A high-recovery water purification device based on electromagnetic scale inhibition and nanofiltration

Abstract

The utility model relates to a kind of high recovery rate water purification equipment based on electromagnetic scale inhibition and nanofiltration, including raw water tank, booster pump, security filter, high-pressure pump, nanofiltration membrane group, water production tank and concentrated water tank connected by pipeline in turn, nanofiltration membrane group adopts the membrane element with low calcium, magnesium ion interception rate, high monovalent salt and organic pollutant interception rate, further include electromagnetic scale inhibitor, electromagnetic scale inhibitor includes power module, high-frequency signal generator and electromagnetic coil winding on the outer wall of pipeline, high-frequency signal generator generates high-frequency oscillation current to drive the electromagnetic coil, and alternating electromagnetic field is formed in the water body inside pipeline.The utility model is coupled by electromagnetic scale inhibition technology and nanofiltration membrane technology, without a large number of relying on chemical scale inhibitor, can effectively inhibit the generation of calcium carbonate scale and silicate scale, can make system recovery rate stable to improve to 70%-85%, while retaining part of beneficial mineral trace elements in water production.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a high recovery rate water purification device based on electromagnetic scale inhibition and nanofiltration. Background Technology

[0002] Reverse osmosis (RO) technology is a core process for producing pure and ultrapure water. In traditional RO systems, chemical scale inhibitors are often added and the recovery rate is strictly controlled (usually 50%-70%) to prevent scaling on the membrane surface. This results in a large amount of feed water being discharged as concentrate, leading to a waste of water resources. Improving the recovery rate of RO systems is particularly important in water-scarce areas.

[0003] Increasing recovery rates leads to higher concentrations of dissolved solids (such as calcium carbonate, calcium sulfate, and silicates) on the concentrate side, making it more prone to scaling on the membrane surface. Silicate scale, in particular, is difficult to clean chemically and can severely damage membrane elements. Current technologies largely rely on highly efficient chemical scale inhibitors, but these still present problems such as potential pollution from chemical additives, increased operating costs, and environmental impact. Therefore, developing a water purification system that requires little or no chemical intervention and fundamentally reduces the risk of scaling to achieve high recovery rates is urgently needed. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration. By coupling electromagnetic scale inhibition technology with nanofiltration membrane technology, the generation of calcium carbonate scale and silicate scale can be effectively inhibited without relying on large amounts of chemical scale inhibitors. The system recovery rate can be stably increased to 70%-85%, while retaining some beneficial mineral trace elements in the product water.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration includes the following components connected sequentially via pipelines: Raw water tank, used to store raw water; A booster pump is used to transport raw water. Security filters are used to filter out particulate impurities to protect downstream membrane elements. High-pressure pumps are used to pressurize raw water. Nanofiltration membrane modules use membrane elements with low rejection rates for calcium and magnesium ions and high rejection rates for monovalent salts and organic pollutants. The system includes a permeate tank and a concentrate tank. The permeate tank collects the permeate from the nanofiltration membrane module and is usable. Since the membrane allows some calcium, magnesium, and silicates to pass through, this permeate is high-quality clean water containing appropriate amounts of beneficial trace elements. The concentrate tank collects the concentrated water from the nanofiltration membrane module. Due to the high system recovery rate, the concentrate discharge is reduced by approximately 30%-50% compared to traditional systems. It also includes an electromagnetic scale inhibitor, which comprises a power module, a high-frequency signal generator, and an electromagnetic coil wound around the outer wall of the pipe. The high-frequency oscillating current generated by the high-frequency signal generator drives the electromagnetic coil, forming an alternating electromagnetic field in the water inside the pipe. When water flows through the pipe acting on the electromagnetic scale inhibitor, the high-frequency electromagnetic field generated by the inhibitor acts on the water, increasing the activity of calcium and magnesium ions that form scale, making it difficult for them to form a hard calcite structure. This, in turn, increases the apparent solubility of calcium carbonate and effectively inhibits the formation of calcium carbonate scale.

[0006] Preferably, the nanofiltration membrane module uses a modified polyamide composite membrane with a molecular weight cutoff of 100-300 Daltons.

[0007] Preferably, the nanofiltration membrane module has a calcium and magnesium ion rejection rate in the range of 10%-15%, and a rejection rate of over 90% for monovalent salts and organic pollutants. The low rejection rate for calcium and magnesium ions indicates that a large number of calcium and magnesium ions can permeate through the membrane into the product water side with the water flow, thus preventing a sharp increase in calcium ion concentration on the concentrate side as seen in traditional RO systems. This further reduces the driving force for scaling. The rejection rate for monovalent salts such as NaCl and organic pollutants remains above 90%, ensuring the quality of the product water.

[0008] Preferably, the nanofiltration membrane module has a sulfate rejection rate of greater than 95% and a silicate rejection rate of less than 30%. The membrane also has a low silicate rejection rate (<30%), which allows most of the silicates to be discharged from the system, avoiding saturation on the concentrate side and the formation of difficult-to-treat silica scale.

[0009] Preferably, the filtration accuracy of the security filter is 1μm-5μm.

[0010] Preferably, the high-frequency oscillation current generated by the high-frequency signal generator has a frequency of 1kHz-50kHz.

[0011] Preferably, the electromagnetic coil of the electromagnetic scale inhibitor is wound around the outer wall of the pipe before the nanofiltration membrane module.

[0012] Preferably, the electromagnetic coil of the electromagnetic scale inhibitor is wound around the outer wall of the pipe between the booster pump and the nanofiltration membrane module.

[0013] Preferably, the overall water recovery rate of the water purification equipment is 70%-85%.

[0014] The advantages of this utility model are: 1. Significantly improved recovery rate: By leveraging the synergistic effect of "electromagnetic scale inhibition" and "nanofiltration", the risk of scaling of the two main scale substances, calcium carbonate and silicate, is reduced from the source, ensuring that the system can operate stably under high concentration conditions, increasing the recovery rate from the traditional 50-75% to 70-85%, effectively saving water resources.

[0015] 2. Green and environmentally friendly scale inhibition mechanism: Electromagnetic scale inhibitors use physical methods to change the crystallization habits of scale-forming ions, making it difficult for them to adhere and form scale. The entire process does not require the addition of or can greatly reduce the use of chemical scale inhibitors, avoiding the potential impact of chemical agents on water quality and secondary pollution to the environment, and reducing operating costs.

[0016] 3. Effectively controls silica scale while retaining beneficial minerals: The unique nanofiltration membrane selectively removes most harmful salts and organic matter, while allowing most silicates and small amounts of calcium and magnesium ions to pass through. On the one hand, this prevents silicates from concentrating and forming scale on the concentrate side; on the other hand, it retains appropriate amounts of beneficial trace elements such as silicon and potassium in the product water, enhancing its health value.

[0017] 4. Stable system operation and long service life: The electromagnetic scale inhibitor inhibits scale formation at the source, and the nanofiltration membrane itself is not prone to silica scale buildup. The combination of the two greatly reduces the degree of membrane fouling and cleaning frequency, extends the service life of the membrane, and ensures the long-term stable operation of the system.

[0018] 5. Simple and efficient process flow: The equipment has a high degree of integration and a compact process. It only adds an electromagnetic scale inhibitor and replaces the core membrane element on the basis of traditional RO pretreatment. The modification is simple, easy to implement and promote. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0020] Explanation of key component symbols in the diagram: 1. Raw water tank; 2. Booster pump; 3. Electromagnetic scale inhibitor; 3.1. Power module; 3.2. High-frequency signal generator; 3.3. Electromagnetic coil; 4. Security filter; 5. High-pressure pump; 6. Nanofiltration membrane module; 7. Product water tank; 8. Concentrate tank. Detailed Implementation

[0021] To more clearly illustrate this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0022] Example 1: As Figure 1 As shown, a high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration includes the following components connected in sequence via pipelines: Raw water tank 1 is used to store raw water; Booster pump 2 is used to transport raw water; Security filter 4 is used to filter and remove particulate impurities; High-pressure pump 5 is used to pressurize the raw water; Nanofiltration membrane module 6 uses membrane elements with low rejection rates for calcium and magnesium ions and high rejection rates for monovalent salts and organic pollutants. The product water tank 7 is used to collect the permeate water of the nanofiltration membrane module 6, and the concentrate water tank 8 is used to collect the concentrated water of the nanofiltration membrane module 6. It also includes an electromagnetic scale inhibitor 3, which includes a power module 3.1, a high-frequency signal generator 3.2, and an electromagnetic coil 3.3 wound around the outer wall of the pipe. The high-frequency oscillating current generated by the high-frequency signal generator 3.2 drives the electromagnetic coil 3.3 to form an alternating electromagnetic field in the water inside the pipe.

[0023] The overall water recovery rate of the water purification equipment is relatively high, ranging from 70% to 85%. Since the nanofiltration membrane module 6 allows some calcium, magnesium, and silicates to pass through, the produced water is high-quality clean water containing appropriate amounts of beneficial trace elements. The remaining concentrated water is discharged into the concentrated water tank 8. Given the high system recovery rate (70%-85%), the concentrated water discharge is reduced by approximately 30% to 50% compared to traditional systems.

[0024] Example 2: Based on Example 1, the nanofiltration membrane module 6 uses a modified polyamide composite membrane with a molecular weight cutoff of 100-300 Daltons.

[0025] The nanofiltration membrane group 6 has a rejection rate of 10%-15% for calcium and magnesium ions, and a rejection rate of over 90% for monovalent salts and organic pollutants. Meanwhile, the nanofiltration membrane group 6 has a rejection rate of over 95% for sulfate and a rejection rate of less than 30% for silicates.

[0026] Example 3: Based on Example 1 or Example 2, the filtration accuracy of the security filter 4 is 1μm-5μm, and the frequency of the high-frequency oscillation current generated by the high-frequency signal generator 3.2 is 1kHz-50kHz.

[0027] Example 4: Combination Figure 1 As shown, based on Embodiment 1, Embodiment 2 or Embodiment 3, the electromagnetic coil 3.3 of the electromagnetic scale inhibitor 3 is wound around the outer wall of the pipe before the nanofiltration membrane module 6.

[0028] Example 5: Combination Figure 1 As shown, based on Embodiment 4, the electromagnetic coil 3.3 of the electromagnetic scale inhibitor 3 is wound around the outer wall of the pipe between the booster pump 2 and the nanofiltration membrane module 6.

[0029] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. The present utility model can be used in similar products. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration, characterized in that, Including those connected sequentially via pipes: Raw water tank (1) is used to store raw water; A booster pump (2) is used to transport raw water; Security filter (4) is used to filter and remove particulate impurities; High-pressure pump (5) is used to pressurize the raw water; Nanofiltration membrane module (6) uses membrane elements with low rejection rates for calcium and magnesium ions and high rejection rates for monovalent salts and organic pollutants; The product water tank (7) and the concentrate tank (8) are used to collect the permeate water of the nanofiltration membrane group (6) and the concentrate tank (8) is used to collect the concentrated water of the nanofiltration membrane group (6). It also includes an electromagnetic scale inhibitor (3), which includes a power module (3.1), a high-frequency signal generator (3.2) and an electromagnetic coil (3.3) wound around the outer wall of the pipe. The high-frequency oscillating current generated by the high-frequency signal generator (3.2) drives the electromagnetic coil (3.3) to form an alternating electromagnetic field in the water inside the pipe.

2. The high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 1, characterized in that, The nanofiltration membrane module (6) uses a modified polyamide composite membrane with a molecular weight cutoff of 100-300 Daltons.

3. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 2, characterized in that, The nanofiltration membrane module (6) has a retention rate of 10%-15% for calcium and magnesium ions and a retention rate of over 90% for monovalent salts and organic pollutants.

4. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 2, characterized in that, The nanofiltration membrane group (6) has a sulfate rejection rate of more than 95% and a silicate rejection rate of less than 30%.

5. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 1, characterized in that, The filtration accuracy of the security filter (4) is 1μm-5μm.

6. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 1, characterized in that: The high-frequency oscillation current generated by the high-frequency signal generator (3.2) has a frequency of 1kHz-50kHz.

7. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 1, characterized in that, The electromagnetic coil (3.3) of the electromagnetic scale inhibitor (3) is wound around the outer wall of the pipe before the nanofiltration membrane assembly (6).

8. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to claim 7, characterized in that, The electromagnetic coil (3.3) of the electromagnetic scale inhibitor (3) is wound around the outer wall of the pipe between the booster pump (2) and the nanofiltration membrane assembly (6).

9. A high-recovery-rate water purification device based on electromagnetic scale inhibition and nanofiltration according to any one of claims 1-8, characterized in that, The overall water recovery rate of the water purification equipment is 70%-85%.

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