CN110683684B - Electroplating copper-containing sewage treatment system and treatment process - Google Patents

Electroplating copper-containing sewage treatment system and treatment process Download PDF

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Publication number
CN110683684B
CN110683684B CN201911095615.6A CN201911095615A CN110683684B CN 110683684 B CN110683684 B CN 110683684B CN 201911095615 A CN201911095615 A CN 201911095615A CN 110683684 B CN110683684 B CN 110683684B
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copper
tank
pipeline
cyanogen breaking
regulating
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CN110683684A (en
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霍小平
张翠红
葛媛
武毛妮
朱艳芳
张同同
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Xijing University
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Xijing University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/26—Treatment of water, waste water, or sewage by extraction
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

The invention relates to the technical field of sewage treatment, in particular to an electroplating copper-containing sewage treatment system and a treatment process, which comprise a first filter tank, a first regulating tank and a first copper separation and extraction machine, wherein the first filter tank, the first regulating tank and the first copper separation and extraction machine are sequentially communicated through a pipeline; the second copper separating and extracting machine is sequentially communicated with a second regulating tank, a second filtering tank, an adsorption tank and a water storage tank through pipelines. The invention realizes the comprehensive removal of heavy metal ions, recycles copper ions and obtains water which can be directly recycled.

Description

Electroplating copper-containing sewage treatment system and treatment process
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a system and a process for treating electroplating copper-containing sewage.
Background
The copper plating layer is usually used as a bottom layer for nickel plating, tin plating, chromium plating, silver plating and gold plating to improve the binding force between a base metal and a surface plating layer and the corrosion resistance of the plating layer, so that the copper-containing electroplating wastewater is very common in the electroplating industry, the quality of the electroplating wastewater is relatively complex, the wastewater contains heavy metal ions such as chromium, zinc, copper, nickel and cadmium and sundries such as acid, alkali and cyanide with high toxicity, the treatment difficulty is high, and the environmental pollution is serious.
A large amount of copper ions in the copper-containing sewage exist in the form of copper cyanide complex ions, and a large amount of OH is often added into mixed liquor in the treatment process of the electroplating copper-containing sewage in the prior art-Not only corrodes the device, but also the copper ions are not thoroughly removed, so that the water after sewage treatment can not be recycled and needs to be recycledAnd (5) secondary treatment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a process for treating the electroplating copper-containing sewage.
In order to solve the technical problems, the invention adopts the following technical scheme:
the system comprises a first filter tank, a first regulating tank and a first copper separation and extraction machine, wherein the first filter tank, the first regulating tank and the first copper separation and extraction machine are sequentially communicated through a pipeline;
and the second copper separation and extraction machine is sequentially communicated with a second regulating tank, a second filtering tank, an adsorption tank and a water storage tank through pipelines.
Preferably, from the top down has set gradually coarse strainer, fine filter screen and tubular milipore filter in the filtering ponds, the coarse strainer the aperture of fine filter screen and tertiary tubular milipore filter reduces in proper order, on the filtering ponds, be located coarse strainer top department is provided with the sewage entry.
Preferably, the first adjusting tank is connected with a first doser through a pipeline, the cyanogen breaking tank is connected with a second doser through a pipeline, and the second adjusting tank is connected with a third doser through a pipeline.
Preferably, separate for upper region and lower region by the diaphragm in the electrolytic cell, be provided with a plurality of electric heating pipe side by side in the lower region, be provided with circulating pump and temperature sensor in the upper region.
Preferably, pH detectors are arranged in the second regulating tank, the cyanogen breaking tank, the first regulating tank and the electrolytic tank, and redox regulators are arranged in the second regulating tank, the cyanogen breaking tank and the regulating tank; an aeration pipeline is arranged at the inner bottom of the cyanogen breaking pool, one end of the aeration pipeline penetrates through the side wall of the cyanogen breaking pool and extends outwards, an air inlet pump is fixedly connected to the end part of the aeration pipeline, and aeration holes are formed in the aeration pipeline and located in the cyanogen breaking pool.
Preferably, a first pressure pump is arranged between the first regulating reservoir and the first copper extraction separator, a second pressure pump is arranged between the cyanogen breaking reservoir and the second copper extraction separator, a lifting pump is arranged between the second regulating reservoir and the second filtering reservoir, a controller and a control panel are arranged on the side wall of the adsorption pool, a display screen and a control switch are arranged on the control panel, the controller is respectively connected with the control panel, the air inlet pump, the oxidation-reduction regulator, the pH detector, the first pressure pump, the second pressure pump, the lifting pump, the electric heating pipe, the temperature sensor and the circulating pump, and the controller is electrically connected with a power supply.
Preferably, be provided with the adsorption tube in the adsorption tank, the adsorption tube is in be bow-shaped arrangement in the adsorption tank, just the adsorption tube intussuseption is filled with zeolite or medical stone that is used for adsorbing remaining heavy metal ion.
The invention also provides a process for treating sewage by the electroplating copper-containing sewage treatment system, which comprises the following steps:
step 1, carrying out rough filtration, fine filtration and ultrafiltration on the electroplating copper-containing sewage in the filter tank, collecting obtained filtrate in the first regulating tank, and regulating the pH value of the electroplating copper-containing sewage to 6-7;
step 2, conveying the sewage in the regulating reservoir to a first copper extraction separator for extracting copper ions through a first pressure pump through a conveying pipeline, discharging the waste water containing the copper-cyanogen complex into a cyanogen breaking tank after extraction, regulating the pH value in the cyanogen breaking tank to 7-9, then adding a cyanogen breaking agent into the cyanogen breaking tank, conveying the waste water after cyanogen breaking to a second copper extraction separator through a second pressure pump after cyanogen breaking is finished, respectively obtaining waste water and copper ion separation liquid, combining the copper ion separation liquid obtained by the first copper extraction separator and the copper ion separation liquid obtained by the second copper extraction separator, conveying the copper ion separation liquid to a back extraction separator through a pipeline together, back-extracting the copper ions in the back extraction separator, introducing the copper ions obtained by back extraction into the electrolytic cell through a pipeline, and regulating the pH value in the electrolytic cell to 3-5, circulating the electrolyte at a constant temperature, and electrolyzing copper ions to obtain a copper plate;
and 3, discharging the wastewater obtained in the step 2 into the second regulating tank, adding a heavy metal capture agent, discharging the wastewater into the second filtering tank through a lifting pump after heavy metal capture is finished, filtering, discharging filtrate into the adsorption tank, adsorbing residual trace heavy metals, and finally introducing the treated water into the storage tank for recycling.
Compared with the prior art, the invention has the beneficial effects that:
1. in electroplating copper-containing wastewater, copper ions tend to exist in complex form, such as copper cyanide complex [ Cu (CN)2]-、[Cu(CN)3]2-、[Cu(CN)4]3-It is believed that the copper cyanide complex ion in the wastewater is mainly [ Cu (CN)3]2-In the method, after rough filtration, fine filtration and ultrafiltration are carried out on the cyanide copper-plating bleaching agent wastewater by a filter tank, the obtained filtrate is firstly subjected to copper ion extraction by a first copper separation and extraction machine, copper cyanide complex ions enter a cyanide breaking tank along with the waste liquid, then a cyanide breaking agent is added into the cyanide breaking tank, copper ions in a complex are released to form free copper ions, so that the extraction is carried out by a second copper separation and extraction machine, the copper ion separation liquids obtained by the two extractions are combined and then subjected to back extraction in a back extraction separator, and finally the sewage is subjected to back extraction by a back extraction separatorCopper ion in is concentrated together, and let in and carry out the electrolysis of copper ion in the electrolytic bath, and deposit out copper at the negative pole, make copper carry out recycle, and still contain other heavy metal ion in the sewage that has been removed copper ion completely, other heavy metal gets into the second equalizing basin earlier, and carry out the seizure of heavy metal through the heavy metal trapping agent, and form flocculent deposit, can also adjust the pH of solution to neutrality at the second equalizing basin simultaneously, then filter in the second filtering basin, then the water after will filtering gets into in the adsorption tank, and adsorb through zeolite or medical stone in the adsorption tank, zeolite or medical stone have the large aperture, can adsorb remaining copper ion and the remaining organic ion that does not take place the flocculation in aquatic, and adsorption efficiency reaches more than 95%, let in at last and store sewage in the storage tank.
2. The preparation process of the invention is carried out 3 times of pH adjustment, the first time of pH adjustment is in a first adjusting tank, the purpose is to adjust the copper-containing sewage to be neutral, the second time of pH adjustment is in a cyanogen breaking tank, the purpose is to ensure that the activity of a cyanogen breaking agent is highest, the adjusted pH is 7-9, the third time of pH adjustment is in a second adjusting tank, the discharged water is neutral, and the alkalinity or acidity is not enhanced after the third time of pH adjustment, thereby effectively protecting sewage treatment devices.
Drawings
FIG. 1 is a flow chart of the treatment and recycling process of electroplating copper-containing sewage according to the present invention;
FIG. 2 is a cross-sectional view of the internal structure of the copper-containing electroplating wastewater treatment and reuse process according to the present invention;
FIG. 3 is a schematic diagram of the external structure of an adsorption tank for treating and recycling electroplating copper-containing sewage according to the present invention.
Description of reference numerals:
1. a filtration tank; 2. a first conditioning tank; 3. a first copper separating and extracting machine; 4. a cyanogen breaking pool; 5. a second copper separating and extracting machine; 6. a back extraction separator; 7. an electrolytic cell; 8. a second regulating reservoir; 9. an adsorption tank; 10. a water storage tank; 11. coarse filtration; 12. a fine filter screen; 13. a tubular ultrafiltration membrane; 14. a sewage inlet; 15. an adsorption pipeline; 16. a transverse plate; 17. an electric heating tube; 18. a circulation pump; 19. an aeration pipe; 20. an intake pump; 21. a first doser; 22. a second doser; 23. a third doser; 24. a second filtration tank; 25. a first pressure pump; 26. a second pressure pump; 27. a lift pump; 28. a controller; 29. a control panel.
Detailed Description
The following description of the preferred embodiments and accompanying fig. 1-3 will be made in detail with reference to the accompanying drawings.
The utility model provides an electroplate copper-containing sewage treatment system, includes first filtering ponds 1, first equalizing basin 2 and first copper separation extraction machine 3, will first filtering ponds 1 first equalizing basin 2 reaches all communicate in proper order through the pipeline between the first copper separation extraction machine 3, and first filtering ponds 1 is used for filtering impurity, macromolecular organic matter and colloid in the copper-containing sewage of electroplating, from the top down has set gradually coarse strainer 11, fine filter screen 12 and tubular milipore filter 13 in filtering ponds 1, coarse strainer 11, fine filter screen 12 and the aperture of tubular milipore filter 13 reduces in proper order, the aperture of coarse strainer 11 is 0.1-1mm, the aperture of fine filter screen 12 is 0.1-1 μm, the milipore diameter of the milipore filter in tubular milipore filter 13 is 0.1 μm, filtering ponds 1 is last, be located coarse strainer 11 top department is provided with sewage entry 14, the sewage enters the first filtering tank 1 from the sewage inlet 14, the first adjusting tank 2 is connected with a first chemical adding device 21 through a pipeline, acid liquor or alkali liquor is arranged in the first chemical adding device 21, the first adjusting tank 2 is used for adjusting the pH value of the copper-containing sewage and enabling the copper-containing sewage to be neutral so as to facilitate the following treatment, the first copper separating and extracting machine 3 is used for extracting copper ions in the copper-containing sewage and enabling the copper ions in the copper-containing sewage to be separated from the sewage, the first copper separating and extracting machine 3 is respectively communicated with a cyanogen breaking tank 4 and a back extraction separator 6, after the first copper separating and extracting machine 3 separates the copper ions, the sewage containing copper-cyanogen complex ions is brought into the cyanogen breaking tank 4, the cyanogen breaking tank 4 is connected with a second chemical adding device 22 through a pipeline, the second chemical adding device 22 is internally provided with a cyanogen breaking agent, and the copper-cyanogen complex ions are dissociated by adding the cyanogen breaking agent into the cyanogen breaking tank 4, an aeration pipeline 19 is arranged at the inner bottom of the cyanogen breaking pool 4, one end of the aeration pipeline 19 penetrates through the side wall of the cyanogen breaking pool 4 and extends outwards, an air inlet pump 20 is fixedly connected to the end part of the aeration pipeline 20, an aeration hole is formed in the aeration pipeline 19 positioned in the cyanogen breaking pool 4, air enters the cyanogen breaking pool 4 through the air inlet pump 20, a cyanogen breaking agent in the cyanogen breaking pool 4 is fully mixed with copper cyanogen complex ions, the cyanogen breaking efficiency is improved, copper ions in the copper cyanogen complex ions are dissociated, a second copper separating and extracting machine 5 is connected to the cyanogen breaking pool 4, the dissociated copper ions are extracted through the second copper separating and extracting machine 5, the copper ions are enriched to obtain a copper ion separating liquid, the second copper separating and extracting machine 5 is further communicated with a back-extraction separator 6, an electrolysis pool 7 is further connected to the back-extraction separator 6 through a pipeline, and the copper ion separating liquid obtained by extraction of the first copper separating and extracting machine 3 and the second copper separating and extracting machine 5 is subjected to electrolysis Combining, performing back extraction in a back extraction separator, finally concentrating copper ions in the sewage together, introducing the concentrated copper ions into an electrolytic cell 7 for electrolysis of the copper ions, and precipitating copper at a cathode so as to recycle the copper;
the electrolytic cell 7 is divided into an upper area and a lower area by a transverse plate 16, a plurality of electric heating pipes 17 are arranged in the lower area side by side, a circulating pump 18 and a temperature sensor are arranged in the upper area, the temperature sensor is used for sensing the temperature of the electrolyte in the electrolytic cell 7, the electric heating pipes 17 are used for keeping the electrolyte at a certain temperature, the circulating pump 18 enables the electrolyte to be mixed, and the uniform distribution of copper ions in the electrolyte is ensured; pH detectors are arranged in the second adjusting tank 8, the cyanogen breaking tank 4, the first adjusting tank 2 and the electrolytic tank 7, redox regulators are further arranged in the second adjusting tank 8, the cyanogen breaking tank 4 and the adjusting tank 2, the pH in the device is detected through the pH detectors, the pH is adjusted, redox points are detected through the redox regulators, and accordingly the amount of cyanogen breaking agents and heavy metal capture agents is determined.
The second copper separating and extracting machine 5 is sequentially communicated with a second regulating tank 8, a second filtering tank 24, an adsorption tank 9 and a water storage tank 10 through pipelines, the second regulating tank 8 is connected with a third doser 23 through a pipeline, a heavy metal capturing agent is arranged in the third doser 23, the second regulating tank 8 is used for capturing residual heavy metal through the heavy metal capturing agent, and flocculent precipitate is formed, and simultaneously the pH value of the solution can be adjusted to be neutral in the second adjusting tank 8, then the flocculent precipitate is filtered in a second filtering tank 9, the treated wastewater is introduced into an adsorption tank 9, an adsorption pipeline 15 is arranged in the adsorption tank 9, the adsorption pipeline 15 is arranged in the adsorption tank in an arched shape, and the adsorption pipeline 15 is filled with zeolite or medical stone for adsorbing residual heavy metal ions, and the residual heavy metal ions are adsorbed by the zeolite or medical stone.
A first pressure pump 25 is arranged between the first adjusting tank 2 and the first copper extraction separator 3, a second pressure pump 26 is arranged between the cyanogen breaking tank 4 and the second copper extraction separator 5, a lifting pump 27 is arranged between the second adjusting tank 8 and the second filtering tank 24, the first pressure pump 25, the second pressure pump 26 and the lifting pump 27 are all used for controlling the discharge of sewage, a controller 28 and a control panel 29 are arranged on the side wall of the adsorption tank 6, a display screen and a control switch are arranged on the control panel 29, the controller 28 is respectively electrically connected with the control panel 29, the air inlet pump 20, the oxidation-reduction regulator, the pH detector, the first pressure pump 25, the second pressure pump 26, the lifting pump 27, the electric heating pipe 23, the temperature sensor and the circulating pump 24, the controller 28 is electrically connected with a power supply, the controller 28 controls the electrical loads.
In the process of treating the copper-containing electroplating sewage, firstly, filtering the copper-containing electroplating sewage by a coarse filter screen 11, a fine filter screen 13 and a tubular ultrafiltration membrane 13 from a filter tank 1, collecting the obtained filtrate into a first regulating tank 2, and adding acid liquor or alkali liquor into the filter tank 1 through a first chemical adding device 21 to regulate the pH value of the copper-containing electroplating sewage to 6-7; then conveying the sewage in the regulating tank 2 into a first copper extraction separator 3 for extracting copper ions through a conveying pipeline by a first pressure pump 25, discharging the waste water containing the copper-cyanogen complex into a cyanogen breaking tank 4 after extraction, regulating the pH value in the cyanogen breaking tank to 7-9, then adding a cyanogen breaking agent into the cyanogen breaking tank 4 through a second chemical adding device 22, after cyanogen breaking is finished, conveying the waste water after cyanogen breaking to a second copper extraction separator 5 by a second pressure pump 26 to respectively obtain waste water and copper ion separation liquid, combining the copper ion separation liquid obtained by the first copper extraction separator 3 and the second copper extraction separator 5, then conveying the copper ion separation liquid to a back extraction separator 6 through a pipeline together, back extracting the copper ions in the back extraction separator 6, and introducing the copper ions obtained by back extraction into an electrolytic cell 7 through a pipeline, adjusting the pH value in the electrolytic cell 7 to 3-5, keeping constant temperature through a temperature sensor and an electric heating pipe 17, circulating the electrolyte through a circulating pump 18, electrolyzing copper ions, and improving the electrolysis efficiency to obtain a copper plate; discharging the obtained wastewater into the second regulating tank 8, adding a heavy metal capture agent, discharging the wastewater into the second filtering tank 24 through a lifting pump 27 after heavy metal capture is finished, filtering, discharging filtrate into the adsorption tank 9, adsorbing residual trace heavy metals through zeolite or medical stone in an adsorption pipeline 15, and finally introducing the treated water into the storage tank 10 for recycling.
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 (8)

1. The electroplating copper-containing sewage treatment system is characterized by comprising a first filter tank (1), a first regulating tank (2) and a first copper separation and extraction machine (3), wherein the first filter tank (1), the first regulating tank (2) and the first copper separation and extraction machine (3) are sequentially communicated through a pipeline, the first copper separation and extraction machine (3) is respectively communicated with a cyanogen breaking tank (4) and a back extraction separator (6), the cyanogen breaking tank (4) is connected with a second copper separation and extraction machine (5), the second copper separation and extraction machine (5) is also communicated with the back extraction separator (6), and the back extraction separator (6) is also connected with an electrolytic cell (7) through a pipeline;
and the second copper separation and extraction machine (5) is sequentially communicated with a second regulating tank (8), a second filtering tank (24), an adsorption tank (9) and a water storage tank (10) through pipelines.
2. The copper-containing electroplating sewage treatment system according to claim 1, wherein a coarse filter screen (11), a fine filter screen (12) and a tubular ultrafiltration membrane (13) are sequentially arranged in the filter tank (1) from top to bottom, the pore sizes of the coarse filter screen (11), the fine filter screen (12) and the tubular ultrafiltration membrane (13) are sequentially reduced, and a sewage inlet (14) is arranged on the filter tank (1) and above the coarse filter screen (11).
3. The copper-containing electroplating sewage treatment system according to claim 2, wherein the first regulating tank (2) is connected with a first doser (21) through a pipeline, the cyanogen breaking tank (4) is connected with a second doser (22) through a pipeline, and the second regulating tank (8) is connected with a third doser (23) through a pipeline.
4. The copper-containing electroplating sewage treatment system according to claim 3, wherein the electrolytic cell (7) is divided into an upper area and a lower area by a transverse plate (16), the lower area is provided with a plurality of electric heating pipes (17) side by side, and the upper area is provided with a circulating pump (18) and a temperature sensor.
5. The copper-containing electroplating sewage treatment system according to claim 4, wherein pH detectors are arranged in the second regulating tank (8), the cyanogen breaking tank (4), the first regulating tank (2) and the electrolytic tank (7), and oxidation-reduction regulators are arranged in the second regulating tank (8), the cyanogen breaking tank (4) and the regulating tank (2); an aeration pipeline (19) is arranged at the inner bottom of the cyanogen breaking pool (4), one end of the aeration pipeline (19) penetrates through the side wall of the cyanogen breaking pool (4) and extends outwards, an air inlet pump (20) is fixedly connected to the end part of the aeration pipeline, and an aeration hole is formed in the aeration pipeline (19) in the cyanogen breaking pool (4).
6. The copper-containing electroplating sewage treatment system according to claim 5, wherein a first pressure pump (25) is arranged between the first regulating tank (2) and the first copper extraction separator (3), a second pressure pump (26) is arranged between the cyanogen breaking tank (4) and the second copper extraction separator (5), a lifting pump (27) is arranged between the second regulating tank (8) and the second filtering tank (24), a controller (28) and a control panel (29) are arranged on the side wall of the adsorption tank (9), a display screen and a control switch are arranged on the control panel (29), and the controller (28) is respectively connected with the control panel (29), the air inlet pump (20), the oxidation-reduction regulator, the pH detector, the first pressure pump (25), the second pressure pump (26), The lifting pump (27), the electric heating pipe (23), the temperature sensor and the circulating pump (24) are electrically connected, and the controller (28) is electrically connected with a power supply.
7. The electroplating copper-containing sewage treatment system according to claim 6, wherein an adsorption pipeline (15) is arranged in the adsorption tank (9), the adsorption pipeline (15) is arranged in an arched manner in the adsorption tank, and zeolite or medical stone for adsorbing residual heavy metal ions is filled in the adsorption pipeline (15).
8. The process for treating sewage by using the electroplating copper-containing sewage treatment system according to claim 7, which is characterized by comprising the following steps of:
step 1, carrying out rough filtration, fine filtration and ultrafiltration on the electroplating copper-containing sewage in the filtration tank (1), collecting the obtained filtrate in the first regulating tank (2), and regulating the pH value of the electroplating copper-containing sewage to 6-7;
step 2, conveying the sewage in the regulating tank (2) into a first copper extraction separator (3) for extracting copper ions through a conveying pipeline by a first pressure pump (25), discharging the waste water containing the copper-cyanogen complex into a cyanogen breaking tank (4) after extraction, regulating the pH value in the cyanogen breaking tank to 7-9, then adding a cyanogen breaking agent into the cyanogen breaking tank (4), conveying the waste water after cyanogen breaking to a second copper extraction separator (5) by a second pressure pump (26) after cyanogen breaking is finished, respectively obtaining the waste water and a copper ion separation liquid, combining the copper ion separation liquids obtained by the first copper extraction separator (3) and the second copper extraction separator (5), then conveying the copper ion separation liquids to a back extraction separator (6) through a pipeline together, back extracting the copper ions in the back extraction separator (6), and introducing the copper ions obtained by back extraction into an electrolytic cell (7) through a pipeline, adjusting the pH value in the electrolytic cell (7) to 3-5, maintaining the constant temperature, circulating the electrolyte, and electrolyzing copper ions to obtain a copper plate;
and 3, discharging the wastewater obtained in the step 2 into the second regulating tank (8), adding a heavy metal capturing agent, discharging the wastewater into the second filtering tank (24) through a lifting pump (27) after heavy metal capturing is finished, filtering, discharging filtrate into the adsorption tank (9), adsorbing residual trace heavy metals, and finally introducing the treated water into the storage tank (10) for recycling.
CN201911095615.6A 2019-11-11 2019-11-11 Electroplating copper-containing sewage treatment system and treatment process Expired - Fee Related CN110683684B (en)

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