Composite treatment method of filter aid for filtering swimming pool

Abstract

The invention relates to the technical field of swimming pool filtration, in particular to a composite treatment method of a filter aid for swimming pool filtration, which comprises the following steps: S1, adding the filter aid: adding a powdered activated carbon filter aid into a filter through a feeding pump, and forming an activated carbon filter aid filter cake in the filter; s2, filtering: intercepting or adsorbing impurities when the water in the to-be-treated pond is filtered through an activated carbon filter aid filter cake and a filter, and continuously or intermittently supplementing a powdered activated carbon filter aid in order to maintain the filtering efficiency; s3, backwashing: when the pressure difference of the filter reaches a set value, backwashing is started, and intercepted and adsorbed pollutants and the activated carbon filter aid filter cake slurry are discharged into a drainage system together. The device has the effects of efficiently removing chloramine and other disinfection by-products, peculiar smell, pigment and other pollutants, guaranteeing the water quality safety of the swimming pool and maintaining normal operation of the swimming pool.

Description

Technical Field

[0001] This application relates to the technical field of swimming pool filtration, and in particular to a composite treatment method for a filter aid used in swimming pool filtration. Background Technology

[0002] The initial filling of a swimming pool requires water that meets drinking water standards. During use, the pool water is constantly contaminated by human bodies, environmental factors, and chemical additives. If the pool is not treated, these pollutants will continue to accumulate. The core function of swimming pool water treatment is to ensure that the water is safe, clean, and meets hygiene standards through physical and chemical technologies. Filtration is one of the most important water treatment methods for swimming pools.

[0003] Currently, based on the different filter media used, filters are divided into particulate filters and pre-coated membrane filters. The main filter media for particulate filters is quartz sand, while the filter aids for pre-coated membrane filters include diatomaceous earth and perlite. These two mainstream swimming pool technologies differ significantly in their working principles and applicable scenarios. Particulate filters have low filter media costs and high dirt-holding capacity, making them suitable for high-load water quality. However, their filter media is fixed, their filtration accuracy is limited, and they are ineffective against disinfection byproducts such as bacteria, viruses, algal spores, colloids, and chloramines, requiring subsequent chemical treatment. Furthermore, the effluent from particulate filters has low transparency.

[0004] Pre-coated membrane filters are a type of surface filtration that uses a filter cake layer formed by intercepting particles on the surface of a medium. They offer high filtration accuracy. Before filtration, a layer of filter aid is pre-coated onto the surface of the filter element (such as filter cloth) to form a microporous membrane. When water flows through, impurities are trapped on the membrane surface. However, they have weak filtration capabilities for disinfection byproducts such as chloramines, odors, pigments, and other pollutants.

[0005] In practical applications, microorganisms may accumulate inside the filter layer after long-term use, and algal spores in the pool water may, under certain circumstances, cause algae growth and outbreaks. Chloramine is mainly used for disinfection of pool water. When algae proliferate in large quantities in eutrophic pool water, they release organic matter (such as carbohydrates and proteins). These substances react with chloramine during disinfection to produce disinfection byproducts (such as chloroform and dichloroacetonitrile). When the pH balance of the pool water is disrupted, the water temperature changes, or the swimming load increases, the "green pool" phenomenon occurs, where the pool water changes from blue to a turbid green. Traditional particulate filters and pre-coated membrane filters cannot effectively remove disinfection byproducts such as chloramine, odors, pigments, and other pollutants from the pool water. Summary of the Invention

[0006] In order to efficiently remove disinfection byproducts such as chloramine, odors, pigments and other pollutants, ensure the safety of swimming pool water quality and maintain the normal operation of the swimming pool, this application provides a composite treatment method for a filter aid used in swimming pool filtration.

[0007] This application provides a composite treatment method for filter aids used in swimming pool filtration, which adopts the following technical solution: A composite treatment method for a filter aid used in swimming pool filtration includes the following steps: S1: Addition of filter aid: Powdered activated carbon filter aid is added into the filter through a feed pump, and an activated carbon filter aid cake is formed in the filter. S2: Filtration. When the water in the tank to be treated is filtered through activated carbon filter cake and filter, impurities are intercepted or adsorbed. In order to maintain filtration efficiency, powdered activated carbon filter aid is added continuously or intermittently. S3: Backwashing. When the filter differential pressure reaches the set value, backwashing is started. The pollutants that are trapped and adsorbed, along with the activated carbon filter cake slurry, are discharged into the drainage system.

[0008] By adopting the above technical solutions, traditional filters may accumulate microorganisms inside the filter layer after long-term use. Under certain circumstances, algae spores in the pool water may cause algae growth and outbreaks. When the acid-base balance of the pool water is disrupted, water temperature changes, or swimming load increases, the "blue pool" phenomenon will occur. For disinfection byproducts such as chloramine, odors, pigments and other pollutants in the pool water, powdered activated carbon filter aid is added to the filter. The powdered activated carbon filter aid forms an activated carbon filter cake in the filter, thereby adsorbing disinfection byproducts such as chloramine, odors, pigments and other pollutants in the pool water. It can quickly adsorb pollutants in the event of sudden water pollution and efficiently handle water pollution emergencies that cannot be effectively treated by chemical methods. During continuous use of the filter, powdered activated carbon filter aid is added continuously or intermittently to maintain the filtration efficiency of the activated carbon filter cake. After pollutants are trapped by the activated carbon filter cake, the water flow rate in the pool can easily decrease. When the pressure inside the filter reaches the set value, backwashing is initiated. At this time, the trapped and adsorbed pollutants, along with the activated carbon filter cake, are discharged into the drainage system, which helps to ensure the long-term use of the filter.

[0009] Optionally, the filter is a granular filter, wherein a quartz sand particle fixed filter media layer is provided inside the granular filter, and the activated carbon filter aid filter cake is disposed on the top surface of the quartz sand particle fixed filter media layer.

[0010] By adopting the above technical solution, the granular filter media layer in the granular filter is mainly a fixed filter media layer of quartz sand, with other media including anthracite and heavy ore. When powdered activated carbon filter aid is added to the granular filter, the activated carbon filter aid forms an activated carbon filter cake on the top surface of the fixed filter media layer, thereby adsorbing disinfection byproducts such as chloramine, odors, pigments and other pollutants in the pool water through the activated carbon filter cake.

[0011] Optionally, the filter is a diatomaceous earth filter, which contains a filter element. A first filter cake is formed on the top surface of the filter element, and the activated carbon filter aid filter cake is placed on the top surface of the first filter cake. The steps for forming the first filter cake include the following: S1.1: Mix diatomaceous earth with water to form a coating slurry; S1.2: The coating slurry is injected into the circulating filtration system by a feed pump, so that the first filter cake is formed on the surface of the filter element.

[0012] By adopting the above technical solution, the diatomaceous earth filter mainly contains diatomaceous earth filter aid, and the diatomaceous earth filter aid forms a first filter cake on the top surface of the filter element. The diatomaceous earth filter aid is made of diatomite and has a porous structure, which can efficiently intercept bacteria, algae and tiny particles. When powdered activated carbon filter aid is added to the diatomaceous earth filter, the powdered activated carbon filter aid forms an activated carbon filter cake on the top surface of the first filter cake. At this time, the activated carbon filter cake will efficiently adsorb disinfection byproducts such as chloramine, odors, pigments and other pollutants.

[0013] Optionally, the filter is a perlite filter, which also contains a filter element. A second filter cake is formed on the top surface of the filter element, and the activated carbon filter aid filter cake is placed on the top surface of the second filter cake. The steps for forming the second filter cake include the following: S1.1′: Mix perlite with water to form a coating slurry; S1.2′: The coating slurry is injected into the circulating filtration system by a feed pump, so that the second filter cake is formed on the surface of the filter element.

[0014] By adopting the above technical solution, the perlite filter mainly contains perlite filter aid, and the perlite filter aid forms a first filter cake on the top surface of the filter element. The perlite filter aid is made from expanded volcanic rock, has low density and low cost. When powdered activated carbon filter aid is added to the diatomaceous earth filter, the powdered activated carbon filter aid forms an activated carbon filter cake on the top surface of the first filter cake. At this time, the activated carbon filter cake will efficiently adsorb disinfection byproducts such as chloramine, odors, pigments and other pollutants.

[0015] Optionally, the process of injecting the coating slurry into the coating film further includes the following steps: S1.1.1: During the initial coating process, the finer powder that has passed through the filter element is returned to the water supply pipe before coating through the internal circulation system of the coating, and the finer powder is then coated onto the outer layer of the coating on the filter element and the initial coating. S1.1.2: After the coating material forms a stable filter cake, the filtered clean water flows into the swimming pool water inlet.

[0016] By adopting the above technical solution, since the diatomaceous earth or perlite powder has a fine particle size, when the diatomaceous earth or perlite powder is initially added into the filter, the fine diatomaceous earth or perlite powder can easily pass through the filter element. At this time, the internal circulation system can be started to allow the fine diatomaceous earth or perlite powder to be recoated into the gradually formed first / second filter cake, which is conducive to improving the stability of the formation of the first / second filter cake.

[0017] Optionally, the filter is a pre-coated membrane filter, which also contains a filter element. The top surface of the filter element is provided with a third filter cake, which is composed of diatomaceous earth, perlite, and water. The powdered activated carbon filter aid is mixed in the third filter cake to form a composite filter cake. The ratio of diatomaceous earth, perlite, and powdered activated carbon in the composite filter cake is 0.45:0.35:0.2.

[0018] By adopting the above technical solution, since diatomaceous earth alone is prone to clogging the filter element, perlite alone has a weak adsorption capacity, and powdered activated carbon alone is also prone to clogging the filter element, a composite ratio of diatomaceous earth, perlite, and powdered activated carbon of 0.45:0.35:0.2 is used. This not only achieves a balance between adsorption and filtration, making it suitable for ultrafiltration purification of pool water, but also effectively removes disinfection byproducts such as chloramine, odors, and pigments from the water for deep purification.

[0019] Optionally, the composite filter cake compounding process includes the following steps: S1.1”: Set the stirring parameters, where the speed is 200-400 rpm and the temperature is 25-40℃; S1.2”: Stepwise mixing, first disperse and stir the diatomaceous earth and perlite, then slowly add powdered activated carbon to finally form a composite slurry; S1.3”: The composite slurry is injected into the pre-coated membrane filter. Through the internal circulation system, the finer powder that has passed through the filter element is returned to the water supply pipe before coating, and finally a composite filter cake is formed on the surface of the filter element.

[0020] By adopting the above technical solution and through the above steps, a composite filter cake is formed in the pre-coated membrane filter. The composite filter cake can achieve a rejection rate of 95-99% for particles with a diameter ≥1μm, which is better than that of single diatomaceous earth (85-90%) or perlite (80-85%). At the same time, the composite filter cake increases the filtration rate by 20%, and the turbidity of the pool water can reach below 0.2NTU.

[0021] Optionally, during the filtration process using the pre-coated membrane filter, a variable frequency constant flow circulating pump based on an AI algorithm is used to dynamically adjust the dosage of diatomaceous earth, perlite, and powdered activated carbon filter aids.

[0022] By adopting the above technical solution and dynamically adjusting the dosage of diatomaceous earth, perlite, and powdered activated carbon filter aids through AI algorithms, it is possible to reduce material waste and lower costs.

[0023] Optionally, in step S3, a pressure sensor is used to monitor the pressure changes of the filter in real time. When the intercepted pollutants increase to a set value, the backwashing procedure is automatically started through the control system.

[0024] By adopting the above technical solution and monitoring the changes in water flow rate and pressure in real time, the pollutants intercepted are cleaned by a backwashing process when they increase to a preset value, which helps to ensure the stable operation of the pool water filtration.

[0025] In summary, this application includes the following beneficial technical effects: Traditional filters may accumulate microorganisms inside the filter layer after long-term use. Algae spores in the pool water may cause algae growth and outbreaks under certain circumstances. When the pH balance of the pool water is disrupted, water temperature changes, or swimming load increases, the "blue pool" phenomenon will occur. For disinfection byproducts such as chloramine, odors, pigments and other pollutants in the pool water, powdered activated carbon filter aid is added to the filter. The powdered activated carbon filter aid forms an activated carbon filter cake in the filter, thereby adsorbing disinfection byproducts such as chloramine, odors, pigments and other pollutants in the pool water. It can quickly adsorb pollutants in the event of sudden water pollution and efficiently handle water pollution emergencies that cannot be effectively treated by chemical methods. During continuous use of the filter, powdered activated carbon filter aid is added continuously or intermittently to maintain the filtration efficiency of the activated carbon filter cake. After pollutants are trapped by the activated carbon filter cake, the water flow rate in the pool can easily decrease. When the pressure inside the filter reaches the set value, backwashing is initiated. At this time, the trapped and adsorbed pollutants, along with the activated carbon filter cake, are discharged into the drainage system, which helps to ensure the long-term use of the filter. Attached Figure Description

[0026] Figure 1This is a flowchart illustrating the steps of the composite treatment method for the filter aid used in swimming pool filtration according to this application; Figure 2 This is a flowchart illustrating the steps involved in treating pool water using a particulate filter, as described in this application. Figure 3 This is a flowchart illustrating the steps involved in treating pond water using a diatomaceous earth filter, as described in this application. Figure 4 This is a flowchart illustrating the steps involved in treating pool water using a perlite filter, as described in this application. Figure 5 This is a flowchart illustrating the steps involved in treating pool water using a pre-coated membrane filter, as described in this application. Figure 6 This is a step diagram of the composite process of the composite filter cake in this application. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0028] See Figure 1 A composite treatment method for a filter aid used in swimming pool filtration includes the following steps: S1: Adding filter aid. First, prepare powdered activated carbon filter aid, and then add the powdered activated carbon filter aid into the filter through a feeding pump. At this time, the powdered activated carbon filter aid forms an activated carbon filter cake in the filter. S2: Filtration. After the pool water to be treated is input into the filter, it passes sequentially through the activated carbon filter cake and the filter media layer itself. During this process, impurities in the pool water are trapped or adsorbed. It is important to note that to maintain filtration efficiency, powdered activated carbon filter aid needs to be continuously or intermittently added to the filter. S3: Backwashing. The set value of the water pressure difference in the filter is generally set to 0.1-0.2MPa. When the water pressure difference reaches the set value, backwashing is started. At this time, the pollutants intercepted and adsorbed, along with the activated carbon filter cake slurry, are discharged into the drainage system.

[0029] Traditional filters may accumulate microorganisms inside the filter layer after long-term use, and algae spores in the pool water may, under certain circumstances, cause algae growth and outbreaks. Chloramine is mainly used for disinfection of pool water. When algae proliferate in large quantities in eutrophic pool water, they release organic matter (such as carbohydrates and proteins). These substances react with chloramine during disinfection to produce disinfection byproducts (such as chloroform and dichloroacetonitrile). When the pH balance of the pool water is disrupted, water temperature changes, or swimming load increases, the "green pool" phenomenon occurs, where the pool water changes from blue to a turbid green. To remove disinfection byproducts such as chloramine, odors, pigments, and other pollutants from the pool water, powdered activated carbon filter aid is added to the filter. This powdered activated carbon filter aid forms an activated carbon filter cake within the filter, thereby achieving the purpose of adsorbing disinfection byproducts such as chloramine, odors, pigments, and other pollutants from the pool water. It can rapidly adsorb pollutants in the event of sudden water pollution (such as algal blooms, chemical leaks, and chemical imbalances) and efficiently handle water pollution emergencies that cannot be effectively treated by chemical methods.

[0030] It is important to note that in order to maintain the filtration efficiency of the activated carbon filter cake, powdered activated carbon filter aid should be added continuously or intermittently during pool water filtration.

[0031] In addition, after pollutants are trapped by the activated carbon filter cake, the water flow rate in the pool is easily reduced. When the pressure inside the filter reaches the set value, backwashing is initiated. At this time, the trapped and adsorbed pollutants, along with the activated carbon filter cake, are discharged into the drainage system, which helps to ensure the long-term use of the filter.

[0032] Example 1: See Figure 2 The filter is a granular filter, with a quartz sand granule fixed filter media layer placed inside, and an activated carbon filter aid filter cake formed on the top surface of the quartz sand granule fixed filter media layer.

[0033] When filtering and disinfecting swimming pool water is required, the pool water is first pumped to the inlet of the granular filter. Then, powdered activated carbon filter aid is mixed with water to form a slurry. This slurry is then added to the pipe connection between the pump and the granular filter. The slurry flows into the granular filter along the pipe and forms an activated carbon filter cake on top of the quartz sand filter media layer. The main parameters of the activated carbon filter cake are as follows: Table 1. Main parameters of powdered activated carbon filter aid for granular fixed filter media layers. Powdered activated carbon filter aid parameter Filter aid specific particle size 200-300 mesh (0.074-.044mm) Bulk density <![CDATA[0.38–0.45g / cm 3 ]]> True density <![CDATA[2.0–2.2g / cm 3 ]]> Iodine value (mg / g) 800-1000 Filter cake thickness (mm) 2.0-4.0 Filtration rate (m / h) 10-20 <![CDATA[Weight of powdered activated carbon per unit filtration area (g / m 2 )]]> 180-360 Typical slurry concentration range 3-5％ The pool water is filtered through a particle filter before flowing into the disinfection system. Finally, the pool water is circulated back into the swimming pool, and this cycle is repeated to remove disinfection byproducts such as chloramine, odors, and pigments from the water.

[0034] Example 2: The difference from Example 1 is that the type of filter is different.

[0035] See Figure 3 The filter is a diatomaceous earth filter, and a filter element is fixedly installed inside the diatomaceous earth filter. In this second embodiment, the filter element is a filter cloth. A first filter cake is formed on the top surface of the filter element, and an activated carbon filter aid filter cake is formed on the top surface of the first filter cake.

[0036] The first filter cake is actually a diatomaceous earth slurry filter cake, and the forming steps of the first filter cake include the following: S1.1: Mix diatomaceous earth with water and stir to form a coating slurry; S1.2: The coating slurry is injected into the circulating filtration system by a feeding pump. After entering the diatomaceous earth filter, the coating slurry is finally formed on the surface of the filter element.

[0037] When filtering and disinfecting swimming pool water, the pool water is first pumped to the inlet of the diatomaceous earth filter. Then, the diatomaceous earth is mixed with water and stirred. The resulting coating slurry is added to the diatomaceous earth filter, forming the first filter cake on the filter element surface. Next, powdered activated carbon filter aid is mixed with water to form a powdered activated carbon filter aid slurry. This slurry is then added to the diatomaceous earth filter, forming an activated carbon filter aid cake on top of the first filter cake. The main parameters of the activated carbon filter aid cake at this stage are as follows: Table 2. Main parameters of powdered activated carbon filter aid added during diatomaceous earth filter filtration. Powdered activated carbon filter aid parameter Filter aid specific particle size 200-300 mesh (0.074-0.044mm) Bulk density <![CDATA[0.38–0.45g / cm 3 ]]> True density <![CDATA[2.0–2.2g / cm 3 ]]> Iodine value (mg / g) 800-1000 Filter cake thickness (mm) 1.0-2.0 Filtration rate (m / h) 4-9 <![CDATA[Weight of powdered activated carbon per unit filtration area (g / m 2 )]]> 180-360 Typical slurry concentration range 3-5％ The pool water is filtered through a diatomaceous earth filter before flowing into the disinfection system, and finally, the pool water is circulated back into the swimming pool. This cycle removes disinfection byproducts such as chloramine, odors, and pigments from the water.

[0038] It is worth noting that when the water pressure inside the diatomaceous earth filter reaches the set value, backwashing is initiated, at which point the waste residue (the pollutants intercepted and adsorbed along with the activated carbon filter cake slurry) is discharged into the drainage system.

[0039] Example 3: The difference from Examples 1 and 2 is that the type of filter is different.

[0040] See Figure 4The filter is a perlite filter, and a filter element is fixedly installed inside the perlite filter. In this third embodiment, the filter element is also a filter cloth. A second filter cake is formed on the top surface of the filter element, and an activated carbon filter aid filter cake is formed on the top surface of the second filter cake.

[0041] The steps for forming the second filter cake include the following: S1.1′: Mix perlite with water and stir to form a coating slurry; S1.2′: The coating slurry is injected into the circulating filtration system by a feed pump, so that the second filter cake is formed on the surface of the filter element.

[0042] When the swimming pool water needs to be filtered and disinfected, the pool water is first pumped to the inlet of the perlite filter. Then, the perlite is mixed with water and stirred. The resulting coating slurry is added to the perlite filter, where it forms a second filter cake on the filter element surface. Next, powdered activated carbon filter aid is mixed with water to form a powdered activated carbon filter aid slurry. This slurry is then added to the perlite filter, forming an activated carbon filter cake on top of the second filter cake. The main parameters of the activated carbon filter cake at this point are as follows: Table 3. Main parameters for adding powdered activated carbon filter aid during perlite filter filtration. Powdered activated carbon filter aid parameter Filter aid specific particle size 200-300 mesh (0.074-0.044mm) Bulk density <![CDATA[0.38–0.45g / cm 3 ]]> True density <![CDATA[2.0–2.2g / cm 3 ]]> Iodine value (mg / g) 800-1000 Filter cake thickness (mm) 1.0-2.0 Filtration rate (m / h) 4-9 <![CDATA[Weight of powdered activated carbon per unit filtration area (g / m 2 )]]> 180-360 Typical slurry concentration range 3-5％ The pool water is filtered through a perlite filter before flowing into the disinfection system, and finally recirculated back into the swimming pool. This cycle removes disinfection byproducts such as chloramine, odors, and pigments from the water.

[0043] Similarly, when the water pressure inside the perlite filter reaches the set value, backwashing is initiated, at which point the waste residue (the trapped and adsorbed pollutants along with the activated carbon filter cake slurry) is discharged into the drainage system.

[0044] It is worth noting that in Examples 2 and 3, the following steps are also included in the process of forming the coating slurry on the surface of the filter element: S1.1.1: During the initial coating process, the finer powder that has passed through the filter element is returned to the water supply pipe before coating through the internal circulation system within the coating. The finer powder is then coated onto the outer layer of the filter element and the initial coating. S1.1.2: After the coating material forms a stable filter cake, the filtered clean water flows into the swimming pool water inlet.

[0045] Because diatomaceous earth or perlite powder has a fine particle size, when it is initially added to the filter, the fine particles can easily pass through the filter element. At this time, the internal circulation system can be activated to allow the fine particles to be re-coated into the gradually forming first and second filter cakes, thereby improving the stability of the formation of the first and second filter cakes.

[0046] Similarly, when the powdered activated carbon filter aid is added for the first time, the finer-particle-size powder is re-coated into the gradually forming activated carbon filter aid cake through the internal circulation system, which helps to improve the stability of the activated carbon filter aid cake formation.

[0047] It should be noted that in Examples 2 and 3, adding powdered activated carbon filter aid to the diatomaceous earth filter and perlite filter not only improves the filtration rate and reduces effluent turbidity, but also effectively removes disinfection byproducts such as chloramine, odors, pigments, and other pollutants. The main parameters for adding powdered activated carbon filter aid during diatomaceous earth (perlite) filtration are as follows: Table 4. Main parameters of powdered activated carbon filter aid added during diatomaceous earth filter (perlite filter) filtration. Example 4: The difference from Examples 1, 2, and 3 is that the type of filter is different.

[0048] See Figure 5 The filter is a pre-coated membrane filter, with filter elements fixedly installed inside. A third filter cake is formed on the top surface of the filter elements. The third filter cake is composed of diatomaceous earth, perlite, and water, and powdered activated carbon filter aid is mixed in the third filter cake to form a composite filter cake. The ratio of diatomaceous earth, perlite, and powdered activated carbon in the composite filter cake is 0.45:0.35:0.2.

[0049] Diatomaceous earth, perlite, and powdered activated carbon in the composite filter cake play a complementary role. Diatomaceous earth, with its porous structure (porosity 60-80%), provides mechanical support and enhances the rigidity of the composite filter cake, making it suitable for trapping micron-sized particles; however, it easily clogs the filter element when used alone. Perlite, with its high porosity (80-90%), is lightweight and has a fast filtration speed, but its adsorption capacity is weak; mixing it with diatomaceous earth can quickly optimize its performance. Powdered activated carbon has strong adsorption properties (specific surface area 500-1500 m²). 2 / g), can remove small molecule organic matter and pigments, but it is easy to clog the filter element when used alone.

[0050] Therefore, by using a composite filter cake with a ratio of diatomaceous earth, perlite, and powdered activated carbon of 0.45:0.35:0.2, it is beneficial to balance the adsorption and filtration phases, making it suitable for ultrafiltration purification of pool water and for deep purification by removing disinfection byproducts such as chloramines, odors, and pigments from the water.

[0051] See Figure 6 The composite filter cake compounding process includes the following steps: S1.1”: Set the stirring parameters, with a stirring speed of 200-400 rpm and a temperature of 25-40℃ to avoid high temperature causing a decrease in the adsorption capacity of activated carbon; S1.2”: Stepwise mixing, first disperse and stir the diatomaceous earth and perlite, then slowly add powdered activated carbon, which helps to prevent particle agglomeration and finally form a composite slurry; S1.3”: The composite slurry is injected into the pre-coated membrane filter. Through the internal circulation system, the finer powder that has passed through the filter element is returned to the water collection pipe before coating, and finally a composite filter cake is formed on the surface of the filter element.

[0052] After the composite filter cake is formed, its retention rate for particles with a diameter ≥1μm can reach 95-99%, which is better than that of single diatomaceous earth (85-90%) or perlite (80-85%). At the same time, the composite filter cake increases the filtration rate by 20%, and the turbidity of the pool water can reach below 0.2NTU.

[0053] Specifically, when using a pre-coated membrane filter for filtration, a variable frequency constant flow circulating pump based on an AI algorithm is used to dynamically adjust the dosage of diatomaceous earth, perlite, and powdered activated carbon filter aids.

[0054] A control system is installed and electrically connected to the pre-coated membrane filter. The control system forms a closed loop through real-time sensing, intelligent decision-making, precise execution, and feedback optimization. First, data acquisition occurs through online sensors (turbidity meter, COD detector, pressure transmitter, etc.) collecting data such as filtration system pressure, which is transmitted to the AI ​​control platform. Then, AI makes decisions; the control platform inputs real-time data into a trained model to calculate the optimal dosage of the three filter aids under the current operating conditions. Next, the pump group executes; the AI ​​platform sends control signals to the variable frequency constant flow circulating pump, and the pump group adjusts its speed according to the instructions to precisely deliver the corresponding amount of filter aid. Finally, feedback optimization occurs; the system continuously monitors effluent indicators and filtration efficiency. If the effluent turbidity exceeds the standard or the pressure difference is abnormal, the AI ​​model automatically corrects the dosage parameters and updates the model parameters to improve the accuracy of subsequent decisions. Compared to traditional manual adjustment or fixed program control, it has the advantages of high precision, low cost, and strong anti-interference.

[0055] Specifically, in step S3 above, a pressure sensor is used to monitor the pressure changes of the filtered water in real time to ensure stable operation of the filtration system. However, when the water pressure increases to the set value after the filter intercepts pollutants, the backwashing procedure is automatically started by the control system.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A composite treatment method for a filter aid used in swimming pool filtration, characterized in that, Includes the following steps: S1: Addition of filter aid: Powdered activated carbon filter aid is added into the filter through a feed pump, and an activated carbon filter aid cake is formed in the filter. S2: Filtration. When the water in the tank to be treated is filtered through activated carbon filter cake and filter, impurities are intercepted or adsorbed. In order to maintain filtration efficiency, powdered activated carbon filter aid is added continuously or intermittently. S3: Backwashing. When the filter differential pressure reaches the set value, backwashing is started. The pollutants that are trapped and adsorbed, along with the activated carbon filter cake slurry, are discharged into the drainage system.

2. The composite treatment method for a filter aid for swimming pool filtration according to claim 1, characterized in that: The filter is a granular filter, and a quartz sand particle fixed filter media layer is provided inside the granular filter, and the activated carbon filter aid filter cake is provided on the top surface of the quartz sand particle fixed filter media layer.

3. The composite treatment method for a filter aid for swimming pool filtration according to claim 1, characterized in that: The filter is a diatomaceous earth filter, which contains a filter element. A first filter cake is formed on the top surface of the filter element, and the activated carbon filter aid filter cake is placed on the top surface of the first filter cake. The steps for forming the first filter cake include the following: S1.1: Mix diatomaceous earth with water to form a coating slurry; S1.2: The coating slurry is injected into the circulating filtration system by a feed pump, so that the first filter cake is formed on the surface of the filter element.

4. The composite treatment method for a filter aid for swimming pool filtration according to claim 1, characterized in that: The filter is a perlite filter, which also contains filter elements. A second filter cake is formed on the top surface of the filter elements, and the activated carbon filter aid filter cake is placed on the top surface of the second filter cake. The steps for forming the second filter cake include the following: S1.1´: Mix perlite with water to form a coating slurry; S1.2´: The coating slurry is injected into the circulating filtration system by a feed pump, so that the second filter cake is formed on the surface of the filter element.

5. A composite treatment method for a filter aid for swimming pool filtration according to claim 3 or 4, characterized in that: The process of injecting the coating slurry into the coating film also includes the following steps: S1.1.1: During the initial coating process, the finer powder that has passed through the filter element is returned to the water supply pipe before coating through the internal circulation system of the coating, and the finer powder is then coated onto the outer layer of the coating on the filter element and the initial coating. S1.1.2: After the coating material forms a stable filter cake, the filtered clean water flows into the swimming pool water inlet.

6. The composite treatment method for a filter aid for swimming pool filtration according to claim 1, characterized in that: The filter is a pre-coated membrane filter, which also contains a filter element. A third filter cake is provided on the top surface of the filter element. The third filter cake is composed of diatomaceous earth, perlite, and water. The powdered activated carbon filter aid is mixed in the third filter cake to form a composite filter cake. The ratio of diatomaceous earth, perlite, and powdered activated carbon in the composite filter cake is 0.45:0.35:0.

2.

7. The composite treatment method for a filter aid for swimming pool filtration according to claim 6, characterized in that: The composite filter cake composite process includes the following steps: S1.1”: Set the stirring parameters, where the speed is 200-400 rpm and the temperature is 25-40℃; S1.2”: Stepwise mixing, first disperse and stir the diatomaceous earth and perlite, then slowly add powdered activated carbon to finally form a composite slurry; S1.3”: The composite slurry is injected into the pre-coated membrane filter. Through the internal circulation system, the finer powder that has passed through the filter element is returned to the water supply pipe before coating, and finally a composite filter cake is formed on the surface of the filter element.

8. The composite treatment method for a filter aid for swimming pool filtration according to claim 7, characterized in that: During the filtration process using the pre-coated membrane filter, a variable frequency constant flow circulating pump based on an AI algorithm is used to dynamically adjust the dosage of diatomaceous earth, perlite, and powdered activated carbon filter aids.

9. The composite treatment method for a filter aid for swimming pool filtration according to claim 1, characterized in that: In step S3, a pressure sensor is used to monitor the pressure changes of the filter in real time. When the amount of pollutants intercepted increases to a set value, the backwashing procedure is automatically started through the control system.

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