CN115677004A - Electronic electroplating wastewater treatment and reuse system and method - Google Patents
Electronic electroplating wastewater treatment and reuse system and method Download PDFInfo
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- CN115677004A CN115677004A CN202211346338.3A CN202211346338A CN115677004A CN 115677004 A CN115677004 A CN 115677004A CN 202211346338 A CN202211346338 A CN 202211346338A CN 115677004 A CN115677004 A CN 115677004A
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Abstract
The invention relates to the field of electroplating wastewater treatment, in particular to an electronic electroplating wastewater treatment and recycling system and method. The utility model provides an electronic electroplating effluent handles recycling system, includes reaction tank and pH value adjustment mechanism, the reaction tank is used for holding waste water, pH value adjustment mechanism sets up in the reaction tank top, pH value adjustment mechanism is used for adjusting the pH value of waste water according to the demand, still includes: the pH value sensors are used for measuring the pH value of the wastewater in the reaction tank and generating pH value data, the reaction tank is divided into a plurality of regions from top to bottom, and each region is provided with at least one pH value sensor; a data processing module: the data processing module is used for receiving the pH value data of each region and calculating the pH value difference data of two adjacent regions. An electronic electroplating wastewater treatment and reuse method comprises the following steps: s1: the method has the advantages of inputting the wastewater into a reaction tank for \8230and \8230solvingthe problem of inaccurate reagent dosage when adjusting the pH value of the electroplating wastewater containing the cyanogen and the chromium.
Description
Technical Field
The invention relates to the field of electroplating wastewater treatment, in particular to a system and a method for treating and recycling electronic electroplating wastewater.
Background
The main pollutants of the electroplating wastewater are metal ions, acid and alkali substances, oxides and oil stains rinsed in the pretreatment process of a plating part matrix, and organic matters generated by using a surfactant and organic materials. But the main pollution of electroplating is heavy metal ion, acid, alkali and organic matter pollution. The waste water containing heavy metals mainly comes from electroplating and passivation processes, generally shows acidity, and the water quality components are related to coating metals (the common coating metals comprise chromium, zinc, nickel, cadmium, copper and silver). Waste water containing these metals is generated when the plated article is cleaned. The cyanide-containing wastewater comes from the cleaning stage of cyanide electroplating. The cleaning sewage after oil removal is alkaline, the sewage in the cyanide removing process is acidic and mainly contains sulfuric acid, hydrochloric acid, hydrofluoric acid and the like, and the process flow of the conventional electroplating wastewater treatment is shown as the attached figure 1.
The invention patent with application number 201610516273.0 discloses a treatment process of electroplating wastewater containing cyanogen and chromium, which is characterized in that: comprises the following steps of (1) leading the electroplating wastewater containing cyanogen and chromium to pass through an iron-carbon micro-electrolysis reactor; (2) Adjusting the pH value to 9 to 11, adding sodium hypochlorite, reacting for 10-60 minutes, controlling the pH value to be 4-6, reacting for 10-60 minutes, adding a flocculating agent, performing flocculation treatment, and performing precipitation treatment; (3) Adjusting the pH value to 10-12, then adding sodium hypochlorite to ensure that the oxidation-reduction potential of the treated wastewater is more than 350mV, and reacting for 30-60min; then adding active carbon, and reacting for 10-60min; (4) adding a flocculating agent, and then precipitating; the method can remove harmful substances in the wastewater, particularly remove the iron-cyanogen complex which is difficult to remove by the conventional method, adsorb heavy metals, and ensure that various indexes of the electroplating wastewater containing cyanogen and chromium reach the standard after the electroplating wastewater containing cyanogen and chromium is treated.
Taking the mixed cyanogen-chromium wastewater treatment as an example, firstly, cyanogen in the wastewater is removed under the alkaline condition of a specific range of numerical values, then, hexavalent chromium is reduced to trivalent chromium with lower toxicity under the acidic condition of the specific range of numerical values, and then, the wastewater is adjusted to the alkaline condition of the specific numerical values, and a flocculating agent is added to complete precipitation. When the treatment capacity of the wastewater is large, acid and alkali are added to adjust the pH value, the determination shows that the pH value in the wastewater is lagged, and if no dynamic evaluation is available, the amount of the added acid or alkali is not clear, so that excessive addition is possible, and the discharged wastewater does not reach the standard.
Disclosure of Invention
The invention provides a system and a method for treating and recycling electronic electroplating wastewater, which can solve the problem of inaccurate reagent dosage when adjusting the pH value of electroplating wastewater containing cyanogen and chromium.
In order to solve the technical problem, the present application provides the following technical solutions:
the utility model provides an electronic electroplating effluent handles recycling system, includes reaction tank and pH value adjustment mechanism, the reaction tank is used for holding waste water, pH value adjustment mechanism sets up in the reaction tank top, pH value adjustment mechanism is used for adjusting the pH value of waste water according to the demand, still includes:
the pH value sensors are used for measuring the pH value of the wastewater in the reaction tank and generating pH value data, the reaction tank is divided into a plurality of regions from top to bottom, and each region is respectively provided with at least one pH value sensor;
a data processing module: the data processing module is used for receiving the pH value data of each region and calculating the pH value difference data of two adjacent regions;
the pH value adjusting mechanism comprises an acid adjusting channel and an alkali adjusting channel, the acid adjusting channel is used for adding acid into the reaction tank to adjust the pH value of the wastewater, the alkali adjusting channel is used for adding alkali into the reaction tank to adjust the pH value of the wastewater, electronic water valves are mounted on the acid adjusting channel and the alkali adjusting channel, the electronic water valves are used for controlling the acid adjusting channel and the alkali adjusting channel to open and close the wastewater tank to add acid and alkali and the speed of adding acid or alkali when receiving a control instruction of the data processing module, and the electronic water valves are provided with a plurality of gears for adjusting the instantaneous flow of the added acid or alkali;
a medicament addition channel: the medicament adding channel is used for adding sodium sulfite and a flocculating agent into the wastewater when the pH value of the wastewater reaches a preset value;
the data processing module sends out corresponding control instructions according to the pH value of each region and the pH value difference data of each adjacent partition, if the pH value of the last but one region from top to bottom does not reach a preset value, the data processing module controls the electronic water valve to add acid or alkali at the fastest speed, if the pH value of the last but one region reaches the preset value and the pH value difference data of the two lowermost regions of the two lowermost adjacent regions do not reach a threshold value, the data processing module controls the electronic water valve to add acid or alkali at the slowest speed; and when the pH value difference data of the two lowermost areas reach a threshold value, the data processing module controls the electronic water valve to be closed, and simultaneously the data processing module controls the medicament adding channel to add the medicament to the wastewater.
Basic principle and beneficial effect: the pH value sensors are arranged in each subarea of the reaction tank from top to bottom, the pH value adjusting mechanism is arranged above the reaction tank and used for carrying out directional adjustment on the pH value in the tank according to requirements, namely reducing original hexavalent chromium into trivalent chromium, then converting the trivalent chromium into chromium hydroxide flocculent precipitate, and adding sodium sulfite and a flocculating agent to ensure that the flocculent precipitate is converged into large particles to be conveniently filtered.
Because the reaction tank is used as a wastewater treatment tank, the capacity is usually large, when the pH value is adjusted by adding acid or alkali, the upper-layer solution possibly reaches the preset pH value, but the pH value of the lower-layer solution is not changed, the scheme intelligently manages the valves of the alkali adjusting channel and the acid adjusting channel, dynamic adjustment of the pH value of each part in the reaction tank is completed through data measured by pH value sensors at multiple positions, the adding speed and dosage of the alkali adjusting channel and the acid adjusting channel are controlled, so that the time is saved, the labor cost of manual operation is reduced, and the intelligent control mode ensures that the control is more accurate, reduces dosage errors when artificial feeding is performed, saves raw materials and time, and solves the problem of inaccurate dosage of reagent added when the pH value of the electroplating wastewater containing chromium cyanide is adjusted
Furthermore, the reaction tank divided regions comprise an upper region, a middle region and a lower region.
Has the advantages that: according to the height of the reaction tank, the reaction tank is uniformly divided into 3 parts from top to bottom, namely an upper layer area, a middle layer area and a lower layer area, a plurality of point locations collect data, more data samples are provided, later analysis and use are facilitated, the three-layer areas are formed, the data samples are prevented from being concentrated, the details of the pH value of each part in the reaction tank are reflected as much as possible, and a basis is provided for the subsequent pH value adjustment by adding acid or alkali.
Further, the data processing module receives upper layer region, middle layer region, upper layer region pH value data, middle layer region pH value data measured by a pH value sensor in the lower layer region, calculates first difference value data of the upper layer region pH value data and the middle layer region pH value data, and second difference value data of the middle layer region pH value data and the lower layer region pH value data, the electronic water valve is provided with a plurality of gears including a high-speed gear, a medium-speed gear and a low-speed gear, when the upper layer region pH value does not reach the preset pH value or the upper layer region pH value reaches the preset pH value, and the first difference value data does not reach a first threshold value, the data processing module sends out a high-speed continuous feeding instruction, and the electronic water valve controls the corresponding acid adjusting channel or alkali adjusting channel to continuously add acid or alkali into the reaction tank at the high-speed gear; when the pH value of the middle layer area does not reach a preset pH value, the first difference data exceeds a first threshold value, the second difference data does not reach a second threshold value, the data processing module sends a medium-speed continuous feeding instruction, and the electronic water valve controls the corresponding acid adjusting channel or alkali adjusting channel to continuously add acid or alkali into the reaction tank at a medium speed; when the pH value of the middle layer area reaches a preset pH value and the second difference value data does not reach a second threshold value, the data processing module sends a low-speed continuous feeding instruction, and the electronic water valve controls the corresponding acid adjusting channel or alkali adjusting channel to continuously add acid or alkali into the reaction tank at a low speed; and when the second difference data reaches a second threshold value, closing the electronic valve.
Has the advantages that: and (3) data evaluation and control, wherein the speed of adding acid or alkali is determined according to the pH difference value between layers, so that the adding time is saved, and the using amount is more accurate.
Further, still include feed liquor pipe and drain pipe, feed liquor pipe and drain pipe all communicate with the reaction tank, the feed liquor pipe is used for importing waste water into the reaction tank, the drain pipe is arranged in the reaction tank and adds the flocculating agent after, with the supernatant discharge reaction tank of deposit.
Has the advantages that: the liquid inlet pipe and the liquid outlet pipe are arranged, so that the wastewater treatment becomes a flow line, namely, the wastewater is input, treated and output, and the intelligent and flow management is realized.
Further, the device also comprises an ion exchange column, wherein the ion exchange column is arranged in the position close to the reaction tank in the drain pipe, and ion exchange resin in the ion exchange column can be strong acid or weak acid cation resin and is used for removing metal cations in supernatant liquid.
Has the advantages that: and absorbing the metal ions in the supernatant liquid, so that the content of the metal ions in the discharged supernatant liquid is reduced, and the discharge standard is met.
Further, an electric three-way shunt regulating valve is mounted at the water outlet of the water outlet pipe, the water outlet of the water outlet pipe is connected with the inlet of the electric three-way shunt regulating valve, one outlet of the electric three-way shunt regulating valve is communicated with a special sewage discharge pipeline, and the other outlet of the electric three-way shunt regulating valve is communicated with the reaction tank; and a metal ion detection mechanism is also arranged in a water outlet pipe between the ion exchange column and the electric three-way shunt regulating valve and used for detecting the content of metal ions in supernatant, if the content of the metal ions does not exceed a preset value, the electric three-way shunt regulating valve opens an outlet communicated with the special sewage discharge pipeline, and if the content of the metal ions exceeds the preset value, the electric three-way shunt regulating valve opens an outlet communicated with the reaction tank.
Has the advantages that: if the content of the metal ions in the supernatant to be discharged exceeds the standard, the metal ions are converged into the reaction tank, and if the content of the metal ions is within the standard range, the metal ions are discharged into a special sewage discharge pipeline, so that the treatment is finished.
Further, still include rabbling mechanism, rabbling mechanism sets up in the reaction tank.
Has the advantages that: the reaction in the reaction tank is more sufficient, and the reaction efficiency is accelerated.
An electronic electroplating wastewater treatment and reuse method comprises the following steps:
s1: inputting the wastewater into a reaction tank;
s2: removing cyanogen in the wastewater, and reducing hexavalent chromium into trivalent chromium;
s3: adding sodium sulfite and a flocculating agent into the wastewater to generate a precipitate;
s4: passing the supernatant through an ion exchange column to remove metal ions in the supernatant;
s5: and detecting the content of metal ions in the supernatant liquid after passing through the ion exchange column, and enabling the treated supernatant liquid to enter a special sewage discharge channel or return to the reaction tank according to a detection result.
And further, performing pressure filtration on the precipitate generated in the step S3 under 2-4MPa, returning the filtrate to the reaction tank, and recycling the precipitate.
Further, the flocculant is one of polyacrylamide, PAC and PFC.
Drawings
FIG. 1 is a schematic view of an electronic electroplating wastewater treatment and recycling system;
FIG. 2 is a process diagram of a method for treating and recycling electronic electroplating wastewater;
FIG. 3 is a schematic view of an infiltration treatment tank according to a second embodiment;
FIG. 4 is a schematic view of a reaction chamber in example two.
The specification reference numbers: a permeation treatment pool 100, a third anode 101, a third cathode 102, a direct current power supply 103, a bipolar membrane 104, an anion exchange membrane 105, a cation exchange membrane 106, an alkali discharge port 1071, an acid discharge port 1072, and a reflux port 1073.
Detailed Description
The following is further detailed by way of specific embodiments:
as an example of an implementation thereof, as shown in figure 1,
the utility model provides an electron electroplating wastewater handles recycling system, includes reaction tank and pH value adjustment mechanism, right the reaction tank is from last to dividing three region down, is the upper strata region respectively, and the middle level is regional, and lower floor's region, wherein every regional height account for the reaction tank overall height and detach 1/3 of the residual height behind the sediment height, guarantees that the sediment height among the follow-up reaction is not submergible in the regional pH value sensor of follow-up setting in lower floor as the standard, the reaction tank is used for holding waste water, pH value adjustment mechanism sets up in the reaction tank top, pH value adjustment mechanism is used for adjusting the pH value of waste water according to the demand, still includes:
the pH value sensors are used for measuring the pH value of the wastewater in the reaction tank and generating pH value data, and each region is provided with at least one pH value sensor; wherein the upper layer area is arranged at the upper left, the middle layer area is arranged in the middle, the lower layer area is arranged at the lower right, and the pH value sensor adopts an online pH meter P535 type.
A data processing module: the data processing module selects the i3 12110f cpu and related components to complete data processing and send related instructions. The data processing module receives upper layer region pH value data, middle layer region pH value data and lower layer region pH value data measured by the pH value sensor in the upper layer region, the middle layer region pH value data and the lower layer region pH value data respectively, and calculates first difference value data of the upper layer region pH value data and the middle layer region pH value data and second difference value data of the middle layer region pH value data and the lower layer region pH value data.
The pH value adjusting mechanism comprises an acid adjusting channel and an alkali adjusting channel, the acid adjusting channel is used for adding acid into the reaction tank to adjust the pH value of the wastewater, the alkali adjusting channel is used for adding alkali into the reaction tank to adjust the pH value of the wastewater, electronic water valves are mounted on the acid adjusting channel and the alkali adjusting channel, the electronic water valves are used for controlling the acid adjusting channel and the alkali adjusting channel to open and close the wastewater tank to add acid and alkali and the speed of adding acid or alkali when receiving a control instruction of the data processing module, and the electronic water valves are provided with a plurality of gears for adjusting the instantaneous flow of the added acid or alkali; the electronic water valve is provided with a plurality of gears including a high-speed gear, a medium-speed gear and a low-speed gear, in this embodiment, the opening degree of the valve is used as a speed judgment standard, that is, when the electronic water valve is opened by 100%, the electronic water valve is opened by 60% to obtain the high-speed gear, and when the electronic water valve is opened by 20%, the electronic water valve is opened by 20% to obtain the low-speed gear.
In this embodiment, the first difference data and the second difference data are selected to be 0.3, and the preset pH value of the wastewater under the acidic or alkaline reaction condition is an average value of the selectable range interval values. Taking the preset value of 2.5 (the pH value of the wastewater is reduced by adding acid under the alkaline condition) when the pH value in the optional range is 2-3 as an example, when the pH value data in the upper layer does not reach 2.5, adding acid at a high speed; when the pH value data of the upper layer region reaches 2.5 and the pH value data of the middle layer region does not reach 2.8, adding acid at a medium speed gear to reduce the pH value of the wastewater; if regional pH value data of middle level reaches 2.5, when bottom pH value data is not to 2.8, with the low-speed gear add acid, reduce waste water pH value, if bottom pH value data reaches 2.8, then close and add the acid valve, indicate that the pH value of waste water has adjusted successfully, still include rabbling mechanism, rabbling mechanism sets up in the reaction tank, and rabbling mechanism is used for rotating when adding acid or alkali regulation pH value or when adding the medicament for waste water and the integration of the acid, alkali or the medicament that add, promotion reaction fusion efficiency.
A medicament addition channel: the agent adding channel is used for adding sodium sulfite when the pH value of the wastewater is 8.2-10.4, adjusting the pH value of the wastewater to an interval range through the pH value adjusting mechanism if the pH value of the wastewater is not in the interval range, and indicating that the pH value adjustment is successful when the pH value data of a lower layer reaches 9.0 (the pH value of the wastewater is adjusted to be alkaline from acidity) or 9.6 (the pH value of the wastewater is reduced from strong alkalinity) when the pH value of the lower layer reaches a preset value, and then adding the sodium sulfite until the adding concentration of the sodium sulfite is 8 times of the total cyanogen concentration (the cyanogen concentration is measured through a sampling test) to perform an aeration reaction. After the reaction is finished, adjusting the pH value of the wastewater to 2-3, namely when the wastewater is in an acidic condition, reducing hexavalent chromium in the wastewater into trivalent chromium by using sodium sulfite, adding polyacrylamide serving as a flocculating agent after the reduction is finished, enabling chromium ions to form compound precipitate, wherein the precipitation time is 2 hours, and then performing filter pressing and recovery on the precipitate;
still include feed liquor pipe and drain pipe, feed liquor pipe and drain pipe all communicate with the reaction tank, the feed liquor pipe is used for importing waste water into the reaction tank, the drain pipe is arranged in adding behind the flocculating agent in the reaction tank, with the supernatant discharge reaction tank of sediment.
The device also comprises an ion exchange column, wherein the ion exchange column is arranged in the position close to the reaction tank in the drain pipe, and ion exchange resin in the ion exchange column can be strong acid or weak acid cation resin and is used for removing metal cations in supernatant liquid.
The water outlet of the water outlet pipe is provided with an electric three-way shunt regulating valve, the water outlet of the water outlet pipe is connected with the inlet of the electric three-way shunt regulating valve, one outlet of the electric three-way shunt regulating valve is communicated with a special sewage discharge pipeline, and the other outlet of the electric three-way shunt regulating valve is communicated with the reaction tank; and a metal ion detection mechanism is also arranged in a water outlet pipe between the ion exchange column and the electric three-way shunt regulating valve and used for detecting the content of metal ions in supernatant, if the content of the metal ions does not exceed a preset value, the electric three-way shunt regulating valve opens an outlet communicated with the special sewage discharge pipeline, and if the content of the metal ions exceeds the preset value, the electric three-way shunt regulating valve opens an outlet communicated with the reaction tank.
The electronic electroplating wastewater treatment and reuse method comprises the following steps:
s1: inputting the wastewater into a reaction tank;
s2: removing cyanogen in the wastewater, and reducing hexavalent chromium into trivalent chromium;
s3: adding sodium sulfite and a flocculating agent into the wastewater to generate a precipitate; and carrying out filter pressing on the generated precipitate under 2-4MPa, returning filtrate to the reaction tank, and recycling the precipitate.
S4: passing the supernatant through an ion exchange column to remove metal ions in the supernatant;
s5: and detecting the content of metal ions in the supernatant liquid after passing through the ion exchange column, and enabling the treated supernatant liquid to enter a special sewage discharge channel or return to the reaction tank according to a detection result.
Example two
The second embodiment is different from the first embodiment in that: as shown in fig. 3, includes a permeate processing cell 100: the permeation treatment tank 100 is divided into an anode chamber, a first reaction tank, a second reaction tank and a metal ion chamber by an anode, an anion exchange membrane 105, a bipolar membrane 104, a cation exchange membrane 106, an anion exchange membrane 105 and a cathode which are sequentially arranged, wherein the anode and the second cathode are respectively and electrically connected with the anode and the cathode of a direct current power supply 103, the bipolar membrane 104 is formed by compounding an anion exchange layer and a cation exchange layer, the first reaction tank is provided with an alkali discharge port 1071, and the second reaction tank is provided with an acid discharge port 1072;
a reaction box: as shown in fig. 4, three holes are formed at the left end and the right end of the reaction box, wherein the two holes are respectively communicated with an alkali discharge port 1071 and an acid discharge port 1072 on the first reaction chamber; a plurality of exhaust holes are also formed above the reaction box; the return port 1073 on the reaction water tank is communicated with the return ports 1073 of the first reaction chamber and the second reaction chamber through pipelines, the return port 1073 on the reaction water tank is also communicated with a liquid inlet pipe, the reaction tank enters into the reaction tank to start subsequent reaction, and all the pipelines are provided with valves. When the pretreatment is started, wastewater and wastewater are respectively led into the first reaction chamber and the second reaction chamber, and when the content of metal ions reaches the national discharge standard, the solution in the reaction tank enters the reaction tank through the liquid inlet pipe for subsequent treatment.
In order to prevent the generation of carbon dioxide gas in the second reaction chamber with respect to the waste water containing a large amount of carbonate ions, bipolar membrane 104 is subjected to membrane burning in the following manner. H2O between the cathode membrane composite layer and the anode membrane composite layer of the bipolar membrane 104 is dissociated into H + and OH-, and the H + and the OH-are respectively used as H + and OH-ion sources through the cathode membrane and the anode membrane, hydrogen ions penetrate through the anode membrane layer of the bipolar membrane 104 and enter a second reaction tank, and metal ions enter a metal ion chamber under the action of an electric field; initially adjusting the pH value of the second reaction tank to ensure that carbonate ions and hydrogen ions only can react to generate bicarbonate, and then introducing a compound formed by the bicarbonate ions into the reaction tank through an acid discharge port 1072; hydroxyl ions permeate the cathode membrane of the bipolar membrane 104 to enter the first reaction tank, metal ions enter the anode chamber under the action of an electric field, the separation of the metal ions is completed, the solution in the first reaction tank is alkaline, the liquid in the first reaction chamber is communicated with the reaction chamber through the alkali discharge port 1071, the liquid in the first reaction chamber fully reacts with the liquid in the second reaction chamber, carbon dioxide is generated to be discharged, the removal of carbonate is completed, the solution flows back to the first reaction chamber and the second reaction chamber through holes in the reaction box, the solution is alkaline at the moment and returns to the second reaction tank again, hydrogen ions generated newly are further consumed, and the phenomenon that the bipolar membrane 104 is burnt by carbon dioxide generated in the second reaction chamber is prevented. And no new alkaline substance is added into the second reaction chamber to adjust the pH value, so that the use of the alkaline substance is reduced. The permeation treatment tank 100 and the reaction box are used for removing carbonate ions in the wastewater and simultaneously completing the primary separation of metal ions and non-metal ions in the wastewater. When the content of the metal ions is reduced to the national standard line, the liquid in the first reaction chamber and the liquid in the second reaction chamber are completely discharged to the reaction tank through the reaction box for treatment, so that the content of the metal ions in the wastewater is further reduced.
The above are only examples of the present invention, and the present invention is not limited to the field related to the embodiments, the general knowledge of the specific structures and characteristics of the embodiments is not described herein, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in the field, and have the capability of applying the conventional experimental means before the application date, and those skilled in the art can combine the capabilities of themselves to complete and implement the present invention, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides an electronic electroplating effluent handles recycling system, includes reaction tank and pH value adjustment mechanism, the reaction tank is used for holding waste water, pH value adjustment mechanism sets up in the reaction tank top, pH value adjustment mechanism is used for adjusting the pH value of waste water according to the demand, its characterized in that still includes:
the pH value sensors are used for measuring the pH value of the wastewater in the reaction tank and generating pH value data, the reaction tank is divided into a plurality of regions from top to bottom, and each region is respectively provided with at least one pH value sensor;
a data processing module: the data processing module is used for receiving the pH value data of each region and calculating the pH value difference data of two adjacent regions;
the pH value adjusting mechanism comprises an acid adjusting channel and an alkali adjusting channel, the acid adjusting channel is used for adding acid into the reaction tank to adjust the pH value of the wastewater, the alkali adjusting channel is used for adding alkali into the reaction tank to adjust the pH value of the wastewater, electronic water valves are mounted on the acid adjusting channel and the alkali adjusting channel, the electronic water valves are used for controlling the acid adjusting channel and the alkali adjusting channel to open and close the wastewater tank to add acid and alkali and the speed of adding acid or alkali when receiving a control instruction of the data processing module, and the electronic water valves are provided with a plurality of gears for adjusting the instantaneous flow of the added acid or alkali;
a medicament addition channel: the medicament adding channel is used for adding sodium sulfite and a flocculating agent into the wastewater when the pH value of the wastewater reaches a preset value;
the data processing module sends out corresponding control instructions according to the pH value of each region and the pH value difference data of each adjacent partition, if the pH value of the last but one region from top to bottom does not reach a preset value, the data processing module controls the electronic water valve to add acid or alkali at the fastest speed, if the pH value of the last but one region reaches the preset value and the pH value difference data of the two lowermost regions of the two lowermost adjacent regions do not reach a threshold value, the data processing module controls the electronic water valve to add acid or alkali at the slowest speed; and when the pH value difference data of the two lowermost areas reach a threshold value, the data processing module controls the electronic water valve to be closed, and simultaneously controls the medicament adding channel to add the medicament to the wastewater.
2. The system according to claim 1, wherein the system comprises: the reaction tank divided areas comprise an upper layer area, a middle layer area and a lower layer area.
3. The system according to claim 2, wherein the system comprises: the data processing module receives upper layer region pH value data, middle layer region pH value data and lower layer region pH value data measured by a pH value sensor in a lower layer region respectively, calculates first difference value data of the upper layer region pH value data and the middle layer region pH value data and second difference value data of the middle layer region pH value data and the lower layer region pH value data, the electronic water valve is provided with a plurality of gears comprising a high-speed gear, a medium-speed gear and a low-speed gear, when the upper layer region pH value does not reach a preset pH value or the upper layer region pH value reaches the preset pH value, and the first difference value data does not reach a first threshold value, the data processing module sends out a high-speed continuous feeding instruction, and the electronic water valve controls a corresponding acid adjusting channel or an alkali adjusting channel to continuously add acid or alkali into the reaction tank at the high-speed gear; when the pH value of the middle layer area does not reach a preset pH value, the first difference data exceeds a first threshold value, the second difference data does not reach a second threshold value, the data processing module sends a medium-speed continuous feeding instruction, and the electronic water valve controls the corresponding acid adjusting channel or alkali adjusting channel to continuously add acid or alkali into the reaction tank at a medium speed; when the pH value of the middle layer area reaches a preset pH value and the second difference value data does not reach a second threshold value, the data processing module sends a low-speed continuous feeding instruction, and the electronic water valve controls the corresponding acid adjusting channel or alkali adjusting channel to continuously add acid or alkali into the reaction tank at a low speed; and when the second difference data reaches a second threshold value, closing the electronic valve.
4. The system according to claim 1, wherein the system comprises: still include feed liquor pipe and drain pipe, feed liquor pipe and drain pipe all communicate with the reaction tank, the feed liquor pipe is used for inputing waste water into the reaction tank, the drain pipe is arranged in the reaction tank after adding the flocculating agent, with the supernatant discharge reaction tank of sediment.
5. The system according to claim 4, wherein the system comprises: the device also comprises an ion exchange column, wherein the ion exchange column is arranged in the position close to the reaction tank in the drain pipe, and the ion exchange resin in the ion exchange column can be strong-acid or weak-acid cation resin and is used for removing metal cations in supernatant liquid.
6. The system according to claim 4, wherein the system comprises: the water outlet of the water outlet pipe is provided with an electric three-way shunt regulating valve, the water outlet of the water outlet pipe is connected with the inlet of the electric three-way shunt regulating valve, one outlet of the electric three-way shunt regulating valve is communicated with a special sewage discharge pipeline, and the other outlet of the electric three-way shunt regulating valve is communicated with the reaction tank; and a metal ion detection mechanism is also arranged in a water outlet pipe between the ion exchange column and the electric three-way shunt regulating valve and used for detecting the content of metal ions in supernatant, if the content of the metal ions does not exceed a preset value, the electric three-way shunt regulating valve opens an outlet communicated with the special sewage discharge pipeline, and if the content of the metal ions exceeds the preset value, the electric three-way shunt regulating valve opens an outlet communicated with the reaction tank.
7. The system according to claim 1, wherein the system comprises: still include rabbling mechanism, rabbling mechanism sets up in the reaction tank.
8. The method for treating and recycling the electronic electroplating wastewater is characterized by comprising the following steps: the method comprises the following steps:
s1: inputting the wastewater into a reaction tank;
s2: removing cyanogen in the wastewater, and reducing hexavalent chromium into trivalent chromium;
s3: adding sodium sulfite and a flocculating agent into the wastewater to generate a precipitate;
s4: passing the supernatant through an ion exchange column to remove metal ions in the supernatant;
s5: and detecting the content of metal ions in the supernatant liquid after passing through the ion exchange column, and enabling the treated supernatant liquid to enter a special sewage discharge channel or return to the reaction tank according to a detection result.
9. The method for treating and recycling the electronic electroplating wastewater according to claim 8, which is characterized in that: and (4) performing filter pressing on the precipitate generated in the step (S3) under 2-4MPa, returning the filtrate to the reaction tank, and recycling the precipitate.
10. The method for treating and recycling the electronic electroplating wastewater according to claim 8, characterized in that: the flocculant is one of polyacrylamide, PAC and PFC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211346338.3A CN115677004A (en) | 2022-10-31 | 2022-10-31 | Electronic electroplating wastewater treatment and reuse system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211346338.3A CN115677004A (en) | 2022-10-31 | 2022-10-31 | Electronic electroplating wastewater treatment and reuse system and method |
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