Inorganic ceramic membrane components

Abstract

The present invention discloses an inorganic ceramic membrane assembly, including a filter cartridge, an upper end cover located at the upper end of the filter cartridge, and a lower end cover located at the lower end of the filter cartridge, a liquid inlet is provided on the side of the lower end of the filter cartridge, a liquid outlet is provided on the side of the upper end of the filter cartridge, a water production port is provided on the upper end cover, and a sewage outlet is provided on the lower end cover, the filter cartridge is a cylinder, an inorganic ceramic membrane element is arranged in the filter cartridge, the inorganic ceramic membrane element includes a flat membrane group located in the middle position and an arc-shaped membrane located on the side of the flat membrane group, and the length extension direction of the flat membrane group and the arc-shaped membrane is the same as the extension direction of the filter cartridge. The inorganic ceramic membrane assembly of the present invention can be used to apply plate-type ceramic membranes to ultrafiltration systems, making full use of the advantages of ceramic membranes to achieve low-cost, large-area replacement of existing hollow fiber membrane assemblies, thereby achieving the purpose of improving system stability, reducing operating costs, and extending the operating life of equipment.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a combined inorganic flat ceramic ultrafiltration membrane component capable of replacing an organic fiber membrane. Background Art

[0002] At present, the most commonly used ultrafiltration membrane elements on the market are organic hollow fiber membranes. Due to the limitations of the material, they are subject to certain restrictions in terms of pH range, temperature and service life when processing materials. In actual use, they require strict pretreatment and are difficult to clean, are greatly affected by temperature, have high operating energy consumption, and the membrane fibers are easy to break. These common problems have restricted the development of the organic membrane product market.

[0003] Inorganic ceramic membrane is a new type of high-efficiency porous membrane. It uses inorganic materials such as aluminum oxide, zirconium oxide, titanium oxide and silicon oxide to make a porous support body, and then prepares a functional membrane layer through a surface coating process, and finally is fired at high temperature. It has an asymmetrically distributed porous structure. Under pressure, the raw material liquid flows inside or outside the membrane tube, small molecules (or liquids) pass through the membrane, and large molecules (or solids) are intercepted by the membrane to achieve separation, concentration, purification and other purposes. Compared with organic membranes, it has the advantages of high temperature resistance, chemical corrosion resistance, good mechanical strength, strong antimicrobial ability, large permeation flux, strong cleanability, narrow pore size distribution, and long service life. It is precisely because of its unique material properties and advanced process performance that it presents an excellent industry competitive advantage, which has made the development of ceramic membranes very rapid in recent years, and has been continuously expanded in the fields of wastewater treatment, sewage treatment, and seawater desalination. However, there is currently a lack of an inorganic ceramic membrane component that can directly replace the organic fiber membrane component on the market. This is very difficult for users who have product upgrade needs and have high requirements for construction period, site, and cost to upgrade and transform.

[0004] At present, mature inorganic ceramic membrane products on the market mainly have two structures: tubular and plate. Tubular ceramic membranes are mainly used in the fine chemical industry, with small pores and low packing density. Large-diameter tubular ceramic membranes have low yields due to their sintering process characteristics, which leads to high costs and cannot be used in large-scale industrial applications. Plate ceramic membranes are easier to shape, have a high yield and low cost than tubular ones. They are currently widely used in MBR (Membrane Bio-Reactor) processes, but due to their flat characteristics and the need for a membrane pool structure in existing process designs.

[0005] Since the inorganic ceramic membrane product structure is relatively simple and incompatible with the organic membrane components that have been put into operation, it causes problems such as long upgrading and transformation cycle and high cost, which greatly limits the application market of inorganic ceramic membrane replacing organic fiber membrane. Therefore, it is urgent to develop a barrel-type flat ceramic membrane component structure, which does not need to replace the original frame and piping system, directly replaces the organic membrane component, minimizes the upgrading and transformation cost, and achieves optimal operation. Summary of the invention

[0006] In view of this, in order to overcome the defects of the prior art and achieve the above-mentioned purpose, an object of the present invention is to provide an inorganic ceramic membrane component that can directly replace the organic fiber membrane component.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An inorganic ceramic membrane assembly comprises a filter cartridge, an upper end cover located at the upper end of the filter cartridge, and a lower end cover located at the lower end of the filter cartridge, a liquid inlet is provided on the side of the lower end of the filter cartridge, a liquid outlet is provided on the side of the upper end of the filter cartridge, a water outlet is provided on the upper end cover, and a sewage outlet is provided on the lower end cover, the filter cartridge is a cylinder, an inorganic ceramic membrane element is arranged in the filter cartridge, the inorganic ceramic membrane element comprises a flat membrane group located in the middle position and an arc-shaped membrane located on the side of the flat membrane group, and the length extension direction of the flat membrane group and the arc-shaped membrane is the same as the extension direction of the filter cartridge. The liquid inlet and the liquid outlet are located on the same side of the filter cartridge, the water outlet is connected to the channel in the membrane, and the liquid inlet and the liquid outlet are connected to the outside of the membrane and between the filter cartridge.

[0009] Preferably, the flat diaphragm group includes a plurality of flat diaphragms, which are superimposed and bonded to each other along the thickness direction of the flat diaphragms to form the flat diaphragm group, and the cross-sectional width of the flat diaphragm group gradually decreases from the middle to both sides along the thickness direction of the flat diaphragm group.

[0010] More preferably, the arcuate diaphragm includes a planar portion that fits the outermost flat diaphragm in the flat diaphragm group and an arcuate portion that matches the inner wall of the filter cartridge, and the width of the planar portion matches the width of the outermost flat diaphragm.

[0011] Preferably, an aeration device is further provided between the lower end cover and the inorganic ceramic membrane element, the aeration device comprising an air inlet and an air outlet connected to the air inlet, and the air outlets are evenly distributed on the same circumference.

[0012] Preferably, a membrane end cap is provided at the lower end of the inorganic ceramic membrane element, and a fixing mechanism matching the membrane end cap is provided in the filter cartridge, wherein the fixing mechanism comprises a vent hole and a lower buckle for clamping the membrane end cap.

[0013] More preferably, a sealing gasket is provided between the lower buckle and the membrane end cover, and the sealing gasket is provided on the lower surface of the membrane end cover.

[0014] Preferably, a membrane sealing ring is provided at the upper end of the inorganic ceramic membrane element, an upper buckle matching the membrane sealing ring is provided in the filter cartridge, a fixing ring is provided between the upper buckle and the membrane sealing ring, and the fixing ring is sleeved on the outside of the membrane sealing ring.

[0015] More preferably, the membrane sealing ring comprises a top plate having a hollow hole and a side plate for fastening the flat membrane and the arc-shaped membrane together.

[0016] More preferably, an adhesive layer is provided between the bottom end of the inorganic ceramic membrane element and the membrane end cover, and a component of the adhesive layer is an epoxy resin adhesive.

[0017] Preferably, the upper and lower ends of the filter cartridge are provided with external threads, the upper end cover and the lower end cover are provided with internal threads corresponding to the external threads, and the filter cartridge is connected with the upper end cover and the lower end cover through the external threads and the internal threads.

[0018] Due to the adoption of the above technical scheme, compared with the prior art, the benefits of the present invention are: the inorganic ceramic membrane assembly of the present invention has a reasonable structural design. By arranging a flat membrane group and an arc-shaped membrane in the filter cartridge, the inorganic ceramic membrane element forms a shape that matches the filter cartridge, increasing the coverage area of ​​the membrane. By using this assembly, the plate-type ceramic membrane can be used in the ultrafiltration system, making full use of the advantages of the ceramic membrane, and achieving low-cost, large-area replacement of the existing hollow fiber membrane assembly, thereby achieving the purpose of improving system stability, reducing operating costs, and extending the operating life of the equipment. The inorganic ceramic membrane assembly of the present invention is applied to the current organic membrane assembly without replacing the original frame and piping system, shortening the transformation cycle, reducing the transformation cost, and achieving optimal operating performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a cross-sectional schematic diagram of an inorganic ceramic membrane assembly according to an embodiment of the present invention;

[0021] Figure 2 is a schematic cross-sectional view of an inorganic ceramic membrane element according to an embodiment of the present invention;

[0022] Figure 3It is a cross-sectional schematic diagram of a flat diaphragm and a curved diaphragm in an inorganic ceramic membrane element according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the distribution of the gas outlets of the aeration device in the inorganic ceramic membrane assembly according to an embodiment of the present invention;

[0024] Including: filter cartridge-1, upper end cover-2, lower end cover-3, inorganic ceramic membrane element-4, sewage outlet-5, air inlet-6, liquid inlet-7, liquid outlet-8, aeration device-9, air outlet head-91, lower buckle-10, adhesive layer-11, membrane end cover-12, sealing gasket-13, fixing ring-14, upper buckle-15, water outlet-16, membrane sealing ring-17, threaded bayonet-18, arc diaphragm-19, flat diaphragm-20. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0026] See attached Figure 1-4 The inorganic ceramic membrane assembly of this embodiment includes a filter cartridge 1, an upper end cover 2 located at the upper end of the filter cartridge 1, a lower end cover 3 located at the lower end of the filter cartridge 1, an inorganic ceramic membrane element 4 arranged in the filter cartridge 1, and an aeration device 9 arranged between the inorganic ceramic membrane element 4 and the lower end cover 3. A liquid inlet 7 is provided on the side of the lower end of the filter cartridge 1, a liquid outlet 8 is provided on the side of the upper end of the filter cartridge 1, a water outlet 16 is provided at the center of the upper end cover 2, and a sewage outlet 5 is provided at the center of the lower end cover 3. The filter cartridge 1 is a cylinder, and the liquid inlet 7 and the liquid outlet 8 are located on the same side of the filter cartridge 1. The water outlet 16 is connected to the channel in the diaphragm, and the liquid inlet 7 and the liquid outlet 8 are connected to the outside of the diaphragm and between the filter cartridge 1.

[0027] The upper and lower ends of the filter cartridge 1 are provided with external threads, and the upper end cover 2 and the lower end cover 3 are provided with internal threads corresponding to the external threads. The filter cartridge 1 is connected with the upper end cover 2 and the lower end cover 3 through a threaded bayonet 18 formed by the external threads and the internal threads.

[0028] The lower end of the inorganic ceramic membrane element 4 is provided with a membrane end cap 12, and the filter cartridge 1 is provided with a fixing mechanism matching the membrane end cap 12, the fixing mechanism including a vent hole and a lower buckle 10 for clamping the membrane end cap 12. A sealing gasket 13 is provided between the lower buckle 10 and the membrane end cap 12, and the sealing gasket 13 is provided on the lower surface of the membrane end cap 12.

[0029] The upper end of the inorganic ceramic membrane element 4 is provided with a membrane sealing ring 17, which includes a top plate with a hollow hole and a side plate for fastening the flat membrane 20 and the arc-shaped membrane 19 together. An upper buckle 15 matching the membrane sealing ring 17 is provided in the filter cartridge 1, and a fixing ring 14 is provided between the upper buckle 15 and the membrane sealing ring 17, and the fixing ring 14 is sleeved on the outer side of the membrane sealing ring 17.

[0030] There is an adhesive layer 11 between the bottom end of the inorganic ceramic membrane element 4 and the membrane end cap 12, and the adhesive layer 11 is composed of an epoxy resin adhesive, that is, the bottom end of the inorganic ceramic membrane element 4 is sealed with the membrane end cap 12 using an epoxy resin adhesive. In this embodiment, the upper end of the inorganic ceramic membrane element 4 and the membrane sealing ring 17 are also sealed with an epoxy resin adhesive.

[0031] The aeration device 9 includes an air inlet 6 and an air outlet 91 connected to the air inlet 6. The air outlet 91 is evenly distributed on the same circumference. The air inlet 6 is arranged on the side of the lower end cover 3, and its horizontal position is lower than the liquid inlet 7. Figure 4 As shown, the aeration device 9 in this embodiment adopts circular distributed aeration. The bubbles generated by continuous aeration pass through the vent holes of the fixing mechanism at the bottom of the membrane element and act on the surface of the membrane, which helps the pollutants attached to the surface of the membrane to separate from the membrane, thereby extending the membrane cleaning cycle and reducing operating costs.

[0032] The inorganic ceramic membrane element 4 includes a flat diaphragm group located in the middle and an arc diaphragm 19 located on the side of the flat diaphragm group. The length extension direction of the flat diaphragm group and the arc diaphragm 19 is the same as the extension direction of the filter cartridge 1. Among them, the flat diaphragm group includes a plurality of flat diaphragms 20. The plurality of flat diaphragms 20 are bonded to each other along the thickness direction of the flat diaphragm 20 to form a flat diaphragm group. The cross-sectional width of the flat diaphragm 20 gradually decreases from the middle to both sides along the thickness direction of the flat diaphragm group. The arc diaphragm 19 includes a flat portion bonded to the outermost flat diaphragm 20 in the flat diaphragm group and an arc portion matched to the inner wall of the filter cartridge 1. The width of the flat portion matches the width of the outermost flat diaphragm 20. Figure 2 and 3 As shown, the flat membrane in this embodiment is a plurality of 3mm thick ceramic membranes of decreasing size installed in a stacked manner, and in order to adapt to the size of the cylindrical filter barrel and increase the filling amount of the membrane element, arc-shaped ceramic membranes are used at both ends of the inorganic ceramic membrane element 4. In some other embodiments, the ceramic membrane can be split and integrated to adapt to filter cartridges 1 of different sizes, and the thickness of the membrane can also be 4mm or other options.

[0033] The working process of the inorganic ceramic membrane assembly in this embodiment is briefly described below:

[0034] When the inorganic ceramic membrane assembly is operating normally, wastewater enters the filter cartridge 1 from the liquid inlet 7 at the bottom of the filter cartridge 1, is filtered by the ceramic membrane element, and the produced water is collected in the upper end cover 2, and flows out through the liquid outlet 8 at the top of the inorganic ceramic membrane assembly. The filtered concentrated liquid is discharged through the liquid outlet 8 on the upper side of the filter cartridge 1.

[0035] During operation, the aeration device 9 continuously aerates, so that large particles of pollutants in the filter cartridge 1 are not easily attached to the membrane surface and accumulate in the dirt deposition area at the bottom of the aeration device 9. The drain valve is regularly drained by the control system, and the dirt is discharged from the drain port 5 in time.

[0036] As the operation time increases, small particles of pollutants that are difficult to wash off gradually accumulate on the surface of the membrane. When the pressure difference between the inside and outside of the ceramic membrane element reaches a certain level, backwashing is required. During backwashing, backwash water enters from the liquid outlet 8 on the top of the filter cartridge 1, and washes from the inside of the inorganic ceramic membrane element 4 to the outside of the membrane, peeling off the small particles of pollutants on the outside of the membrane and discharging them from the water inlet with the water flow.

[0037] The present invention adopts the following technical scheme: the inorganic ceramic membrane assembly comprises a filter cartridge 1, an air inlet 6 is arranged on the bottom side of the filter cartridge 1, an aeration device 9 is arranged on the bottom of the filter cartridge 1, and dirt on the surface of the membrane is washed away by regular aeration; a sewage outlet 5 is arranged at the bottom of the aeration for regular sewage discharge; the water inlet adopts a cross-flow water inlet, a raw water inlet 7 is arranged on the lower side of the lower end cover 3, a concentrated liquid outlet 8 is arranged on the upper side of the upper end cover 2, and a pure water outlet 16 is arranged at the top center of the upper end cover 2; the inorganic ceramic membrane element 4 inside the filter cartridge 1 adopts a stacked installation of 3mm ceramic diaphragms of decreasing size, and in order to adapt to the size of the circular filter barrel, arc-shaped ceramic diaphragms are adopted at both ends of the decreasing diaphragms; the bottom end of the flat ceramic membrane is fixed with epoxy resin and a sealing gasket 13, and the top end is the liquid outlet 8, which is fixed with a fixing ring 14; the connection between the upper end cover 2 and the lower end cover 3 and the filter cartridge 1 is provided with a sealing ring, and the threaded bayonet 18 with internal and external threads is adopted to fix the filter cartridge 1.

[0038] The inorganic ceramic membrane assembly of the present invention provides a combined flat ceramic ultrafiltration membrane assembly for water treatment and wastewater deep treatment. By using the assembly, the plate ceramic membrane can be used in the ultrafiltration system, making full use of the advantages of the ceramic diaphragm to achieve low-cost, large-area replacement of the existing hollow fiber membrane assembly, thereby achieving the purpose of improving system stability, reducing operating costs, and extending the operating life of the equipment. The purpose of the present invention is to solve the problem of users who have already applied organic membrane assemblies upgrading to inorganic membrane assemblies without replacing the original frame and piping system, shortening the transformation cycle, reducing the transformation cost, and achieving optimal operating performance.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An inorganic ceramic membrane assembly, comprising a filter cartridge, an upper end cover located at the upper end of the filter cartridge, and a lower end cover located at the lower end of the filter cartridge, wherein a liquid inlet is provided on the side of the lower end of the filter cartridge, a liquid outlet is provided on the side of the upper end of the filter cartridge, a water production port is provided on the upper end cover, and a sewage outlet is provided on the lower end cover, characterized in that: The filter cartridge is a cylinder, and an inorganic ceramic membrane element is arranged in the filter cartridge. The inorganic ceramic membrane element includes a flat membrane group located in the middle and an arc-shaped membrane located on the side of the flat membrane group. The length extension direction of the flat membrane group and the arc-shaped membrane is the same as the extension direction of the filter cartridge; The flat diaphragm group includes a plurality of flat diaphragms, which are superimposed and bonded to each other along the thickness direction of the flat diaphragms to form the flat diaphragm group, and the cross-sectional width of the flat diaphragm group gradually decreases from the middle to both sides along the thickness direction of the flat diaphragm group; the thickness of the flat diaphragm is 3mm or 4mm; An aeration device is also provided between the lower end cover and the inorganic ceramic membrane element, the aeration device comprising an air inlet and an air outlet connected to the air inlet, the air outlets being evenly distributed on the same circumference; The bubbles generated by the aeration device pass through the vent holes of the fixing mechanism at the bottom of the membrane element and act on the surface of the membrane, so that the pollutants attached to the surface of the membrane are separated from the membrane and accumulated in the dirt deposition area at the bottom of the aeration device. The sewage valve is regularly discharged by the control system, and the sewage is discharged from the sewage outlet. The lower end of the inorganic ceramic membrane element is provided with a membrane end cap, and the filter cartridge is provided with a fixing mechanism matching the membrane end cap, the fixing mechanism includes a vent hole and a lower buckle for clamping the membrane end cap; a sealing gasket is provided between the lower buckle and the membrane end cap, and the sealing gasket is provided on the lower surface of the membrane end cap; A membrane sealing ring is arranged at the upper end of the inorganic ceramic membrane element, an upper buckle matching the membrane sealing ring is arranged in the filter cartridge, a fixing ring is arranged between the upper buckle and the membrane sealing ring, and the fixing ring is sleeved on the outer side of the membrane sealing ring; the membrane sealing ring includes a top plate with a hollow hole and a side plate for fastening the flat membrane and the arc-shaped membrane together; An adhesive layer is provided between the bottom end of the inorganic ceramic membrane element and the membrane end cover, and the adhesive layer is composed of epoxy resin adhesive.

2. The inorganic ceramic membrane assembly according to claim 1, characterized in that: The arcuate diaphragm includes a plane portion that fits with the outermost flat diaphragm in the flat diaphragm group and an arcuate portion that matches with the inner wall of the filter cartridge. The width of the plane portion matches the width of the outermost flat diaphragm.

3. The inorganic ceramic membrane assembly according to claim 1, characterized in that: The upper end and the lower end of the filter cartridge are provided with external threads, and the upper end cover and the lower end cover are provided with internal threads corresponding to the external threads. The filter cartridge is connected with the upper end cover and the lower end cover through the external threads and the internal threads.

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