CN112919599A - Chemical phosphorus removal and medicine adding control method and equipment - Google Patents

Chemical phosphorus removal and medicine adding control method and equipment Download PDF

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Publication number
CN112919599A
CN112919599A CN202010972508.3A CN202010972508A CN112919599A CN 112919599 A CN112919599 A CN 112919599A CN 202010972508 A CN202010972508 A CN 202010972508A CN 112919599 A CN112919599 A CN 112919599A
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deviation
calculating
phosphate concentration
dosing
difference
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张帅
周俊强
宋守洋
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Jinfeng Environmental Protection Co ltd
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Jinfeng Environmental Protection Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/18—PO4-P
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate

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  • Hydrology & Water Resources (AREA)
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  • Water Supply & Treatment (AREA)
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  • Inorganic Chemistry (AREA)
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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

Provides a control method and equipment for chemical phosphorus removal and dosing. The control method comprises the following steps: calculating a first dosage based on the inflow and the concentration of the phosphate in the inflow; calculating a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point; and controlling chemical phosphorus removal and dosing according to the first dosing amount and the second dosing amount. The invention adopts a chemical phosphorus removal means combining feed-forward of water inlet load and phosphate concentration feedback of water outlet, controls phosphorus removal and dosing by taking feed-forward of water inlet load as a main part and phosphate concentration feedback of water outlet as an auxiliary part, and can reduce the consumption of chemical phosphorus removal medicines, improve the utilization rate of the chemical phosphorus removal medicines and improve the lag property of the chemical phosphorus removal.

Description

Chemical phosphorus removal and medicine adding control method and equipment
Technical Field
The invention relates to a control method and equipment for chemical phosphorus removal and dosing, in particular to a control method and equipment for chemical phosphorus removal and dosing, which can realize low cost and improve the treatment effect of a phosphorus removal process.
Background
Automatic chemical dephosphorization dosing control is an important technical carrier for realizing intelligent dosing of intelligent sewage plants. By automatic control, metal salts are added into the sewage to form insoluble phosphate precipitation products, and then mud-water separation is carried out to remove the insoluble phosphate precipitation products from the effluent, thereby realizing chemical phosphorus removal. Therefore, automatic chemical phosphorus removal dosing control has become one of the main research hotspots of domestic and foreign water pollution control technology in recent years.
However, in the prior art, the control mode is single, so that the chemical phosphorus removal has obvious hysteresis and uncertainty, and the capability of resisting the impact of water quantity and water quality is poor. Therefore, a chemical phosphorus removal dosing control method and device capable of reducing the consumption of chemical phosphorus removal drugs, improving the utilization rate of the chemical phosphorus removal drugs and improving the hysteresis of the chemical phosphorus removal are needed.
Disclosure of Invention
The invention aims to provide a chemical phosphorus removal dosing control method and equipment which can realize low cost and improve the treatment effect of a phosphorus removal process.
According to an embodiment of the inventive concept, there is provided a control method of chemical phosphorus removal dosing, the control method including: calculating a first dosage based on the inflow and the concentration of the phosphate in the inflow; calculating a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point; and controlling chemical phosphorus removal and dosing according to the first dosing amount and the second dosing amount.
Optionally, the step of calculating the first dosing amount based on the influent water flow rate and the influent water phosphate concentration comprises: calculating a first deviation based on a difference between the influent phosphate concentration and a phosphate concentration setpoint; the first dosing amount is calculated based on a product of the inflow rate and the first deviation.
Optionally, the step of calculating the first deviation based on a difference between the influent phosphate concentration and the phosphate concentration setpoint comprises: a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor.
Optionally, the step of calculating the first dosage based on the product of the feed water flow and the first deviation comprises: calculating a first dosage based on a product of the influent flow rate, the first deviation and a first coefficient, wherein the first coefficient is associated with the sequencing batch test.
Optionally, the step of calculating the first dosage based on the product of the feed water flow and the first deviation further comprises: and calculating a first coefficient by considering the excessive adding coefficient of the chemical phosphorus removal and the theoretical phosphorus removal quality of the adding amount.
Alternatively, the overdosing factor for chemical phosphorus removal is determined by a sequencing batch test.
Optionally, the control method further includes: calculating a second deviation based on a difference between the effluent phosphate concentration and a phosphate concentration set point; calculating a second dosing amount as 0 when the second deviation is less than a threshold, wherein the second dosing amount is calculated based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point when the second deviation is greater than or equal to the threshold.
Optionally, when the second deviation is greater than or equal to the threshold, the step of calculating a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point comprises: determining a change in the second deviation over time; a second dosage amount is calculated based on a change in the second deviation over time using a proportional-integral-derivative control algorithm.
Optionally, the step of calculating a second dosage amount based on a change in the second deviation over time using a proportional-integral-derivative control algorithm comprises: calculating the product of the first difference and the scaling coefficient as a scaling term; calculating the product of the second deviation of the current moment and the integral coefficient as an integral term; calculating a product of a difference between the first difference and the second difference and a differential coefficient as a differential term; and calculating a second dosage based on the sum of the proportional term, the integral term and the differential term, wherein the first difference is the difference between the second deviation of the current time and the second deviation of the first previous time, and the second difference is the difference between the second deviation of the first previous time and the second deviation of the second previous time.
Optionally, the first previous time instant is a previous sample time instant of the current time instant, and the second previous time instant is a previous sample time instant of the first previous time instant.
Optionally, the step of calculating the second dosage based on the sum of the proportional term, the integral term and the differential term comprises: calculating a second dosage by taking the sum as a linear function of the independent variable.
According to an embodiment of the inventive concept, there is provided a control apparatus for chemical phosphorus removal dosing, the control apparatus including: a first dosing amount calculation module configured to calculate a first dosing amount based on the influent water flow rate and the influent water phosphate concentration; a second dosing amount calculation module configured to calculate a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point; and the control module is configured to control chemical phosphorus removal dosing according to the first dosing amount and the second dosing amount.
Optionally, the first medicated amount calculation module is configured to: calculating a first deviation based on a difference between the influent phosphate concentration and a phosphate concentration setpoint; the first dosing amount is calculated based on a product of the inflow rate and the first deviation.
Optionally, the first medicated amount calculation module is configured to: a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor.
Optionally, the first medicated amount calculation module is configured to: calculating a first dosage based on a product of the influent flow rate, the first deviation and a first coefficient, wherein the first coefficient is associated with the sequencing batch test.
Optionally, the first medicated amount calculation module is configured to: and calculating a first coefficient by considering the excessive adding coefficient of the chemical phosphorus removal and the theoretical phosphorus removal quality of the adding amount.
Alternatively, the overdosing factor for chemical phosphorus removal is determined by a sequencing batch test.
Optionally, the second medicated amount calculation module is further configured to: calculating a second deviation based on a difference between the effluent phosphate concentration and a phosphate concentration set point; calculating a second dosing amount as 0 when the second deviation is less than a threshold, wherein the second dosing amount calculation module is configured to calculate the second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point when the second deviation is greater than or equal to the threshold.
Optionally, the second medicated amount calculation module is configured to: determining a change in the second deviation over time; a second dosage amount is calculated based on a change in the second deviation over time using a proportional-integral-derivative control algorithm.
Optionally, the second medicated amount calculation module is configured to: calculating the product of the first difference and the scaling coefficient as a scaling term; calculating the product of the second deviation of the current moment and the integral coefficient as an integral term; calculating a product of a difference between the first difference and the second difference and a differential coefficient as a differential term; and calculating a second dosage based on the sum of the proportional term, the integral term and the differential term, wherein the first difference is the difference between the second deviation of the current time and the second deviation of the first previous time, and the second difference is the difference between the second deviation of the first previous time and the second deviation of the second previous time.
Optionally, the first previous time instant is a previous sample time instant of the current time instant, and the second previous time instant is a previous sample time instant of the first previous time instant.
Optionally, the second medicated amount calculation module is configured to: calculating a second dosage by taking the sum as a linear function of the independent variable.
According to an embodiment of the inventive concept, there is provided a computer readable storage medium having stored thereon a computer program, characterized in that when the computer program is executed by a processor, the method for controlling chemical phosphorus removal dosing as described above is implemented.
According to an embodiment of the inventive concept, there is provided a control apparatus including: a processor; and the memory stores a computer program which realizes the chemical phosphorus removal dosing control method when being executed by the processor.
The invention adopts a chemical phosphorus removal means combining feed-forward of water inlet load and phosphate concentration feedback of water outlet, controls phosphorus removal and dosing by taking feed-forward of water inlet load as a main part and phosphate concentration feedback of water outlet as an auxiliary part, and can reduce the consumption of chemical phosphorus removal medicines, improve the utilization rate of the chemical phosphorus removal medicines and improve the lag property of the chemical phosphorus removal.
Drawings
The above and/or other aspects of the present disclosure will become apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flowchart illustrating a control method of chemical phosphorus removal dosing according to an embodiment of the present inventive concept;
fig. 2 is a flowchart illustrating steps of calculating a first dosing amount according to an embodiment of the inventive concept;
fig. 3 is a flowchart illustrating steps of calculating a second dosing amount according to an embodiment of the inventive concept;
fig. 4 is a flowchart illustrating detailed steps of calculating a second medicine addition amount according to an embodiment of the inventive concept;
FIG. 5 is a block diagram illustrating a control apparatus for chemical phosphorus removal dosing according to an embodiment of the present inventive concept;
fig. 6 is a block diagram illustrating a control apparatus for chemical phosphorus removal dosing according to an embodiment of the inventive concept.
Detailed Description
Embodiments of the inventive concept will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a control method of chemical phosphorus removal dosing according to an embodiment of the inventive concept.
Referring to fig. 1, a chemical phosphorus removal dosing control method according to an embodiment of the inventive concept includes steps S1 to S3.
In step S1, a first dosage is calculated based on the influent water flow rate and the influent water phosphate concentration.
Step S1 can be represented by the following formula 1, wherein a1Represents the first dosage, the unit can be L/h, QInflow water(t) represents the inflow water flow at the time t, and the unit can be m3/h，CInflow water(t) represents the influent phosphate concentration at time t and may be in mg/L, f1(QInflow water(t)，CInflow water(t)) represents the first addition amount A1Is QInflow water(t) and CInflow water(t) as a function of.
A1(t)＝f1(QInflow water(t)，CInflow water(t)) formula 1
Specifically, the inflow water flow rate refers to the flow rate of the water to be treated before chemical phosphorus removal dosing, and the inflow water phosphate concentration refers to the phosphate concentration in the water to be treated before chemical phosphorus removal dosing. In the case where chemical phosphorus removal dosing is performed in a high-density tank in a water treatment system, the influent water flow rate and influent phosphate concentration represent the flow rate and phosphate concentration, respectively, of water to be treated prior to entering the high-density tank. However, the inventive concept is not so limited and chemical phosphorus removal dosing may also be performed in other tanks in the water treatment system.
For example, when the influent water flow rate is larger and/or the influent phosphate concentration is higher, the dosage needs to be increased accordingly. Thus, the dosing amount for chemical phosphorus removal is directly related to the feed water flow and the feed water phosphate concentration, and the first dosing amount calculated based on the feed water flow and the feed water phosphate concentration plays a major role in chemical phosphorus removal. Since the first dosage calculated in step S1 depends on relevant parameters of the water to be treated before chemical phosphorus removal, step S1 may also be referred to as a feed-forward step of the control method of chemical phosphorus removal dosing, the feed water flow rate and the feed water phosphate concentration may also be referred to as a feed-forward load, and the first dosage may also be referred to as a feed-forward dosage.
Hereinafter, the step of calculating the first medicine addition amount in step S1 will be described in detail with reference to fig. 2.
In step S2, a second dosage is calculated based on a change in the difference between the effluent phosphate concentration and the phosphate concentration set point.
Step S2 can be represented by the following formula 2, wherein a2(t) represents the second dosage at the time t, and the unit can be L/h, CDischarging water(t) represents the phosphate concentration of the effluent at time t, and the unit can be mg/L, CIs provided withRepresents a phosphate concentration setpoint and may be, for example, 0.3mg/L, Δ (C)Discharging water(t)-CIs provided with) Represents the phosphate concentration C of the effluent at time tDischarging water(t) and phosphate concentration setpoint CIs provided withChange in difference between f2(Δ(CDischarging water(t)-CIs provided with) ) represents the second dosage A2Is the phosphate concentration C of the effluent at time tDischarging water(t) and phosphate concentration setpoint CIs provided withChange of difference between delta (C)Discharging water(t)-CIs provided with) As a function of (c).
A2(t)＝f2(Δ(CDischarging water(t)-CIs provided with) Equation 2)
Specifically, the effluent phosphate concentration refers to the actual phosphate concentration of the chemical phosphorus removal medicated water. In the case where chemical phosphorus removal dosing is performed in a high-density basin in a water treatment system, the effluent phosphate concentration represents the actual phosphate concentration of the treated water flowing from the high-density basin. The phosphate concentration setpoint refers to the desired phosphate concentration of the chemical phosphorus removal medicated water.
In ideal or desired situations, the actual phosphate concentration of the chemical phosphorus removal medicated water should be equal to and/or less than the phosphate concentration set point. However, in practical cases, during the sampling interval when the corresponding instrument is used to measure the influent water flow and the influent water phosphate concentration, there may be some fluctuation in the influent water flow and the influent water phosphate concentration, and thus the actual phosphate concentration of the water after chemical phosphorus removal dosing treatment using the first dosing amount may be greater than the phosphate concentration set value, resulting in the phosphate concentration of the treated water exceeding the standard.
In this case, according to an embodiment of the inventive concept, the ability to chemically remove phosphorus can be increased by performing the above-described step S2 to calculate an additional addition amount (i.e., a second addition amount) to reduce the phosphate concentration of the effluent and to make the actual phosphate concentration of the treated water reach the standard (i.e., to reduce the phosphate concentration of the effluent to be equal to or less than the phosphate concentration set value). The second dosage calculated in step S2 therefore serves as an aid in chemical phosphorus removal. In addition, since the second dosage calculated in step S2 depends on the relevant parameters of the water after chemical phosphorus removal treatment using the first dosage, step S2 may also be referred to as a feedback step of the control method of chemical phosphorus removal dosing, the effluent phosphate concentration may also be referred to as a feedback load, and the second dosage may also be referred to as a feedback dosage. Because the concentration of the phosphate in the effluent is used as feedback, the consumption of chemical phosphorus removal medicines can be reduced, the utilization rate of the chemical phosphorus removal medicines can be improved, and the hysteresis quality of the chemical phosphorus removal can be improved.
In a preferred example, the chemical phosphorus removal dosing control method according to an embodiment of the inventive concept may further include steps S4 (not shown) and S5 (not shown).
In step S4, a second deviation is calculated based on the difference between the effluent phosphate concentration and the phosphate concentration set point.
Step S4 can be represented by the following formula 3, wherein D2(t) represents a second deviation at time t.
D2(t)＝CDischarging water(t)-CIs provided withEquation 3
In step S5, when the second deviation is smaller than the threshold value, the second medicine addition amount is calculated as 0. Further, when the second deviation is greater than or equal to the threshold value, step S2 may be performed to calculate a second medicine addition amount.
The second dosage amount can be calculated by the following equation 4, where CthRepresenting a threshold value. For example, threshold CthMay be equal to 0.1 mg/L.
Figure BDA0002684606330000061
Through the above steps S4 and S5, whether the second medicine adding amount is needed or not can be quickly judged by setting an appropriate threshold value, and the second medicine adding amount is made equal to 0 when the second medicine adding amount is not needed, so that the calculation resources are saved, and the calculation speed is increased.
Hereinafter, the step of calculating the second medicine addition amount in step S2 will be described in detail with reference to fig. 3 and 4.
In step S3, chemical phosphorus removal dosing is controlled based on the first dosing amount and the second dosing amount.
In one specific example, the sum of the first and second dosing amounts may be used as the final dosing amount, and the dosing pump is controlled to dose at the final dosing amount using the frequency converter based on a control signal corresponding to the final dosing amount. The final dosage can be calculated by the following equation 5, where a (t) represents the final dosage at time t, and the unit can be L/h.
A(t)＝A1(t)+A2(t) equation 5
According to the embodiment of the present inventive concept, in case of chemical phosphorus removal dosing using one high density tank, the dosing point may be set to one, and the final dosing amount is allocated to only one dosing point for chemical phosphorus removal dosing; alternatively, the dosing points may be set to a plurality of dosing points, a total first dosing amount may be assigned to chemical phosphorus removal dosing at least one of the plurality of dosing points and a total second dosing amount may be assigned to chemical phosphorus removal dosing at least one of the plurality of dosing points while maintaining the final dosing amount constant. In addition, under the condition that a plurality of high-density tanks are used for chemical phosphorus removal and dosing, the final dosing amount can be distributed to one high-density tank in the plurality of high-density tanks for chemical phosphorus removal and dosing; alternatively, a total first dosing amount may be distributed to at least one of the plurality of dense pools for chemical phosphorus removal dosing and a total second dosing amount may be distributed to at least one of the plurality of dense pools for chemical phosphorus removal dosing, while maintaining the final dosing amount constant. However, the inventive concept is not so limited and the application is not specifically limited as to how the first and second dosing amounts are dispensed to the high-density reservoir and/or the point of administration.
Fig. 2 is a flowchart illustrating steps of calculating a first medicine addition amount according to an embodiment of the inventive concept.
Referring to fig. 2, the step of calculating the first medicine addition amount according to an embodiment of the inventive concept includes steps S11 and S12.
In step S11, a first deviation is calculated based on a difference between the influent phosphate concentration and the phosphate concentration set point.
Step S11 can be represented by the following equation 6, where D1(t) represents a first deviation at time t, and symbol ∈ represents a positive correlation.
D1(t)∝CInflow water(t)-CIs provided withPublicFormula 6
According to an embodiment of the present inventive concept, step S11 may specifically include: a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor. That is, equation 6 may be specifically represented by equation 7 below, where C0Representing the effluent phosphate safety factor, dimensionless, and the effluent phosphate safety factor C0Can be determined according to the prior art.
D1(t)＝CInflow water(t)-CIs provided with+C0Equation 7
In step S12, a first medicine addition amount is calculated based on the product of the inflow rate and the first deviation.
Step S12 can be represented by the following equation 8.
A1(t)∝QInflow water(t)×D1(t) formula 8
Generally, both the inflow rate and the inflow phosphate concentration fluctuate with time, and the fluctuation of the inflow rate is often greater than the fluctuation of the inflow phosphate concentration, so that the inflow load can be calculated in real time according to the product of the inflow rate and the inflow phosphate concentration as shown in equation 8, thereby controlling the first dosage.
According to an embodiment of the present inventive concept, step S12 may specifically include: and calculating the first dosage based on the product of the inflow, the first deviation and the first coefficient. That is, equation 8 may be specifically represented by equation 9 below, where K represents a first coefficient and is associated with a sequencing batch test.
A1(t)＝QInflow water(t)×D1(t). times.K equation 9
In one example, the first coefficient K may be calculated by considering an overdose coefficient for chemical phosphorus removal and a theoretical phosphorus removal quality of the dose. The first coefficient K may be calculated by the following equation 10, where K1Represents the excessive addition coefficient of chemical phosphorus removal, the excessive addition coefficient can be the molar ratio of the addition of metal elements to phosphorus elements in the water to be treated and can be determined by a sequencing batch test, K2Indicating unit dosingThe theoretical phosphorus removal mass of an amount, which may be in g/L, may be determined by a sequencing batch test.
K∝K1/K2Equation 10
In one specific example, as shown in equation 11 below, the overdosing coefficient K can be determined by chemical phosphorus removal1Theoretical phosphorus removal mass K of medicine adding amount2And a feedforward coefficient, calculating a first coefficient K, wherein KFeed forwardRepresenting feed forward coefficients, dimensionless, and feed forward coefficients KFeed forwardCan be determined according to the prior art.
K＝KFeed forward×K1/K2Equation 11
Fig. 3 is a flowchart illustrating steps of calculating a second medicine addition amount according to an embodiment of the inventive concept.
Referring to fig. 3, the step of calculating the second medicine addition amount according to an embodiment of the inventive concept includes arrangements S21 and S22.
In step S21, a change in the second deviation with time is determined.
For example, the second deviation may be calculated according to equation 3, and the change in the second deviation with time may be determined based on a plurality of second deviations calculated at different time points.
In step S22, a second dosage amount is calculated based on a change in the second deviation with time using a proportional-integral-derivative (PID) control algorithm.
For example, the second dosage amount may be calculated according to equation 2. Hereinafter, the step of calculating the second medicine addition amount in step S22 will be described in detail with reference to fig. 4.
Fig. 4 is a flowchart illustrating detailed steps of calculating a second medicine addition amount according to an embodiment of the inventive concept.
Referring to fig. 4, step S22 according to an embodiment of the inventive concept includes steps S221 to S224.
In step S221, a product of the first difference and the scaling factor is calculated as a scaling term.
According to an embodiment of the inventive concept, the first difference may be a difference between the second deviation of the current time instant and the second deviation of the first previous time instant, and the first previous time instant may be a previous sampling time instant of the current time instant.
Therefore, step S221 may be represented by the following formula 12, wherein ap(t) represents a proportional term, KpDenotes the proportionality coefficient, D2(t) is the second deviation of the current time t, D2(t-1) represents a second deviation of the first previous instant, (D)2(t)-D2(t-1)) is the first difference.
Ap(t)＝Kp×(D2(t)-D2(t-1)) formula 12
In step S222, the product of the second deviation at the current time and the integral coefficient is calculated as the integral term.
Step S222 may be represented by the following formula 13, wherein ai(t) denotes the integral term, KiRepresenting the integral coefficient.
Ai(t)＝Ki×D2(t) formula 13
In step S223, the product of the difference between the first difference and the second difference and the differential coefficient d is calculated as a differential term.
According to an embodiment of the inventive concept, the second difference is a difference between a second deviation of the first previous time instant and a second deviation of the second previous time instant, and the second previous time instant is a previous sampling time instant of the first previous time instant.
Therefore, step S223 can be represented by the following formula 14, wherein ad(t) denotes a differential term, KdRepresenting a differential coefficient, D2(t-2) represents a second deviation of a second previous instant, (D)2(t-1) -D2t-2 is the second difference.
Ad(t)＝Kd×[(D2(t)-D2(t-1))-(D2(t-1)-D2(t-2))]Equation 14
The proportional coefficient, the integral coefficient, and the differential coefficient in the above steps S221 to S223 may be determined by an engineering trial and error method. For example, the sampling interval may be first determined based on the current effluent phosphate concentration, then the scaling factor may be optimized, and finally the integral and derivative factors may be determined.
In step S224, a second medicine addition amount is calculated based on the sum of the proportional term, the integral term, and the differential term.
Step S224 may be represented by the following equation 15, where S (t) represents the sum of the proportional term, the integral term, and the differential term.
A2(t)∝S(t)＝Ap(t)+Ai(t)+Ad(t) formula 15
In one specific example, the second dosage amount is calculated by taking the sum as a linear function of the independent variable. Therefore, equation 15 may be specifically represented by equation 16 below, where a and b are coefficients of linear functions, respectively, and are dimensionless, and a and b may be determined according to the prior art, respectively. Further, the coefficient a of the linear function may also be referred to as a feedback coefficient.
A2(t) ═ a × s (t) + b equation 16
Therefore, according to the above formulas 1 to 16, the final dosing amount can be calculated, so that chemical phosphorus removal dosing can be performed according to the final dosing amount.
Fig. 5 is a block diagram illustrating a control apparatus for chemical phosphorus removal dosing according to an embodiment of the inventive concept.
Referring to fig. 5, the control apparatus 100 for chemical phosphorus removal dosing according to an embodiment of the inventive concept includes a first dosing amount calculation module 110, a second dosing amount module 120, and a control module 130.
The first dosing amount calculation module 110 is configured to calculate a first dosing amount based on the influent water flow rate and the influent water phosphate concentration. For example, the first medicated amount calculation module 110 may calculate according to equation 1.
Specifically, the inflow water flow rate refers to the flow rate of the water to be treated before chemical phosphorus removal dosing, and the inflow water phosphate concentration refers to the phosphate concentration in the water to be treated before chemical phosphorus removal dosing. In the case where chemical phosphorus removal dosing is performed in a high-density tank in a water treatment system, the influent water flow rate and influent phosphate concentration represent the flow rate and phosphate concentration, respectively, of water to be treated prior to entering the high-density tank. However, the inventive concept is not so limited and chemical phosphorus removal dosing may also be performed in other tanks in the water treatment system.
For example, when the influent water flow rate is larger and/or the influent phosphate concentration is higher, the dosage needs to be increased accordingly. Thus, the dosing amount for chemical phosphorus removal is directly related to the feed water flow and the feed water phosphate concentration, and the first dosing amount calculated based on the feed water flow and the feed water phosphate concentration plays a major role in chemical phosphorus removal. Since the first addition amount calculated in the above process of the first addition amount calculation module 110 depends on relevant parameters of the water to be treated before chemical phosphorus removal, the above process of the first addition amount calculation module 110 may also be referred to as a feed-forward process of the chemical phosphorus removal dosing control apparatus, the feed-water flow rate and the feed-water phosphate concentration may also be referred to as a feed-forward load, and the first addition amount may also be referred to as a feed-forward addition amount.
Hereinafter, the process of the first dosage amount calculation module 110 calculating the first dosage amount will be described in detail.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: a first deviation is calculated based on a difference between the influent phosphate concentration and the phosphate concentration set point. For example, the first medicated amount calculation module 110 may calculate according to equation 6.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor. For example, the first medicated amount calculation module 110 may calculate according to equation 7.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: the first dosing amount is calculated based on a product of the inflow rate and the first deviation. For example, the first medicated amount calculation module 110 may calculate according to equation 8.
Generally, both the inflow rate and the inflow phosphate concentration fluctuate with time, and the fluctuation of the inflow rate is often greater than the fluctuation of the inflow phosphate concentration, so that the inflow load can be calculated in real time according to the product of the inflow rate and the inflow phosphate concentration as shown in equation 8, thereby controlling the first dosage.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: and calculating the first dosage based on the product of the inflow, the first deviation and the first coefficient. For example, the first medicated amount calculation module 110 may calculate according to equation 9.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: and calculating a first coefficient K by considering the excessive adding coefficient of the chemical phosphorus removal and the theoretical phosphorus removal quality of the adding amount. . For example, the first medicated amount calculation module 110 may calculate according to equation 10.
According to an embodiment of the inventive concept, the first medicated amount calculation module 110 may be configured to: excess addition coefficient K by chemical phosphorus removal1Theoretical phosphorus removal mass K of medicine adding amount2And a feedforward coefficient calculating the first coefficient K. For example, the first medicated amount calculation module 110 may calculate according to equation 11.
The second dosing amount calculation module 120 is configured to calculate a second dosing amount based on a change in a difference between the effluent phosphate concentration and the phosphate concentration set point. For example, the second medicated amount calculation module 120 may calculate according to equation 2.
Specifically, the effluent phosphate concentration refers to the actual phosphate concentration of the chemical phosphorus removal medicated water. In the case where chemical phosphorus removal dosing is performed in a high-density basin in a water treatment system, the effluent phosphate concentration represents the actual phosphate concentration of the treated water flowing from the high-density basin. The phosphate concentration setpoint refers to the desired phosphate concentration of the chemical phosphorus removal medicated water.
In ideal or desired situations, the actual phosphate concentration of the chemical phosphorus removal medicated water should be equal to and/or less than the phosphate concentration set point. However, in practical cases, during the sampling interval when the corresponding instrument is used to measure the influent water flow and the influent water phosphate concentration, there may be some fluctuation in the influent water flow and the influent water phosphate concentration, and thus the actual phosphate concentration of the water after chemical phosphorus removal dosing treatment using the first dosing amount may be greater than the phosphate concentration set value, resulting in the phosphate concentration of the treated water exceeding the standard.
In this case, according to an embodiment of the inventive concept, the second dosing amount calculation module 120 may increase the ability to chemically remove phosphorus by calculating an additional dosing amount (i.e., a second dosing amount) by performing the above-described process, thereby decreasing the effluent phosphate concentration and bringing the actual phosphate concentration of the treated water to the standard (i.e., decreasing the effluent phosphate concentration to be equal to or less than the phosphate concentration set point). The second dosage calculated in the above process therefore plays an auxiliary role in chemical phosphorus removal. Further, since the second addition amount calculated in the above process depends on the relevant parameters of the water after the chemical phosphorus removal treatment using the first addition amount, the above process may also be referred to as a feedback process of the chemical phosphorus removal dosing control apparatus, the effluent phosphate concentration may also be referred to as a feedback load, and the second addition amount may also be referred to as a feedback addition amount. Because the concentration of the phosphate in the effluent is used as feedback, the consumption of chemical phosphorus removal medicines can be reduced, the utilization rate of the chemical phosphorus removal medicines can be improved, and the hysteresis quality of the chemical phosphorus removal can be improved.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be further configured to: a second deviation is calculated based on a difference between the effluent phosphate concentration and the phosphate concentration set point. For example, the second medicated amount calculation module 120 may calculate according to equation 3.
According to an embodiment of the inventive concept, the second dosing amount calculation module 120 may be further configured to calculate the second dosing amount as 0 when the second deviation is less than the threshold. Further, according to an embodiment of the inventive concept, when the second deviation is greater than or equal to the threshold, the second dosing amount calculation module 120 may be configured to calculate the second dosing amount based on a change in a difference between the effluent phosphate concentration and the phosphate concentration set point. For example, the second medicated amount calculation module 120 may calculate according to equation 4.
Through the processing, whether the second dosing amount is needed or not can be quickly judged by setting a proper threshold value, and the second dosing amount is equal to 0 when the second dosing amount is not needed, so that the calculation resources are saved, and the calculation speed is increased.
Hereinafter, the process of calculating the second medicine addition amount by the second medicine addition amount calculation module 120 will be described in detail.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: a change in the second deviation over time is determined. For example, the second medicated amount calculation module 120 may calculate according to equation 3.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: a second dosage amount is calculated based on a change in the second deviation over time using a PID control algorithm. For example, the second dosage amount calculation module 120 can calculate the second dosage amount according to equation 2.
Hereinafter, a process in which the second medicine addition amount calculation module 120 calculates the second medicine addition amount based on the change over time of the second deviation using the PID control algorithm will be described in detail.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: the product of the first difference and the scaling factor is calculated as the scaling term. According to an embodiment of the inventive concept, the first difference may be a difference between the second deviation of the current time instant and the second deviation of the first previous time instant, and the first previous time instant may be a previous sampling time instant of the current time instant. For example, the second medicated amount calculation module 120 may calculate according to equation 12.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: and calculating the product of the second deviation and the integral coefficient at the current moment as an integral term. For example, the second dosing amount calculation module 120 may calculate according to equation 13.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: the product of the difference between the first difference and the second difference and the differential coefficient d is calculated as a differential term. According to an embodiment of the inventive concept, the second difference is a difference between a second deviation of the first previous time instant and a second deviation of the second previous time instant, and the second previous time instant is a previous sampling time instant of the first previous time instant. For example, the second medicated amount calculation module 120 may calculate according to equation 14.
The proportional coefficient, the integral coefficient and the differential coefficient in the above processes can be determined by an engineering trial and error method. For example, the sampling interval may be first determined based on the current effluent phosphate concentration, then the scaling factor may be optimized, and finally the integral and derivative factors may be determined.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: and calculating the second dosage based on the sum of the proportional term, the integral term and the differential term. For example, the second dosing amount calculation module 120 may calculate according to equation 15.
According to an embodiment of the inventive concept, the second medicated amount calculation module 120 may be configured to: calculating a second dosage by taking the sum as a linear function of the independent variable. For example, the second medicated amount calculation module 120 may calculate according to equation 16.
The control module 130 is configured to: and controlling chemical phosphorus removal and dosing according to the first dosing amount and the second dosing amount.
In one specific example, the sum of the first and second dosing amounts may be used as the final dosing amount, and the dosing pump is controlled to dose at the final dosing amount using the frequency converter based on a control signal corresponding to the final dosing amount. For example, the control module 130 may perform the calculation according to equation 5 above.
In one particular example, where one high density tank is used for chemical phosphorus removal dosing, the dosing point may be set to one and the final dosing amount assigned to only one dosing point for chemical phosphorus removal dosing; alternatively, the dosing points may be set to a plurality of dosing points, a total first dosing amount may be assigned to chemical phosphorus removal dosing at least one of the plurality of dosing points and a total second dosing amount may be assigned to chemical phosphorus removal dosing at least one of the plurality of dosing points while maintaining the final dosing amount constant. In addition, under the condition that a plurality of high-density tanks are used for chemical phosphorus removal and dosing, the final dosing amount can be distributed to one high-density tank in the plurality of high-density tanks for chemical phosphorus removal and dosing; alternatively, a total first dosing amount may be distributed to at least one of the plurality of dense pools for chemical phosphorus removal dosing and a total second dosing amount may be distributed to at least one of the plurality of dense pools for chemical phosphorus removal dosing, while maintaining the final dosing amount constant. However, the inventive concept is not so limited and the application is not specifically limited as to how the first and second dosing amounts are dispensed to the high-density reservoir and/or the point of administration.
Fig. 6 is a block diagram illustrating a control apparatus for chemical phosphorus removal dosing according to an embodiment of the inventive concept.
Referring to fig. 6, the control device 200 for chemical phosphorus removal dosing according to an embodiment of the present disclosure may be (but is not limited to) a PLC industrial personal computer. The chemical phosphorus removal dosing control device 200 according to embodiments of the present disclosure may include a processor 210 and a memory 220. The processor 210 may include, but is not limited to, a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a microcomputer, a Field Programmable Gate Array (FPGA), a system on a chip (SoC), a microprocessor, an Application Specific Integrated Circuit (ASIC), and the like. The memory 720 stores computer programs to be executed by the processor 210. Memory 220 includes high speed random access memory and/or non-volatile computer-readable storage media. The control method of chemical phosphorus removal dosing as described above may be implemented when the processor 210 executes a computer program stored in the memory 220.
Alternatively, the control device 200 may communicate with other components in the water treatment system in a wired/wireless communication manner, and may also communicate with other devices in the water treatment system in a wired/wireless communication manner. Further, the control device 200 may communicate with a device external to the water treatment system in a wired/wireless communication manner. Further, the control device 200 may have a timer and an encoder function.
The control method of chemical phosphorus removal dosing according to embodiments of the present disclosure may be written as a computer program and stored on a computer readable storage medium. When the computer program is executed by a processor, the control method for chemical phosphorus removal dosing as described above can be realized. Examples of computer-readable storage media include: read-only memory (ROM), random-access programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), random-access memory (RAM), dynamic random-access memory (DRAM), static random-access memory (SRAM), flash memory, non-volatile memory, CD-ROM, CD-R, CD + R, CD-RW, CD + RW, DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD + RW, DVD-RAM, BD-ROM, BD-R, BD-R LTH, BD-RE, Blu-ray or compact disc memory, Hard Disk Drive (HDD), solid-state drive (SSD), card-type memory (such as a multimedia card, a Secure Digital (SD) card or a extreme digital (XD) card), magnetic tape, a floppy disk, a magneto-optical data storage device, an optical data storage device, a hard disk, a magnetic tape, a magneto-optical data storage device, a, A solid state disk, and any other device configured to store and provide a computer program and any associated data, data files, and data structures to a processor or computer in a non-transitory manner such that the processor or computer can execute the computer program. In one example, the computer program and any associated data, data files, and data structures are distributed across networked computer systems such that the computer program and any associated data, data files, and data structures are stored, accessed, and executed in a distributed fashion by one or more processors or computers.
The invention adopts a chemical phosphorus removal means combining feed-forward of water inlet load and phosphate concentration feedback of water outlet, controls phosphorus removal and dosing by taking feed-forward of water inlet load as a main part and phosphate concentration feedback of water outlet as an auxiliary part, and can reduce the consumption of chemical phosphorus removal medicines, improve the utilization rate of the chemical phosphorus removal medicines and improve the lag property of the chemical phosphorus removal.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims (24)

1. A control method for chemical phosphorus removal dosing comprises the following steps:
calculating a first dosage based on the inflow and the concentration of the phosphate in the inflow;
calculating a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point;
and controlling chemical phosphorus removal and dosing according to the first dosing amount and the second dosing amount.
2. The control method of claim 1, wherein the step of calculating the first dosage based on the influent water flow rate and the influent water phosphate concentration comprises:
calculating a first deviation based on a difference between the influent phosphate concentration and a phosphate concentration setpoint;
the first dosing amount is calculated based on a product of the inflow rate and the first deviation.
3. The control method of claim 2, wherein calculating the first deviation based on the difference between the influent phosphate concentration and the phosphate concentration setpoint comprises:
a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor.
4. The control method of claim 2, wherein the step of calculating the first dosage based on the product of the influent water flow and the first deviation comprises:
calculating a first dosage based on the product of the inflow, the first deviation and the first coefficient,
wherein the first coefficient is associated with a sequencing batch test.
5. The control method of claim 4, wherein the step of calculating the first dosage based on the product of the influent water flow and the first deviation further comprises:
and calculating a first coefficient by considering the excessive adding coefficient of the chemical phosphorus removal and the theoretical phosphorus removal quality of the adding amount.
6. The control method of claim 5, wherein the overdose factor for chemical phosphorus removal is determined by a sequencing batch test.
7. The control method according to claim 1, characterized by further comprising:
calculating a second deviation based on a difference between the effluent phosphate concentration and a phosphate concentration set point;
calculating a second dosage as 0 when the second deviation is less than the threshold,
wherein the second dosing amount is calculated based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point when the second deviation is greater than or equal to the threshold.
8. The control method of claim 7, wherein when the second deviation is greater than or equal to the threshold, the step of calculating the second dosing amount based on a change in the difference between the effluent phosphate concentration and the phosphate concentration set point comprises:
determining a change in the second deviation over time;
a second dosage amount is calculated based on a change in the second deviation over time using a proportional-integral-derivative control algorithm.
9. The control method of claim 8, wherein the step of calculating the second dosage based on the change in the second deviation over time using a proportional-integral-derivative control algorithm comprises:
calculating the product of the first difference and the scaling coefficient as a scaling term;
calculating the product of the second deviation of the current moment and the integral coefficient as an integral term;
calculating a product of a difference between the first difference and the second difference and a differential coefficient as a differential term;
calculating the second dosage based on the sum of the proportional term, the integral term and the differential term,
wherein the first difference is a difference between a second deviation at the current time and a second deviation at a first previous time, and the second difference is a difference between the second deviation at the first previous time and a second deviation at a second previous time.
10. The control method of claim 9, wherein the first previous time is a previous sample time to the current time, and the second previous time is a previous sample time to the first previous time.
11. The control method of claim 9, wherein the step of calculating the second dosing amount based on the sum of the proportional term, the integral term, and the derivative term comprises:
calculating a second dosage by taking the sum as a linear function of the independent variable.
12. A control apparatus for chemical phosphorus removal dosing, the control apparatus comprising:
a first dosing amount calculation module configured to calculate a first dosing amount based on the influent water flow rate and the influent water phosphate concentration;
a second dosing amount calculation module configured to calculate a second dosing amount based on a change in a difference between the effluent phosphate concentration and a phosphate concentration set point;
and the control module is configured to control chemical phosphorus removal dosing according to the first dosing amount and the second dosing amount.
13. The control apparatus of claim 12, wherein the first medicated amount calculation module is configured to:
calculating a first deviation based on a difference between the influent phosphate concentration and a phosphate concentration setpoint;
the first dosing amount is calculated based on a product of the inflow rate and the first deviation.
14. The control apparatus of claim 13, wherein the first medicated amount calculation module is configured to:
a first deviation is calculated based on the sum of the difference between the influent phosphate concentration and the phosphate concentration set point and the effluent phosphate safety factor.
15. The control apparatus of claim 13, wherein the first medicated amount calculation module is configured to:
calculating a first dosage based on the product of the inflow, the first deviation and the first coefficient,
wherein the first coefficient is associated with a sequencing batch test.
16. The control apparatus of claim 15, wherein the first medicated amount calculation module is configured to:
and calculating a first coefficient by considering the excessive adding coefficient of the chemical phosphorus removal and the theoretical phosphorus removal quality of the adding amount.
17. The control apparatus of claim 16, wherein the overdose factor for chemical phosphorus removal is determined by a sequencing batch test.
18. The control apparatus of claim 12, wherein the second medicated amount calculation module is further configured to:
calculating a second deviation based on a difference between the effluent phosphate concentration and a phosphate concentration set point;
calculating a second dosage as 0 when the second deviation is less than the threshold,
wherein the second dosing amount calculation module is configured to calculate a second dosing amount based on a change in a difference between the effluent phosphate concentration and the phosphate concentration set point when the second deviation is greater than or equal to the threshold.
19. The control apparatus of claim 18, wherein the second medicated amount calculation module is configured to:
determining a change in the second deviation over time;
a second dosage amount is calculated based on a change in the second deviation over time using a proportional-integral-derivative control algorithm.
20. The control apparatus of claim 19, wherein the second medicated amount calculation module is configured to:
calculating the product of the first difference and the scaling coefficient as a scaling term;
calculating the product of the second deviation of the current moment and the integral coefficient as an integral term;
calculating a product of a difference between the first difference and the second difference and a differential coefficient as a differential term;
calculating the second dosage based on the sum of the proportional term, the integral term and the differential term,
wherein the first difference is a difference between a second deviation at the current time and a second deviation at a first previous time, and the second difference is a difference between the second deviation at the first previous time and a second deviation at a second previous time.
21. The control apparatus of claim 20, wherein the first previous time is a previous sample time prior to the current time, and the second previous time is a previous sample time prior to the first previous time.
22. The control apparatus of claim 20, wherein the second medicated amount calculation module is configured to:
calculating a second dosage by taking the sum as a linear function of the independent variable.
23. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method of chemical phosphorus removal dosing control of any one of claims 1 to 11.
24. A control device, comprising:
a processor;
a memory storing a computer program which, when executed by the processor, implements the chemical phosphorus removal dosing control method of any one of claims 1 to 11.
CN202010972508.3A 2020-09-16 2020-09-16 Chemical phosphorus removal and medicine adding control method and equipment Pending CN112919599A (en)

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