Silver-containing wastewater treatment device

Abstract

A silver-containing wastewater treatment device comprises a silver-containing wastewater storage tank, a first bag filter, a first anion bed resin tank, an intermediate tank, a second bag filter, a first strong cation bed resin tank and a water outlet tank, the silver-containing wastewater storage tank is connected with the first bag filter, the first bag filter is connected with the first anion bed resin tank, and the second bag filter is connected with the second anion bed resin tank. The first anion bed resin tank is connected with the middle tank, the silver-containing wastewater storage tank is further connected with the middle tank, the middle tank is connected with the second bag type filter, the second bag type filter is connected with an inlet of the first strong cation bed resin tank, and an outlet of the first strong cation bed resin tank is connected with an inlet of the water outlet tank. According to the utility model, the anion resin is firstly utilized to improve the pH value of the wastewater and reduce the concentration of H < + >, so that the interference of H < + > is greatly reduced when the strong cation resin adsorbs Ag < + >, and the removal efficiency of Ag < + > is improved. After passing through the anion resin, a part of wastewater and a part of raw water are subjected to acid-base neutralization in the intermediate tank, so that the load of the anion resin is reduced, and the use amount of the anion resin is reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemistry, in particular to a silver-containing wastewater treatment technology, in particular to a silver-containing wastewater treatment device. Background Art

[0002] The main treatment methods for silver-containing wastewater include chemical coagulation, electrolysis, and ion exchange. Chemical coagulation is widely used because of its low construction cost and simple operation. However, with the increasing emission standards, chemical coagulation can no longer meet the emission requirements; electrolysis is rarely used because of its high operating cost; ion exchange is relatively widely used in the industry because of its small footprint, simple process, and clear removal target. The commonly used resins in ion exchange are generally chelating resins and strong cationic resins. Although chelating resins have strong selective adsorption capacity, they are generally for ions above 2+. However, the selective adsorption capacity for 1+ ions such as Ag+ is relatively weak, and the removal effect is not good; strong cationic resins have strong adsorption capacity for cations such as H+, Na+, and Ag+, but the pH of silver-containing wastewater is acidic. In addition to Ag+, the water also contains a large amount of H+, which will greatly interfere with the adsorption of Ag+ by strong cationic resins, and the removal effect is not good. Summary of the invention

[0003] The utility model aims to provide a treatment device for silver-containing wastewater, which aims to solve the technical problem that the silver ion removal effect in the prior art is not good enough.

[0004] The utility model discloses a treatment device for silver-containing wastewater, comprising a silver-containing wastewater storage tank, a first bag filter, a first anion bed resin tank, an intermediate tank, a second bag filter, a first strong cation bed resin tank and a water outlet tank, wherein the outlet of the silver-containing wastewater storage tank is connected to the inlet of the first bag filter through a first raw water delivery pump and a pipeline, the outlet of the first bag filter is connected to the inlet of the first anion bed resin tank through a first PH online monitor, a first pneumatic valve and a pipeline, the outlet of the first anion bed resin tank is connected to the inlet of the intermediate tank through a second pneumatic valve and a pipeline, the outlet of the silver-containing wastewater storage tank is also connected to the inlet of the intermediate tank through a second raw water delivery pump and a pipeline, the intermediate tank is provided with a second PH online monitor, the outlet of the intermediate tank is connected to the inlet of the second bag filter through the intermediate tank delivery pump and a pipeline, the outlet of the second bag filter is connected to the inlet of the first strong cation bed resin tank through a first silver content online monitor, a third pneumatic valve and a pipeline, and the outlet of the first strong cation bed resin tank is connected to the inlet of the water outlet tank through a second silver content online monitor, a fourth pneumatic valve and a pipeline.

[0005] Furthermore, it also includes a second anion bed resin tank and a second strong cation bed resin tank, the outlet of the first bag filter is also connected to the inlet of the second anion bed resin tank through the fifth switching pneumatic valve and the pipeline, the outlet of the second anion bed resin tank is connected to the inlet of the middle tank through the sixth pneumatic valve and the pipeline, the outlet of the second bag filter is also connected to the inlet of the second strong cation bed resin tank through the first silver content online monitor, the seventh pneumatic valve and the pipeline, the outlet of the second strong cation bed resin tank is connected to the inlet of the water outlet tank through the third silver content online monitor, the eighth pneumatic valve and the pipeline.

[0006] Compared with the prior art, the utility model has a positive and obvious effect. The utility model first uses anion resin to increase the pH of wastewater and reduce the H+ concentration, so that the interference of H+ when the strong cationic resin adsorbs Ag+ will be greatly reduced, which not only improves the removal efficiency of Ag+ and ensures the water quality of the effluent, but also extends the service life of the resin and saves operating costs. After a part of the wastewater passes through the anion resin, it is neutralized with acid and alkali with a part of the raw water in the middle tank, which not only reduces the load of the anion resin, reduces the use of the anion resin, but also reduces the use of the regeneration agent, saving investment and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the left part of a treatment device for silver-containing wastewater according to the utility model.

[0008] Figure 2 This is a schematic diagram of the right part of a treatment device for silver-containing wastewater according to the utility model. DETAILED DESCRIPTION

[0009] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0010] like Figure 1 and Figure 2As shown, a treatment device for silver-containing wastewater of the utility model comprises a silver-containing wastewater storage tank 100, a first bag filter 20, a first anion bed resin tank 31, an intermediate tank 400, a second bag filter 50, a first strong cation bed resin tank 61 and a water outlet tank 700, wherein the outlet of the silver-containing wastewater storage tank 100 is connected to the inlet of the first bag filter 20 via a first raw water delivery pump 41 and a pipeline 11, the outlet of the first bag filter 20 is connected to the inlet of the first anion bed resin tank 31 via a first PH online monitor 71, a first pneumatic valve 311 and a pipeline 21, and the outlet of the first anion bed resin tank 31 is connected to the intermediate tank 400 via a second pneumatic valve 312, a pipeline 22 and a first cation bed resin tank 31. 400, the outlet of the silver-containing wastewater storage tank 100 is also connected to the inlet of the intermediate tank 400 through the second raw water delivery pump 42 and the pipeline, the intermediate tank 400 is provided with a second PH online monitor 72, the outlet of the intermediate tank 400 is connected to the inlet of the second bag filter 50 through the intermediate tank delivery pump 43 and the pipeline, the outlet of the second bag filter 50 is connected to the inlet of the first strong cation bed resin tank 61 through the first silver content online monitor 73, the third pneumatic valve 611, and the pipeline 31, and the outlet of the first strong cation bed resin tank 61 is connected to the inlet of the water outlet tank 700 through the second silver content online monitor 74, the fourth pneumatic valve 612, and the pipeline 32.

[0011] Furthermore, it also includes a second anion bed resin tank 32 and a second strong cation bed resin tank 62. The outlet of the first bag filter 20 is also connected to the inlet of the second anion bed resin tank 32 via the fifth switching pneumatic valve 321 and the pipeline 21. The outlet of the second anion bed resin tank 32 is connected to the inlet of the intermediate tank 400 via the sixth pneumatic valve 322 and the pipeline 22. The outlet of the second bag filter 50 is also connected to the inlet of the second strong cation bed resin tank 62 via the first silver content online monitor 73, the seventh pneumatic valve 621 and the pipeline 31. The outlet of the second strong cation bed resin tank 62 is connected to the inlet of the water outlet tank 700 via the third silver content online monitor 75, the eighth pneumatic valve 622 and the pipeline 32.

[0012] Specifically, the delivery pump, bag filter, pH online monitor, pneumatic valve, anion bed resin tank, strong cation bed resin tank, silver content online monitor, etc. in this embodiment all adopt well-known solutions in the prior art, which are well known to those skilled in the art and will not be described in detail here.

[0013] The working principle of this embodiment:

[0014] The delivery pump 41 pumps the silver-containing wastewater in the silver-containing wastewater storage tank 100 into the first bag filter 20 through the pipeline 11. After being filtered by the first bag filter 20, the silver-containing wastewater enters the first anion bed resin tank 31 and the second anion bed resin tank 32 through the pipeline 21. The first pH online monitor 71 is used to detect the pH of the silver-containing wastewater in the pipeline 21. The anion resins in the first anion bed resin tank 31 and the second anion bed resin tank 32 adsorb anions such as COOH- in the wastewater and release OH-, and the pH of the silver-containing wastewater increases to about 7-11. Afterwards, the effluents of the first anion bed resin tank 31 and the second anion bed resin tank 32 are discharged into the middle tank 400 through the pipeline 22. At the same time, the delivery pump 42 pumps the silver-containing wastewater in the silver-containing wastewater storage tank 100 into the intermediate tank 400 through the pipeline 12. The raw water pH of the silver-containing wastewater is acidic at about 2, and the water from the first anion bed resin tank 31 and the second anion bed resin tank 32 is neutralized in the intermediate tank 400 to control the pH in the intermediate tank 400 to be above 4-7. The purpose of this is not only to reduce the load of the anion resin, reduce the amount of anion resin used, but also reduce the amount of regeneration agent used, saving operating costs. The second pH online monitor 72 is used to detect the pH of the mixed wastewater in the intermediate tank 400 and control the start and stop of the raw water delivery pump 42. Then, the mixed wastewater in the intermediate tank 400 is delivered to the second bag filter 50 through the intermediate tank delivery pump 43. After being filtered by the second bag filter 50, the mixed wastewater enters the first strong cation bed resin tank 61 and the second strong cation bed resin tank 62 through the pipeline 31. The function of the first silver content online monitor 73 is to detect the concentration of Ag+ in the silver-containing wastewater in the pipeline 31. The mixed wastewater passes through the first strong cationic bed resin tank 61 and the second strong cationic bed resin tank 62, and the strong cationic resin therein adsorbs Ag+ and residual H+ in the wastewater. Afterwards, the outlets of the first strong cationic bed resin tank 61 and the second strong cationic bed resin tank 62 are discharged into the water outlet tank 700 through the pipeline 32. The second silver content online monitor 74 and the third silver content online monitor 75 are used to detect the Ag+ concentration of the water outlet of the strong cationic bed resin tank.

[0015] During normal operation, one of the first anion bed resin tank 31 and the second anion bed resin tank 32 is in use and the other is in standby, and they are operated in parallel. When one group needs to be regenerated, it is adjusted to the standby line by opening and closing the first pneumatic valve 311, the fifth switching pneumatic valve 321, the second pneumatic valve 312, and the sixth pneumatic valve 322. One of the first strong cation bed resin tank 61 and the second strong cation bed resin tank 62 is in use and the other is in standby, and they are operated in parallel. When one group of strong cation bed resin tanks is saturated, it is adjusted to the standby line by opening and closing the third pneumatic valve 611, the seventh pneumatic valve 621, the fourth pneumatic valve 612, and the eighth pneumatic valve 622, so that the saturated resin tank can replace the resin.

[0016] The utility model first uses anion resin to increase the pH of wastewater and reduce the H+ concentration, so that the interference of H+ when the strong cationic resin adsorbs Ag+ will be greatly reduced, which not only improves the removal efficiency of Ag+ and ensures the water quality of the effluent, but also prolongs the service life of the resin and saves operating costs. After a part of the wastewater passes through the anion resin, it is neutralized with a part of the raw water in the middle tank, which not only reduces the load of the anion resin, reduces the use of the anion resin, but also reduces the use of the regeneration agent, saving investment and operating costs.

Claims

1. A treatment device for silver-containing wastewater, characterized in that: It includes a silver-containing wastewater storage tank, a first bag filter, a first anion bed resin tank, an intermediate tank, a second bag filter, a first strong cation bed resin tank and a water outlet tank. The outlet of the silver-containing wastewater storage tank is connected to the inlet of the first bag filter through a first raw water delivery pump and a pipeline. The outlet of the first bag filter is connected to the inlet of the first anion bed resin tank through a first PH online monitor, a first pneumatic valve and a pipeline. The outlet of the first anion bed resin tank is connected to the inlet of the intermediate tank through a second pneumatic valve and a pipeline. The outlet of the silver-containing wastewater storage tank is also connected to the inlet of the intermediate tank through a second raw water delivery pump and a pipeline. The intermediate tank is provided with a second PH online monitor. The outlet of the intermediate tank is connected to the inlet of the second bag filter through the intermediate tank delivery pump and a pipeline. The outlet of the second bag filter is connected to the inlet of the first strong cation bed resin tank through a first silver content online monitor, a third pneumatic valve and a pipeline. The outlet of the first strong cation bed resin tank is connected to the inlet of the water outlet tank through a second silver content online monitor, a fourth pneumatic valve and a pipeline.

2. A treatment device for silver-containing wastewater according to claim 1, characterized in that: It also includes a second anion bed resin tank and a second strong cation bed resin tank. The outlet of the first bag filter is also connected to the inlet of the second anion bed resin tank via a fifth switching pneumatic valve and a pipeline. The outlet of the second anion bed resin tank is connected to the inlet of the middle tank via a sixth pneumatic valve and a pipeline. The outlet of the second bag filter is also connected to the inlet of the second strong cation bed resin tank via a first silver content online monitor, a seventh pneumatic valve and a pipeline. The outlet of the second strong cation bed resin tank is connected to the inlet of the water outlet tank via a third silver content online monitor, an eighth pneumatic valve and a pipeline.

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