CN109354134B - Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation - Google Patents
Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation Download PDFInfo
- Publication number
- CN109354134B CN109354134B CN201811245346.2A CN201811245346A CN109354134B CN 109354134 B CN109354134 B CN 109354134B CN 201811245346 A CN201811245346 A CN 201811245346A CN 109354134 B CN109354134 B CN 109354134B
- Authority
- CN
- China
- Prior art keywords
- wastewater
- plates
- anode
- electric flocculation
- chromaticity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a method for removing chromaticity of anodic oxidation dyeing wastewater by electrocoagulation, which comprises the following steps: 1) pumping the dyeing wastewater into a pH adjusting tank to adjust the pH value to 2-4; 2) pumping the regulated wastewater into an electric flocculation device to perform electric flocculation and electric oxidation reaction; 3) pumping the waste water after electro-oxidation into a sedimentation tank, adding alkali to adjust the pH value to 7-9, and then adding a flocculating agent for treatment. The method is based on a self-designed reactor, and can effectively improve the treatment efficiency of the dyeing sewage by setting a three-step treatment mechanism, wherein hydroxyl radicals generated in an electrolytic flocculation device are used for carrying out oxidative decomposition on a metal complex, then the polynuclear hydroxyl complex generated by an anode is used for flocculating and precipitating metal ions, the diffusion degree of flocs can be increased through aeration, the anode passivation is delayed, the chromaticity removal effect of the dyeing wastewater is improved, and the chromaticity of effluent is ensured to be within 5 times.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for removing chromaticity of anodic oxidation dyeing wastewater by electrocoagulation.
Background
The anodic oxidation technology is a common and main technology in surface treatment in the electroplating industry, and is widely applied in the electroplating industry. Generally, metal members need to be degreased with acid and alkali before an anodizing process, or need to be dyed in order to improve the surface hardness and wear resistance of metals, and a large amount of dyeing wastewater is generated during a series of dyeing processes. After the anodic oxidation, the surface sealing treatment needs to be carried out on the metal component of the plated part. At present, most electroplating enterprises mostly adopt nickel acetate as a hole sealing agent, in the process, the enterprises can generate a large amount of oil removal wastewater, acid-base wastewater, nickel-containing wastewater and the like, and the wastewater contains a pollutant nickel which is strictly controlled by the state, so that the wastewater can be discharged after being properly treated. The conventional treatment methods at present comprise a physical and chemical method and a biochemical method, and the biochemical method adopts an active polluted sludge method, an anaerobic biochemical treatment method and an aeration biological filter method. However, the prior methods can not completely treat the anode dyeing wastewater, are difficult to completely decolorize and are easy to generate secondary pollution in the treatment process.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a method for removing the chromaticity of anodic oxidation dyeing wastewater through electrocoagulation, which can effectively improve the treatment efficiency of dyeing wastewater by setting a three-step treatment mechanism on the basis of a self-designed reactor, wherein a cathode in an electrocoagulation device generates a certain amount of hydroxyl radicals to perform oxidative decomposition on a metal complex, and then the metal ions are subjected to flocculation and precipitation through a polynuclear hydroxyl complex generated by an anode, so that the effect of removing the metal complex in one step is achieved, the diffusion degree of flocs in the reactor is increased through aeration, the passivation effect of the anode is delayed, and then the optimal operation condition is achieved through a series of parameter adjustment, the chromaticity removal effect of the dyeing wastewater is improved, and the chromaticity of effluent is ensured to be less than 5 times.
The purpose of the invention is realized by the following technical scheme: a method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting pool, and adjusting the pH value of the wastewater to 2-4 by using an acidity regulator;
2) then, pumping the wastewater regulated by the acidity regulator into an electric flocculation device for electric flocculation and electric oxidation reaction;
3) pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding alkali to adjust the pH value to 7-9, adding a coagulant to perform coagulating sedimentation treatment, and finally discharging the wastewater with the color up to the standard after passing through a filtering device.
The wastewater chromaticity treatment method provided by the invention can effectively improve the treatment efficiency of dyeing wastewater by setting a four-step treatment mechanism on the basis of a self-designed reactor. Pumping dyeing wastewater into the pH value adjusting pool in the step 2), adjusting the pH value of the wastewater to 2-4 by an acidity regulator, pumping the adjusted wastewater into an electric flocculation device for electric flocculation and electric oxidation reaction, generating a large amount of metal ions by a soluble anode material and generating a series of polynuclear hydroxyl complexes and hydroxides with hydroxide radicals in water, and flocculating and precipitating pollutants in a water body to separate the pollutants from the solution; and in the step 3), the chroma of the anodic oxidation dyeing wastewater in the original collecting tank can be reduced to be within 5 times after the wastewater after the electric flocculation treatment is subjected to mud mixing and sedimentation treatment.
Preferably, the acidity regulator is sulfuric acid or hydrochloric acid.
In the method for treating the chromaticity of the wastewater, the acidity regulator sulfuric acid or hydrochloric acid is adopted when the pH value is adjusted, and the sulfuric acid or hydrochloric acid is used for adjusting the pH value, so that an acid-base pair is easily formed with cations of the wastewater, a system with stable acidity can be further maintained, and in addition, the acidity regulator sulfuric acid or hydrochloric acid can form a precipitate with heavy metal ions in the wastewater to play a role in preliminary degradation.
Preferably, the electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, a through hole plate, an anode plate, a cathode plate, an aeration pipe, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plate is arranged inside the electrolytic tank, the anode brush is arranged in the through hole plate, the through hole plate is arranged between the anode plates, a cathode and anode spacing plate is arranged between the anode plates and the corresponding cathode plate, the aeration pipe is arranged below the anode brush, the water inlet pipe is arranged at the lower part of the electrolytic tank, and the water outlet pipe is arranged at the upper part of the electrolytic tank.
In the wastewater chromaticity treatment method, the anode brush is arranged on the electric flocculation device, the polar plate is dissolved and generates a series of physicochemical reactions under the action of an external electric field, so that the purpose of removing pollutants is achieved, the anode brush is arranged on the anode, the polar plate can be effectively prevented from being covered by the wastewater or dirt generated after the reaction in the treatment process to influence the treatment effect, and the problem of polar plate passivation of the electrolysis device is solved.
In the wastewater chromaticity treatment method, hydroxyl radicals are generated when the wastewater is electrolyzed by the electric flocculation device, so that organic matters which are difficult to degrade in the anode surface dyeing wastewater can be oxidized into micromolecular organic matters, unsaturated structures of chromophoric groups and chromophoric groups are damaged, colors are removed, and the reduction of the wastewater chromaticity is facilitated.
Preferably, the voltage is maintained at 20-25V and the current density is 65-100A/m when electrolysis is carried out in the electric flocculation device2The reaction time is 30-60 min.
In the wastewater chromaticity treatment method of the invention, the voltage is maintained within the range of 20-25V when the electrolysis is carried out in the electric flocculation device, the electrodes can be electrolyzed in an optimal voltage range, if the voltage is too high, the electrolysis too fast can cause the speed of the generated free radicals to be too fast, the combination rate of the free radicals and the ions in the waste water is exceeded, the generated free radicals are combined with the ions after the electrolysis again, the electric energy is wasted, the current density is maintained in the range of 65-100A/m2, if the current density is too high, although the operation unit can be reduced, however, the energy loss and the current efficiency are correspondingly reduced, and if the current density is too low, the effect of sufficient electrolysis is not achieved, the reaction time is controlled within 30-60min, the electrolytic reaction effect is optimal, the electrolytic efficiency is difficult to improve after the time is exceeded, the power supply is wasted, and the required degradation efficiency cannot be achieved if the time is too short.
Preferably, after the reaction in the step 3) is finished, adding an alkaline regulator to adjust the pH value so as to maintain the pH value at 7-9.
In the wastewater chromaticity treatment method, the coagulant added in the technology needs to be carried out under an alkaline condition, but if the alkalinity is too strong, the whole waste liquid is strongly alkaline, so that the electrolytic effect is reduced, and the wastewater treatment efficiency of the whole process is influenced.
Preferably, the coagulant is at least one of polyacrylic acid, sodium polyacrylate, calcium polyacrylate and polyacrylamide.
In the method for treating the chromaticity of the wastewater, the organic polymer flocculant is prepared into an aqueous solution to be added into the wastewater, so that a compressed double electric layer is generated, suspended particles in the wastewater lose stability, colloidal particles are mutually condensed to enlarge the particles, and a flocculating agent and alum floc are formed. After the flocculating constituent grows to a certain volume, the flocculating constituent is separated from the water phase under the action of gravity and is precipitated, so that a large amount of suspended matters in the wastewater are removed, and the effect of wastewater treatment is achieved.
Preferably, in the step 3), the coagulation treatment time is 30-60 min.
In the wastewater chromaticity treatment method, the coagulation treatment time is limited within the range of 30-60min, if the coagulation time is too short, a part of flocculating constituents formed are not completely settled, and the optimal coagulation effect cannot be achieved, and when the coagulation time is 30-60min, the formed flocculating constituents are completely settled, and if the coagulation time is prolonged, the effect of continuous coagulation cannot be achieved, but time and resources are wasted.
The invention has the beneficial effects that: the invention can effectively improve the treatment efficiency of dyeing wastewater by setting a four-step treatment mechanism on the basis of a self-designed reactor, wherein a cathode in an electrolytic flocculation device generates a certain amount of hydroxyl radicals to carry out oxidative decomposition on a metal complex, and then the metal ions are flocculated and precipitated by a polynuclear hydroxyl complex generated by an anode, thereby achieving the effect of removing the metal complex in one step, increasing the diffusion degree of the flocs in the reactor by aeration, simultaneously delaying the passivation effect of the anode, and then achieving the optimal operation condition by a series of parameter adjustment, improving the chromaticity removal effect of dyeing wastewater and ensuring that the chromaticity of effluent is less than 5 times.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic view of the construction of an electrocoagulation apparatus used in the present invention.
The reference signs are: 1-electrolytic tank, 2-anode brush, 3-through hole plate, 4-anode plate, 5-cathode plate, 6-aeration pipe, 7-water inlet pipe, 8-water outlet pipe and 9-cathode and anode spacing plate.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying drawings 1-2, and the content of the embodiments is not intended to limit the present invention.
Example 1
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting tank, and adjusting the pH value of the wastewater to 2 by using sulfuric acid;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 7;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent polyacrylic acid for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 20V when electrolysis is carried out, and the current density is 65A/m2The reaction time was 30 min.
Example 2
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting pool, and adjusting the pH value of the wastewater to 2.5 by using hydrochloric acid;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 7.5;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent calcium polyacrylate for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 21V when electrolysis is carried out, and the current density is 72A/m2The reaction time was 37 min.
Example 3
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting tank, and adjusting the pH value of the wastewater to 3 by using a mixture of sulfuric acid and hydrochloric acid according to the weight part of 1: 1;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 8;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent sodium polyacrylate for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 23V when electrolysis is carried out, and the current density is 80A/m2The reaction time was 45 min.
Example 4
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the dyeing wastewater subjected to anodic oxidation into a pH value adjusting tank, and adjusting the pH value of the wastewater to 3.5 by using sulfuric acid;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 8.5;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent polyacrylamide for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage is maintained at 24V and the current density is 90A/m when the electrolysis is carried out in the electric flocculation device2The reaction time was 53 min.
Example 5
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting pool, and adjusting the pH value of the wastewater to 4 by using hydrochloric acid;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 9;
3) pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a mixture of flocculating agent sodium polyacrylate and polyacrylic acid according to the weight ratio of 1:1 for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 25V when electrolysis is carried out, and the current density is 100A/m2The reaction time was 60 min.
Comparative example 1
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting tank, and adjusting the pH value of the wastewater to 2 by using sulfuric acid;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 7;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent polyacrylic acid for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 15V when electrolysis is carried out, and the current density is 30A/m2The reaction time was 30 min.
Comparative example 2
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting tank, and adjusting the pH value of the wastewater to 3 by using a mixture of sulfuric acid and hydrochloric acid according to the weight part of 1: 1;
2) then pumping the wastewater regulated by sulfuric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 8;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent sodium polyacrylate for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank.
The voltage in the electric flocculation device is maintained at 15V when electrolysis is carried out, and the current density is 30A/m2The reaction time was 45 min.
Comparative example 3
A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the anodic oxidation dyeing wastewater into a pH value adjusting pool, and adjusting the pH value of the wastewater to 4 by using hydrochloric acid;
2) then pumping the wastewater adjusted by hydrochloric acid into an electric flocculation device for electric flocculation and electric oxidation reaction, adding an alkali regulator after the reaction is finished, and regulating the pH value of the electrolyzed wastewater to 9;
3) and pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding a flocculating agent polyacrylamide for coagulating sedimentation treatment, and finally discharging standard wastewater after passing through a filtering device.
The electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged in the lower part of the electrolytic tank, and the water outlet pipe is arranged on the upper part of the electrolytic tank. .
The voltage in the electric flocculation device is maintained at 15V when electrolysis is carried out, and the current density is 30A/m2The reaction time was 60 min.
The standard wastewater treated by the specific examples 1-5 and the standard wastewater treated by the comparative examples 1-3 were subjected to a total COD content test and a decolorization rate test, and the COD content test and analysis of the anodic dyeing wastewater of the specific examples 1-5 and the comparative examples 1-3 were carried out, and the results are shown in the following figures.
From the above results, it can be seen that the chroma and COD of the treated wastewater in examples 1-5 of the present invention are extremely low and meet the national regulations, and the method of the present invention has high efficiency of treating wastewater and no secondary pollution during the treatment process.
In comparison with comparative example 1, in example 1, the voltage was 15V and the current density was 30A/m when electrolysis was carried out in the electroflocculation apparatus2Electrolyzing for 30min, and performing chroma and COD tests on the standard wastewater treated in the example 1 to find that the chroma and COD values of the standard wastewater are obviously lower than those of the wastewater treated in the comparative example 1; the invention shows that the current density can not reach when the electrolysis is carried out in the electric flocculation device, and the flocculation and sedimentation of the waste water can be obviously improved after 30min of electrolysis.
Compared with the comparative example 2, the example 3 adds the flocculating agent sodium polyacrylate when the sedimentation tank is flocculated and settled, and the chroma and COD value of the standard wastewater treated by the example 3 are obviously lower than those of the wastewater treated by the comparative example 2 after the chroma and COD value are tested; the invention shows that the flocculation and sedimentation of the wastewater can be obviously improved by adding the flocculating agent sodium polyacrylate during the flocculation and sedimentation of the sedimentation tank.
In comparison with comparative example 3, example 5 adds coagulant AL at the time of flocculation and sedimentation in the sedimentation tank2(SO4)3The standard wastewater treated in the example 5 is subjected to chroma and COD tests, and the chroma and COD values of the standard wastewater are obviously lower than those of the standard wastewater treated in the comparative example 3; the invention is explained by adding coagulant AL when the sedimentation tank is flocculated and settled2(SO4)3Can obviously improve the flocculation and sedimentation of the wastewater.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (5)
1. A method for removing the chromaticity of anodic oxidation dyeing wastewater by electric flocculation comprises the following steps:
1) pumping the dyeing wastewater into a pH adjusting tank, and adjusting the pH value of the wastewater by using an acidity regulator;
2) then, pumping the wastewater regulated by the acidity regulator into an electric flocculation device for electric flocculation and electric oxidation reaction;
3) pumping the wastewater after the electrooxidation by the electroflocculation device into a sedimentation tank, adding alkali to adjust the pH value, adding a flocculating agent to perform coagulating sedimentation treatment, and finally discharging the wastewater with the color reaching the standard after passing through a filtering device;
the flocculating agent is at least one of sodium polyacrylate, calcium polyacrylate and polyacrylamide;
the electric flocculation device comprises a direct-current power supply, an electrolytic tank, an anode brush, through-hole plates, anode plates, cathode plates, aeration pipes, a water inlet pipe, a water outlet pipe and a shell, wherein the cathode plates are arranged inside the electrolytic tank, the anode brush is arranged in the through-hole plates, the through-hole plates are arranged between the anode plates, cathode and anode spacing plates are arranged between the anode plates and the corresponding cathode plates, the aeration pipes are arranged below the anode brush, the water inlet pipe is arranged at the lower part of the electrolytic tank, and the water outlet pipe is arranged at the upper part of the electrolytic tank; the anode brush is made of aluminum or iron;
the voltage is maintained at 20-25V and the current density is 65-100A/m when electrolysis is carried out in the electric flocculation device2The reaction time is 30-60 min.
2. The method for removing the chromaticity of the anodic oxidation dyeing wastewater by the electric flocculation of claim 1, which is characterized in that: the acidity regulator is sulfuric acid or hydrochloric acid.
3. The method for removing the chromaticity of the anodic oxidation dyeing wastewater by the electric flocculation of claim 1, which is characterized in that: in the step 1), the pH value of the waste water is adjusted to 2-4.
4. The method for removing the chromaticity of the anodic oxidation dyeing wastewater by the electric flocculation of claim 1, which is characterized in that: and (3) after the reaction is finished in the step 3), adding an alkaline regulator to regulate the pH value, and maintaining the pH value at 7-9.
5. The method for removing the chromaticity of the anodic oxidation dyeing wastewater by the electric flocculation of claim 1, which is characterized in that: in the step 3), the coagulation treatment time is 30-60 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811245346.2A CN109354134B (en) | 2018-10-24 | 2018-10-24 | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811245346.2A CN109354134B (en) | 2018-10-24 | 2018-10-24 | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109354134A CN109354134A (en) | 2019-02-19 |
| CN109354134B true CN109354134B (en) | 2021-10-08 |
Family
ID=65346624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811245346.2A Active CN109354134B (en) | 2018-10-24 | 2018-10-24 | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109354134B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112499848A (en) * | 2020-09-30 | 2021-03-16 | 东莞市三人行环境科技有限公司 | Electric flocculation silicon removal process and system for silicon-containing wastewater |
| CN112239295A (en) * | 2020-10-27 | 2021-01-19 | 广东江宇环保工程设备有限公司 | Electrophoretic painting wastewater pretreatment method |
| CN116216867B (en) * | 2023-05-06 | 2023-08-01 | 杭州水处理技术研究开发中心有限公司 | Anti-pollution enhanced electric flocculation water treatment device and application |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717162A (en) * | 2009-12-02 | 2010-06-02 | 厦门世达膜科技有限公司 | Method for treating and recycling wastewater generated by processing surface of aluminum profile |
| CN101792199A (en) * | 2010-02-26 | 2010-08-04 | 厦门市威士邦膜科技有限公司 | Sewage treatment technique |
| CN102701338A (en) * | 2012-06-25 | 2012-10-03 | 杨德敏 | Advanced treatment process for coking wastewater |
| CN103951139A (en) * | 2014-04-16 | 2014-07-30 | 文继庆 | Oilfield wastewater treatment process |
| CN105060580A (en) * | 2015-08-19 | 2015-11-18 | 北京京润新技术发展有限责任公司 | Method for treating heavy metal wastewater through electric flocculation-chemical precipitation |
| CN105130133A (en) * | 2015-09-29 | 2015-12-09 | 天津邦盛净化设备工程有限公司 | Treatment system and method for water-soluble paint production wastewater |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2212005Y (en) * | 1994-04-06 | 1995-11-08 | 四川拓昌高技术实业有限公司 | Continuous operation electrolytic device by electrochemical treating waste water |
| CN1278515A (en) * | 1999-06-18 | 2001-01-03 | 游清池 | Electrically catalytic flocculating waste water treating equipment with polar plate interval keeper |
| JP2001062460A (en) * | 1999-08-25 | 2001-03-13 | Matsushita Electric Ind Co Ltd | Circulation treatment device and cleaning method of electrode used for the same |
| CN1139542C (en) * | 2001-08-22 | 2004-02-25 | 黄援中 | Electric coagulation machine |
| SG131809A1 (en) * | 2005-10-28 | 2007-05-28 | Lee Thiam Seng | Advanced electro-coagulation device and process of using the same for wastewater treatment |
| CN101811757B (en) * | 2010-04-26 | 2013-11-06 | 中国科学院过程工程研究所 | Air-assisted electro-coagulation algae water separation device and using method thereof |
| CN202898089U (en) * | 2012-11-08 | 2013-04-24 | 常德力元新材料有限责任公司 | Electric flocculation device for electroplating wastewater treatment |
| CN104071871B (en) * | 2014-06-20 | 2015-07-22 | 张家港格林台科环保设备有限公司 | High-density electric flocculation device with slidable pole plates and use method thereof |
| CN104192953B (en) * | 2014-08-13 | 2015-09-02 | 东莞市东元新能源科技有限公司 | A kind of electricity flocculation wastewater treatment electrode |
| CN204356180U (en) * | 2014-12-18 | 2015-05-27 | 江苏润聚新材料科技有限公司 | There are the water treating equipment of fouling in advance of Automatic clearance function |
| CN205367828U (en) * | 2016-01-04 | 2016-07-06 | 苏州中晟环境修复股份有限公司 | Novel durable electricity flocculation device |
| CN105753106A (en) * | 2016-05-04 | 2016-07-13 | 山东海能环境技术有限公司 | Fully automatic sterilizing and descaling device for circulating water |
| CN205873974U (en) * | 2016-07-05 | 2017-01-11 | 天津鲁赫环保科技有限公司 | Novel board -like rotary electrode electricity flocculation electrolysis device |
| CN106915802B (en) * | 2017-04-12 | 2020-03-10 | 哈尔滨工业大学 | Integrated electrochemical reaction device for treating refractory organic wastewater and treatment method |
| CN107215929A (en) * | 2017-08-07 | 2017-09-29 | 深圳盖雅环境科技有限公司 | A kind of electric flocculation unit, electric flocculation device and heavy metal waste water treatment system |
| CN111704214A (en) * | 2020-07-01 | 2020-09-25 | 烟台大学 | Electrochemistry sewage treatment system |
-
2018
- 2018-10-24 CN CN201811245346.2A patent/CN109354134B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717162A (en) * | 2009-12-02 | 2010-06-02 | 厦门世达膜科技有限公司 | Method for treating and recycling wastewater generated by processing surface of aluminum profile |
| CN101792199A (en) * | 2010-02-26 | 2010-08-04 | 厦门市威士邦膜科技有限公司 | Sewage treatment technique |
| CN102701338A (en) * | 2012-06-25 | 2012-10-03 | 杨德敏 | Advanced treatment process for coking wastewater |
| CN103951139A (en) * | 2014-04-16 | 2014-07-30 | 文继庆 | Oilfield wastewater treatment process |
| CN105060580A (en) * | 2015-08-19 | 2015-11-18 | 北京京润新技术发展有限责任公司 | Method for treating heavy metal wastewater through electric flocculation-chemical precipitation |
| CN105130133A (en) * | 2015-09-29 | 2015-12-09 | 天津邦盛净化设备工程有限公司 | Treatment system and method for water-soluble paint production wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109354134A (en) | 2019-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Meas et al. | Industrial wastewaters treated by electrocoagulation | |
| WO2013156002A1 (en) | Nano catalyst electrolysis flocculation air flotation device | |
| CN109354134B (en) | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation | |
| CN110526346B (en) | Electrochemical anaerobic membrane biological sewage treatment device and treatment method thereof | |
| CN109485185B (en) | Pulse electrochemical treatment method and device for waste liquid of oil field operation | |
| CN102718349B (en) | Device and method for electrolytic treatment of acid organic wastewater with high salinity | |
| CN111410345A (en) | Method and system for treating comprehensive wastewater generated by anodic oxidation process | |
| KR20020059767A (en) | Method and apparatus for clarification of water | |
| CN104291415A (en) | Method for treating rolling emulsification wastewater through electrocoagulation | |
| CN101698523B (en) | Method for applying molded carbon in treatment of industrial waste water by electroflocculation | |
| El-Ashtoukhy et al. | Removal of heavy metal ions from aqueous solution by electrocoagulation using a horizontal expanded Al anode | |
| KR101221565B1 (en) | Electrolytic treatment of waste water | |
| KR20090047641A (en) | Wastewater treatment device by electroly-zation | |
| KR101339303B1 (en) | Flocculation and electrolysis using electricity fluoride concentration of nitrogen-containing merge handling | |
| CN105967405A (en) | Treating and recycling method of coal washing wastewater | |
| CN112520913A (en) | Pretreatment process for treating refractory organic wastewater by electric flocculation | |
| CN109305735A (en) | Defluorination method and defluorination system for flue gas desulfurization wastewater | |
| CN105016537A (en) | Plug flow type dual-electrode electrolysis air floater | |
| KR100372849B1 (en) | Advanced apparatus for treating wastewater using the electrolysis and coagulation | |
| CN107216006B (en) | Leather wastewater treatment system and method | |
| CN212127832U (en) | Desulfurization waste water electroflocculation coupling fenton oxidation standard-reaching treatment system | |
| CN109384358B (en) | Integrated denitrification filter tank with electric flocculation device | |
| CN212476408U (en) | Sewage treatment system | |
| CN210855619U (en) | Contain salt organic waste water electrocatalytic oxidation coupling preprocessing device | |
| CN211111206U (en) | Electric flocculation purifies little surface water device that pollutes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |