CN113899071B - Electric heating water boiler and water treatment and purification method - Google Patents

Abstract

The invention provides an electric heating water boiler and a water treatment and purification method, wherein the electric heating water boiler comprises a shell with a hollow interior, a water tank is arranged in the shell, a heater is arranged at the bottom in the water tank, the bottom of the water tank is communicated with a first water inlet pipe, the water tank is divided into a heating chamber and a heat preservation chamber, and a water faucet which is communicated with the heat preservation chamber and is provided with water outlet is arranged; an electric oxidation film filtering chamber is arranged in the heat preservation chamber, the electric oxidation film filtering chamber is communicated with the heating chamber through a second water inlet pipe, a booster pump is arranged on the second water inlet pipe, a stainless steel shell is arranged in the electric oxidation film filtering chamber, a filter element is arranged in the stainless steel shell, and the stainless steel shell is communicated with a water outlet pipe; set up a plurality of filtration passageways in the filter core, hug closely every filtration passageway and set up inorganic ceramic composite film layer, the stainless steel casing adsorbs jointly with inorganic ceramic composite film layer and holds back the macromolecule organic matter in the oxidation aquatic. The electric heating boiled water tank can effectively intercept and oxidize to remove organic matters difficult to degrade, and improves the quality of drinking water.

Description

Electric heating water boiler and water treatment and purification method

Technical Field

The invention belongs to the technical field of drinking water purification treatment, and relates to an electric heating water boiler and a water treatment purification method.

Background

The drinking water for life is the basis of human survival and development, along with the development of economy in China and the improvement of the living standard of people, the requirement of people on the quality of drinking water is higher and higher, and tap water reaching the standard cannot meet the requirement of users sometimes.

According to the national drinking water quality standard, the sanitary standard of domestic drinking water is implemented (GB 5749-2006), the water quality of the effluent of water works and tap water in various places meet the national drinking water quality standard, but part of low-concentration refractory organic matters are inevitably generated in the tap water, the low-concentration refractory organic matters are difficult to remove only by using the conventional water supply treatment process in the water works, and the concentration of the trace organic matters is close to the specified limit value of the sanitary standard of the domestic drinking water. These trace organics include 2-methylisoborneol, geosmin, acetochlor, and the like. For example, researches show that the nondegradable organic substances 2-methylisoborneol and geosmin are the main reasons for generating odor, the two organic substances are semi-volatile organic substances, can generate unpleasant earthy and musty odor in water, are stable in chemical structure and difficult to oxidize and degrade, the odor threshold of people can be reached when the content of the organic substances in the water exceeds 10ng/L, so that the users are brought with bad drinking experience, and lose trust on the safety of drinking water, therefore, the improvement of the quality of the drinking water is of great importance to the life quality of the people.

In order to meet the demand of users for high-quality drinking water, direct drinking water is installed in communities of some cities, but the direct drinking water system is not completely popularized nationwide. In recent years, more and more people buy the water purifier, but the life of the water purifier is short, and a filter membrane in the water purifier needs to be replaced regularly, so that the requirement of a user on high-quality drinking water is met, but the water purifier is not convenient enough, and the drinking water is polluted when the water purifier is not used properly.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an electric heating water boiler and a water treatment and purification method.

In order to solve the technical problems, the invention adopts the following technical scheme:

an electric heating water boiler comprises a shell with a hollow interior, wherein a water tank is arranged in the shell, a heater is arranged at the bottom of the interior of the water tank, a first water inlet pipe is communicated with the bottom of the water tank, the water tank is divided into a heating chamber and a heat preservation chamber, and a water faucet with a water outlet is communicated with the heat preservation chamber;

an electric oxidation film filtering chamber used for processing water conveyed in the heating chamber is arranged in the heat preservation chamber, the electric oxidation film filtering chamber is communicated with the heating chamber through a second water inlet pipe, a booster pump is arranged on the second water inlet pipe, a stainless steel shell is arranged in the electric oxidation film filtering chamber, a filter element is arranged in the stainless steel shell, a water outlet pipe is communicated with the stainless steel shell, and purified water processed by the filter element is conveyed to the bottom of the heat preservation chamber through the water outlet pipe;

set up a plurality of filtration passageways in the filter core, hug closely every it sets up inorganic ceramic composite film layer to filter the passageway, stainless steel casing with inorganic ceramic composite film layer adsorbs jointly and intercepts the macromolecule organic matter in the oxidation aquatic.

Further, an inorganic ceramic composite film layer, a transition layer and a support layer are sequentially arranged close to the filter channel, the thickness of the inorganic ceramic composite film layer is 50-60 mu m, the thickness of the transition layer is 10-100 mu m, and the thickness of the support layer is 200-500 mu m.

Specifically, the inorganic ceramic composite film layer comprises an inorganic ceramic film and a boron-doped diamond film loaded on the inorganic ceramic film, the boron-doped diamond film is taken as an anode, and the stainless steel shell in the electrooxidation film filtering chamber is taken as a cathode.

More specifically, the filter core is connected and is set up the upper cover, the filter core inserts behind the stainless steel casing, the upper cover is located stainless steel casing one end, set up the sealing member between filter core and the stainless steel casing.

Furthermore, the heating chamber and the heat preservation chamber are all provided with exhaust pipes in a penetrating mode, the bottom of the heating chamber and the bottom of the heat preservation chamber are provided with drain valves, the stainless steel shell is further communicated with a concentrated water pipe, and the concentrated water pipe penetrates out of the stainless steel shell and then is wound on the first water inlet pipe and penetrates out of the shell.

Specifically, a controller is arranged below the water tank in the shell, and the controller is connected with the heater through a lead.

Specifically, the water tank is provided with a sensor assembly, the sensor assembly comprises a first sensor for detecting temperature, a second sensor for detecting water level and a third sensor, and the sensor assembly is connected with the controller through a lead.

Furthermore, set up the solenoid valve of control intaking on the first inlet tube, the solenoid valve with the controller passes through the wire and connects.

Specifically, the shell is provided with a main switch, an electrode switch, a display screen and a plurality of indicator lamps.

The invention relates to a water treatment purification method, in particular to an electric heating water boiler, which comprises the steps of filtering and cleaning water conveyed from a heating chamber by using a filter element of an electric oxidation film filtering chamber, heating the water, and simultaneously carrying out electrocatalytic oxidation on the water to generate hydroxyl radicals for removing refractory organic matters;

the load capacity of the boron-doped diamond film on the inorganic ceramic film is 8 to 12mg/cm²The oxygen evolution potential of the boron-doped diamond film is 2.8V.

Compared with the prior art, the invention has the following technical effects:

the electric heating boiled water tank can effectively intercept and oxidize to remove organic matters difficult to degrade, remove a series of potential problems of odor, bacteria and the like in tap water, improve the quality of drinking water and avoid the bad drinking experience of people on the drinking water. The inorganic ceramic composite membrane electrode in the electric heating water boiling tank can simultaneously intercept and oxidize macromolecular organic matters in water, thereby achieving the self-cleaning effect, keeping the flux of the membrane electrode at a higher level and prolonging the service life.

Drawings

FIG. 1 is a schematic sectional view of an electric water boiler according to the present invention;

FIG. 2 is a schematic view of a filter cartridge of the electro-oxidation membrane filter chamber;

FIG. 3 is a cross-sectional view of the cartridge;

FIG. 4 is an enlarged partial schematic view at A of FIG. 3;

FIG. 5 is a side view of an electrically heated water boiler;

fig. 6 is a control circuit diagram of the electric heating water boiler;

FIG. 7 is a graph of TOC degradation efficiency of the electric water boiler in the example;

FIG. 8 is a graph of the three-dimensional fluorescence spectrometer for the analysis of the conversion of organic matter components in drinking water in the examples;

FIG. 9 is a graph of the TOC oxidation performance of an electrically heated water boiler for tap water at different conductivity conditions;

FIG. 10 is a graph of the TOC oxidation performance of an electrically heated water boiler on tap water at different hardness conditions;

FIG. 11 shows the TOC oxidation efficiency of an electrically heated water boiler under different alkalinity conditions;

the reference numerals in the drawings denote:

10. a housing; 11. a top cover; 12. a saddle; 13. a supporting corner; 14. a master switch; 15. an electrode switch; 16. a display screen; 17. a first indicator light; 18. a second indicator light; 19. a third indicator light; 20. a water tank; 21. a heat-insulating layer; 22. a heater; 23. filtering the electro-oxidation film; 231. a second water inlet pipe; 232. a booster pump; 233. an upper cover; 234. a filter element; 235. a stainless steel housing; 236. a water outlet pipe; 237. a concentrated water pipe; 238. a seal member; 239. a filtration channel; 24. a sensor assembly; 241. a first sensor; 242. a second sensor; 243. a third sensor; 244. a wire; 25. a faucet; 26. an exhaust pipe; 27. a first water inlet pipe; 271. an electromagnetic valve; 28. a blowoff valve; 29. a controller;

the invention is described in detail below with reference to the drawings and the detailed description.

Detailed Description

The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.

The terms to which the present invention relates are explained as follows:

the inorganic ceramic film, the boron-doped diamond film and the stainless steel used in the invention are all commercially available.

The inorganic ceramic composite film layer takes porous ceramic as a carrier support and is made of TiO₂After inorganic materials are uniformly mixed with additives for reaction and molding, the mixture is calcined at high temperature to form a solid film which has good mechanical strength and good thermal stability, and a boron-doped diamond film is deposited on the surface of the solid microporous ceramic film, so that the inorganic film is conductive, and the processes of film filtration and electrocatalytic oxidation are completed.

Total Organic Carbon (TOC) refers to the total carbon content of soluble and suspended organic matter in water. TOC is a rapid assay of the total organic content of water expressed as carbon. CO produced by catalytic oxidation of carbon in water can be measured₂To be determined. The testing method and the testing instrument are the conventional instruments and methods.

The three-dimensional fluorescence spectrum is a Matrix spectrum (Excitation-Emission-Matrix spectrum) characterized by three-dimensional coordinates of Excitation wavelength (y-axis)), emission wavelength (x-axis), and fluorescence intensity (z-axis), and is also called Total luminescence spectrum (Total luminescence spectrum). A typical fluorescence spectrum is a plan view of the fluorescence intensity versus emission wavelength scan. Such as with a television fluorometer. It is composed of orthogonal multicolor device, TV detector and electronic computer interface, and can automatically obtain three-dimensional fluorescence spectrum. Are conventional measuring instruments and methods.

The electric heating water boiler comprises a filter element using an electric oxidation film filter chamber to filter and clean water conveyed from a heating chamber; the method specifically comprises the following steps:

tap water enters a water heating chamber in the water tank through a water inlet pipe and an electromagnetic valve, boiled water firstly enters an electro-oxidation film filtering chamber under the action of a booster pump, and the boiled water sequentially undergoes physicochemical actions in the electro-oxidation film filtering chamber, namely heating-multi-channel inorganic ceramic composite film filtering-multi-channel inorganic ceramic composite film electrode oxidation. The organic matter in water includes 2-methyl isoborneol, geosmin, acetochlor, etc.

One of the two types of substances is physical interception, namely the filtering action of an inorganic ceramic membrane, and the other one is screening action, wherein small molecular substances in water permeate through the membrane according to different molecular diameters of substances permeating in a certain membrane aperture range, and macromolecular organic substances, bacteria and the like cannot permeate through the membrane; one is adsorption, i.e., macromolecular organic substances are adsorbed on the membrane by chemical bonds, van der waals forces, electrostatic forces, etc.

The other is chemical oxidation, namely electrochemical advanced oxidation technology, namely, hydroxyl radicals (OH) are generated at active sites on an inorganic ceramic composite membrane electrode, and the hydroxyl radicals are obtained mainly by decomposing water: h₂O→·OH+H⁺+ e-, hydroxyl radical is an important active oxygen, has extremely strong oxidability, has an oxidation potential of 2.8eV, is an oxidant second only to fluorine in nature, and can react with refractory organic matters. The strong oxidizing property of hydroxyl free radical can be utilized to destroy the molecular structure of trace organic matters trapped on the composite membrane electrode, bond breaking and addition reaction are carried out on the trace organic matters, macromolecular organic matters are gradually bond breaking and oxidized to form micromolecular aldehyde, ketone and acid substances, and finally the micromolecular aldehyde, ketone and acid substances are mineralized to form CO₂And H₂O, thereby leading the composite membrane to achieve the self-cleaning effect, leading the composite membrane to keep higher membrane flux and prolonging the service life of the inorganic ceramic composite membrane electrode. After the inorganic ceramic membrane is filtered and the electrocatalytic oxidation is carried out, high-quality drinking water flows out of a water outlet pipe in the membrane component and enters a heat preservation chamber, and then a tap is opened for drinking.

Example 1:

according to the technical scheme, as shown in a 1~5, the electric heating water boiler comprises a hollow shell 10, a water tank 20 is arranged in the shell 10, a heater 22 is arranged at the bottom in the water tank 20, a first water inlet pipe 27 is arranged at the bottom of the water tank 20 in a communicating manner, the water tank 20 is divided into a heating chamber and a heat preservation chamber, and a water tap 25 for water outlet is arranged in the communicating manner with the heat preservation chamber; the water tank 20 may be further provided with a heat insulating layer 21 outside thereof to further insulate the heated water. The temperature in the water tank 20 is kept from being lowered for a short time.

In a preferable scheme of the embodiment, the heating chamber and the holding chamber have the same volume and are separated by a stainless steel partition plate. The water tank 20 is a stepped water tank 20. The top cover 11 is arranged on the top of the shell 10, the tray 12 is arranged below the water faucet 25, and an external water container can be placed on the tray 12 to open the water faucet 25. The bottom of the shell 235 may also be provided with an angle 13.

An electric oxidation film filtering chamber 23 used for processing water conveyed in the heating chamber is arranged in the heat preservation chamber, the electric oxidation film filtering chamber 23 is communicated with the heating chamber through a second water inlet pipe 231, a booster pump 232 is arranged on the second water inlet pipe 231, a stainless steel shell 235 is arranged in the electric oxidation film filtering chamber 23, a filter element 234 is arranged in the stainless steel shell 235, a water outlet pipe 236 is communicated with the stainless steel shell 235, and purified water processed by the filter element 234 is conveyed to the bottom of the heat preservation chamber through the water outlet pipe 236;

the booster pump 232 is provided to deliver boiled water from the heating chamber to the electro-oxidation film filtering chamber 23, thereby improving the quality of drinking water. The booster pump 232 provides a pressure difference for the filter element 234 to filter, and when water flows across the membrane surface, only water, inorganic salts and small molecular substances are allowed to permeate through the membrane, but microorganisms and large molecular organic substances in the water are prevented from passing through the membrane by taking the pressure difference as a driving force.

A plurality of filtering channels 239 are arranged in the filter element 234, an inorganic ceramic composite film layer is arranged close to each filtering channel 239, and the stainless steel shell 235 and the inorganic ceramic composite film layer jointly adsorb and intercept macromolecular organic matters in the oxidized water.

So arranged, the inorganic ceramic composite film layer is the existing material, takes porous ceramic as a carrier supporting body and is made of TiO₂After inorganic materials are uniformly mixed with additives for reaction and molding, the mixture is calcined at high temperature to form a solid film which has good mechanical strength and good thermal stability, and a boron-doped diamond film is deposited on the surface of the solid microporous ceramic film, so that the inorganic film is conductive, and the processes of film filtration and electrocatalytic oxidation are completed.

The average aperture of the inorganic ceramic composite membrane is 1-10 mu m, and the inorganic ceramic composite membrane can adsorb and retain macromolecular organic matters, bacteria and other substances in water on the composite membrane electrode, the boron-doped diamond membrane in the composite membrane electrode can electrolyze water to generate hydroxyl free radicals (OH), and the OH can non-selectively oxidize various substances such as the organic matters and the like retained on the composite membrane, so that the effect of self-cleaning the membrane is achieved, the composite membrane electrode keeps higher membrane flux, and the service life of the composite membrane electrode is prolonged.

In this embodiment, referring to fig. 3~4, an inorganic ceramic composite film layer, a transition layer and a support layer are sequentially disposed next to the filtering channel 239, the inorganic ceramic composite film layer of the filter element 234 includes an inorganic ceramic film and a boron-doped diamond film loaded on the inorganic ceramic film, and the transition layer and the support layer are made of one or more of titanium oxide, silicon oxide and silicon carbide.

The supporting layer is used for ensuring the mechanical strength of the inorganic ceramic membrane, and the transition layer is arranged between the supporting layer and the inorganic ceramic membrane and prevents particles from permeating into the supporting layer in the preparation process of the membrane. The thickness of the inorganic ceramic composite film layer is 50 to 60 mu m, the thickness of the transition layer is 10 to 100 mu m, and the thickness of the support layer is 200 to 500 mu m.

Further, the inorganic ceramic composite film layer comprises an inorganic ceramic film and a boron-doped diamond film loaded on the inorganic ceramic film, wherein the boron-doped diamond film is taken as an anode, and the stainless steel shell 235 in the electro-oxidation film filtering chamber 23 is taken as a cathode.

In one embodiment of this embodiment, the filter element 234 is connected to the upper cover 233, the upper cover 233 is disposed at one end of the stainless steel shell 235 after the filter element 234 is inserted into the stainless steel shell 235, and the sealing member 238 is disposed between the filter element 234 and the stainless steel shell 235. The sealing member 238 may be a sealing ring or the like to seal the water from contaminants after the water enters the filter element 234, and to prevent back mixing of the concentrated water and the purified water.

In one embodiment of this embodiment, the heating chamber and the warming chamber are both provided with an exhaust pipe 26, the bottom of the heating chamber and the warming chamber are both provided with a blowoff valve 28, the stainless steel casing 235 is further communicated with a concentrated water pipe 237, and the concentrated water pipe 237 penetrates through the stainless steel casing 235 and then is wound on the first water inlet pipe 27 and penetrates out of the casing 10.

In this embodiment, after the inorganic ceramic composite membrane treatment, water with a large amount of pollutants and impurities needs to be discharged through the concentrate pipe 237. The material of concentrated water pipe 237 is the copper pipe that the thermal conductivity is good, is the heliciform winding with the copper pipe on first inlet tube 27, can preheat the water of advancing in the first water pipe.

Specifically, a controller 29 is disposed in the housing 10 below the water tank 20, and the controller 29 is connected to the heater 22 through a wire 244. The controller 29 can be a microcomputer controller 29, which contains a single chip microcomputer, and is a conventional device in the field, and can transmit signals of the sensor and control heating and water inlet through a predetermined program.

Specifically, the water tank 20 is provided with a sensor assembly 24, the sensor assembly 24 includes a first sensor 241 for detecting temperature, a second sensor 242 for detecting water level, and a third sensor 243, and the sensor assembly 24 is connected to the controller 29 through a wire 244.

Further, a solenoid valve 271 for controlling water inflow is disposed on the first water inlet pipe 27, and the solenoid valve 271 is connected to the controller 29 through a wire 244.

Specifically, the housing 10 is provided with a main switch 14, an electrode switch 15, a display screen 16 and a plurality of indicator lights. The indicator light may be a first indicator light 17, i.e. a power indicator light (red); a second indicator light 18, i.e., an electrode indicator light (green); a third indicator light 19, namely a heating indicator light (red).

Referring to the control circuit diagram of the electric heating water boiler shown in fig. 6, one end of the wire 244 is connected to the main switch 14S of the electric heating water boiler and the power indicator HL1, and when the electric heating water boiler is powered on and starts to work, the power indicator HL1 lights up in red; the electrode SA is connected with the temperature sensors BH1 and BH2, the high water level sensors BL1 and BL3 and the low water level sensors BL2 and BL4 in parallel. The temperature sensor BH1 of the heating chamber transfers the water temperature to the microcomputer controller 29, when the temperature is lower than 100 ℃, the heater 22EH1 works, and the heating indicator lamp HL3 lights a red light; the temperature sensor BH2 of the heat preservation chamber transfers the water temperature to the microcomputer control chamber, and when the temperature is lower than 100 ℃, the heater 22EH2 works; the high water level sensors BL1 and BL3 or the low water level sensors BL2 and BL4 detect the water level in the water tank 20, transmit signals to the controller 29 and control the opening and closing of the water inlet electromagnetic valve 271 YV; the water level and water temperature information is displayed on the LCD16 through the controller 29. The water boiling and the water filtering and purifying work in the electro-oxidation film filtering chamber 23 are carried out simultaneously.

The used microcomputer controller is a common ET3 type, and the switches are all single control switches; all the indicator lamps are AD16-22DS indicator lamps; the temperature sensors BH1 and BH2 adopt PTC thermistors; the water level sensors (including high water level sensors BL1, BL3 and low water level sensors BL2, BL 4) all adopt cylindrical electrode type water level monitoring probes, such as stainless steel 304 cylindrical electrodes M12 multiplied by 1.5; the heaters EH1 and EH2 are U-shaped 220V and 3kW thickened stainless steel electric heating pipes; the water inlet electromagnetic valve 271 is a PURO-XD-12 type electromagnetic valve; the liquid crystal display 16 is an LCD1602 display.

The embodiment also provides a method for purifying water treatment, which adopts the above electric heating water boiler, and comprises the steps of filtering and cleaning the water delivered from the heating chamber by using the filter element 234 of the electric oxidation film filter chamber 23, heating the water, and simultaneously, electrically catalyzing the oxidation water to generate hydroxyl radicals for removing refractory organic matters;

specifically, the load capacity of the boron-doped diamond film on the inorganic ceramic film is 8 to 12mg/cm²The oxygen evolution potential of the boron-doped diamond film is 2.8V.

The inorganic ceramic composite membrane can simultaneously intercept and oxidize macromolecular organic matters in water to achieve the self-cleaning effect, the electrode membrane flux can be kept at a higher level, and the service life is longer. The structure for removing the refractory organic matters by generating the hydroxyl radicals through electrocatalytic oxidation is simple, and compared with other electrode materials, more hydroxyl radicals can be generated on the surface of a boron-doped diamond film (BDD), so that the refractory organic matters in drinking water and on the surface of the BDD are more thoroughly removed, and meanwhile, the reaction rate of the hydroxyl radicals and the refractory organic matters is higher in the high-temperature heating process. No additional oxidant is needed, the method is green and environment-friendly, the automation control is easy, and no secondary pollution is generated.

Example 2:

in this example, a simulation test was conducted in a laboratory using the electric water boiler of example 1. The membrane flux of the inorganic ceramic composite membrane electrode is 30L/m²Under the condition of h, the boron-doped diamond film is taken as an anode, the stainless steel shell 235 is taken as a cathode, 200mL of tap water from Xian city is taken as raw water, the device is used for processing and purifying, and the total organic carbon TO can be used as the organic matter content in the water which can represent the high-quality degree of the tap waterC represents the treatment effect of the apparatus by comparing the Total Organic Carbon (TOC) values in water before and after the treatment.

This example studies the oxidation efficiency of the self-cleaning electrode film to TOC in water at high temperature:

the experimental result shows that the membrane flux of the inorganic ceramic composite membrane electrode is 30L/m²h. Current density 10mA/cm²Under the condition of continuous degradation for 20min at the water temperature of 90 ℃, the common degradation efficiency of the electric heating water boiler to TOC reaches 32% (as shown in figure 7). Meanwhile, the conversion of organic matter components in drinking water is analyzed by a three-dimensional fluorescence spectrometer, and the result shows that compared with raw water, after 20min of electrooxidation degradation, the fluorescence peak of organic matter in water moves to a shorter wavelength, the height of the absorption peak is obviously reduced, and the organic matter components and the content of humic acid, fulvic acid and the like are obviously reduced by combining the change of TOC concentration (as shown in figure 8). In actual conditions, because the water supply source is different, the water quality conditions of the tap water treated by the water plant are also different, in this embodiment, three water quality conditions of the tap water, namely conductivity (fig. 9), alkalinity (fig. 10) and hardness (fig. 11), are simulated, and the oxidation efficiency of the device on the TOC in the tap water under the conditions of different conductivities, hardnesses and alkalities is compared.

Experimental results show that the conductivity has a certain influence on the TOC degradation rate in the drinking water, the total degradation rate of the drinking water is gradually increased within the range of 200-500 mu s/cm, the conductivity is within the range of 500-800 mu s/cm, and the total degradation rates of the drinking water are almost the same (32.6% and 32.7%) within 20min, which indicates that the conductivity of the drinking water is favorable for electrooxidation to reduce the TOC concentration in the water within a certain range, but the TOC degradation rate is not greatly influenced if the conductivity is too high. Under each conductivity gradient, the degradation curve trends of TOC are basically consistent, the degradation rates of 0 to 5mintoc are fastest, and the degradation trends of 5 to 20mintoc are gentle, which may be related to the too low TOC concentration (as shown in fig. 9).

HCO in drinking water₃ ^-、OH^-The concentration of ions affects the total alkalinity, HCO, of drinking water₃ ^-、OH^-The higher the ion concentrationHigh total alkalinity, GB5749-2006 stipulates that the total alkalinity of drinking water is less than or equal to 0-250mg/L (as CaCO)₃Meter). Electro-oxidation TOC removal efficiency with HCO₃ ^-The final degradation rate of TOC decreased with increasing concentration and increasing alkalinity (as in table 1). The total alkalinity is 50-200 mg/L (as CaCO)₃Meter), the total degradation rate decreases gradually over 20 min. This may be due to the fact that the higher the alkalinity of the drinking water, the higher the HCO₃ ^-、OH^-The higher the concentration is, the pH is gradually increased, and OH generated in the reaction system is decomposed under the alkaline condition, so that the indirect oxidation capability of the electrode on organic matters is reduced; on the other hand, the alkalinity is too high, scale can be generated in the heating process of drinking water, and part of the generated scale can be adsorbed on the surface of an electrode, so that the direct oxidation of organic matters on the surface of an electrode plate is directly influenced, and the TOC degradation rate is reduced. Under each total alkalinity gradient, the degradation curve trend of TOC is basically consistent, the degradation rate of 0 to 5minTOC is fastest, and the degradation trend of 5 to 20minTOC is gentle. The more the alkalinity of drinking water is, the lower the efficiency of electrooxidation degradation of TOC is, and the final degradation rate is about 30 percent, as shown in figure 10.

TABLE 1 addition of HCO₃ ^-Concentration to alkalinity relationship

The TOC removal efficiency by electrooxidation is accompanied by Ca²⁺、Mg²⁺The concentration is gradually increased, the hardness is gradually increased (as shown in table 2), and the total hardness of drinking water has certain influence on the degradation rate of the electro-oxidation TOC. The total hardness is 100-300 mg/L (as CaCO)₃Calculated by CaCO), the total degradation rate is gradually reduced within 20min, and the total hardness is 100 mg/L₃Calculated by CaCO), the final degradation rate can reach 30 percent, and the total hardness is 300 mg/L₃Measured), the final degradation rate is reduced to about 20 percent, and the difference value of the final degradation rates is about 10 percent. On the one hand, this may be due to the fact that, due to the excessive hardness, the drinking water may generate scale during the heating process, and a part of the generated scale may be adsorbed on the surface of the electrode,directly influences the direct oxidation of organic matters on the surface of the electrode and the mass transfer efficiency between the electrodes, and leads the TOC degradation rate to be reduced. Under each total hardness gradient, the degradation curve trend of TOC is basically consistent, the degradation rate of 0 to 5minTOC is fastest, and the degradation trend of 5 to 20minTOC is gentle. As shown in fig. 11.

TABLE 2 addition of Ca²⁺、Mg²⁺Concentration to hardness relationship

The electric heating boiled water tank can effectively intercept and oxidize to remove organic matters difficult to degrade, remove a series of potential problems of odor, bacteria and the like in tap water, improve the quality of drinking water and avoid the bad drinking experience of people on the drinking water. The inorganic ceramic composite membrane electrode in the electric heating water boiling tank can simultaneously intercept and oxidize macromolecular organic matters in water, so that the self-cleaning effect is achieved, the flux of the membrane electrode can be kept at a higher level, and the service life is longer.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An electric heating water boiler comprises a hollow shell (10), and is characterized in that a water tank (20) is arranged in the shell (10), a heater (22) is arranged at the bottom in the water tank (20), a first water inlet pipe (27) is communicated with the bottom of the water tank (20), the water tank (20) is divided into a heating chamber and a heat preservation chamber, and a water tap (25) for water outlet is communicated with the heat preservation chamber;

an electro-oxidation film filtering chamber (23) used for treating water conveyed in the heating chamber is arranged in the heat preservation chamber, the electro-oxidation film filtering chamber (23) is communicated with the heating chamber through a second water inlet pipe (231), a booster pump (232) is arranged on the second water inlet pipe (231), a stainless steel shell (235) is arranged in the electro-oxidation film filtering chamber (23), a filter element (234) is arranged in the stainless steel shell (235), a water outlet pipe (236) is arranged in the stainless steel shell (235) in a communicating manner, and purified water treated by the filter element (234) is conveyed to the bottom of the heat preservation chamber by the water outlet pipe (236);

set up a plurality of filtration passageways (239) in filter core (234), hug closely every filtration passageway (239) sets up inorganic ceramic composite film layer, stainless steel casing (235) with inorganic ceramic composite film layer adsorbs jointly and intercepts the macromolecule organic matter in the oxidation aquatic.

2. An electric heating water boiler according to claim 1, wherein an inorganic ceramic composite film layer, a transition layer and a support layer are sequentially arranged close to the filtering channel (239), the thickness of the inorganic ceramic composite film layer is 50-60 μm, the thickness of the transition layer is 10-100 μm, and the thickness of the support layer is 200-500 μm.

3. An electrically heated water boiler as claimed in claim 1 wherein the inorganic ceramic composite membrane layer comprises an inorganic ceramic membrane and a boron doped diamond membrane supported on the inorganic ceramic membrane, the boron doped diamond membrane being an anode and the stainless steel housing (235) within the electro-oxidation membrane filtration chamber (23) being a cathode.

4. An electric water boiler according to claim 1, characterized in that the filter element (234) is connected with an upper cover (233), the upper cover (233) is positioned at one end of the stainless steel casing (235) after the filter element (234) is inserted into the stainless steel casing (235), and a sealing member (238) is arranged between the filter element (234) and the stainless steel casing (235).

5. An electric water boiler according to claim 1, wherein the heating chamber and the warming chamber are provided with exhaust pipes (26) respectively, the bottom parts of the heating chamber and the warming chamber are provided with drain valves (28), the stainless steel shell (235) is further communicated with a concentrated water pipe (237), and the concentrated water pipe (237) penetrates out of the stainless steel shell (235), then is wound on the first water inlet pipe (27), and penetrates out of the outer shell (10).

6. An electrically heated water boiler as claimed in claim 1, wherein a controller (29) is provided within the housing (10) below the water tank (20), the controller (29) being connected to the heater (22) by a lead (244).

7. An electrically heated water boiler as claimed in claim 6, wherein a sensor assembly (24) is provided on the water tank (20), the sensor assembly (24) comprising a first sensor (241) for sensing temperature, a second sensor (242) and a third sensor (243) for sensing water level, the sensor assembly (24) being connected to the controller (29) by a conductor (244).

8. An electric water boiler according to claim 6, characterized in that the first water inlet pipe (27) is provided with a solenoid valve (271) for controlling water inlet, and the solenoid valve (271) is connected with the controller (29) through a lead (244).

9. An electrically heated water boiler as claimed in claim 4, characterized in that the housing (10) is provided with a master switch (14), an electrode switch (15), a display screen (16) and a plurality of indicator lights.

10. A water treatment purification method, characterized in that the electric heating water boiler of claim 3 is adopted, and comprises the steps of filtering and cleaning the water conveyed from the heating chamber by using a filter element (234) of the electric oxidation film filter chamber (23), heating the water, and simultaneously performing electric catalytic oxidation on the water to generate hydroxyl radicals for removing refractory organics;

the load capacity of the boron-doped diamond film on the inorganic ceramic film is 8 to 12mg/cm²The oxygen evolution potential of the boron-doped diamond film is 2.8V.

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