Carbon source dynamic adjustment method and device, electronic equipment and medium

Abstract

The application discloses a carbon source dosing dynamic adjustment method and device, electronic equipment and medium. The method comprises the following steps: monitoring calculation data in real time, setting a time interval; calculating the volume dosing concentration of the carbon source every time the time interval is reached; calculating the carbon source dosing flow according to the volume dosing concentration of the carbon source; taking the carbon source dosing flow as a target value, adjusting the frequency of the dosing pump through PID control, coupling the target value to realize dynamic adjustment. The application realizes different dosing modes according to different production conditions by setting different parameters according to actual conditions, and realizes automatic control of carbon source dosing by simulating the carbon source dosing flow and then outputting the carbon source dosing flow to the dosing pump for PID frequency adjustment, and adjusts the appropriate interval calculation time to update the new production data in time, so that the total nitrogen in the effluent is stably controlled in the control interval, and the effect of optimizing carbon source dosing and stabilizing the effluent quality is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and more particularly to a carbon source dosing dynamic adjustment method and device, an electronic device and a medium. BACKGROUND

[0002] With the improvement of people's living standards, the requirement for ecological environment is also getting higher and higher, and the requirement for effluent water quality of sewage treatment plant is also getting higher and higher. The sewage treatment plant is responsible for collecting domestic sewage and purifying pollutants therein. The main pollutants in sewage are COD, ammonia nitrogen, total nitrogen, total phosphorus and SS, etc. With the improvement of water quality standards, the original secondary treatment process of a large number of sewage treatment plants cannot meet the requirements of effluent water quality, so it needs to be upgraded and reconstructed for deep treatment. After the secondary treatment process, the COD and ammonia nitrogen in the secondary effluent water quality have been almost consumed, and the main pollutants are total nitrogen, total phosphorus and a small amount of SS.

[0003] The total nitrogen in the effluent of the sewage treatment plant mainly includes ammonia nitrogen, organic nitrogen, nitrate nitrogen, nitrite nitrogen and nitrogen oxide compounds. After purification by each treatment unit of the sewage treatment plant, the total nitrogen in the effluent is mainly nitrate nitrogen, and there is also a small part of ammonia nitrogen and organic nitrogen, etc., so the concentration level of total nitrogen in sewage treatment can be reflected by the nitrate nitrogen data. The removal level of total nitrogen in sewage can be characterized by the removal of nitrate nitrogen.

[0004] In order to remove the nitrate nitrogen in the secondary effluent, biological filter and other processes are generally used for biological denitrification treatment. Since the COD in the secondary effluent is very small at this time, there is almost no easily biologically available carbon source, so external carbon source is needed for denitrification. The current carbon source dosing of deep treatment unit is generally by fixed frequency dosing of dosing pump, and due to the frequent fluctuation of water quantity and water quality, in order to ensure that the effluent meets the standard, the carbon source needs to be frequently adjusted manually or overdosed to ensure that the total nitrogen value of the effluent is within the control range. In addition, due to objective conditions, the experience and methods of different people adjusting are quite different, and there is generally a certain lag, which causes problems such as waste of carbon source or large fluctuation of effluent.

[0005] Therefore, it is necessary to develop a carbon source dosing dynamic adjustment method, device, electronic device and medium.

[0006] The information disclosed in the background section of the present application is only intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0007] The application provides a carbon source dosing dynamic adjustment method and device, electronic equipment and medium, which can collect online water in and out, simulate calculation, output simulated carbon source dosing flow under current production conditions, and then output to a dosing pump for PID frequency adjustment, so that automatic regulation and control of carbon source dosing is realized, appropriate interval calculation time is adjusted, and new production data is updated in time, so that total nitrogen in effluent is stably controlled in a control interval, and the effects of optimizing carbon source dosing and stably controlling effluent quality are achieved.

[0008] In a first aspect, the embodiments of the present disclosure provide a carbon source dosing dynamic adjustment method, comprising:

[0009] Real-time monitoring calculation data, and setting a time interval;

[0010] Every time the time interval is reached, the volume dosing concentration of the carbon source is calculated;

[0011] According to the volume dosing concentration of the carbon source, the carbon source dosing flow is calculated;

[0012] The carbon source dosing flow is taken as a target value, the frequency of the dosing pump is adjusted through PID control of the dosing pump, the target value is coupled and matched, and dynamic adjustment is realized.

[0013] Preferably, the calculation data comprises the concentration of nitrate nitrogen in the influent, the concentration of nitrate nitrogen in the effluent, the concentration of nitrite nitrogen in the influent, the concentration of dissolved oxygen in the influent, the average concentration of nitrate nitrogen in the recent influent, the influent flow, the reagent concentration of the carbon source, and the reagent density of the carbon source.

[0014] Preferably, the volume dosing concentration of the carbon source is calculated through formula (1):

[0015] C 药 =C 进 -C 设 )+P2·C 亚硝进 +P3·C DO +K2·P1(C 出 -C 设 )+K3·P1(C 平均 -C 设 ) (1)

[0016] Wherein, C 药 is the volume dosing concentration of the carbon source, C 进 is the concentration of nitrate nitrogen in the influent, C 出 is the concentration of nitrate nitrogen in the effluent, C 设 is the set target concentration of nitrate nitrogen in the effluent, C 亚硝进 is the concentration of nitrite nitrogen in the influent, C DO is the concentration of dissolved oxygen in the influent, and C 平均The average concentration of recent influent nitrate nitrogen is K1, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the influent nitrate nitrogen concentration, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the effluent nitrate nitrogen concentration, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of recent influent nitrate nitrogen, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, and P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water.

[0017] Preferably, the value range of K1, K2 and K3 is 0-10.

[0018] Preferably, if the value range of K1 is 1-10, the values of K2 and K3 are 0, and the influent nitrate nitrogen concentration is included in the influencing factors of the carbon source dosing flow rate.

[0019] If the value range of K1 and K2 is 1-10, and the value of K3 is 0, the influent and effluent nitrate nitrogen concentrations are included in the influencing factors of the carbon source dosing flow rate.

[0020] If the value of K1 is 0, and the value range of K2 and K3 is 1-10, the effluent nitrate nitrogen concentration and the average value of recent influent nitrate nitrogen are included in the influencing factors of the carbon source dosing flow rate.

[0021] If the values of K1 and K2 are 0, and the value range of K3 is 1-10, the average value of recent influent nitrate nitrogen is included in the influencing factors of the carbon source dosing flow rate.

[0022] Preferably, the carbon source dosing flow rate is calculated by formula (2):

[0023] Q 药 = Q 进水 × C 药 × ω 药 × ρ 药 (2)

[0024] Wherein, Q 药 is the carbon source dosing flow rate, Q 进水 is the influent flow rate, C 药 is the volumetric dosing concentration of carbon source, ω 药 is the medicament concentration of carbon source, and ρ 药 is the medicament density of carbon source.

[0025] Preferably, it further comprises:

[0026] Monitoring the influent COD value to prevent the sudden increase of influent carbon source caused by high COD concentration of incoming water, which affects the calculation of carbon source dosing flow rate.

[0027] In a second aspect, the present disclosure further provides a carbon source dynamic adjustment device, comprising:

[0028] an influent flow meter arranged on the influent passage;

[0029] an influent nitrate nitrogen concentration meter and an effluent nitrate nitrogen concentration meter arranged on the influent passage and the effluent passage, respectively;

[0030] The influent flow meter, the influent nitrate nitrogen concentration meter and the effluent nitrate nitrogen concentration meter are used for real-time monitoring and calculation of data.

[0031] a deep treatment unit structure for treating sewage;

[0032] a carbon source dosing pump connected to the carbon source storage tank and the deep treatment unit structure, for adding carbon source in the carbon source storage tank to the deep treatment unit structure;

[0033] a carbon source addition flow meter connected to the carbon source dosing pump, for measuring carbon source addition flow;

[0034] a carbon source addition automatic control system terminal in communication connection with the influent flow meter, the influent nitrate nitrogen concentration meter, the effluent nitrate nitrogen concentration meter and the carbon source dosing pump, to realize the following steps:

[0035] setting a time interval;

[0036] calculating the volume of carbon source dosing concentration according to the calculation data every time the time interval is reached;

[0037] calculating the carbon source addition flow according to the volume of carbon source dosing concentration;

[0038] adjusting the frequency of the carbon source dosing pump through PID control of the carbon source dosing pump, coupling the target value to realize dynamic adjustment.

[0039] Preferably, the calculation data includes the concentration of nitrate nitrogen in the influent, the concentration of nitrate nitrogen in the effluent, the concentration of nitrite nitrogen in the influent, the concentration of dissolved oxygen in the influent, the average concentration of recent influent nitrate nitrogen, the influent flow, the concentration of carbon source medicament and the density of carbon source medicament.

[0040] Preferably, the volume of carbon source dosing concentration is calculated by formula (1):

[0041] C 药 =K1·P1(C 进 -C 设 )+P2·C 亚硝进 +P3·C DO +K2·P1(C出 -C 设 )+K3·P1(C 平均 -C 设 ) (1)

[0042] wherein, C 药 is the volume dosing concentration of carbon source, C 进 is the concentration of nitrate nitrogen in influent, C 出 is the concentration of nitrate nitrogen in effluent, C 设 is the set target concentration of nitrate nitrogen in effluent, C 亚硝进 is the concentration of nitrite nitrogen in influent, C DO is the concentration of dissolved oxygen in influent, C 平均 is the average concentration of nitrate nitrogen in recent influent, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in influent, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in effluent, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of nitrate nitrogen in recent influent, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, and P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water.

[0043] Preferably, the value range of K1, K2 and K3 is 0-10.

[0044] Preferably, if the value range of K1 is 1-10, the values of K2 and K3 are 0, the influencing factors of the carbon source dosing flow rate include the concentration of nitrate nitrogen in influent;

[0045] if the value range of K1 and K2 is 1-10, the value of K3 is 0, the influencing factors of the carbon source dosing flow rate include the concentrations of nitrate nitrogen in influent and effluent;

[0046] if the value of K1 is 0, the value range of K2 and K3 is 1-10, the influencing factors of the carbon source dosing flow rate include the concentration of nitrate nitrogen in effluent and the average concentration of nitrate nitrogen in recent influent;

[0047] if the values of K1 and K2 are 0, the value range of K3 is 1-10, the influencing factors of the carbon source dosing flow rate include the average concentration of nitrate nitrogen in recent influent.

[0048] Preferably, the carbon source dosing flow rate is calculated by formula (2):

[0049] Q 药 = Q 进水 × C 药 × ω 药 × ρ 药 (2)

[0050] wherein, Q药 Q is the carbon source dosing flow rate 进水 C is the influent flow rate 药 ω is the carbon source volumetric dosing concentration 药 ρ is the carbon source medicament concentration 药 ρ is the carbon source medicament density.

[0051] Preferably, further comprising:

[0052] Monitoring the influent COD value prevents the sudden increase of the influent carbon source caused by the high COD concentration of the incoming water, and affects the calculation of the carbon source dosing flow rate.

[0053] In a third aspect, the embodiments of the present disclosure also provide an electronic device, which comprises:

[0054] a memory storing executable instructions;

[0055] a processor running the executable instructions in the memory to implement the carbon source dosing dynamic adjustment method.

[0056] In a fourth aspect, the embodiments of the present disclosure also provide a computer readable storage medium storing a computer program, which is executed by a processor to implement the carbon source dosing dynamic adjustment method.

[0057] The beneficial effects are as follows:

[0058] (1) The present application can realize the automatic adjustment of carbon source dosing according to online water quality values, finely adjust the carbon source dosing, prevent the waste of carbon source caused by excessive dosing, save medicament costs, control the concentration range of effluent nitrate nitrogen according to the situation, realize fine regulation and control, and avoid the hysteresis and large fluctuations of manual adjustment.

[0059] (2) The present application can realize the front feedback dosing mode, the rear feedback dosing mode, the front and rear feedback optimized dosing mode, and the fixed dosing rate dosing mode by adjusting different correction coefficients, so as to cope with different production situations.

[0060] The method and device of the present application have other characteristics and advantages, which will be apparent or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together serve to explain the specific principles of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0061] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views, and wherein the exemplary embodiments of the present application are shown and described.

[0062] Figure 1 A schematic diagram of PID control is shown according to one embodiment of the present application.

[0063] Figure 2 A flow chart showing steps of a carbon source dosing dynamic adjustment method according to one embodiment of the present application.

[0064] Figure 3 A schematic diagram of a carbon source dosing dynamic adjustment device according to one embodiment of the present application is shown.

[0065] BRIEF DESCRIPTION OF DRAWINGS

[0066] 1, water inflow meter; 2, advanced treatment unit structure; 3, water inflow nitrate nitrogen concentration meter; 4, carbon source dosing flow meter; 5, carbon source dosing pump; 6, carbon source storage tank; 7, water outflow nitrate nitrogen concentration meter; 8, carbon source dosing automatic control system terminal. DETAILED DESCRIPTION

[0067] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0068] The present application provides a carbon source dosing dynamic adjustment method, comprising:

[0069] Real-time monitoring calculation data, setting time interval;

[0070] Every time interval, calculating the volume dosing concentration of carbon source;

[0071] According to the volume dosing concentration of carbon source, calculating the carbon source dosing flow rate;

[0072] Taking the carbon source dosing flow rate as the target value, adjusting the dosing pump frequency through the dosing pump PID control, coupling the target value to realize dynamic adjustment.

[0073] In one example, the calculation data includes the concentration of nitrate nitrogen in the water inflow, the concentration of nitrate nitrogen in the water outflow, the concentration of nitrite nitrogen in the water inflow, the concentration of dissolved oxygen in the water inflow, the average concentration of recent water inflow nitrate nitrogen, water inflow, carbon source reagent concentration, carbon source reagent density.

[0074] In one example, the volume dosing concentration of carbon source is calculated by formula (1):

[0075] C 药 = K1·P1(C 进 -C 设 ) + P2·C 亚硝进 + P3·CDO + K2 P1(C 出 - C 设 + K3 P1(C 平均 - C 设 ) (1)

[0076] wherein C 药 is the volume dosing concentration of the carbon source, C 进 is the concentration of nitrate nitrogen in the influent, C 出 is the concentration of nitrate nitrogen in the effluent, C 设 is the set target concentration of nitrate nitrogen in the effluent, C 亚硝进 is the concentration of nitrite nitrogen in the influent, C DO is the concentration of dissolved oxygen in the influent, C 平均 is the average concentration of nitrate nitrogen in the recent influent, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the influent, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the effluent, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of nitrate nitrogen in the recent influent, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water, the value range of P1, P2 and P3 is the corresponding theoretical numerical constant, the value of P1 is assigned according to K1, K2 and K3, and the influencing factors of the carbon source dosing flow include the concentration of nitrate nitrogen in the influent, the concentration of nitrate nitrogen in the effluent or the average value of nitrate nitrogen in the recent influent; the value of P2 and P3 is assigned to indicate that the influencing factors of the carbon source dosing flow include the concentration of nitrite nitrogen in the influent and the concentration of dissolved oxygen in the influent.

[0077] In one example, the value range of K1, K2 and K3 is 0-10.

[0078] In one example, if the value range of K1 is 1-10, the values of K2 and K3 are 0, and the influencing factors of the carbon source dosing flow include the concentration of nitrate nitrogen in the influent.

[0079] If the value range of K1 and K2 is 1-10, and the value of K3 is 0, the influencing factors of the carbon source dosing flow include the concentrations of nitrate nitrogen in the influent and the effluent.

[0080] If the value of K1 is 0, and the value range of K2 and K3 is 1-10, the influencing factors of the carbon source dosing flow include the concentration of nitrate nitrogen in the effluent and the average value of nitrate nitrogen in the recent influent.

[0081] If the values of K1 and K2 are 0, and the value range of K3 is 1-10, the influencing factors of the carbon source dosing flow include the average value of nitrate nitrogen in the recent influent.

[0082] In one example, the carbon source dosage flow rate is calculated by formula (2):

[0083] Q 药 = Q 进水 × C 药 × ω 药 × ρ 药 (2)

[0084] wherein Q 药 is the carbon source dosage flow rate, Q 进水 is the influent flow rate, C 药 is the volumetric dosage concentration of the carbon source, ω 药 is the agent concentration of the carbon source, and ρ 药 is the agent density of the carbon source.

[0085] In one example, it further comprises:

[0086] The influent COD value is monitored to prevent the sudden increase of the influent carbon source caused by the high COD concentration of the incoming water, which affects the calculation of the carbon source dosage flow rate.

[0087] Specifically, online monitoring instruments are arranged in the influent and effluent channels of the advanced treatment unit of the sewage treatment plant to monitor the calculation data in real time, and the calculation data is transmitted to the automatic control system. The instruments arranged at the influent end mainly include: influent flow meter, influent COD online monitoring instrument, influent nitrate nitrogen instrument, effluent nitrate nitrogen instrument, and carbon source dosage flow meter.

[0088] According to the actual production situation and the values of the influent and effluent water quality nitrate nitrogen instruments, the data collection interval is selected to be 15 minutes. The monitoring period of the water quality instrument can be adjusted according to the actual situation. The influent and effluent nitrate nitrogen instruments can quickly detect the values of nitrate nitrogen in the influent and effluent. The total nitrogen in the secondary treatment effluent is mostly nitrate nitrogen, which can be indicated by the value of nitrate nitrogen to indicate the level of total nitrogen in the influent and effluent. The dissolved oxygen carried by the influent, a small amount of nitrite nitrogen existing in the influent due to incomplete oxidation of the front-end treatment unit, and the nitrate nitrogen in the influent and effluent are also considered.

[0089] In order to better control the carbon source dosage, in addition to the theoretical consumption of carbon source amount of DO, nitrate nitrogen, and nitrite nitrogen, correction coefficients of various factors are introduced to match the actual dosage with the simulation value.

[0090] In order to optimize the carbon source dosage and reduce the waste caused by excessive carbon source dosage, the total nitrogen value of the effluent is stabilized in the control interval, which is lower than the upper limit of the safety value of the effluent water quality and higher than the lower limit value of the excessive carbon source dosage. In order to achieve the appropriate effect, the target nitrate nitrogen concentration of the effluent is set to 10 mg / L, which can stabilize the effluent nitrate nitrogen value in the interval of 10-12 mg / L.

[0091] The coefficients of different carbon source dosing utilization vary, which can be calculated according to the actual reagent substitution related coefficients.

[0092] According to the calculation data, the volume dosing concentration of the carbon source is calculated by formula (1). In formula (1), the influent nitrite nitrogen concentration can be brought into the calculation according to the recent manual detection value, and the influent nitrite nitrogen concentration in the advanced treatment unit is generally 0 mg / L; the concentration of dissolved oxygen in the influent can be brought into the calculation according to the recent manual detection value of dissolved oxygen, and the influent dissolved oxygen in the biological filter and other advanced treatment units is generally saturated dissolved oxygen, which can reach 6-8 mg / L.

[0093] In order to match the actual dosing situation, formula (1) adds three correction coefficients K1, K2 and K3 to correct the theoretical value, which can be valued according to experience in actual application, and the value range is 0-10. In addition, due to the influence of factors such as influent temperature, backwashing parameters, influent COD and SS, manual auxiliary adjustment and correction can be made according to the fluctuation of effluent water quality. The output simulation dosing amount obtained after correction is the actual dosing amount output by the dosing pump through PID control frequency, so as to realize the automatic control of the dosing pump.

[0094] K1 is a correction coefficient adjusted according to the influent nitrate nitrogen, and the main instrument is the influent nitrate nitrogen instrument data; K2 is a coefficient adjusted according to the effluent nitrate nitrogen, and the main instrument is the effluent nitrate nitrogen instrument data; K3 is a coefficient adjusted according to the recent average value of the influent nitrate nitrogen, and its value is self-defined input value, which can be used when the influent nitrate nitrogen instrument is abnormal, and can realize constant dosing rate. Different parameter combinations can obtain different dosing logic effects. Specifically as follows:

[0095] 1) K1 is valued as 1-10, K2 and K3 are valued as 0, and the carbon source dosing concentration calculation considers the influent nitrate nitrogen concentration, the influent nitrite nitrogen concentration, and the influent dissolved oxygen. The front feedback adjustment can be realized, and the self-control adjustment can be realized according to the influent water quality and quantity change;

[0096] 2) K1 and K2 are valued as 1-10, K3 is valued as 0, and the calculation of the carbon source dosing concentration mainly considers the influent and effluent nitrate nitrogen instruments, which can realize the front feedback dosing mode and the rear feedback fine adjustment. The dosing control can be realized under double protection, and the control effect is more reliable;

[0097] 3) K1 is assigned as 0, K2 is assigned as 1-10, K3 is assigned as 1-10, the carbon source concentration is calculated mainly considering the effluent nitrate nitrogen instrument, and the post-feedback adjustment can be realized. Meanwhile, the K3 can be used to replace the influent nitrate nitrogen instrument for regulation and control according to the recent average value of the influent nitrate nitrogen, which is suitable for the case of the failure of the influent nitrate nitrogen instrument;

[0098] 4) K1 and K2 are assigned as 0, and K3 is assigned as 1-10, the carbon source concentration is calculated mainly considering the recent average value of the influent nitrate nitrogen concentration, the effect of the fixed dosing rate can be achieved, the relatively stable dosing rate can be realized, and the high-frequency adjustment of the manual operation can be reduced.

[0099] According to different parameter adjustments, the front-end influent instrument feedback control, the rear-end instrument feedback control, or the front-end instrument and feedback control as the main rear-end instrument feedback fine-tuning optimization control mode can be used.

[0100] According to the volume dosing concentration of the carbon source, the carbon source dosing flow is calculated through formula (2). The carbon source dosing adopts the variable frequency flowmeter dosing, the carbon source dosing flow calculated by the PLC is controlled by the PID, and the analog module is output to the frequency converter and other actuators in the form of 4-20mA, and the actual dosing agent flow is adjusted periodically according to the actual flow feedback, and the calculation analog value is matched.

[0101] Figure 1 A schematic diagram of the PID control according to one embodiment of the application is shown.

[0102] The PID regulation is divided into proportional regulation, integral regulation and differential regulation; in the actual control process, due to the delay of the actuator and the measuring device, the system may be a pure lag process. For example, the delay time of the flow control may be as long as more than 10 seconds, and there is a certain reaction time after the carbon source dosing enters the system, and there is also a certain delay in the feedback of the effluent instrument value. This hysteresis often causes the controlled object to produce overshoot or oscillation, causing the system to be not easy to reach a stable process. Therefore, the proportional + integral (PI) controller can make the system have no steady-state error after entering the steady state.

[0103] Proportional control is the simplest control method. The output of the controller is proportional to the input error signal. In order to deal with the hysteresis, we reduce the proportional control value in the carbon source optimization system, so that it retains its function while minimizing the risk of overshoot and oscillation. However, the system output has a steady-state error when the system only has proportional control. In integral control, the output of the controller is proportional to the integral of the input error signal. For the carbon source addition control system, if there is a steady-state error between the actual flow and the calculated value in the positive square range, the control system is said to have a steady-state error. In order to eliminate the steady-state error, the system adds an integral controller function, which depends on the integral of the error over time. As time increases, the integral also increases. This will still cause overshoot or oscillation for flow hysteresis. We also reduce this value, that is, increase the time period, so that it pushes the output of the controller to further reduce the steady-state error until it is equal to zero or within the set dead zone. The PID control of flow, liquid level, and temperature in water treatment cannot be fast in feedback speed, so the derivative control is difficult to play a role. Instead, it increases the risk and amplitude of oscillation and overshoot when there is a problem with flow fluctuation or instrument accuracy, so the derivative controller is not used as the main control in this system.

[0104] The theoretical carbon source addition value is set as the target value of the dosing pump, and then the dosing pump PID control logic is used to adjust the frequency of the dosing pump to match the target value. In order to accurately dose the amount of medicament, the change in medicament flow should match the inflow, and the shorter the interval of the change in medicament flow, the better. Since the inflow booster pump operates at variable frequency according to the pump house liquid level, in order to avoid frequent adjustment of the carbon source addition variable frequency pump due to rapid fluctuations in water quantity, the longer the interval of the change in medicament flow, the better. In order to balance these two points, the time interval of the change in medicament flow can be adjusted according to the actual situation to obtain an optimized adjustment interval of 2 minutes, which can stabilize the equipment and reduce wear and tear without frequent adjustment.

[0105] Under the premise of adjusting the appropriate change interval of the dosing pump, the change conditions are further optimized. Since there is a certain deviation between the target value and the actual value obtained after PID adjustment, in order to stabilize the operation of the dosing pump, the error tolerance value between the current flow value and the target value is set. In this way, when the dosing pump flow value and the target value differ by a value within the error tolerance value allowed range, the dosing pump flow is no longer adjusted, and the calculation and judgment are performed again at the next judgment period.

[0106] In order to ensure the safe operation of the methanol dosing pump, the minimum frequency of the dosing pump is set, which is generally 10 Hz. That is, as long as it is turned on, the minimum methanol dosage cannot be less than this minimum value. When the inflow nitrate nitrogen is lower than the set target value range, the system needs to be manually turned off, otherwise it will be dosed at the minimum flow rate, which will cause a certain amount of excess medicament to be added, resulting in a lower nitrate nitrogen in the effluent.

[0107] The influent water can be provided with a COD instrument, mainly monitoring the influent water COD value, preventing the influent water COD concentration from being too high to cause the sudden increase of the available carbon source, and affecting the calculation of the carbon source agent addition, and the data is not involved in the calculation, to protect the early warning instrument.

[0108] Because the influent and effluent water quality of the biological treatment unit changes in different application scenarios, the water quality and quantity parameters and various parameters need to be adjusted according to the actual operation in different time periods, so that they can adapt to the changes of production conditions, and data accumulation is carried out at the same time, so that the parameters are more in line with the actual production. In this process, a certain time is spent on parameter accumulation and debugging process, so as to realize stable addition of carbon source and stable effluent water quality.

[0109] In order to understand the scheme and effect of the embodiments of the application, four specific application examples are given below. Those skilled in the art should understand that the examples are only for the purpose of facilitating understanding of the application, and any specific details are not intended to limit the application in any way.

[0110] Example 1

[0111] Figure 2 A flow chart showing the steps of the carbon source addition dynamic adjustment method according to an embodiment of the application is shown.

[0112] As Figure 2 shown, the carbon source addition dynamic adjustment method comprises: step 101, real-time monitoring and calculating data, setting a time interval; step 102, calculating the volume dosage concentration of the carbon source every time the time interval is reached; step 103, calculating the carbon source addition flow rate according to the volume dosage concentration of the carbon source; step 104, taking the carbon source addition flow rate as the target value, adjusting the frequency of the dosing pump through PID control of the dosing pump, coupling the target value to realize dynamic adjustment.

[0113] The self-control dosing system is applied to a biological filter unit after secondary treatment of effluent water in a certain reclaimed water plant. Because most of the pollutants in the sewage have been removed by the front-end secondary treatment, the present treatment unit mainly removes total nitrogen in the denitrification biological filter. The influent water quality of the biological filter unit is shown in Table 1.

[0114] Table 1

[0115] Water quality indicators COD Ammonia nitrogen SS Total nitrogen Total phosphorus Concentration range (mg / L) 10-40 0.1-3 2.5-12 8-21 0.05-0.9

[0116] The COD of the biofilter treatment unit is low throughout the year, mainly due to the presence of difficult-to-degrade organic matter, which cannot provide the required carbon source for denitrification. The total nitrogen in the influent is above 15 mg / L for most of the year, slightly higher than the effluent standard of 15 mg / L. In order to ensure stable effluent that meets the standard, it is necessary to continuously add carbon source methanol to control the total nitrogen in the effluent within the safe range of 10-13 mg / L, which corresponds to the need to control the nitrate nitrogen in the biofilter effluent within the range of 10-12 mg / L.

[0117] The calculation interval is set to 2 minutes, and the methanol flow error value is 10 L / h. The detection interval of the influent nitrate nitrogen value is set to 15 minutes, and the detection interval of the effluent nitrate nitrogen value is set to 15 minutes. The set target value of the effluent nitrate nitrogen is 10 mg / L, the influent dissolved oxygen value is set to 6.5 mg / L, and the concentration of nitrite nitrogen in the influent is 0 mg / L due to the absence of nitrite nitrogen accumulation. The concentration of the carbon source methanol is 99%, and the density of the carbon source methanol is 0.79 kg / m 3 The theoretical mass of carbon source required to remove unit mass of nitrate nitrogen in water is 2.47 mg CH3OH / mg The theoretical mass of carbon source required to remove unit mass of nitrite nitrogen in water is 1.51 mg CH3OH / mg The theoretical mass of carbon source required to remove unit mass of dissolved oxygen in water is 0.87 mg CH3OH / mg O2.

[0118] The front-end and back-end optimization feedback mode is adopted, K1 and K2 are assigned values of 1-10, and K3 is assigned a value of 0. The methanol concentration is mainly considered in terms of the influent and effluent nitrate nitrogen concentrations.

[0119] The simulation is calculated every 2 minutes after setting, and the actual dosing flow is compared with the simulation value. If the error is within the range, no further adjustment is needed. If the error exceeds the range, the PID re-adjusts the frequency of the dosing pump to match the simulation flow, thereby achieving dynamic adjustment of the methanol dosing.

[0120] After two weeks of operation adjustment, the effluent water quality interval is smaller and the operation is more stable compared with manual adjustment under similar influent water quality conditions. The detection values of the daily average mixed sample of the effluent are compared. The total nitrogen range of the effluent of the manual adjustment is 9.8-12.4 mg / L; the total nitrogen range of the effluent of the automatic dosing system is 11.4-12.6 mg / L. The change range of the total nitrogen of the effluent of the manual dosing system is 2.6 mg / L, the change range of the total nitrogen of the effluent of the automatic dosing system is 1.2 mg / L, and the change range of the automatic dosing system is 53.8% smaller than that of the manual adjustment. Under the conditions of similar treatment water quantity and influent water quality, the daily average drug dosage of the manual dosing is 2.63 t, and the daily average drug dosage of the automatic dosing is 2.27 t. The automatic dosing system saves about 13.7% of the daily average drug dosage compared with the manual adjustment.

[0121] Example 2

[0122] Figure 3 A schematic diagram of a carbon source dosing dynamic adjustment device according to an embodiment of the application is shown.

[0123] As shown in Figure 3 , the carbon source dosing dynamic adjustment device comprises:

[0124] an influent flow meter 1 arranged on an influent passage;

[0125] an influent nitrate nitrogen concentration meter 3 and an effluent nitrate nitrogen concentration meter 7 arranged on the influent passage and the effluent passage respectively;

[0126] The influent flow meter 1, the influent nitrate nitrogen concentration meter 3 and the effluent nitrate nitrogen concentration meter 7 are used for real-time monitoring and calculation of data.

[0127] a deep treatment unit structure 2 for treating sewage;

[0128] a carbon source dosing pump 5 connected to a carbon source storage tank 6 and the deep treatment unit structure 2, for dosing the carbon source in the carbon source storage tank 6 into the deep treatment unit structure 2;

[0129] a carbon source dosing flow meter 4 connected to the carbon source dosing pump 5, for measuring the carbon source dosing flow;

[0130] a carbon source dosing automatic control system terminal 8 in communication connection with the influent flow meter 1, the influent nitrate nitrogen concentration meter 3, the effluent nitrate nitrogen concentration meter 7 and the carbon source dosing pump 5, to realize the following steps:

[0131] setting a time interval;

[0132] calculating the volume dosing concentration of the carbon source according to the calculation data every time the time interval is reached;

[0133] According to the volume dosing concentration of the carbon source, the carbon source dosing flow rate is calculated;

[0134] The carbon source dosing flow rate is taken as the target value, the frequency of the carbon source dosing pump 5 is adjusted through the PID control of the carbon source dosing pump 5, the target value is coupled and matched, and dynamic adjustment is realized.

[0135] In one example, the calculation data includes the concentration of nitrate nitrogen in the influent, the concentration of nitrate nitrogen in the effluent, the concentration of nitrite nitrogen in the influent, the concentration of dissolved oxygen in the influent, the average concentration of recent influent nitrate nitrogen, the influent flow rate, the reagent concentration of the carbon source, and the reagent density of the carbon source.

[0136] In one example, the volume dosing concentration of the carbon source is calculated by formula (1):

[0137] C 药 =C 进 -C 设 )+P2·C 亚硝进 +P3·C DO +K2·P1(C 出 -C 设 )+K3·P1(C 平均 -C 设 ) (1)

[0138] Wherein, C 药 is the volume dosing concentration of the carbon source, C 进 is the concentration of nitrate nitrogen in the influent, C 出 is the concentration of nitrate nitrogen in the effluent, C 设 is the set target concentration of effluent nitrate nitrogen, C 亚硝进 is the concentration of nitrite nitrogen in the influent, C DO is the concentration of dissolved oxygen in the influent, C 平均 is the average concentration of recent influent nitrate nitrogen, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of influent nitrate nitrogen, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of effluent nitrate nitrogen, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of recent influent nitrate nitrogen, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, and P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water.

[0139] In one example, the value range of K1, K2 and K3 is 0-10.

[0140] In one example, if the value range of K1 is 1-10, K2 and K3 are assigned as 0, and the influencing factors of the carbon source dosing flow rate include the concentration of influent nitrate nitrogen, the concentration of influent nitrite nitrogen, and the concentration of influent dissolved oxygen.

[0141] If the value range of K1 and K2 is 1-10, the value of K3 is 0, the influencing factors of the carbon source addition flow rate include the influent and effluent nitrate nitrogen concentrations;

[0142] If the value of K1 is 0, the value range of K2 and K3 is 1-10, the influencing factors of the carbon source addition flow rate include the effluent nitrate nitrogen concentration and the average value of the recent influent nitrate nitrogen concentration;

[0143] If the values of K1 and K2 are 0, the value range of K3 is 1-10, the influencing factors of the carbon source addition flow rate include the average value of the recent influent nitrate nitrogen concentration.

[0144] In one example, the carbon source addition flow rate is calculated by formula (2):

[0145] Q 药 = Q 进水 × C 药 × ω 药 × ρ 药 (2)

[0146] Wherein, Q 药 is the carbon source addition flow rate, Q 进水 is the influent flow rate, C 药 is the volume addition concentration of the carbon source, ω 药 is the reagent concentration of the carbon source, and ρ 药 is the reagent density of the carbon source.

[0147] In one example, it further includes:

[0148] Monitoring the influent COD value to prevent the sudden increase of the influent carbon source caused by the high COD concentration of the incoming water, which affects the calculation of the carbon source addition flow rate.

[0149] Example 3

[0150] The present disclosure provides an electronic device including a memory storing executable instructions, and a processor running the executable instructions in the memory to implement the above-mentioned carbon source addition dynamic adjustment method.

[0151] The electronic device according to the embodiments of the present disclosure includes a memory and a processor.

[0152] The memory is configured to store non-transitory computer readable instructions. Specifically, the memory can include one or more computer program products that can include various forms of computer readable storage media, such as volatile and / or non-volatile memory. The volatile memory, for example, can include random access memory (RAM), and / or a cache, and / or the like. The non-volatile memory, for example, can include read-only memory (ROM), hard disk, flash memory, and / or the like.

[0153] The processor can be a central processing unit (CPU) or other form of processing unit that has data processing and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions. In one embodiment of the present disclosure, the processor is configured to execute the computer readable instructions stored in the memory.

[0154] Those skilled in the art will understand that, in order to solve the technical problem of how to obtain a good user experience effect, the embodiment can also include well-known structures such as a communication bus, an interface, and the like, which should also be included in the protection scope of the present disclosure.

[0155] Detailed descriptions of the embodiments can refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0156] Example 4

[0157] The computer readable storage medium of the embodiments of the present disclosure stores a computer program, and the computer program is executed by a processor to implement the carbon source dynamic adjustment method.

[0158] The computer readable storage medium of the embodiments of the present disclosure stores a computer program, and the computer program is executed by a processor to implement the carbon source dynamic adjustment method.

[0159] The computer readable storage medium described above includes, but is not limited to, optical storage media (for example, CD-ROM and DVD), magneto-optical storage media (for example, MO), magnetic storage media (for example, magnetic tape or mobile hard disk), media with built-in rewritable non-volatile memory (for example, memory card), and media with built-in ROM (for example, ROM cartridge).

[0160] Those skilled in the art will understand that the purpose of the above description of the embodiments of the present disclosure is only to exemplarily illustrate the beneficial effects of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure to any examples given.

[0161] Having described various embodiments of the application, it is to be understood that the above description is meant to be illustrative only, and that many modifications and variations of the embodiments are possible without departing from the scope and spirit of the described embodiments. Many modifications and variations of the described embodiments are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the described embodiments can be practiced otherwise than as specifically described.

Claims

1. A carbon source dosing dynamic adjustment method, characterized in that, Comprising: Real-time monitoring calculation data, setting time interval; Every time the time interval is reached, the volume of carbon source is calculated. According to the volume of carbon source, the carbon source flow rate is calculated. The carbon source flow rate is used as the target value, and the frequency of the dosing pump is adjusted through PID control to match the target value and achieve dynamic adjustment. Wherein, the volume of carbon source is calculated by formula (1): C 药 = K1 P1(C 进 -C 设 ) + P2 C 亚硝进 + P3 C DO + K2 P1(C 出 -C 设 ) + K3 P1(C 平均 -C 设 ) (1) wherein C 药 is the volume dosing concentration of the carbon source, C 进 is the concentration of nitrate nitrogen in the influent, C 出 is the concentration of nitrate nitrogen in the effluent, C 设 is the set target concentration of nitrate nitrogen in the effluent, C 亚硝进 is the concentration of nitrite nitrogen in the influent, C DO is the concentration of dissolved oxygen in the influent, C 平均 is the average concentration of nitrate nitrogen in the recent influent, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the influent, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the effluent, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of nitrate nitrogen in the recent influent, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, and P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water. Wherein, if the value range of K1 is 1-10, K2 and K3 are assigned as 0, then the influencing factors of the carbon source flow rate include the influent nitrate nitrogen concentration. If the value range of K1 and K2 is 1-10, K3 is assigned as 0, then the influencing factors of the carbon source flow rate include the influent and effluent nitrate nitrogen concentration. If K1 is assigned as 0, the value range of K2 and K3 is 1-10, then the influencing factors of the carbon source flow rate include the effluent nitrate nitrogen concentration and the average value of recent influent nitrate nitrogen concentration. If K1 and K2 are assigned as 0, the value range of K3 is 1-10, then the influencing factors of the carbon source flow rate include the average value of recent influent nitrate nitrogen concentration.

2. The carbon source dosing dynamic adjustment method according to claim 1, wherein, The calculation data includes the concentration of nitrate nitrogen in the influent, the concentration of nitrate nitrogen in the effluent, the concentration of nitrite nitrogen in the influent, the concentration of dissolved oxygen in the influent, the average concentration of recent influent nitrate nitrogen, the influent flow rate, the concentration of carbon source, and the density of carbon source.

3. The method for dynamically adjusting carbon source dosage according to claim 1, wherein, The value range of K1, K2 and K3 is 0-10.

4. The method for dynamically adjusting carbon source dosage according to claim 1, wherein, The carbon source flow rate is calculated by formula (2): Q 药 = Q 进水 x C 药 x ω 药 x p 药 (2) wherein Q 药 is the carbon source addition flow rate, Q 进水 is the influent flow rate, C 药 is the volumetric dosing concentration of the carbon source, ω 药 is the medicament concentration of the carbon source, p 药 is the medicament density of the carbon source.

5. The method for dynamically adjusting carbon source dosage according to claim 1, wherein, Also comprising: Monitoring the influent COD value to prevent sudden increase of influent carbon source caused by high COD concentration of incoming water, which affects the calculation of carbon source flow rate.

6. A device for dynamically adjusting carbon source dosage, characterized in that, Comprising: Influent flow meter, set on the influent passage; Influent nitrate nitrogen concentration meter and effluent nitrate nitrogen concentration meter, respectively set on the influent passage and effluent passage; Wherein, the influent flow meter, the influent nitrate nitrogen concentration meter and the effluent nitrate nitrogen concentration meter are used for real-time monitoring calculation data; Advanced treatment unit structure, used for treating wastewater; Carbon source dosing pump, connected to the carbon source storage tank and the advanced treatment unit structure, used for adding carbon source in the carbon source storage tank to the advanced treatment unit structure; Carbon source flow rate meter, connected to the carbon source dosing pump, used for measuring carbon source flow rate; Carbon source dosing automatic control system terminal, respectively in communication connection with the influent flow meter, the influent nitrate nitrogen concentration meter, the effluent nitrate nitrogen concentration meter and the carbon source dosing pump, realizing the following steps: Setting time interval; Every time the time interval is reached, the volume of carbon source is calculated according to the calculation data; According to the volume of carbon source, the carbon source flow rate is calculated. The carbon source flow rate is used as the target value, and the frequency of the dosing pump is adjusted through PID control to match the target value and achieve dynamic adjustment. Wherein, the volume of carbon source is calculated by formula (1): C 药 = K1-P1(C 进 -C 设 ) + P2-C 亚硝进 + P3-C DO + K2-P1(C 出 -C 设 ) + K3-P1(C 平均 -C 设 ) (1) wherein C 药 is the volume dosing concentration of the carbon source, C 进 is the concentration of nitrate nitrogen in the influent, C 出 is the concentration of nitrate nitrogen in the effluent, C 设 is the set target concentration of nitrate nitrogen in the effluent, C 亚硝进 is the concentration of nitrite nitrogen in the influent, C DO is the concentration of dissolved oxygen in the influent, c 平均 is the average concentration of nitrate nitrogen in the recent influent, K1 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the influent, K2 is a correction coefficient for adjusting the carbon source dosing rate according to the concentration of nitrate nitrogen in the effluent, K3 is a correction coefficient for adjusting the carbon source dosing rate according to the average concentration of nitrate nitrogen in the recent influent, P1 is the theoretical mass of carbon source required for removing unit mass of nitrate nitrogen in water, P2 is the theoretical mass of carbon source required for removing unit mass of nitrite nitrogen in water, and P3 is the theoretical mass of carbon source required for removing unit mass of dissolved oxygen in water. Wherein, if the value range of K1 is 1-10, K2 and K3 are assigned as 0, then the influencing factors of the carbon source flow rate include the influent nitrate nitrogen concentration. If the value range of K1 and K2 is 1-10, K3 is assigned as 0, then the influencing factors of the carbon source flow rate include the influent and effluent nitrate nitrogen concentration. If K1 is assigned as 0, the value range of K2 and K3 is 1-10, then the influencing factors of the carbon source flow rate include the effluent nitrate nitrogen concentration and the average value of recent influent nitrate nitrogen concentration. If K1 and K2 are assigned as 0, the value range of K3 is 1-10, then the influencing factors of the carbon source flow rate include the average value of recent influent nitrate nitrogen concentration. If the assignment range of K1 and K2 is 1-10, and the assignment of K3 is 0, the influencing factors of the carbon source adding flow rate include the nitrate nitrogen concentration of the influent and effluent water; If the assignment of K1 is 0, and the assignment range of K2 and K3 is 1-10, the influencing factors of the carbon source adding flow rate include the nitrate nitrogen concentration of the effluent water and the average value of the recent influent nitrate nitrogen; If the assignment of K1 and K2 is 0, and the assignment range of K3 is 1-10, the influencing factors of the carbon source adding flow rate include the average value of the recent influent nitrate nitrogen concentration.

7. An electronic device, comprising: The electronic device comprises: a memory storing executable instructions; a processor running the executable instructions in the memory to implement the carbon source adding dynamic adjustment method in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, which is executed by the processor to implement the carbon source adding dynamic adjustment method in any one of claims 1-5.

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