CN113264616B - Micro-flocculation ultrafiltration precise dosing control method and system - Google Patents
Micro-flocculation ultrafiltration precise dosing control method and system Download PDFInfo
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- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 132
- 238000005189 flocculation Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000008394 flocculating agent Substances 0.000 claims abstract description 101
- 238000011001 backwashing Methods 0.000 claims abstract description 98
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- 238000004364 calculation method Methods 0.000 claims abstract description 27
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- 239000003814 drug Substances 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
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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
- C02F1/5209—Regulation methods for flocculation or precipitation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/16—Feed pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/22—Controlling or regulating
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
Abstract
The disclosure relates to a micro-flocculation ultrafiltration precise dosing control method and system; the micro-flocculation ultrafiltration precise dosing control method comprises the following steps: when the ultrafiltration system operates, acquiring a real-time transmembrane pressure difference; acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period; and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result. Therefore, the accurate addition of the flocculating agent is realized, the stable operation of an ultrafiltration system is ensured, and the energy is saved and the consumption is reduced.
Description
Technical Field
The disclosure relates to the technical field of sewage treatment, in particular to a micro-flocculation ultrafiltration accurate dosing control method and system.
Background
When water treatment is carried out, in particular to sewage upgrading reconstruction or recycling, ultrafiltration is a common membrane separation treatment process. However, as the ultrafiltration membrane system is operated, the pollution is gradually accumulated and increased to cause the membrane blockage, and the consequence is that the energy consumption of the ultrafiltration operation is increased and even the water yield of the ultrafiltration system is reduced.
In the prior art for retarding the pollution of the ultrafiltration membrane, the micro-flocculation ultrafiltration adopts ultrafiltration inlet water filtration, and simultaneously, a flocculating agent is synchronously added on line at an ultrafiltration inlet end for micro-flocculation reaction, so that the membrane pollution can be effectively relieved, the operation energy consumption is reduced, the stable operation of an ultrafiltration system is ensured, and the constant water yield is provided.
However, the existing micro-flocculation dosing system is simple and too direct, is used for continuous constant dosing, and can only be judged manually in most cases for the variation of the water quality fluctuation of the water flow and the running state of the ultrafiltration membrane, so that the dosing amount of the medicament is simply increased. The adjustment is lagged and inaccurate, the adjustment amount of the medicament is less or more and more frequent, and especially under the condition of fluctuation of the water amount or water quality, the effect is difficult to ensure, so that the running state of the system is unstable or worsened.
Disclosure of Invention
In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a micro-flocculation ultrafiltration precise dosing control method and system.
The invention provides a micro-flocculation ultrafiltration accurate dosing control method, which comprises the following steps:
when the ultrafiltration system operates, acquiring a real-time transmembrane pressure difference;
acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period;
and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result.
In an embodiment of the present disclosure, the calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add a flocculant and adjust the adding amount according to the calculation result include:
and if the real-time transmembrane pressure difference is greater than the maximum allowable transmembrane pressure difference before backwashing and lasts for a preset first time period, adding a preset adding amount of the flocculating agent after the first time period is ended.
In an embodiment of the present disclosure, the calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add a flocculant and adjust the adding amount according to the calculation result include:
acquiring a first transmembrane pressure difference value of the real-time transmembrane pressure difference and the fixed transmembrane pressure difference;
acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, and acquiring a time difference value between the real-time moment and the target moment;
and calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a preset adding amount of the flocculating agent after the second time period is ended when the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period.
In one embodiment of the disclosure, the preset backwashing number per chemically enhanced backwashing period is 1, and the maximum allowable pre-backwashing transmembrane pressure difference is the maximum allowable pre-backwashing transmembrane pressure difference;
and the preset backwashing times in each chemical reinforced backwashing period are more than 1, and the maximum transmembrane pressure difference before the current backwashing times is calculated according to the maximum transmembrane pressure difference before the allowable first backwashing, the maximum transmembrane pressure difference before the allowable maximum backwashing times, the current backwashing times and the maximum backwashing times.
In an embodiment of the present disclosure, the preset number of backwashing times in each chemically enhanced backwashing period is greater than 1, the calculating is performed according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the allowable transmembrane pressure difference before backwashing, and whether to perform the addition and the addition amount adjustment of the flocculant is determined according to the calculation result, including:
acquiring historical real-time transmembrane pressure difference and historical fixed transmembrane pressure difference at the same time of the previous filtering period;
obtaining a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference, and obtaining a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference;
and calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a preset adding amount of the flocculating agent after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period.
In an embodiment of the present disclosure, the method for controlling precise dosing of micro-flocculation ultrafiltration further includes:
adding a preset adding amount of the flocculating agent and continuously presetting a fourth time period, wherein the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and continuously presetting a first time period, and adding the flocculating agent with an increment adding amount after the first time period is finished; wherein the increment addition amount is larger than the preset addition amount; or the like, or, alternatively,
when a preset adding amount of the flocculating agent is added and a preset fourth time period continues, if the first ratio calculated at the current moment is greater than or equal to a preset first ratio threshold and continues for a preset second time period, adding the flocculating agent with the increment adding amount after the second time period is ended; or the like, or, alternatively,
and in the adding of the flocculant with the preset adding amount and the continuous preset fourth time period, the second ratio calculated at the current moment is more than or equal to the preset second ratio threshold value and the continuous preset third time period, and after the third time period is finished, the flocculant with the incremental adding amount is added.
In an embodiment of the present disclosure, the method for controlling precise dosing of micro-flocculation ultrafiltration further includes:
continuously adding the flocculating agent with the increment adding amount and continuously presetting a fifth time period, wherein the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and continuously presetting the first time period, and then continuously adding the flocculating agent with the increment adding amount and sending alarm prompt information; or the like, or, alternatively,
continuously adding the flocculating agent with the increment addition amount and sending alarm prompt information when a first ratio calculated at the current moment is greater than or equal to a preset first ratio threshold value and is continuously preset for a second time period in a fifth time period continuously preset by adding the flocculating agent with the increment addition amount; or the like, or, alternatively,
continuously adding the flocculating agent with the increment addition amount and sending alarm prompt information when a second ratio calculated at the current moment is greater than or equal to a preset second ratio threshold value and is continuously preset for a third time period in the adding of the flocculating agent with the increment addition amount and the fifth time period;
and sending alarm prompt information, wherein the alarm prompt information comprises information for prompting a user to check whether the running state of the ultrafiltration system or the adding state of the flocculating agent has a fault.
In an embodiment of the present disclosure, the method for controlling precise dosing of micro-flocculation ultrafiltration further includes:
obtaining the water temperature and the turbidity of the incoming water;
and adjusting the adding amount of the flocculating agent according to the temperature or turbidity of the incoming water.
In an embodiment of the present disclosure, the method for controlling precise dosing of micro-flocculation ultrafiltration further includes:
acquiring historical operating data of the ultrafiltration system;
inputting the historical operation data into a neural network for training to obtain a training value;
establishing a corresponding physical model according to the running process of the ultrafiltration system, and solving the physical model to obtain a solved value;
calculating the matching degree of the training value and the solving value, and adjusting the network parameters of the neural network and the model parameters of the physical model until the error between the matching degree and a preset matching degree threshold value is within a preset error range;
and determining a micro-flocculation ultrafiltration precise dosing control parameter and a weight corresponding to the parameter according to the network parameter of the neural network and the model parameter of the physical model.
The utility model provides an accurate medicine control system that adds of little flocculation ultrafiltration, include:
the first transmembrane pressure difference acquisition module is used for acquiring real-time transmembrane pressure difference when the ultrafiltration system operates;
the second transmembrane pressure difference acquisition module is used for acquiring a fixed transmembrane pressure difference at a target moment of a preset initial period in a current filtering period and a preset maximum value of a transmembrane pressure difference before backwashing, which corresponds to the current filtering period;
and the calculation processing module is used for calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result.
The present disclosure provides an ultrafiltration system, comprising the above-mentioned micro-flocculation ultrafiltration accurate dosing control system, a water supply system, an ultrafiltration membrane group, a water production system, a cleaning system, a micro-flocculation dosing system, and a program control system;
the water supply system is used for providing required water inlet and pressure for ultrafiltration operation;
the ultrafiltration membrane group is used for carrying out solid-liquid separation on raw water, intercepting pollutants and producing clear water;
the water production system is used for providing storage or drainage direction for water produced by the ultrafiltration system;
the cleaning system is used for providing maintenance cleaning and recovery cleaning for the ultrafiltration system, removing trapped pollutants and recovering the initial filtration performance of the ultrafiltration system;
the micro-flocculation dosing system is used for providing synchronous feeding of a flocculating agent at the water inlet end for ultrafiltration;
and the micro-flocculation ultrafiltration accurate dosing control system is used for controlling the accurate dosing of the flocculating agent.
And the program control system is used for providing full-automatic control continuous operation for the operation of the ultrafiltration system, and synchronously monitoring, observing and feeding back corresponding operation data or states and faults or alarming.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
acquiring real-time transmembrane pressure difference when an ultrafiltration system operates; acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period; and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result. Therefore, the accurate addition of the flocculating agent is realized, the stable operation of an ultrafiltration system is ensured, and the energy is saved and the consumption is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a method for controlling precise dosing of micro-flocculation ultrafiltration according to an embodiment of the present disclosure;
FIG. 2 is an exemplary diagram of a training simulation according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a micro-flocculation ultrafiltration precise dosing control system according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of an ultrafiltration system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another micro-flocculation ultrafiltration precise dosing control system according to the embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
In practical application, there are two types of intelligent dosing systems for water treatment, one is realized by an automatic program control system, but the intelligent dosing system is limited by factors such as simple conditions, uncertainty and hysteresis, and cannot achieve a stable effect. The other type is to realize further intelligent regulation and control through an intelligent algorithm, and the effect is better but still not ideal. And currently, no reference or appropriate precise dosing method exists for the micro-flocculation dosing system.
Therefore, the present disclosure provides a micro-flocculation ultrafiltration precise dosing control method, which obtains a real-time transmembrane pressure difference when an ultrafiltration system operates; acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and an allowable transmembrane pressure difference maximum value before backwashing corresponding to the current filtering period; and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result. Therefore, the accurate addition of the flocculating agent is realized, the stable operation of an ultrafiltration system is ensured, and the energy is saved and the consumption is reduced.
Fig. 1 is a schematic flow chart of a micro-flocculation ultrafiltration precise dosing control method according to an embodiment of the present disclosure.
As shown in fig. 1, includes:
and 101, acquiring a real-time transmembrane pressure difference when the ultrafiltration system operates.
In the embodiment of the disclosure, the real-time transmembrane pressure difference refers to the transmembrane pressure difference corresponding to the operation of the ultrafiltration system at the current moment; where the transmembrane pressure difference is defined as the pressure required to drive water across the membrane, the difference between the water inlet pressure and the water production pressure. At lower water temperatures, higher fluxes and contamination, the transmembrane pressure difference is higher.
And 102, acquiring a fixed transmembrane pressure difference at a target moment of a preset initial period in the current filtering period and a preset maximum value of the transmembrane pressure difference before backwashing, which corresponds to the current filtering period.
And 103, calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result.
In the embodiment of the disclosure, before the ultrafiltration system operates, a default initial dosage of a flocculant, such as PAC (Poly aluminum Chloride) is automatically output according to the water quality of raw water and a preset working condition, that is, the preset dosage (calculated by effective metal ions in the flocculant) is c 1-c 2. Wherein, c1May be 0.2mg/L, c2May be 1.0 mg/L.
Wherein, the water quality condition of the raw water comprises the type of the raw water, the preorder pretreatment process, the temperature of inlet water and the turbidity range of the inlet water; the preset working condition comprises: membrane flux, filtration time, backwash time, chemically enhanced backwash interval period were run.
In the embodiment of the present disclosure, the preset initial period may be set according to an application scenario, for example, a filtering cycle time is T, and 1/3 × T is the preset initial period.
In the embodiment of the disclosure, any one time of a preset initial period can be selected as a target time according to application scene requirements, and the transmembrane pressure difference corresponding to the target time is obtained as a fixed transmembrane pressure difference.
In the embodiment of the present disclosure, the preset maximum allowable pre-backwashing transmembrane pressure difference corresponding to the current filtration period may be calculated by a preset formula, and specifically, it is assumed that the maximum allowable pre-backwashing transmembrane pressure difference for the first time in each chemically enhanced backwashing period is P1The filtration-backwashing times in each chemical reinforced backwashing period are M times, and the maximum allowable transmembrane pressure difference before the Mth backwashing is PMThen the maximum allowable transmembrane pressure difference before the Nth backwashing (1. ltoreq. N. ltoreq.M) is: when N =1, PN= P1(ii) a When N is more than 1 and less than or equal to M,
。
wherein, P1、 PMThe value of (A) is set according to the actual situation, the accumulated operation time of the membrane element is less than 3 months, and P is set when the working condition is good1-1And PM-1(ii) a The accumulated operation time of the membrane element exceeds 3 months and when the working condition is good, the accumulated operation time is P1-2And PM-2When the accumulated operation time of the membrane element exceeds 3 months and the working condition is poor, the accumulated operation time is P1-3And PM-3. Optionally, P1-1And PM-1、 P1-2And PM-2、 P1-3And PM-3Respectively 0.20 and 0.30bar, 0.25 and 0.35bar, 0.30 and 0.40 bar.
It can be understood that the quality of the operation condition is comprehensively judged by the preset condition. When the operating membrane flux, the filtering time, the backwashing time and the chemical strengthening backwashing interval are all the optimal values, the operating membrane flux is a better working condition, and the operating membrane flux, the filtering time, the backwashing time and the chemical strengthening backwashing interval are all poorer working conditions under other conditions.
In the embodiment of the present disclosure, there are various ways of performing calculation according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculant and adjust the addition amount according to the calculation result, which are described as follows.
In a first example, the real-time transmembrane pressure difference is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and lasts for a preset first time period, and then a preset adding amount of flocculant is added after the first time period is finished.
The second example is that a first transmembrane pressure difference value of a real-time transmembrane pressure difference and a fixed transmembrane pressure difference is obtained, a real-time moment corresponding to the real-time transmembrane pressure difference is obtained, a time difference value between the real-time moment and a target moment is obtained, a first ratio of the first transmembrane pressure difference value to the time difference value is calculated, and after the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period, a preset adding amount of flocculant is added after the second time period is finished.
In a third example, the number of backwashes preset per chemically enhanced backwash cycle is currently greater than 1. Obtaining historical real-time transmembrane pressure difference and historical fixed transmembrane pressure difference at the same time of the previous filtering period, obtaining a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference and obtaining a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference, calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a flocculating agent with a preset adding amount after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period.
In summary, the method for controlling precise dosing of the micro-flocculation ultrafiltration disclosed by the invention obtains the real-time transmembrane pressure difference when the ultrafiltration system operates; acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period; and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result. Therefore, the accurate addition of the flocculating agent is realized, the stable operation of an ultrafiltration system is ensured, and the energy is saved and the consumption is reduced.
In one possible implementation manner of the disclosure, the real-time transmembrane pressure difference is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and lasts for a preset first time period, and then a flocculant with a preset adding amount is added after the first time period is finished; or acquiring a first transmembrane pressure difference value of a real-time transmembrane pressure difference and a fixed transmembrane pressure difference, acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, acquiring a time difference value between the real-time moment and a target moment, calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a flocculating agent with a preset adding amount after the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period. The preset first ratio threshold is selected and set according to the application scene requirements.
In the disclosed embodiment, the preset number of backwashing times in each chemically reinforced backwashing period is 1, and the maximum allowable transmembrane pressure difference before backwashing is the maximum transmembrane pressure difference before first backwashing.
Specifically, when the ultrafiltration system operates, the initial early stage of filtration is firstly defaulted without adding a flocculating agent, only transmembrane pressure difference is monitored and recorded in the time, when the filtration time reaches the middle stage of filtration, the ultrafiltration operation state is judged by the change of the transmembrane pressure difference, and the adding state of the flocculating agent is adjusted, specifically:
if (1) a real-time transmembrane pressure difference P occursExample 1Maximum allowable transmembrane pressure difference P before first backwashing1Continuously accumulating for a period of time T1(Preset for a first time period), or the occurrence of (2) a real-time transmembrane pressure difference PExample 1At a certain moment in the initial preceding phase of the filtration cycle, the transmembrane pressure difference PSolid 1Linear formula slope (first ratio)
(first ratio threshold) continuously accumulating for a period of time T2(preset second period of time), then from T1Or T2The end time begins to continuously count up the flocculant4(presetting a fourth time period), and counting down and adding until T4(preset fourth period of time) the countdown is complete.
In one possible implementation manner of the disclosure, in the adding of a preset adding amount of the flocculant and the continuous presetting of a fourth time period, the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before the allowable backwashing and is continuously preset for a first time period, and after the first time period is over, the flocculant is added in an increment adding amount; the increment addition amount can be understood as the addition amount which is added by the original initial addition amount and needs to be added, or the addition of the flocculating agent with the preset addition amount and the addition of the flocculating agent with the preset addition amount are continued for a preset fourth time period, the calculated first ratio at the current moment is greater than or equal to the preset first ratio threshold and the addition of the flocculating agent with the increment addition amount is continued for a preset second time period, and the flocculating agent with the increment addition amount is added after the second time period is ended.
In one possible implementation manner of the disclosure, in the adding of the incrementally added flocculating agent and the continuous presetting of the fifth time period, if the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before the allowable backwashing and the continuous presetting of the first time period, the incrementally added flocculating agent is continuously added and the alarm prompt information is sent; or, in the adding of the incrementally added flocculating agent and the continuous preset fifth time period, if the first ratio calculated at the current moment is greater than or equal to the preset first ratio threshold and the continuous preset second time period, continuously adding the incrementally added flocculating agent and sending alarm prompt information; wherein, the sending of the alarm prompt message comprises prompting a user to check whether the running state of the ultrafiltration system or the adding state of the flocculating agent has a fault.
Specifically, continuous T flocculant addition is carried out after (1) or (2) appears4(Preset a fourth period of time) while one of (1) or (2) is still present, then from (1) or (2) condition T1Or T2Starting timing when the end is over, keeping PAC adding and increasing the adding amount by 0.05ppm for continuous T5And (4) adding for a time (a preset fifth time period), wherein one of the conditions of (1) or (2) still occurs in the adding stage, the system does not adjust the adding state of the flocculating agent according to the judgment of (1) or (2) any more, the adding of the flocculating agent is continuously kept, the adding amount is not increased until the filtering period is ended until backwashing, and meanwhile, alarm prompt information is sent, wherein the alarm prompt information is sent and comprises information for prompting a user to check whether the running state of the ultrafiltration system or the adding state of the flocculating agent has a fault.
It is noted that, in other cases, the flocculating agent is not added; and then, during the operation process of the ultrafiltration system in the residual time of the first filtration, the monitoring, recording, judging and operating are repeatedly carried out until the first filtration is finished and the first backwashing is carried out.
In one possible implementation manner of the present disclosure, the preset backwashing frequency in each chemically enhanced backwashing period is greater than 1, the real-time transmembrane pressure difference is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and lasts for a preset first time period, and then a preset adding amount of flocculant is added after the first time period is over; or acquiring a first transmembrane pressure difference value of a real-time transmembrane pressure difference and a fixed transmembrane pressure difference, acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, acquiring a time difference value between the real-time moment and a target moment, calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a flocculating agent with a preset adding amount after the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period; or acquiring historical real-time transmembrane pressure difference and historical fixed transmembrane pressure difference at the same moment in the previous filtering period, acquiring a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference and acquiring a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference, calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a preset adding amount of flocculant after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period; and the preset second ratio threshold is selected and set according to the application scene requirement.
Specifically, the process is the same for the Nth time (1 < N.ltoreq.M), but P is obtained for the Nth filtrationTrue NAnd PNAnd when the time reaches the middle stage of filtration, judging the ultrafiltration running state by the change of transmembrane pressure difference, specifically:
if (1) a real-time transmembrane pressure difference P occursTrue NMaximum value P of transmembrane pressure difference before allowable backwashing for Nth timeNContinuously accumulating for a period of time T1(Preset for a first time period), or the occurrence of (2) a real-time transmembrane pressure difference PTrue NAt a certain moment in the initial preceding phase of the filtration cycle, the transmembrane pressure difference PFixed NLinear formula slope (first ratio)
(first ratio threshold) continuously accumulating for a period of time T2(Preset second time period), or occurrence of (3) (second ratio)
(second ratio threshold) continuously accumulating for a period of time T3(preset third time period), then from T1Or T2Or T3The end time begins to continuously count up the flocculant4(presetting a fourth time period), and counting down and adding until T4(preset fourth period of time) the countdown is complete.
In one possible implementation manner of the disclosure, in the adding of a preset adding amount of the flocculant and the continuous presetting of a fourth time period, the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before the allowable backwashing and is continuously preset for a first time period, and after the first time period is over, the flocculant is added in an increment adding amount; the increment adding amount is larger than the preset adding amount, or the first ratio calculated at the current moment is larger than or equal to the preset first ratio threshold value and lasts for the preset second time period when the flocculating agent with the preset adding amount is added and lasts for the preset fourth time period, the flocculating agent with the increment adding amount is added after the second time period is ended, or the second ratio calculated at the current moment is larger than or equal to the preset second ratio threshold value and lasts for the preset third time period when the flocculating agent with the preset adding amount is added and lasts for the preset fourth time period, and the flocculating agent with the increment adding amount is added after the third time period is ended.
In one possible implementation manner of the disclosure, in the adding of the flocculating agent with the increment adding amount and the continuous presetting of the fifth time period, if the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before the allowable backwashing and the continuous presetting of the first time period, the flocculating agent with the increment adding amount is continuously added and the alarm prompt information is sent; or, in the adding of the incrementally added flocculating agent and the continuous preset fifth time period, if the first ratio calculated at the current moment is greater than or equal to the preset first ratio threshold and the continuous preset second time period, continuously adding the incrementally added flocculating agent and sending alarm prompt information; or, in the adding of the incrementally added flocculating agent and the continuous preset fifth time period, if the second ratio calculated at the current moment is greater than or equal to the preset second ratio threshold value and the continuous preset third time period, the incrementally added flocculating agent is continuously added and alarm prompt information is sent.
Specifically, in the above case, the flocculant addition is carried out for continuous T after the occurrence of (1) or (2) or (3)4(preset fourth period of time) while one of the conditions (1), (2) or (3) still occurs, then T is the condition from (1), (2) or (3)1Or T2Or T3Timing is started when the end is over, PAC adding is kept and increasedContinuous T at a feed rate of 0.05ppm5And (4) adding for a preset fifth time period, wherein one of the conditions (1), (2) and (3) still occurs in the adding stage, the system does not judge to adjust the PAC adding state according to the conditions (1), (2) and (3) and continuously keeps adding the flocculating agent, but does not increase the adding amount until the filtering period is ended until backwashing, and simultaneously alarms to prompt operators to check whether the operating state of the ultrafiltration system or the flocculating agent adding state is faulty or not.
It is noted that, in other cases, the flocculating agent is not added; and then, in the running process of the residual filtering time of the ultrafiltration system, the monitoring, recording, judging and running are repeatedly carried out until the filtration is finished and the backwashing is finished.
In one possible implementation of the present disclosure, the incoming water temperature and incoming water turbidity is obtained; and adjusting the adding amount of the flocculating agent according to the temperature or turbidity of the incoming water.
Specifically, in the ultrafiltration operation process, the adding amount is complementarily adjusted according to the temperature and the turbidity of the incoming water. The adjustment is as follows: the stage adjustment value is set according to the change of the temperature or the turbidity of the incoming water, and the dosage of the medicament is correspondingly supplemented and adjusted every time the temperature or the turbidity of the incoming water changes in the stage.
More specifically, the temperature of the incoming water is divided into low temperature, medium temperature and high temperature, the turbidity is set to low turbidity, medium turbidity and high turbidity, and the amount of the feed is adjusted to 0.025ppm for each adjacent change every time the temperature or turbidity of the incoming water changes in stages. If the water temperature is changed from low temperature to medium temperature, the water temperature is reduced by 0.025 ppm; if the turbidity goes from low turbidity to medium turbidity, the increase is 0.025 ppm.
In one possible implementation manner of the present disclosure, historical operation data of the ultrafiltration system is obtained, the historical operation data is input into a neural network for training, a training value is obtained, a corresponding physical model is established according to an operation process of the ultrafiltration system, the physical model is solved, a solving value is obtained, a matching degree of the training value and the solving value is calculated, network parameters of the neural network and model parameters of the physical model are adjusted until an error between the matching degree and a preset matching degree threshold value is within a preset error range, and a micro-flocculation ultrafiltration precise dosing control parameter and a weight corresponding to the parameter are determined according to the network parameters of the neural network and the model parameters of the physical model.
Specifically, the deep learning machine model performs learning training according to an existing actual micro-flocculation ultrafiltration dosing engineering database, calculates key factors and corresponding parameters influencing micro-flocculation ultrafiltration, performs simulation test according to the obtained key factors and corresponding parameters to obtain a simulation result matched with actual data, and if the error is within 5%, the deep learning result is considered to be good and can be adopted. If the error is beyond 5%, the artificial adjustment and correction are carried out until the error is within 5%.
Specifically, when deep learning training is carried out, the existing engineering database comprises various water volumes and water quality conditions and various working conditions; and when deep learning training is carried out, the water quality condition in the existing engineering database comprises a front-end process, the temperature and the turbidity of incoming water, and the working condition comprises the flux of an operating membrane, the filtering time, the backwashing time and the chemical strengthening backwashing interval period.
Specifically, when the simulation test is carried out, the adjustment test of single variable or multiple variables can be carried out; when the simulation test is carried out, the step adjustment test of single variable or multiple variables can be carried out; in addition, when the simulation test is performed, the parallelism adjustment test of a single variable or a plurality of variables can be performed.
Through learning training and simulation test correction above, obtain key factor and corresponding parameter that combine original little flocculation ultrafiltration database to influence little flocculation ultrafiltration effect, form the accurate little flocculation of intelligence according to raw water quality of water condition and operating condition and add medicine control mode and method, simultaneously based on above, establish the accurate control model that adds medicine that is fit for a little flocculation, from this, realize the accurate of throwing of little flocculation medicament, guarantee the steady operation of ultrafiltration system and energy saving and consumption reduction.
As an example of a scenario, as shown in fig. 2, deep learning employs a neural network algorithm, and based on an engineering experience historical database, learning and training are performed on a machine, specifically: the historical database is sorted so as to meet the requirement of deep learning data; designing a network structure required by training, and determining the number of layers, hidden nodes and hidden activation functions of each layer, and activation functions and loss functions of output layers; weight initialization, namely performing initialization assignment on a weight parameter w before training so as to determine a training starting point of the network; and (4) network training, namely updating the weight through iterative training to minimize the mean square error, thereby realizing the self-learning effect of the neural network.
The neural network is determined to be two layers, the output function of the hidden layer is a Relu (Rectified Linear Unit), the activation function of the output layer is a Linear liner, the node of the hidden layer is 2000, the loss function is MSE (mean Square error), and a He initialization (He initialization) mode is selected for initialization.
Furthermore, as shown in fig. 2, a CFD computational fluid dynamics platform is selected for the simulation test to construct a simulation system, and the specific process is as follows:
firstly, according to the ultrafiltration operation process, determining the flow state which is in accordance with the ultrafiltration operation process, and establishing a physical model of the ultrafiltration operation process; then, a numerical algorithm is determined and solved. Wherein, the flow state during the ultrafiltration operation is turbulent flow, the porous medium flow model during the filtration is selected, COMSOL Multiphysics finite element simulation software is selected, a moving grid algorithm is introduced, the boundary condition is determined, and then the solution is carried out. And finally, combining respective solutions of deep learning training and simulation test, performing correlation matching, outputting a training value if the matching degree is within 5%, and continuing iterative loop training until the matching degree is within 5%. Therefore, good matching and closed-loop output of deep learning training and simulation test are realized.
Corresponding to the micro-flocculation ultrafiltration precise dosing control method provided in the embodiments of fig. 1 to 2, the present disclosure also provides a micro-flocculation ultrafiltration precise dosing control system, and since the micro-flocculation ultrafiltration precise dosing control system provided in the embodiments of the present disclosure corresponds to the micro-flocculation ultrafiltration precise dosing control method provided in the embodiments of fig. 1 to 2, the embodiment of the micro-flocculation ultrafiltration precise dosing control method is also applicable to the micro-flocculation ultrafiltration precise dosing control system provided in the embodiments of the present disclosure, and will not be described in detail in the embodiments of the present disclosure.
Fig. 3 is a schematic structural diagram of a micro-flocculation ultrafiltration precise dosing control system according to an embodiment of the present disclosure.
As shown in fig. 3, the micro-flocculation ultrafiltration precise dosing control system 300 comprises: a first transmembrane pressure difference acquisition module 301, a second transmembrane pressure difference acquisition module 302 and a calculation processing module 303.
The first transmembrane pressure difference acquisition module 301 is used for acquiring a real-time transmembrane pressure difference when the ultrafiltration system operates.
The second transmembrane pressure difference acquiring module 302 is configured to acquire a fixed transmembrane pressure difference at a target time of a preset initial period in a current filtering cycle and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering cycle.
And the calculation processing module 303 is used for calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add the flocculating agent and adjust the adding amount according to the calculation result.
In an embodiment of the disclosure, the calculation processing module 303 is specifically configured to, if the real-time transmembrane pressure difference is greater than the maximum transmembrane pressure difference before the allowable backwashing and lasts for a preset first time period, add a preset adding amount of the flocculant after the first time period is ended.
In an embodiment of the present disclosure, the calculation processing module 303 is specifically configured to obtain a first transmembrane pressure difference value of a real-time transmembrane pressure difference and a fixed transmembrane pressure difference; acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, and acquiring a time difference value between the real-time moment and a target moment; and calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a flocculating agent with a preset adding amount after the second time period is finished when the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period.
In one embodiment of the disclosure, the preset backwashing number of times in each chemically reinforced backwashing period is 1, and the maximum allowable transmembrane pressure difference before backwashing is the maximum allowable transmembrane pressure difference before first backwashing; and (3) the preset backwashing times in each chemical reinforced backwashing period are more than 1, and the maximum transmembrane pressure difference before the current backwashing time is calculated according to the maximum transmembrane pressure difference before the allowable first backwashing, the maximum transmembrane pressure difference before the allowable maximum backwashing time, the current backwashing time and the maximum backwashing time.
In an embodiment of the disclosure, the number of backwashing times preset in each chemically enhanced backwashing period is greater than 1, and the calculation processing module 303 is specifically configured to obtain a historical real-time transmembrane pressure difference and a historical fixed transmembrane pressure difference at the same time of a previous filtering period; acquiring a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference, and acquiring a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference; and calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a flocculating agent with a preset adding amount after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period.
In one embodiment of the present disclosure, the system further comprises: the adding module is used for adding a preset adding amount of flocculating agent and continuously presetting a fourth time period, wherein the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and continuously presets a first time period, and then adding the flocculating agent with the adding amount increased after the first time period is finished; wherein the increment addition amount is larger than the preset addition amount; or, in the adding of the flocculating agent with the preset adding amount and the continuous preset fourth time period, if the first ratio calculated at the current moment is greater than or equal to the preset first ratio threshold and the second time period is continuous, adding the flocculating agent with the increment adding amount after the second time period is finished; or, in the adding of the flocculant with the preset adding amount and the continuous preset fourth time period, the second ratio calculated at the current moment is greater than or equal to the preset second ratio threshold and the continuous preset third time period, and after the third time period is finished, the flocculant with the increment adding amount is added.
In one embodiment of the present disclosure, the system further comprises: the prompting module is used for continuing to add the flocculating agent with the increment adding amount and sending alarm prompting information when the real-time transmembrane pressure difference at the current moment is larger than the maximum value of the transmembrane pressure difference before allowable backwashing and continues for a preset first time period in the fifth time period continuously after the flocculating agent with the increment adding amount is added; or, in the adding of the incrementally added flocculating agent and the continuous preset fifth time period, if the first ratio calculated at the current moment is greater than or equal to the preset first ratio threshold and the continuous preset second time period, continuously adding the incrementally added flocculating agent and sending alarm prompt information; or, in the adding of the incrementally added flocculating agent and the continuous preset fifth time period, if the second ratio calculated at the current moment is greater than or equal to the preset second ratio threshold value and the continuous preset third time period, continuously adding the incrementally added flocculating agent and sending alarm prompt information; wherein, the sending of the alarm prompt message comprises prompting a user to check whether the running state of the ultrafiltration system or the adding state of the flocculating agent has a fault.
In one embodiment of the present disclosure, the system further comprises: the adjusting module is used for acquiring the water temperature and the turbidity of the incoming water; and adjusting the adding amount of the flocculating agent according to the temperature or turbidity of the incoming water.
In one embodiment of the present disclosure, the system further comprises: the training simulation module is used for acquiring historical operating data of the ultrafiltration system; inputting historical operation data into a neural network for training to obtain a training value; establishing a corresponding physical model according to the running process of the ultrafiltration system, and solving the physical model to obtain a solved value; calculating the matching degree of the training value and the solving value, and adjusting the network parameters of the neural network and the model parameters of the physical model until the error between the matching degree and a preset matching degree threshold value is within a preset error range; and determining a micro-flocculation ultrafiltration precise dosing control parameter and a weight corresponding to the parameter according to the network parameter of the neural network and the model parameter of the physical model.
In summary, the micro-flocculation ultrafiltration precise dosing control system disclosed by the invention obtains the real-time transmembrane pressure difference when the ultrafiltration system operates; acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period; and calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the transmembrane pressure difference before allowable backwashing, and determining whether to add the flocculating agent or not and adjust the adding amount according to the calculation result. Therefore, the accurate addition of the flocculating agent is realized, the stable operation of an ultrafiltration system is ensured, and the energy is saved and the consumption is reduced.
The present disclosure further provides an ultrafiltration system, as shown in fig. 4, the ultrafiltration system includes a water supply system 100, an ultrafiltration membrane module 200, the micro-flocculation ultrafiltration precise dosing control system 300, the water production system 400, the cleaning system 500, the micro-flocculation dosing system 600, and the program control system 700 described in the foregoing embodiment.
Wherein, the water supply system 100 is used for providing the required water inlet and pressure for the ultrafiltration operation.
And the ultrafiltration membrane group 200 is used for performing solid-liquid separation on raw water, intercepting pollutants and producing clear water.
A water production system 400 for providing storage or drainage for the water produced by the ultrafiltration system.
A cleaning system 500 for providing maintenance cleaning and recovery cleaning to the ultrafiltration system, removing trapped contaminants, and recovering its initial filtration performance.
And the micro-flocculation dosing system 600 is used for providing synchronous dosing of the water inlet end on-line flocculating agent for ultrafiltration filtration.
And the micro-flocculation ultrafiltration precise dosing control system 300 is used for controlling precise dosing of the flocculating agent.
And the program control system 700 is used for providing full-automatic control continuous operation for the operation of the ultrafiltration system, and synchronously monitoring, observing and feeding back corresponding operation data or states and faults or alarms.
As an example of a scenario, as shown in FIG. 5, an ultrafiltration system for accurately controlling drug addition is a micro-flocculation ultrafiltration accurate drug addition control system that is externally connected or embedded on the basis of drug addition of a conventional micro-flocculation ultrafiltration system. Conventional micro-flocculation ultrafiltration systems comprise: a water supply system, an ultrafiltration membrane group, a water production system, a cleaning system, a micro-flocculation dosing system and a program control system.
Wherein, the water supply system provides the required water inlet and pressure for the ultrafiltration operation; the ultrafiltration membrane group is the core of the ultrafiltration system, and is used for carrying out solid-liquid separation on raw water, intercepting pollutants and producing clear water; the water production system provides storage or drainage direction for the water produced by the ultrafiltration system; the cleaning system provides maintenance cleaning and recovery cleaning for the ultrafiltration system, removes the trapped pollutants and recovers the initial filtration performance of the ultrafiltration system; the micro-flocculation dosing system provides synchronous dosing of the flocculating agent on line at the water inlet end for ultrafiltration; the program control system provides full-automatic control continuous operation for the operation of the ultrafiltration system, and synchronously monitors, observes and feeds back corresponding operation data or states and faults or alarms.
Thus, simulation test correction is performed simultaneously based on machine deep learning. The method and the device construct a micro-flocculation accurate dosing control mode and method which are convenient to realize and can ensure the stable operation of an ultrafiltration system while obtaining key factors and corresponding parameters which influence the micro-flocculation ultrafiltration. Compared with the original dosing system, the control is more accurate and stable, so that the medicament consumption is reduced, and the energy conservation and consumption reduction are realized.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A micro-flocculation ultrafiltration precise dosing control method is characterized by comprising the following steps:
when the ultrafiltration system operates, acquiring a real-time transmembrane pressure difference;
acquiring a fixed transmembrane pressure difference of a target moment of a preset initial period in a current filtering period and a preset maximum value of an allowable transmembrane pressure difference before backwashing corresponding to the current filtering period;
calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing, and determining whether to add a flocculating agent and adjust the adding amount according to the calculation result;
wherein, the calculation is carried out according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the allowable transmembrane pressure difference before backwashing, and whether the addition of the flocculating agent and the adjustment of the addition amount are carried out or not are determined according to the calculation result, and the method comprises the following steps:
acquiring a first transmembrane pressure difference value of the real-time transmembrane pressure difference and the fixed transmembrane pressure difference; acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, and acquiring a time difference value between the real-time moment and the target moment; calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a preset adding amount of the flocculating agent after the second time period is ended when the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period; or the like, or, alternatively,
the preset backwashing times in each chemical reinforced backwashing period are more than 1, and the historical real-time transmembrane pressure difference and the historical fixed transmembrane pressure difference at the same moment of the previous filtering period are obtained; obtaining a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference, and obtaining a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference; and calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a preset adding amount of the flocculating agent after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period.
2. The method for controlling precise dosing of micro-flocculation ultrafiltration according to claim 1, further comprising:
adding a preset adding amount of the flocculating agent and continuously presetting a fourth time period, wherein the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and continuously presetting a first time period, and adding the flocculating agent with an increment adding amount after the preset first time period is finished; wherein the increment addition amount is larger than the preset addition amount; or the like, or, alternatively,
when a preset adding amount of the flocculating agent is added and a preset fourth time period continues, if the first ratio calculated at the current moment is greater than or equal to a preset first ratio threshold and continues for a preset second time period, adding the flocculating agent with the increment adding amount after the preset second time period is finished; or the like, or, alternatively,
and in the adding of the flocculant with the preset adding amount and the continuous preset fourth time period, the second ratio calculated at the current moment is more than or equal to the preset second ratio threshold value and the continuous preset third time period, and then the flocculant with the increment adding amount is added after the preset third time period is finished.
3. The method for controlling precise dosing of micro-flocculation ultrafiltration according to claim 2, further comprising:
continuously adding the flocculating agent with the increment adding amount and continuously presetting a fifth time period, wherein the real-time transmembrane pressure difference at the current moment is greater than the maximum value of the transmembrane pressure difference before allowable backwashing and continuously presetting the first time period, and then continuously adding the flocculating agent with the increment adding amount and sending alarm prompt information; or the like, or, alternatively,
continuously adding the flocculating agent with the increment addition amount and sending alarm prompt information when a first ratio calculated at the current moment is greater than or equal to a preset first ratio threshold value and is continuously preset for a second time period in a fifth time period continuously preset by adding the flocculating agent with the increment addition amount; or the like, or, alternatively,
continuously adding the flocculating agent with the increment addition amount and sending alarm prompt information when a second ratio calculated at the current moment is greater than or equal to a preset second ratio threshold value and is continuously preset for a third time period in the adding of the flocculating agent with the increment addition amount and the fifth time period;
and sending alarm prompt information, wherein the alarm prompt information comprises information for prompting a user to check whether the running state of the ultrafiltration system or the adding state of the flocculating agent has a fault.
4. The method for controlling precise dosing of micro-flocculation ultrafiltration according to claim 1, further comprising:
obtaining the water temperature and the turbidity of the incoming water;
and adjusting the adding amount of the flocculating agent according to the temperature or turbidity of the incoming water.
5. The method for controlling precise dosing of micro-flocculation ultrafiltration according to claim 1, further comprising:
acquiring historical operating data of the ultrafiltration system;
inputting the historical operation data into a neural network for training to obtain a training value;
establishing a corresponding physical model according to the running process of the ultrafiltration system, and solving the physical model to obtain a solved value;
calculating the matching degree of the training value and the solving value, and adjusting the network parameters of the neural network and the model parameters of the physical model until the error between the matching degree and a preset matching degree threshold value is within a preset error range;
and determining a micro-flocculation ultrafiltration precise dosing control parameter and a weight corresponding to the parameter according to the network parameter of the neural network and the model parameter of the physical model.
6. The utility model provides a little accurate medicine control system that adds of flocculation ultrafiltration which characterized in that includes:
the first transmembrane pressure difference acquisition module is used for acquiring real-time transmembrane pressure difference when the ultrafiltration system operates;
the second transmembrane pressure difference acquisition module is used for acquiring a fixed transmembrane pressure difference at a target moment of a preset initial period in a current filtering period and a preset maximum value of a transmembrane pressure difference before backwashing, which corresponds to the current filtering period;
the calculation processing module is used for calculating according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum allowable transmembrane pressure difference before backwashing and determining whether to add the flocculating agent and adjust the adding amount according to the calculation result;
wherein, the calculation is carried out according to the real-time transmembrane pressure difference and the fixed transmembrane pressure difference or the maximum value of the allowable transmembrane pressure difference before backwashing, and whether the addition of the flocculating agent and the adjustment of the addition amount are carried out or not are determined according to the calculation result, and the method comprises the following steps:
acquiring a first transmembrane pressure difference value of the real-time transmembrane pressure difference and the fixed transmembrane pressure difference; acquiring a real-time moment corresponding to the real-time transmembrane pressure difference, and acquiring a time difference value between the real-time moment and the target moment; calculating a first ratio of the first transmembrane pressure difference value to the time difference value, and adding a preset adding amount of the flocculating agent after the second time period is ended when the first ratio is greater than or equal to a preset first ratio threshold value and lasts for a preset second time period; or the like, or, alternatively,
when the preset backwashing times in each chemical enhanced backwashing period are more than 1, acquiring the historical real-time transmembrane pressure difference and the historical fixed transmembrane pressure difference at the same time of the previous filtering period; obtaining a second transmembrane pressure difference value of the real-time transmembrane pressure difference and the historical real-time transmembrane pressure difference, and obtaining a third transmembrane pressure difference value of the fixed transmembrane pressure difference and the historical fixed transmembrane pressure difference; and calculating a second ratio of the second transmembrane pressure difference value to the third transmembrane pressure difference value, and adding a preset adding amount of the flocculating agent after the third time period is ended when the second ratio is greater than or equal to a preset second ratio threshold value and lasts for a preset third time period.
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