Ceramic ultrafiltration membrane, ceramic nanofiltration membrane integrated water purification device and method

Abstract

The invention discloses a ceramic ultrafiltration membrane, and a ceramic nanofiltration membrane integrated water purification device and method. The water purification device comprises a water inlet, a front activated carbon filter, a ceramic ultrafiltration membrane assembly, a ceramic nanofiltration membrane assembly, a disinfection device and a water outlet which are connected in sequence. After water to be treated is obtained through the water inlet, the water to be treated is sequentially conveyed to the front activated carbon filter, the ceramic ultrafiltration membrane, the ceramic nanofiltration membrane and the disinfection device for filtration and disinfection treatment and then is output through the water outlet, so that safe and effective filtration of the water is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of drinking water purification, and in particular to a ceramic ultrafiltration membrane and a ceramic nanofiltration membrane integrated water purification device and method. Background Art

[0002] At present, water plants mostly use deep treatment processes to treat drinking water, and the water supply quality has been greatly improved. At the same time, with the implementation of the "Standards for Drinking Water Hygiene" (GB5749-2022) and local standards, the water quality standards of water plants are higher. However, there are problems with improper maintenance and cleaning of my country's municipal water supply system, which leads to secondary pollution in the process of transporting tap water from the water plant to residents' homes through long-distance pipelines. In addition, the pollution problems of secondary water supply tanks, water storage tanks and household pipes also affect the direct drinking of tap water. Usually, a water purifier is required to treat the tap water entering the household to meet the requirements of direct drinking.

[0003] However, traditional water purifiers mostly use multi-stage filtration systems including organic nanofiltration or reverse osmosis, which not only increases the water purification process, but also intercepts beneficial minerals in the water, making it unsuitable for long-term drinking. In addition, there is a risk of microplastics dissolving during long-term use of organic membranes. Therefore, it is imperative to develop a tap water purification device with a short process flow, remove organic matter, retain beneficial minerals, and effectively reduce the production of plastics. Summary of the invention

[0004] The present invention provides a ceramic ultrafiltration membrane, ceramic nanofiltration membrane integrated water purification device and method, so as to solve the problem that the prior art cannot achieve safe and effective filtration of water.

[0005] In a first aspect, the present invention provides a ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device, comprising: a water inlet (faucet water), a pre-activated carbon filter, a ceramic ultrafiltration membrane assembly, a ceramic nanofiltration membrane assembly, a disinfection device and a water outlet connected in sequence; wherein,

[0006] A first pump is provided on the pipeline between the ceramic ultrafiltration membrane assembly and the ceramic nanofiltration membrane assembly;

[0007] The pre-activated carbon filter, the ceramic ultrafiltration membrane assembly and the ceramic nanofiltration membrane assembly are each connected to the wastewater outlet through an independent valve;

[0008] Among them, there are one or at least two pre-activated carbon filters. When there are at least two pre-activated carbon filters, multiple pre-activated carbon filters are connected in parallel; there are one or at least two ceramic ultrafiltration membrane components. When there are at least two ceramic ultrafiltration membrane components, multiple ceramic ultrafiltration membrane components are connected in parallel; there are one or at least two ceramic nanofiltration membrane components. When there are at least two ceramic nanofiltration membrane components, multiple ceramic nanofiltration membrane components are connected in parallel.

[0009] In a preferred embodiment, the activated carbon in the pre-activated carbon filter is made of one or more of fruit shell, coconut shell, granular, columnar, powdered and honeycomb activated carbon.

[0010] More preferably, the pre-activated carbon filter is automatically flushed every 2 to 7 days, including forward flushing and back flushing, and each forward flushing or back flushing time is 10 to 30 minutes.

[0011] More preferably, the activated carbon specific surface area of ​​the pre-activated carbon filter is 1000 to 4000 m 2 / g.

[0012] In a preferred embodiment, the shell of the ceramic ultrafiltration membrane assembly is 304 stainless steel or 316 stainless steel, the ceramic ultrafiltration membrane material is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 20 to 100 nm.

[0013] More preferably, the ceramic ultrafiltration membrane assembly is automatically flushed every 1 to 8 hours, and each flushing time is 10 to 60 seconds.

[0014] In a preferred embodiment, the shell of the ceramic nanofiltration membrane assembly is 304 or 316 food grade stainless steel, the ceramic membrane material is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 2 to 15 nm.

[0015] More preferably, the ceramic nanofiltration membrane assembly has a designed water production flow rate of 1 to 3 L / min and a water inlet pressure of 0.3 to 0.7 MPa.

[0016] More preferably, the ratio of produced water to wastewater of the ceramic nanofiltration membrane assembly is between 3:1 and 1:1, and forward flushing is performed every 8 to 12 hours, with each forward flushing time being 10 to 60 seconds.

[0017] In a preferred embodiment, the disinfection device is an ultraviolet lamp (UV LED).

[0018] In a second aspect, a water purification method based on a ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to the first aspect of the present invention specifically comprises the following steps:

[0019] The water to be treated is obtained from the water inlet and sent to the pre-activated carbon filter for the first filtration to form the first filtered water;

[0020] The water after the first filtration is sent to the ceramic ultrafiltration membrane assembly to form the water after the second filtration;

[0021] The water after the second filtration is sent to the ceramic nanofiltration membrane assembly to form the water after the third filtration;

[0022] The water after the third filtration is sent to the disinfection device for disinfection, and the disinfected water is output through the water outlet.

[0023] Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages:

[0024] The present invention provides a ceramic ultrafiltration membrane, ceramic nanofiltration membrane integrated water purification device and method, which solves the problem that the prior art cannot achieve safe and effective filtration of water. It has the following advantages: (1) Compared with the traditional water purification equipment with organic membrane as the core, the ceramic ultrafiltration membrane and the ceramic nanofiltration membrane are coupled to shorten the water purification process, extend the service life of the equipment, and reduce the risk of microplastic dissolution; (2) Compared with the traditional organic ultrafiltration membrane, under the same water inlet pressure, the ceramic ultrafiltration membrane has a larger flux, is more convenient to clean, and is more green and safe to use; (3) Compared with the traditional organic nanofiltration membrane, the ceramic nanofiltration membrane can effectively retain beneficial minerals while reducing the organic matter in the water inlet, which is more conducive to the realization of healthy drinking water for residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0026] Figure 1 It is a structural diagram of a ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to a preferred embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the distribution of ceramic membranes of a ceramic ultrafiltration membrane or ceramic nanofiltration membrane assembly in a preferred embodiment of the present invention.

[0028] Figure 3 This is a diagram showing the removal effect of organic matter by the integrated water purification device in the preferred embodiment of the present invention.

[0029] Figure 4 This is a diagram showing the conductivity removal effect of the integrated water purification device in the preferred embodiment of the present invention.

[0030] Figure 1 The reference numerals in the figures are described as follows:

[0031] 1. Water inlet; 2. Pre-activated carbon filter; 3. Ceramic ultrafiltration membrane assembly; 4. Ceramic nanofiltration membrane assembly; 5. Disinfection device; 6. Water outlet; 7. First pump; 8. Wastewater outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Embodiment 1:

[0037] This embodiment combines Figure 1, a ceramic ultrafiltration membrane, ceramic nanofiltration membrane integrated water purification device according to the present invention is described. In this embodiment, the ceramic ultrafiltration membrane, ceramic nanofiltration membrane integrated purification device is used to purify tap water, comprising: a water inlet 1, a pre-activated carbon filter 2, a ceramic ultrafiltration membrane assembly 3, a ceramic nanofiltration membrane assembly 4 ( Figure 2 Shown is a schematic diagram of the distribution of a ceramic ultrafiltration membrane or a ceramic nanofiltration membrane assembly, a disinfection device 5 and a water outlet 6.

[0038] In this embodiment, the pipeline between the pre-activated carbon filter 2 and the ceramic ultrafiltration membrane assembly 3 is directly filtered by the household tap water pressure; a first pump 7 is provided on the pipeline between the ceramic ultrafiltration membrane assembly 3 and the ceramic nanofiltration membrane assembly 4 (in this embodiment, the first pump 7 is a booster pump); the pre-activated carbon filter 2, the ceramic ultrafiltration membrane assembly 3 and the ceramic nanofiltration membrane assembly 4 are each connected to the wastewater outlet 8 through an independent valve.

[0039] Among them, the pre-activated carbon filter 2 is one or at least two. When the pre-activated carbon filters 2 are at least two, multiple pre-activated carbon filters 2 are connected in parallel (in the present embodiment, the pre-activated carbon filter 2 is one); the ceramic ultrafiltration membrane assembly 3 is one or at least two. When the ceramic ultrafiltration membrane assembly 3 is at least two, multiple ceramic ultrafiltration membrane assemblies 3 are connected in parallel (in the present embodiment, the ceramic ultrafiltration membrane assembly 3 is one); the ceramic nanofiltration membrane assembly 4 is one or at least two. When the ceramic nanofiltration membrane assembly 4 is at least two, multiple ceramic nanofiltration membrane assemblies 4 are connected in parallel (in the present embodiment, the ceramic nanofiltration membrane assembly 4 is two).

[0040] In this embodiment, the activated carbon in the pre-activated carbon filter 2 is made of one or more of fruit shell, coconut shell, granular, columnar, powdered and honeycomb activated carbon; the pre-activated carbon filter 2 is automatically flushed every 2 to 7 days, including forward flushing and back flushing, and each forward flushing or back flushing time is 10 to 30 minutes; wherein the activated carbon specific surface area of ​​the pre-activated carbon filter 2 is 1000 to 4000 m 2 / g.

[0041] In this embodiment, the shell of the ceramic ultrafiltration membrane assembly 3 is 304 stainless steel or 316 stainless steel, the material of the ceramic ultrafiltration membrane is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 20 to 100 nm; the ceramic ultrafiltration membrane assembly 3 is automatically flushed every 1 to 8 hours, and the time for each flushing is 10 to 60 seconds.

[0042] In this embodiment, the shell of the ceramic nanofiltration membrane assembly 4 is 304 or 316 food grade stainless steel, the ceramic membrane material is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 2 to 15 nm; the designed water production flow rate of the ceramic nanofiltration membrane assembly 4 is 1 to 3 L / min, and the water inlet pressure is 0.3 to 0.7 MPa; the ratio of produced water to wastewater of the ceramic nanofiltration membrane assembly 4 is between 3:1 and 1:1, and positive flushing is performed every 8 to 12 hours, and each positive flushing time is 10 to 60 seconds.

[0043] In this embodiment, the disinfection device 5 is an ultraviolet lamp (UV LED).

[0044] Working principle: tap water enters the pre-activated carbon filter 2 through the water inlet 1, and the residual chlorine in the water is removed by the pre-activated carbon filter 2. The water filtered out of the pre-activated carbon filter 2 is sent to the ceramic ultrafiltration membrane assembly 3 for further pretreatment by the tap water pressure, and the activated carbon powder is intercepted. Then, the water filtered out of the ceramic ultrafiltration membrane assembly 3 is sent to two parallel ceramic nanofiltration membrane assemblies 4 by the first pump 7, and finally, the water obtained by the ceramic nanofiltration membrane assembly 4 is disinfected and sent to the water outlet 6. In this process, the wastewater generated by the pre-activated carbon filter 2, the ceramic ultrafiltration membrane assembly 3 and the ceramic nanofiltration membrane assembly 4 in the water purification process is transmitted to the wastewater outlet 8 through the pipeline, and the wastewater is discharged through the wastewater outlet 8.

[0045] The water purification method based on the ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device described in this embodiment specifically includes the following steps:

[0046] The water to be treated is obtained from the water inlet 1 and sent to the pre-activated carbon filter 2 for the first filtration to form the first filtered water;

[0047] The water after the first filtration is sent to the ceramic ultrafiltration membrane assembly 3 to form the water after the second filtration;

[0048] The water after the second filtration is sent to the ceramic nanofiltration membrane assembly 4 to form the water after the third filtration;

[0049] The water after the third filtration is sent to the disinfection device 5 for disinfection, and the disinfected water is output through the water outlet 6.

[0050] Embodiment 2:

[0051] In this embodiment, household tap water is used as the water inlet of the device, and water is purified by a water purification device of a ceramic ultrafiltration membrane and a ceramic nanofiltration membrane integrated water purification device described in the present invention. The results are as follows: Figure 2-Figure 3As shown, the inlet turbidity is 0.04-0.18 NTU, TOC (Total Organic Carbon, which indicates the total amount of carbon elements bound to organic matter in water or other media. TOC measures the concentration of all organic compounds in terms of carbon and is used to evaluate water quality) is 2-3 mg / L, UV 254 (UV254 refers to the ultraviolet absorbance measured at a wavelength of 254 nanometers (nm), which is used to indicate the presence and concentration of organic matter in water) is 0.01 to 0.035 cm -1 , the conductivity is 550~690μS / cm. The activated carbon in the pre-activated carbon filter 2 is made of fruit shell, the ceramic ultrafiltration membrane in the ceramic ultrafiltration membrane assembly 3 is made of alumina, with a pore size of 30~80nm, and the water inlet pressure is the tap water pressure (1.5~3.5bar). The ceramic nanofiltration membrane in the ceramic nanofiltration membrane assembly 4 is made of alumina, with a pore size of 5~10nm, a design flow rate of 1.5~3L / min, a water inlet pressure of 0.3~0.7MPa, and a ratio of produced water to wastewater of 2 to 1. The water filtered through the ceramic nanofiltration membrane is sterilized by UV and can be used for drinking. The results show that the effluent turbidity is lower than 0.03NTU, the TOC removal rate is 25~40%, and the UV 254 The removal rate is 30-70%, and the conductivity removal rate is less than 10%.

[0052] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device, characterized in that: include: The water inlet, the pre-activated carbon filter, the ceramic ultrafiltration membrane assembly, the ceramic nanofiltration membrane assembly, the disinfection device and the water outlet are connected in sequence; wherein, A first pump is provided on the pipeline between the ceramic ultrafiltration membrane assembly and the ceramic nanofiltration membrane assembly; The pre-activated carbon filter, the ceramic ultrafiltration membrane assembly and the ceramic nanofiltration membrane assembly are each connected to the wastewater outlet through an independent valve; Among them, there are one or at least two pre-activated carbon filters. When there are at least two pre-activated carbon filters, multiple pre-activated carbon filters are connected in parallel; there are one or at least two ceramic ultrafiltration membrane assemblies. When there are at least two ceramic ultrafiltration membrane assemblies, multiple ceramic ultrafiltration membrane assemblies are connected in parallel; there are one or at least two ceramic nanofiltration membrane assemblies. When there are at least two ceramic nanofiltration membrane assemblies, multiple ceramic nanofiltration membrane assemblies are connected in parallel.

2. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1, characterized in that: The activated carbon in the pre-activated carbon filter is made of one or more of fruit shell, coconut shell, granular, columnar, powdered and honeycomb activated carbon.

3. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1 or 2, characterized in that: The pre-activated carbon filter is automatically flushed every 2 to 7 days, including forward flushing and back flushing, and each forward flushing or back flushing time is 10 to 30 minutes; wherein the activated carbon specific surface area of ​​the pre-activated carbon filter is 1000 to 4000 m 2 / g.

4. The ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1, characterized in that: The shell of the ceramic ultrafiltration membrane assembly is 304 stainless steel or 316 stainless steel, the material of the ceramic ultrafiltration membrane is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 20-100 nm.

5. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1 or 4, characterized in that: The ceramic ultrafiltration membrane assembly is automatically flushed every 1 to 8 hours, and each flushing time is 10 to 60 seconds.

6. The ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1, characterized in that: The shell of the ceramic nanofiltration membrane assembly is 304 or 316 food grade stainless steel, the ceramic membrane material is one or more of aluminum oxide, silicon carbide, titanium oxide, silicon oxide and zirconium oxide, and the pore size is 2 to 15 nm.

7. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1 or 6, characterized in that: The ceramic nanofiltration membrane assembly has a designed water production flow rate of 1 to 3 L / min and a water inlet pressure of 0.3 to 0.7 MPa.

8. A ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1 or 6, characterized in that: The ratio of produced water to wastewater of the ceramic nanofiltration membrane assembly is between 3:1 and 1:1, and positive flushing is performed every 8 to 12 hours, with each positive flushing time being 10 to 60 seconds.

9. The ceramic ultrafiltration membrane and ceramic nanofiltration membrane integrated water purification device according to claim 1, characterized in that: The disinfection device is an ultraviolet lamp.

10. A method for purifying water using the integrated water purification device according to claim 1, characterized in that: The steps include: The water to be treated is obtained from the water inlet and sent to the pre-activated carbon filter for the first filtration to form the first filtered water; The water after the first filtration is sent to the ceramic ultrafiltration membrane assembly to form the water after the second filtration; The water after the second filtration is sent to the ceramic nanofiltration membrane assembly to form the water after the third filtration; The water after the third filtration is sent to the disinfection device for disinfection, and the disinfected water is output through the water outlet.

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