A magnetic seed recovery rate detection method based on magnetic seed liquid sampling

Abstract

The present application relates to magnetic coagulation wastewater purification process technical field, disclose a kind of based on magnetic seed liquid sampling magnetic seed recovery rate detection method, including magnetic seed recovery rate detection calculation method, the detection calculation method of magnetic seed loss rate and the calculation method of magnetic seed replenishment amount, wherein magnetic seed recovery rate detection method includes: respectively at the start and end of a cycle, the magnetic seed liquid sampling is carried out to the magnetic seed liquid injection point of coagulation reaction system;The concentration of suspended solids in the sampling liquid of two time points is used as magnetic seed amount;According to the magnetic seed amount of two time points, the magnetic seed recovery rate is calculated.The present application is used for the quantitative evaluation of magnetic seed recovery rate in magnetic coagulation wastewater purification process, provides the basis for design manufacturing and commissioning detection acceptance for magnetic coagulation wastewater purification system manufacturer, supplier, user.

Description

Technical Field

[0001] This invention provides a method for detecting magnetic seed recovery rate based on magnetic seed solution sampling. It is used to detect and calculate the magnetic seed recovery rate in a magnetic coagulation purification wastewater process where magnetic seeds are prepared into a magnetic seed solution at a certain concentration and added in a cyclic manner. This method belongs to the field of solid-liquid separation and purification technology. Background Technology

[0002] In the field of solid-liquid separation and wastewater purification technology, magnetic coagulation sedimentation and magnetic coagulation-magnetic separation processes have been widely used in recent years. Magnetic coagulation sedimentation is a loaded sedimentation process. By adding magnetic powder with a high specific gravity to the wastewater, the magnetic flocs generated by the coagulation reaction have excellent settling properties, achieving rapid sedimentation and separation of wastewater for purification. It has a higher separation efficiency than traditional inclined tube sedimentation, thus increasing the surface loading of the sedimentation tank and requiring less floor space. Magnetic coagulation-magnetic separation, also known as supermagnetic separation, involves adding magnetic powder to the wastewater, giving the flocs generated by the coagulation reaction excellent magnetism. The magnetic floc sludge is then rapidly separated from the wastewater by magnetic adsorption in a magnetic separator, purifying the water. The magnetic floc sludge separated by both processes is recycled by a magnetic seed recovery machine to recover the magnetic powder, which is then added back to the coagulation reaction system for reuse. There are two methods for recycling and adding magnetic seeds: one is to prepare a magnetic seed solution of a certain concentration after recycling and then add it back to the system. This magnetic seed solution has a better mixing effect with wastewater and is widely used in magnetic coagulation and separation processes. The other is to directly add the magnetic seeds in a semi-fluid state after recycling, which is widely used in magnetic coagulation and sedimentation processes. During the recycling process, some magnetic seeds are lost. This loss occurs both with the effluent and with the sludge during the recovery process. The sum of these two losses is the magnetic seed loss, or magnetic seed depletion. The percentage of magnetic seed depletion to the amount of magnetic seeds added is the magnetic seed loss rate. To maintain the stable performance of the wastewater treatment system and ensure that the effluent quality meets standards, magnetic powder needs to be continuously or intermittently replenished to compensate for the loss. Corresponding to magnetic seed loss is the system's magnetic seed recovery capacity. The indicator for measuring the system's magnetic seed recovery capacity is the magnetic seed recovery rate, which is the percentage of the amount of magnetic seeds recovered to the amount of magnetic seeds added. A higher magnetic seed loss rate means a lower magnetic seed recovery rate, requiring a larger amount of replenished magnetic seed and resulting in higher system operating costs. Furthermore, the loss of magnetic seed with effluent and sludge can cause secondary pollution, necessitating minimizing loss. Currently, there is no unified standard for the definition and specific testing methods of magnetic seed recovery rate. This situation makes it difficult for manufacturers to accurately assess the performance of their magnetic coagulation purification systems and also complicates user acceptance evaluation, becoming a pressing issue. In engineering practice, users can judge the system's magnetic seed recovery capacity and loss based on the amount of magnetic seed replenishment under long-term stable operation, providing experience for appropriate replenishment and operating cost estimation. However, this experience based on actual dosage takes a long time, making it difficult to use in the acceptance phase. Moreover, the lack of a unified standard and method for calculating magnetic seed recovery rate can easily lead to disputes between users and suppliers. On the other hand, simply simulating the difference in magnetic seed content between the feed and effluent of the magnetic seed recovery machine on-site cannot fully reflect the loss and recovery of magnetic seeds during the operation of the magnetic coagulation system. Furthermore, constructing a simulation system is quite complex and difficult to implement on-site. Summary of the Invention

[0003] Therefore, in order to overcome the above-mentioned shortcomings, the present invention provides a method for detecting magnetic seed recovery rate based on magnetic seed liquid sampling. This method is used for quantitative evaluation of magnetic seed recovery rate in magnetic coagulation wastewater purification process, providing a basis for design, manufacturing, commissioning and testing for manufacturers, suppliers and users of magnetic coagulation wastewater purification systems.

[0004] Specifically, a method for detecting magnetic seed recovery rate based on magnetic seed solution sampling includes a method for calculating the magnetic seed recovery rate, which includes:

[0005] Magnetic seed solution samples were taken at the beginning and end of each magnetic seed cycle at the inlet point of the coagulation reaction system. One magnetic seed cycle refers to the residence time required from wastewater entering the magnetic coagulation system to the effluent discharge when the coagulation reaction system is debugged to a stable operating state. The magnetic seed solution is prepared into a liquid of a certain concentration by continuously replenishing water from semi-fluid magnetic seeds recovered by the magnetic seed recovery machine. This liquid is then circulated and added to the coagulation reaction system at a certain flow rate by the magnetic seed pump. Therefore, sampling at the magnetic seed solution inlet point at the front end of the coagulation reaction system, i.e., the outlet of the magnetic seed pump, can comprehensively and completely reflect the loss of magnetic seeds in the magnetic coagulation purification process system and the system's magnetic seed recovery capacity.

[0006] The concentration of suspended solids in the sampled liquid at the starting point is taken as the starting magnetic seed quantity and denoted as SS1. The concentration of suspended solids in the sampled liquid at the ending point is taken as the ending magnetic seed quantity and denoted as SS2. The starting and ending magnetic seed quantities reflect the change in magnetic seed content in the magnetic seed liquid during one magnetic seed cycle, that is, the change in magnetic seed concentration due to magnetic seed loss. Therefore, their ratio reflects the degree of magnetic seed loss and the degree of magnetic seed recovery.

[0007] The magnetic seed recovery rate is calculated using the following formula;

[0008]

[0009] Where ρ1 is the magnetic seed recovery rate.

[0010] The smaller the difference between SS2 and SS1, the less magnetic seed loss and the higher the magnetic seed recovery capability.

[0011] Optionally, a method for detecting magnetic seed recovery rate based on magnetic seed solution sampling also includes a method for detecting and calculating magnetic seed loss rate.

[0012] The method for detecting and calculating the magnetic seed loss rate is to calculate the magnetic seed loss rate using the following formula;

[0013] μ1=(1-ρ1)×100%,

[0014] Where: μ1 is the magnetic seed loss rate.

[0015] Optionally, a magnetic seed recovery rate detection method based on magnetic seed solution sampling also includes a method for calculating the amount of magnetic seed replenishment, which varies depending on the manifestation of the amount of magnetic seed replenishment.

[0016] When the magnetic seed replenishment amount refers to the amount of magnetic seed that needs to be added within one magnetic seed cycle, and is equal to the amount of magnetic seed loss during that time period; under this condition, the calculation method for the magnetic seed replenishment amount is as follows:

[0017] Let T0 be the amount of magnetic seeds added before the start of a cycle, i.e., the initial amount of magnetic seeds added.

[0018] The total magnetic seed circulation volume is calculated based on the initial magnetic seed addition amount T0 using the following formula.

[0019] T1 = ηT0,

[0020] Where: T1 is the total magnetic seed circulation, and η is the correction coefficient considering the initial magnetic seed deposition;

[0021] The amount of magnetic seed replenishment is then calculated using the following formula.

[0022] T2 = T1 × μ1,

[0023] T2 represents the amount of magnetic seed replenishment.

[0024] When the magnetic seed replenishment amount refers to the amount of magnetic seed that needs to be added from the starting point to any point in time that is greater than one cycle, it is denoted as T3, and the wastewater treatment volume during the time period between the starting point and any point in time is denoted as Q2; where T3 is calculated according to the following formula:

[0025]

[0026] Q1 represents the wastewater treatment volume within a single cycle.

[0027] Optionally, a method for detecting the magnetic seed recovery rate in a magnetic coagulation wastewater purification process further includes calculating the actual magnetic seed recovery rate over a time period from the starting point to any point in time greater than one cycle. This calculation method includes:

[0028] The actual amount of magnetic seeds added during the time period from the starting point to any point in time is denoted as T4.

[0029] The actual magnetic seed recovery rate over the time period from the starting point to any given time point can be calculated using the following formula.

[0030]

[0031] Where Q1 is the wastewater treatment volume within a cycle, Q2 is the wastewater treatment volume within the time period between the starting point and any given time point, T1 is the total magnetic seed circulation volume within a cycle, and ρ2 is the actual magnetic seed recovery rate within the time period between the starting point and any given time point. By cross-referencing ρ2 and ρ1, the method for calculating the ρ2 value can be used as a method for calculating the magnetic seed recovery rate when the ρ1 value is unavailable.

[0032] This invention simplifies a magnetic seed cycle by defining it as the residence time required from the time wastewater enters the magnetic coagulation system to the time clear water is discharged, while ignoring the time spent on the magnetic seed recovery stage. This is because, as is well known, the time from the magnetic coagulation reaction to the completion of solid-liquid separation—that is, the system's hydraulic residence time—is much longer than the time spent on the magnetic seed recovery stage. Of course, the time spent on stages such as magnetic seed recovery can be included without affecting the effectiveness of this invention.

[0033] The present invention has the following advantages:

[0034] The magnetic seed recovery rate detection method provided by this invention is for applications where recovered semi-fluid magnetic seeds are prepared into a magnetic seed solution of a certain concentration and circulated for addition. Specifically, the recovered semi-fluid magnetic seeds are continuously replenished with water to prepare a liquid of a certain concentration, which is then circulated into the coagulation reaction system via a magnetic seed pump at a certain flow rate. Therefore, by sampling at the magnetic seed solution inlet (the outlet of the magnetic seed pump) at the front end of the coagulation reaction system, and calculating the ratio of magnetic seed concentration at the beginning and end of one cycle, this method comprehensively reflects the loss and degradation of magnetic seeds during the recycling process in the magnetic coagulation purification process system, as well as the system's magnetic seed recovery capacity. This method provides a solution for the quantitative evaluation of the magnetic seed recovery rate in magnetic coagulation purification processes, and provides a basis for the design, manufacturing, on-site commissioning, testing, and acceptance of magnetic coagulation wastewater purification systems for manufacturers, suppliers, and users.

[0035] The method for detecting and calculating the magnetic seed recovery rate described in this invention is based on a stable and compliant system operation. During magnetic seed solution sampling, it is necessary to continuously stabilize the replenishment water volume of the magnetic seed and the pumping circulation flow rate of the magnetic seed solution, while minimizing fluctuations in the effluent water quality indicators.

[0036] The above method can also avoid the disadvantages of traditional methods in constructing complex sampling systems or devices, and can also overcome the problem that traditional methods rely on the recovery capacity of the magnetic seed recovery machine itself and cannot reflect the possible loss of magnetic powder with the effluent. The magnetic seed recovery rate detection method based on magnetic seed liquid sampling described in this invention can more comprehensively reflect the magnetic seed loss and recovery status of the water treatment system. Attached Figure Description

[0037] Figure 1 This is a flowchart illustrating the magnetic seed recovery rate detection and calculation method described in this invention. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0039] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0040] As described in the background section, there is currently no unified standard for the definition and specific testing methods of magnetic seed recovery rate. This situation makes it difficult for manufacturers to accurately assess the performance of the magnetic coagulation purification systems they produce and provide, and also causes difficulties for users in acceptance evaluation, becoming a problem that urgently needs to be solved. In engineering practice, users can judge the magnetic seed recovery capacity and magnetic seed loss of the system based on the amount of magnetic seed replenishment under long-term stable operation, providing experience for the appropriate replenishment of magnetic seed and the estimation of operating costs. However, this experience based on actual dosage takes a long time to obtain and is difficult to use in the acceptance phase. Moreover, in the absence of a unified standard and a method for calculating magnetic seed recovery rate, disputes between users and suppliers are easily caused.

[0041] For the reasons mentioned above, such as Figure 1 As shown, this invention provides a method for detecting the magnetic seed recovery rate in a magnetic coagulation wastewater purification process, including a method for calculating the magnetic seed recovery rate and a method for calculating the magnetic seed loss rate. First, the residence time required from wastewater entering the magnetic coagulation system to the effluent is defined as the system residence time, which is also one cycle of the magnetic seed, denoted as t1. Its starting point is time point 1, and its ending point is time point 2. Both the magnetic seed recovery rate and the magnetic seed loss rate are indicators of the magnetic seed within one cycle t1.

[0042] The method for calculating the magnetic seed recovery rate includes the following steps:

[0043] Step S1: Adjust the magnetic coagulation purification system to a stable and compliant operating state. The total magnetic seed dosage at this point is denoted as T0, which represents the initial magnetic seed dosage, including the initial magnetic seed deposition and circulation volume. The total magnetic seed circulation volume within time period t1 is denoted as T1, which is the value obtained by subtracting the initial magnetic seed deposition from T0.

[0044] T1 = ηT0,

[0045] Where η is a correction factor considering the initial magnetic seed deposition. η is taken as an empirical value of 0.5 or adjusted according to engineering experience;

[0046] Step S2: At time point 1, take a certain amount of sample, such as 1L of magnetic seed liquid, at the magnetic seed liquid addition point of the coagulation reaction system. The average of three samples can be taken.

[0047] Step S3: At time point 2, take a sample of the same volume of magnetic seed liquid as in the previous step at the magnetic seed liquid addition point of the coagulation reaction system. The average of three samples can be taken.

[0048] Step S4: Send the two samples taken in steps S3 and S4 above for testing. Detect the suspended solids concentration of the two samples according to the suspended solids concentration detection method. Use this as the magnetic seed quantity of the two samples. The magnetic seed quantity at time point 1 is recorded as SS1, and the magnetic seed quantity at time point 2 is recorded as SS2.

[0049] Step S5: Calculate the magnetic seed recovery rate using the following formula:

[0050]

[0051] In one embodiment, the magnetic seed loss rate is calculated using the following formula.

[0052] μ1=(1-ρ1)×100%,

[0053] Where: μ1 is the magnetic seed loss rate.

[0054] In engineering practice, users can judge the magnetic seed recovery capacity and loss of a system based on the amount of magnetic seed replenishment under long-term stable operation, providing experience for appropriate replenishment and operating cost estimation. However, this experience based on actual dosage takes a long time to acquire and is difficult to use in the acceptance phase. Furthermore, the lack of a unified standard and calculation method for magnetic seed recovery rate can easily lead to disputes between users and suppliers. In addition, some engineering practices only consider the recovery capacity of the magnetic seed recovery machine, judging the magnetic seed recovery rate based on this while ignoring the potential loss of magnetic seed with the effluent. This does not reflect the overall magnetic seed recovery capacity, replenishment amount, and operating cost that users are truly concerned about. Based on this, in one embodiment, the magnetic seed recovery rate detection method for the magnetic coagulation wastewater purification process of the present invention also includes a method for calculating the amount of magnetic seed replenishment, which varies depending on the nature of the replenishment.

[0055] When the magnetic seed replenishment amount refers to the amount of magnetic seed that needs to be added within one cycle, and is equal to the amount of magnetic seed loss during that time period; under this condition, the calculation method for the magnetic seed replenishment amount is as follows:

[0056] Let T0 be the amount of magnetic seeds added before the start of a cycle, i.e., the initial amount of magnetic seeds added.

[0057] The total magnetic seed circulation volume is calculated based on the initial magnetic seed addition amount T0 using the following formula.

[0058] T1 = ηT0,

[0059] Where: T1 is the total magnetic seed circulation, and η is the correction coefficient considering the initial magnetic seed deposition;

[0060] The amount of magnetic seed replenishment is then calculated using the following formula.

[0061] T2 = T1 × μ1,

[0062] T2 represents the amount of magnetic seed replenishment.

[0063] When the magnetic seed replenishment amount refers to the amount of magnetic seed that needs to be added from the starting point to any point in time that is greater than one cycle, it is denoted as T3, and the wastewater treatment volume during the time period between the starting point and any point in time is denoted as Q2; where T3 is calculated according to the following formula:

[0064]

[0065] Q1 represents the wastewater treatment volume within a single cycle.

[0066] Optionally, a method for detecting the magnetic seed recovery rate in a magnetic coagulation wastewater purification process further includes calculating the actual magnetic seed recovery rate over a time period from the starting point to any point in time greater than one cycle. This calculation method includes:

[0067] The actual amount of magnetic seeds added during the time period from the starting point to any point in time is denoted as T4.

[0068] The actual magnetic seed recovery rate over the time period from the starting point to any given time point can be calculated using the following formula.

[0069]

[0070] Where Q1 is the wastewater treatment volume within a cycle, Q2 is the wastewater treatment volume within the time period between the starting point and any given time point, T1 is the total magnetic seed circulation volume, and ρ2 is the actual magnetic seed recovery rate within the time period between the starting point and any given time point. By cross-referencing ρ2 and ρ1, the method for calculating the ρ2 value can be used as a method for calculating the magnetic seed recovery rate when the ρ1 value is unavailable.

[0071] Furthermore, existing magnetic coagulation and separation processes, also known as super magnetic separation processes, mostly use magnetic separation drum machines for magnetic seed recovery. The recovered magnetic seeds are typically diluted and prepared into a magnetic seed solution of a certain concentration, which is then circulated and added to the coagulation reaction system. However, existing magnetic coagulation and sedimentation processes often use magnetic seed recovery machines designed and manufactured based on the principle of magnetic separators. The recovered magnetic seeds are not diluted and prepared into a magnetic seed solution before addition; instead, they are directly added to the magnetic coagulation reaction system in a semi-fluid state. Therefore, it is impossible to obtain magnetic seed solution samples for testing, and thus, it is impossible to calculate the magnetic seed recovery rate ρ1 through testing. In this case, the previously calculated ρ2 can also be used as a reference indicator for the magnetic seed recovery rate. Generally speaking, diluting the recovered magnetic seeds into a magnetic seed solution of a certain concentration before addition results in better mixing of the magnetic seeds and wastewater. Furthermore, ρ2 is a magnetic seed recovery rate calculated on-site based on the actual dosage. Obtaining reliable data requires a long period of stable operation, which is inconvenient for acceptance testing. In contrast, the ρ1 value can be obtained through sampling and testing after the system has been debugged and stabilized in the early stages of on-site acceptance. It can serve as the basis for acceptance and the calculation of the amount of magnetic seed to be added during subsequent operation. In the magnetic coagulation purification process, the magnetic seed can be added continuously, but in practice, it is more often added at intervals.

[0072] Regarding the initial dosage of magnetic seed in the magnetic coagulation purification process, during the initial system commissioning, the dosage can be referenced to the suspended solids (SS) concentration of the influent, ranging from 0.5 to 5 times the SS. The specific dosage is determined based on the effluent effect. In the initial stage of magnetic seed addition, a certain amount of magnetic seed will deposit within the system equipment, including the coagulation reaction system, magnetic sedimentation tank, or magnetic separator, without participating in circulation, resulting in initial magnetic seed loss, which will eventually reach equilibrium. After the system stabilizes, magnetic seed loss mainly depends on the loss of magnetic seed with the effluent and sludge. These two aspects of magnetic seed loss determine the amount of magnetic seed replenishment required for system operation, reflecting the system's magnetic seed recovery rate and thus its performance. The performance of the magnetic coagulation system, for the magnetic coagulation sedimentation process, is comprehensively determined by the coagulation effect, magnetic sedimentation effect, and magnetic seed recovery machine performance; for the magnetic coagulation and magnetic separation process, it is comprehensively determined by the coagulation effect, magnetic separator performance, and magnetic seed recovery machine performance. Therefore, the detection and calculation of the magnetic seed recovery rate in the magnetic coagulation purification process is crucial.

[0073] Magnetic coagulation purification processes, including magnetic coagulation sedimentation and magnetic coagulation-magnetic separation processes, have long faced challenges due to the lack of feasible testing and acceptance standards for magnetic seed recovery rates. This has caused difficulties for users in selecting suppliers, on-site commissioning and acceptance, and controlling operating costs. Poor-quality treatment systems have also caused secondary environmental pollution, hindering the further promotion and application of this type of process. The magnetic seed recovery rate testing and calculation method provided by this invention offers users of magnetic coagulation purification processes a basis for on-site assessment and acceptance of magnetic seed recovery rates. It also provides a reference for equipment manufacturers in design, manufacturing, and on-site commissioning, filling a gap in this technological field.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting magnetic seed recovery rate based on magnetic seed solution sampling, characterized in that, This includes a method for calculating the magnetic seed recovery rate, which comprises: At the beginning and end of a magnetic seed cycle, magnetic seed liquid samples are taken from the same magnetic seed liquid injection point of the coagulation reaction system. A magnetic seed cycle refers to the residence time required from the time the wastewater enters the magnetic coagulation system to the time the effluent is discharged when the coagulation reaction system is debugged to a stable operating state. The concentration of suspended solids in the sampled liquid at the starting point is taken as the starting point magnetic seed quantity and denoted as . SS 1 The concentration of suspended solids in the sample at the endpoint is recorded as the endpoint magnetic seed quantity. SS 2 ; The magnetic seed recovery rate is calculated using the following formula: ， in ρ 1 This represents the magnetic seed recovery rate.

2. The method for detecting magnetic seed recovery rate based on magnetic seed solution sampling according to claim 1, characterized in that, It also includes methods for detecting and calculating magnetic seed loss rate. The method for calculating the magnetic seed loss rate is as follows: μ 1 =（1- ρ 1 ）×100%， in μ 1 This represents the magnetic seed loss rate.

3. The method for detecting magnetic seed recovery rate based on magnetic seed solution sampling according to claim 2, characterized in that, It also includes a method for calculating the amount of magnetic seed replenishment per cycle, wherein the amount of magnetic seed replenishment per cycle refers to the amount of magnetic seed that needs to be added within one cycle, which is equal to the amount of magnetic seed loss during that time period; The calculation method for the amount of magnetic seed replenishment includes: Let T0 be the amount of magnetic seeds added before the start of a cycle, i.e., the initial amount of magnetic seeds added. Based on the initial magnetic seed addition amount T 0 The total magnetic seed circulation volume is calculated using the following formula. T 1 =ηT 0 ， in: T 1 It is the total amount of magnetic seed circulation. η To account for the correction factor of the initial magnetic seed deposition; The amount of magnetic seed replenishment is then calculated using the following formula. T 2 = T 1 × μ 1 ， in, T 2 This is the amount of magnetic seed replenishment for a single cycle.

4. The method for detecting magnetic seed recovery rate based on magnetic seed solution sampling according to claim 3, characterized in that, It also includes a method for calculating the amount of magnetic seed replenishment across cycles. The cross-cycle magnetic seed replenishment amount refers to the amount of magnetic seeds that need to be added from the starting point to any point in time that is greater than one magnetic seed cycle, denoted as . T 3 ,Right now T 3 The amount of wastewater treated during the time period between the starting point and any given time point, representing the amount of magnetic seed replenishment across cycles, is denoted as . Q 2 ;in T 3 Calculate using the following formula: ， in Q 1 It is the amount of wastewater treated within a single cycle.

5. The method for detecting magnetic seed recovery rate based on magnetic seed solution sampling according to claim 1, characterized in that, It also includes calculating the actual magnetic seed recovery rate over the time period from the starting point to any given time point, and the calculation method includes: The actual amount of magnetic seeds added during the time period from the starting point to any other time point is denoted as . T 4 ; The actual magnetic seed recovery rate over the time period from the starting point to any given time point can be calculated using the following formula. ， in, Q 1 It refers to the amount of wastewater treated within a single cycle. Q 2 It refers to the amount of wastewater treated within the time period between the starting point and any other point in time. T 1 It is the total amount of magnetic seed circulation in a single cycle. ρ 2 It is the actual magnetic seed recovery rate over the time period from the starting point to any other point in time.

6. The method for detecting magnetic seed recovery rate based on magnetic seed solution sampling according to claim 5, characterized in that, pass ρ 2 and ρ 1 Mutual corroboration ρ 2 The method for calculating the value can be used as a reference in the absence of ρ 1 A method for calculating magnetic seed recovery rate under certain conditions.

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