CN102765832B - System for recycling nickel from electroplating wastewater - Google Patents

Abstract

A nickel recovery and treatment system in electroplating wastewater, including a wastewater pretreatment system, a reverse osmosis system, and a modified polymer material adsorption system. Water bucket, the concentrated liquid in the concentrated bucket is sent into the NF membrane through the pipeline and the booster pump. The NF membrane has two outlets, which are respectively connected with the sodium-containing bucket and the modified polymer material adsorption system. The solution in the sodium-containing bucket is passed through the tube. Road and booster pump into the RO membrane, RO membrane has two outlets, which are respectively connected to the pure water barrel and the sodium-containing barrel; the modified polymer material adsorption system includes multi-stage resin adsorption tanks, dispensing boxes, regeneration pumps and concentration barrels , the water outlet of the multi-stage resin adsorption tank is connected with the water inlet of the concentration barrel, and the dispensing box is connected to the resin adsorption tank through the regeneration pump, the pipeline and each branch valve. The system can realize the recycling of nickel in electroplating wastewater and reuse of wastewater, and has good economic and environmental benefits.

Description

A nickel recovery and treatment system in electroplating wastewater

technical field

The invention belongs to wastewater treatment equipment in the electroplating industry, and in particular relates to equipment for treating nickel metal ions in electroplating wastewater.

Background technique

With the implementation of the sustainable development strategy, people pay more and more attention to circular economy and clean production technology. Since the reform and opening up, my country's economy has developed rapidly, but environmental protection work has not been able to keep up with the pace of urgent development, especially in the prevention and control of heavy metal pollution. aspect.

The existing methods of treating nickel ions in electroplating wastewater are mainly through chemical precipitation, reverse osmosis membrane treatment, ion exchange and other methods. Chemical precipitation is to add a precipitant such as hydroxide to nickel-containing wastewater to precipitate nickel metal ions and cannot be recycled. The utilization does not meet the national environmental protection standards; the reverse osmosis membrane treatment method has the characteristics of high efficiency, short process flow, and easy control, but the composition of electroplating wastewater is relatively complex, which requires high quality of the membrane and strict pretreatment; ion exchange method It can better realize the recycling of nickel ions and water resources, but in the ion exchange process, the impurities in the wastewater will affect the ion exchange efficiency and the purity of the recovered nickel ions.

Contents of the invention

In order to solve the above problems, the present invention provides an electroplating wastewater recovery and treatment system, including a wastewater pretreatment system, a reverse osmosis system, and a modified polymer material adsorption system, and the water inlet of the wastewater pretreatment system is communicated with the electroplating wastewater collection pool , characterized in that: the reverse osmosis system includes a concentration barrel, booster pump, NF membrane, sodium-containing barrel, RO membrane and pure water barrel, the outlet of the wastewater pretreatment system is connected to the concentration barrel, and the concentrated liquid in the concentration barrel passes through the pipeline and the booster pump into the NF membrane, the NF membrane is provided with two outlets, the first outlet is connected with the sodium-containing barrel for sending the permeate into the sodium-containing barrel, and the second outlet is adsorbed with the modified polymer material The system is connected to send the concentrated solution to the modified polymer material adsorption system. The solution in the sodium-containing barrel is sent to the RO membrane through the pipeline and the booster pump. The RO membrane is provided with two outlets, the first outlet and the pure The water barrel is connected to send the permeated pure water into the pure water barrel, and the second outlet is connected to the sodium-containing barrel to form a circulation loop for returning the solution to the sodium-containing barrel; the modified polymer material adsorption system includes multi-stage resin Adsorption tank, dispensing box, regeneration pump and concentration barrel, the concentrated liquid sent by the second outlet of NF membrane is passed into the multi-stage resin adsorption tank, the water outlet of the multi-stage resin adsorption tank is connected with the water inlet of the concentration barrel, and the dispensing box passes through The regeneration pump, the pipeline and each branch valve are connected to the resin adsorption tank.

Further, the wastewater pretreatment system includes a sand carbon tank, a security filter, and a UF membrane connected in sequence. The UF membrane has two outlets. The first outlet is connected to the concentration barrel for sending the concentrate into the concentration barrel. The second outlet is connected to the concentration barrel. The second outlet communicates with the electroplating waste water collection pool to form a circulation loop for returning the permeate to the electroplating waste water collection pool.

Further, the water inlet of the sand carbon tank communicates with the electroplating wastewater collection pool through the raw water pump.

Further, an outflow pipeline is connected to the second outlet of the RO membrane.

Further, the modified polymer material adsorption system also includes a second concentration barrel, the water inlet of which is connected to the second outlet of the NF membrane, and the water outlet is connected to the water inlet of the multi-stage resin adsorption tank.

Further, the second outlet of the NF membrane is communicated with the concentration barrel through a pipeline to form a circulating loop. There are two outlets on the pipeline, and one outlet sends the concentrated solution into the multi-stage resin adsorption tank. , The other outer discharge port communicates with the water inlet of the second concentration barrel.

Further, the dispensing box includes a lye bucket, a pure water bucket and an acid bucket, the lye bucket, the pure water bucket and the acid bucket are respectively connected to the regeneration pump, and communicated with the resin adsorption tank through pipelines and branch valves .

The present invention has following beneficial effect:

According to the electroplating wastewater nickel recovery and treatment system provided by the present invention, the reverse osmosis membrane method and the ion exchange method are organically combined to treat the electroplating wastewater, which can realize the recycling of nickel in the electroplating wastewater and the reuse of wastewater, and has good economic benefits and Environmental benefits; before the ion exchange, the wastewater passes through the wastewater pretreatment system and the reverse osmosis membrane, which can effectively remove impurities and sodium ions in the wastewater, improve the ion exchange efficiency and the purity of the recovered nickel ions.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

With reference to a kind of electroplating wastewater nickel recovery treatment system shown in Fig. 1, a kind of nickel recovery treatment system in electroplating wastewater, comprises the water pretreatment system 2 that is connected with electroplating wastewater collection pool 1 successively, reverse osmosis system 3, modified macromolecule material Adsorption system 4;

The wastewater pretreatment system 2 includes a sand carbon tank 21, a security filter 22, and a UF membrane 23 connected in sequence. The wastewater in the electroplating wastewater collection tank 1 is passed into the sand carbon tank 21 through the raw water pump 11, and the UF membrane 23 has two outlets. , the first outlet 231 communicates with the reverse osmosis system 3 for sending the concentrated solution into the reverse osmosis system 3, and the second outlet 232 communicates with the electroplating wastewater collection pool 1 for sending the permeate back to the electroplating wastewater collection pool 1 for circulation treatment; the wastewater pretreatment system 2 can effectively remove the organic matter in the electroplating wastewater, improve the water quality of the electroplating wastewater after treatment, and make the electroplating wastewater meet the best requirements before entering the reverse osmosis system 3;

Reverse osmosis system 3 comprises concentrating tank 31, NF membrane 32, sodium-containing tank 33, RO membrane 34 and pure water tank 35, booster pump 36, the first outlet 231 of UF membrane 23 leads in concentrating tank 31, in concentrating tank 31 Concentrated liquid is sent into NF membrane 32 through pipeline and booster pump 36, and NF membrane 32 is provided with two outlets, and the first outlet 321 is communicated with the sodium-containing bucket and is used for sending permeate into the sodium-containing bucket, and the second outlet 322 communicates with the concentration barrel 31 and is used to send the concentrated solution back to the concentration barrel 31 for recycling treatment. The second outlet 322 is provided with an outlet for sending the concentrated solution into the modified polymer material adsorption system 4; the sodium-containing barrel The solution in 33 is sent into the RO membrane 34 through the pipeline and the booster pump 36. The RO membrane 34 is provided with two outlets. The first outlet 341 is connected to the pure water bucket for sending the permeated pure water into the pure water bucket. Among them, the second outlet 342 is in communication with the sodium-containing barrel 33 for sending the solution back to the sodium-containing barrel 33 for circulation treatment, and the second outlet is also provided with an evacuation pipeline 343 to directly discharge the solution for use;

The modified polymer material adsorption system 4 includes a multi-stage resin adsorption tank 41, a second concentration barrel 42, a dispensing box 43, a regeneration pump 44, and a concentration barrel 45. The second outlet 322 of the NF membrane 32 is provided with two outlets , one outer outlet sends the concentrate into the multi-stage resin adsorption tank 41, the other outer outlet communicates with the water inlet of the second concentration bucket 42, and the water outlet of the multi-stage resin adsorption tank 41 is connected with the water inlet of the concentration bucket 45 Connected, the dispensing box 43 includes a lye bucket 431, a pure water bucket 432 and an acid bucket 433, and the lye bucket 431, the pure water bucket 432 and the acid bucket 433 are connected to the resin adsorption via the regeneration pump 44, the pipeline and each branch valve respectively. 41 on the tank.

The above is only a preferred embodiment of the present invention, so it cannot limit the scope of the present invention, that is, the equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still belong to the patent of the present invention within the scope covered.

Claims (7)

1. nickel recovery treatment system in a kind of electroplating waste water, comprise waste water pretreatment system, reverse osmosis system, modified macromolecular material adsorption system, the water inlet of described waste water pretreatment system is communicated with electroplating waste water collecting pool, it is characterized in that: The reverse osmosis system includes a concentration tank, booster pump, NF membrane, sodium tank, RO membrane and pure water tank. The outlet of the wastewater pretreatment system is connected to the concentration tank, and the concentrated liquid in the concentration tank is sent in through the pipeline and the booster pump. NF membrane, the NF membrane is provided with two outlets, the first outlet is connected with the sodium-containing barrel for sending the permeate into the sodium-containing barrel, and the second outlet is connected with the modified polymer material adsorption system for concentrating The solution is sent to the modified polymer material adsorption system, and the solution in the sodium-containing bucket is sent to the RO membrane through the pipeline and the booster pump. The RO membrane is provided with two outlets, the first outlet is connected to the pure water bucket for Send the permeated pure water into the pure water bucket, and the second outlet is connected with the sodium-containing bucket to form a circulation loop for returning the solution to the sodium-containing bucket; The modified polymer material adsorption system includes a multi-stage resin adsorption tank, a dispensing box, a regeneration pump and a concentration barrel. It is connected with the water inlet of the concentration tank, and the dispensing box is connected to the resin adsorption tank through the regeneration pump, the pipeline and each branch valve. the 2. The nickel recovery and treatment system in electroplating wastewater according to claim 1 is characterized in that: the wastewater pretreatment system includes sand carbon tanks, security filters, and UF membranes connected in sequence, and the UF membrane has two outlets. One outlet communicates with the concentration tank for sending the concentrate into the concentration tank, and the second outlet communicates with the electroplating waste water collection tank to form a circulation loop for sending the permeate back to the electroplating waste water collection tank. the 3. The nickel recovery and treatment system in electroplating wastewater according to claim 2, characterized in that: the water inlet of the sand carbon tank communicates with the electroplating wastewater collection pool through a raw water pump. the 4. The nickel recovery and treatment system in electroplating wastewater according to claim 1, characterized in that: the second outlet of the RO membrane is connected with an outflow pipeline. the 5. nickel recovery treatment system in the electroplating waste water according to claim 1, is characterized in that: described modified macromolecular material adsorption system also comprises the second concentrating barrel, and its water inlet is communicated with the second outlet of NF membrane, and outlet The water port communicates with the water inlet of the multi-stage resin adsorption tank. the 6. The nickel recovery and treatment system in electroplating wastewater according to claim 5, characterized in that: the second outlet of the NF membrane is communicated with the concentration barrel through a pipeline to form a circulating loop, and there are two outer outlets on the pipeline. Outlet, one outer outlet sends the concentrated liquid into the multi-stage resin adsorption tank, and the other outer outlet communicates with the water inlet of the second concentration barrel. the 7. nickel recovery and treatment system in electroplating waste water according to claim 1 is characterized in that: described dispensing box comprises lye bucket, pure water bucket and acid bucket, and described lye bucket, pure water bucket and acid bucket are respectively It is connected with the regeneration pump and communicated with the resin adsorption tank through the pipeline and branch valve. the

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