 60 liters per minute (LPM). Sequential use of multiple water treatment devices, including multiple different types of devices, can more effectively purify process water. When repairing or replacing the storage container I 25, the UV sterilizer 21, or the particulate filter 19, valve II 23 can be used to prevent the treated water from flowing out of the storage container I 25. The first activated carbon filter 15 or the second activated carbon filter 17, the main water pump 10a, the backup water pump 10b, and any water supply lines or other equipment preceding the variable-volume water storage container II5 or water storage container I25. Water enters the water storage container I25 through the bottom; other flow configurations are also possible.

[0059] The design of variable volume water storage container I25 is similar to that of water storage container II5. For example... Figure 2As shown, water storage container I25 is enclosed within housing I26. When the edge of the top plate I28 of water storage container I25 encounters the upper limit switch 27a and the lower limit switch 27b respectively during the filling and emptying of water storage container I25, a trip located on the side wall of housing I26 is triggered. Upper limit switch 27a prevents overfilling. When the top plate I28 rises to the upper limit switch 27a due to the expansion of water storage container I25, the flow of process water into water treatment system 100 is shut off, thus closing the water supply to water storage container I25. Lower limit switch 27b prevents complete emptying of water. When the top plate I28 descends to the lower limit switch 27b due to the contraction of water storage container I25, the flow of treated water into water treatment system 100 to water storage container I25 is opened. Water storage container I25 is a closed, watertight, collapsible / collapsible accordion-shaped or telescopic container. The water storage container I 25 can be made of a flexible but puncture-resistant material or a non-flexible material, wherein continuous portions 25a, 25b, and 25c of the water storage container I 25 are nested to form a expandable but watertight container. Upper limit switches 27a and lower limit switches 27b are also electronically connected to the main programmable logic controller 90. Additionally, the housing I 26 is equipped with an exhaust valve 29 to allow air to enter or escape from the housing I 26 due to the expansion or contraction of the water storage container I 25. Furthermore, a weight can be placed on top of the top plate I 28 to maintain or provide greater pressure within the water storage container I 25.

[0060] The purified treated water in storage container I 25 flows out through the bottom of storage container I 25 into water line VI 30, and passes through online multi-parameter water quality analyzer 31 and online ozone detector 32 before flowing out of the system. When a user has a drinking water demand, such as in a building served by water treatment system 100, for example when it is started by turning on a tap, water flows out through system outlet 36. Online multi-parameter water quality analyzer 31 is a multi-parameter water quality analyzer that monitors at least one or more of residual chlorine, total chlorine, pH, conductivity, temperature, and total organic carbon and total dissolved solids in real time, and can monitor more water quality parameters. Ozone levels can be monitored periodically by manual sampling by technicians, or in addition to online ozone detector 32. Online multi-parameter water quality analyzer 31 and online ozone detector 32 communicate electronically with main programmable logic controller 90. The online multi-parameter water quality analyzer 31 and the online ozone detector 32 are used to control the operation of the main water pump 10a, the standby water pump 10b, and other pumps in the circulation subsystem (which will be described in more detail below) to ensure that process water can be circulated in the water treatment system 100 for proper purification.

[0061] The ozone subsystem includes an oxygen source 41, which is fluidly connected to an ozone generator 43 via gas line I 42. The ozone generator 43 generates ozone from oxygen, for example, through dielectric barrier discharge. Alternatively, ozone can be generated by an electrolytic ozone generator that directly decomposes some process water to produce ozone. Ozone is transferred from the ozone generator 43 via gas line II 44, and the ozone in gas line II 44 is injected into the system's water pipes at three different locations in the ozone delivery circuit of the water treatment system 100 via a first water jet 45, a second water jet 46, and a third water jet 47. The ozone delivery circuit, part of the ozone subsystem, is controlled by an ozonation controller 91, which includes suitable electronic control devices, such as a programmable logic controller (PLC). The ozonation controller 91 may be part of or communicate with a main PLC 90, thereby optimizing the total water flow and water quality according to preset treatment parameters. The ozone delivery loop includes a water line VII 51 branching off from water line VI 30, which exits from the bottom of water storage container I 25. Contaminated process water from water storage container I 25 flows through water line VII 51 to a primary ozone metering pump 52a and a backup ozone metering pump 52b. Under normal conditions, the primary ozone metering pump 52a operates to extract purified process water from water storage container I 25 via the ozone delivery loop. In the event of a failure of the primary ozone metering pump 52a, the backup ozone metering pump 52b can pump the contaminated process water. Both the primary and backup ozone metering pumps are equipped with pressure sensors 50a and 50b, respectively, which provide signals to the ozonation controller 91 to control the operation of the primary and backup ozone metering pumps 52a and 52b. The water pressure in the ozone delivery loop is maintained at approximately twice the pressure in the rest of the pipes, for example, a constant water pressure of about 12 kg / cm². However, the water flow ratio between the rest of the pipes and the ozone delivery loop is maintained at a high ratio, for example, 10:1. Therefore, the ozone delivery loop has almost no effect on the water pressure in the rest of the pipes.

[0062] The decontaminated process water flows into water pipeline VIII 53 from ozone feed pump 52a (primary ozone metering pump) and standby ozone metering pump 52b. The decontaminated process water is then transported to the first branch water pipeline 54, the second branch water pipeline 55, and the third branch water pipeline 56. The first water jet injector 45 injects ozone into the water in the first branch water pipeline 54. The second water jet injector 46 injects ozone into the water in the second branch water pipeline 55. The third water jet injector 47 injects ozone into the water in the third branch water pipeline 56. The first, second, and third water jet injectors 45, 46, and 47 inject ozone in a nanoscale form, creating uniformly distributed bubbles in the water. The ozone dosage is in the range of 0.05-2.0 ppm, preferably 0.05-0.5 ppm. The ozone concentration in the pipeline can be controlled by adjusting the ozone generator 43 and / or by adjusting the first, second, and third water jet injectors 45, 46, and 47. Ozone control is automatically executed by an ozonation controller 91, which adjusts the ozone concentration in response to water quality and ozone concentration. Information is collected by an online multi-parameter water quality analyzer 31 and an online ozone detector 32. Water from the first branch water line 54, the second branch water line 55, and the third branch water line 56 flows through the first ultraviolet (UV) device 57, the second UV device 58, and the third UV device 59, respectively, for further decontamination and to promote ozone conversion and utilization (AOP) through an advanced oxidation process. AOP is known to convert ozone into reactive oxygen species that are highly reactive with organic matter, and can be used to remove chemical pollutants, bacteria, viruses, and other microorganisms from water. The dimensions of the first UV device 57, the second UV device 58, and the third UV device 59 should be able to provide a UV dose of 5-40 mJ / cm² within a water flow range of 1-50 LPM; UV-LEDs are preferred.

[0063] The first branch water line 54 connects to water line V20 at the first junction 61, allowing ozone-rich water in the first branch water line 54 to flow into the process water between the second activated carbon filter 17 and the water storage container I25. Therefore, the first branch water line 54 is responsible for adding ozone to the decontamination process water in the water storage container I25. The second branch water line 55 connects to water line III16 at the second junction 62, allowing ozone-rich water in the second branch water line 55 to flow into the treated water between the first activated carbon filter 15 and the second activated carbon filter 17. Therefore, the second branch water line 55 is responsible for adding ozone to the second activated carbon filter 17. The third branch water line 56 connects to water line II11 at the third junction 63: the third branch water line 56 allows ozone-rich water in the third branch water line 56 to flow into the process water before the first activated carbon filter 15. Therefore, the third branch water line 56 is responsible for adding ozone to the first activated carbon filter 15.

[0064] The recirculation subsystem can be used simultaneously with and / or during periods of low water consumption, such as at night, to ensure continuous purification of process water even when the water treatment system 100 has little or no demand. Water line IX71 branches off from water line VI30 after the online multi-parameter water quality analyzer 31 and the online ozone detector 32. Valve I72 in water line IX71 can be closed when the recirculation subsystem is not needed or required. Maintenance is underway. Purified process water from storage container I25 is pumped through water line IX71 by primary circulating water pump 73a. In the event of a failure of primary circulating water pump 73a, secondary circulating water pump 73b is used to extract purified process water from storage container I25. Both primary circulating water pump 73a and secondary circulating water pump 73b can be used simultaneously if a higher circulating water flow rate is required. Primary circulating water pump 73a and secondary circulating water pump 73b can be equipped with pressure sensors 70a and 70b respectively, and pressure sensors 70a and 70b communicate electronically with the main programmable logic controller 90 to automatically control pressure and flow according to the programming in the main programmable logic controller 90. Water in water line IX 71 is pumped into the main circulating water line 74, which connects to water line V 20 after the second activated carbon filter 17. The circulating water is combined with process water before passing through the particulate filter 19, and then flows through the junction for ozone treatment by an ozone sterilizer. In this case, the circulating water undergoes filtration, ozone treatment, and ultraviolet disinfection before returning to the storage container I 25.

[0065] Choose the regular circulation interval and duration based on the desired water quality. When water usage is low or nonexistent, a cycle interval of 12-16 hours is recommended. Use a circulation duration of 15-30 minutes. Maintain normal water pressure in the water treatment system 100 between its upper and lower limits. If the pressure in the water treatment system 100 exceeds the limit due to the operation of the recovery subsystem, an alarm may be triggered, and the recovery subsystem may be shut down until the problem is resolved.

[0066] The recirculation subsystem can be operated based on water quality parameters measured by the online multi-parameter water quality analyzer 31. If any one or more water quality parameters are outside a predetermined range, the main programmable logic controller 90 can automatically operate the recirculation subsystem to improve the quality of the decontamination process water leaving the system outlet 36.

[0067] The water treatment system 100 may include various other subsystems and / or valves. Valves located at various points in the pipeline can be operated to isolate all or part of the water treatment system 100 from the municipal water supply and the building's water distribution system to facilitate maintenance or replacement of the entire water treatment system 100 or parts thereof. Furthermore, the water treatment system 100 may include a residual ozone collection and treatment subsystem (not shown) in communication with the first activated carbon filter 15, the second activated carbon filter 17, the water storage container I 25, and the primary circulating water pump 73a and the secondary circulating water pump 73b to prevent ozone leakage into the atmosphere.

[0068] Reference Figure 3 The control subsystem 80 of the water treatment system 100 includes a computer subsystem 85, which includes a main programmable logic controller 90, an ozonation controller 91, an input device 83, and an output device 84. The main programmable logic controller 90 includes a main microprocessor 92 and a main computer memory 81, and the ozonation controller 91 includes an ozonation microprocessor 93 and an ozonation computer memory 82. The main computer memory 81 and the ozonation computer memory 82 are in electronic communication with their respective main microprocessors 93 and include transient electronic storage media for storing data collected by various sensors and / or for storing computer-executable code for executing instructions for implementing the method. The main computer memory 81 and the ozonation computer memory 82 may further include transient memory (e.g., random access memory (RAM)) accessible by the main microprocessor 92 and the ozonation microprocessor 93 during code execution. Input device 83 and output device 84 communicate electronically with main programmable logic controller 90 and ozonation controller 91, and can be local or remote relative to main programmable logic controller 90 and ozonation controller 91. Output device 84 can be a monitor, printer, or interface with remote output devices, etc. Input device 83 can be a keyboard, mouse, microphone, or device interfaced with remote input devices, etc. Main programmable logic controller 90 and ozonation controller 91 also communicate electronically with various sensors 96 and various system devices 97. Electronic communication can be hardwired or wireless. Electronic communication can be dedicated or can be connected via the Internet.

[0069] The main programmable logic controller 90 and the ozonation controller 91 are programmed to automatically control various system parameters in response to data received from various sensors. The following description of control characteristics pertains to the main programmable logic controller 90, but can also be applied to the ozonation controller 91.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water treatment system, comprising a system inlet (2), a water storage container I (25), a system outlet (36), and an ultraviolet sterilizer (21), characterized in that, The system inlet (2) is fluidly connected to the water source to be treated and flows the treated water into the water treatment system (100). The system inlet (2) is fluidly connected to multiple water pipelines for transporting the treated water along the pipelines. The treated water flows sequentially through the first activated carbon filter (15), the second activated carbon filter (17) downstream of the first activated carbon filter (15), the particulate filter (19) downstream of the second activated carbon filter (17), and the membrane device downstream of the particulate filter (19). The water storage container I (25) is located at the end of the flow path and is used to store the treated water generated by the system. The system outlet (36) is fluidly connected to the water storage container I (25) and is used to transport the treated water to a location outside the water treatment system (100). The ultraviolet sterilizer (21) is located downstream of the system outlet (36). The water treatment system (100) also includes an ozone subsystem, a recirculation subsystem, and a main programmable logic controller (90). The ozone subsystem includes an ozone generator (43) for generating ozone, and at least one contact along the flow path for introducing ozone into the process water. The recirculation subsystem operates periodically to draw treated water from storage container I (25) to form circulating water, introduces the circulating water into the water supply line upstream of the ultraviolet sterilizer (21), and returns the circulating water to storage container I (25). The main programmable logic controller (90) is used to control the flow rate of process water through the water treatment system, the production of ozone and the intensity of ultraviolet irradiation, and to control the circulation subsystem. The ozone subsystem extracts treated water from the water storage container and adds ozone to form ozone water. The ozone subsystem introduces the ozone water into the treated water through a first branch water pipeline (54), a second branch water pipeline (55), and a third branch water pipeline (56). The first branch water pipeline (54) is downstream of the second activated carbon filter (17), the second branch water pipeline (55) is between the first activated carbon filter (15) and the second activated carbon filter (17), and the third branch water pipeline (56) is upstream of the first activated carbon filter (15). The first branch water pipeline (54) is equipped with a first water jet injector (45) and a first ultraviolet device (57). The second branch water pipeline... A second water jet (46) and a second ultraviolet device (58) are installed in the line (55), and a third water jet (47) and a third ultraviolet device (59) are installed in the third branch water line (56). The first water jet (45), the second water jet (46) and the third water jet (47) are used to introduce ozone into the treated water and form ozone water in the first branch water line (54), the second branch water line (55) and the third branch water line (56) respectively. The first ultraviolet device (57), the second ultraviolet device (58) and the third ultraviolet device (59) are located downstream of the first water jet (45), the second water jet (46) and the third water jet (47) respectively. It also includes an online multi-parameter water quality analyzer (31) for measuring at least one water quality parameter of the process water; the online multi-parameter water quality analyzer (31) communicates electronically with the main programmable logic controller (90); the main programmable logic controller (90) is programmed to compare at least one water quality parameter measured by at least one sensor with an index value of at least one water quality parameter, and to operate the water treatment system (100) based on the comparison. The main programmable logic controller (90) includes or communicates with an ozonation controller (91), which controls the amount of ozone in the treated water based on a comparison with an ozone concentration index value; the water treatment system (100) also includes an online ozone detector (32), which detects the ozone concentration, and the ozonation controller (91) controls the amount of ozone introduced into the process water based on the ozone concentration; The water storage container I (25) is a variable volume container, which is provided with a first predetermined water level and a second predetermined water level, and includes at least one water level sensor (4). When the water level in the water storage container I (25) reaches or exceeds the first predetermined water level, the water level sensor (4) sends a signal to notify the process water to enter the system to shut off and sends a signal; when the water level in the container is at or below the second predetermined water level, the process water entering the system is opened. The recirculation subsystem operates automatically on a periodic time basis, and the ultraviolet sterilizer (21) operates together with the recirculation subsystem when it is running; The water treatment system (100) also includes a water storage container II (5) that is the same as the water storage container I (25), the water storage container II (5) being located between the system inlet (2) and the first activated carbon filter (15).

2. The water treatment system according to claim 1, characterized in that, The ozone concentration in the treated water is 0.05 ppm to 2 ppm.

3. The water treatment system according to claim 1, characterized in that, The water quality parameters include one or more of the following: residual chlorine, total chlorine, pH, total organic carbon, total dissolved solids, conductivity, and temperature.

4. A water treatment system according to claim 1, characterized in that, The first activated carbon filter (15) and the second activated carbon filter (17) contain at least coal-based activated carbon and bamboo-based activated carbon, wherein zeolite or resin may be added.

5. A water treatment system according to claim 1, characterized in that, The membrane device is a ceramic ultrafiltration membrane device.

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