CN107324538B - Chromium-containing electroplating wastewater treatment method and treatment device - Google Patents
Chromium-containing electroplating wastewater treatment method and treatment device Download PDFInfo
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Abstract
The invention belongs to the technical field of electroplating wastewater treatment, and particularly discloses a method for treating electroplating wastewaterA method and a device for treating chromium-containing electroplating wastewater. The chromium-containing electroplating wastewater treatment device comprises an electroplating waste liquid storage tank, a chemical reaction tank, an adsorption tower, a recovery tank, a sulfuric acid tank and a precipitation tank, wherein the adsorption tower is filled with a strong-acid macroporous polymer resin layer containing sulfonic acid groups. In a chemical reaction tank, FeSO is used4·7H2The hexavalent chromium in the chromium-containing electroplating wastewater is reduced into trivalent chromium by O, and then the trivalent chromium is flocculated and precipitated and adsorbed by a strong acid macroporous polymer resin layer, so that the Cr in the electroplating wastewater can be simultaneously treated3+、Cr6+And the treatment efficiency is high due to the equal cation.
Description
Technical Field
The invention belongs to the technical field of electroplating wastewater treatment, and particularly relates to a method and a device for treating chromium-containing electroplating wastewater.
Background
Electroplating is a process of attaching a layer of metal film on the surface of a metal or other material workpiece by utilizing the electrolytic action, and can play a role in preventing corrosion, improving wear resistance, conductivity, light reflection and the like on a plated product. The plating is classified into chromium plating, copper plating, nickel plating, and the like according to the metal of the plating layer.
Chromium-containing wastewater is inevitably generated in the chromium electroplating process, the concentration of chromium ions in the wastewater is relatively high, and the chromium-containing electroplating wastewater belongs to carcinogenic, teratogenic and mutagenic highly toxic substances and causes great harm to living environments of human beings and other organisms. Therefore, treatment of chromium-containing electroplating wastewater is essential.
The traditional method for treating the chromium-containing electroplating wastewater mainly comprises the following steps: the chemical precipitation method, the chemical reduction method and the like can not recycle the hexavalent chromium ions, thereby causing resource waste. Although the method and apparatus for purifying hexavalent chromium electroplating waste liquid of Chinese patent CN102154681B can complete the treatment of electroplating waste liquid without dilution and concentration steps to achieve higher chromium recovery rate, the description in the specification mainly aims at Zn2+、Cu2+、Cr3+、Fe3+However using only the adsorbent resin costHigh content of Cr, limited adsorption amount, physical adsorption, and high content of Cr in resin eluate3+The toxic ions of (1) remain.
Disclosure of Invention
The invention provides a method and a device for treating chromium-containing electroplating wastewater, which solve the problems that only adsorption resin is used, the cost is high, the adsorption capacity is limited, the adsorption resin belongs to physical adsorption, and Cr still exists in resin eluent3+The problem of toxic ion residues.
The invention provides a chromium-containing electroplating wastewater treatment device, which comprises an electroplating wastewater storage tank, a chemical reaction tank, an adsorption tower and a recovery tank, wherein the adsorption tower is filled with a strongly acidic macroporous polymer resin layer containing sulfonic acid groups, the outlet of the electroplating wastewater storage tank is communicated with the inlet of the chemical reaction tank, the outlet of the chemical reaction tank is communicated with the inlet of the adsorption tower, and the outlet of the adsorption tower is communicated with the inlet of the recovery tank through pipelines, each pipeline is provided with a valve, a first flowmeter is further arranged on the pipeline communicated between the outlet of the chemical reaction tank and the inlet of the adsorption tower, a monitor is arranged on the electroplating wastewater storage tank, a feeding port is further arranged on the chemical reaction tank, a sulfuric acid inlet is further arranged at the upper end of the adsorption tower, and the sulfuric acid inlet is communicated with a sulfuric acid tank through a first sulfuric acid pipeline, the lower end of the adsorption tower is communicated with a precipitation tank through a second sulfuric acid pipeline, a second flowmeter and a first sulfuric acid valve are arranged on the first sulfuric acid pipeline, and a second sulfuric acid valve is arranged on the second sulfuric acid pipeline.
Preferably, the chemical reaction tank is provided with an observation port, a sampling port and a precipitation sewage outlet.
Preferably, in the chromium-containing electroplating wastewater treatment device, the upper end of the chemical reaction tank and the lower end of the recovery tank are communicated through a return pipeline, and a lift pump is arranged on the return pipeline.
The second purpose of the invention is to provide a treatment method of a chromium-containing electroplating wastewater treatment device, which comprises the following steps: s1, detecting chromium-containing electroplating wastewater in the electroplating waste liquid storage tank by using a monitorWhen the total chromium content reaches a certain concentration, a valve between the electroplating waste liquid storage tank and the chemical reaction tank is opened to make the chromium-containing electroplating waste water flow into the chemical reaction tank, the pH of the whole system is adjusted to 3-3.5 by using 30% sulfuric acid, and FeSO is added from a feeding port4·7H2O, stirring for 15-30min at the speed of 300r/min in 250-;
s2, closing a valve between the electroplating waste liquid storage tank and the chemical reaction tank, opening valves between an outlet of the chemical reaction tank and an inlet of the adsorption tower and between an outlet of the adsorption tower and an inlet of the recovery tank, adjusting a first flow meter, enabling effluent of the chemical reaction tank to flow through a strongly acidic macroporous polymer resin layer in the adsorption tower at a speed of 3-4BV/h for adsorption, and enabling the effluent to finally flow into the recovery tank;
s3, closing all valves, opening the first sulfuric acid valve and the second sulfuric acid valve, and passing 8% sulfuric acid through the strong acid macroporous polymer resin layer of the adsorption tower at the speed of 1-1.5BV/h to regenerate the strong acid macroporous polymer resin.
Preferably, in the above treatment method, S1, FeSO4·7H2The adding amount of O is 0.5-1.0g added in each liter of chromium-containing wastewater, and the adding amount of the polyaluminum ferric chloride is 0.01-0.05g added in each liter of chromium-containing wastewater.
Preferably, in the above treatment method, in S2, after a certain amount of liquid is collected in the recovery tank, the lift pump is turned on to transfer the liquid in the recovery tank to the chemical reaction tank, and after mixing with the chromium-containing wastewater, S1-S2 is repeated once or twice.
Preferably, in the treatment method, in step S3, the effluent of the adsorption tower is a regenerated waste liquid, the regenerated waste liquid flows into a precipitation tank, polyaluminum ferric chloride is added into the precipitation tank, after the addition is finished, the stirring is carried out at a speed of 150r/min for 5min, the stirring is finished, the standing is carried out for 1h, and the addition amount of the polyaluminum ferric chloride is 0.05g per liter of chromium-containing waste water.
Compared with the prior art, the chromium-containing electroplating wastewater treatment method and the chromium-containing electroplating wastewater treatment device provided by the invention have the following beneficial effects:
1. using FeSO4·7H2Reducing hexavalent chromium in chromium-containing electroplating wastewater into trivalent chromium by using O, and oxidizing iron ions into Fe3+Then adsorbing the Fe-containing iron oxide by using Lewatit K2620 type strong-acid macroporous polymer resin containing sulfonic acid group to remove Fe3+、Cr3+、Na+When the cation is equal, no other cation is introduced in the adsorption process, and SO is left4 2-After repeating the steps S1-S2 several times, the SO in the tank is recovered4 2-Accumulating, SO that the recycling rate of the chromium wastewater is improved, and SO in the electroplating wastewater can be supplemented4 2-And (4) content.
At the same time, Fe2+Is oxidized into Fe3+And is of Fe3+The flocculant is a common flocculant, in order to enhance the flocculation effect in an oxidation pond, the invention integrates two steps of oxidation reduction and flocculation into one tank for reaction, utilizes the product of the oxidation reduction reaction and flocculant polymeric aluminum ferric oxide to form a high-efficiency coagulant, and according to the synergistic principle, the polymeric aluminum ferric chloride and Fe3+The composite energy forms a novel high-efficiency coagulant, thereby having good flocculation effect on heavy metal pollutants in the chromium-containing wastewater.
2. The method and the device for treating the chromium-containing electroplating wastewater can simultaneously treat Cr in the electroplating wastewater3+、Cr6+No other dilution or concentration step is needed and the steps are simple and easy to operate. The adsorption effect shows that the content of cations such as zinc, copper, iron, chromium and the like in the chromium-containing wastewater is reduced by more than 93 percent, and SO4 2-The content is slightly increased.
3. The regenerated liquid after the strong acid macroporous polymer resin is regenerated by the sulfuric acid flows into a precipitation tank and is subjected to secondary flocculation precipitation, so that secondary pollution is avoided.
Drawings
FIG. 1 is a schematic view showing the structure of a chromium-containing electroplating wastewater treatment apparatus according to the present invention.
Description of reference numerals: 1. the device comprises an electroplating waste liquid storage tank, 2. a chemical reaction tank, 21. a feed inlet, 3. an adsorption tower, 31. a strong acid macroporous polymer resin layer, 32. a sulfuric acid inlet, 4. a recovery tank, 41. a lift pump, 5. a valve, 6. a first flowmeter, 7. a monitor, 8. a sulfuric acid tank, 81. a second flowmeter, 82. a first sulfuric acid valve, 9. a precipitation tank and 91. a second sulfuric acid valve.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments, but the invention should not be construed as being limited thereto. The test methods in the following examples, in which specific conditions are not specified, are generally conducted under conventional conditions. When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention relates to a chromium-containing electroplating wastewater treatment device, which is a Lewatit K2620 type strongly acidic macroporous polymer resin containing sulfonic acid groups, produced by Langshan Germany Limited company, is a kind of bead-shaped resin with sulfonic acid groups, and is only seen in the treatment of Cr3+The application of the chromium oxide is not seen in the treatment of Cr6+The application is as follows.
Example 1
In order to simultaneously treat Cr in electroplating wastewater3+、Cr6+The purpose of ions is that the application method of the resin is improved, and a chromium-containing electroplating wastewater treatment device is designed, specifically as shown in figure 1, the device comprises an electroplating waste liquid storage tank 1, a chemical reaction tank 2, an adsorption tower 3 and a recovery tank 4, wherein the adsorption tower is filled with a strong acid macroporous polymer resin layer 31 containing sulfonic acid groups, the outlet of the electroplating waste liquid storage tank 1 is communicated with the inlet of the chemical reaction tank 2, the outlet of the chemical reaction tank 2 is communicated with the inlet of the adsorption tower 3, the outlet of the adsorption tower 3 is communicated with the inlet of the recovery tank 4 through pipelines, each pipeline is provided with a valve 5, the outlet of the chemical reaction tank 2 is communicated with the inlet of the adsorption tower 3 through a valve 5, and the outlet of the chemical reaction tank 2 is communicated with the inlet of the adsorption towerStill be provided with first flowmeter 6 on the pipeline of intercommunication between, be provided with monitor 7 on the electroplating waste liquid storage tank 1, dog-house 21 has still been seted up on the chemical reaction groove 2, sulphuric acid entry 32 has still been seted up to adsorption tower 3 upper end, sulphuric acid entry 32 has sulphuric acid groove 8 through first sulphuric acid pipeline intercommunication, 3 lower extremes of adsorption tower have precipitation tank 9 through second sulphuric acid pipeline intercommunication, be provided with second flowmeter 81 and first sulphuric acid valve 82 on the first sulphuric acid pipeline, be provided with second sulphuric acid valve 91 on the second sulphuric acid pipeline.
And the chemical reaction tank 2 is provided with an observation port, a sampling port and a precipitation sewage draining port, so that the chemical reaction condition can be observed, sampled and detected conveniently, and the precipitation and the discharge are facilitated. The outlet of the chemical reaction tank 2 is provided with a filter screen, the aperture of the filter screen is reasonably adjusted to about 80 meshes as required, and the filter screen plays a role in filtering.
In order to achieve the circulation effect, the upper end of the chemical reaction tank 2 and the lower end of the recovery tank 4 are communicated through a return pipe, and a lift pump 41 is arranged on the return pipe.
It should be noted that the monitor 7 may be any metal ion online monitor in the prior art, for example, a Testomat2000 online water quality photometer for detecting Fe3+、Cr6+YJ-Zn type zinc ion online monitor of Tianjin Youmei environmental protection technology Limited corporation2+Shenyang Qiangfeng Xinghe electronic instrument, Inc. MD-5000Cr for detecting total Cr and Cr3+、Cr6+。
Example 2
Based on the same invention concept, the invention also provides a method for treating chromium-containing electroplating wastewater by using the device, which comprises the following steps:
s1, the electroplating waste liquid storage tank 1 is used for storing chromium-containing electroplating waste water to be treated, the total chromium content of the chromium-containing electroplating waste water in the electroplating waste liquid storage tank 1 is detected by using a monitor 7, when the total chromium content exceeds 8g/L, a valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2 is opened, the waste water flows into the chemical reaction tank 2, the pH of the whole system is adjusted to be 3-3.5 by using sulfuric acid with the volume fraction of 30%, and FeSO is added from a feeding port 214·7H2O at 260r/min for 20min, adding NaOH into the chemical reaction tank 2 from a feeding port 21 after stirring is finished, adjusting the pH value of the whole system to be 6.5-7.0, adding polyaluminum ferric chloride into the system, stirring the system for 5min at a speed of 150r/min after the adding is finished, standing the system for 1h after stirring is finished, and discharging water through an outlet of the chemical reaction tank 2 to obtain effluent of the chemical reaction tank;
the FeSO4·7H2The adding amount of O is 0.5g added into each liter of chromium-containing wastewater, and the adding amount of the polyaluminum ferric chloride is 0.01g added into each liter of chromium-containing wastewater;
s2, closing a valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2, opening valves between an outlet of the chemical reaction tank 2 and an inlet of the adsorption tower 3 and between an outlet of the adsorption tower 3 and an inlet of the recovery tank 4, adjusting a first flow meter 6 to enable effluent of the chemical reaction tank to flow through the adsorption tower 3 at a speed of 3BV/h, and enabling the strong-acid macroporous polymer resin layer 31 in the adsorption tower 3 to react with Fe3+、Cr3+When the cation is adsorbed, the effluent finally flows into the recovery tank 4.
S3, closing all valves 5, opening the first sulfuric acid valve 82 and the second sulfuric acid valve 91, and allowing sulfuric acid with a volume fraction of 8% to pass through the strong-acid macroporous polymer resin layer 31 of the adsorption tower 3 at a speed of 1BV/h to regenerate the strong-acid macroporous polymer resin, so that the strong-acid macroporous polymer resin can be conveniently used in the next step;
and then the regenerated waste liquid flows out of the adsorption tower 3, the regenerated waste liquid flows into a precipitation tank 9, polyaluminum ferric chloride is added into the precipitation tank 9, the mixture is stirred for 5min at the speed of 150r/min after the addition is finished, the mixture is kept stand for 1h after the stirring is finished, the adding amount of the polyaluminum ferric chloride is 0.05g per liter of chromium-containing waste water, heavy metal ions in the regenerated liquid are treated, and secondary pollution is avoided.
Example 3
Based on the same invention concept, the invention also provides a method for treating chromium-containing electroplating wastewater by using the device, which comprises the following steps:
s1, detecting the total chromium content of the chromium-containing electroplating wastewater in the electroplating waste liquid storage tank 1 by using a monitor 7, and opening the electroplating waste liquid storage tank when the total chromium content exceeds 10g/LA valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2 enables the waste water to flow into the chemical reaction tank 2, the pH of the whole system is adjusted to 3-3.5 by using sulfuric acid with the volume fraction of 30%, and FeSO is added from a feeding port 214·7H2O, stirring for 15min at the speed of 300r/min, adding NaOH into the chemical reaction tank 2 from a feeding port 21 after stirring is finished, adjusting the pH value of the whole system to be 6.5-7.5, adding polyaluminum ferric chloride into the system, stirring for 3min at the speed of 200r/min after the adding is finished, standing for 1h after stirring is finished, and discharging water through an outlet of the chemical reaction tank 2 to obtain effluent of the chemical reaction tank;
the FeSO4·7H2Adding 1.0g of O into each liter of chromium-containing wastewater, and adding 0.05g of polyaluminum ferric chloride into each liter of wastewater;
s2, closing a valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2, opening valves between an outlet of the chemical reaction tank 2 and an inlet of the adsorption tower 3 and between an outlet of the adsorption tower 3 and an inlet of the recovery tank 4, adjusting a first flow meter 6 to enable effluent of the chemical reaction tank to flow through the adsorption tower 3 at a speed of 3.5BV/h, and enabling a strong-acid macroporous polymer resin layer 31 in the adsorption tower 3 to react with Fe3+、Cr3+When the cation is adsorbed, the effluent finally flows into the recovery tank 4.
In order to improve the efficiency of the precipitation and adsorption treatment, after a certain amount of liquid is collected in the recovery tank 4, the lift pump 41 is turned on to transfer the liquid in the recovery tank 4 to the chemical reaction tank 2, and after the liquid is mixed with the chromium-containing wastewater, the cycle of S1-S2 is repeated twice;
s3, closing all valves 5, opening the first sulfuric acid valve 82 and the second sulfuric acid valve 91, and allowing sulfuric acid with a volume fraction of 8% to pass through the strong-acid macroporous polymer resin layer 31 of the adsorption tower 3 at a speed of 1.5BV/h to regenerate the strong-acid macroporous polymer resin for the next utilization;
and at the moment, the regenerated waste liquid flows out of the adsorption tower 3, the regenerated waste liquid flows into a precipitation tank 9, polyaluminum ferric chloride is added into the precipitation tank, the solution is stirred for 5min at the speed of 150r/min after the addition is finished, the solution is kept stand for 1h after the stirring is finished, and the adding amount of the polyaluminum ferric chloride is that 0.05g of heavy metal ions in the regenerated liquid is added into each liter of chromium-containing waste water to treat, so that the secondary pollution is avoided.
Example 4
Based on the same invention concept, the invention also provides a method for treating chromium-containing electroplating wastewater by using the device, which comprises the following steps:
s1, detecting the total chromium content of the chromium-containing electroplating wastewater in the electroplating waste liquid storage tank 1 by using a monitor 7, opening a valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2 when the total chromium content exceeds 9g/L, enabling the wastewater to flow into the chemical reaction tank 2, adjusting the pH of the whole system to 3-3.5 by using sulfuric acid with the volume fraction of 30%, and then adding FeSO from a feeding port 214·7H2O, stirring for 30min at the speed of 250r/min, adding NaOH into the chemical reaction tank 2 from a feeding port 21 after stirring is finished, adjusting the pH value of the whole system to 7-7.5, adding polyaluminum ferric chloride into the system, stirring for 5min at the speed of 150r/min after the adding is finished, standing for 1h after stirring is finished, and discharging water through an outlet of the chemical reaction tank 2 to obtain effluent of the chemical reaction tank;
the FeSO4·7H2The adding amount of O is 0.5g added into each liter of chromium-containing wastewater, and the adding amount of the polyaluminum ferric chloride is 0.02g added into each liter of wastewater;
s2, closing a valve between the electroplating waste liquid storage tank 1 and the chemical reaction tank 2, opening valves between an outlet of the chemical reaction tank 2 and an inlet of the adsorption tower 3 and between an outlet of the adsorption tower 3 and an inlet of the recovery tank 4, adjusting a first flow meter 6 to enable effluent of the chemical reaction tank to flow through the adsorption tower 3 at a speed of 4BV/h, and enabling a strong-acid macroporous polymer resin layer 31 in the adsorption tower 3 to react with Fe3+、Cr3+When the cation is adsorbed, the effluent finally flows into the recovery tank 4.
In order to improve the efficiency of precipitation and adsorption treatment, after a certain amount of liquid is collected in the recovery tank 4, the lift pump 41 is turned on, the liquid in the recovery tank 4 is sent to the chemical reaction tank 2, and after the liquid is mixed with the chromium-containing wastewater, S1-S2 is repeated once;
s3, closing all valves 5, opening the first sulfuric acid valve 82 and the second sulfuric acid valve 91, and allowing sulfuric acid with a volume fraction of 8% to pass through the strong-acid macroporous polymer resin layer 31 of the adsorption tower 3 at a speed of 1.2BV/h to regenerate the strong-acid macroporous polymer resin for the next utilization;
and at the moment, the regenerated waste liquid flows out of the adsorption tower 3, the regenerated waste liquid flows into a precipitation tank 9, polyaluminum ferric chloride is added into the precipitation tank, the solution is stirred for 5min at the speed of 150r/min after the addition is finished, the solution is kept stand for 1h after the stirring is finished, the adding amount of the polyaluminum ferric chloride is 0.05g per liter of chromium-containing waste water, heavy metal ions in the regenerated liquid are treated, and secondary pollution is avoided.
In the chromium electroplating process, the used chromic anhydride contains less sulfate radicals, and the precipitation of chromium is facilitated due to the existence of a small amount of reasonable sulfate radicals. The sulfate radical in the chromium plating solution can generate complex chromium sulfate cation with trivalent chromium in the solution. Because of the strong oxidizing property of chromic acid, a passive film is easily formed on the surface of the plated part to block the formation of an electroplated layer, and the chromic acid heel presents negative ions, so that the chromic acid heel can not contact the surface of the plated part under the action of an electric field. Due to SO4 2-Complex cations are generated, the cations are leaked to the cathode under the action of an electric field to promote the dissolution of the basic chromium chromate film (passivation film), and chromate ions can be discharged on the cathode to precipitate metal chromium. However, the chromium plating is heated to about 60 ℃ and generates gas, which causes the volatilization loss of the solution, and water is frequently added for supplement if SO in the supplemented aqueous solution4 2-The content is insufficient.
FeSO that we added in chemical reaction tank 24·7H2O and sulfuric acid can not only convert Cr6+Reduction to Cr3+Remaining SO4 2-The Cr in the chromium waste water flows through the strong acid macroporous polymer resin layer 31 along with the chromium waste water3+When the positive ions are adsorbed, the residual Fe in the chemical reaction tank3+、Cr3+Allowing cations to flow through the adsorption tower 3 for adsorption, and leaving SO4 2-After repeating the steps S1-S2 several times, the SO in the collection tank 4 is recovered4 2-Accumulating, SO that the recycling rate of the chromium wastewater is improved, and SO in the electroplating wastewater can be supplemented4 2-And (4) content. At the same time, Fe2+Is oxidized into Fe3+And is of Fe3+Is a common flocculant, and a certain amount of polyaluminum ferric chloride and Fe are added into an oxidation tank in order to enhance the flocculation effect in the oxidation tank3+Used in combination, according to the synergistic principle, the polyaluminum ferric chloride and the Fe3+The composite energy forms a novel high-efficiency coagulant, thereby having good flocculation effect on heavy metal pollutants in the chromium-containing wastewater.
Adsorption effect experiment:
chromium electroplating wastewater from two factories is treated according to the method of example 2, the liquid in the recovery tank 4 is collected, and then chromic anhydride (HCrO) in the electroplating wastewater before and after treatment is detected by spectrophotometry4 -)、Fe3+、Cr6+、Cr3+、SO4 2-、Na+、Ni+、Cu2+、Zn2+The results are shown in Table 1. The adsorption effect shows that the content of cations such as zinc, copper, iron, chromium and the like in the chromium-containing wastewater is reduced by over 93 percent.
TABLE 1 concentration of each ion (g/L)
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The chromium-containing electroplating wastewater treatment device is characterized by comprising an electroplating waste liquid storage tank (1), a chemical reaction tank (2), an adsorption tower (3) and a recovery tank (4), wherein a strongly acidic macroporous polymer resin layer (31) containing sulfonic acid groups is filled in the adsorption tower, an outlet of the electroplating waste liquid storage tank (1) is communicated with an inlet of the chemical reaction tank (2), an outlet of the chemical reaction tank (2) is communicated with an inlet of the adsorption tower (3), an outlet of the adsorption tower (3) is communicated with an inlet of the recovery tank (4) through pipelines, each pipeline is provided with a valve (5), a first flow meter (6) is further arranged on the pipeline communicated between the outlet of the chemical reaction tank (2) and the inlet of the adsorption tower (3), and the electroplating waste liquid storage tank (1) is provided with a monitor (7), a feeding port (21) is further formed in the chemical reaction tank (2), a sulfuric acid inlet (32) is further formed in the upper end of the adsorption tower (3), the sulfuric acid inlet (32) is communicated with a sulfuric acid tank (8) through a first sulfuric acid pipeline, the lower end of the adsorption tower (3) is communicated with a precipitation tank (9) through a second sulfuric acid pipeline, a second flowmeter (81) and a first sulfuric acid valve (82) are arranged on the first sulfuric acid pipeline, and a second sulfuric acid valve (91) is arranged on the second sulfuric acid pipeline;
the upper end of the chemical reaction tank (2) is communicated with the lower end of the recovery tank (4) through a return pipeline, and a lift pump (41) is arranged on the return pipeline;
the method for treating the chromium-containing electroplating wastewater by using the device comprises the following steps: s1, detecting the total chromium content of the chromium-containing electroplating wastewater in the electroplating waste liquid storage tank (1) by using a monitor (7), opening a valve between the electroplating waste liquid storage tank (1) and the chemical reaction tank (2) when the total chromium content reaches a certain concentration, enabling the chromium-containing electroplating wastewater to flow into the chemical reaction tank (2), adjusting the pH of the whole system to be 3-3.5 by using 30% sulfuric acid, and then adding FeSO from a feeding port (21)4·7H2O, stirring for 15-30min at the speed of 300r/min of 250-;
s2, closing a valve between the electroplating waste liquid storage tank (1) and the chemical reaction tank (2), opening valves between an outlet of the chemical reaction tank (2) and an inlet of the adsorption tower (3) and between an outlet of the adsorption tower (3) and an inlet of the recovery tank (4), adjusting a first flow meter (6), enabling effluent of the chemical reaction tank to flow through a strongly acidic macroporous polymer resin layer (31) in the adsorption tower (3) at a speed of 3-4BV/h for adsorption, and enabling the effluent to finally flow into the recovery tank (4);
s3, closing all valves (5), opening a first sulfuric acid valve (82) and a second sulfuric acid valve (91), and passing 8% sulfuric acid through the strongly acidic macroporous polymer resin layer (31) of the adsorption tower (3) at the speed of 1-1.5BV/h to regenerate the strongly acidic macroporous polymer resin.
2. The chromium-containing electroplating wastewater treatment device as claimed in claim 1, wherein the chemical reaction tank (2) is provided with an observation port, a sampling port and a precipitation sewage outlet.
3. The chromium-containing electroplating wastewater treatment apparatus as claimed in claim 1, wherein in S1, FeSO is added4·7H2The adding amount of O is 0.5-1.0g added in each liter of chromium-containing wastewater, and the adding amount of the polyaluminum ferric chloride is 0.01-0.05g added in each liter of chromium-containing wastewater.
4. The apparatus for treating chromium-containing electroplating wastewater as claimed in claim 1, wherein in S2, after a certain amount of liquid is collected in the recovery tank (4), the lift pump (41) is turned on to transfer the liquid in the recovery tank (4) to the chemical reaction tank (2), and after mixing with the chromium-containing wastewater, the steps S1-S2 are repeated one to two times.
5. The chromium-containing electroplating wastewater treatment device according to claim 1, wherein in S3, the effluent of the adsorption tower (3) is regenerated waste liquid, the regenerated waste liquid flows into the precipitation tank (9), polyaluminum ferric chloride is added into the precipitation tank (9), after the addition is finished, the stirring is carried out at the speed of 150r/min for 5min, the stirring is finished, the standing is carried out for 1h, and the addition amount of the polyaluminum ferric chloride is 0.05g per liter of chromium-containing wastewater.
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| CN101560028A (en) * | 2009-05-25 | 2009-10-21 | 广州市市政工程设计研究院 | Sewage physicochemical treatment method and device |
| CN102154681A (en) * | 2011-05-06 | 2011-08-17 | 邱峰 | Method for purifying hexavalent chromium electroplating waste liquid and device |
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| CN101269871A (en) * | 2008-04-23 | 2008-09-24 | 南京大学 | Method for processing chrome wastewater |
| CN101560028A (en) * | 2009-05-25 | 2009-10-21 | 广州市市政工程设计研究院 | Sewage physicochemical treatment method and device |
| CN102154681A (en) * | 2011-05-06 | 2011-08-17 | 邱峰 | Method for purifying hexavalent chromium electroplating waste liquid and device |
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