Composite reverse osmosis membrane element capable of secondary filtration

Abstract

The utility model relates to water treatment filtration technical field, concretely relates to a composite reverse osmosis membrane element of secondary filtration, include: shell, primary reverse osmosis membrane subassembly, secondary reverse osmosis membrane subassembly and flow guide mechanism, the water inlet is seted up to one end of shell, the water outlet is seted up to the other end of shell, primary reverse osmosis membrane subassembly and secondary reverse osmosis membrane subassembly are fixed in the inside of shell along the water flow direction in proper order, and flow guide mechanism is located between primary reverse osmosis membrane subassembly and secondary reverse osmosis membrane subassembly, and the both ends of shell are provided with end cap, set up primary reverse osmosis membrane subassembly and secondary reverse osmosis membrane subassembly in the inside of shell in proper order, and cooperate flow guide mechanism, and the integrated secondary filtration system is constructed, and this kind of composite structure realizes two stage high -efficient filtration in single membrane element, and the purity and consistency of final water production are improved significantly, and the problem that traditional multistage system structure is complicated, and the area of land is big is avoided simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of water treatment filtration technology, specifically to a composite reverse osmosis membrane element capable of secondary filtration. Background Technology

[0002] Reverse osmosis membranes are the core filter elements in modern water treatment equipment. Their working principle is mainly based on the selective osmosis mechanism. By applying external pressure, water is driven to flow through the surface of a semi-permeable membrane. The membrane's precise nanoscale pores trap impurities such as dissolved salts, colloids, organic matter, bacteria, and heavy metal ions in the water, thereby achieving water purification and desalination.

[0003] Currently, most widely used reverse osmosis membrane elements adopt a single filter layer structure. Their filtration accuracy is limited by the pore size distribution and surface characteristics of the material. For trace pollutants in water that are smaller in size and more soluble, such as some low-molecular-weight organic matter, endocrine disruptors, drug residues and specific ions, it is difficult to achieve efficient and thorough interception.

[0004] Some high-end water treatment systems employ multi-stage reverse osmosis in series or combined with other processes for composite filtration. However, these systems are often complex in structure and have low integration, resulting in a large overall size and increased footprint, which limits their application in space-sensitive scenarios. In addition, if the hydraulic distribution structure is not reasonable in the connection and water distribution design between multi-stage filtration units, it can easily cause some membrane elements to operate under overload, while other membrane elements fail to fully perform, resulting in a decrease in the overall water production efficiency of the system, an increase in energy consumption, and may cause water quality fluctuations, affecting the stability and consistency of the final produced water. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a composite reverse osmosis membrane element capable of secondary filtration, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a composite reverse osmosis membrane element capable of secondary filtration, comprising: a shell, a primary reverse osmosis membrane module, a secondary reverse osmosis membrane module, and a flow guiding mechanism. One end of the shell has an inlet, and the other end has an outlet. The primary and secondary reverse osmosis membrane modules are sequentially fixed inside the shell along the water flow direction. The flow guiding mechanism is located between the primary and secondary reverse osmosis membrane modules. Both ends of the shell are provided with end caps.

[0007] Furthermore, the outer shell is made of ABS engineering plastic, and slots are provided at both ends of the outer shell surface, with sealing rings engaged inside the slots.

[0008] Furthermore, the primary reverse osmosis membrane module includes a spiral wound reverse osmosis membrane with a molecular weight cutoff of 100-200 Da.

[0009] Furthermore, a water collection pipe is fixedly connected to the middle of the spiral reverse osmosis membrane, and several water permeable holes are evenly opened on the surface of the water collection pipe.

[0010] Furthermore, the secondary reverse osmosis membrane module includes a fixed frame, which is fixedly connected to the inner wall of the outer shell, and a nanofiltration layer is fixedly connected to the middle of the fixed frame.

[0011] Furthermore, the nanofiltration layer is a graphene oxide-polysulfone composite layer with a thickness of 50-100 μm.

[0012] Furthermore, the flow guiding mechanism includes a flow guiding plate, which is fixedly connected to the inner wall of the outer shell, and a number of flow diversion holes are evenly opened on the surface of the flow guiding plate.

[0013] Furthermore, the guide plate has a conical structure, and the diameter of the diversion holes gradually decreases along the direction of water flow.

[0014] Furthermore, the inner walls of both the inlet and outlet are provided with internal threads, and the surface of the end cap is provided with external threads, with the external threads and internal threads connected by threads.

[0015] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. By sequentially installing a primary reverse osmosis membrane module and a secondary reverse osmosis membrane module inside the outer casing, along with a flow guiding mechanism, an integrated secondary filtration system is constructed. The primary spiral wound reverse osmosis membrane can effectively remove most dissolved salts, organic matter, and microorganisms from the water, while the secondary nanofiltration layer can specifically intercept trace pollutants remaining after primary filtration, such as low-molecular-weight organic matter, drug residues, and specific ions. This composite structure achieves two-stage high-efficiency filtration within a single membrane element, significantly improving the purity and consistency of the final product water, while avoiding the problems of complex structure and large footprint of traditional multi-stage systems; 2. The flow guiding mechanism located between the two membrane modules can rectify and evenly distribute the primary product water, ensuring that the water flows into the secondary filtration zone at a stable and uniform flow rate and pressure. This effectively avoids uneven membrane element load, efficiency reduction, and potential fouling problems caused by local overflow or dead water zones. As a result, both membrane modules can fully exert their filtration efficiency, which helps maintain the stability of the system's long-term operation, reduces energy consumption, and extends the service life of the membrane elements. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the outer shell of this utility model; Figure 3 This is a schematic diagram of the structure of the two-stage reverse osmosis membrane module of this utility model; Figure 4 This is a schematic diagram of the end cap structure of this utility model.

[0018] The labels in the diagram represent: 1. Outer shell; 101. Inlet; 102. Outlet; 103. Internal thread; 104. Slot; 2. Primary reverse osmosis membrane module; 201. Spiral wound reverse osmosis membrane; 202. Water collection pipe; 203. Water permeation hole; 3. Secondary reverse osmosis membrane module; 301. Fixing frame; 302. Nanofiltration layer; 4. Flow guiding mechanism; 401. Flow guide plate; 402. Flow divider hole; 5. Sealing ring; 6. End cap; 601. External thread. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] The present invention will be further described below with reference to the embodiments. Example 1:

[0021] Reference Figure 1-4This is the first embodiment of the present invention, which discloses a composite reverse osmosis membrane element capable of secondary filtration, including: a shell 1, a primary reverse osmosis membrane assembly 2, a secondary reverse osmosis membrane assembly 3, and a flow guiding mechanism 4. One end of the shell 1 is provided with an inlet 101, and the other end of the shell 1 is provided with an outlet 102. The primary reverse osmosis membrane assembly 2 and the secondary reverse osmosis membrane assembly 3 are fixed in sequence inside the shell 1 along the water flow direction. The flow guiding mechanism 4 is provided between the primary reverse osmosis membrane assembly 2 and the secondary reverse osmosis membrane assembly 3. Both ends of the shell 1 are provided with end caps 6.

[0022] By sequentially arranging a primary reverse osmosis membrane module 2 and a secondary reverse osmosis membrane module 3 inside the outer casing 1, and cooperating with a flow guiding mechanism 4, an integrated secondary filtration system is constructed. The primary spiral wound reverse osmosis membrane 201 can effectively remove most of the dissolved salts, organic matter, and microorganisms in the water, while the secondary nanofiltration layer 302 can specifically intercept trace pollutants remaining after primary filtration, such as low-molecular-weight organic matter, drug residues, and specific ions. This composite structure achieves two-stage high-efficiency filtration within a single membrane element, significantly improving the purity and consistency of the final produced water, while avoiding the problems of complex structure and large footprint of traditional multi-stage systems. Example 2:

[0023] Reference Figure 1-4 This is the second embodiment of the present invention, which differs from the first embodiment in that: The outer shell 1 is made of ABS engineering plastic. Both ends of the outer shell 1 are provided with slots 104. A sealing ring 5 is snapped into the inside of the slots 104. The first-stage reverse osmosis membrane module 2 includes a spiral reverse osmosis membrane 201. The spiral reverse osmosis membrane 201 has a molecular weight cutoff of 100-200 Da. A water collection pipe 202 is fixedly connected to the middle of the spiral reverse osmosis membrane 201. Several water permeable holes 203 are evenly provided on the surface of the water collection pipe 202.

[0024] The secondary reverse osmosis membrane module 3 includes a fixed frame 301, which is fixedly connected to the inner wall of the outer shell 1. A nano-filter layer 302 is fixedly connected to the middle of the fixed frame 301. The nano-filter layer 302 is a graphene oxide-polysulfone composite layer with a thickness of 50-100μm.

[0025] The flow guiding mechanism 4 includes a flow guiding plate 401, which is fixedly connected to the inner wall of the outer shell 1. The surface of the flow guiding plate 401 is evenly provided with a plurality of flow diversion holes 402. The flow guiding plate 401 has a conical structure. The diameter of the flow diversion holes 402 gradually decreases along the water flow direction. The inner walls of the inlet 101 and the outlet 102 are provided with internal threads 103. The surface of the end cap 6 is provided with external threads 601. The external threads 601 and the internal threads 103 are threadedly connected.

[0026] The flow guiding mechanism 4, located between the two membrane modules, can rectify and distribute the primary product water, ensuring that the water flows into the secondary filtration zone at a stable and uniform flow rate and pressure. This effectively avoids uneven membrane element load, efficiency reduction, and potential fouling problems caused by local overflow or dead water zones. As a result, both membrane modules can fully exert their filtration efficiency, which helps maintain the stability of the system's long-term operation, reduces energy consumption, and extends the service life of the membrane elements.

[0027] The remaining structure is the same as that in Example 1.

[0028] The workflow of this utility model is as follows: First, raw water enters the membrane element through the inlet 101 at one end of the outer shell 1. It first flows through the first-stage reverse osmosis membrane module 2. The spiral wound reverse osmosis membrane 201 in the first-stage reverse osmosis membrane module 2 performs preliminary filtration of the raw water under pressure, effectively intercepting most of the dissolved salts, colloids, organic matter, bacteria and microorganisms and other pollutants in the water. The preliminarily purified water passes through the spiral wound reverse osmosis membrane 201 and is collected through the permeable holes 203 on the surface of its internal water collection pipe 202. Secondly, the water that has passed through the primary filtration enters the flow guiding mechanism 4. The flow guiding plate 401 and the flow diversion holes 402 on its surface rectify and distribute the water flow, ensuring that the water flows into the subsequent secondary filtration zone with a stable and uniform flow rate and pressure, thus avoiding local overflow or stagnant water areas. Finally, the evenly distributed water flows into the secondary reverse osmosis membrane module 3. The nano-filtration layer 302 in the middle of the fixed frame 301 performs secondary fine filtration on the water flow, specifically intercepting trace pollutants remaining after the primary filtration, such as low molecular weight organic matter, drug residues, environmental hormones and specific ions. The high-purity water produced after two stages of high-efficiency filtration finally flows out through the outlet 102 at the other end of the outer shell 1, completing the entire filtration process.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite reverse osmosis membrane element capable of secondary filtration, characterized in that, include: The enclosure (1), the primary reverse osmosis membrane module (2), the secondary reverse osmosis membrane module (3) and the flow guiding mechanism (4) are provided. One end of the enclosure (1) is provided with an inlet (101) and the other end of the enclosure (1) is provided with an outlet (102). The primary reverse osmosis membrane module (2) and the secondary reverse osmosis membrane module (3) are fixed inside the enclosure (1) in sequence along the water flow direction. The flow guiding mechanism (4) is located between the primary reverse osmosis membrane module (2) and the secondary reverse osmosis membrane module (3). Both ends of the enclosure (1) are provided with end caps (6).

2. The composite reverse osmosis membrane element capable of secondary filtration according to claim 1, characterized in that, The outer shell (1) is made of ABS engineering plastic. Both ends of the surface of the outer shell (1) are provided with slots (104), and a sealing ring (5) is snapped into the inside of the slots (104).

3. The composite reverse osmosis membrane element capable of secondary filtration according to claim 1, characterized in that, The primary reverse osmosis membrane module (2) includes a spiral wound reverse osmosis membrane (201) with a molecular weight cutoff of 100-200 Da.

4. The composite reverse osmosis membrane element capable of secondary filtration according to claim 3, characterized in that, A water collection pipe (202) is fixedly connected to the middle of the spiral reverse osmosis membrane (201), and a number of water permeable holes (203) are evenly opened on the surface of the water collection pipe (202).

5. The composite reverse osmosis membrane element capable of secondary filtration according to claim 1, characterized in that, The secondary reverse osmosis membrane module (3) includes a fixed frame (301), which is fixedly connected to the inner wall of the outer shell (1), and a nano-filter layer (302) is fixedly connected to the middle of the fixed frame (301).

6. The composite reverse osmosis membrane element capable of secondary filtration according to claim 5, characterized in that, The nanofiltration layer (302) is a graphene oxide-polysulfone composite layer, and the thickness of the nanofiltration layer (302) is 50-100 μm.

7. The composite reverse osmosis membrane element capable of secondary filtration according to claim 1, characterized in that, The flow guiding mechanism (4) includes a flow guiding plate (401), which is fixedly connected to the inner wall of the outer shell (1). The surface of the flow guiding plate (401) is evenly provided with a plurality of flow diversion holes (402).

8. A composite reverse osmosis membrane element capable of secondary filtration according to claim 7, characterized in that, The guide plate (401) has a conical structure, and the diameter of the diversion hole (402) gradually decreases along the water flow direction.

9. A composite reverse osmosis membrane element capable of secondary filtration according to claim 1, characterized in that, The inner walls of the inlet (101) and outlet (102) are provided with internal threads (103), and the surface of the end cap (6) is provided with external threads (601). The external threads (601) and the internal threads (103) are threaded together.

Images