CN117368413A - Magnetic seed recovery rate detection method based on magnetic seed liquid sampling - Google Patents
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Abstract
The invention relates to the technical field of magnetic coagulation wastewater purification processes, and discloses a magnetic seed recovery rate detection method based on magnetic seed liquid sampling, which comprises a magnetic seed recovery rate detection calculation method, a magnetic seed loss rate detection calculation method and a magnetic seed supplementing amount calculation method, wherein the magnetic seed recovery rate detection method comprises the following steps: respectively sampling magnetic seed liquid at the start point and the end point of a cycle period; taking the suspended matter concentration in the sampling solutions at two time points as the magnetic seed quantity; the recovery rate of the magnetic seeds was calculated from the magnetic seeds at two time points. The invention is used for quantitatively evaluating the recovery rate of the magnetic seeds in the magnetic coagulation wastewater purification process, and provides the basis for design, manufacture, debugging, detection and acceptance for manufacturers, suppliers and users of the magnetic coagulation wastewater purification system.
Description
Technical Field
The invention provides a magnetic seed recovery rate detection method based on magnetic seed liquid sampling, which is used for detecting and calculating the magnetic seed recovery rate of a magnetic coagulation wastewater purification process of preparing magnetic seed liquid with a certain concentration into magnetic seed liquid for cyclic addition, and belongs to the technical field of solid-liquid separation and purification.
Background
In the technical field of solid-liquid separation and wastewater purification, magnetic coagulation sedimentation and magnetic coagulation magnetic separation processes are widely applied in recent years. The magnetic coagulation sedimentation belongs to a loading sedimentation process, and magnetic floccules generated by coagulation reaction have good sedimentation performance by adding magnetic powder with larger specific gravity into sewage, so that the sewage is quickly sedimentation, separation and purification, and the sedimentation efficiency is higher than that of the traditional inclined tube sedimentation, so that the surface load of a sedimentation tank is improved, and the occupation of the sedimentation tank is smaller. The magnetic coagulation magnetic separation process, also called as super magnetic separation process, adds magnetic powder into sewage to make the floccule generated by coagulation reaction have good magnetism, and magnetically adsorbs the floccule by a magnetic separator to quickly separate magnetic floccule sludge in the sewage and purify water. The magnetic floccule sludge separated by the two processes is recycled by a magnetic seed recycling machine, and then is added into a coagulation reaction system for recycling. The recycling and cyclic adding modes of the magnetic seeds comprise two modes: the magnetic seed liquid with certain concentration is prepared after the magnetic seeds are recovered and is circularly added, so that the magnetic seed liquid and the sewage have better mixing effect, and the magnetic seed liquid is more applied in a magnetic coagulation magnetic separation process; the other is that the magnetic seeds are directly and circularly added in a semi-fluid state after being recovered, and the method is more applied to the magnetic coagulation sedimentation process. The magnetic seeds are partially lost in the recycling process, on one hand, the magnetic seeds are lost along with the effluent, on the other hand, the magnetic seeds are lost along with the sludge in the recycling process of the magnetic seed recycling machine, and the sum of the losses of the two aspects is the loss of the magnetic seeds or the loss of the magnetic seeds. The percentage of the magnetic seed loss and the magnetic seed addition is the magnetic seed loss rate. In order to keep the stable performance of the sewage treatment system and ensure that the effluent quality reaches the standard, magnetic powder needs to be continuously or intermittently supplemented so as to compensate the loss of the magnetic powder. The magnetic seed recovery capacity of the system corresponds to the magnetic seed loss, and the index for measuring the magnetic seed recovery capacity of the system is the magnetic seed recovery rate and the percentage of the magnetic seed recovery amount and the magnetic seed addition amount. The larger the magnetic seed loss rate is, the lower the magnetic seed recovery rate of the system is, the larger the amount of the magnetic seed to be supplemented is, and the higher the system operation cost is. On the other hand, the loss of magnetic seeds along with the effluent and the sludge also brings secondary pollution to the environment, so that the loss of the magnetic seeds needs to be controlled to the minimum extent. At present, there is no unified standard for defining and specifically detecting the recovery rate of magnetic seeds, and this situation makes it difficult for manufacturers to accurately evaluate the performance of the magnetic coagulation purification system provided by the manufacturers, and also brings trouble to the acceptance and evaluation work of users, which is a problem to be solved urgently. In engineering practice, a user can judge the magnetic seed recovery capacity and the magnetic seed loss condition of the system according to the magnetic seed supplementing quantity in the long-time system stable operation state, and experience is provided for proper magnetic seed supplementing and operation cost estimation. However, such an empirical acquisition based on the actual amount of addition requires a relatively long time, is difficult to use in the acceptance stage, and is liable to cause disputes between the user and the supplier in the absence of a magnetic seed recovery rate calculation method and unified standards. On the other hand, the magnetic seed content difference of the feed and the discharge of the magnetic seed recovery machine is only inspected through simulation on site, the magnetic seed loss and recovery condition of the magnetic coagulation system in the running process cannot be comprehensively reflected, the simulation system is complex to construct, and the field is difficult to realize.
Disclosure of Invention
Therefore, in order to solve the defects, the invention provides a magnetic seed recovery rate detection method based on magnetic seed liquid sampling, which is used for quantitatively evaluating the magnetic seed recovery rate of a magnetic coagulation wastewater purification process and provides a basis for design, manufacture and debugging detection for manufacturers, suppliers and users of a magnetic coagulation wastewater purification system.
Specifically, a magnetic seed recovery rate detection method based on magnetic seed liquid sampling comprises a detection calculation method of magnetic seed recovery rate, and the calculation method comprises the following steps:
and (3) respectively sampling the magnetic seed liquid at the start point and the end point of a magnetic seed circulation period, namely the residence time required from the sewage entering the magnetic coagulation system to the water outlet of the clear water when the coagulation reaction system is debugged to a stable running state. The magnetic seed liquid is a semi-fluid magnetic seed recovered by the magnetic seed recovery machine, is prepared into liquid with certain concentration through continuous water supplementing, and is circularly added into the coagulation reaction system through the magnetic seed pump at a certain flow, so that the feeding point of the magnetic seed liquid at the front end of the coagulation reaction system, namely the discharge port of the magnetic seed pump is sampled, and the loss condition of the magnetic seed in the magnetic coagulation purification process system and the magnetic seed recovery capability of the system can be comprehensively and completely reflected.
The suspension concentration in the starting sample solution is recorded as the starting magnetic seed quantity as SS 1 The suspension concentration in the end point sampling liquid is recorded as the end point magnetic seed quantity as SS 2 The starting point and the end point magnetic seed quantity reflect the change of the magnetic seed content in the magnetic seed liquid in one magnetic seed circulation period, namely the change of the magnetic seed concentration caused by the loss of the magnetic seeds, so that the ratio reflects the loss degree of the magnetic seeds and the recovery degree of the magnetic seeds;
calculating the recovery rate of the magnetic seeds according to the following formula;
wherein ρ is 1 The recovery rate of the magnetic seeds is achieved.
SS 2 And SS (all-over-all) 1 The smaller the difference, the smaller the loss of the magnetic seeds, and the higher the magnetic seed recovery capability.
Optionally, a magnetic seed recovery rate detection method based on magnetic seed liquid sampling, and also comprises a detection calculation method of magnetic seed loss rate,
the method for detecting and calculating the loss rate of the magnetic seeds comprises the following steps of calculating the loss rate of the magnetic seeds by the following formula;
μ 1 ＝(1-ρ 1 )×100％，
wherein: mu (mu) 1 Is the loss rate of the magnetic seeds.
Optionally, the magnetic seed recovery rate detection method based on magnetic seed liquid sampling further comprises a magnetic seed supplementing amount calculation method, wherein the magnetic seed supplementing amount calculation method is different according to the different manifestations of the magnetic seed supplementing amount.
When the magnetic seed supplementing quantity is the quantity of the magnetic seeds which need to be supplemented and added in one magnetic seed circulation period, the magnetic seed supplementing quantity is equal to the magnetic seed loss quantity in the time period; the method for calculating the magnetic seed supplementing amount under the condition comprises the following steps:
t-shaped memory 0 The initial magnetic seed feeding amount is the magnetic seed feeding amount which is the magnetic seed feeding amount before the start point of one cycle period;
according to the initial magnetic seed adding quantity T 0 The total magnetic seed circulation amount is calculated by the following formula,
T 1 ＝ηT 0 ，
wherein: t (T) 1 The total magnetic seed circulation quantity, eta is a correction coefficient considering initial magnetic seed deposition;
then the magnetic seed supplement quantity is calculated by the following formula,
T 2 ＝T 1 ×μ 1 ，
wherein T is 2 The magnetic seeds are supplemented.
When the magnetic seed replenishment amount is the amount of magnetic seed required to be replenished during any time point from the starting point to more than one cycle period, the magnetic seed replenishment amount is denoted as T 3 The sewage treatment amount in the period between the starting point and any time point is recorded as Q 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 3 Calculated according to the following formula:
wherein Q is 1 Is the sewage treatment capacity in one cycle period.
Optionally, a method for detecting the recovery rate of magnetic seeds in a process of purifying wastewater by magnetic coagulation further comprises the step of calculating the actual recovery rate of the magnetic seeds in a time period from a starting point to any time point more than one cycle period, and the calculating method comprises the following steps:
counting the amount of the magnetic seeds actually added in the time period between the starting point and any time point, and marking as T 4 ；
The true recovery rate of the magnetic seeds in the time period between the starting point and any time point is calculated by the following formula,
wherein Q is 1 Is the sewage treatment capacity in one cycle period, Q 2 Is the sewage treatment amount in the time period between the starting point and any time point, T 1 Is the total magnetic seed circulation quantity in one circulation period, ρ 2 Is the actual recovery rate of the magnetic seeds in the time period between the starting point and any time point. Through ρ 2 And ρ 1 Mutually prove ρ 2 The calculation method of the value can be used as the method without rho 1 And (3) calculating the recovery rate of the magnetic seeds under the condition of the value.
The invention sets a magnetic seed circulation period as the residence time required from the sewage entering the magnetic coagulation system to the clear water discharging, and ignores the time occupied by the magnetic seed recovery link, because the time from the magnetic coagulation reaction to the completion of solid-liquid separation, namely the hydraulic residence time of the system, is far longer than the time of the magnetic seed recovery link, as is known. Of course, the time of the magnetic seed recovery and other links can be counted, and the effectiveness of the invention is not affected.
The invention has the following advantages:
the invention provides a magnetic seed recovery rate detection method, which aims at the situation that recovered semi-fluid magnetic seeds are prepared into magnetic seed liquid with certain concentration for cyclic feeding, namely the recovered semi-fluid magnetic seeds are prepared into liquid with certain concentration through continuous water supplementing, and the liquid is circularly fed into a coagulation reaction system through a magnetic seed pump with certain flow, so that the magnetic seed liquid feeding point at the front end of the coagulation reaction system, namely a discharge hole of the magnetic seed pump, is sampled, the magnetic seed concentration ratio of the starting point and the end point of a cycle period is detected and calculated, and the loss condition of the magnetic seeds in the recycling and cyclic use process of a magnetic coagulation purification process system and the magnetic seed recovery capacity of the system can be comprehensively and completely reflected. The method provides a solution for the quantitative evaluation of the recovery rate of the magnetic seeds of the magnetic coagulation purification process system, and provides the basis for the design and manufacture and the on-site debugging, detection and acceptance for manufacturers, suppliers and users of the magnetic coagulation purification wastewater system.
The detection and calculation method of the magnetic seed recovery rate is based on the stable standard-reaching running state of the system. During the sampling of the magnetic seed liquid, the water supplementing quantity of the magnetic seed and the pumping circulation adding flow of the magnetic seed liquid are required to be continuously stabilized, and meanwhile, the fluctuation of the water quality index of the effluent is controlled as much as possible.
By the method, the defect that a complicated sampling system or device is built by the traditional method can be avoided, the problem that the magnetic powder possibly runs off along with effluent can not be reflected by the recovery capacity of the magnetic seed recovery machine by the traditional method can be overcome, and the magnetic seed recovery rate detection method based on the magnetic seed liquid sampling can more comprehensively reflect the magnetic seed running off and recovery condition of the water treatment system.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting and calculating the recovery rate of magnetic seeds.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, at present, there is no unified standard for defining and specifically detecting the recovery rate of magnetic seeds, and this situation makes it difficult for manufacturers to evaluate the performance of the magnetic coagulation purification system produced and provided by themselves correctly, and also brings trouble to the acceptance and evaluation work of users, which is a problem to be solved urgently. In engineering practice, a user can judge the magnetic seed recovery capacity and the magnetic seed loss condition of the system according to the magnetic seed supplementing quantity in the long-time system stable operation state, and experience is provided for proper magnetic seed supplementing and operation cost estimation. However, such an empirical acquisition based on the actual amount of addition requires a relatively long time, is difficult to use in the acceptance stage, and is liable to cause disputes between the user and the supplier in the absence of a magnetic seed recovery rate calculation method and unified standards.
For the above reasons, as shown in fig. 1, the invention provides a magnetic seed recovery rate detection method for a magnetic coagulation wastewater purification process, which comprises a magnetic seed recovery rate detection calculation method and a magnetic seed loss rate detection calculation method. Firstly, defining the residence time required from the sewage entering the magnetic coagulation system to the water leaving, namely the residence time of the system, namely one cycle period of the magnetic seeds, and recording as t 1 The starting point is time point 1 and the ending point is time point 2. The recovery rate and the loss rate of the magnetic seeds are both that the magnetic seeds are in a cycle period t 1 An index in the interior.
The magnetic seed recovery rate detection and calculation method comprises the following steps:
step S1, debugging the magnetic coagulation purifying system to a stable standard operation state, and recording the total magnetic seed adding amount as T 0 Namely the initial magnetic seed adding amount of the system, including the initial magnetic seed deposition amount and the circulation amount. At t 1 The total magnetic seed circulation in the time period is recorded as T 1 Is T 0 Values obtained after deducting the amount of initially deposited magnetic species in the system:
T 1 ＝ηT 0 ，
where η is a correction factor taking into account initial magnetic seed deposition. η is checked to be 0.5 or adjusted according to engineering experience;
s2, at a time point 1, sampling a certain amount, such as 1L of magnetic seed liquid, at a magnetic seed liquid adding point of a coagulation reaction system, wherein the average can be obtained by three times;
s3, sampling at a magnetic seed liquid adding point of the coagulation reaction system at a time point 2, wherein the magnetic seed liquid with the same volume as that of the previous step can be sampled and averaged for three times;
step S4, carrying out double sampling and inspection in the step S3 and the step S4, respectively detecting the suspended matter concentration of the double sampling according to a suspended matter concentration detection method, and marking the magnetic seed quantity of the time point 1 as SS as the magnetic seed quantity of the double samples 1 The magnetic seed amount at time point 2 was recorded as SS 2 ；
S5, calculating the recovery rate of the magnetic seeds according to the following formula:
in an embodiment, the method for detecting and calculating the loss rate of the magnetic seeds is calculated by the following formula.
μ 1 ＝(1-ρ 1 )×100％，
Wherein: mu (mu) 1 Is the loss rate of the magnetic seeds.
In engineering practice, a user can judge the magnetic seed recovery capacity and the magnetic seed loss condition of the system according to the magnetic seed supplementing quantity in the long-time system stable operation state, and experience is provided for proper magnetic seed supplementing and operation cost estimation. However, such an empirical acquisition based on the actual amount of addition requires a relatively long time, is difficult to use in the acceptance stage, and is liable to cause disputes between the user and the supplier in the absence of a magnetic seed recovery rate calculation method and unified standards. In addition, only the recovery capacity of the magnetic seed recovery machine is considered in engineering practice, so that the recovery rate of the magnetic seeds is judged, the loss situation of the magnetic seeds possibly along with the effluent is neglected, and the total magnetic seed recovery capacity, the magnetic seed loss supplementing quantity and the running cost of the system really concerned by a user cannot be reflected. Based on the situation, in an embodiment, the method for detecting the recovery rate of the magnetic seeds in the process for purifying the wastewater by magnetic coagulation further comprises a method for calculating the supplementing quantity of the magnetic seeds, wherein the calculating method of the supplementing quantity of the magnetic seeds is different according to the different manifestations of the supplementing quantity of the magnetic seeds.
When the magnetic seed supplementing quantity is the magnetic seed quantity required to be supplemented in one cycle period, the magnetic seed supplementing quantity is equal to the magnetic seed loss quantity in the time period; the method for calculating the magnetic seed supplementing amount under the condition comprises the following steps:
t-shaped memory 0 The initial magnetic seed feeding amount is the magnetic seed feeding amount which is the magnetic seed feeding amount before the start point of one cycle period;
according to the initial magnetic seed adding quantity T 0 The total magnetic seed circulation amount is calculated by the following formula,
T 1 ＝ηT 0 ，
wherein: t (T) 1 The total magnetic seed circulation quantity, eta is a correction coefficient considering initial magnetic seed deposition;
then the magnetic seed supplement quantity is calculated by the following formula,
T 2 ＝T 1 ×μ 1 ，
wherein T is 2 The magnetic seeds are supplemented.
When the magnetic seed replenishment amount is the amount of magnetic seed required to be replenished during any time point from the starting point to more than one cycle period, the magnetic seed replenishment amount is denoted as T 3 The sewage treatment amount in the period between the starting point and any time point is recorded as Q 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 3 The method is calculated according to the following formula:
wherein Q is 1 Is the sewage treatment capacity in one cycle period.
Optionally, a method for detecting the recovery rate of magnetic seeds in a process of purifying wastewater by magnetic coagulation further comprises the step of calculating the actual recovery rate of the magnetic seeds in a time period from a starting point to any time point more than one cycle period, and the calculating method comprises the following steps:
counting the amount of the magnetic seeds actually added in the time period between the starting point and any time point, and marking as T 4 ；
The true recovery rate of the magnetic seeds in the time period between the starting point and any time point is calculated by the following formula,
wherein Q is 1 Is the sewage treatment capacity in one cycle period, Q 2 Is the sewage treatment amount in the time period between the starting point and any time point, T 1 Is the total circulation quantity of magnetic seeds, ρ 2 Is the actual recovery rate of the magnetic seeds in the time period between the starting point and any time point. Through ρ 2 And ρ 1 Mutually prove ρ 2 The calculation method of the value can be used as the method without rho 1 And (3) calculating the recovery rate of the magnetic seeds under the condition of the value.
In addition, in the existing magnetic coagulation magnetic separation process, namely the super magnetic separation process, most of the magnetic seed recoverer adopts a magnetic separation magnetic drum machine, the recovered magnetic seed is usually diluted and prepared into a magnetic seed liquid with a certain concentration to be circularly added into a coagulation reaction system, while in the existing magnetic coagulation sedimentation process, most of the magnetic seed recoverer adopts a magnetic seed liquid which is designed and manufactured based on a magnetic separator principle, the recovered magnetic seed is not diluted and prepared into a magnetic seed liquid with a certain concentration to be added, but is directly added into the magnetic coagulation reaction system in a half-flow state after being recovered, so that a magnetic seed liquid sample cannot be obtained to be detected, and therefore, the recovery rate ρ of the magnetic seed cannot be obtained through detection and calculation 1 Values. At this time, ρ obtained by the above calculation 2 Can also be used as a reference index of the recovery rate of the magnetic seeds. In general, the recovered magnetic seeds are diluted to prepare magnetic seed liquid with certain concentration for adding, and the mixing effect of the magnetic seeds and sewage is better. Further, ρ 2 The calculated recovery rate of the magnetic seeds is summarized on site according to the actual addition amount, and long stable operation time is needed for obtaining reliable data and is used for checking and accepting the stage, so that inconvenience is caused. In contrast, ρ 1 The value is at an early stage of field acceptanceThe system can be obtained by sampling, detecting and calculating after debugging and stable operation, and can be used as an acceptance criterion and a calculation criterion of magnetic seed supplementary addition amount in the subsequent operation period. The magnetic seeds can be continuously added in the magnetic coagulation purification process, and more in the engineering, the magnetic seeds are added at intervals.
Aiming at the initial addition amount of magnetic seeds in the magnetic coagulation purification process, the concentration SS of suspended substances in sewage water inlet can be referred in the initial stage of system water-through debugging, the addition amount is 0.5-5 times of the SS, and the specific addition amount is judged according to the water outlet effect. In the initial stage of magnetic seed feeding, a certain amount of magnetic seed is deposited in a system device comprising a coagulation reaction system, a magnetic sedimentation tank or a magnetic separator and does not participate in circulation, so that initial magnetic seed loss is formed, but balance is finally achieved. After the system stably operates, the loss of the magnetic seeds mainly depends on the loss of the magnetic seeds along with the effluent and the sludge, and the magnetic seed loss in the two aspects determines the magnetic seed supplementing quantity required by the system operation, reflects the magnetic seed recovery rate of the system and also reflects the performance of the system. The performance of the magnetic coagulation system is comprehensively determined by the coagulation effect, the magnetic precipitation effect and the performance of a magnetic seed recovery machine in terms of the magnetic coagulation precipitation process; the magnetic coagulation and magnetic separation process is comprehensively determined by coagulation effect, performance of a magnetic separator and performance of a magnetic seed recovery machine. It can be seen that the detection and calculation of the recovery rate of the magnetic seeds in the magnetic coagulation purification process are of great importance.
The magnetic coagulation purification process comprises a magnetic coagulation sedimentation process and a magnetic coagulation magnetic separation process, and because the recovery rate of the magnetic seeds lacks feasible detection acceptance criteria for a long time, the magnetic coagulation purification process causes trouble to users in the aspects of selecting suppliers, field debugging acceptance and operation cost control, and the treatment system with poor quality also causes secondary environmental pollution, thereby influencing the further popularization and application of the process. The magnetic seed recovery rate detection and calculation method provided by the invention provides a field checking and acceptance basis for the magnetic seed recovery rate for the magnetic coagulation purification process user, provides a reference for the design and manufacture of equipment manufacturers and the field debugging, and fills the blank of the process technology.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended 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 (6)
1. The magnetic seed recovery rate detection method based on magnetic seed liquid sampling is characterized by comprising a detection calculation method of magnetic seed recovery rate, and the calculation method comprises the following steps:
respectively sampling magnetic seed liquid at a start point and an end point of a magnetic seed circulation period of the coagulation reaction system, wherein the magnetic seed circulation period refers to the residence time required from the sewage entering the magnetic coagulation system to the water yielding of the clear water when the coagulation reaction system is debugged to a stable running state;
the suspension concentration in the starting sample solution is recorded as the starting magnetic seed quantity as SS 1 The suspension concentration in the end point sampling liquid is recorded as the end point magnetic seed quantity as SS 2 ；
The recovery rate of the magnetic seeds is calculated according to the following formula:
wherein ρ is 1 The recovery rate of the magnetic seeds is achieved.
2. The method for detecting the recovery rate of the magnetic seeds based on the sampling of the magnetic seeds according to claim 1, further comprising a method for detecting and calculating the loss rate of the magnetic seeds,
the method for detecting and calculating the loss rate of the magnetic seeds comprises the following steps of:
μ 1 ＝(1-ρ 1 )×100％，
wherein mu 1 Is the loss rate of the magnetic seeds.
3. The method for detecting the recovery rate of the magnetic seeds based on the sampling of the magnetic seed liquid according to claim 2, which is characterized by further comprising a calculation method of the magnetic seed supplementing amount, wherein the magnetic seed supplementing amount is the amount of the magnetic seeds required to be supplemented in one cycle period and is equal to the magnetic seed loss amount in the time period;
the method for calculating the magnetic seed supplementing amount comprises the following steps:
t-shaped memory 0 The initial magnetic seed feeding amount is the magnetic seed feeding amount which is the magnetic seed feeding amount before the start point of one cycle period;
according to the initial magnetic seed adding quantity T 0 The total magnetic seed circulation amount is calculated by the following formula,
T 1 ＝ηT 0 ，
wherein: t (T) 1 The total magnetic seed circulation quantity, eta is a correction coefficient considering initial magnetic seed deposition; then the magnetic seed supplement quantity is calculated by the following formula,
T 2 ＝T 1 ×μ 1 ，
wherein T is 2 The magnetic seeds are supplemented.
4. The method for detecting the recovery rate of the magnetic seeds based on the sampling of the magnetic seed liquid according to claim 2, further comprising a calculation method of the supplementing amount of the magnetic seeds,
the magnetic seed supplementing amount refers to the amount of magnetic seeds required to be supplemented and added from the starting point to any time point of more than one magnetic seed circulation period, and is recorded as T 3 The sewage treatment amount in the period between the starting point and any time point is recorded as Q 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is 3 The method is calculated according to the following formula:
wherein Q is 1 Is the sewage treatment capacity in one cycle period.
5. The method for detecting magnetic seed recovery rate based on magnetic seed liquid sampling according to claim 1, further comprising calculating actual true magnetic seed recovery rate in a period of time between a starting point and any time point, the method comprising:
counting the amount of the magnetic seeds actually added in the time period between the starting point and any time point, and marking as T 4 ；
The true recovery rate of the magnetic seeds in the time period between the starting point and any time point is calculated by the following formula,
wherein Q is 1 Is the sewage treatment capacity in one cycle period, Q 2 Is the sewage treatment amount in the time period between the starting point and any time point, T 1 Is the total magnetic seed circulation quantity in one circulation period, ρ 2 Is the actual recovery rate of the magnetic seeds in the time period between the starting point and any time point.
6. The method for detecting magnetic seed recovery rate based on magnetic seed liquid sampling according to claim 5, wherein the magnetic seed liquid sampling is performed by ρ 2 And ρ 1 Mutually prove ρ 2 The calculation method of the value can be used as the method without rho 1 And (3) calculating the recovery rate of the magnetic seeds under the condition of the value.
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