CN112441654A - Control system and method suitable for coagulating sedimentation - Google Patents
Control system and method suitable for coagulating sedimentation Download PDFInfo
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- CN112441654A CN112441654A CN202011201334.7A CN202011201334A CN112441654A CN 112441654 A CN112441654 A CN 112441654A CN 202011201334 A CN202011201334 A CN 202011201334A CN 112441654 A CN112441654 A CN 112441654A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/194—Segmentation; Edge detection involving foreground-background segmentation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
Abstract
The invention discloses a control system and a control method suitable for coagulating sedimentation.A device corresponding to the invention is characterized in that polluted raw water sequentially passes through a PAC (polyaluminium chloride) mixing tank, a PAM (polyacrylamide) mixing tank, a flocculation tank and a sedimentation tank, images of suspended particles of the polluted raw water are monitored by a high-definition camera, images of alum flocs in the flocculation tank are collected, the outline of the alum flocs is extracted, and the overall distribution and the shape condition of current underwater alum flocs are determined according to the calculated outline area, perimeter and equivalent diameter of the alum flocs. The current state of the underwater alum blossom can be intuitively known, the operation effect can be judged, and the subsequent dosing adjustment is convenient; meanwhile, the device has low requirement on the use environment, continuously collects and identifies the state of alum floc in water in real time, reduces the labor investment, reduces the labor intensity and the cost, can effectively realize the flocculation and precipitation effect of raw water, has high efficiency, is full-automatic, contributes to standard management and saves energy.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a control system and method suitable for coagulating sedimentation.
Background
With the recent continuous development of industry, sewage treatment is an urgent problem to be solved, and among various methods for sewage treatment, coagulation sedimentation is a method frequently used. The coagulating sedimentation process is a process of adding a proper amount of coagulant into water, destroying the stability of colloidal particles and fine suspended matters in the water to enable the colloidal particles and the fine suspended matters to agglomerate, forming flocculating constituents (generally called alum flocs in water treatment) under the catching action of the flocculating constituents and certain hydraulic conditions, and separating the flocculating constituents from the water, wherein impurities removed by coagulating sedimentation mainly comprise suspended matters and colloidal particles. In water treatment, coagulation is the most critical factor affecting the treatment effect. The coagulation can not only make colloid and fine suspended matter in suspension agglomerate into particles which are easy to precipitate and separate, but also can partially remove chromaticity, inorganic pollutants, organic pollutants and colloid complex formed by iron and manganese. Meanwhile, some radioactive substances, plankton and algae can be removed. The quality of the reaction effect is directly related to the effluent quality and the treatment cost, and the treatment of tap water, domestic sewage and various industrial wastewater is required to be applied to the coagulating sedimentation process.
The dosage of the conventional coagulating sedimentation operation medicament needs to be determined by a coagulating stirring test every shift, and the dosage is determined by taking the mixing stirring strength and the velocity gradient G value as fixed values. Therefore, the conventional coagulating sedimentation operation control mode has the problems of non-intuitive data, difficult and accurate control of the dosing amount, unstable treatment effect, complicated steps, low efficiency and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control system and a control method which have intuitive and visible data, accurate and specific dosing amount, obvious effect, high efficiency, can automatically realize flocculation and ensure the effluent quality and are suitable for coagulating sedimentation.
In order to solve the technical problems, the technical solution of the invention is as follows:
a control system adapted for use in coagulation sedimentation comprising in sequence: PAC mixes pond, PAM and mixes pond, flocculation basin, sedimentation tank and switch board, PAC mix the pond and be provided with PAC in the flocculation basin respectively and mix pond high definition digtal camera and flocculation basin high definition digtal camera, PAC mix pond, PAM and mix the pond and be provided with PAC in the flocculation basin respectively and mix pond mixer, PAM mixes pond mixer and flocculation basin mixer, PAC mix the pond upper end and connect the PAC medicament storage tank, PAM mix the pond upper end and connect PAM dosing system, the switch board in be provided with the controller, the controller connect PAC and mix pond high definition digtal camera, flocculation basin high definition digtal camera, PAC and mix pond mixer, PAM and mix pond mixer, flocculation basin mixer, PAC medicament storage tank and PAM dosing system.
Further, the PAC medicament storage tank on be provided with the PAC measuring pump, PAM dosing system on be provided with the PAM measuring pump, the controller connect PAC measuring pump and PAM measuring pump.
Further, PAM dosing system include solution tank, dry powder feed arrangement and wetting device, the solution tank constitute by dissolving medical kit, curing case and liquid reserve tank, dry powder feed arrangement constitute by broken motor that encircles, feeding motor, feed inlet heater, material level alarm sensor and stainless steel frame, wetting device constitute by solenoid valve, flowmeter and wetting device.
Furthermore, the PAM dosing system also comprises a sleeve component device for water inlet and liquid outlet, a liquid level meter for liquid level control, three groups of electric stirrers for stirring and a bracket for connecting other devices.
Furthermore, the bracket is made of stainless steel or polypropylene.
Furthermore, the sedimentation tank is provided with a water outlet turbidimeter which is connected with the controller.
Further, the PAC mixing tank high-definition camera and the flocculation tank high-definition camera comprise an image acquisition module for acquiring an alum blossom image and an image identification module for preprocessing the alum blossom image, wherein the image identification module is connected with the image acquisition module, and the image identification module is connected with the controller.
A control method suitable for coagulating sedimentation comprises the following steps:
(1) adding raw water into a PAC mixing tank through a water pump, monitoring the particle size and the number of suspended particles of the raw water through a high-definition camera of the PAC mixing tank, acquiring images of the suspended particles through an image acquisition module, preprocessing video images through an image identification module, and transmitting preprocessed signals to a controller;
(2) adding PAC into raw water of a PAC mixing tank, mixing, then entering a PAM mixing tank, adding PAM into the PAM mixing tank, mixing, and then entering a flocculation tank;
(3) the flocculation tank high-definition camera monitors alum blossom images in the flocculation tank, the image acquisition module acquires the alum blossom images, the image recognition module preprocesses the alum blossom images, and then a preprocessed signal is transmitted to the controller;
(4) the controller extracts an alum blossom outline, calculates area, perimeter and equivalent radius of the alum blossom outline, and draws the overall distribution and shape condition of the current underwater alum blossom through the calculated area, perimeter and equivalent diameter of the alum blossom outline;
(5) the controller controls the operation of the PAC metering pump and the PAC mixing tank stirrer through analysis data obtained from the image provided by the high-definition camera of the mixing tank, and controls the operation of the PAM feeding system, the PAM metering pump, the PAM mixing tank stirrer and the flocculation tank stirrer through analysis data obtained from the image provided by the high-definition camera of the flocculation tank;
(6) and water in the flocculation tank is precipitated in the sedimentation tank and then is discharged, so that the raw water coagulation sedimentation is completed.
Further, the image recognition module in step (1) and step (3) pre-processes the image by:
(11) reading video image data acquired by an image acquisition module;
(12) intercepting image data in the video data as an original image;
(13) carrying out contrast-limiting adaptive histogram threshold equalization on the original image, and redistributing the brightness value of the image by calculating the histogram of each salient region of the image;
(14) adjusting the brightness of the image, and performing self-adaptive binarization;
(15) extracting the original water suspended matter particles or the alum blossom outlines, realizing the segmentation of the original water suspended matter particles or alum blossom outline images and the water background, and finishing the image pretreatment.
Further, PAC measuring pump and PAM measuring pump select for use ECC electronic stroke control measuring pump, PAC measuring pump and PAM measuring pump digital display in the controller, PAC mix pond mixer, PAM mix pond mixer and flocculation basin mixer select for use inverter motor, these four indexes of rotational speed, power, speed gradient G value are digital display in the controller.
The invention has the beneficial effects that:
1. according to the device, polluted raw water sequentially passes through a PAC mixing tank, a PAM mixing tank, a flocculation tank and a sedimentation tank, a PAC mixing tank high-definition camera arranged on the PAC mixing tank is used for monitoring suspended particle images of the polluted raw water, a controller is used for analyzing the suspended particle images, the controller is used for controlling the PAC metering pump and a PAC mixing tank stirrer to operate according to the analysis result, so that the hydrolysis and polymerization effects of the raw water in the PAC mixing tank are effectively controlled, the dosage and the stirring duration are effectively controlled, the flocculation tank high-definition camera is used for monitoring alum blossom images in the flocculation tank, the controller is used for driving and controlling a PAM system, the PAM metering pump, the PAM mixing tank stirrer and the flocculation tank stirrer to operate after the alum blossom images are analyzed, so that the hydrolysis and polymerization effects in the PAM tank are realized, the PAM feeding is controlled, and the integral parameter data are obtained, the device comprises the dosage, the coagulation control index speed gradient G value, the effluent turbidity and the like which are all displayed by a controller, the data is visual and visible, the original manual identification and manual decision feeding process are replaced, the dosage is accurate and specific, the flocculation and precipitation effect of raw water can be effectively realized, the efficiency is high, the whole process is automatic and practical, the standard management is facilitated, and the energy is saved;
2. according to the method, raw water is added into the device corresponding to the method, the controller of the device controls the operation of the PAC metering pump and the PAC mixing tank stirrer through analysis data obtained from the image provided by the high-definition camera of the mixing tank, and the controller controls the operation of the PAM feeding system, the PAM metering pump, the PAM mixing tank stirrer and the flocculation tank stirrer through analysis data obtained from the image provided by the high-definition camera of the flocculation tank, so that full automation of flocculation precipitation is realized, the flocculation effect is good, and the efficiency is high;
3. according to the method, the image is preprocessed through the image recognition module, the original image is subjected to adaptive histogram threshold equalization for limiting contrast, the original water suspended particle or alumen ustum outline image and the water background are segmented by calculating the histogram of each significant region of the image and redistributing the brightness value of the image, the current water quality state can be judged by the controller, accurate dosing, stirring and other judgments can be made according to the water quality state, and the accuracy is high.
Drawings
FIG. 1 is a schematic diagram of the structure of a corresponding system of the present invention;
FIG. 2 is a schematic structural diagram of a PAM dosing system according to the present invention;
in the figure: 1-PAC mixing tank; 2-PAM mixing pool; 3-a flocculation tank; 4-a sedimentation tank; 5-PAC mixing pool high definition camera; 6-flocculating tank high-definition camera; 7-PAC medicament storage tank; 8-PAC metering pump; 9-PAM feeding system; 10-PAM metering pump; 11-PAC mixing tank blender; 12-PAM mixing tank stirrer; 13-flocculation tank mixer; 14-effluent turbidimeter; 15-a control cabinet; 16-a dry powder feed device; 17-a wetting device; 18-a solution tank; 19-a curing box; 20-a liquid storage tank; 21-a liquid level meter; 22-a stirrer;
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be noted that the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problems of inaccurate dosing amount, unobvious effect and low efficiency caused by manual dosing of the existing flocculation precipitation device or method, the application discloses a control system suitable for coagulation precipitation, as shown in fig. 1 and fig. 2, comprising the following steps in sequence:
PAC mixes pond 1, PAM and mixes pond 2, flocculation basin 3, sedimentation tank 4 and switch board 15, PAC mix and be provided with PAC in pond 1 and the flocculation basin 3 respectively and mix pond high definition digtal camera 5 and flocculation basin high definition digtal camera 6, PAC mix and be provided with PAC in pond 1, PAM mix pond 2 and the flocculation basin 3 respectively and mix pond mixer 11, PAM mix pond mixer 12 and flocculation basin mixer 13, PAC mix 1 upper end connection PAC medicament storage tank 7 in the pond, 2 upper ends connection PAM dosing system 9 in the PAM mix pond, switch board 15 in be provided with the controller, the controller connect PAC and mix pond high definition digtal camera 5, flocculation basin high definition digtal camera 6, PAC and mix pond mixer 11, PAM mix pond mixer 12, flocculation basin mixer 13, PAC medicament storage tank 7 and PAM dosing system 9.
Preferably, the PAC reagent storage tank 7 is provided with a PAC metering pump 8, the PAC metering pump 8 is used for controlling the PAC reagent storage tank 7 to add medicine into the PAC mixing tank 1, PAC is short for polyaluminium chloride, and the PAC mixing tank 1 is used for mixing raw water and polyaluminium chloride to realize pre-preparation of flocculation precipitation. PAM dosing system 9 on be provided with PAM measuring pump 10, PAM measuring pump 10 effect realizes PAM dosing system 9 and puts in PAM in to PAM mixing tank 2, wherein, the controller connect PAC measuring pump 8 and PAM measuring pump 10. I.e. both the PAC dosing pump 8 and the PAM dosing pump 10 can be automatically controlled by the controller.
Preferably, the PAM feeding system 9 comprises a solution tank 18, a dry powder feeding device 16 and a wetting device 17, wherein the solution tank 18 comprises a dissolving tank, a curing tank 19 and a liquid storage tank 20, the dry powder feeding device 16 comprises an arch breaking motor, a feeding port heater, a material level alarm sensor and a stainless steel frame, and the wetting device 17 comprises an electromagnetic valve, a flowmeter and a wetting device. PAM is polyacrylamide for short, a PAM adding system 9 is an existing polyacrylamide configuration system, PAM configuration is carried out according to the requirements of a PAM mixing tank 2, specifically, a solution tank 18 is matched with a dry powder feeding device 16 to realize medicament mixing and complete medicament configuration, the medicament is different according to different raw water, and the required effect is specifically seen to obtain polyacrylamide solutions with different concentrations. Preferably, the PAM dosing system 9 further comprises a casing component device for inlet and outlet liquid, a liquid level meter 21 for liquid level control, three groups of electric stirrers 22 for stirring and a bracket for connecting other devices. Preferably, the bracket is made of stainless steel or polypropylene.
Preferably, the sedimentation tank 4 is provided with an effluent turbidimeter 14, and the effluent turbidimeter 14 is connected with a controller. The turbidity of water can be effectually judged to go out water turbidity meter 14, and this go out water turbidity also directly embodies on the controller with the form of digit in addition, and is directly perceived visible, can effectually judge the effect of flocculation and precipitation through going out water turbidity, and it is lower to go out water turbidity, and the effect is better.
Preferably, the PAC mixing pool high definition camera 5 and the flocculation tank high definition camera 6 include an image acquisition module for acquiring an alum blossom image and an image recognition module for preprocessing the alum blossom image, the image recognition module is connected with the image acquisition module, and the image recognition module is connected with the controller. The image identification module receives the data of the image acquisition module, and controls the operation of the PAC mixing tank stirrer 11, the PAM mixing tank stirrer 12, the flocculation tank stirrer 13, the PAC medicament storage tank 7 and the PAM adding system 9 through the controller after analysis. The high definition digtal camera that this application corresponds is camera under water, and it has waterproof function, and its camera lens tight shot, pixel are more than or equal to 1000 ten thousand.
The first two stages of the precipitation flocculation are mixing stages, namely a PAC mixing stage and a PAM mixing stage which are respectively carried out in a PAC mixing tank 1 and a PAM mixing tank 2, and the stages mainly enable corresponding medicaments to be rapidly and uniformly dispersed in water so as to be beneficial to rapid hydrolysis, polymerization and particle destabilization of a coagulant. The PAC mixing tank stirrer 11 and the PAM mixing tank stirrer 12 are used for adjusting stirring intensity and further accelerating hydrolysis and polymerization, the PAC mixing tank stirrer 11 and the PAM mixing tank stirrer 12 can also be controlled by a controller, the stirring intensity is controlled according to a speed gradient G, the general speed gradient G is within 700-1000 s < -1 >, the speed gradient G is directly displayed in the controller, and the current intensity can be visually seen so as to be adjusted.
Specifically, the controller of this application controls PAC measuring pump 8 and the operation of PAC mixing tank mixer 11 through the analytical data that the image that mixing tank high definition digtal camera provided reachs, and the controller controls PAM dosing system 9, PAM measuring pump 10, PAM mixing tank mixer 12 and flocculation tank mixer 13 through the analytical data control that the image that flocculation tank high definition digtal camera 6 provided reachs and moves. The specific adjustment principle is that firstly, a PAC (programmable automation controller) mixing pool high-definition camera 5 monitors the particle size and the number of raw water suspended particles, an image acquisition module acquires images of the suspended particles, an image recognition module preprocesses video images, and then preprocessed signals are transmitted to a controller, wherein the preprocessing process includes that the raw images are subjected to adaptive histogram threshold equalization for limiting contrast, and the luminance values of the images are redistributed by calculating histograms of all significant areas of the images, so that the raw water suspended particles or alum blossom outline images and water background are segmented, and the image preprocessing is completed. After the pretreatment is finished, the controller realizes control through the collected image, when the raw water suspended particle image is in a mixing stage, the controller preliminarily judges the raw water suspended particle image, firstly, the controller can systematically learn various controllers in advance, namely machine learning is carried out, then the learned image is compared with the image collected by the image collecting module so as to carry out matching, the machine-learned image is provided with optimal parameter values, for example, the machine learns the 100 raw water suspended particle images or the alum flower contour images, the 100 corresponding parameters such as the medicine adding quantity parameter, the coagulation control index, the speed gradient G value, the effluent turbidity and the like have a determined value, the value can be understood as the optimal solution of the system for adjusting the turbidity raw water, and the optimal solution can be obtained through the experience of peopleAnd long-term experiments. Taking the flocculation stage as an example, the flocculation stage mainly depends on mechanical or hydraulic stirring to promote the collision and aggregation of particles, and takes cocurrent flocculation as the main. The intensity of the agitated water body is expressed in the magnitude of the velocity gradient G value. Taking into account the flocculation time (i.e.the particle residence time) T, hence TN0Namely the number of particle collisions in the unit volume of water in the whole flocculation time. Since N0 is related to the G value, the G value and GT value are used as control indexes in the flocculation stage. During flocculation, the floc size gradually increases. Since large flocs are easily broken, the G value should be gradually decreased from the beginning to the end of the flocculation. Flocculation stage, average G is 20-70-1SIn the range of 1x10 on average4～1x105Within the range. Therefore, for the flocculation stage, the G value and the GT value are used as control indexes, and the size of the flocculation stage is determined according to different images, wherein the average G is 20-70-1SIn the range of 1x10 on average4～1x105In the range, the flocculation tank high-definition camera 6 is used for monitoring the alum blossom images in the flocculation tank 3 in the operation process, extracting the alum blossom outline, and determining the total distribution and the form condition of the current underwater alum blossom according to the calculated area, perimeter and equivalent diameter of the alum blossom outline. The overall distribution and the form condition of the current underwater alum blossom can be directly, clearly and accurately known through a calculation result, and the flocculation precipitation effect is monitored, so that the dosage and the rotating speed of a flocculation tank stirrer 13 are adjusted, the dosage, the G value and the GT value are digitally displayed with the flocculation effect, and the system is in the best operation effect.
After the controller receives the image processed by the image recognition module, the image is compared with the learned image, and after the image is matched with the image, the corresponding control parameters are set to be set values, so that the controller can adjust the current parameters according to the set values, and the PAC metering pump 8, the PAC mixing tank stirrer 11, the PAM feeding system 9, the PAM metering pump 10, the PAM mixing tank stirrer 12 and the flocculation tank stirrer 13 are controlled to operate, wherein the data of the feeding amount comprises the feeding amounts of PAC and PAM, the data correspond to the PAC metering pump 8 and the PAM metering pump 10, the PAM feeding system 9 corresponds to the feeding concentration, the speed gradient G value controls the speed of the stirrer, and the automatic control is realized through the method. Wherein, the utilization goes out water turbidimeter 14 can effective detection effect, and is directly perceived convenient. Holistic data all show through the controller, and its data is directly perceived visible, and moreover, it is accurate concrete to add the dose, can the effectual flocculation and precipitation effect that realizes the raw water, and is efficient.
The invention also discloses a control method suitable for coagulating sedimentation, which comprises the following steps:
(1) adding raw water into a PAC (programmable automation controller) mixing tank 1 through a water pump, monitoring the particle size and the number of suspended particles of the raw water through a high-definition camera 5 of the PAC mixing tank, acquiring images of the suspended particles through an image acquisition module, preprocessing video images through an image identification module, and transmitting preprocessed signals to a controller;
(2) adding PAC into raw water in a PAC mixing tank 1, mixing, then entering a PAM mixing tank 2, adding PAM into the PAM mixing tank 2, mixing, and then entering a flocculation tank 3;
(3) the flocculation tank high-definition camera 6 monitors alum blossom images in the flocculation tank 3, the image acquisition module acquires the alum blossom images, the image recognition module preprocesses the alum blossom images, and then preprocessed signals are transmitted to the controller;
(4) the controller extracts an alum blossom outline, calculates area, perimeter and equivalent radius of the alum blossom outline, and draws the overall distribution and shape condition of the current underwater alum blossom through the calculated area, perimeter and equivalent diameter of the alum blossom outline;
(5) the controller controls the operation of the PAC metering pump 8 and the PAC mixing tank stirrer 11 through analysis data obtained from an image provided by the mixing tank high-definition camera 6, and controls the operation of the PAM feeding system 9, the PAM metering pump 10, the PAM mixing tank stirrer 12 and the flocculation tank stirrer 13 through analysis data obtained from an image provided by the flocculation tank high-definition camera 6;
(6) the water in the flocculation tank 3 is precipitated by the sedimentation tank 4 and then discharged, and the coagulation sedimentation of the raw water is completed.
Preferably, the image recognition module in step (1) and step (3) pre-processes the image by:
(11) reading video image data acquired by an image acquisition module;
(12) intercepting image data in the video data as an original image;
(13) carrying out contrast-limiting adaptive histogram threshold equalization on the original image, and redistributing the brightness value of the image by calculating the histogram of each salient region of the image; by utilizing the redistribution of the brightness, the local contrast of the image is better improved, the edge information of the image is enhanced, and the segmentation is facilitated.
(14) Adjusting the brightness of the image, and performing self-adaptive binarization;
(15) extracting the original water suspended matter particles or the alum blossom outlines, realizing the segmentation of the original water suspended matter particles or alum blossom outline images and the water background, and finishing the image pretreatment.
Preferably, the PAC metering pump 8 and the PAM metering pump 10 are ECC electric stroke control metering pumps, the PAC metering pump 8 and the PAM metering pump 10 are digitally displayed on a controller, the PAC mixing tank stirrer 11, the PAM mixing tank stirrer 12 and the flocculation tank stirrer 13 are variable frequency motors, and the four indexes of the rotating speed, the power and the G value of the speed gradient are digitally displayed on the controller.
According to the method, raw water is added into the device corresponding to the method, the controller of the device controls the operation of the PAC metering pump and the PAC mixing tank stirrer through analysis data obtained from the image provided by the high-definition camera of the mixing tank, and the controller controls the operation of the PAM feeding system, the PAM metering pump, the PAM mixing tank stirrer and the flocculation tank stirrer through analysis data obtained from the image provided by the high-definition camera of the flocculation tank, so that full automation of flocculation precipitation is realized, the flocculation effect is good, and the efficiency is high; the image is preprocessed through the image recognition module, the original image is subjected to self-adaptive histogram threshold equalization for limiting contrast, the original water suspended particle or alum blossom outline image and the water background are segmented by calculating the histogram of each significant region of the image and redistributing the brightness value of the image, the current water quality state can be judged by the controller, so that accurate dosing, stirring and other judgments can be made according to the water quality state, and the accuracy is high.
The above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention, so that the changes and modifications made by the claims and the specification of the present invention should fall within the scope of the present invention.
Claims (10)
1. A control system suitable for coagulating sedimentation, comprising in sequence: PAC mixes pond, PAM and mixes pond, flocculation basin, sedimentation tank and switch board, PAC mix the pond and be provided with PAC in the flocculation basin respectively and mix pond high definition digtal camera and flocculation basin high definition digtal camera, PAC mix pond, PAM and mix the pond and be provided with PAC in the flocculation basin respectively and mix pond mixer, PAM mixes pond mixer and flocculation basin mixer, PAC mix the pond upper end and connect the PAC medicament storage tank, PAM mix the pond upper end and connect PAM dosing system, the switch board in be provided with the controller, the controller connect PAC and mix pond high definition digtal camera, flocculation basin high definition digtal camera, PAC and mix pond mixer, PAM and mix pond mixer, flocculation basin mixer, PAC medicament storage tank and PAM dosing system.
2. A control system for use in coagulating sedimentation according to claim 1, wherein: the PAC medicament storage tank on be provided with the PAC measuring pump, PAM dosing system on be provided with the PAM measuring pump, the controller connect PAC measuring pump and PAM measuring pump.
3. A control system for use in coagulating sedimentation according to claim 1, wherein: the PAM feeding system comprises a solution tank, a dry powder feeding device and a wetting device, wherein the solution tank consists of a dissolving tank, a curing tank and a liquid storage tank, the dry powder feeding device consists of an arch breaking motor, a feeding motor, a feed inlet heater, a material level alarm sensor and a stainless steel frame, and the wetting device consists of an electromagnetic valve, a flowmeter and a wetting device.
4. A control system for use in coagulating sedimentation according to claim 3, wherein: the PAM adding system also comprises a sleeve component device for water inlet and outlet, a liquid level meter for liquid level control, three groups of electric stirrers for stirring and a bracket for connecting other devices.
5. A control system for coagulating sedimentation according to claim 4, wherein: the bracket is made of stainless steel materials or polypropylene materials.
6. A control system for use in coagulating sedimentation according to claim 1, wherein: the sedimentation tank is provided with a water outlet turbidimeter which is connected with a controller.
7. A control system for use in coagulating sedimentation according to claim 1, wherein: the PAC mixing tank high-definition camera and the flocculation tank high-definition camera comprise an image acquisition module for acquiring an alum blossom image and an image identification module for preprocessing the alum blossom image, wherein the image identification module is connected with the image acquisition module, and the image identification module is connected with the controller.
8. A control method suitable for coagulating sedimentation is characterized by comprising the following steps:
(1) adding raw water into a PAC mixing tank through a water pump, monitoring the particle size and the number of suspended particles of the raw water through a high-definition camera of the PAC mixing tank, acquiring images of the suspended particles through an image acquisition module, preprocessing video images through an image identification module, and transmitting preprocessed signals to a controller;
(2) adding PAC into raw water of a PAC mixing tank, mixing, then entering a PAM mixing tank, adding PAM into the PAM mixing tank, mixing, and then entering a flocculation tank;
(3) the flocculation tank high-definition camera monitors alum blossom images in the flocculation tank, the image acquisition module acquires the alum blossom images, the image recognition module preprocesses the alum blossom images, and then a preprocessed signal is transmitted to the controller;
(4) the controller extracts an alum blossom outline, calculates area, perimeter and equivalent radius of the alum blossom outline, and draws the overall distribution and shape condition of the current underwater alum blossom through the calculated area, perimeter and equivalent diameter of the alum blossom outline;
(5) the controller controls the operation of the PAC metering pump and the PAC mixing tank stirrer through analysis data obtained from the image provided by the high-definition camera of the mixing tank, and controls the operation of the PAM feeding system, the PAM metering pump, the PAM mixing tank stirrer and the flocculation tank stirrer through analysis data obtained from the image provided by the high-definition camera of the flocculation tank;
(6) and water in the flocculation tank is precipitated in the sedimentation tank and then is discharged, so that the raw water coagulation sedimentation is completed.
9. The method for controlling the coagulation sedimentation according to claim 8, wherein the image recognition module in the step (1) and the step (3) preprocesses the image by:
(11) reading video image data acquired by an image acquisition module;
(12) intercepting image data in the video data as an original image;
(13) carrying out contrast-limiting adaptive histogram threshold equalization on the original image, and redistributing the brightness value of the image by calculating the histogram of each salient region of the image;
(14) adjusting the brightness of the image, and performing self-adaptive binarization;
(15) extracting the original water suspended matter particles or the alum blossom outlines, realizing the segmentation of the original water suspended matter particles or alum blossom outline images and the water background, and finishing the image pretreatment.
10. The method as claimed in claim 8, wherein the PAC and PAM metering pumps are ECC electric stroke control metering pumps, the PAC and PAM metering pumps are digitally displayed on the controller, the PAC, PAM and flocculation tank mixers are variable frequency motors, and the four indexes of the rotating speed, the power and the G value of the velocity gradient are digitally displayed on the controller.
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