Wastewater recovery equipment and recovery process

Abstract

The invention provides wastewater recovery equipment and a recovery process, and relates to the technical field of wastewater recovery, the wastewater recovery equipment comprises a resin tank, an outlet pipeline and an inlet pipeline which can be alternatively communicated with an adjusting barrel, a pure water barrel and a regeneration barrel; the outlet pipeline and the inlet pipeline are both communicated with the resin tank; a first branch pipe communicated with the waste water barrel, a second branch pipe communicated with the collecting tank, a third branch pipe communicated with the product barrel and a fourth branch pipe communicated with the regeneration barrel are arranged on the outlet pipeline in a communicating manner; valves are arranged on the outlet pipeline, the inlet pipeline, the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe. The problem of resource waste caused by unrecoverable nickel ions is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater recovery, in particular to a wastewater recovery equipment and recovery process. BACKGROUND

[0002] In the process of industrial production, industrial wastewater containing heavy metals will be produced, for example, a certain amount of nickel-containing wastewater will be produced in the electroplating process, which will cause serious pollution to the environment if discharged without treatment. When discharging, the nickel-containing wastewater is generally mixed with wastewater containing metal elements such as gold and tin, and then discharged into a sewage treatment tank.

[0003] The traditional nickel-containing wastewater usually adopts chemical sedimentation method. The workshop wastewater flows into the adjusting tank by itself, and the water quality and quantity are uniform. The corrosion-resistant lifting pump is used to lift to the PH adjusting tank, and under the alkaline adjustment, the heavy metal nickel ion forms the precipitate of nickel hydroxide to be removed. Although this method can remove the nickel ions in the wastewater, the amount of sludge (mainly precipitate) is large, and it will cause the nickel ions to be unrecoverable, causing resource waste. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a wastewater recovery equipment and recovery process, which solves the problem of nickel ion unrecoverability and resource waste.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A wastewater recovery equipment, comprising: a resin tank, an outlet pipeline and an inlet pipeline selectively communicating with an adjusting barrel, a pure water barrel and a regeneration barrel;

[0007] The outlet pipeline and the inlet pipeline are in communication with the resin tank;

[0008] The outlet pipeline is provided with a first branch pipe communicating with the wastewater barrel, a second branch pipe communicating with the collection tank, a third branch pipe communicating with the product barrel and a fourth branch pipe communicating with the regeneration barrel;

[0009] Valves are arranged on the outlet pipeline, the inlet pipeline, the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe.

[0010] Preferably, a magnetic pump is arranged on the inlet pipeline, and a filter is arranged between the magnetic pump and the resin tank.

[0011] Preferably, a pipeline for blowing compressed air is connected to the top of the resin tank, and an acid inlet and an alkali inlet are arranged on the pipeline between the magnetic pump and the resin tank.

[0012] A recovery process comprising the wastewater recovery equipment of any one of the above, comprising the following steps:

[0013] S1: the inlet pipeline is communicated with the adjusting barrel, the waste water enters the resin tank after passing through the filter, the nickel ion concentration at the outlet of the resin tank is detected, when the concentration is lower than the set value, the adjusting barrel is washed to the waste water tank, when the concentration is higher than the set value, the adjusting barrel is washed back to the collecting tank;

[0014] S2: the inlet pipeline is communicated with the pure water barrel, the pure water washes the resin tank body, when the collecting tank is lower than the running liquid level, the pure water barrel is washed back to the collecting tank;

[0015] S3: compressed air is used to purge the resin tank body, and residual moisture is discharged to the waste water tank;

[0016] S4: acid adding cycle, when the top conductivity is lower than the set value, sulfuric acid is supplemented to the resin tank body;

[0017] S5: compressed air is used to purge the resin tank body, and the nickel sulfate solution is blown out to the product tank;

[0018] S6: the inlet pipeline is communicated with the regeneration barrel, the residual nickel sulfate solution is washed with the regeneration barrel, and is added to the product tank;

[0019] S7: liquid alkali adding stage, the inlet pipeline is communicated with the pure water barrel, liquid alkali is mixed with pure water, and is continuously added to the resin tank from the bottom and is discharged to the waste water tank.

[0020] Preferably, after the compressed air purging in the S3 step, the inlet pipeline is communicated with the regeneration barrel, the sulfuric acid is mixed with the solution in the regeneration barrel, and is added to the resin tank from the top and is washed to the waste water tank.

[0021] Preferably, after the compressed air purging in the S3 step, the inlet pipeline is communicated with the regeneration barrel, the sulfuric acid is mixed with the solution in the regeneration barrel, and is added to the resin tank from the bottom and is washed to the waste water tank.

[0022] Preferably, after the top conductivity reaches the standard in the S4 step, an additional cycle of twenty minutes is performed.

[0023] Preferably, before the liquid alkali adding in the S7 step, the inlet pipeline is communicated with the pure water barrel, the residual solution is washed with pure water and is supplemented to the regeneration barrel until the regeneration barrel reaches the running liquid level, and then the system is continuously washed with pure water until the conductivity is lower than the set value.

[0024] Preferably, after the S7 step, an internal cycle of six minutes is performed, which is used to absorb the liquid alkali in the pipeline.

[0025] Preferably, after the internal cycle of six minutes, the system is continuously washed with pure water to waste water treatment until the bottom conductivity is lower than the set value.

[0026] The present application has the following beneficial effects:

[0027] The nickel ions in the nickel waste water can be recovered, and resource waste is avoided.

[0028] Other advantages, objects, and features of the application will be apparent from the following specification and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Part structure S1 step flush to waste tank path schematic diagram of the application;

[0030] Figure 2 Part structure S1 step flush to waste tank path schematic diagram of the application;

[0031] Figure 3 Part structure S3 step path schematic diagram of the application;

[0032] Figure 4 Part structure S4 step path schematic diagram of the application;

[0033] Figure 5 Part structure S5 step path schematic diagram of the application;

[0034] Figure 6 Part structure S6 step path schematic diagram of the application;

[0035] Figure 7 Part structure S7 step path schematic diagram of the application;

[0036] Figure 8 Part structure S3 step from the top flush to waste path schematic diagram of the application;

[0037] Figure 9 Part structure S3 step from the bottom flush to waste path schematic diagram of the application;

[0038] Figure 10 Part structure S7 step in the regeneration tank liquid level path schematic diagram of the application;

[0039] Figure 11 Part structure S7 step in the cleaning system path schematic diagram of the application.

[0040] In the above drawings: 1, resin tank; 2, outlet pipe; 21, first branch pipe; 22, second branch pipe; 23, third branch pipe; 24, fourth branch pipe; 3, inlet pipe; 4, magnetic pump; 5, filter; 61, acid inlet; 62, base inlet. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, purposes and effects of the application more clear and easy to understand, the technical solutions in the application will be further described below in combination with the drawings and examples.

[0042] Referring to Figures 1 to 11 As shown in the figure, a wastewater recovery device comprises a resin tank 1, an outlet pipeline 2 and an inlet pipeline 3 which can be selectively communicated with a regulating tank, a pure water tank and a regeneration tank; the outlet pipeline 2 and the inlet pipeline 3 are communicated with the resin tank 1; the outlet pipeline 2 is provided with a first branch pipe 21 communicated with a wastewater tank, a second branch pipe 22 communicated with a collection tank, a third branch pipe 23 communicated with a product tank and a fourth branch pipe 24 communicated with the regeneration tank; the outlet pipeline 2, the inlet pipeline 3, the first branch pipe 21, the second branch pipe 22, the third branch pipe 23 and the fourth branch pipe 24 are all provided with valves.

[0043] The inlet pipeline 3 is provided with a magnetic pump 4, and a filter 5 is arranged between the magnetic pump 4 and the resin tank 1. A pipeline for blowing compressed air is arranged on the top of the resin tank 1, and an acid adding inlet 61 and an alkali adding inlet 62 are arranged on the pipeline between the magnetic pump 4 and the resin tank 1.

[0044] The wastewater after ionization is filtered by the filter 5 under the action of the magnetic pump 4 and then enters the resin tank 1, the filter 5 is used for filtering suspended solids and colloids to prevent the resin tank 1 from being blocked, and the resin tank 1 is used for replacing nickel ions in the wastewater; wherein the regulating tank, the pure water tank, the regeneration tank, the wastewater tank, the collection tank and the product tank are not shown in the figure; the pure water tank is used for containing pure water; the regeneration tank contains a regenerant; the wastewater tank is used for collecting wastewater; the collection tank is used for collecting nickel-containing wastewater; the product tank is used for collecting nickel sulfate products; the regulating tank is used for controlling the PH value of the nickel wastewater to create the best chemical environment for efficient recovery of nickel; the regeneration tank is used for flushing the remaining nickel sulfate solution, and the solution in the pipeline is added to the product tank.

[0045] In operation, the magnetic pump 4 is used to extract nickel wastewater, which is filtered by the filter 5 and then delivered to the resin tank 1, and then ion exchange is performed with the resin, the resin adsorbs ions from various metal ions, and after saturation, acid washing is performed to fully recover the nickel adsorbed on the resin to obtain a high-concentration nickel sulfate solution which is blown by compressed air into the product tank for collection, so that the nickel ions in the nickel wastewater can be recovered to avoid resource waste. Then, a liquid alkali solution is introduced into the resin tank 1 for cleaning, so that the resin tank 1 restores the ability to adsorb nickel.

[0046] A recovery process comprising any of the wastewater recovery devices described above, comprising the following steps:

[0047] S1: the inlet pipeline 3 is communicated with the regulating tank, and the wastewater enters the resin tank 1 after being filtered by the filter 5 to react, the nickel ion concentration at the outlet of the resin tank 1 is detected, and when the concentration is lower than a set value, such as 0.1 mg / L, the magnetic pump 4 is started to pump the wastewater into the resin tank 1. Figure 1As shown, from the adjustment barrel to the waste water barrel, when the concentration is higher than the set value, it indicates that the content of nickel in the waste water is higher at this time, and the waste water needs to be reacted again, such as Figure 2 As shown, from the adjustment barrel to the recovery collection tank for collection; the concentration set value of nickel ions here can be set according to requirements, for example, the nickel concentration is set to 0.1 mg / L;

[0048] S2: The inlet pipeline 3 is in communication with the pure water barrel, and the pure water washes the tank body of the resin tank 1; when the collection tank is lower than the running liquid level, the pure water barrel is used to flush the recovery collection tank; the use of pure water flushing can play the role of supplementing the liquid level and flushing the pipeline, and will not interfere with the subsequent recovery process;

[0049] S3: As shown, Figure 3 In order to completely empty the water in the vertical tank 1, compressed air is used to purge the tank body of the resin tank 1, and the residual water is discharged to the waste water barrel;

[0050] S4: As shown, Figure 6 Add acid circulation to generate a nickel sulfate solution; when the top conductivity is lower than the set value, supplement sulfuric acid to the tank body of the resin tank 1; the conductivity setting here needs to be set according to the actual resin type, etc., for example, the conductivity of the weak acid cation resin is set to 800-1200 μS / cm;

[0051] S5: As shown, Figure 7 Compressed air is used to purge the tank body of the resin tank 1, and the nickel sulfate solution is blown out to the product barrel for collection of the nickel sulfate solution;

[0052] S6: As shown, Figure 8 The inlet pipeline 3 is in communication with the regeneration barrel, and the remaining nickel sulfate solution is flushed with the regeneration barrel and added to the product barrel to completely collect the nickel sulfate solution;

[0053] S7: As shown, Figure 11 The liquid alkali stage, the inlet pipeline 3 is in communication with the pure water barrel, and the pure water mixed liquid alkali is continuously added from the bottom of the resin tank 1 to the waste water barrel to restore the adsorption capacity of the resin for nickel.

[0054] Further, in the S3 step, after the compressed air purge, as shown, Figure 4 The inlet pipeline 3 is in communication with the regeneration barrel, and the remaining nickel sulfate solution is flushed with the regeneration barrel and added to the product barrel to completely collect the nickel sulfate solution;

[0055] Further, as shown, Figure 5To ensure the solution after flushing contains nickel ions concentration, the whole pipeline is flushed again, compressed air purging, the inlet pipeline 3 is connected with the regeneration barrel, the solution in the regeneration barrel is mixed with sulfuric acid, the resin tank 1 is added from the bottom, and the flushing is performed to the waste water tank.

[0056] Further, the nickel ion desorption inside the resin particles is a gradual process, to overcome the ion exchange hysteresis effect, in the S4 step, after the top conductivity reaches the standard, an additional twenty minutes of circulation is performed.

[0057] Further, in the S7 step, before adding liquid alkali, as shown in Figure 9 The inlet pipeline 3 is connected with the pure water tank, the remaining solution is flushed with pure water to the regeneration barrel until the regeneration barrel reaches the operating liquid level, the liquid level in the regeneration barrel is supplemented, then as shown in Figure 10 The system is continuously cleaned with pure water until the conductivity is lower than the set value.

[0058] Further, after the S7 step, six minutes of internal circulation is performed to absorb the liquid alkali in the pipeline and perform sufficient reaction.

[0059] Further, after the six minutes of internal circulation, the system is continuously flushed with pure water to waste water treatment until the bottom conductivity is lower than the set value, the bottom conductivity here is set to 2.5 μS / cm.

[0060] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A wastewater recovery apparatus, characterized by, The utility model relates to a kind of resin tank, outlet pipeline (2) and the import pipeline (3) that can alternatively communicate with adjusting barrel, pure water barrel and regeneration barrel; The outlet pipeline (2), import pipeline (3) are communicated with resin tank (1); The first branch pipe (21) for communicating with waste water tank, the second branch pipe (22) for communicating with collection tank, the third branch pipe (23) for communicating with product tank and the fourth branch pipe (24) for communicating with regeneration tank are provided on the outlet pipeline (2) and are communicated; Valves are provided on the outlet pipeline (2), import pipeline (3), first branch pipe (21), second branch pipe (22), third branch pipe (23) and fourth branch pipe (24). A magnetic pump (4) is provided on the import pipeline (3), and a filter (5) is provided between the magnetic pump (4) and the resin tank (1).

2. A wastewater recovery apparatus as claimed in claim 1, characterised in that, A pipeline for blowing compressed air is connected to the top of the resin tank (1), and an acid inlet (61) and an alkali inlet (62) are provided on the pipeline between the magnetic pump (4) and the resin tank (1).

3. A wastewater recovery apparatus as claimed in claim 1, wherein, The utility model relates to a kind of resin tank, outlet pipeline (2) and the import pipeline (3) that can alternatively communicate with adjusting barrel, pure water barrel and regeneration barrel; 4. A recovery process according to claim 1, comprising a wastewater recovery apparatus according to any one of claims 1 to 3, characterized in that, S1: the import pipeline (3) is communicated with adjusting barrel, waste water is entered into resin tank (1) after being filtered by filter (5) and reacts, the concentration of nickel ions at the outlet of resin tank (1) is detected, when the concentration is lower than the set value, it is washed from adjusting barrel to waste water tank, when the concentration is higher than the set value, it is washed from adjusting barrel back to collection tank; S2: the import pipeline (3) is communicated with pure water barrel, and pure water washes the tank body of resin tank (1), when collection tank is lower than operating liquid level, it is washed from pure water barrel back to collection tank; S3: compressed air purges the tank body of resin tank (1), and residual moisture is discharged to waste water tank; S4: acid circulation, when the top conductivity is lower than the set value, sulfuric acid is supplemented to the tank body of resin tank (1); S5: compressed air purges the tank body of resin tank (1), and nickel sulfate solution is blown out to product tank; S6: the import pipeline (3) is communicated with regeneration barrel, and residual nickel sulfate solution is washed from regeneration barrel and added to product tank; S7: liquid alkali stage, the import pipeline (3) is communicated with pure water barrel, and liquid alkali is mixed with pure water, continuously added from the bottom to resin tank (1), and discharged to waste water tank. In S3 step, after compressed air purging, the import pipeline (3) is communicated with regeneration barrel, and sulfuric acid is mixed with solution in regeneration barrel, added from the top to resin tank (1), and washed to waste water tank.

5. A recovery process according to claim 4, wherein, In S3 step, after compressed air purging, the import pipeline (3) is communicated with regeneration barrel, and sulfuric acid is mixed with solution in regeneration barrel, added from the bottom to resin tank (1), and washed to waste water tank.

6. A recycling process according to claim 5, wherein, In S4 step, after the top conductivity meets the standard, additional circulation is performed for twenty minutes.

7. A recycling process according to claim 4, wherein, In S7 step, before liquid alkali is added, the import pipeline (3) is communicated with pure water barrel, and residual solution is washed with pure water and supplemented to regeneration barrel until regeneration barrel reaches operating liquid level, and then the system is continuously washed with pure water until the conductivity is lower than the set value.

8. A recycling process according to claim 4, wherein, After S7 step, internal circulation is performed for six minutes to absorb liquid alkali in pipeline.

9. A recycling process according to claim 4, wherein, After internal circulation is performed for six minutes, the system is continuously washed with pure water to waste water treatment until the bottom conductivity is lower than the set value.

10. A recycling process according to claim 9, wherein, ​

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