CN115215436A - Intelligent dosing dephosphorization control system and control method based on synchronous dephosphorization - Google Patents
Intelligent dosing dephosphorization control system and control method based on synchronous dephosphorization Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 25
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 176
- 239000011574 phosphorus Substances 0.000 claims abstract description 176
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 175
- 239000003814 drug Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000010802 sludge Substances 0.000 claims abstract description 44
- 238000010992 reflux Methods 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims abstract description 8
- 230000003993 interaction Effects 0.000 claims abstract description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 46
- 238000004062 sedimentation Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 14
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides an intelligent dosing dephosphorization control system and method based on synchronous dephosphorization, comprising the following steps: the system comprises a data acquisition unit, a control unit and a dosing cloud processor; the data acquisition unit respectively acquires relevant parameters of water inlet and outlet of the biochemical system and transmits the parameters to the control unit; the control unit is in information interaction with the dosing cloud processor; the dosing cloud processor calls a medicament dosing model according to the received information, calculates the real-time medicament dosing amount and transmits the real-time medicament dosing amount to the control unit, and the control unit transmits a corresponding instruction to the dosing pump to accurately dose the medicament; the dosing cloud processor evaluates the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time according to the received information, and if the evaluation result is lower than a set value, the intelligent dosing cloud processor sends an instruction for reducing the external reflux ratio to the residual sludge pump through the control unit, and simultaneously adjusts an instruction for increasing the dosing flow to the dosing pump, so that the frequency of the dosing pump is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is performed.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an intelligent dosing and phosphorus removal control system and method based on synchronous phosphorus removal.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the standard of the pollutant emissions of sewage plants is higher and higher, and Total Phosphorus (TP) becomes the key point of supervision in each index. Therefore, on the basis of the existing biological phosphorus removal, a chemical phosphorus removal working section needs to be added to ensure that the total phosphorus of the effluent reaches the standard. The chemical phosphorus removal can be divided into pre-phosphorus removal, synchronous phosphorus removal and post-phosphorus removal according to the classification of the phosphorus removal agent adding points. And most sewage plants have low water inlet load and are not provided with a primary sedimentation tank, so that the synchronous dephosphorization process is widely applied to the sewage plants with small operation water plants or transformation spaces.
The existing synchronous phosphorus removal and medicine feeding system mainly faces the following operation problems:
1. the medicine feeding system has low automation degree. The requirements on professional qualities such as experience and capability of operators are high, the operators operate in a fuzzy mode according to the experience, the dosage of the medicament is difficult to control accurately, and the medicament is often added excessively, so that the medicament is wasted; lack of immediate response and operation to real-time data, the degree of prejudgement to data change is not enough, can't deal with impact load, leads to going out that water TP can't stably reach standard.
2. Data lag, lack of monitoring of critical data. Most sewage plants only rely on TP on-line instruments at an inlet and an outlet to judge the dosage, firstly, the TP on-line instruments have complex detection procedures and long data processing time, so that the dosage can not be further judged and adjusted by quickly, simply and conveniently utilizing data; secondly, the monitoring points are only arranged at the outlet, once the concentration of the total phosphorus exceeds the standard, the concentration of the total phosphorus in the discharged water is adjusted, the continuous exceeding of the total phosphorus in the discharged water within a period of time is caused, and the worse influence is caused; thirdly, the key data of the dephosphorization process cannot be monitored, tracked and recorded in real time.
3. Lack of coordination with biochemical phosphorus removal causes deterioration of biochemical systems. Calculating chemical phosphorus removal amount according to the total phosphorus concentration of inlet water, the static biological phosphorus removal rate and the total phosphorus concentration of outlet water, and realizing the coordination control of chemical phosphorus removal and biological phosphorus removal; and the excessive addition of the medicament has adverse effects on the adsorption and sedimentation performance of the activated sludge, which causes the deterioration of a biochemical system.
4. The model has poor applicability and is invariable to be popularized. Most phosphorus removal and medicine addition control systems in the market generally have the defects of complex and bloated control algorithm modeling, more phosphorus removal control parameters in the model and overlong feedback time, so that the expected effect cannot be realized and the popularization cannot be widely realized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal, so that the intelligent dosing of a phosphorus removal agent is realized, and the aims of energy conservation, consumption reduction, management and control upgrading are achieved on the premise that the total phosphorus in effluent stably reaches the standard.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, an intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal is disclosed, comprising:
the system comprises a data acquisition unit, a control unit and a dosing cloud processor;
the data acquisition unit respectively acquires relevant parameters of water inlet and outlet of the biochemical system and transmits the parameters to the control unit;
the control unit and the dosing cloud processor perform information interaction;
the dosing cloud processor calls a medicament dosing model according to the received information, calculates the real-time medicament dosing amount and transmits the real-time medicament dosing amount to the control unit, and the control unit transmits a corresponding instruction to the dosing pump to accurately dose the medicament;
the dosing cloud processor evaluates the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time according to the received information, and if the evaluation result is lower than a set value, the intelligent dosing cloud processor sends an instruction for reducing an external reflux ratio to the residual sludge pump through the control unit, and meanwhile, adjusts an instruction for increasing the dosing flow rate to the dosing pump, so that the frequency of the dosing pump is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is carried out.
As a further technical scheme, the data acquisition unit comprises a feedforward system and a feedback system;
the feed-forward system comprises a water inlet flow meter, a water inlet total phosphorus online monitor, an aerobic pool orthophosphate detector, a secondary sedimentation pool effluent orthophosphate online monitor and an external reflux flow meter;
the water inlet flowmeter is arranged in the water inlet pipe, and the water inlet total phosphorus on-line monitor is connected in the water inlet pipe and respectively collects the water inlet flow and the water inlet total phosphorus concentration;
the aerobic tank orthophosphate monitor is arranged at the tail end of the aerobic tank and used for collecting the concentration of orthophosphate in the effluent of the aerobic tank;
the external reflux flowmeter is arranged on the sludge reflux pipeline and is used for collecting the amount of the reflux sludge;
the feedback system comprises a secondary sedimentation tank effluent orthophosphate meter connected with a secondary sedimentation tank effluent pipe.
As a further technical scheme, the biochemical system comprises an anaerobic tank, an aerobic tank and a secondary sedimentation tank, and the matched equipment comprises a sludge reflux pump, an excess sludge pump, a dosing tank and a dosing pump;
the pretreated sewage flows through an anaerobic tank and an aerobic tank in sequence, phosphorus in the sewage is enriched in activated sludge through anaerobic phosphorus release and aerobic excessive phosphorus absorption, sludge-water mixed liquor is precipitated and separated in a secondary sedimentation tank, supernatant enters a next treatment unit, partial sludge flows back to the anaerobic tank through a sludge reflux pump, residual sludge is discharged outside through a residual sludge pump, and a medicament is stored in a medicament feeding tank and is conveyed to a water outlet of the aerobic tank through a medicament feeding pump.
In a second aspect, an intelligent dosing dephosphorization control method based on synchronous dephosphorization is disclosed, which comprises the following steps:
calling a medicament adding model according to the received information, calculating the real-time medicament adding amount, transmitting a corresponding instruction to a medicament adding pump, and accurately adding the medicament;
and evaluating the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time based on the information after the addition of the medicament, if the evaluation result is lower than a set value, sending an instruction for reducing the external reflux ratio to the excess sludge pump, and simultaneously, adjusting the instruction for increasing the addition flow to the dosing pump, so that the frequency of the dosing pump is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is carried out.
As a further technical scheme, the medicament adding model specifically comprises the following steps:
in the formula: q Medicine The dosage of the medicament is L/h; q 1 For the inflow, m 3 /h；Q R For the external reflux flow rate, m 3 /h；C oppv Is the measured value of orthophosphate in the effluent of the aerobic tank, mg/L; c opsv Is an orthophosphate base reference value, mg/L;
omega is the ratio of the total phosphorus value of the supernatant of the effluent of the aerobic tank to orthophosphate; k op The addition coefficient of the phosphorus removing agent is changed according to the concentration of orthophosphate in the effluent of the aerobic tank; n is a reaction efficiency correction coefficient;
K fb is a feedback coefficient; c a Is a reference concentration C opsv The optimal dosage of the phosphorus removal medicament is mg/L; rho a The density of the phosphorus removing agent is g/L, and is set according to an actual measured density interface of the phosphorus removing agent.
As a further technical solution, the parameter C a Determination of (1): determination of omega C by beaker test opsv Under the concentration, the relation experiment of the removal of the total phosphorus and the adding amount of the medicament is carried out to obtain a relation curve of the removal rate of the total phosphorus and the adding amount of the medicament, thereby obtaining the adding amount C corresponding to the removal rate x% under the condition of reaching the effluent standard a 。
As a further technical solution, the parameter n is determined:
when oxidizedTotal phosphorus concentration C of effluent of ditch oppv ＝C opsv In time, the removal rate x of the total phosphorus in the effluent 0 At this time, the corresponding dosage is C a Corresponding n =1;
when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＞C opsv Then, the removal rate x of the total phosphorus in the effluent is more than x 0 The corresponding dosage is more than C a And the corresponding n is more than 1, so that the effluent quality is guaranteed to reach the standard; preliminarily setting n =1.5, gradually reducing the value of n after running for a period of time, and gradually carrying out self-learning and then self-adjusting according to running data;
when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＜C opsv In the process, the removal rate x of the total phosphorus in the effluent is less than x 0 The corresponding dosage is more than C a N is less than 1; and preliminarily setting n =1, gradually reducing the value of n after running for a period of time, and gradually performing self-learning and self-adjusting according to running data.
As a further technical solution, K fb The value of the feedback coefficient is between 0.8 and 1.2 according to the concentration C of orthophosphate in the effluent of the secondary sedimentation tank 3 And the set concentration.
As a further technical scheme, the biochemical phosphorus removal rate evaluation model specifically comprises the following steps:
in the formula: eta BR Biochemical phosphorus removal efficiency at the time t; q 1 For the inflow, m 3 /h；Q R For the external reflux flow rate, m 3 /h；C oppv Is the measured value of orthophosphate in the effluent of the aerobic tank, mg/L; c 1 The total phosphorus concentration of the inlet water is mg/L; sigma η The phosphorus removal rate level at the moment t and the deviation of the biochemical phosphorus removal efficiency relative to the average value of the biochemical phosphorus removal rate in the last 7 days at the moment are shown.
As a further technical scheme, the dosing cloud processor is used for processing according to the inflow Q 1 Total phosphorus concentration of influent C 1 External reflux quantity Q R And the concentration C of orthophosphate in the effluent of the aerobic tank oppv Real-time evaluation of phosphorus removal efficiency eta of biochemical system BR And the current phosphorus removal rate level σ η 。
As a further technical scheme, the dosing cloud processor performs model optimization and iteration based on a neuron algorithm of historical data;
the dosing cloud processor utilizes the feedforward/feedback parameters of the previous N days and the model output dosing amount to establish a training sample database; establishing an inspection sample database by using the data of N' days; based on a training sample database, establishing a dosing amount prediction model and an effluent total phosphorus prediction model through an AI algorithm, verifying the reliability of the prediction model through checking the sample database, and continuously optimizing dosing model parameters; the optimized dosing model is adopted, and the dosing amount is further optimized based on instantaneous feedforward/feedback data;
excellent historical data is screened, the steps are repeated, the model is continuously optimized through repeated dynamic training, the difference value between the measured value and the predicted value is reduced, and the running cost is saved.
The above one or more technical solutions have the following beneficial effects:
the invention realizes the linkage operation of equipment and the cooperative control of chemical phosphorus removal and biochemical phosphorus removal by embedding the medicament adding model and the chemical phosphorus removal model; the model is simple and practical; the multiple effects of reaching the standard of the water quality of the sewage plant, saving energy, reducing consumption, controlling upgrading and finely managing are realized; the system has a self-learning function, continuously corrects the parameter setting of the process model, and can continuously improve and improve the operating efficiency of the dosing system, so that the dosing amount is more accurate, and the medicament cost is lower.
The method is based on the modeling of the chemical phosphorus removal workshop section of synchronous phosphorus removal, selects key parameters, has short feedforward and feedback time of the model, is quick to react, eliminates a large number of interference values, and has concise model and strong universality.
Through automatic and intelligent operation, the subjectivity, the hysteresis and the uncertainty of manual feeding are avoided, the labor intensity of personnel is greatly reduced, and the labor cost is saved; the system continuously corrects the parameter setting of the process model through self-learning, so that the operation efficiency of the dosing system can be continuously improved and improved, the dosing amount is more accurate, and the medicament cost is lower.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal according to an embodiment of the present invention;
in the figure, a water inlet flow meter 1, a water inlet total phosphorus online monitor 2, an aerobic tank orthophosphate detector 3, a secondary sedimentation tank effluent orthophosphate online monitor 4 and an external reflux flow meter 5 are arranged; 6 an anaerobic tank, 7 an aerobic tank, 8 a secondary sedimentation tank, 9 a sludge reflux pump, 10 a residual sludge pump, 11 a dosing tank and 12 a dosing pump; 13 a PLC controller; 14 intelligent dosing cloud processor.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
Referring to the attached drawing 1, the embodiment discloses an intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal, which comprises a process instrument, process equipment, a PLC control system and an intelligent dosing cloud processor.
The data acquisition unit is a process instrument, consists of a feedforward system and a feedback system, and comprises a water inlet flow meter 1, a water inlet total phosphorus online monitor 2, an aerobic pool orthophosphate detector 3, a secondary sedimentation pool water outlet orthophosphate online monitor 4 and an external reflux flow meter 5. The water inlet flowmeter 1 in the feedforward system is arranged on a water inlet pipe of an anaerobic tank, the input end of a total phosphorus on-line monitor 2 is connected to the water inlet pipe of the anaerobic tank to collect the water inlet flow and the total phosphorus concentration of the water inlet, and an orthophosphate monitor 3 in an aerobic tank is placed at the tail end of the aerobic tank in a sampling system to collect the orthophosphate concentration in the water outlet of the aerobic tank; the external reflux flowmeter 5 is arranged on the sludge reflux pipeline and used for collecting the amount of the reflux sludge. The feedback system is a secondary sedimentation tank effluent orthophosphate meter 4 which is connected with a secondary sedimentation tank effluent pipe.
The feedforward system and the feedback system are both connected to the PLC control system, collected data are transmitted to the PLC control system, and the PLC control system transmits the collected data to the intelligent dosing cloud processor.
The biochemical system is a process device and comprises an anaerobic tank 6, an aerobic tank 7, a secondary sedimentation tank 8, a sludge reflux pump 9, an excess sludge pump 10, a dosing tank 11 and a dosing pump 12.
Pretreated sewage flows through an anaerobic tank 6 and an aerobic tank 7 in sequence, phosphorus in the sewage is enriched in activated sludge through anaerobic phosphorus release and aerobic excessive phosphorus absorption, sludge-water mixed liquor is precipitated and separated through a secondary sedimentation tank 8, supernatant enters a next treatment unit, partial sludge flows back to the anaerobic tank 6 through an external reflux pump 9, and residual sludge is discharged through a residual sludge pump 10. The medicament is stored in a medicament feeding tank 11 and is conveyed to the water outlet of the aerobic tank 7 by a medicament feeding pump.
Specifically, the control unit is a PLC (programmable logic controller) 13, the PLC can realize data acquisition and transmission and related instruction execution, the input ends of the PLC are provided with a feedforward system and a feedback system instrument, and the output ends of the PLC are connected with an intelligent dosing cloud processor 14, a dosing pump 12, an external reflux pump 9 and a residual sludge pump 10; the intelligent dosing cloud processor 14 is embedded with a medicament dosing model and a biochemical phosphorus removal rate evaluation model, and can realize functions of instant response, storage analysis, dynamic dosing control and the like of data.
Example two
Based on the control system in the first embodiment example, the purpose of this embodiment is to provide an intelligent dosing phosphorus removal control method based on synchronous phosphorus removal, including:
calling a medicament adding model according to the received information, calculating the real-time medicament adding amount, transmitting a corresponding instruction to a medicament adding pump, and accurately adding the medicament;
and evaluating the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time based on information after medicament addition, if the evaluation result is lower than a set value, sending an instruction for reducing the external reflux ratio to the excess sludge pump, and simultaneously, adjusting an instruction for increasing the addition flow rate to the dosing pump, so that the dosing pump frequency is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is carried out.
In this embodiment, the medicament adding model specifically includes:
in the formula:
Q medicine The dosage of the medicament is L/h;
Q 1 -flow rate of water inlet, m 3 /h；
Q R -external reflux flow rate, m 3 /h；
C oppv -the measured value of orthophosphate in the effluent of the aerobic tank is mg/L;
C opsv -the orthophosphate reference value is a medium-high frequency value, mg/L, in the measured value of the orthophosphate of the effluent of the aerobic tank;
omega is the ratio of the total phosphorus value of the mixed sludge supernatant fluid of the aerobic tank effluent to orthophosphate, and is determined by a beaker experiment.
K op -dephosphorizationThe adding coefficient of the agent is changed according to the concentration of orthophosphate in the effluent of the aerobic tank;
n is a reaction efficiency correction coefficient, and is gradually optimized after self-learning according to the operation data;
K fb the value of the feedback coefficient is between 0.8 and 1.2 according to the concentration C of orthophosphate in the effluent of the secondary sedimentation tank 3 The concentration is determined according to the set concentration, and the self-learning is carried out according to the operation data, and then the optimization is carried out step by step;
C a -reference concentration C opsv The optimal dosing amount of the phosphorus removal medicament can be obtained by obtaining a dosing curve through a beaker experiment (an experiment on the relationship between the removal of orthophosphate and the dosing amount), and the optimal dosing amount of the medicament, namely mg/L, is obtained according to the dosing curve;
ρ a the density of the phosphorus removing agent, g/L, is set according to an actual measured density interface of the phosphorus removing agent.
More specifically, the determining steps of the parameters are as follows:
s1: and determining the parameter omega. Omega represents the ratio of the total phosphorus value of the mixed sludge supernatant in the effluent of the aerobic tank to orthophosphate, and is determined by a beaker experiment. In biochemical systems, the ratio of orthophosphate concentration to total phosphorus is often in quantitative relation, and the omega balance is confirmed to be 1.18 through experiments.
S2: parameter C opsv Is determined. Collecting orthophosphate data of 3 months of effluent of an aerobic tank in a first-stage AAO biochemical tank of a gorge mountain sewage plant administered by a broad industry group, and performing statistical analysis on the orthophosphate data to obtain C opsv I.e. total phosphorus concentration of ω C opsv 。
S3: parameter C a And (4) determining. Determination of omega C by beaker test opsv Under the concentration, the relation experiment of the removal of the total phosphorus and the adding amount of the medicament is carried out to obtain a relation curve of the removal rate of the total phosphorus and the adding amount of the medicament, thereby obtaining the adding amount C corresponding to the removal rate x% under the standard condition of effluent a 。
S4: and determining the parameter n.
S401: when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＝C opsv In the process, the removal rate x of the total phosphorus in the effluent is required to be reached 0 At this time, the corresponding dosage is C a Corresponding ton＝1；
S402: when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＞C opsv Then, the removal rate x of the total phosphorus in the effluent is more than x 0 The corresponding dosage is more than C a And the corresponding n is more than 1, so that the effluent quality is guaranteed to reach the standard; preliminarily setting n =1.5, gradually reducing the value of n after running for a period of time, and gradually carrying out self-learning and then self-adjusting according to running data;
s403: when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＜C opsv In the process, the removal rate x of the total phosphorus in the effluent is less than x 0 The corresponding dosage is more than C a Corresponding n < 1; and preliminarily setting n =1, gradually reducing the value of n after running for a period of time, and gradually performing self-learning and self-adjusting according to running data.
S5: parameter K fb Is determined. The value is between 0.8 and 1.2, and the concentration of orthophosphate in the effluent of the secondary sedimentation tank is dependent on the concentration C of the orthophosphate 3 And the concentration is determined according to the set concentration, and the self-learning is gradually optimized according to the operation data.
The intelligent dosing cloud processor can dynamically adjust the dosing amount according to the feedforward and feedback parameters, gradually optimize the dosing of the medicament according to self-learning and data iteration of the system, effectively save the medicament and labor cost on the premise of ensuring that the effluent reaches the standard, and achieve the purposes of control upgrading and fine management of a sewage plant.
Because the detection process of the total phosphorus online instrument is complex, the data processing time is long, and the data lag is caused, the orthophosphate online monitoring is introduced to replace the total phosphorus online monitoring, the measurement is rapid, the accuracy is high, and the real and effective data support is provided for the stable operation of a dosing system; only modeling is carried out on chemical phosphorus removal in synchronous phosphorus removal, the model is simple, the control parameters are few, the determination is convenient, and the universality is strong.
In this embodiment, the biochemical phosphorus removal rate evaluation model specifically includes:
in the formula:
η BR biochemical phosphorus removal efficiency at time t;
Q 1 flow of inlet water, m 3 /h；
Q R External reflux flow rate, m 3 /h；
C oppv The measured value of orthophosphate of effluent of the aerobic tank is mg/L;
C 1 -inlet water total phosphorus concentration, mg/L;
σ η the phosphorus removal rate level at the moment t and the deviation of the biochemical phosphorus removal efficiency relative to the average value of the biochemical phosphorus removal rate in the last 7 days at the moment.
The intelligent dosing cloud processor 14 is used for processing according to the water inflow Q 1 Total phosphorus concentration of influent C 1 External reflux quantity Q R And the concentration C of orthophosphate in the effluent of the aerobic tank oppv Can evaluate the phosphorus removal efficiency eta of the biochemical system in real time BR And the current phosphorus removal rate level σ η When η BR Low (e.g. less than 50%) or σ η (if the content of the chemical agent is lower than 80%), which indicates that the biochemical system has low phosphorus removal efficiency due to insufficient sludge discharge, at the moment, the intelligent agent-adding cloud processor 14 sends an instruction for reducing the external reflux ratio to the excess sludge pump 10 through the PLC 13, the frequency of the excess sludge pump 10 is reduced, and the flow of the excess sludge pipeline is reduced at the moment. Meanwhile, the instruction for increasing the adding flow rate is sent to the dosing pump 12 by adjustment, so that the frequency of the dosing pump 12 is increased, the dosing flow rate is increased, and the linkage control of chemical dosing dephosphorization and biological sludge discharge dephosphorization is realized.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides an intelligence adds medicine dephosphorization control system based on synchronous dephosphorization, characterized by includes:
the system comprises a data acquisition unit, a control unit and a dosing cloud processor;
the data acquisition unit respectively acquires relevant parameters of water inlet and outlet of the biochemical system and transmits the parameters to the control unit;
the control unit and the dosing cloud processor perform information interaction;
the dosing cloud processor calls a medicament dosing model according to the received information, calculates the real-time medicament dosing amount and transmits the real-time medicament dosing amount to the control unit, and the control unit transmits a corresponding instruction to the dosing pump to accurately dose the medicament;
the dosing cloud processor evaluates the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time according to the received information, and if the evaluation result is lower than a set value, the intelligent dosing cloud processor sends an instruction for reducing the external reflux ratio to the residual sludge pump through the control unit, and simultaneously adjusts an instruction for increasing the dosing flow to the dosing pump, so that the frequency of the dosing pump is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is performed.
2. The intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal as claimed in claim 1, wherein said data acquisition unit comprises a feedforward system and a feedback system;
the feed-forward system comprises a water inlet flow meter, a water inlet total phosphorus online monitor, an aerobic pool orthophosphate detector, a secondary sedimentation pool water outlet orthophosphate online monitor and an external reflux flow meter;
the water inlet flow meter is arranged in the water inlet pipe, and the total phosphorus online monitor for inlet water is connected in the water inlet pipe and respectively acquires the inlet water flow and the inlet water total phosphorus concentration;
the aerobic tank orthophosphate monitor is arranged at the tail end of the aerobic tank and used for collecting the concentration of orthophosphate in the effluent of the aerobic tank;
the external reflux flowmeter is arranged on the sludge reflux pipeline and is used for collecting the amount of the reflux sludge;
the feedback system comprises a secondary sedimentation tank effluent orthophosphate meter connected with a secondary sedimentation tank effluent pipe.
3. The intelligent dosing and phosphorus removal control system based on synchronous phosphorus removal of claim 1, wherein the biochemical system comprises an anaerobic tank, an aerobic tank, a secondary sedimentation tank and supporting equipment, namely a sludge reflux pump, an excess sludge pump, a dosing tank and a dosing pump;
the pretreated sewage flows through an anaerobic tank and an aerobic tank in sequence, phosphorus in the sewage is enriched in activated sludge through anaerobic phosphorus release and aerobic excessive phosphorus absorption, sludge-water mixed liquor is precipitated and separated in a secondary sedimentation tank, supernatant enters a next treatment unit, partial sludge flows back to the anaerobic tank through a sludge reflux pump, residual sludge is discharged outside through a residual sludge pump, and a medicament is stored in a medicament feeding tank and is conveyed to a water outlet of the aerobic tank through a medicament feeding pump.
4. An intelligent dosing dephosphorization control method based on synchronous dephosphorization is characterized by comprising the following steps:
calling a medicament adding model according to the received information, calculating the real-time medicament adding amount, transmitting a corresponding instruction to a medicament adding pump, and accurately adding the medicament;
and evaluating the phosphorus removal efficiency and the current phosphorus removal rate level of the biochemical system in real time based on information after medicament addition, if the evaluation result is lower than a set value, sending an instruction for reducing the external reflux ratio to the excess sludge pump, and simultaneously, adjusting an instruction for increasing the addition flow rate to the dosing pump, so that the dosing pump frequency is increased, and the linkage control of chemical phosphorus removal and biological phosphorus removal is carried out.
5. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal as claimed in claim 4, wherein the medicament dosing model specifically comprises:
in the formula:
Q medicine Adding the dosage of the medicament, L/h; q 1 For the inflow, m 3 /h；Q R For the external reflux flow rate, m 3 /h；C oppv Is the measured value of orthophosphate in the effluent of the aerobic tank, mg/L; c opsv Is an orthophosphate base reference value, mg/L;
omega is the ratio of the total phosphorus value of the mixed sludge supernatant in the effluent of the aerobic tank to orthophosphate; k op The adding coefficient of the phosphorus removing agent is changed according to the concentration of orthophosphate in the effluent of the aerobic tank; n is a reaction efficiency correction coefficient;
K fb is a feedback coefficient; c a Is a reference concentration C opsv The optimal dosage of the phosphorus removal medicament is mg/L; rho a The density of the phosphorus removing agent is g/L, and is set according to an actual measured density interface of the phosphorus removing agent.
6. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal as claimed in claim 5, wherein parameter C a Determination of (1): determination of omega C by beaker test opsv Under the concentration, the relation experiment of the removal of the total phosphorus and the adding amount of the medicament is carried out to obtain a relation curve of the removal rate of the total phosphorus and the adding amount of the medicament, thereby obtaining the adding amount C corresponding to the removal rate x% under the standard condition of effluent a 。
7. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal as claimed in claim 5, wherein the parameter n is determined by:
when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＝C opsv In the process, the removal rate x of the total phosphorus in the effluent is required to be reached 0 At this time, the corresponding dosage is C a Corresponding n =1;
when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＞C opsv Then, the removal rate x of the total phosphorus in the effluent is more than x 0 The corresponding dosage is more than C a And the corresponding n is more than 1, so that the effluent quality is guaranteed to reach the standard; first stageStep setting, namely n =1.5, after the operation is carried out for a period of time, gradually reducing the value of n, and gradually carrying out self-learning and then self-adjusting according to operation data;
when the total phosphorus concentration C of the effluent of the oxidation ditch oppv ＜C opsv In the process, the removal rate x of the total phosphorus in the effluent is less than x 0 The corresponding dosage is more than C a N is less than 1; and preliminarily setting n =1, gradually reducing the value of n after running for a period of time, and gradually performing self-learning and self-adjusting according to running data.
8. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal of claim 5, wherein K is fb The value of the feedback coefficient is between 0.8 and 1.2 according to the concentration C of orthophosphate in the effluent of the secondary sedimentation tank 3 And the set concentration.
9. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal as claimed in claim 4, wherein the biochemical phosphorus removal rate evaluation model specifically comprises:
in the formula: eta BR Biochemical phosphorus removal efficiency at the time t; q 1 For the inflow, m 3 /h；Q R For the external reflux flow rate, m 3 /h；C oppv Is the measured value of orthophosphate of the effluent of the aerobic tank, mg/L; c 1 The total phosphorus concentration of the inlet water is mg/L; sigma η The phosphorus removal rate level at the moment t and the deviation of the biochemical phosphorus removal efficiency relative to the average value of the biochemical phosphorus removal rate in the last 7 days at the moment;
preferably, the dosing cloud processor is used for controlling the dosing according to the inflow Q 1 And the total phosphorus concentration C of the feed water 1 External reflux quantity Q R The effluent of the aerobic tank is positivePhosphate concentration C oppv Phosphorus removal efficiency eta of real-time evaluation biochemical system BR And the current phosphorus removal rate level σ η 。
10. The intelligent dosing phosphorus removal control method based on synchronous phosphorus removal as claimed in claim 4, wherein said dosing cloud processor performs model optimization and iteration based on historical data neuron algorithm;
the dosing cloud processor utilizes the feedforward/feedback parameters of the previous N days and the model output dosing amount to establish a training sample database; establishing an inspection sample database by using data of N days;
based on a training sample database, establishing a dosing amount prediction model and a water outlet total phosphorus prediction model through an AI algorithm, verifying the reliability of the prediction model through checking the sample database, and continuously optimizing the parameters of the dosing model; optimizing the adding amount based on instantaneous feedforward/feedback data by adopting an optimized adding model;
and screening excellent historical data, repeating the steps, and continuously optimizing the model through repeated dynamic training to reduce the difference value between the measured value and the predicted value.
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