Method and system for operating a magnetic coagulation water treatment process system

Abstract

The application discloses a magnetic coagulation water treatment process system operation control method and system, and belongs to the technical field of wastewater treatment system operation control. The steps are as follows: through a flowmeter, a suspended substance monitoring meter and a total phosphorus monitoring meter, the flow and pollutant monitoring data of the magnetic coagulation water treatment process system are acquired; a medicament dosing model of a coagulant, magnetic powder and flocculant, and a reflux magnetic sludge flow calculation model and a residual magnetic sludge flow calculation model are constructed; a total phosphorus content change gradient of influent, a suspended substance content change gradient of influent and an influent flow change gradient are set; the coagulant, magnetic powder and flocculant are controlled to be dosed; and the operation frequency of a reflux sludge pump and a residual sludge pump is controlled through the reflux magnetic sludge flow and the residual magnetic sludge flow respectively, so that the operation control of the magnetic coagulation water treatment process system is completed. The application realizes automatic control and adjustment of the magnetic coagulation water treatment system, and solves the problems that the magnetic coagulation water treatment engineering is difficult to realize self-control and unattended.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment system operation control technology, and particularly relates to an operation control method and system for a magnetic coagulation water treatment process system. Background Technology

[0002] Magnetic coagulation water treatment technology, as a deep water purification technology, features simple process, small equipment footprint, large treatment capacity, strong resistance to shock loads, low operating cost, long equipment service life, and stable effluent quality meeting or higher Class A standards. Magnetic coagulation water treatment technology is increasingly attracting widespread attention in the industry and is being increasingly applied in areas such as wastewater treatment plant upgrading, deep phosphorus removal from wastewater, heavy metal wastewater treatment, and black and odorous river remediation. As a sedimentation process using magnetic powder as the loading medium, magnetic coagulation water treatment technology differs significantly from traditional high-density sedimentation in terms of operation and maintenance: for example, high-density sedimentation can achieve automatic sludge removal by detecting the sludge layer height in the sedimentation tank, but magnetic coagulation sedimentation tanks cannot automatically remove sludge because the sludge height cannot be detected; the dosage, dosing point, stirring conditions, and residual (magnetic) sludge flow rate also differ significantly between the two; high-density sedimentation has accumulated decades or even centuries of operational experience, while magnetic coagulation technology has been applied in engineering projects for less than ten years, and is still a new technology for many engineering operators. Although magnetic coagulation water treatment technology has significant advantages over high-density sedimentation technology, its widespread application has been greatly restricted.

[0003] Currently, the operation and control methods of high-density sedimentation water treatment processes have only reached the level of intelligence. For example, some cameras are installed on site, which can only observe the on-site situation and lack control methods that can automatically adjust the operating status. Summary of the Invention

[0004] To address the aforementioned shortcomings in existing technologies, this invention provides a method and system for controlling the operation of a magnetic coagulation water treatment process system. Based on changes in influent and effluent water volume and quality, the system automatically controls the dosing of chemicals and the operating frequencies of the return sludge pump and the excess sludge pump, thereby achieving automatic control and adjustment of the magnetic coagulation water treatment system. This solves the problem that magnetic coagulation water treatment projects are difficult to automate and operate without human intervention.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] On the one hand, the present invention provides an operation control method for a magnetic coagulation water treatment process system, comprising the following steps:

[0007] S1. Obtain flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors;

[0008] S2. Based on the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system, construct the agent dosing model for coagulant, magnetic powder and flocculant, as well as the flow rate calculation model for return magnetic mud and the flow rate calculation model for residual magnetic mud.

[0009] S3. Set the gradient for changes in total phosphorus content, influent flow rate, and influent suspended solids content;

[0010] S4. Based on the gradient of changes in total phosphorus content, suspended solids content, and flow rate of the influent, control the addition of coagulants, magnetic powder, and flocculants according to the dosing model of coagulants, magnetic powder, and flocculants.

[0011] S5. Based on the calculation models of return magnetic mud flow rate and residual magnetic mud flow rate, the operating frequencies of the return sludge pump and the residual sludge pump are controlled by the return magnetic mud flow rate and the residual magnetic mud flow rate, respectively, to complete the operation control of the magnetic coagulation water treatment process system.

[0012] The beneficial effects of this invention are as follows: This invention provides an operation control method for a magnetic coagulation water treatment process system. By acquiring the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system, it constructs a dosing model for coagulants, magnetic powder, and flocculants, as well as a calculation model for the flow rate of return magnetic mud and the flow rate of residual magnetic mud. The dosing model for coagulants, magnetic powder, and flocculants can accurately calculate the amount of coagulants and flocculants to be added, as well as the amount of magnetic powder to be replenished. The calculation models for the flow rate of return magnetic mud and residual magnetic mud can accurately calculate the flow rates of return magnetic mud and residual magnetic mud. Based on the flow rates of return magnetic mud and residual magnetic mud, the operating frequency of return sludge pumps and residual sludge pumps can be controlled. This invention achieves accurate calculation and dosing of reagents, ensuring that the effluent meets the standards while avoiding reagent waste and power consumption waste of return sludge pumps and residual sludge pumps. It can realize the self-control and unattended operation of magnetic coagulation water treatment projects.

[0013] Further, step S1 includes the following steps:

[0014] S11. Based on the flow meter installed at the inlet of the magnetic coagulation water treatment process system, obtain the real-time inlet flow of the magnetic coagulation water treatment process system.

[0015] S12. Based on the suspended solids monitors installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time suspended solids content of the inlet and outlet of the magnetic coagulation water treatment process system is obtained respectively.

[0016] S13. Based on the total phosphorus monitoring meters installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time total phosphorus content of the influent and the total phosphorus content of the effluent of the magnetic coagulation water treatment process system are obtained respectively.

[0017] S14. Based on the suspended solids monitor installed in the flocculation reaction tank of the magnetic coagulation water treatment process system, the real-time suspended solids content in the flocculation reaction tank is obtained.

[0018] S15. The real-time influent flow rate, influent suspended solids content, effluent suspended solids content, influent total phosphorus content, effluent total phosphorus content, and suspended solids content in the flocculation reaction tank of the magnetic coagulation water treatment process system shall be used as the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system.

[0019] The beneficial effects of adopting the above-mentioned further solutions are as follows: This invention monitors the influent flow rate, influent suspended solids content, effluent suspended solids content, influent total phosphorus content, and effluent total phosphorus content by installing flow meters, suspended solids monitors, and total phosphorus monitors at the inlet and outlet. It also monitors the suspended solids content in the flocculation reaction tank by installing a suspended solids monitor in the flocculation reaction tank. This provides a data basis for achieving precise reagent dosing and pump operating frequency control through reagent dosing models, reflux magnetic mud flow calculation models, and residual magnetic mud flow calculation models.

[0020] Furthermore, the calculation expression for the agent dosing model of the coagulant in S2 is as follows:

[0021]

[0022]

[0023] ΔTSS=(S1-S2)+σ TSS (P1-P2)

[0024] Among them, Q coa σ represents the amount of coagulant added. coa The values ​​represent the relative coefficient of the coagulant, Q represents the real-time influent flow rate, n represents the dosage multiplier, P1 represents the real-time total phosphorus content of the influent, P2 represents the real-time total phosphorus content of the effluent, N represents the content of the effective component of the coagulant raw material, and C1 represents the concentration of the coagulant raw material. coagulant ΔTSS represents the amount of coagulant used in the coagulation reaction, S1 represents the real-time suspended solids content to be removed, S2 represents the real-time suspended solids content in the influent, and σ represents the real-time suspended solids content in the effluent. TSS This represents the suspended solids coefficient.

[0025] The beneficial effects of adopting the above-mentioned further scheme are as follows: This invention provides a calculation method for the dosage model of coagulants. By using real-time influent flow rate, real-time influent total phosphorus content, real-time effluent total phosphorus content, coagulant raw material effective ingredient content, real-time influent suspended solids content, and real-time effluent suspended solids content, combined with coagulant dosage, effective ingredient content, and dosage ratio, the accurate calculation of coagulant dosage is achieved, providing a foundation for effective control of effluent quality.

[0026] Furthermore, the calculation expression for the reagent dosing model of magnetic powder in S2 is as follows:

[0027] M supplement =C3·Q / 1000

[0028] Among them, M supplement C3 represents the amount of magnetic powder added, C3 represents the amount of magnetic powder lost, and Q represents the real-time influent flow rate.

[0029] The beneficial effects of adopting the above-mentioned further solution are as follows: This invention provides a calculation method for the reagent addition model of magnetic powder, which realizes the accurate calculation of the reagent replenishment amount of magnetic powder through real-time influent flow rate, and provides a basis for effective control of effluent quality.

[0030] Furthermore, the calculation expression for the flocculant dosage model in S2 is as follows:

[0031]

[0032] ΔTSS=(S1-S2)+σ TSS (P1-P2)

[0033] Among them, Q flo σ represents the flocculant dosage, Q represents the real-time influent flow rate, ΔTSS represents the real-time suspended solids content to be removed, C2 represents the flocculant concentrate concentration, S1 represents the real-time influent suspended solids content, S2 represents the real-time effluent suspended solids content, and σ represents the flocculant dosage. TSS P1 represents the suspended solids coefficient, P2 represents the real-time total phosphorus content of the influent, and P3 represents the real-time total phosphorus content of the effluent.

[0034] The beneficial effects of adopting the above-mentioned further scheme are as follows: This invention provides a calculation method for the flocculant dosage model. By using real-time influent flow rate, real-time influent suspended solids content, real-time effluent suspended solids content, real-time influent total phosphorus content, and real-time effluent total phosphorus content, the accurate calculation of flocculant dosage is achieved, providing a basis for effective control of effluent quality.

[0035] Furthermore, the calculation expressions for the return magnetic mud flow rate calculation model and the residual magnetic mud flow rate calculation model in S2 are as follows:

[0036]

[0037]

[0038] Among them, Flow rf S1 represents the flow rate of the return magnetic sludge, Q represents the real-time influent flow rate, M represents the real-time suspended solids content in the flocculation reactor, S2 represents the real-time suspended solids content in the effluent, S3 represents the suspended solids content in the return sludge, n' represents the mass ratio of magnetic powder to suspended solids in the flocculation reactor, S1 represents the real-time suspended solids content in the influent, P1 represents the real-time total phosphorus content in the influent, P2 represents the real-time total phosphorus content in the effluent, α represents the chemical oxygen demand removal rate, and C represents the real-time suspended solids content in the effluent. COD The flow rate represents the chemical oxygen demand (COD) content in the influent, m represents the maximum loss of magnetic powder, and Flow is the flow rate. su This indicates the remaining magnetic mud flow rate.

[0039] The beneficial effects of adopting the above-mentioned further scheme are as follows: This invention provides a calculation method for the return magnetic mud flow rate calculation model and the residual magnetic mud flow rate calculation model. By using real-time influent flow rate, real-time suspended solids content in the flocculation reaction tank, real-time effluent suspended solids content, real-time influent suspended solids content, real-time influent total phosphorus content, and real-time effluent total phosphorus content, combined with the suspended solids content in the return sludge, the mass ratio of magnetic powder to suspended solids in the flocculation reaction tank, the chemical oxygen demand removal rate, and the chemical oxygen demand content in the influent, the return magnetic mud flow rate and the residual magnetic mud flow rate are accurately calculated, providing a foundation for the effective control of effluent quality.

[0040] Furthermore, in S3, the range of the gradient values ​​for the total phosphorus content variation in the influent is 5% to 10%, the range of the gradient values ​​for the influent flow rate variation is 5% to 10%, and the range of the gradient values ​​for the influent suspended solids content variation is 5%. The optimal values ​​for the gradient values ​​for the total phosphorus content variation, the influent flow rate variation, and the influent suspended solids content variation are all 5%.

[0041] The beneficial effects of adopting the above-mentioned further solutions are as follows: The present invention provides preset value ranges and optimal preset values ​​for the gradient of changes in total phosphorus content, suspended solids content, and flow rate of influent, providing a basis for judgment for real-time and accurate control of the addition of magnetic coagulation water treatment agents such as coagulants, magnetic powder, and flocculants, and ensuring the accuracy of agent addition when unattended.

[0042] Further, step S4 includes the following steps:

[0043] S41. Obtain the real-time total phosphorus content of the influent and, in conjunction with the initial total phosphorus content of the influent, obtain the change value of the total phosphorus content of the influent.

[0044] S42. Determine whether the change in total phosphorus content in the influent exceeds the gradient of total phosphorus content change in the influent. If yes, proceed to S43; otherwise, proceed to S44.

[0045] S43. Based on the real-time total phosphorus content of the influent, control the addition of coagulant according to the coagulant dosing model;

[0046] S44. Obtain the real-time influent flow rate and combine it with the initial influent flow rate to obtain the influent flow rate change value;

[0047] S45. Determine whether the change in influent flow rate exceeds the gradient of influent flow rate change. If so, proceed to S46; otherwise, proceed to S47.

[0048] S46. Based on the real-time influent flow rate and the reagent dosing model of magnetic powder, control the addition of magnetic powder;

[0049] S47. Obtain the real-time suspended solids content in the influent and, in conjunction with the initial suspended solids content in the influent, obtain the change value of the suspended solids content in the influent.

[0050] S48. Determine whether the change in the suspended solids content of the influent exceeds the gradient of the change in the suspended solids content of the influent. If yes, proceed to S49; otherwise, proceed to S5.

[0051] S49. Based on the real-time suspended solids content of the influent and the flocculant dosing model, control the flocculant dosage.

[0052] The beneficial effects of adopting the above-mentioned further solution are as follows: This invention provides a method for adding magnetic coagulation water treatment agents based on the control judgment criteria of the gradient of total phosphorus content, the gradient of suspended solids content, and the gradient of influent flow rate, and the precise value of agent dosage calculated based on the agent addition model of coagulant, magnetic powder, and flocculant. This method can achieve accurate addition of magnetic coagulation water treatment agents without human intervention and avoid agent waste.

[0053] Further, step S5 includes the following steps:

[0054] S51. Obtain the real-time suspended solids content in the flocculation reaction tank;

[0055] S52. Based on the real-time suspended solids content in the flocculation reaction tank, the flow rate of the reflux magnetic mud is calculated using the reflux magnetic mud flow rate calculation model.

[0056] S53. Based on the real-time suspended solids content in the flocculation reaction tank, the residual magnetic mud flow rate is calculated using the residual magnetic mud flow rate calculation model.

[0057] S54. Based on the return magnetic mud flow rate and the residual magnetic mud flow rate, control the operating frequency of the return sludge pump and the residual sludge pump respectively to complete the operation control of the magnetic coagulation water treatment process system.

[0058] The calculation expressions for the operating frequencies of the return sludge pump and the excess sludge pump are as follows:

[0059]

[0060]

[0061] Among them, f rf Indicates the operating frequency of the return sludge pump, Flow rf Indicates the flow rate of the reflux magnetic mud. rfpum This indicates the rated flow rate of the sludge return pump, f. su Indicates the operating frequency of the waste sludge pump, Flow su Flow represents the remaining magnetic mud flow rate. supum This indicates the rated flow rate of the residual sludge pump.

[0062] The beneficial effects of adopting the above-mentioned further solution are as follows: This invention provides a method for calculating the flow rate of reflux magnetic mud and the flow rate of residual magnetic mud based on the real-time suspended solids content in the flocculation reaction tank and the calculation model of reflux magnetic mud flow rate and residual magnetic mud flow rate. By controlling the operating frequency of the reflux sludge pump and the residual sludge pump, the required reflux magnetic mud flow rate and residual magnetic mud flow rate can be directly obtained to ensure the quality of effluent.

[0063] On the other hand, the present invention also provides a system based on the operation control method of a magnetic coagulation water treatment process system, comprising:

[0064] The data acquisition module is used to acquire flow and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors;

[0065] The model building module is used to build agent dosing models for coagulants, magnetic powders and flocculants, as well as return magnetic mud flow calculation models and residual magnetic mud flow calculation models based on the flow and pollutant monitoring data of the magnetic coagulation water treatment process system.

[0066] The gradient setting module is used to set the gradient for changes in total phosphorus content, suspended solids content, and flow rate of the influent.

[0067] The chemical dosing control module is used to control the dosing of coagulants, magnetic powders, and flocculants based on the chemical dosing models of coagulants, magnetic powders, and flocculants, according to the gradients of changes in total phosphorus content, suspended solids content, and flow rate of the influent.

[0068] The magnetic mud flow control module is used to control the operating frequency of the return sludge pump and the residual sludge pump based on the return magnetic mud flow calculation model and the residual magnetic mud flow calculation model, respectively.

[0069] The storage monitoring module is used to monitor the dosage and residual amount of coagulant, magnetic powder and flocculant, and to issue a warning when the residual amount is lower than the preset residual threshold of coagulant, magnetic powder and flocculant.

[0070] The data storage module is used to store the flow and pollutant monitoring data of the magnetic coagulation water treatment process system, the dosage of coagulant and flocculant, the amount of magnetic powder added, the flow rate of return magnetic mud, the flow rate of residual magnetic mud, and the operating frequency of return sludge pump and residual sludge pump to the local database and simultaneously store them to the cloud.

[0071] The beneficial effects of this invention are as follows: This invention is a system corresponding to the above-mentioned magnetic coagulation water treatment process system operation control method, used to implement the above method, and the effects that can be achieved are the same as those that can be achieved by the above method. In addition, this system can also store the collected flow rate and pollutant monitoring data, as well as the data generated during the operation control process, such as the dosage of coagulant and flocculant, the amount of magnetic powder added, the flow rate of return magnetic mud, the flow rate of residual magnetic mud, and the operating frequency of return sludge pump and residual sludge pump. It can also monitor the dosage and remaining amount of coagulant, magnetic powder and flocculant, realize real-time early warning of insufficient remaining amount, and ensure that the unattended system can always operate normally under the condition of sufficient reagent supply.

[0072] Coagulant dosage Q coa The unit is L / h, and the unit of the real-time influent flow rate Q is m³ / h. 3 / h, the real-time influent total phosphorus content P1 is expressed in g / m³. 3 The real-time total phosphorus content (P2) in the effluent is expressed in g / m³. 3 The effective ingredient content N of the coagulant raw material is expressed as a percentage. The unit of the concentration C1 of the coagulant raw material is g / L. The amount of coagulant Q participating in the coagulation reaction is... coagulant The unit is L / h, and the unit for the real-time suspended solids content to be removed ΔTSS is g / m³. 3 The real-time influent suspended solids content S1 is expressed in g / m³. 3 The unit for the real-time suspended solids content S2 in the effluent is: g / m³ 3 Magnetic powder replenishment amount M supplement The unit is kg / h, and the unit for magnetic particle loss C3 is g / m³. 3 Flocculant dosage Q flo The unit is L / h, the unit of flocculant stock concentration C2 is g / L, and the flow rate of the reflux magnetic mud is...rf The unit is: m 3 / h, the unit of suspended solids content M in the real-time flocculation reaction tank is: g / m³ 3 The unit for the suspended solids content S3 in the returned sludge is kg / m³. 3 The unit for the chemical oxygen demand (COD) content in the influent is g / m³. 3 The unit of the maximum magnetic particle loss m is g / m. 3 Residual magnetic mud flow rate su The unit is m 3 / h.

[0073] Other advantages of the present invention will be analyzed in more detail in the following embodiments. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1 This is a flowchart of the operation control method of a magnetic coagulation water treatment process system in Embodiment 1 of the present invention.

[0076] Figure 2 This is a block diagram of a system operation control method based on magnetic coagulation water treatment process in Embodiment 2 of the present invention. Detailed Implementation

[0077] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0078] Example 1:

[0079] like Figure 1 As shown, in one embodiment of the present invention, the present invention provides a method for controlling the operation of a magnetic coagulation water treatment process system, comprising the following steps:

[0080] S1. Obtain flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors;

[0081] S1 includes the following steps:

[0082] S11. Based on the flow meter installed at the inlet of the magnetic coagulation water treatment process system, obtain the real-time inlet flow of the magnetic coagulation water treatment process system.

[0083] S12. Based on the suspended solids monitors installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time suspended solids content of the inlet and outlet of the magnetic coagulation water treatment process system is obtained respectively.

[0084] S13. Based on the total phosphorus monitoring meters installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time total phosphorus content of the influent and the total phosphorus content of the effluent of the magnetic coagulation water treatment process system are obtained respectively.

[0085] S14. Based on the suspended solids monitor installed in the flocculation reaction tank of the magnetic coagulation water treatment process system, the real-time suspended solids content in the flocculation reaction tank is obtained.

[0086] S15. The real-time influent flow rate, influent suspended solids content, effluent suspended solids content, influent total phosphorus content, effluent total phosphorus content, and suspended solids content in the flocculation reaction tank of the magnetic coagulation water treatment process system shall be used as the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system.

[0087] S2. Based on the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system, construct the agent dosing model for coagulant, magnetic powder and flocculant, as well as the flow rate calculation model for return magnetic mud and the flow rate calculation model for residual magnetic mud.

[0088] The calculation expression for the agent dosing model of the coagulant in S2 is as follows:

[0089]

[0090]

[0091] ΔTSS=(S1-S2)+σ TSS (P1-P2)

[0092] Among them, Q coa σ represents the amount of coagulant added. coa The values ​​represent the relative coefficient of the coagulant, Q represents the real-time influent flow rate, n represents the dosage multiplier, P1 represents the real-time total phosphorus content of the influent, P2 represents the real-time total phosphorus content of the effluent, N represents the content of the effective component of the coagulant raw material, and C1 represents the concentration of the coagulant raw material. coagulantΔTSS represents the amount of coagulant used in the coagulation reaction, S1 represents the real-time suspended solids content to be removed, S2 represents the real-time suspended solids content in the influent, and σ represents the real-time suspended solids content in the effluent. TSS This represents the suspended solids coefficient. Preferably, in this embodiment, the dosage multiplier n ranges from 1.5 to 3. If the coagulant is polyaluminum chloride (PAC), the relative coefficient of the coagulant σ is... coa Take 1.65, suspension coefficient σ TSS Take 3.41; if the coagulant is polyferric chloride (PFS), the relative coefficient of the coagulant σ is... coa Take 5.24, suspension coefficient σ TSS Take 4.87.

[0093] The calculation expression for the magnetic powder dosing model in S2 is as follows:

[0094] M supplement =C3·Q / 1000

[0095] Among them, M supplement C3 represents the amount of magnetic powder added, Q represents the amount of magnetic powder lost, and C3 represents the real-time influent flow rate. Preferably, in this embodiment, the value of the magnetic powder loss C3 ranges from 2 to 5 g / m³. 3 .

[0096] The calculation expression for the flocculant dosing model in S2 is as follows:

[0097]

[0098] ΔTSS=(S1-S2)+σ TSS (P1-P2)

[0099] Among them, Q flo σ represents the flocculant dosage, Q represents the real-time influent flow rate, ΔTSS represents the real-time suspended solids content to be removed, C2 represents the flocculant concentrate concentration, S1 represents the real-time influent suspended solids content, S2 represents the real-time effluent suspended solids content, and σ represents the flocculant dosage. TSS The suspended solids coefficient σ represents the real-time total phosphorus content of the influent and the real-time total phosphorus content of the effluent. In this embodiment, polyacrylamide (PAM) is used as the flocculant. If polyaluminum chloride (PAC) is used as the coagulant, the suspended solids coefficient σ is... TSS Take 3.41; if the coagulant is polyferric chloride (PFS), the suspension coefficient σ TSS Take 4.87.

[0100] The calculation expressions for the return magnetic mud flow rate calculation model and the residual magnetic mud flow rate calculation model in S2 are as follows:

[0101]

[0102]

[0103] Among them, Flow rf S1 represents the flow rate of the return magnetic sludge, Q represents the real-time influent flow rate, M represents the real-time suspended solids content in the flocculation reactor, S2 represents the real-time suspended solids content in the effluent, S3 represents the suspended solids content in the return sludge, n' represents the mass ratio of magnetic powder to suspended solids in the flocculation reactor, S1 represents the real-time suspended solids content in the influent, P1 represents the real-time total phosphorus content in the influent, P2 represents the real-time total phosphorus content in the effluent, α represents the chemical oxygen demand removal rate, and C represents the real-time suspended solids content in the effluent. COD The flow rate represents the chemical oxygen demand (COD) content in the influent, m represents the maximum loss of magnetic powder, and Flow is the flow rate. su This indicates the residual magnetic sludge flow rate; preferably, in this embodiment, the suspended solids content in the return sludge is 40–60 kg / m³. 3 The suspended solids content in the flocculation reaction tank ranges from 3×10⁻⁶. 3 g / m 3 ~6×10 3 g / m 3 The mass ratio n' of magnetic powder to suspended solids in the flocculation reaction tank ranges from 2 to 3.5, the chemical oxygen demand removal rate α is 0.2 to 0.3, and the maximum loss of magnetic powder is 5 g / m³. 3 .

[0104] S3. Set the gradient for changes in total phosphorus content, influent flow rate, and influent suspended solids content;

[0105] The values ​​for the influent total phosphorus content variation gradient, the influent flow rate variation gradient, and the influent suspended solids content variation gradient set in S3 are all within the range of 5% to 10%. The optimal values ​​for the influent total phosphorus content variation gradient are 5%, 10%, and 10%, respectively. In this embodiment, it is preferred that the influent total phosphorus content variation gradient is 5%, the influent flow rate variation gradient is 10%, and the influent suspended solids content variation gradient is 10%.

[0106] S4. Based on the gradient of changes in total phosphorus content, suspended solids content, and flow rate of the influent, control the addition of coagulants, magnetic powder, and flocculants according to the dosing model of coagulants, magnetic powder, and flocculants.

[0107] S4 includes the following steps:

[0108] S41. Obtain the real-time total phosphorus content of the influent and, in conjunction with the initial total phosphorus content of the influent, obtain the change value of the total phosphorus content of the influent.

[0109] S42. Determine whether the change in total phosphorus content in the influent exceeds the gradient of total phosphorus content change in the influent. If so, proceed to S43; otherwise, proceed to S44. In this embodiment, the added coagulant is controlled to be polyaluminum chloride or polyferric chloride.

[0110] S43. Based on the real-time total phosphorus content of the influent, control the addition of coagulant according to the coagulant dosing model;

[0111] In this embodiment, if the inflow rate of a certain project is 400m³, 3 / h, total phosphorus content is 3×10 -3 kg / m 3 The total phosphorus content in the influent is 1.2 kg / h. When the change in influent flow rate or total phosphorus content causes the total phosphorus content in the influent to change by more than 5%, i.e. 0.06 kg / h, the system will automatically adjust the dosage of polyaluminum chloride or polyferric chloride.

[0112] S44. Obtain the real-time influent flow rate and combine it with the initial influent flow rate to obtain the influent flow rate change value;

[0113] S45. Determine whether the change in influent flow rate exceeds the gradient of influent flow rate change. If so, proceed to S46; otherwise, proceed to S47.

[0114] S46. Based on the real-time influent flow rate and the reagent dosing model of magnetic powder, control the addition of magnetic powder;

[0115] In this embodiment, the magnetic powder dosage is based on a 10% gradient in the influent flow rate. That is, if the change in influent flow rate exceeds 10%, the system will automatically adjust the magnetic powder dosage.

[0116] S47. Obtain the real-time suspended solids content in the influent and, in conjunction with the initial suspended solids content in the influent, obtain the change value of the suspended solids content in the influent.

[0117] S48. Determine whether the change value of the suspended solids content in the influent exceeds the gradient of the change value of the suspended solids content in the influent. If yes, proceed to S49; otherwise, proceed to S5. In this embodiment, the flocculant added is controlled to be polyacrylamide.

[0118] S49. Based on the real-time suspended solids content of the influent and the flocculant dosing model, control the flocculant dosage.

[0119] In this embodiment, the dosage of polyacrylamide is adjusted based on a 10% gradient in the amount of suspended solids (including those produced during phosphorus removal) in the influent. That is, if the total amount of suspended solids in the influent changes by more than 10%, the system will automatically adjust the dosage of polyacrylamide.

[0120] S5. Based on the calculation models of return magnetic mud flow rate and residual magnetic mud flow rate, the operating frequency of the return sludge pump and the residual sludge pump is controlled by the return magnetic mud flow rate and the residual magnetic mud flow rate, respectively, to complete the operation control of the magnetic coagulation water treatment process system.

[0121] S5 includes the following steps:

[0122] S51. Obtain the real-time suspended solids content in the flocculation reaction tank;

[0123] S52. Based on the real-time suspended solids content in the flocculation reaction tank, the flow rate of the reflux magnetic mud is calculated using the reflux magnetic mud flow rate calculation model.

[0124] S53. Based on the real-time suspended solids content in the flocculation reaction tank, the residual magnetic mud flow rate is calculated using the residual magnetic mud flow rate calculation model.

[0125] S54. Based on the return magnetic mud flow rate and the residual magnetic mud flow rate, control the operating frequency of the return sludge pump and the residual sludge pump respectively to complete the operation control of the magnetic coagulation water treatment process system.

[0126] The calculation expressions for the operating frequencies of the return sludge pump and the excess sludge pump are as follows:

[0127]

[0128]

[0129] Among them, f rf Indicates the operating frequency of the return sludge pump, Flow rf Indicates the flow rate of the reflux magnetic mud. rfpum This indicates the rated flow rate of the sludge return pump, f. su Indicates the operating frequency of the waste sludge pump, Flow su Flow represents the remaining magnetic mud flow rate. supum This indicates the rated flow rate of the residual sludge pump.

[0130] In a practical example of this invention, namely a water ecological restoration project in Huzhou, Zhejiang Province, the designed treatment capacity is 1700 m³. 3 / h, with a dosing ratio n of 1.5, and a designed influent suspended solids and total phosphorus content of 150g / m³. 3 3g / m 3 The designed effluent suspended solids and total phosphorus content are 10 g / m³. 3 0.5g / m 3 The project employs integrated magnetic coagulation water treatment technology equipment (2×20,000 cubic meters / day) combined with the magnetic coagulation water treatment process system operation control method provided by this invention for phosphorus removal and turbidity reduction. Randomly selected single-system operating parameters are shown in Table 1.

[0131] Table 1

[0132]

[0133]

[0134] In Table 1, SS represents suspended solids, TP represents total phosphorus, PAC represents polyaluminum chloride, and PAM represents polyacrylamide. Table 1 shows that the error between randomly selected single-system operating data and the corresponding design values ​​is within 8%, which basically matches the relevant characteristics of the magnetic coagulation water treatment process system operation control method provided by this invention regarding the dosage of coagulant, magnetic powder, and flocculant, as well as the control of the operating frequency of the return sludge pump and the waste sludge pump.

[0135] In another practical example of the present invention, namely a decentralized water treatment project in a sluice gate river in Wuhan, Hubei Province, the designed treatment capacity is 4200 m³. 3 / h, with a dosing ratio n of 1.5 times, and the designed influent suspended solids and total phosphorus content are 40g / m³. 3 1.5g / m 3 The designed effluent suspended solids and total phosphorus content are 8g / m³. 3 0.3g / m 3 Similarly, using integrated magnetic coagulation water treatment technology equipment (4×25,000 cubic meters / day) and the magnetic coagulation water treatment process system operation control method provided by this invention, phosphorus removal and turbidity reduction deep treatment were carried out. Randomly selected single system operating parameters are shown in Table 2:

[0136] Table 2

[0137]

[0138]

[0139] Table 2 shows that the error between the randomly selected single system operation data and the corresponding design value is within 8%, which is basically consistent with the relevant characteristics of the magnetic coagulation water treatment process system operation control method provided by this invention regarding the dosage of coagulant, magnetic powder and flocculant, as well as the control of the operating frequency of the return sludge pump and the waste sludge pump.

[0140] Example 2:

[0141] like Figure 2 As shown, on the other hand, based on Embodiment 1, in another embodiment of the present invention, the present invention proposes a system based on a magnetic coagulation water treatment process system operation control method, comprising:

[0142] The data acquisition module is used to acquire flow and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors;

[0143] The model building module is used to build agent dosing models for coagulants, magnetic powders and flocculants, as well as return magnetic mud flow calculation models and residual magnetic mud flow calculation models based on the flow and pollutant monitoring data of the magnetic coagulation water treatment process system.

[0144] The gradient setting module is used to set the gradient for changes in total phosphorus content, suspended solids content, and flow rate of the influent.

[0145] The chemical dosing control module is used to control the dosing of coagulants, magnetic powders, and flocculants based on the chemical dosing models of coagulants, magnetic powders, and flocculants, according to the gradients of changes in total phosphorus content, suspended solids content, and flow rate of the influent.

[0146] The magnetic mud flow control module is used to control the operating frequency of the return sludge pump and the residual sludge pump based on the return magnetic mud flow calculation model and the residual magnetic mud flow calculation model, respectively.

[0147] The storage monitoring module is used to monitor the dosage and residual amount of coagulant, magnetic powder and flocculant, and to issue a warning when the residual amount is lower than the preset residual threshold of coagulant, magnetic powder and flocculant.

[0148] The data storage module is used to store the flow and pollutant monitoring data of the magnetic coagulation water treatment process system, the dosage of coagulant and flocculant, the amount of magnetic powder added, the flow rate of return magnetic mud, the flow rate of residual magnetic mud, and the operating frequency of return sludge pump and residual sludge pump to the local database and simultaneously store them to the cloud.

[0149] The module provided by the present invention, which is based on the operation control method of magnetic coagulation water treatment process system, can be modularly connected or replaced with the original control system of water treatment equipment, and can also be selected and equipped according to user needs and actual working conditions.

[0150] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the operation of a magnetic coagulation water treatment process system, characterized in that, Includes the following steps: S1. Obtain flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors; S2. Based on the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system, construct the agent dosing model for coagulant, magnetic powder and flocculant, as well as the flow rate calculation model for return magnetic mud and the flow rate calculation model for residual magnetic mud. S3. Set the gradient for changes in total phosphorus content, influent flow rate, and influent suspended solids content; S4. Based on the gradient of changes in total phosphorus content, suspended solids content, and flow rate of the influent, control the addition of coagulants, magnetic powder, and flocculants according to the dosing model of coagulants, magnetic powder, and flocculants. S5. Based on the calculation models of return magnetic mud flow rate and residual magnetic mud flow rate, the operating frequency of the return sludge pump and the residual sludge pump is controlled by the return magnetic mud flow rate and the residual magnetic mud flow rate, respectively, to complete the operation control of the magnetic coagulation water treatment process system. The calculation expressions for the return magnetic mud flow rate calculation model and the residual magnetic mud flow rate calculation model in S2 are as follows: ;in, Indicates the flow rate of the refluxed magnetic mud. This indicates the real-time inflow rate. This indicates the real-time suspended solids content in the flocculation reaction tank. This indicates the real-time suspended solids content in the effluent. This indicates the suspended solids content in the returned sludge. This indicates the mass ratio of magnetic powder to suspended solids in the flocculation reaction tank. This indicates the real-time suspended solids content in the influent. This indicates the real-time total phosphorus content of the influent. This indicates the real-time total phosphorus content in the effluent. Indicates the chemical oxygen demand removal rate. This indicates the chemical oxygen demand (COD) content in the influent. Indicates the maximum loss of magnetic powder. Indicates the remaining magnetic mud flow rate; S4 includes the following steps: S41. Obtain the real-time total phosphorus content of the influent and, in conjunction with the initial total phosphorus content of the influent, obtain the change value of the total phosphorus content of the influent. S42. Determine whether the change in total phosphorus content in the influent exceeds the gradient of total phosphorus content change in the influent. If yes, proceed to S43; otherwise, proceed to S44. S43. Based on the real-time total phosphorus content of the influent, control the addition of coagulant according to the coagulant dosing model; S44. Obtain the real-time influent flow rate and combine it with the initial influent flow rate to obtain the influent flow rate change value; S45. Determine whether the change in influent flow rate exceeds the gradient of influent flow rate change. If so, proceed to S46; otherwise, proceed to S47. S46. Based on the real-time influent flow rate and the reagent dosing model of magnetic powder, control the addition of magnetic powder; S47. Obtain the real-time suspended solids content in the influent and, in conjunction with the initial suspended solids content in the influent, obtain the change value of the suspended solids content in the influent. S48. Determine whether the change in the suspended solids content of the influent exceeds the gradient of the change in the suspended solids content of the influent. If yes, proceed to S49; otherwise, proceed to S5. S49. Based on the real-time suspended solids content of the influent and the flocculant dosing model, control the flocculant dosage. S5 includes the following steps: S51. Obtain the real-time suspended solids content in the flocculation reaction tank; S52. Based on the real-time suspended solids content in the flocculation reaction tank, the flow rate of the reflux magnetic mud is calculated using the reflux magnetic mud flow rate calculation model. S53. Based on the real-time suspended solids content in the flocculation reaction tank, the residual magnetic mud flow rate is calculated using the residual magnetic mud flow rate calculation model. S54. Based on the return magnetic mud flow rate and the residual magnetic mud flow rate, control the operating frequency of the return sludge pump and the residual sludge pump respectively to complete the operation control of the magnetic coagulation water treatment process system. The calculation expressions for the operating frequencies of the return sludge pump and the excess sludge pump are as follows: ； in, This indicates the operating frequency of the sludge return pump. Indicates the flow rate of the refluxed magnetic mud. This indicates the rated flow rate of the sludge return pump. This indicates the operating frequency of the waste sludge pump. Indicates the remaining magnetic mud flow rate. This indicates the rated flow rate of the residual sludge pump.

2. The operation control method for the magnetic coagulation water treatment process system according to claim 1, characterized in that, S1 includes the following steps: S11. Based on the flow meter installed at the inlet of the magnetic coagulation water treatment process system, obtain the real-time inlet flow of the magnetic coagulation water treatment process system. S12. Based on the suspended solids monitors installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time suspended solids content of the inlet and outlet of the magnetic coagulation water treatment process system is obtained respectively. S13. Based on the total phosphorus monitoring meters installed at the inlet and outlet of the magnetic coagulation water treatment process system, the real-time total phosphorus content of the influent and the total phosphorus content of the effluent of the magnetic coagulation water treatment process system are obtained respectively. S14. Based on the suspended solids monitor installed in the flocculation reaction tank of the magnetic coagulation water treatment process system, the real-time suspended solids content in the flocculation reaction tank is obtained. S15. The real-time influent flow rate, influent suspended solids content, effluent suspended solids content, influent total phosphorus content, effluent total phosphorus content, and suspended solids content in the flocculation reaction tank of the magnetic coagulation water treatment process system shall be used as the flow rate and pollutant monitoring data of the magnetic coagulation water treatment process system.

3. The operation control method for the magnetic coagulation water treatment process system according to claim 1, characterized in that, The calculation expression for the agent dosing model of the coagulant in S2 is as follows: ； in, This indicates the amount of coagulant added. Indicates the relative coefficient of the coagulant. This indicates the real-time inflow rate. Indicates the betting multiplier. This indicates the real-time total phosphorus content of the influent. This indicates the real-time total phosphorus content in the effluent. This indicates the content of the effective ingredients in the coagulant raw material. This indicates the concentration of the coagulant raw material. This indicates the amount of coagulant used in the coagulation reaction. This indicates the real-time content of suspended solids to be removed. This indicates the real-time suspended solids content in the influent. This indicates the real-time suspended solids content in the effluent. This represents the suspended solids coefficient.

4. The operation control method for the magnetic coagulation water treatment process system according to claim 1, characterized in that, The calculation expression for the magnetic powder dosing model in S2 is as follows: ； in, Indicates the amount of magnetic powder added. Indicates the amount of magnetic powder loss. This indicates the real-time inflow rate.

5. The operation control method for the magnetic coagulation water treatment process system according to claim 1, characterized in that, The calculation expression for the flocculant dosing model in S2 is as follows: ； in, This indicates the dosage of flocculant. This indicates the real-time inflow rate. This indicates the real-time content of suspended solids to be removed. This indicates the concentration of the flocculant stock solution. This indicates the real-time suspended solids content in the influent. This indicates the real-time suspended solids content in the effluent. Indicates the suspended solids coefficient. This indicates the real-time total phosphorus content of the influent. This indicates the real-time total phosphorus content in the effluent.

6. The operation control method for the magnetic coagulation water treatment process system according to claim 1, characterized in that, The range of the gradient values ​​for the total phosphorus content variation in the influent, the gradient values ​​for the influent flow rate variation, and the gradient values ​​for the suspended solids content variation in the influent, as set in S3, are 5% to 10%.

7. A system for controlling the operation of a magnetic coagulation water treatment process system according to any one of claims 1-6, characterized in that, include: The data acquisition module is used to acquire flow and pollutant monitoring data of the magnetic coagulation water treatment process system through flow meters, suspended solids monitors and total phosphorus monitors; The model building module is used to build agent dosing models for coagulants, magnetic powders and flocculants, as well as return magnetic mud flow calculation models and residual magnetic mud flow calculation models based on the flow and pollutant monitoring data of the magnetic coagulation water treatment process system. The gradient setting module is used to set the gradient for changes in total phosphorus content, suspended solids content, and flow rate of the influent. The chemical dosing control module is used to control the dosing of coagulants, magnetic powders, and flocculants based on the chemical dosing models of coagulants, magnetic powders, and flocculants, according to the gradients of changes in total phosphorus content, suspended solids content, and flow rate of the influent. The magnetic mud flow control module is used to control the operating frequency of the return sludge pump and the residual sludge pump based on the return magnetic mud flow calculation model and the residual magnetic mud flow calculation model, respectively. The storage monitoring module is used to monitor the dosage and residual amount of coagulant, magnetic powder and flocculant, and to issue a warning when the residual amount is lower than the preset residual threshold of coagulant, magnetic powder and flocculant. The data storage module is used to store the flow and pollutant monitoring data of the magnetic coagulation water treatment process system, the dosage of coagulant and flocculant, the amount of magnetic powder added, the flow rate of return magnetic mud, the flow rate of residual magnetic mud, and the operating frequency of return sludge pump and residual sludge pump to the local database and simultaneously store them to the cloud.

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