A method and system for chlorine addition control

Abstract

The application discloses a kind of chlorination control method and system, the method includes: obtaining parameter information, obtain the best chlorine dosage, best dosage, according to the best dosage in water pipeline chlorination;Curve quality control chart is constructed to obtain the first measurement data of residual chlorine in water after disinfection contact of filtered water, the evaluation of chlorination curve is carried out, and the best chlorine dosage and the best dosage are updated;Disinfection control quality chart is constructed, and the second measurement data of residual chlorine of effluent of clear water tank is obtained, quality evaluation is carried out to obtain control quality grade and show.Through the method provided by the application, according to the best dosage of chlorine and the adjustment of the dosage of chlorine can realize automatic chlorination control, which does not depend on professional technicians, can realize effective chlorination control, avoid the phenomenon of chlorination lag or excessive chlorination, through data analysis, long-term supervision and evaluation are carried out to disinfection control quality, potential problems and improvement space are identified, and the continuous improvement of water supply disinfection safety is ensured.

Description

Technical Field

[0001] This invention relates to the field of chlorination control technology, and in particular to a chlorination control method and system. Background Technology

[0002] Chlorination disinfection, which involves adding chlorine gas, liquid chlorine, or sodium hypochlorite to water to destroy and eliminate microorganisms, is an important step in tap water treatment. Its goal is to control the residual chlorine level in the treated water within a specified range. The key to controlling chlorination disinfection is ensuring appropriate chlorine concentration and contact time to effectively kill pathogens. Furthermore, excessive chlorination should be avoided to prevent adverse effects on human health and the environment.

[0003] There are two main traditional methods for controlling chlorination in water treatment plants. One is manual control by experienced staff. The other is automatic control using a PLC. In the latter method, the residual chlorine level and flow rate of the influent are used as feedforward inputs to the chlorination control PLC via a residual chlorine analyzer and flow meter. The PLC sets the dosage of chlorinated chemicals based on the feedforward inputs and then automatically adjusts the dosage based on the difference between the residual chlorine level in the effluent and the target control value.

[0004] However, manual control by experienced personnel requires a high level of expertise, and effective control is extremely difficult when water quality fluctuates. PLC automatic control, on the other hand, cannot adapt to water quality fluctuations because control parameters are often determined based on water volume and quality during the commissioning period. When significant fluctuations occur, on-site adjustments by technicians are necessary, requiring temporary switching to manual chlorination control. This also requires experienced technicians; otherwise, significant errors can occur during chlorination control, leading to delayed or excessive chlorination. Summary of the Invention

[0005] Therefore, the purpose of this invention is to at least partially address the shortcomings of the prior art, thereby proposing a chlorination control method and system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a chlorination control method, the method comprising:

[0008] Obtain parameter information, which includes at least the curve data of the chlorination curve, the residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank. The curve data of the chlorination curve includes at least the peak value of the chlorination amount-total chlorine curve, and the residual chlorine value of the effluent from the clear water tank includes the target value of the residual chlorine value of the effluent from the clear water tank.

[0009] The optimal chlorination amount and optimal dosage are obtained by using the peak value of the chlorination amount-total chlorine curve, the target value of residual chlorine in the effluent of the clear water tank, and the influent flow rate of the clear water tank. Chlorination is then added to the influent pipe of the clear water tank according to the optimal dosage, wherein the filtered water enters the clear water tank through the influent pipe.

[0010] A quality control curve is constructed, and multiple first measurement data of residual chlorine in the filtered water after chlorination disinfection are obtained. The chlorination curve is evaluated using the quality control curve and the multiple first measurement data to obtain an evaluation result. The chlorination curve is updated based on the evaluation result, and the optimal chlorination amount and the optimal dosage are adjusted based on the updated chlorination curve.

[0011] A disinfection control quality map is constructed, and multiple second measurement data of residual chlorine in the effluent of the clear water tank are obtained. Based on the multiple second measurement data and the disinfection control quality map, a quality evaluation is performed to obtain the control quality level and display it.

[0012] Furthermore, obtaining the optimal chlorination dosage and optimal dosage by using the peak value of the chlorination dosage-total chlorine curve, the target value of residual chlorine in the effluent of the clear water tank, and the influent flow rate of the clear water tank includes:

[0013] Taking the first and second derivatives of the chlorination dosage-total chlorine curve yields the peak value (X) of the curve. 1峰 Y 1峰 );

[0014] Compare the peak values ​​(X) of the chlorination dosage-total chlorine curve. 1峰 Y 1峰 The disinfection method is determined by the residual chlorine target value of the effluent from the clear water tank, and the optimal chlorine dosage is calculated based on the disinfection method.

[0015] The optimal dosage is obtained by combining the chlorination dosage-total chlorine curve and the influent flow rate of the clear water tank.

[0016] Furthermore, the parameter information also includes a first free chlorine target value FC. 1目标 and the first total chlorine target value TC 1目标 The target value for residual chlorine in the effluent from the clear water tank includes a second target value for free chlorine, FC. 2目标 Second total chlorine target value TC 2目标 The chlorination curve data also includes the chlorination amount-total chlorine curve formula y1=f(x1) and the chlorination amount-free chlorine curve formula y2=f(x2). The comparison of the peak value (X) of the chlorination amount-total chlorine curve... 1峰 Y 1峰 The disinfection method is derived from the residual chlorine target value of the effluent from the clear water tank, and the optimal chlorination dosage is obtained based on the disinfection method, including:

[0017] If Y 1峰 >TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the chlorination amount-total chlorine curve formula y1=f(x1), where:

[0018] If the number of obtained x1 values ​​is greater than 1, then the smallest x1 value is taken as the optimal chlorination amount;

[0019] If the number of x1 values ​​obtained is 1, then the obtained x1 value is the optimal chlorination amount;

[0020] If Y 1峰 =TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the chlorination amount-total chlorine curve formula y1=f(x1), we obtain the value of x1, and take the smaller value of x1 as the optimal chlorination amount;

[0021] If Y 1峰 <TC 2目标 The disinfection method is free chlorine disinfection, which involves FC. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount;

[0022] If the peak value of the chlorine dosage-total chlorine curve is not present, then the disinfection method is free chlorine disinfection, and FC is used. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount.

[0023] Furthermore, the first measurement data includes a first free chlorine measurement value and a first total chlorine measurement value, and the parameter information also includes a first free chlorine upper limit value FC. 1上限 The first lower limit of free chlorine FC 1下限 First total chlorine limit TC 1上限 and the first total chlorine lower limit TC 1下限 The process includes constructing a curve quality control chart, acquiring multiple first measurement data after disinfection of the clear water tank, evaluating the chlorination curve using the curve quality control chart and the multiple first measurement data to obtain an evaluation result, and updating the chlorination curve based on the evaluation result.

[0024] The curve quality control chart is constructed according to the disinfection method. The horizontal axis of the curve quality control chart is the time axis, the vertical axis is the residual chlorine axis, and it includes multiple control lines parallel to the time axis, namely the first target limit, the first upper warning limit, the upper control limit, the first lower warning limit, and the lower control limit.

[0025] When the disinfection method is free chlorine disinfection, the residual chlorine value of the first target limit = FC 1目标 The residual chlorine value of the first upper warning limit = FC 1目标 +(FC 1上限 -FC 1目标 )·n / m, where m is 2 and n is 1; the residual chlorine value at the upper control limit = FC 1上限 The residual chlorine value of the first lower warning limit = FC 1目标 +(FC 1下限 -FC 1目标 )·q / p, where p is 2 and q is 1; the residual chlorine value of the lower control limit = FC 1下限 ,in:

[0026] If any of the first free chlorine measurements exceeds the upper control limit or falls below the lower control limit, the chlorination curve is updated.

[0027] If all the first free chlorine measurement values ​​fall within the first upper warning limit and the first lower warning limit, but i consecutive first free chlorine measurement values ​​increase monotonically or decrease monotonically, and the difference between two adjacent measurement values ​​exceeds a preset difference, then the chlorination curve is updated, where i is a positive integer greater than or equal to 4.

[0028] If the first free chlorine measurement value falls between the first upper warning limit and the upper control limit, or between the first lower warning limit and the lower control limit, and at least one of the first two measured values ​​of the first free chlorine also falls between the corresponding first upper warning limit and the upper control limit, and between the first lower warning limit and the lower control limit, then the chlorination curve is updated.

[0029] When the disinfection method is total chlorine disinfection, the residual chlorine value at the first target limit = TC 1目标 The residual chlorine value at the first upper warning limit = TC 1目标 +(TC 1上限 -TC 1目标 )·n′ / m′, where m′ is 2 and n′ is 1; the residual chlorine value at the upper control limit = TC 1上限 The residual chlorine value of the first lower warning limit = TC 1目标 +(TC 1下限 -TC 1目标 )·q′ / p′, where p′ is 2 and q′ is 1; the residual chlorine value of the lower control limit = TC 1下限 ,in:

[0030] If any of the first total chlorine measurements exceeds the upper control limit or falls below the lower control limit, the chlorination curve is updated.

[0031] If all the first total chlorine measurements fall within the first upper warning limit and the first lower warning limit, but j consecutive first total chlorine measurements monotonically increase or monotonically decrease, and the difference between two adjacent measurements exceeds a preset difference, then the chlorination curve is updated, where j is a positive integer greater than or equal to 4.

[0032] If the first total chlorine measurement falls between the first upper warning limit and the upper control limit, or between the first lower warning limit and the lower control limit, and at least one of the first two measurements of the first total chlorine also falls between the corresponding first upper warning limit and the upper control limit, and the first lower warning limit and the lower control limit, then the chlorination curve is updated; and

[0033] When the evaluation results show that the chlorination curve is of normal quality, the chlorination curve is continuously evaluated.

[0034] Furthermore, the second measurement data includes a second free chlorine measurement value and a second total chlorine measurement value, and the residual chlorine value in the effluent also includes a second upper limit value for free chlorine, FC. 2上限 Second free chlorine lower limit FC 2下限 Second total chlorine limit TC 2上限 Second total chlorine lower limit TC 2下限 The process of constructing a disinfection control quality map, acquiring multiple second measurement data points of residual chlorine in the effluent from the clear water tank, and performing a quality evaluation based on the multiple second measurement data points and the disinfection control quality map to obtain and display the control quality level includes:

[0035] The disinfection control quality chart is constructed based on the disinfection method. The horizontal axis of the disinfection control quality chart is the time axis, the vertical axis is the residual chlorine axis, and it also includes multiple control lines parallel to the time axis, namely the second target limit, the second upper warning limit, and the second lower warning limit.

[0036] When the disinfection method is free chlorine disinfection, the residual chlorine value of the second target limit = FC 2目标 The residual chlorine value of the second upper warning limit = FC 2目标 +(FC 2上限 -FC 2目标 )·j / h, where h is 2 and j is 1; the residual chlorine value of the second lower warning limit = FC 2目标 +(FC 2下限 -FC 2目标 )·s / r, where r is 2 and s is 1, and:

[0037] If all the second free chlorine measurements are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A;

[0038] If all the second free chlorine measurements are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B.

[0039] If the second free chlorine measurement value is outside the second upper warning limit and the second lower warning limit, the control quality level is Class C;

[0040] When the disinfection method is total chlorine disinfection, the residual chlorine value of the second target limit = TC 2目标 The residual chlorine value of the second upper warning limit = TC 2目标 +(TC 2上限 -TC 2目标 )·j′ / h′, h′ is 2, j′ is 1; the residual chlorine value of the second lower warning limit = TC 2目标 +(TC 2下限 -TC 2目标 )·s′ / r′, where r′ is 2 and s′ is 1, and:

[0041] If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A;

[0042] If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B.

[0043] If the second total chlorine measurement value falls outside the second upper warning limit and the second lower warning limit, the control quality level is Grade C.

[0044] Furthermore, the coefficient of variation is calculated as follows:

[0045]

[0046] Where n is the amount of data; T i The i-th measurement value of the second free chlorine measurement value or the second total chlorine measurement value; This is the average of all the second free chlorine measurements and the second total chlorine measurements.

[0047] Furthermore, the step of adding chlorine to the inlet pipe of the clear water tank according to the optimal dosage further includes:

[0048] Periodically monitor the ammonia concentration in the raw water;

[0049] If the change in the ammonia concentration of the raw water exceeds ±0.1 mg / L, the chlorination curve should be updated immediately, and the acquisition cycle of the chlorination curve should be adjusted.

[0050] If the change in the ammonia concentration of the raw water is within ±0.05 mg / L, the acquisition cycle of the chlorination curve will be adjusted to the user setting.

[0051] Furthermore, this application also provides a chlorination control system, including a control module, a parameter setting module, a flow monitoring module, a chlorination curve acquisition module, a residual chlorine online monitoring module, a curve quality dynamic evaluation module, a disinfection control quality evaluation module, a chlorine dosing module, and an information display module. The control module is communicatively connected to the parameter setting module, flow monitoring module, chlorination curve acquisition module, residual chlorine online monitoring module, curve quality dynamic evaluation module, disinfection control quality evaluation module, chlorine dosing module, and information display module.

[0052] Furthermore, the chlorination curve acquisition module includes a sampling unit, a disinfectant addition unit, a first mixing unit, a second mixing unit, a reagent addition unit, a detection unit, a correction unit, and a curve fitting unit. The sampling unit, the disinfectant addition unit, and the second mixing unit are respectively connected to the first mixing unit. The second mixing unit is also connected to the detection unit. The correction unit is communicatively connected to the detection unit and the curve fitting unit. The curve fitting unit is also connected to the control module.

[0053] Furthermore, it also includes an online ammonia monitoring module, a storage module, and a communication module, and the control module is communicatively connected to the online ammonia monitoring module, the storage module, and the communication module.

[0054] This invention provides a chlorination control method and system. The method includes: acquiring parameter information, the parameter information including at least curve data of a chlorination curve, the residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank; the curve data of the chlorination curve including at least the peak value of the chlorination amount-total chlorine curve, and the residual chlorine value of the effluent from the clear water tank including the target residual chlorine value; obtaining the optimal chlorination amount and the optimal dosage through the peak value of the chlorination amount-total chlorine curve, the target residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank; and adding chlorine to the influent pipe of the clear water tank according to the optimal dosage, wherein filtered water enters the clear water tank through the influent pipe. The invention describes a clear water tank; it constructs a curve quality control chart and acquires multiple first measurement data points of residual chlorine in the filtered water after chlorination disinfection. The chlorination curve is evaluated using the curve quality control chart and the multiple first measurement data points to obtain an evaluation result. Based on the evaluation result, the chlorination curve is updated, and the optimal chlorination dosage and optimal injection rate are adjusted according to the updated chlorination curve. A disinfection control quality chart is constructed, and multiple second measurement data points of residual chlorine in the effluent from the clear water tank are acquired. The quality is evaluated based on the multiple second measurement data points and the disinfection control quality chart to obtain and display the control quality level. The chlorination control method provided by this invention calculates the optimal injection rate using the acquired parameters, adds chlorine according to the optimal injection rate, and updates and adjusts the chlorine injection rate to achieve automatic chlorination control without relying on professional technicians. It also achieves effective chlorination control, avoiding chlorination lag or over-chlorination. Furthermore, through data analysis, it allows for long-term monitoring and evaluation of disinfection control quality, identifying potential problems and areas for improvement, ensuring continuous improvement in water supply disinfection safety. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0056] Figure 1 This is a schematic flowchart of the chlorination control method of the present invention;

[0057] Figure 2 This is a schematic diagram of a sub-process of the chlorination control method of the present invention;

[0058] Figure 3 This is a schematic diagram of the control line in the mass graph of the chlorination control method of the present invention;

[0059] Figure 4 This is a schematic diagram of the chlorination control system of the present invention;

[0060] Figure 5 This is a schematic diagram of the chlorination amount-total chlorine curve of the chlorination control method of the present invention;

[0061] Figure 6 This is a schematic diagram of the chlorination amount-free chlorine curve of the chlorination control method of the present invention.

[0062] The reference numerals in the diagram represent: 1. Control module; 2. Parameter setting module; 3. Flow monitoring module; 4. Chlorination curve acquisition module; 41. Sampling unit; 42. Disinfectant addition unit; 43. First mixing unit; 44. Reagent addition unit; 45. Second mixing unit; 46. Detection unit; 47. Correction unit; 48. Curve fitting unit; 5. Residual chlorine online monitoring module; 6. Curve quality dynamic evaluation module; 7. Disinfection control quality evaluation module; 8. Chlorine dosing module; 9. Information display module; 10. Ammonia online monitoring module; 11. Storage module; 12. Communication module. Detailed Implementation

[0063] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0064] Please see Figure 1 , Figure 1 This is a flowchart illustrating the chlorination control method in an embodiment of this application. The embodiment of this application provides a chlorination control method, the method comprising:

[0065] Step 101: Obtain parameter information. The parameter information includes at least the curve data of the chlorination curve, the residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank. The curve data of the chlorination curve includes at least the peak value of the chlorination amount-total chlorine curve, and the residual chlorine value of the effluent from the clear water tank includes the target value of the residual chlorine value of the effluent from the clear water tank.

[0066] In this embodiment, the parameter information includes the chlorination curve data, the residual chlorine control requirements for the effluent from the clear water tank, and the influent flow rate of the clear water tank. Specifically, the chlorination curve data includes the peak value of the total chlorine curve, and the residual chlorine value of the effluent from the clear water tank includes the target residual chlorine value. Furthermore, the chlorination curve data also includes the number of concentration points for each chlorination gradient, the concentration of each gradient, and the automatic acquisition cycle of the chlorination curve. The acquisition cycle ranges from 15 minutes to 24 hours, and can be set according to the user's needs.

[0067] The parameter information also includes the residual chlorine control requirements for the filtered water after a period of chlorination contact. The residual chlorine data in the water is measured again after a period of chlorination contact, with the contact time lasting at least 5-15 minutes. There are two chlorination disinfection methods: one is free chlorine disinfection, and the data obtained includes the first free chlorine target value FC. 1目标 The first upper limit of free chlorine FC 1上限 The first lower limit of free chlorine FC 1下限 Another method is total chlorine disinfection, and the data obtained includes the first total chlorine target value TC. 1目标 The first upper limit of total chlorine TC 1上限 and the first total chlorine lower limit TC 1下限 The residual chlorine value of the effluent from the clear water tank includes not only the second free chlorine target value FC 2目标 Second total chlorine target value TC 2目标 It also includes the second upper limit for free chlorine, FC. 2上限 Second free chlorine lower limit FC 2下限 Second total chlorine limit TC 2上限 Second total chlorine lower limit TC 2下限 The chlorination curve data also includes the chlorination amount-total chlorine curve and its formula y1=f(x1), and the chlorination amount-free chlorine curve and its formula y2=f(x2).

[0068] Step 102: Obtain the optimal chlorination amount and optimal dosage by using the peak value of the chlorination amount-total chlorine curve, the target value of residual chlorine in the effluent of the clear water tank, and the influent flow rate of the clear water tank. Add chlorine to the influent pipe of the clear water tank according to the optimal dosage, wherein the filtered water enters the clear water tank through the influent pipe.

[0069] In this embodiment, the optimal chlorination dosage and optimal injection rate are calculated using the parameter information obtained in step 101. Specifically, the optimal chlorination dosage is first determined by the peak value of the chlorination dosage-total chlorine curve and the target residual chlorine value in the clear water tank. Then, the optimal injection rate is calculated by combining the obtained optimal chlorination dosage with the influent flow rate of the clear water tank. Chlorination is then performed in the influent pipe of the clear water tank according to the optimal injection rate, thereby achieving automatic chlorination control without relying on professional technicians. The influent pipe is located between the filter and the clear water tank, allowing the filtered water from the filter to flow into the clear water tank. Chlorination in the influent pipe ensures that the filtered water undergoes chlorination disinfection and contact before flowing into the clear water tank.

[0070] Step 103: Construct a curve quality control chart and obtain multiple first measurement data of residual chlorine in the filtered water after chlorination disinfection. Evaluate the chlorination curve using the curve quality control chart and the multiple first measurement data to obtain an evaluation result. Update the chlorination curve based on the evaluation result and adjust the optimal chlorination amount and the optimal dosage based on the updated chlorination curve.

[0071] In this embodiment, a quality control chart of the chlorination curve is first constructed. Then, multiple first measurement data of residual chlorine in the filtered water after a period of chlorination disinfection contact in the inlet pipe are obtained. The disinfection contact time is preferably 5-15 minutes. Residual chlorine data in the water is then measured to obtain the first measurement data. By comparing multiple first measurement data with the quality control chart, the quality of the chlorination curve can be evaluated, thus obtaining the evaluation result of the chlorination curve. The chlorination curve is then updated based on the obtained evaluation result. The optimal dosage and optimal chlorination amount are adjusted according to the updated chlorination curve to achieve effective chlorination control and avoid chlorination lag or over-chlorination.

[0072] Step 104: Construct a disinfection control quality chart, obtain multiple second measurement data of residual chlorine in the effluent of the clear water tank, and conduct a quality evaluation based on the multiple second measurement data and the disinfection control quality chart to obtain and display the control quality level.

[0073] In this embodiment, a disinfection control quality map of the chlorination curve is constructed, and multiple second measurement data of residual chlorine in the effluent from the clear water tank are obtained, namely, the second measurement data of residual chlorine in the water flowing out of the clear water tank's effluent pipe. By comparing multiple second measurement data with the disinfection control quality map, the control quality level of the chlorination curve can be evaluated. After obtaining the control quality level of the chlorination curve, it is displayed, thereby enabling long-term monitoring and evaluation of disinfection control quality, identifying potential problems and areas for improvement, and ensuring the continuous improvement of water supply disinfection safety.

[0074] Further, please refer to Figure 2 , Figure 2 This is a schematic diagram of a sub-process of the chlorination control method in this application embodiment. In this embodiment, obtaining the optimal chlorination amount and optimal dosage by using the peak value of the chlorination amount-total chlorine curve, the target value of residual chlorine in the effluent of the clear water tank, and the influent flow rate of the clear water tank includes:

[0075] Step 201: Perform first and second derivatives on the chlorination dosage-total chlorine curve to obtain the peak value (X) of the chlorination dosage-total chlorine curve. 1峰 Y 1峰 );

[0076] Step 202: Compare the peak value (X) of the chlorination dosage-total chlorine curve. 1峰 Y 1峰 The disinfection method is determined by the residual chlorine target value of the effluent from the clear water tank, and the optimal chlorine dosage is calculated based on the disinfection method.

[0077] Step 203: Combine the chlorination amount-total chlorine curve and the influent flow rate of the clear water tank to obtain the optimal dosage.

[0078] In this embodiment, the first and second derivatives of the chlorination amount-total chlorine curve are first calculated to find the point where the first derivative is 0 and the second derivative is <0, which is the peak value (X1 peak, Y1 peak) of the chlorination amount-total chlorine curve.

[0079] By comparing the peak values ​​(X1 peak, Y1 peak) of the chlorination dosage-total chlorine curve with the target residual chlorine value in the clear water tank effluent, the specific disinfection method can be obtained. Based on the disinfection method, the optimal chlorination dosage can then be calculated. Specifically, the following is the method for determining the optimal chlorination dosage:

[0080] (1) If Y 1峰 >TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the formula y1=f(x1) for the chlorination amount-total chlorine curve, where:

[0081] If the number of obtained x1 values ​​is greater than 1, then the smallest x1 value is taken as the optimal chlorination amount;

[0082] If the number of x1 values ​​obtained is 1, then the obtained x1 value is the optimal chlorination amount;

[0083] (2) If Y 1峰 =TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the chlorination amount-total chlorine curve formula y1=f(x1), we obtain the value of x1, and take the smaller value of x1 as the optimal chlorination amount;

[0084] (3) If Y 1峰 <TC 2目标 The disinfection method is free chlorine disinfection, which involves FC. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount;

[0085] (4) If the peak value of the chlorine dosage-total chlorine curve does not exist, then the disinfection method is free chlorine disinfection, and FC is added. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount.

[0086] After obtaining the optimal chlorination dosage, the optimal addition rate is calculated based on the inflow rate of the clear water tank. Specifically, the optimal addition rate = (optimal chlorination dosage × water flow rate) ÷ (effective chlorine concentration of sodium hypochlorite solution × density of sodium hypochlorite solution × 1000). Wherein, the unit of optimal addition rate is L / h; the unit of optimal chlorination dosage is mg / L; and the unit of water flow rate is m³ / h. 3 / h; effective chlorine concentration of sodium hypochlorite solution: mass fraction; density of sodium hypochlorite solution: g / mL; 1000 is the unit conversion factor.

[0087] Further, the first measurement data is the residual chlorine in the filtered water after 5-15 minutes of chlorination disinfection in the inlet pipe. That is, after the filtered water enters the chlorinated inlet pipe for 5-15 minutes of disinfection, the first measurement data is measured. The first measurement data includes the first free chlorine measurement value and the first total chlorine measurement value. The process involves constructing a curve quality control chart and obtaining multiple first measurement data points of residual chlorine in the filtered water after chlorination disinfection. The chlorination curve is evaluated using the curve quality control chart and the multiple first measurement data points to obtain an evaluation result. The chlorination curve is then updated based on the evaluation result, including:

[0088] A quality control curve for chlorination is constructed based on the disinfection method. The horizontal axis of the quality control curve is the time axis, and the vertical axis is the residual chlorine axis. It includes multiple control lines parallel to the time axis, namely the first target limit, the first upper warning limit, the upper control limit, the first lower warning limit, and the lower control limit. Each control line represents a specific residual chlorine value. Please refer to [link / reference needed]. Figure 3 , Figure 3 This is a schematic diagram of the control lines;

[0089] 1. When the disinfection method is free chlorine disinfection, the residual chlorine value of the first target limit = FC 1目标 The residual chlorine value of the first upper warning limit = FC 1目标 +(FC 1上限 -FC1目标 )·n / m, where m is preferably 2 and n is preferably 1, but other integers can be selected based on the specific data of the target value and the upper limit value. No specific numerical limit is specified here; the residual chlorine value of the upper control limit = FC 1上限 The residual chlorine value of the first lower warning limit = FC 1目标 +(FC 1下限 -FC 1目标 )·q / p, where p is preferably 2 and q is preferably 1. Other integers can also be selected based on the specific data of the target value and the upper limit value. The specific values ​​are not limited here. The residual chlorine value of the lower control limit = FC 1下限 ,in:

[0090] (1) If there is one first free chlorine measurement value that exceeds the upper control limit or is lower than the lower control limit, then the chlorination curve is updated, that is, the chlorination curve is acquired again, and the chlorination curve updating device is updated. The optimal chlorination amount is adjusted according to the chlorination adjustment scheme. Before obtaining the latest optimal dosage, the chlorination is performed according to the previous optimal dosage. The specific chlorination adjustment scheme is as follows:

[0091] a. If the first free chlorine measurement value exceeds the upper control limit, and the first free chlorine measurement value - upper control limit = b mg / L, and the first free chlorine measurement value - first target limit = c mg / L, then the adjustment factor is (b+c) / 2, that is, the optimal chlorine dosage = the original optimal chlorine dosage - (b+c) / 2;

[0092] b. If the first free chlorine measurement value is lower than the lower control limit, and the first free chlorine measurement value - lower control limit = d mg / L, and the first free chlorine measurement value - first target limit = e mg / L, then the adjustment factor is (d+e) / 2, that is, the optimal chlorine dosage = the original optimal chlorine dosage - (d+e) / 2.

[0093] (2) If all the first free chlorine measurement values ​​fall within the first upper warning limit and the first lower warning limit, but i consecutive first free chlorine measurement values ​​increase monotonically or decrease monotonically, and the difference between two adjacent measurement values ​​exceeds the preset difference, then the chlorination curve is updated, where i is a positive integer greater than or equal to 4, and the preset difference is specifically 0.02 mg / L in this embodiment.

[0094] (3) If the first free chlorine measurement value falls between the first upper warning limit and the upper control limit, or falls between the first lower warning limit and the lower control limit, and at least one of the first two measured values ​​of the first free chlorine also falls between the corresponding first upper warning limit and the upper control limit and the first lower warning limit and the lower control limit, then update the chlorination curve;

[0095] 2. When the disinfection method is total chlorine disinfection, the residual chlorine value at the first target limit = TC1目标 The residual chlorine value at the first upper warning limit = TC 1目标 +(TC 1上限 -TC 1目标 )·n′ / m′, where m′ is preferably 2 and n′ is preferably 1, but other integers can be selected based on the specific data of the target value and the upper limit value. No specific numerical limit is specified here; the residual chlorine value of the upper control limit = TC 1上限 The residual chlorine value of the first lower warning limit = TC 1目标 +(TC 1下限 -TC 1目标 )·q′ / p′, where p′ is preferably 2 and q′ is preferably 1, but other integers can be selected based on the specific data of the target value and the upper limit value. No specific numerical limit is specified here; the residual chlorine value of the lower control limit = TC 1下限 ,in:

[0096] (1) If there is one first total chlorine measurement value that exceeds the upper control limit or is lower than the lower control limit, then the chlorination curve is updated, and the optimal chlorination amount is adjusted in the chlorination curve updating device according to the chlorination adjustment scheme, wherein the chlorination adjustment scheme is as follows:

[0097] a. If the first total chlorine measurement value exceeds the upper control limit, and the first total chlorine measurement value - upper control limit = b mg / L, and the first total chlorine measurement value - first target limit = c mg / L, then the adjustment factor is (b+c) / 2, that is, the optimal chlorine dosage = the original optimal chlorine dosage - (b+c) / 2;

[0098] b. If the first total chlorine measurement value is lower than the lower control limit, and the first total chlorine measurement value - lower control limit = d mg / L, and the first total chlorine measurement value - first target limit = e mg / L, then the adjustment factor is (d+e) / 2, that is, the optimal chlorine dosage = the original optimal chlorine dosage - (d+e) / 2.

[0099] (2) If all the first total chlorine measurement values ​​fall within the first upper warning limit and the first lower warning limit, but j consecutive first total chlorine measurement values ​​increase monotonically or decrease monotonically, and the difference between two adjacent measurement values ​​exceeds the preset difference, then update the chlorination curve, where j is a positive integer greater than or equal to 4.

[0100] (3) If the first total chlorine measurement value falls between the first upper warning limit and the upper control limit, or between the first lower warning limit and the lower control limit, and at least one of the first two measured values ​​of the first total chlorine also falls between the corresponding first upper warning limit and the upper control limit, and the first lower warning limit and the lower control limit, then the chlorination curve is updated; and

[0101] 3. If none of the above two disinfection methods occur, the evaluation results will show that the quality of the chlorination curve is normal, and the chlorination curve will continue to be evaluated.

[0102] Specifically, if the evaluation result indicates that the chlorination curve needs to be updated, then the chlorination curve is obtained again; if the evaluation result indicates that the optimal chlorination amount needs to be adjusted within the updated curve range, then the optimal chlorination amount is adjusted according to the chlorination adjustment method.

[0103] Further, the second measurement data is the residual chlorine in the effluent pipe of the clear water tank. The second measurement data includes a second free chlorine measurement value and a second total chlorine measurement value. The process involves constructing a disinfection control quality map, acquiring multiple second measurement data points for residual chlorine in the effluent of the clear water tank, and performing a quality evaluation based on these multiple second measurement data points and the disinfection control quality map to obtain and display the control quality level, including:

[0104] The disinfection control quality chart is constructed based on the disinfection method. The horizontal axis of the disinfection control quality chart is the time axis, the vertical axis is the residual chlorine axis, and it also includes multiple control lines parallel to the time axis, namely the second target limit, the second upper warning limit, and the second lower warning limit. Each control line represents a specific residual chlorine value.

[0105] 1. When the disinfection method is free chlorine disinfection, the residual chlorine value of the second target limit = FC 2目标 The residual chlorine value of the second upper warning limit = FC 2目标 +(FC 2上限 -FC 2目标 )·j / h, where h is preferably 2 and j is preferably 1, but other integers can be selected based on the specific data of the target value and the upper limit value. No specific numerical limit is specified here; the residual chlorine value of the second lower warning limit = FC 2目标 +(FC 2下限 -FC 2目标 )·s / r, where r is preferably 2 and s is preferably 1. Other integers can also be selected based on the specific data of the target value and the upper limit value. The specific values ​​are not limited here.

[0106] (1) If all the second free chlorine measurement values ​​are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A;

[0107] (2) If all the second free chlorine measurement values ​​are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B;

[0108] (3) If the second free chlorine measurement value is outside the second upper warning limit and the second lower warning limit, the control quality level is Class C;

[0109] 2. When the disinfection method is total chlorine disinfection, the residual chlorine value of the second target limit = TC 2目标 The residual chlorine value of the second upper warning limit = TC 2目标 +(TC 2上限 -TC 2目标 )·j′ / h′, where h′ is preferably 2 and j′ is preferably 1, but other integers can be selected based on the specific data of the target value and the upper limit value. No specific numerical limit is specified here; the residual chlorine value of the second lower warning limit = TC 2目标 +(TC 2下限 -TC 2目标 )·s′ / r′, where r′ is preferably 2 and s′ is preferably 1. Other integers can also be selected based on the specific data of the target value and the upper limit value. The specific values ​​are not limited here.

[0110] (1) If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A;

[0111] (2) If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B;

[0112] (3) If the second total chlorine measurement value falls outside the second upper warning limit and the second lower warning limit, the control quality level is Class C.

[0113] The time span for the data required for the quality evaluation of disinfection control is at least 7 days.

[0114] Furthermore, the coefficient of variation is calculated as follows:

[0115]

[0116] Where n is the total amount of data obtained for the second free chlorine measurement and the second total chlorine measurement; T i The i-th measurement value of the second free chlorine measurement value or the second total chlorine measurement value; This is the average of all the second free chlorine measurements and the second total chlorine measurements.

[0117] Furthermore, the step of adding chlorine to the inlet pipe of the clear water tank according to the optimal dosage further includes:

[0118] Periodically monitor the ammonia concentration in the raw water;

[0119] If the change in the ammonia concentration of the raw water exceeds ±0.1 mg / L, the chlorination curve should be updated immediately, and the acquisition cycle of the chlorination curve should be adjusted.

[0120] If the change in the ammonia concentration of the raw water is within ±0.05 mg / L, the acquisition cycle of the chlorination curve will be adjusted to the user setting.

[0121] In this embodiment, the raw water ammonia concentration is obtained as follows: because the raw water ammonia concentration will change continuously, for example, the first measurement of the raw water ammonia concentration is 0.1, and the second measurement may be due to rain or other reasons, and the raw water ammonia concentration will become 0.2. Therefore, the raw water ammonia concentration will be periodically and continuously detected, and the monitoring period is ≤1h.

[0122] If the change in the original ammonia concentration between two measurements exceeds ±0.1 mg / L, the chlorination curve will be updated immediately, and the acquisition period for the chlorination curve will be adjusted from the user-set acquisition period to 30 minutes. If the change in the original ammonia concentration between two measurements is within ±0.05 mg / L, the acquisition period for the chlorination curve will be adjusted back to the user-set acquisition period. The user will initially set the acquisition period for the chlorination curve.

[0123] Further, please refer to Figure 4 , Figure 4 This is a schematic diagram of the chlorination control system modules in this embodiment. In this embodiment, the chlorination control system includes a control module 1, a parameter setting module 2, a flow monitoring module 3, a chlorination curve acquisition module 4, a residual chlorine online monitoring module 5, a curve quality dynamic evaluation module 6, a disinfection control quality evaluation module 7, a chlorine dosing module 8, and an information display module 9. The control module 1 is communicatively connected to the parameter setting module 2, the flow monitoring module, the chlorination curve acquisition module 4, the residual chlorine online monitoring module 5, the curve quality dynamic evaluation module 6, the disinfection control quality evaluation module 7, the chlorine dosing module 8, and the information display module 9.

[0124] In this embodiment, the parameter setting module 2 is used to acquire and set parameter information;

[0125] The flow monitoring module 3 is used to drive the flow meter to monitor the inflow rate of the clear water tank and transmit it to the control module 1;

[0126] The chlorination curve acquisition module 4 receives periodic or temporary instructions from the control module 1 and initiates a series of actions to acquire the chlorination curve. After the series of actions are completed, the chlorination curve acquisition module 4 returns the acquired chlorination curve information to the control module 1.

[0127] The chlorine dosing module 8 drives the chlorine metering pump to perform chlorination into the inlet pipe of the clear water tank according to the current optimal dosage.

[0128] The residual chlorine online monitoring module 5 completes the task of residual chlorine monitoring and data transmission. The monitoring cycle is less than or equal to 5 minutes. It monitors the residual chlorine in the filtered water after 5-15 minutes of disinfection contact, obtains the first free chlorine measurement value and the first total chlorine measurement value, and transmits the measurement values ​​to the curve quality dynamic evaluation module 6. The residual chlorine online monitoring module 5 also monitors the residual chlorine in the effluent of the clear water tank, obtains the second free chlorine measurement value and the second total chlorine measurement value, and transmits the measurement values ​​to the disinfection control quality evaluation module 7.

[0129] The curve quality dynamic evaluation module 6 receives instructions from the control module 1 to start the curve quality evaluation. It receives the first free chlorine measurement value and the first total chlorine measurement value output by the residual chlorine online monitoring module 5 and uses them to continuously evaluate the curve quality. If new and different evaluation results occur during the evaluation process, the chlorination curve is updated. If the chlorination dosage needs to be adjusted during the chlorination curve update, the optimal chlorination dosage is adjusted according to the chlorination adjustment plan. At the same time, the real-time evaluation results are returned to the control module 1.

[0130] The disinfection control quality evaluation module 7 receives the quality from the control module 1, initiates the control quality level evaluation, receives the second free chlorine measurement value and the second total chlorine measurement value output by the residual chlorine online monitoring module 5, statistically analyzes the trend of the second residual chlorine measurement value, and uses it to evaluate the control quality level. Specifically, according to the evaluation data volume requirements, the second residual chlorine measurement value in the most recent time period is displayed on the disinfection control quality graph, the evaluation is carried out according to the disinfection control quality evaluation rules, and the level evaluation result of the chlorination curve is returned to the control module 1.

[0131] Information display module 9 displays the following information: parameter settings, chlorination curve information, optimal dosage, curve quality assessment results, and disinfection control evaluation level.

[0132] The control module 1 can send a dosing command to the chlorine dosing module 8 according to the optimal dosing amount. When the dynamic evaluation module 6 of the receiving curve quality needs to update the evaluation result of the chlorination curve, it can also send a command to the chlorination curve acquisition module 4 to start acquiring the chlorination curve.

[0133] In this embodiment, the working process of the chlorination system is as follows:

[0134] Control module 1 sends working instructions to chlorination curve acquisition module 4, curve quality dynamic evaluation module 6, disinfection control quality evaluation module 7, and chlorine dosing module 8. The instructions sent to chlorination curve acquisition module 4 include periodic instructions and temporary instructions, with a period range of 15min to 24h. The acquisition period is set according to user needs.

[0135] Receive parameter information output by parameter setting module 2, receive water inlet flow data of clear water tank output by flow monitoring module 3, receive chlorination curve information output by chlorination curve acquisition module 4, receive evaluation results output by curve quality dynamic evaluation module 6, and receive evaluation results output by disinfection control quality evaluation module 7.

[0136] Calculate the optimal dosage and send a dosing command to the chlorine dosing module 8;

[0137] The system sends parameter information, clear water tank influent flow rate data, optimal dosage data, residual chlorine measurement data, curve quality assessment results, and disinfection control evaluation results to the information display module 9, which then displays them in an orderly manner, creating interaction with the user.

[0138] Furthermore, the chlorination curve acquisition module 4 includes a sampling unit 41, a disinfectant addition unit 42, a first mixing unit 43, a second mixing unit 45, a reagent addition unit 44, a detection unit 46, a correction unit 47, and a curve fitting unit 48. The sampling unit 41, the disinfectant addition unit 42, and the second mixing unit 45 are respectively connected to the first mixing unit 43. The second mixing unit 45 is also connected to the detection unit 46. The correction unit 47 is communicatively connected to the detection unit 46 and the curve fitting unit 48. The curve fitting unit 48 is also connected to the control module 1.

[0139] In this embodiment, the specific steps for obtaining the chlorination curve are as follows:

[0140] 1. Sampling unit 41 operates a peristaltic pump to take an appropriate amount of filtered water sample, which enters the first mixing unit 43 through the water sample pipeline;

[0141] 2. Disinfectant addition unit 42 operates a peristaltic pump to take an appropriate amount of sodium hypochlorite solution and enter the first mixing unit 43 through the disinfectant pipeline;

[0142] 3. The two are mixed and reacted in the first mixing unit 43. The disinfected water sample comes out from the first mixing unit 43 and enters the second mixing unit 45 through the disinfected water sample pipeline.

[0143] 4. The reagent adding unit 44 operates a peristaltic pump to take an appropriate amount of residual chlorine reagent, which enters the second mixing unit 45 through the reagent pipeline. The residual chlorine reagent includes:

[0144] Reagents for detecting free chlorine: buffers, DPD;

[0145] Reagents for detecting total chlorine: buffer, potassium iodide, DPD;

[0146] The amount of residual chlorine reagent added is sufficient to completely react with the maximum concentration of chlorine added.

[0147] 5. The disinfectant water sample and residual chlorine reagent are mixed and reacted in the second mixing unit 45. The reaction solution comes out of the second mixing unit 45 and enters the detection unit 46 through the sample pipeline to be tested.

[0148] 6. The detection unit 46 includes a light source, a filter, and a photodetector. The detection unit 46 measures the residual chlorine content of the sample, including the free chlorine value and the total chlorine value.

[0149] 7. The above process continues until the residual chlorine levels of the chlorinated disinfection samples with the set series of gradient concentrations are detected, and a series of raw data (chlorine dosage, residual chlorine level) are obtained.

[0150] 8. The raw data of (chlorine addition amount, residual chlorine amount) are processed and optimized in the correction unit 47 to obtain the curve data of (chlorine addition amount, residual chlorine amount);

[0151] 9. Curve fitting unit 48 uses the least squares method to fit the (chlorine addition amount, residual chlorine amount) curve data to obtain chlorination curve information: chlorine addition amount - total chlorine curve and curve formula y1=f(x1), chlorine addition amount - free chlorine curve and curve formula y2=f(x2).

[0152] Furthermore, it also includes an online ammonia monitoring module 10, a storage module 11, and a communication module 12, with the control module 1 communicating with the online ammonia monitoring module 10, the storage module 11, and the communication module 12.

[0153] In this embodiment, the ammonia online monitoring module 10 is used to monitor and transmit the ammonia concentration of the raw water, obtain the ammonia concentration value of the raw water, and transmit it to the control module 1. The monitoring cycle is less than or equal to 1 hour. The storage module 11 is used to store the set parameters, chlorination curve information, optimal dosage, curve quality assessment results, disinfection control evaluation level, and other information in a preset format document. The communication module 12 is used to connect the control module 1 to other platforms, such as the water plant's existing central control system or a mobile app, to facilitate the timely remote transmission of information such as dosage and disinfection control quality to the manager.

[0154] Furthermore, this application provides a specific embodiment as follows:

[0155] (a) Setting parameters:

[0156] (1) Number of concentration points for gradient chlorination: 12;

[0157] (2) Chlorine concentrations for each gradient: 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12 mg / L;

[0158] (3) Automatic acquisition cycle of chlorination curve: 30 min;

[0159] (4) Residual chlorine control requirements for 10-minute disinfection contact of filtered water

[0160] 1. Disinfection with free chlorine

[0161] First target value for free chlorine FC 1目标 =1.5 mg / L;

[0162] First upper limit of free chlorine FC 1上限 =2.0 mg / L;

[0163] The first lower limit of free chlorine FC 1下限 =1.0 mg / L;

[0164] 2. Total chlorine disinfection

[0165] First Total Chlorine Target Value TC 1目标 =1.8 mg / L;

[0166] First total chlorine limit TC 1上限 =2.4 mg / L;

[0167] First total chlorine lower limit TC 1下限 =1.2 mg / L;

[0168] (5) Requirements for residual chlorine control in the effluent from the clear water tank

[0169] 1. Disinfection with free chlorine

[0170] Second target value for free chlorine FC 2目标 =0.8 mg / L;

[0171] Second upper limit of free chlorine FC 2上限 =1.2 mg / L;

[0172] Second lower limit of free chlorine FC 2下限 =0.5 mg / L;

[0173] 2. Total chlorine disinfection

[0174] Second Total Chlorine Target Value TC 2目标 =1.0 mg / L;

[0175] Second total chlorine limit value TC 2上限 =1.5 mg / L;

[0176] Second total chlorine lower limit TC 2下限 =0.7 mg / L;

[0177] (6) Time span for data required for disinfection control quality evaluation: 10 days;

[0178] (II) Obtaining chlorination curve information

[0179] The sampling unit receives filtered water and takes 10 mL of water sample, which is then introduced into the first mixing unit through the water sample pipeline. The disinfectant addition unit operates a peristaltic pump to add sodium hypochlorite solution, achieving a chlorination concentration of 0.5 mg / L, which is then introduced into the first mixing unit through the disinfectant pipeline. The two solutions are mixed and reacted in the first mixing unit. The disinfected water sample exiting the first mixing unit is divided into two equal streams: one stream enters the first mixing unit (first mixing unit) through disinfectant sample pipeline ①, and the other stream enters the second mixing unit (second mixing unit) through disinfectant sample pipeline ②.

[0180] The reagent addition unit adds free chlorine detection reagent (effective reaction component DPD content is 0.02g) to the second mixing unit ① and total chlorine detection reagent (effective reaction component DPD content is 0.02g) to the second mixing unit ②. The mixture is mixed and reacted. The reaction solution enters the test units ① and ② respectively through the test sample pipelines ① and ② to obtain the free chlorine value and total chlorine value of the sample. Three measurements are read for each sample.

[0181] The above process is repeated until the chlorine concentrations of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 12 mg / L are also completed, and a series of raw data (chlorine dosage and residual chlorine dosage) are obtained.

[0182] The raw data (chlorine dosage, residual chlorine dosage) are processed and optimized in the correction unit to remove outliers and obtain the curve data (chlorine dosage, residual chlorine dosage).

[0183] (Chlorination dosage, total chlorine) curve data:

[0184] (0.5, 0.46), (1, 0.95), (2, 1.9), (3, 2.74), (4, 3.65), (5, 3.81), (6, 2.20), (7, 0.62), (8, 1.65), (9, 2.95), (10, 4.36), (12, 6.43);

[0185] (Chlorination dosage, free chlorine) curve data:

[0186] (0.5, 0.04), (1, 0.05), (2, 0.05), (3, 0.05), (4, 0.06), (5, 0.07), (6, 0.08), (7, 0.21), (8, 1.26), (9, 2.57), (10, 4.02), (12, 6.15);

[0187] The curve fitting unit uses the least squares method to fit the curve data, obtaining the chlorination curve information: chlorination amount-total chlorine curve and curve formula y1=f(x1), chlorination amount-free chlorine curve and curve formula y2=f(x2), where please refer to... Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the chlorination dosage versus total chlorine curve. Figure 6 This is a schematic diagram of the chlorination amount versus free chlorine curve.

[0188] y1 = -0.0108·x 15 +0.1489·x 14 -0.7667·x 13 +1.7845·x 12 -0.929 x 1 + 0.5028

[0189] 0 < x1 ≤ 6;

[0190] y1 = 0.0329·x 14 -1.2696·x 13 +1.0733·x 12 -112.43·x1+255.33, 6<x1≤12;

[0191] y2 = -0.0006·x 25 +0.0158·x 24 -0.1363·x 23 +0.4768·x 22 -0.6412·x2+0.2851;

[0192] (III) Calculating the optimal dosage

[0193] Based on the curve information, the peak value of the chlorination amount-total chlorine curve is (5, 3.94);

[0194] Because Y 1峰 =3.94>TC 2目标 =1.0, then the disinfection method is total chlorine disinfection. Substitute 1.0 as the value of y1 into the curve formula y1=f(x1), and the obtained x1 has 3 values: 1.3, 6.5 and 7.6. Take the smallest one, 1.3mg / L, as the optimal chlorine dosage.

[0195] The current inflow rate of the clear water tank is 2000 m³ / h. 3 / h, the disinfectant is a 5% sodium hypochlorite solution with a density of 1.04 g / mL;

[0196] The optimal chlorination rate is calculated based on the optimal dosage. The optimal dosage is calculated as follows: Optimal dosage = 1.3 × 2000 ÷ (0.05 × 1.04 × 1000) = 50 L / h.

[0197] (iv) Control of chlorination

[0198] The control module uses the optimal dosage as the core data and sends dosing instructions to the chlorine dosing module;

[0199] The chlorine dosing module drives the chlorine metering pump to add chlorine at a rate of 50L / h;

[0200] (v) Assessing the quality of the chlorination curve

[0201] Since the current disinfection method is total chlorine disinfection, the control line of the curve quality control chart is as follows:

[0202] First target limit: Residual chlorine value = TC 1目标 =1.8 mg / L;

[0203] First upper warning limit: Residual chlorine value = TC 1目标 +(TC 1上限 -TC 1目标 ) / 2 = 2.1 mg / L;

[0204] Upper control limit: Residual chlorine value = TC 1上限 =2.4 mg / L;

[0205] First lower warning limit: Residual chlorine value = TC 1目标 +(TC 1下限 -TC 1目标 ) / 2 = 1.5 mg / L;

[0206] Lower control limit: Residual chlorine value = TC 1下限 =1.2 mg / L;

[0207] The curve quality dynamic evaluation module receives the first total chlorine measurement value from the residual chlorine online monitoring module, with a value every 3 minutes: 1.88 mg / L, 1.82 mg / L, 1.79 mg / L, 1.83 mg / L, 1.68 mg / L, 1.75 mg / L, 1.88 mg / L, 1.92 mg / L...;

[0208] Since the values ​​of "1.68 mg / L, 1.75 mg / L, 1.88 mg / L, and 1.92 mg / L" meet the criteria of "the values ​​fall within the first upper warning line and the first lower warning limit, but the four consecutive measured values ​​increase monotonically, and the difference between two adjacent measured values ​​exceeds 0.02 mg / L", the evaluation result is to update the chlorination curve.

[0209] The control module receives the evaluation results and sends a command to the chlorination curve acquisition module to initiate a series of actions to acquire the chlorination curve; the optimal dosage remains unchanged until the latest optimal dosage is obtained.

[0210] The curve quality dynamic evaluation module continuously evaluates the curve quality; if new and different evaluation results appear in the next evaluation, the chlorination curve is updated; if the chlorination amount needs to be adjusted during the chlorination curve update, the optimal chlorination amount is adjusted according to the chlorination adjustment plan; then the control module receives and responds to the new evaluation results.

[0211] (vi) Evaluating the quality of disinfection control

[0212] Since the current disinfection method is total chlorine disinfection, the control lines for the disinfection control quality chart are as follows:

[0213] Second target limit: Residual chlorine value = TC 2目标 =1.0 mg / L;

[0214] Second upper warning limit: Residual chlorine value = TC 2目标 +(TC 2上限 -TC 2目标 ) / 2 = 1.25 mg / L;

[0215] Second lower warning limit: Residual chlorine value = TC 2目标 +(TC 2下限 -TC 2目标 ) / 2 = 0.85 mg / L;

[0216] The disinfection control quality evaluation module receives the second total chlorine measurement value output from the residual chlorine online monitoring module, one value every 3 minutes. It uses 4800 measurements from the most recent 10 days for disinfection control evaluation. After removing invalid values ​​such as sudden spikes or drops, and negative values, it checks the position of the measurement value on the quality graph. If it falls within the second upper warning limit and the second lower warning limit, and the calculated coefficient of variation is 9.83%, then the control quality is rated as Grade A. This grade is returned to the control module as the evaluation result and displayed to the manager.

[0217] This invention provides a chlorination control method and system. The method includes: acquiring parameter information, the parameter information including at least curve data of a chlorination curve, the residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank; the curve data of the chlorination curve including at least the peak value of the chlorination amount-total chlorine curve, and the residual chlorine value of the effluent from the clear water tank including the target residual chlorine value; obtaining the optimal chlorination amount and the optimal dosage through the peak value of the chlorination amount-total chlorine curve, the target residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank; and adding chlorine to the influent pipe of the clear water tank according to the optimal dosage, wherein the filtered water enters the clear water tank through the influent pipe. The invention describes a clear water tank; it constructs a curve quality control chart and acquires multiple first measurement data points of residual chlorine in the filtered water after chlorination disinfection. The chlorination curve is evaluated using the curve quality control chart and the multiple first measurement data points to obtain an evaluation result. Based on the evaluation result, the chlorination curve is updated, and the optimal chlorination dosage and optimal injection rate are adjusted according to the updated chlorination curve. A disinfection control quality chart is constructed, and multiple second measurement data points of residual chlorine in the effluent from the clear water tank are acquired. The quality is evaluated based on the multiple second measurement data points and the disinfection control quality chart to obtain and display the control quality level. The chlorination control method provided by this invention calculates the optimal injection rate using the acquired parameter information, adds chlorine according to the optimal injection rate, and updates and adjusts the chlorine injection rate to achieve automatic chlorination control without relying on professional technicians. It also achieves effective chlorination control, avoiding chlorination lag or over-chlorination. Furthermore, through data analysis, it enables long-term monitoring and evaluation of disinfection control quality, identifies potential problems and areas for improvement, and ensures continuous improvement in water supply disinfection safety.

[0218] In the various embodiments of this invention, the functional modules can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0219] Based on this understanding, the technical solutions of this invention, in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0220] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps can be performed in other orders or simultaneously according to the present invention. Secondly, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention. In the above embodiments, the descriptions of each embodiment have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0221] For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A chlorination control method, characterized in that, The method includes: Obtain parameter information, which includes at least the curve data of the chlorination curve, the residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank. The curve data of the chlorination curve includes at least the peak value of the chlorination amount-total chlorine curve, and the residual chlorine value of the effluent from the clear water tank includes the target value of the residual chlorine value of the effluent from the clear water tank. The optimal chlorination dosage and optimal addition amount are obtained by using the peak value of the chlorination dosage-total chlorine curve, the target residual chlorine value of the effluent from the clear water tank, and the influent flow rate of the clear water tank. Chlorination is then added to the influent pipe of the clear water tank according to the optimal addition amount. Filtered water enters the clear water tank through the influent pipe. The peak value (X) of the chlorination dosage-total chlorine curve is obtained by taking the first and second derivatives of the curve. 1峰 Y 1峰 ); Compare the peak values ​​(X) of the chlorination dosage-total chlorine curve. 1峰 Y 1峰 The disinfection method is determined based on the residual chlorine target value of the effluent from the clear water tank, and the optimal chlorination dosage is calculated according to the disinfection method. The parameter information also includes the first free chlorine target value FC. 1目标 and the first total chlorine target value TC 1目标 The target value for residual chlorine in the effluent from the clear water tank includes a second target value for free chlorine, FC. 2目标 Second total chlorine target value TC 2目标 The chlorination curve data also includes the chlorination amount-total chlorine curve formula y1=f(x1) and the chlorination amount-free chlorine curve formula y2=f(x2). If Y 1峰 >TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the chlorination amount-total chlorine curve formula y1=f(x1), where: If the number of obtained x1 values ​​is greater than 1, then the smallest x1 value is taken as the optimal chlorination amount; If the number of x1 values ​​obtained is 1, then the obtained x1 value is the optimal chlorination amount; If Y 1峰 =TC 2目标 The disinfection method is total chlorine disinfection, and TC is used. 2目标 Substituting the value of y1 into the chlorination amount-total chlorine curve formula y1=f(x1), we obtain the value of x1. The smallest x1 value is taken as the optimal chlorination amount. If Y 1峰 <TC 2目标 The disinfection method is free chlorine disinfection, which involves FC. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount. If the peak value of the chlorine dosage-total chlorine curve is not present, then the disinfection method is free chlorine disinfection, and FC is used. 2目标 Substituting the value of y2 into the chlorination amount-free chlorine curve formula y2=f(x2), we obtain the value of x2, which is the optimal chlorination amount. The optimal dosage is obtained by combining the chlorination dosage-total chlorine curve and the influent flow rate of the clear water tank. Specifically, the optimal dosage = (optimal chlorination dosage × influent flow rate of the clear water tank) ÷ (effective chlorine concentration of sodium hypochlorite solution × density of sodium hypochlorite solution × 1000); where the unit of the optimal dosage is L / h; the unit of the optimal chlorination dosage is mg / L; and the unit of the influent flow rate of the clear water tank is m³ / h. 3 / h; Effective chlorine concentration of sodium hypochlorite solution: mass fraction; Density of sodium hypochlorite solution: g / mL; 1000 is the unit conversion factor; A quality control curve is constructed, and multiple first measurement data of residual chlorine in the filtered water after chlorination disinfection are obtained. The chlorination curve is evaluated using the quality control curve and the multiple first measurement data to obtain an evaluation result. The chlorination curve is updated based on the evaluation result, and the optimal chlorination amount and the optimal dosage are adjusted based on the updated chlorination curve. A disinfection control quality map is constructed, and multiple second measurement data of residual chlorine in the effluent of the clear water tank are obtained. Based on the multiple second measurement data and the disinfection control quality map, a quality evaluation is performed to obtain the control quality level and display it.

2. The chlorination control method according to claim 1, characterized in that, The first measurement data includes a first free chlorine measurement value and a first total chlorine measurement value, and the parameter information also includes a first free chlorine upper limit value FC. 1上限 The first lower limit of free chlorine FC 1下限 First total chlorine limit TC 1上限 and the first total chlorine lower limit TC 1下限 The process involves constructing a quality control curve and acquiring multiple first measurement data points of residual chlorine in the filtered water after chlorination disinfection. The chlorination curve is then evaluated using the quality control curve and the multiple first measurement data points to obtain an evaluation result. The chlorination curve is updated based on the evaluation result. This process includes: The curve quality control chart is constructed according to the disinfection method. The horizontal axis of the curve quality control chart is the time axis, the vertical axis is the residual chlorine axis, and it includes multiple control lines parallel to the time axis, namely the first target limit, the first upper warning limit, the upper control limit, the first lower warning limit, and the lower control limit. When the disinfection method is free chlorine disinfection, the residual chlorine value of the first target limit = FC 1目标 The residual chlorine value of the first upper warning limit = FC 1目标 +(FC 1上限 -FC 1目标 )·n / m, where m is 2 and n is 1; the residual chlorine value at the upper control limit = FC 1上限 The residual chlorine value of the first lower warning limit = FC 1目标 +(FC 1下限 -FC 1目标 )·q / p, where p is 2 and q is 1; the residual chlorine value of the lower control limit = FC 1下限 ,in: If any of the first free chlorine measurements exceeds the upper control limit or falls below the lower control limit, the chlorination curve is updated. If all the first free chlorine measurement values ​​fall within the first upper warning limit and the first lower warning limit, but i consecutive first free chlorine measurement values ​​increase monotonically or decrease monotonically, and the difference between two adjacent measurement values ​​exceeds a preset difference, then the chlorination curve is updated, where i is a positive integer greater than or equal to 4. If the first free chlorine measurement value falls between the first upper warning limit and the upper control limit, or between the first lower warning limit and the lower control limit, and at least one of the first two measured values ​​of the first free chlorine also falls between the corresponding first upper warning limit and the upper control limit, and between the first lower warning limit and the lower control limit, then the chlorination curve is updated. When the disinfection method is total chlorine disinfection, the residual chlorine value at the first target limit = TC 1目标 The residual chlorine value at the first upper warning limit = TC 1目标 +(TC) 1上限 -TC 1目标 )·n´ / m´, where m´ is 2 and n´ is 1; the residual chlorine value at the upper control limit = TC 1上限 The residual chlorine value of the first lower warning limit = TC 1目标 +(TC) 1下限 -TC 1目标 )·q´ / p´, where p´ is 2 and q´ is 1; the residual chlorine value of the lower control limit = TC 1下限 ,in: If any of the first total chlorine measurements exceeds the upper control limit or falls below the lower control limit, the chlorination curve is updated. If all the first total chlorine measurements fall within the first upper warning limit and the first lower warning limit, but j consecutive first total chlorine measurements monotonically increase or monotonically decrease, and the difference between two adjacent measurements exceeds a preset difference, then the chlorination curve is updated, where j is a positive integer greater than or equal to 4. If the first total chlorine measurement falls between the first upper warning limit and the upper control limit, or between the first lower warning limit and the lower control limit, and at least one of the first two measurements of the first total chlorine also falls between the corresponding first upper warning limit and the upper control limit, and the first lower warning limit and the lower control limit, then the chlorination curve is updated; and When the evaluation results show that the chlorination curve is of normal quality, the chlorination curve is continuously evaluated.

3. The chlorination control method according to claim 2, characterized in that, The second measurement data includes a second free chlorine measurement value and a second total chlorine measurement value, and the residual chlorine value of the effluent also includes a second upper limit value of free chlorine FC. 2上限 Second free chlorine lower limit FC 2下限 Second total chlorine limit TC 2上限 Second total chlorine lower limit TC 2下限 The process of constructing a disinfection control quality map, acquiring multiple second measurement data points of residual chlorine in the effluent from the clear water tank, and performing a quality evaluation based on the multiple second measurement data points and the disinfection control quality map to obtain and display the control quality level includes: The disinfection control quality chart is constructed based on the disinfection method. The horizontal axis of the disinfection control quality chart is the time axis, the vertical axis is the residual chlorine axis, and it also includes multiple control lines parallel to the time axis, namely the second target limit, the second upper warning limit, and the second lower warning limit. When the disinfection method is free chlorine disinfection, the residual chlorine value of the second target limit = FC 2目标 The residual chlorine value of the second upper warning limit = FC 2目标 +(FC 2上限 -FC 2目标 )·j / h, where h is 2 and j is 1; the residual chlorine value of the second lower warning limit = FC 2目标 +(FC 2下限 -FC 2目标 )·s / r, where r is 2 and s is 1, and: If all the second free chlorine measurements are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A; If all the second free chlorine measurements are within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B. If the second free chlorine measurement value is outside the second upper warning limit and the second lower warning limit, the control quality level is Class C; When the disinfection method is total chlorine disinfection, the residual chlorine value of the second target limit = TC 2目标 The residual chlorine value at the second upper warning limit = TC 2目标 +(TC) 2上限 -TC 2目标 )·j´ / h´, where h´ is 2 and j´ is 1; the residual chlorine value of the second lower warning limit = TC 2目标 +(TC) 2下限 -TC 2目标 )·s´ / r´, where r´ is 2 and s´ is 1, and: If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is <20%, then the control quality level is Grade A; If all the second total chlorine measurements fall within the second upper warning limit and the second lower warning limit, and the coefficient of variation is ≥20%, then the control quality level is Grade B. If the second total chlorine measurement value falls outside the second upper warning limit and the second lower warning limit, the control quality level is Grade C.

4. The chlorination control method according to claim 3, characterized in that, The coefficient of variation is calculated as follows: Where n is the amount of data; T i The i-th measurement value of the second free chlorine measurement value or the second total chlorine measurement value; This is the average of all the second free chlorine measurements and the second total chlorine measurements.

5. The chlorination control method according to claim 1, characterized in that, The step of adding chlorine to the inlet pipe of the clear water tank according to the optimal dosage further includes: Periodically monitor the ammonia concentration in the raw water; If the change in the ammonia concentration of the raw water exceeds ±0.1 mg / L, the chlorination curve should be updated immediately, and the acquisition cycle of the chlorination curve should be adjusted. If the change in the ammonia concentration of the raw water is within ±0.05 mg / L, the acquisition cycle of the chlorination curve will be adjusted to the user setting.

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