CN-117361806-B - Intelligent treatment system and method for electroplating chromium-containing wastewater

CN117361806BCN 117361806 BCN117361806 BCN 117361806BCN-117361806-B

Abstract

The invention discloses an intelligent treatment system and method for electroplating chromium-containing wastewater, wherein the intelligent treatment system comprises a sensor module, an image acquisition module, an intelligent control center and a module to be controlled, wherein the sensor module is used for acquiring operation data, the operation data comprise pH data and ORP data, the image acquisition module is used for acquiring supernatant image data of a sedimentation tank, the module to be controlled is used for carrying out variable frequency control of a dosing pump when dosing a chromium-breaking tank and/or adding acid or alkali to a pH regulating tank, and the intelligent control center is used for analyzing the received operation data and the image data and sending a control signal to the module to be controlled so as to realize variable frequency control of the module to be controlled. The invention can accurately control the dosage of the reducing agent, thereby saving the dosage of the reducing agent and reducing the subsequent treatment load.

Inventors

LI CUI
YU YUNFEI
ZHENG JIE

Assignees

中冶赛迪工程技术股份有限公司

Dates

Publication Date: 20260508
Application Date: 20231123

Claims (7)

1. An intelligent treatment method of electroplating chromium-containing wastewater is characterized in that an intelligent treatment system of the electroplating chromium-containing wastewater is utilized; The intelligent treatment system for the electroplating chromium-containing wastewater comprises a sensor module, an image acquisition module, an intelligent control center and a module to be controlled; the sensor module is used for collecting operation data, wherein the operation data comprises pH data and ORP data; the image acquisition module is used for acquiring supernatant image data of the sedimentation tank; The module to be controlled is used for carrying out variable frequency control of the dosing pump when dosing the chromium breaking tank and/or when adding acid or alkali to the pH adjusting tank; The intelligent control center is used for analyzing the received operation data and the received image data, sending a control signal to the module to be controlled and realizing the variable frequency control of the module to be controlled; The sensor module comprises a first pH sensor arranged in a primary pH adjusting tank, a second pH sensor arranged in a secondary pH adjusting tank, a first ORP sensor arranged in the primary pH adjusting tank, a second ORP sensor arranged in a primary chromium breaking tank and a third ORP sensor arranged in the secondary chromium breaking tank; the module to be controlled comprises a first dosing pump variable frequency controller arranged in a first-stage chromium breaking tank, a second dosing pump variable frequency controller arranged in a second-stage chromium breaking tank, a first acid-base dosing pump variable frequency controller arranged in a first-stage pH adjusting tank and a second acid-base dosing pump variable frequency controller arranged in a second-stage pH adjusting tank; the intelligent treatment method of the electroplating chromium-containing wastewater comprises the following steps: S1, taking total chromium concentration and hexavalent chromium concentration as target values, taking three-level ORP data and two-level addition amount of a reducing agent as inputs, constructing a prediction model, and predicting the conditions of reaching standards of the total chromium concentration and the hexavalent chromium concentration of supernatant fluid of the sedimentation tank under the changes of the ORP data and the addition amount of the reducing agent; s2, inputting three-level ORP data acquired in real time and the dosing amount of the two-level reducing agent into a prediction model, taking a group which is predicted in the prediction model and enables hexavalent chromium concentration to reach the standard and has the lowest dosing amount as an optimal agent value group, and adjusting the dosing amount of the two-level reducing agent so that the dosing amount is equal to the dosing amount in the optimal agent value group; s3, collecting image data of supernatant fluid of the sedimentation tank, judging whether the water body of the sedimentation tank is turbid according to the image data, if so, predicting the medicine quantity predicted by the prediction model is unsuitable, returning to the step S2 until the image data is fed back to the supernatant fluid of the sedimentation tank to be clear, and if not, waiting for entering the next prediction interval.
2. The intelligent treatment method of the electroplating chromium-containing wastewater according to claim 1, wherein the image acquisition module comprises an underwater industrial camera, an augmentation light source and a photoelectric signal transmission module; The underwater industrial camera is arranged on the upper part of the sedimentation tank, acquires supernatant image data of the sedimentation tank, and is connected with the intelligent control center through the photoelectric signal transmission module to transmit image signals.
3. The intelligent treatment method of the electroplating chromium-containing wastewater according to claim 1, further comprising the steps of a. Before the step S1, adjusting the pH value of the two-stage pH adjusting tank, specifically comprising: the primary pH adjusting tank is set to have a pH value adjusting range of 2.8-3.1, and the secondary pH adjusting tank is set to have a pH value adjusting range of 7.5-8.5.
4. The intelligent treatment method of electroplating chromium-containing wastewater according to claim 3, wherein each time And (3) carrying out feedback adjustment in minutes, and when the pH value of the water body does not reach the set range, regulating down or regulating up a frequency by the variable frequency controller of the acid-base dosing pump until the pH value reaches the set range.
5. The intelligent treatment method of electroplating chromium-containing wastewater according to claim 1, wherein the hexavalent chromium concentration in the target value adopts a one-hot encoding mode.
6. The intelligent treatment method of electroplating chromium-containing wastewater according to claim 1, wherein the determination of hexavalent chromium concentration and the determination of total chromium concentration are respectively a titration method and an atomic absorption method.
7. The intelligent treatment method of the electroplating chromium-containing wastewater according to claim 1, which is characterized by judging whether the sedimentation tank water body is turbid according to image data, and specifically comprising the following steps: converting the gray level of the image to obtain a gray level image; Performing edge enhancement processing on the gray level image, calculating a Laplace operator filtering variance value, performing fast Fourier transform on the gray level image, and calculating a fast Fourier transform amplitude average value; If the Laplace operator filtering variance value and the fast Fourier transform amplitude average value do not exceed the respective set threshold values, the turbidity of the sedimentation tank water body is judged, otherwise, the sedimentation tank water body is clear.

Description

Intelligent treatment system and method for electroplating chromium-containing wastewater Technical Field The invention relates to the field of wastewater treatment, in particular to an intelligent treatment system and method for electroplating chromium-containing wastewater. Background In the process of treating the electroplating chromium-containing wastewater, the scheme adopted at the present stage is generally a two-stage reduction-precipitation-filtration-advanced treatment method. The chromium-containing wastewater enters a first-stage pH regulating tank through a collecting tank, the pH value is regulated to be acidic, the wastewater continuously enters a two-stage chromium breaking tank for reduction reaction, highly toxic hexavalent chromium is reduced to low-toxicity trivalent chromium, the pH value of the wastewater is regulated to 7.5-8 through a second-stage pH regulating tank after the reduction reaction, the reduced trivalent chromium forms chromium hydroxide precipitate, the chromium hydroxide precipitate is removed through a coagulating sedimentation tank, the formed low-toxicity Cr (OH) 3 precipitate is comprehensively utilized after dehydration and drying, and the residual chromium ions contained in the supernatant are filtered through an intermediate water tank, enter deep treatment and reach the standard and are discharged. In the process, enough addition of the reducing agent is required to be ensured so as to reduce hexavalent chromium into trivalent chromium (the content of hexavalent chromium is less than or equal to 0.05 mg/L), and excessive addition of the reducing agent can cause poor precipitability of the trivalent chromium, so that stable colloid is formed and is difficult to precipitate, the total chromium content in supernatant is increased, and larger pressure is brought to subsequent deep treatment. In summary, the current control mode does not monitor the effluent of the coagulating sedimentation tank, the mode of controlling the dosing is rough, namely, the PLC automatic triggering control is performed by monitoring the online ORP value of the two-stage chromium breaking tank in a certain interval, the problem that excessive dosing of the drug is caused frequently exists, the sedimentation effect of the sedimentation tank is poor, the chromaticity of the supernatant is high, the total chromium concentration is high, the subsequent process load is large, the drug waste is much and the like. Therefore, in order to solve the above problems, a new intelligent treatment system and method for electroplating chromium-containing wastewater are needed, which can precisely control the dosage of the reducing agent, further save the dosage of the reducing agent and reduce the subsequent treatment load. Disclosure of Invention In view of the above, the invention aims to overcome the defects in the prior art, and provides an intelligent treatment system and method for electroplating chromium-containing wastewater, which can accurately control the dosage of a reducing agent, further save the dosage of the reducing agent and reduce the subsequent treatment load. The intelligent treatment system of the electroplating chromium-containing wastewater comprises a sensor module, an image acquisition module, an intelligent control center and a module to be controlled; the sensor module is used for collecting operation data, wherein the operation data comprises pH data and ORP data; the image acquisition module is used for acquiring supernatant image data of the sedimentation tank; The module to be controlled is used for carrying out variable frequency control of the dosing pump when dosing the chromium breaking tank and/or when adding acid or alkali to the pH adjusting tank; The intelligent control center is used for analyzing the received operation data and the received image data, sending control signals to the module to be controlled and realizing the variable frequency control of the module to be controlled. Further, the image acquisition module comprises an underwater industrial camera, an augmentation light source and a photoelectric signal transmission module; The underwater industrial camera is arranged on the upper part of the sedimentation tank, acquires supernatant image data of the sedimentation tank, and is connected with the intelligent control center through the photoelectric signal transmission module to transmit image signals. Further, the sensor module includes a first pH sensor disposed in the primary pH adjusting tank, a second pH sensor disposed in the secondary pH adjusting tank, a first ORP sensor disposed in the primary pH adjusting tank, a second ORP sensor disposed in the primary chromium breaking tank, and a third ORP sensor disposed in the secondary chromium breaking tank. Further, the module to be controlled comprises a first dosing pump variable frequency controller arranged in the first-stage chromium breaking tank, a second dosing pump variable frequency contro