High-quality drinking water mineralization treatment device

Abstract

A mineralization treatment device for high-quality drinking water relates to the technical field of water treatment, comprises a grid flocculation unit and a membrane filtration unit, has the advantages of good treatment effect, excellent backwashing effect, various backwashing modes, low operation cost and the like, and is suitable for treatment of various water qualities, and the obtained drinking water is high in quality. According to the invention, raw water is pretreated by adopting a grid flocculation process, and the coagulation efficiency is excellent. The membrane filtration unit can remove most pollutants including bacteria in the water body, the effluent quality is good, the water production mode adopts a gravity mode, and the operation cost is low. In addition, the invention provides a backwashing process integrating multiple modes of in-membrane gas washing, out-membrane gas washing, in-membrane water washing, in-membrane gas water washing and the like, and the backwashing effect is excellent in cooperation with a rotary or suspended desilting method. Various backwashing modes can be freely selected according to actual conditions, the combination forms are diversified, and the device is suitable for various types of membrane pollution conditions and wide in application range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drinking water treatment, in particular to a high-quality drinking water mineralization treatment device. BACKGROUND

[0002] With the continuous improvement of people's living standards, people's quality requirements for daily drinking water have become increasingly high. Natural mineral water has gradually become the first choice for people to drink water due to its unique advantages, that is, it is rich in various minerals and trace elements beneficial to the human body, and is favored by consumers. However, it cannot be ignored that the natural mineral water resources are relatively limited in nature, and their distribution is extremely uneven, which makes it difficult to fully meet the growing demand for high-quality drinking water. Based on this situation, developing a device that can effectively mineralize ordinary drinking water and then improve it to the standard of high-quality mineral water undoubtedly has extremely important practical significance.

[0003] At present, various types of drinking water mineralization devices on the market have exposed some problems that need to be solved in actual application: first, the mineralization effect is not satisfactory. Due to the immaturity of the control technology of mineral addition amount, it is difficult to achieve accurate regulation and control, resulting in poor water quality stability after mineralization, and it is difficult to achieve the ideal state in terms of taste. Secondly, the safety problem is worrying. Some mineral materials may contain substances harmful to the human body, and there are certain safety hazards in the use process, which is difficult to ensure the safety and reliability of drinking water. Thirdly, the device structure is complex, and the cost is high. The existing mineralization equipment is often large in size, not only occupies space, but also the operation and maintenance process is more complicated, which together makes it difficult to popularize and apply in ordinary families, limiting the wide promotion of mineralization technology. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a high-quality drinking water mineralization treatment device with simple structure, convenient operation, good mineralization effect and safety and reliability.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] The high-quality drinking water mineralization treatment device of the present application comprises a pretreatment unit, a cascade filtration unit, a mineralization unit, a sterilization unit and a control unit.

[0007] The pretreatment unit comprises a multi-media filtration assembly, an activated carbon filtration assembly and a precision filtration assembly.

[0008] The cascade filtration unit comprises an anti-pollution ceramic membrane assembly, a nanofiltration membrane assembly and a pulse type backwashing system; the surfaces of the anti-pollution ceramic membrane assembly and the nanofiltration membrane assembly are coated with a TiO2-graphene composite coating with a thickness of 50-100 nm.

[0009] The mineralization unit comprises a first mineralization filter element and a second mineralization filter element.

[0010] The sterilization unit comprises an ultraviolet-light catalysis reaction cavity and an ozone residual detection assembly.

[0011] The control unit comprises a microprocessor module, a sensor module, an actuator module and a user interaction module.

[0012] The water outlet end of the precision filtration assembly of the pretreatment unit is connected to the water inlet end of the anti-pollution ceramic membrane assembly of the cascade filtration unit through a pipeline; the water outlet end of the nanofiltration membrane assembly of the cascade filtration unit is connected to the water inlet end of the first mineralization filter element of the mineralization unit through a pipeline; the water outlet end of the second mineralization filter element of the mineralization unit is connected to the water inlet end of the sterilization unit through a pipeline; and the water outlet end of the sterilization unit is connected to the user water point through a pipeline.

[0013] The control unit is electrically connected to the sensors and actuators of the pretreatment unit, the cascade filtration unit, the mineralization unit and the sterilization unit through wires, and the microprocessor module is in bidirectional communication with the user interaction module.

[0014] Further, the backwashing system comprises a backwashing water tank, a high-pressure air pump, a backwashing water pipe and a backwashing air pipe; one end of the backwashing water pipe is connected to the backwashing water tank, and the other end is connected to the water outlet end of the ceramic membrane assembly and the nanofiltration membrane assembly, respectively; one end of the backwashing air pipe is connected to the high-pressure air pump, and the other end is connected to the backwashing water pipe; pulse valves are arranged on the backwashing water pipe and the backwashing air pipe, and the pulse valves are electrically connected to the control unit.

[0015] Further, the pressure of the high-pressure air pump is 0.3-0.5 MPa, the frequency of the pulse valve is 1-3 times per minute, and the pulse duration is 0.5-1 s.

[0016] Further, the backwashing frequency of the pulse backwashing system is 1 time per 3 days.

[0017] Further, the multi-medium filtration assembly can layer and trap suspended solids, silt and colloids in drinking water through filter materials with different particle sizes, and can remove organic matter, residual chlorine, color, odor and the like through the activated carbon filtration assembly; and a filter core with a particle size of 5-10 μm is used as the filter core of the precision filtration assembly.

[0018] Further, the activated carbon filtration assembly is filled with columnar activated carbon particles with a particle size of 3-5 mm and loaded with TiO2 nanoparticles, and the iodine value is 1200-1500 mg / g, and the filling height is 400-600 mm.

[0019] Further, the mineralization material is a natural mineral or a composite mineralization material composed of one or more of calcium, magnesium, potassium, sodium, strontium and selenium; the natural mineral includes medical stone, wood fish stone, coral sand or germanite.

[0020] Further, the sterilization unit is a nano TiO2 coating on the inner wall of the ultraviolet sterilization cavity, and the TiO2 is an anatase type with a particle size of 20-30 nm.

[0021] The present application combines the "graphene hydrophobic coating" with the "TiO2 photocatalytic coating", optimizes the backwashing structure, and realizes the "anti-adhesion + self-degradation + efficient backwashing" triple anti-pollution mechanism, instead of simply replacing the membrane material.

[0022] The present application has the following advantages:

[0023] ① Good mineralization effect: the multi-layer mineralization filter core structure and precise control technology can effectively add beneficial minerals and trace elements to the human body, improve the taste and nutritional value of the water.

[0024] ② Safe and reliable: safe and non-toxic mineralization materials are selected, and a sterilization unit and a water quality monitoring system are provided to ensure the health and safety of the mineralized water.

[0025] ③ Simple structure and easy operation: the device has a compact structure, is easy to operate and maintain, and is suitable for use in communities, offices and other places.

[0026] ④ Low cost: modular design is adopted, which is convenient for production and maintenance, and effectively reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of a high-quality drinking water mineralization treatment device according to the present application. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the embodiments and drawings, but the present application is not limited by the following embodiments.

[0029] As shown in Figure 1 , the high-quality drinking water mineralization treatment device according to the present application comprises a pretreatment unit, a stepped filtration unit, a mineralization unit, a sterilization unit and a control unit connected in sequence.

[0030] As a specific embodiment of the high-quality drinking water mineralization treatment device according to the present application, please refer to Figure 1 : raw water is purified by the pretreatment unit and the stepped filtration unit, and then enters the mineralization unit for mineralization treatment in the mineralization filter core to add minerals and trace elements. The mineralized water is sterilized in the sterilization unit for user drinking.

[0031] The control unit is electrically connected with the sensors and actuators of the pretreatment unit, the cascade filtration unit, the mineralization unit and the sterilization unit through wires, so as to realize real-time monitoring and automatic control of the operation parameters of each unit; the units are connected through food-grade 304 stainless steel pipelines, and each pipeline is provided with an electric valve which is electrically connected with the control unit and used to control the water flow.

[0032] The pretreatment unit comprises a multi-medium filtration assembly, an activated carbon filtration assembly and a precision filtration assembly which are connected in sequence, and each assembly is provided with an independent backwashing system.

[0033] The shell of the multi-medium filtration assembly is cylindrical (material: food-grade PP); the shell is filled with filter materials from bottom to top: the bottom layer is quartz sand with a particle size of 2-4 mm (thickness 200-300 mm), the middle layer is anthracite with a particle size of 1-3 mm (thickness 150-200 mm), and the upper layer is manganese sand with a particle size of 0.5-1 mm (thickness 100-150 mm); the backwashing system comprises a backwashing water inlet pipe (connected with municipal high-pressure water) arranged at the top of the shell and a backwashing water outlet pipe (connected with a sewage pipe) arranged at the bottom of the shell, and an electric backwashing valve is arranged on each of the backwashing water inlet pipe and the backwashing water outlet pipe and electrically connected with the control unit; the shell structure of the activated carbon filtration assembly is consistent with that of the multi-medium filtration assembly, and the shell is filled with columnar activated carbon loaded with nano TiO2 (particle size 3-5 mm, iodine value 1200-1500 mg / g, filling height 400-600 mm); the shell is cylindrical, and 1-2 pieces of 5-10 μm folded PP cotton filter cores (filtering area ≥1.5 m²) are arranged in the shell; a differential pressure sensor is arranged on the outer side of the shell and electrically connected with the control unit, and the control unit triggers an alarm when the differential pressure is greater than or equal to 0.08 MPa due to blockage of the filter core.

[0034] The cascade filtration unit comprises an anti-pollution ceramic membrane assembly and a nanofiltration membrane assembly which are connected in sequence and provided with a pulse backwashing system.

[0035] The shell of the anti-pollution ceramic membrane assembly is made of stainless steel, and 3-5 ceramic membrane tubes (pore diameter 0.1-0.2 μm, membrane area ≥0.8 m 2 / root) are arranged in parallel in the shell.

[0036] The outer surface of the ceramic membrane tube is coated with a TiO2-graphene composite coating (thickness 50-100 nm, graphene content 5-10 wt%), which is prepared by a sol-gel method and has hydrophobicity (contact angle > 110°) and photocatalytic activity.

[0037] The nanofiltration membrane assembly membrane shell is made of glass fiber reinforced plastic, and 2-4 roll-type nanofiltration membranes (molecular weight cutoff 150-300 Da, desalination rate 30-50%) are installed in the shell; a spiral flow guide net is arranged on the water inlet side of the nanofiltration membrane, which is used for optimizing water flow distribution and reducing concentration polarization;

[0038] The pulse backwashing system comprises a backwashing water tank, a high-pressure air pump, a backwashing water pipe and a backwashing gas pipe; one end of the backwashing water pipe is connected to the backwashing water tank, and the other end is connected to the water outlet of the ceramic membrane assembly and the nanofiltration membrane assembly; one end of the backwashing gas pipe is connected to the high-pressure air pump (pressure 0.3-0.5 MPa), and the other end is connected to the backwashing water pipe; pulse valves (frequency 1-3 times per minute, pulse duration 0.5-1 s) are arranged on the backwashing water pipe and the backwashing gas pipe, and the pulse valves are electrically connected to the control unit.

[0039] The mineralization unit comprises a first-stage mineralization filter element and a second-stage mineralization filter element connected in series, and is provided with a flow regulating assembly.

[0040] The first-stage mineralization filter element is made of food-grade ABS material, and the shell is filled with a porous ceramic carrier (pore size 50-100 μm, porosity 60-70%); the porous ceramic carrier is loaded with a temperature-sensitive mineralization material composed of poly-N-isopropyl acrylamide microspheres coated with calcium-magnesium composite salt (CaCO3-MgCO3, mass ratio 3:1), and the content of the PNIPAM microspheres accounts for 20-30% of the total mass of the mineralization material.

[0041] The second-stage mineralization filter element has the same shell structure as the first-stage mineralization filter element, and the shell is filled with a composite natural mineral, i.e., a mixture of medical stone (particle size 2-4 mm, content 50%), woodfish stone (particle size 2-4 mm, content 30%) and coral sand (particle size 1-2 mm, content 20%); a porous partition plate (pore size 1-2 mm) is arranged between the mineral layers for uniform water distribution.

[0042] The flow regulating assembly comprises an electromagnetic flowmeter (range 0.1-2 m 3 / h) arranged at the water inlet end of the first-stage mineralization filter element and an electric regulating valve arranged at the water outlet end of the second-stage mineralization filter element; the electromagnetic flowmeter and the electric regulating valve are electrically connected to the control unit, and the control unit adjusts the opening of the electric regulating valve according to the water flow rate detected by the flowmeter (set range 0.5-1 m 3 / h) to control the mineralization contact time (10-20 s).

[0043] The sterilization unit comprises an ultraviolet-light catalytic reaction cavity and an ozone residual detection assembly.

[0044] The ultraviolet photocatalytic reaction cavity is made of stainless steel, and the inner wall of the cavity is coated with an Anatase type nano-TiO2 coating (thickness 20-30 nm, particle size 10-20 nm); 1-2 low-pressure mercury lamps (wavelength 254 nm, power 30-50 W) are hung in the center of the reaction cavity, and a quartz sleeve (transmittance ≥ 95%) is arranged outside the mercury lamp; a flow guide plate (opening rate 30-40%) is arranged at the water inlet end and the water outlet end of the reaction cavity to prolong the residence time of the water flow in the cavity (15-20 s);

[0045] The ozone residual detection assembly is an ozone sensor (detection range 0-0.1 mg / L, accuracy 0.001 mg / L) arranged at the water outlet end of the reaction cavity, and the ozone sensor is electrically connected with the control unit; if the residual ozone is detected to be ≥ 0.005 mg / L, the control unit triggers the electric bypass valve at the water outlet end of the reaction cavity to return the water to the reaction cavity for secondary sterilization until the residual ozone is < 0.001 mg / L.

[0046] The control unit comprises a microprocessor module, a sensor module, an actuator module and a user interaction module.

[0047] The sensor module comprises a temperature sensor (arranged at the water inlet end of the pretreatment unit), a pH sensor (arranged at the water outlet end of the cascade filtration unit), a mineral concentration sensor (arranged at the water outlet end of the mineralization unit) and a conductivity sensor (arranged at the water outlet end of the sterilization unit).

[0048] The actuator module comprises electric valves, backwashing valves, pulse valves, electric regulating valves, ultraviolet lamps and high-pressure air pumps of each unit; the output end of the microprocessor module is electrically connected with each actuator through a relay, and the following can be controlled: backwashing frequency of the pretreatment unit (activated when the pressure difference ≥ 0.08 MPa), backwashing parameters of the cascade filtration unit (pulse frequency 1-3 times per minute), water flow rate of the mineralization unit (0.5-1 m³ / h) and power of the ultraviolet lamp of the sterilization unit (30-50 W).

[0049] The user interaction module is a touch screen (arranged on the surface of the device shell), which can display real-time water quality data (mineral concentration, pH, conductivity). The touch screen and the microprocessor module communicate bidirectionally, and after the user selects a mode, the microprocessor automatically matches the corresponding mineralization time and sterilization intensity parameters.

[0050] In the pretreatment stage of the embodiment, raw water enters the pretreatment unit through a municipal pipeline, and sequentially passes through a multi-medium filtration assembly (to intercept silt and colloids), a modified activated carbon filtration assembly (to adsorb organic matter and residual chlorine) and a precision filtration assembly (to intercept small particles); the control unit monitors the state of the precision filtration assembly through a differential pressure sensor, and the backwashing system is activated when the differential pressure exceeds the standard.

[0051] Stage filtration: the pretreated water enters the stage filtration unit, first through the anti-pollution ceramic membrane assembly to remove bacteria and macromolecular organic matter, and then through the nanofiltration membrane assembly to selectively remove harmful ions; the control unit starts the pulse backwashing system every 3 days to restore the membrane flux.

[0052] Mineralization stage: the filtered water enters the mineralization unit, the primary mineralization filter core releases Ca 2+ , Mg 2+ through temperature-sensitive materials, and the secondary mineralization filter core supplements trace elements; the control unit adjusts the electric regulating valve according to the electromagnetic flowmeter data to ensure stable mineralization contact time.

[0053] Sterilization stage: the mineralized water enters the sterilization unit, the ultraviolet-light catalysis synergistic reaction chamber kills microorganisms, and the ozone sensor detects the residue, triggering secondary sterilization when the standard is exceeded.

[0054] Control stage: the microprocessor module collects real-time sensor data, and users can select the operation mode through the touch screen to achieve personalized mineralization.

[0055] In this embodiment, the pretreatment unit includes PP cotton filter core, activated carbon filter core and softening resin filter core, which are used to remove silt, rust, residual chlorine, odor and part of hardness in water.

[0056] In this embodiment, the stage filtration unit includes functional ceramic membrane filtration, nanofiltration, reverse osmosis and other filtration units, which realize the selective removal of pollutants in water while achieving the selective removal of ions in water, removing harmful ions and controlling the concentration of beneficial ions within a reasonable range.

[0057] 1) According to this embodiment, membrane flux experiment is performed on raw water:

[0058] The raw water is municipal tap water (water temperature 15~35℃, pH 6.5~8.5, residual chlorine 0.2~0.5mg / L, hardness 150~250mg / L), and the continuous operation is 30 days.

[0059] The control group uses ceramic membrane, and the others are the same as Example 1. The experimental group is Example 1; the initial flux is set to 15LMH, the flux is measured 3 times a day, backwashing is performed on the 10th, 20th and 30th day (1 time / day for the control group and 1 time / 3 days for the experimental group), and the flux after backwashing is recorded. The results are shown in Table 1.

[0060] Table 1

[0061]

[0062] As shown in the above table, the anti-pollution ability of the experimental group membrane is significantly improved, the flux attenuation is slow, and the backwashing effect is good.

[0063] 2) Bactericidal experiment detection

[0064] The control group adopts "ultraviolet + ozone + silver ions", and the others are the same as example 1.

[0065] The experimental group is example 1.

[0066] E. coli (concentration 10 6 CFU / mL) is added to raw water, and the number of bacteria is measured after sterilization; gas chromatography is used to measure ozone residue, and atomic absorption spectrophotometry is used to measure silver ion concentration; the killing rate of E. coli, ozone residue and silver ion concentration are detected, and the results are shown in table 2.

[0067] Table 2

[0068]

[0069] As shown in table 2, the sterilization effect of the experimental group is better, and there is no residual risk, and the safety is higher.

[0070] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the concept and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for mineralization of high-quality drinking water, characterized in that, It includes a pretreatment unit, a cascade filtration unit, a mineralization unit, a sterilization unit and a control unit; The pretreatment unit comprises a multi-medium filtration assembly, an activated carbon filtration assembly and a precision filtration assembly; The cascade filtration unit comprises an anti-pollution ceramic membrane assembly, a nanofiltration membrane assembly and a pulse backwashing system; the anti-pollution ceramic membrane assembly and the nanofiltration membrane assembly are both coated with a TiO2-graphene composite coating with a thickness of 50-100 nm; The mineralization unit comprises a primary mineralization filter core and a secondary mineralization filter core; The sterilization unit comprises an ultraviolet-light catalytic reaction cavity and an ozone residual detection assembly; The control unit comprises a microprocessor module, a sensor module, an actuator module and a user interaction module; The water outlet end of the precision filtration assembly of the pretreatment unit is connected to the water inlet end of the anti-pollution ceramic membrane assembly of the cascade filtration unit through a pipeline; the water outlet end of the nanofiltration membrane assembly of the cascade filtration unit is connected to the water inlet end of the primary mineralization filter core of the mineralization unit through a pipeline; the water outlet end of the secondary mineralization filter core of the mineralization unit is connected to the water inlet end of the sterilization unit through a pipeline; and the water outlet end of the sterilization unit is connected to a user water point through a pipeline. The control unit is electrically connected to the sensors and actuators of the pretreatment unit, the cascade filtration unit, the mineralization unit and the sterilization unit through wires, and the microprocessor module is in bidirectional communication with the user interaction module.

2. The device for mineralization of high-quality drinking water according to claim 1, characterized in that, The pulse backwashing system comprises a backwashing water tank, a high-pressure air pump, a backwashing water pipe and a backwashing air pipe; one end of the backwashing water pipe is connected to the backwashing water tank, and the other end is connected to the water outlet end of the ceramic membrane assembly and the nanofiltration membrane assembly; one end of the backwashing air pipe is connected to the high-pressure air pump, and the other end is connected to the backwashing water pipe; pulse valves are arranged on the backwashing water pipe and the backwashing air pipe, and the pulse valves are electrically connected to the control unit.

3. The device for mineralization of high-quality drinking water according to claim 2, characterized by the fact that The pressure of the high-pressure air pump is 0.3-0.5 MPa, the frequency of the pulse valve is 1-3 times per minute, and the pulse duration is 0.5-1 s.

4. The device for mineralization of high-quality drinking water according to claim 1, characterized in that, The backwashing frequency of the pulse backwashing system is 1 time per 3 days.

5. The device for mineralization of high-quality drinking water according to claim 1, characterized in that, The multi-medium filtration assembly can remove suspended solids, silt and colloids in drinking water by layering different particle sizes of filter materials, and the activated carbon filtration assembly can remove organic matter, residual chlorine, color, odor and iodine value in the range of 800-1500 by adsorption.

6. The device for mineralization of high-quality drinking water according to claim 1 or 5, characterized by the fact that, The activated carbon filtration assembly is filled with columnar activated carbon particles with a particle size of 3-5 mm and an iodine value of 1200-1500 mg / g, and the filling height is 400-600 mm. The mineralization material is a natural mineral or a composite mineralization material composed of one or more of calcium, magnesium, potassium, sodium, strontium and selenium; the natural mineral includes medical stone, wood fish stone, coral sand or germanium stone.

7. The device for mineralization of high-quality drinking water according to claim 1, characterized in that, The sterilization unit is coated with a nano TiO2 coating on the inner wall of the ultraviolet sterilization cavity, and the TiO2 is anatase with a particle size of 20-30 nm.

8. The device for mineralization of high-quality drinking water according to claim 1, characterized in that, ​

Images