CN112624483A - Treatment system and treatment method for circuit board production spray tower wastewater - Google Patents
Treatment system and treatment method for circuit board production spray tower wastewater Download PDFInfo
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- CN112624483A CN112624483A CN202110134025.0A CN202110134025A CN112624483A CN 112624483 A CN112624483 A CN 112624483A CN 202110134025 A CN202110134025 A CN 202110134025A CN 112624483 A CN112624483 A CN 112624483A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- 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
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C02F2001/007—Processes including a sedimentation step
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- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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
Abstract
The invention discloses a treatment system and a treatment method for wastewater of a spray tower in circuit board production, wherein the system comprises an electrocatalytic oxidation unit, a resin adsorption unit and an evaporative crystallization unit; firstly, mixing and introducing acid waste gas spray tower waste water and alkaline waste gas spray tower waste water into an electrocatalytic oxidation unit, carrying out electrocatalytic oxidation to carry out catalytic oxidation on copper ions in the waste water to recover copper, and degrading ammonia nitrogen in the waste water; then, carrying out deep copper removal treatment on the wastewater subjected to electrocatalytic oxidation treatment by adopting a resin adsorption unit; and finally, evaporating and crystallizing the waste water adsorbed by the resin, crystallizing and separating out salt in the waste water, and adding acid into the condensate to be used as a regeneration liquid of the resin adsorption tank, and being used as backwash water of the sand filter tank and reused for a spray tower. By adopting the system and the method for treating the wastewater of the acid-base waste gas spray tower in the circuit board industry, not only can copper and industrial salt be recovered, but also zero discharge of the wastewater is realized.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment system and a treatment method for wastewater of a circuit board production spray tower.
Background
The horizontal copper deposition, electroplating, browning, acid washing and acid etching lines in the circuit board manufacturing process can generate acid mist, the processing is generally carried out by adopting an alkali-adding spraying mode, when the salt content of the spraying liquid rises to a certain degree, the spraying liquid needs to be replaced, and the waste water of the acid waste gas spraying tower can be generated, and the waste water has the characteristics of high copper content and high salt content. In addition, the alkaline ammonia nitrogen waste gas that alkaline etching line produced generally adopts the mode of adding acid and spraying to handle, and after ammonia nitrogen and copper ion rise in the spray solution, also need to change the processing, then there can be alkaline waste gas spray column waste water production, and the leading features in the waste water is salt content, copper and ammonia nitrogen content are high.
The direct electrolytic method adopted at present recovers copper; recovering copper by an extraction method; the common chemical precipitation method for preparing the copper sulfate consumes a large amount of acid and alkali, the quality of the prepared copper sulfate is poor, and the recovery value is not high. And the adopted process of neutralizing the acidic copper-containing etching waste liquid by using the alkaline copper-containing etching waste liquid and recovering copper by filter pressing and ion exchange can generate about 10 percent of ammonium chloride waste water containing heavy metal ions such as COD (chemical oxygen demand), Cu2+ and the like, and the treatment has high requirements on equipment materials and great difficulty.
The self-built sewage station of an enterprise can not effectively treat the waste water of the acid-base waste gas spray tower, the external treatment cost is high, the operation cost of the enterprise is increased, the replacement frequency of the spray waste water is reduced, and the waste gas treatment efficiency is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a treatment system and a treatment method for circuit board production spray tower wastewater.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment system for wastewater of a spray tower in circuit board production comprises an electrocatalytic oxidation unit, a resin adsorption unit and an evaporative crystallization unit, wherein the electrocatalytic oxidation unit is connected with the resin adsorption unit through a first outlet pipe, and the resin adsorption unit is connected with the evaporative crystallization unit through a second outlet pipe;
the electrocatalytic oxidation unit sequentially comprises a water quality adjusting tank, an electrocatalytic oxidation reaction tank, a sedimentation tank and a clean water tank; the upper ends of the water quality regulating tank, the electrocatalytic oxidation reaction tank, the sedimentation tank and the clean water tank are communicated through overflow holes;
the resin adsorption unit comprises a sand filter tank, a resin adsorption tank and a first pipeline, wherein one end of the first pipeline is connected with the lower end of the sand filter tank, the other end of the first pipeline is connected with the upper end of the resin adsorption tank, the upper end of the sand filter tank is provided with a sand filtration backwashing water outlet, the lower end of the sand filter tank is also provided with a sand filtration backwashing water inlet, the upper end of the resin adsorption tank is also provided with a resin regeneration liquid inlet, and the lower end of the resin adsorption tank is provided with a resin regeneration liquid outlet;
the evaporative crystallization unit comprises a preheater, a heater, a forced circulation pump, a gas-liquid separator, centrifugal separation equipment, a gas compressor, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a return pipe and a third outlet pipe, wherein the forced circulation pump is arranged on the return pipe, the return pipe is connected with the lower end of the heater, the gas compressor is arranged on the fourth pipeline, the preheater is connected with the lower end of the heater through the second pipeline, the upper end of the heater is connected with the gas-liquid separator through the third pipeline, the upper end of the gas-liquid separator is connected with the upper end of the heater through the fourth pipeline, the lower end of the gas-liquid separator is connected with the centrifugal separation equipment through the fifth pipeline, the centrifugal separation equipment is provided with an industrial salt outlet, and the lower end of the centrifugal separation equipment is also provided with the sixth pipeline, the lower end of the gas-liquid separator is also provided with a condensate outlet pipe,
the sixth pipeline and the condensate outlet pipe are communicated with the return pipe, the sixth pipeline and the condensate outlet pipe are communicated with the third outlet pipe,
the second conduit and the third outlet pipe extend through the preheater;
further, the water quality adjusting tank is provided with a first line pH meter, a first liquid level meter and a first online ammonia nitrogen sensor, the upper portion of the water quality adjusting tank is provided with a wastewater inlet, and the bottom of the water quality adjusting tank is provided with a first aeration pipe.
Further, the electrocatalytic oxidation reaction tank is provided with an electrode unit, a sieve plate is arranged below the electrode unit, and a second aeration pipe is arranged below the sieve plate.
Further, the electrode unit comprises a cathode plate, an anode plate and a power supply, wherein the power supply is arranged outside the electrocatalytic oxidation reaction tank, the anode plate and the cathode plate are respectively connected with the anode and the cathode of the power supply, the anode plate and the cathode plate are arranged in a parallel staggered mode, and the distance between every two adjacent electrode plates is 30-100 mm.
Furthermore, a mud bucket is arranged at the bottom of the sedimentation tank, an emptying pipe is arranged at the bottom of the mud bucket, and an inclined pipe is arranged in the middle of the sedimentation tank.
Further, the clean water tank is provided with a second on-line pH meter, a second liquid level meter and a second on-line ammonia nitrogen sensor.
Further, be equipped with first pipeline valve on the first pipeline, be equipped with backwash water outlet valve in the sand filtration backwash water export, be equipped with backwash water inlet valve in the sand filtration backwash water import, be equipped with regeneration liquid inlet valve in the resin regeneration liquid import, be equipped with regeneration liquid outlet valve in the resin regeneration liquid export, be equipped with third outlet pipe valve on the third outlet pipe.
Furthermore, one end of the first outlet pipe is connected with the clean water tank, and the other end of the first outlet pipe is connected with the upper end of the sand filtering tank; one end of the second outlet pipe is connected with the lower end of the resin adsorption tank, and the other end of the second outlet pipe is connected with the second pipeline; and a first circulating pump is arranged on the first outlet pipe, and a second circulating pump is arranged on the second outlet pipe.
The invention also provides a treatment method of the circuit board production wastewater, which comprises the following steps:
(1) introducing the wastewater of the spray tower in the production of the circuit board into the electrocatalytic oxidation unit through the wastewater inlet from the collecting tank, and adjusting the wastewaterpH value of 8.5-9.5 and current density of 10-30 mA/cm2Reacting until the ammonia nitrogen meets the water requirement of the spray tower, separating copper ions in the wastewater from the wastewater through electrolytic reduction and alkaline precipitation, and recovering through precipitation;
(2) introducing the wastewater treated in the step (1) into a resin adsorption unit through a first outlet pipe, removing fine suspended matters in the wastewater through a sand filter tank, and adsorbing copper ions in the wastewater through the resin adsorption tank;
(3) introducing the wastewater treated in the step (2) into an evaporative crystallization unit through a second outlet pipe, preheating the wastewater in a preheater, then heating and vaporizing the wastewater in a heater, introducing the wastewater into a gas-liquid separator for condensation and salt crystallization separation, introducing the separated crystal salt into centrifugal separation equipment for solid-liquid separation, recovering the crystal salt as industrial salt, and recovering a condensate;
(4) and (4) taking the condensate obtained in the step (3) as backwashing water of a sand filter tank, or adding acid to be used as resin regeneration liquid of a resin adsorption tank, or recycling the condensate for a spray tower to realize zero discharge of wastewater.
Further, the evaporation crystallization unit in the step (3) is provided with a centrifugal separation device, the crystallized salt is separated out in the gas-liquid separator and then enters the centrifugal separation device, after solid-liquid separation, the crystallized salt is recovered as industrial salt, and the condensate enters the evaporation unit for cyclic evaporation treatment.
The invention has the beneficial effects that:
1. the electro-catalytic oxidation unit can not only recover copper, but also degrade ammonia nitrogen in wastewater; 2. the resin adsorption is adopted to carry out advanced treatment on copper ions in the wastewater, so that the recovery efficiency of copper is improved, the content of copper in industrial salt generated by subsequent evaporative crystallization is reduced, and the resource utilization of the industrial salt is facilitated; 3. salt in the wastewater is separated out through evaporation crystallization, and industrial salt and condensate are recovered; 4. the invention recovers copper and industrial salt in the wastewater of the acid-base waste gas spray tower in the circuit board industry, and achieves zero discharge of the wastewater.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view of a circuit board production spray tower wastewater treatment system of the present invention;
the labels in the figure are: 1-a first outlet pipe, 2-a second outlet pipe, 3-a third outlet pipe, 11-a water quality adjusting tank, 111-a first on-line pH meter, 112-a first liquid level meter, 113-a first on-line ammonia nitrogen sensor, 114-a wastewater inlet, 115-a first aeration pipe, 12-an electrocatalytic oxidation reaction tank, 121-a sieve plate, 122-a second aeration pipe, 123-a cathode plate, 124-an anode plate, 125-a power supply, 13-a sedimentation tank, 131-a mud bucket, 132-a drain pipe, 133-an inclined pipe, 14-a clean water tank, 141-a second on-line pH meter, 142-a second liquid level meter, 143-a second on-line ammonia nitrogen sensor, 15-an overflow hole, 21-a sand filter tank, 22-a resin adsorption tank, 23-a first pipeline, 24-a sand filter backwash water outlet, 25-sand filtration backwashing water inlet, 26-resin regeneration liquid inlet, 27-resin regeneration liquid outlet, 31-preheater, 32-heater, 33-forced circulation pump, 34-gas-liquid separator, 35-centrifugal separation equipment, 36-gas compressor, 37-second pipeline, 38-third pipeline, 39-fourth pipeline and 310-fifth pipeline, 311-a return pipe, 312-an industrial salt outlet, 313-a sixth pipeline, 314-a condensate outlet pipe, 101-a first circulating pump, 201-a second circulating pump, 2301-a first pipeline valve, 2401-a backwash water outlet valve, 2501-a backwash water inlet valve, 2601-a regeneration liquid inlet valve, 2701-a regeneration liquid outlet valve and 301-a third outlet pipe valve.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The reagents or instruments used in the present invention are not indicated by manufacturers, and are all conventional products commercially available.
In this embodiment, a processing system of circuit board production spray column waste water, including electrocatalytic oxidation unit, resin adsorption unit and evaporation crystallization unit, electrocatalytic oxidation unit and resin adsorption unit are connected through first outlet pipe 1, and resin adsorption unit and evaporation crystallization unit are connected through second outlet pipe 2, are equipped with first circulating pump 101 on first outlet pipe 1, are equipped with second circulating pump 201 on second outlet pipe 2.
In this embodiment, the electrocatalytic oxidation unit sequentially comprises a water quality adjusting tank 11, an electrocatalytic oxidation reaction tank 12, a sedimentation tank 13 and a clean water tank 14; the upper ends of the water quality adjusting tank 11, the electrocatalytic oxidation reaction tank 12, the sedimentation tank 13 and the clean water tank 14 are communicated through overflow holes 15.
In this embodiment, the water quality adjusting tank 11 is provided with a first line pH meter 111, a first liquid level meter 112 and a first on-line ammonia nitrogen sensor 113, the upper portion of the water quality adjusting tank 11 is provided with a wastewater inlet 114, the bottom of the water quality adjusting tank 11 is provided with a first aeration pipe 115, and the first aeration pipe 115 is provided with a plurality of uniformly distributed air outlets for supplying oxygen to wastewater through aeration.
In this embodiment, the electrocatalytic oxidation reaction tank 12 is provided with an electrode unit, a sieve plate 121 is arranged below the electrode unit, the sieve plate 121 is used for supporting the electrode unit, a second aeration pipe 122 is arranged below the sieve plate 121, and a plurality of uniformly distributed air outlets are arranged on the second aeration pipe 122 and used for supplying oxygen to wastewater through aeration.
In this embodiment, the electrode unit is composed of a cathode plate 123, an anode plate 124 and a power supply 125, the power supply 125 is disposed outside the electrocatalytic oxidation reaction tank 12, the anode plate 124 and the cathode plate 123 are respectively connected with the anode and cathode of the power supply 125, the anode plate 124 and the cathode plate 123 are connected in parallel and staggered, the distance between adjacent electrode plates is 30-100 mm, and in this embodiment, the distance between adjacent electrode plates is 80 mm.
In this embodiment, the bottom of the sedimentation tank 13 is provided with a hopper 131, the bottom of the hopper 131 is provided with an emptying pipe 132, and the middle of the sedimentation tank 13 is provided with an inclined pipe 133.
In this embodiment, the clean water tank 14 is provided with a second online pH meter 141, a second level meter 142, and a second online ammonia nitrogen sensor 143.
In this embodiment, the method for treating wastewater of a spray tower in the production of a circuit board by using an electrocatalytic oxidation unit comprises the following steps: introducing the wastewater of the spray tower in the production of the circuit board to be treated into a water quality adjusting tank 11 from a collecting tank through a wastewater inlet 114 for water quality adjustment; the regulated wastewater enters an electrocatalytic oxidation reaction tank 12 through an overflow hole 15 at the upper end for electrocatalytic oxidation, ammonia nitrogen is oxidized and removed at the anode by adopting an electrocatalytic oxidation method in the oxidation process, and copper ions are reduced to copper simple substances at the cathode for recovery; waste water after electrocatalytic oxidation enters the sedimentation tank 13 through the overflow hole 15 at the upper end, suspended matters are further filtered by the inclined pipe 133, and a copper simple substance is precipitated in the mud bucket 131 at the bottom and can be discharged through the emptying pipe 132. The electrocatalytic oxidation unit degrades ammonia nitrogen in the wastewater, removes copper ions and partial suspended matters in the wastewater, and recovers copper.
In this embodiment, the resin adsorption unit includes sand filtration jar 21, resin adsorption jar 22 and first pipeline 23, the one end of first pipeline 23 is connected with sand filtration jar 21's lower extreme, the other end of first pipeline 23 is connected with resin adsorption jar 22's upper end, sand filtration jar 21's upper end is equipped with sand filtration backwash water export 24, sand filtration jar 21's lower extreme is equipped with sand filtration backwash water import 25, resin adsorption jar 22's upper end is equipped with resin regeneration liquid import 26, resin adsorption jar 22's lower extreme is equipped with resin regeneration liquid export 27.
In this embodiment, one end of the first outlet pipe 1 is connected to the clean water tank 14, and the other end of the first outlet pipe 1 is connected to the lower end of the sand filtration backwash water outlet 24.
In this embodiment, the first pipeline 23 is provided with a first pipeline valve 2301, the sand filtration backwash water outlet 24 is provided with a backwash water outlet valve 2401, the sand filtration backwash water inlet 25 is provided with a backwash water inlet valve 2501, the resin regeneration liquid inlet 26 is provided with a regeneration liquid inlet valve 2601, the resin regeneration liquid outlet 27 is provided with a regeneration liquid outlet valve 2701, and the third outlet pipe 3 is provided with a third outlet pipe valve 301.
In this embodiment, the method for treating wastewater of a spray tower in circuit board production by using a resin adsorption unit comprises the following steps: the waste water after the treatment of the electrocatalytic oxidation unit is introduced into the resin adsorption unit under the action of the first circulating pump 101, the waste water enters the sand filtration tank 21 through the first outlet pipe (1), the sand filtration tank 21 intercepts fine suspended matters which are not removed by the electrocatalytic oxidation unit, and the waste water enters the resin adsorption tank 22 through the first pipeline 23 and is adsorbed by ions to remove residual copper ions in the waste water. This resin adsorption unit adopts resin adsorption to carry out advanced treatment to the copper ion in the waste water, not only promotes the recovery efficiency of copper, has still reduced the content of copper in the industrial salt that follow-up evaporation crystallization produced, does benefit to the utilization of industrial salt resources.
In this embodiment, the evaporative crystallization unit includes a preheater 31, a heater 32, a forced circulation pump 33, a gas-liquid separator 34, a centrifugal separation device 35, a gas compressor 36, a second pipeline 37, a third pipeline 38, a fourth pipeline 39, a fifth pipeline 310, a return pipe 311, and a third outlet pipe 3, the forced circulation pump 33 is disposed on the return pipe 311, the return pipe 311 is connected to the lower end of the heater 32, the gas compressor 36 is disposed on the fourth pipeline 39, the preheater 31 is connected to the lower end of the heater 32 through the second pipeline 37, the upper end of the heater 32 is connected to the gas-liquid separator 34 through the third pipeline 38, the upper end of the gas-liquid separator 34 is connected to the upper end of the heater 32 through the fourth pipeline 39, the lower end of the gas-liquid separator 34 is connected to the centrifugal separation device 35 through the fifth pipeline 310, the centrifugal separation device 35 is provided with an industrial salt outlet 312, the lower end of the centrifugal separation, the lower end of the gas-liquid separator 34 is further provided with a condensate outlet pipe 314, a sixth pipe 313, the condensate outlet pipe 314 and the return pipe 311 are communicated, the sixth pipe 313, the condensate outlet pipe 314, the return pipe 311 and the third outlet pipe 3 are communicated, and the second pipe 37 and the third outlet pipe 3 penetrate through the preheater 31.
In this embodiment, one end of the second outlet pipe 2 is connected to the lower end of the resin canister 22, and the other end of the second outlet pipe 2 is connected to the second pipe 37.
In this embodiment, the method for treating wastewater of a spray tower in circuit board production by an evaporative crystallization unit comprises the following steps: the waste water treated by the resin adsorption unit is introduced into the evaporation crystallization unit under the action of the second circulating pump 201, the waste water enters the second pipeline 37 through the second outlet pipe 2, the second pipeline 37 penetrates through the preheater 31, the waste water enters the heater 32 after being preheated in the preheater 31 for heating and vaporization, the gas enters the gas-liquid separator 34 through the third pipeline 38 and is condensed in the gas-liquid separator 34, the uncondensed gas returns to the heater 32 through the fourth pipeline 39 under the action of the gas compressor 36, the condensed liquid flows out through the condensate outlet pipe 314, under the condition of temperature reduction, salt in the liquid is crystallized and separated out, and the crystallized salt carries a little condensate to enter the centrifugal separation device 35 through the fifth pipeline 310. The crystallized salt is subjected to solid-liquid separation under the action of the centrifugal separation equipment 35, the crystallized salt is discharged from the industrial salt outlet 312, and the condensate enters the sixth pipeline 313. Because the sixth pipeline 313, the condensate outlet pipe 314 and the return pipe 311 are communicated, the third outlet pipe valve 301 can be closed, the forced circulation pump 33 is started, and the condensate can return to the heater 32 through the return pipe 311; meanwhile, as the sixth pipeline 313, the condensate outlet pipe 314, the return pipe 311 and the third outlet pipe 3 are communicated, the third outlet pipe valve 301 can be opened, the forced circulation pump 33 is closed, the condensate enters the third outlet pipe 3, the second pipeline 37 and the third outlet pipe 3 penetrate through the preheater 31 because the condensate has heat, and the second pipeline 37 and the third outlet pipe 3 exchange heat in the preheater 31 to preheat the wastewater in the second pipeline 37. The condensate discharged from the third outlet pipe 3 can be used as backwashing water of the sand filtration tank 21, or can be used as resin regeneration liquid of the resin adsorption tank 22 after acid addition, or can be recycled for a spray tower, so that zero discharge of wastewater is realized. The evaporation crystallization unit crystallizes and separates out salt in the wastewater, and recovers industrial salt and condensate, thereby realizing zero discharge of the wastewater.
In this embodiment, the evaporation crystallization unit is provided with a centrifugal separation device 35, the crystallized salt is precipitated in the gas-liquid separator 34 and then enters the centrifugal separation device 35, after solid-liquid separation, the crystallized salt is recovered as industrial salt, and the separated liquid (i.e., the condensate) enters the evaporation crystallization unit to continue the circulation evaporation treatment.
Those skilled in the art to which the present invention pertains can also make appropriate alterations and modifications to the above-described embodiments, in light of the above disclosure. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a processing system of circuit board production spray column waste water which characterized in that: the device comprises an electrocatalytic oxidation unit, a resin adsorption unit and an evaporative crystallization unit, wherein the electrocatalytic oxidation unit is connected with the resin adsorption unit through a first outlet pipe (1), and the resin adsorption unit is connected with the evaporative crystallization unit through a second outlet pipe (2);
the electrocatalytic oxidation unit sequentially comprises a water quality adjusting tank (11), an electrocatalytic oxidation reaction tank (12), a sedimentation tank (13) and a clean water tank (14); the upper ends of the water quality adjusting tank (11), the electrocatalytic oxidation reaction tank (12), the sedimentation tank (13) and the clean water tank (14) are communicated through overflow holes (15);
the resin adsorption unit comprises a sand filter tank (21), a resin adsorption tank (22) and a first pipeline (23), one end of the first pipeline (23) is connected with the lower end of the sand filter tank (21), the other end of the first pipeline (23) is connected with the upper end of the resin adsorption tank (22), a sand filter backwashing water outlet (24) is formed in the upper end of the sand filter tank (21), a sand filter backwashing water inlet (25) is formed in the lower end of the sand filter tank (24), a resin regeneration liquid inlet (26) is formed in the upper end of the resin adsorption tank (22), and a resin regeneration liquid outlet (27) is formed in the lower end of the resin adsorption tank (22);
the evaporative crystallization unit comprises a preheater (31), a heater (32), a forced circulation pump (33), a gas-liquid separator (34), a centrifugal separation device (35), a gas compressor (36), a second pipeline (37), a third pipeline (38), a fourth pipeline (39), a fifth pipeline (310), a return pipe (311) and a third outlet pipe (3), wherein the return pipe (311) is connected with the lower end of the heater (32), the forced circulation pump (33) is arranged on the return pipe (311), the gas compressor (36) is arranged on the fourth pipeline (39), the preheater (31) is connected with the lower end of the heater (32) through the second pipeline (37), the upper end of the heater (32) is connected with the gas-liquid separator (34) through the third pipeline (38), and the upper end of the gas-liquid separator (34) is connected with the upper end of the heater (32) through the fourth pipeline (39), the lower end of the gas-liquid separator (34) is connected with the centrifugal separation equipment (35) through the fifth pipeline (310), the centrifugal separation equipment (38) is provided with an industrial salt outlet (312), the lower end of the centrifugal separation equipment (35) is also provided with a sixth pipeline (313), the lower end of the gas-liquid separator (34) is also provided with a condensate outlet pipe (314),
the sixth pipeline (313) and the condensate outlet pipe (314) are communicated with the return pipe (311), the sixth pipeline (313), the condensate outlet pipe (314) and the return pipe (311) are communicated with the third outlet pipe (3), and the second pipeline (37) and the third outlet pipe (3) penetrate through the preheater (31).
2. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: the water quality adjusting tank (11) is provided with a first line pH meter (111), a first liquid level meter (112) and a first online ammonia nitrogen sensor (113), the water quality adjusting tank (11) is provided with a wastewater inlet (114), and the bottom of the water quality adjusting tank (11) is provided with a first aeration pipe (115).
3. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: the electrocatalytic oxidation reaction tank (12) is provided with an electrode unit, a sieve plate (121) is arranged below the electrode unit, and a second aeration pipe (122) is arranged below the sieve plate (121).
4. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 3, wherein: the electrode unit comprises a cathode plate (123), an anode plate (124) and a power supply (125), wherein the power supply (125) is arranged outside the electrocatalytic oxidation reaction tank (12), the anode plate (124) and the cathode plate (123) are respectively connected with the anode and the cathode of the power supply (125), the anode plate (124) and the cathode plate (123) are arranged in a parallel and staggered mode, and the distance between every two adjacent electrode plates is 30-100 mm.
5. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: the bottom of sedimentation tank (13) is equipped with bagger (131), the bottom of bagger (131) is equipped with evacuation pipe (132), the middle part of sedimentation tank (13) is equipped with pipe chute (133).
6. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: the clean water tank (14) is provided with a second on-line pH meter (141), a second liquid level meter (142) and a second on-line ammonia nitrogen sensor (143).
7. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: be equipped with first pipeline valve (2301) on first pipeline (23), be equipped with backwash water outlet valve (2401) on sand filtration backwash water export (24), be equipped with backwash water inlet valve (2501) on sand filtration backwash water import (25), be equipped with regeneration liquid inlet valve (2601) on resin regeneration liquid import (26), be equipped with regeneration liquid outlet valve (2701) on resin regeneration liquid export (27), be equipped with third outlet pipe valve (301) on third outlet pipe (3).
8. The system for treating wastewater of a spray tower for producing circuit boards as claimed in claim 1, wherein: one end of the first outlet pipe (1) is connected with the clean water tank (14), and the other end of the first outlet pipe (1) is connected with the upper end of the sand filtering tank (21);
one end of the second outlet pipe (2) is connected with the lower end of the resin adsorption tank (22), and the other end of the second outlet pipe (2) is connected with the second pipeline (37);
and a first circulating pump (101) is arranged on the first outlet pipe (1), and a second circulating pump (201) is arranged on the second outlet pipe (2).
9. A treatment method of circuit board production spray tower wastewater is characterized in that: the method comprises the following steps:
(1) wastewater of a spray tower in the production of the circuit board is introduced into an electrocatalytic oxidation unit from a collecting tank through a wastewater inlet (114), the pH value of the wastewater is adjusted to be 8.5-9.5, and the current density is 10-30 mA/cm2Reacting until the ammonia nitrogen meets the water requirement of the spray tower, separating copper ions in the wastewater from the wastewater through electrolytic reduction and alkaline precipitation, and recovering through precipitation;
(2) introducing the wastewater treated in the step (1) into a resin adsorption unit through a first outlet pipe (1), removing fine suspended matters in the wastewater through a sand filter tank (21), and adsorbing copper ions in the wastewater through a resin adsorption tank (22);
(3) introducing the wastewater treated in the step (2) into an evaporative crystallization unit through a second outlet pipe (2), preheating the wastewater in a preheater (31), then heating and vaporizing the wastewater in a heater (32), entering a gas-liquid separator (34) for condensation and salt crystallization separation, after the crystal salt is separated out, entering centrifugal separation equipment (35) for solid-liquid separation, recovering the crystal salt as industrial salt, and recovering a condensate;
(4) and (4) taking the condensate obtained in the step (3) as backwashing water of the sand filter tank (21), or adding acid to be used as resin regeneration liquid of the resin adsorption tank (22), or recycling the condensate for a spray tower to achieve zero discharge of wastewater.
10. The method for treating wastewater of a spray tower in circuit board production according to claim 9, wherein the method comprises the following steps: and (3) the evaporation and crystallization unit is provided with a centrifugal separation device (35), the crystallized salt is separated out in the gas-liquid separator (34) and then enters the centrifugal separation device (35), the crystallized salt is recovered as industrial salt after solid-liquid separation, and the condensate enters the evaporation unit for cyclic evaporation treatment.
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