CN219058624U - Integrated chromium-containing wastewater treatment and chromium resource recovery system - Google Patents
Integrated chromium-containing wastewater treatment and chromium resource recovery system Download PDFInfo
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- CN219058624U CN219058624U CN202222646663.3U CN202222646663U CN219058624U CN 219058624 U CN219058624 U CN 219058624U CN 202222646663 U CN202222646663 U CN 202222646663U CN 219058624 U CN219058624 U CN 219058624U
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Abstract
The utility model discloses an integrated chromium-containing wastewater treatment and chromium resource recovery system, which comprises: comprises a chromium-containing wastewater regulating tank, a wastewater lifting pump, a multi-medium filter and a secondary high-efficiency chromium-removing exchanger; the chromium-containing wastewater regulating tank comprises a water inlet and a water outlet, the water inlet is used for receiving chromium-containing wastewater, the water outlet is communicated with a wastewater lifting pump, the wastewater of the chromium-containing wastewater regulating tank is lifted by the wastewater through the outlet to a multi-medium filter, the outlet of the multi-medium filter is communicated with a secondary efficient chromium-removing exchanger, the wastewater from the multi-medium filter is sent to the secondary efficient chromium-removing exchanger to remove chromium ions in the wastewater, and the wastewater reaching the standard is discharged from a discharge port of the secondary efficient chromium-removing exchanger; the second-stage efficient chromium-removing exchanger consists of a first ion exchange column and a second ion exchange column which are connected in series, and can remove hexavalent chromium in wastewater for the first ion exchange column; then removing trivalent chromium in the wastewater through a second ion exchange column; thereby deeply removing hexavalent chromium and trivalent chromium in the wastewater.
Description
Technical Field
The utility model relates to the field of sewage treatment, in particular to an integrated chromium-containing wastewater treatment and chromium resource recovery system.
Background
Chromium plating is a common material surface treatment process, and a large amount of waste water is generated in the process, and sources include a plating part washing and bleaching process, electroplating bath waste liquid, a passivation process and the like. Anions present in the wastewater include the ions: crO (CrO) 4 2- 、Cr 2 O 7 2- 、SO 4 2- 、Cl - Cations include: cr (Cr) 3+ 、H + 、Cu 2+ 、Ni 2+ 、Zn 2+ Etc., chromium mainly exists in electroplating wastewater in two valence states: trivalent chromium (Cr (III)) and hexavalent chromium (VI)Chromium (Cr (VI)), cr (III) is derived from cations and Cr (VI) is derived from anions. Electroplating pollutant emission standards (GB 21900-2008) require Cr (VI) concentrations in the wastewater of less than 0.2mg/L [2] . At present, in the domestic regional electroplating industrial park, the chromium-containing wastewater accounts for about 20 percent of the total amount of the electroplating wastewater, the concentration is 500-1000mg/L, 0.8-1.2 tons of chromium-containing sludge (the water content is 70 percent) is generated per 100 tons of the chromium-containing wastewater, the treatment cost of one ton of chromium sludge is about 750-1500 yuan, the treatment cost of the sludge is equivalent to about 10-20 yuan/ton of water, and the treatment cost of the chromium-containing wastewater is 20-30 yuan/ton; the cost for the treatment of chromium-containing wastewater is 480-720 ten thousand yuan per year, calculated on a scale of 4000 tons/day (about 20% of chromium-containing water) of an electroplating industrial park, and 1920-2880 tons of chromium sludge are produced. Electroplating sludge has become a major problem in social environmental management.
Disclosure of Invention
In order to solve the technical problems, the utility model provides an integrated chromium-containing wastewater treatment and chromium resource recovery system, which can realize ultralow-emission floating of heavy metal chromium in effluent by treating chromium-containing wastewater through a chromium-containing wastewater advanced treatment system.
The utility model solves the technical problems by adopting the technical scheme that:
the integrated chromium-containing wastewater treatment and chromium resource recovery system comprises a wastewater treatment subsystem, a regeneration subsystem and a recycling subsystem.
The wastewater treatment subsystem comprises a chromium wastewater regulating tank, a wastewater lifting pump, a multi-medium filter and a secondary high-efficiency chromium removal exchanger which are connected in sequence; the chromium-containing wastewater regulating tank comprises a water inlet and a water outlet, the water inlet receives chromium-containing wastewater, the water outlet is communicated with a wastewater lifting pump, the wastewater of the chromium-containing wastewater regulating tank is lifted by the wastewater from an outlet to a multi-medium filter, the outlet of the multi-medium filter is communicated with a secondary efficient chromium-removing exchanger, the wastewater from the multi-medium filter is sent to the secondary efficient chromium-removing exchanger to remove chromium ions in the wastewater, and the wastewater reaching the standard is discharged from a discharge outlet of the secondary efficient chromium-removing exchanger; the second-stage efficient chromium-removing exchanger consists of a first ion exchange column and a second ion exchange column which are connected in series, and can remove hexavalent chromium in wastewater for the first ion exchange column; then removing trivalent chromium in the wastewater through a second ion exchange column; thereby deeply removing hexavalent chromium and trivalent chromium in the wastewater.
The regeneration subsystem is used for regenerating the ion exchange column in the high-efficiency chromium-removing exchanger, and chromium ions in the ion exchange column filler are removed through the regeneration subsystem, so that the simultaneous recycling of chromium metal is realized.
The regeneration subsystem comprises a device I for eluting and regenerating a first ion exchange column and a second ion exchange column in the high-efficiency chromium-removing exchanger, and comprises a device II for collecting and storing hexavalent chromium-containing regeneration liquid obtained by eluting and regenerating the first ion exchange column;
the device II comprises a regeneration liquid storage tank; the regenerated liquid storage tank is connected with the outlet of the first ion exchange column;
the recycling subsystem comprises a device III for recycling the regeneration liquid containing hexavalent chromium;
the device III of the recycling subsystem comprises a chromium plating tank; the outlet of the regenerated liquid storage tank is communicated with a chromium plating tank of the recycling system.
The recycling subsystem is used for recycling the regeneration liquid.
Further, the device I of the regeneration system comprises: hydrochloric acid dispensing and medicine storing tank, hydrochloric acid adding pump; liquid alkali dispensing and medicine storing tank, liquid alkali adding pump; a regeneration liquid storage tank; a system pipeline valve; the regeneration system pipeline shares a water inlet pipe and a water outlet pipe with the original water passing device, and the processes of water passing, acid washing, alkali regeneration, back flushing and the like are realized through valve switching; the regeneration liquid storage tank is used for storing the regeneration liquid of the first ion exchange column;
further, the water outlet of the second ion exchange column is directly communicated with the emptying pipe or is communicated with the water inlet of the first ion exchange column through the control of the valve.
Further, the wastewater treatment system also comprises a recycling system, and the recycling system is a chromium plating tank; the regeneration liquid in the regeneration liquid storage tank is communicated with a chromium plating tank of the recycling system and is used for pre-treating flushing water in the chromium plating tank.
Advantageous effects
The utility model adsorbs anions through the first exchange column and adsorbs cations through the second exchange column to form an ion exchange system, chromium ions and other cations (copper, nickel, zinc and iron) in electroplating wastewater are respectively adsorbed, the concentration of each ion in the treated wastewater meets the discharge standard, and the treated wastewater can be reused as washing water for chromium plating pretreatment, so that the treatment cost is reduced. And meanwhile, compared with the traditional precipitation method, the method reduces the occupied area.
Drawings
FIG. 1 is a schematic diagram of an integrated chromium-containing wastewater advanced treatment system;
in the figure, 1, a chromium-containing wastewater regulating tank; 2. a waste water lifting pump; 3. a porous media filter; 4. an efficient chromium removal exchanger; 4-1, a first ion exchange column; 4-2, a second ion exchange column; 5. hydrochloric acid dispensing medicine storage tank; 6. a hydrochloric acid dosing pump; 7. liquid alkali dispensing medicine storage tank; 8. liquid alkali dosing pump; 9. a regeneration liquid storage tank; 10. a chromium plating bath.
Detailed Description
Example 1
The embodiment provides an integrated chromium-containing wastewater advanced treatment system, which is shown in figure 1 and comprises a wastewater regulation subsystem, a regeneration subsystem and a recycling subsystem;
the wastewater regulation subsystem comprises a chromium-containing wastewater regulation tank 1, a wastewater lifting pump 2, a multi-medium filter 3 and a second-stage efficient chromium-removing exchanger 4, wherein a water inlet of the chromium-containing wastewater regulation tank receives chromium-containing wastewater, the wastewater passing through the chromium-containing wastewater regulation tank is lifted by the wastewater and pumped to the multi-medium filter, the wastewater treated by the multi-medium filter is sent to the second-stage efficient chromium-removing exchanger to remove chromium ions in the wastewater, the wastewater after reaching standards is discharged from a discharge port of the second-stage efficient chromium-removing exchanger, the second-stage efficient chromium-removing exchanger comprises a first exchange column 4-1 (anion exchange column) and a second exchange column 4-2 (cation exchange column), anion exchange resin is filled in the first exchange column, and cation exchange resin is arranged in the second exchange column;
the regeneration subsystem comprises a hydrochloric acid dispensing and medicine storage tank 5 and a hydrochloric acid dosing pump 6; a liquid alkali dispensing and medicine storage tank 7 and a liquid alkali adding pump 8; a regeneration liquid storage tank 9; a system pipeline valve;
the recycling subsystem is a chromium plating tank 10, and the chromium plating tank 10 is communicated with a regeneration liquid storage tank 9;
as shown in fig. 1, in the wastewater treatment subsystem, an outlet of a chromium-containing wastewater tank 1 is communicated with a wastewater lifting pump 2, the other end of the wastewater lifting pump is communicated with a water inlet of a porous medium filter 3, a water outlet of the porous medium filter 3 is communicated with a water inlet of a first ion exchange column 4-1, a water outlet of the first ion exchange column is communicated with a water inlet of a second ion exchange column, and a water outlet of the second ion exchange column is directly communicated with an emptying pipe or is communicated with a water inlet of the first ion exchange column through control of a valve;
firstly, chromium-containing wastewater enters a chromium-containing wastewater regulating tank, the water quantity and the water quality of the wastewater are regulated, and then the wastewater is lifted by a wastewater lifting pump to enter a multi-medium filter to remove suspended matters in the wastewater; the effluent of the multi-medium filter enters a second-stage efficient chromium removal exchanger, and after sequentially passing through a first exchange column and a second exchange column, hexavalent chromium and trivalent chromium in the wastewater are deeply removed, the treated effluent reaches the standard, the total chromium in the effluent is less than or equal to 0.2mg/L (which is far lower than the national emission standard, the total chromium in the effluent is less than or equal to 1.5mg /), the effluent can be directly discharged, the effluent is discharged through an emptying pipe, the treated effluent does not reach the standard, and then enters the first ion exchange column again for adsorption through a pipeline, and the effluent enters the first ion exchange column and the second ion exchange column for multiple times until the effluent reaches the standard and is discharged;
in the regeneration subsystem, an outlet of a hydrochloric acid dispensing and medicine storage tank 5 is communicated with a hydrochloric acid dosing pump 6, the other end of the hydrochloric acid dosing pump is respectively communicated with water inlets of a first ion exchange column and a second ion exchange column through parallel pipelines, an outlet of a liquid alkali dispensing and medicine storage tank 7 is communicated with a liquid alkali dosing pump 8, and the other end of the liquid alkali dosing pump is respectively communicated with water inlets of the first ion exchange column and the second ion exchange column through parallel pipelines; the field can know according to actual conditions that pipelines can be shared, and different controls can be realized through valves; the inlet of the regenerated liquid storage tank 9 is communicated with the water outlet of the first ion exchange column, and is used for storing regenerated liquid of the first ion exchange column, and the first ion exchange column is also communicated with an emptying pipe;
in the recycling subsystem, the water inlet of the chromium plating tank 10 is communicated with the water outlet of the regeneration liquid storage tank 9, and the regeneration liquid is recycled for the pretreatment flushing water in the chromium plating tank.
Example 2
The integrated chromium-containing wastewater treatment and chromium resource recovery system comprises a wastewater treatment subsystem, a regeneration subsystem and a recycling subsystem;
the wastewater treatment subsystem comprises a chromium-containing wastewater regulating tank, a wastewater lifting pump, a multi-medium filter and a secondary high-efficiency chromium-removing exchanger which are connected in sequence;
the chromium-containing wastewater regulating tank comprises a water inlet and a water outlet, the water outlet is communicated with a wastewater lifting pump, the wastewater lifting pump is connected with an inlet of a multi-medium filter, an outlet of the multi-medium filter is connected with an inlet of a high-efficiency chromium-removing exchanger, and the high-efficiency chromium-removing exchanger consists of a first ion exchange column for adsorbing and removing hexavalent chromium in wastewater and a second ion exchange column for adsorbing and removing trivalent chromium in wastewater, which are connected in series;
the regeneration subsystem comprises a device I for eluting and regenerating a first ion exchange column and a second ion exchange column in the high-efficiency chromium-removing exchanger, and comprises a device II for collecting and storing hexavalent chromium-containing regeneration liquid obtained by eluting and regenerating the first ion exchange column;
the recycling subsystem comprises a device III for recycling the regeneration liquid containing hexavalent chromium.
The device I of the regeneration subsystem comprises: hydrochloric acid dispensing and medicine storing tank, hydrochloric acid adding pump; liquid alkali dispensing and medicine storing tank, liquid alkali adding pump;
the hydrochloric acid dispensing and medicine storage tank is respectively communicated with water inlets of the first ion exchange column and the second ion exchange column through a hydrochloric acid dosing pump; the liquid alkali dispensing and medicine storage tank is respectively communicated with water inlets of the first ion exchange column and the second ion exchange column through a liquid alkali medicine adding pump.
The device II comprises a regeneration liquid storage tank; the regeneration liquid storage tank is connected with the outlet of the first ion exchange column.
The device III of the recycling subsystem comprises a chromium plating tank; the outlet of the regenerated liquid storage tank is communicated with a chromium plating tank of the recycling system.
The first ion exchange column and the second ion exchange column are respectively provided with a water inlet and a water outlet, and the pipelines of the water inlet and the water outlet of the first ion exchange column and the second ion exchange column are respectively provided with a valve.
The water outlet of the second ion exchange column is directly communicated with the emptying pipe or communicated with the water inlet of the first ion exchange column through the control of the valve.
The above embodiments are only for illustrating the technical idea of the present utility model, and the protection scope of the present utility model is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present utility model falls within the protection scope of the present utility model.
Claims (4)
1. The integrated chromium-containing wastewater treatment and chromium resource recovery system is characterized by comprising a wastewater treatment subsystem, a regeneration subsystem and a recycling subsystem;
the wastewater treatment subsystem comprises a chromium-containing wastewater regulating tank, a wastewater lifting pump, a multi-medium filter and a secondary high-efficiency chromium-removing exchanger which are connected in sequence;
the chromium-containing wastewater regulating tank comprises a water inlet and a water outlet, the water outlet is communicated with a wastewater lifting pump, the wastewater lifting pump is connected with an inlet of a multi-medium filter, an outlet of the multi-medium filter is connected with an inlet of a high-efficiency chromium-removing exchanger, and the high-efficiency chromium-removing exchanger consists of a first ion exchange column for adsorbing and removing hexavalent chromium in wastewater and a second ion exchange column for adsorbing and removing trivalent chromium in wastewater, which are connected in series;
the regeneration subsystem comprises a device I for eluting and regenerating a first ion exchange column and a second ion exchange column in the high-efficiency chromium-removing exchanger, and comprises a device II for collecting and storing hexavalent chromium-containing regeneration liquid obtained by eluting and regenerating the first ion exchange column;
the device II comprises a regeneration liquid storage tank; the regenerated liquid storage tank is connected with the outlet of the first ion exchange column;
the recycling subsystem comprises a device III for recycling the regeneration liquid containing hexavalent chromium;
the device III of the recycling subsystem comprises a chromium plating tank; the outlet of the regenerated liquid storage tank is communicated with a chromium plating tank of the recycling system.
2. The system of claim 1, wherein the means i of the regeneration subsystem comprises: hydrochloric acid dispensing and medicine storing tank, hydrochloric acid adding pump; liquid alkali dispensing and medicine storing tank, liquid alkali adding pump;
the hydrochloric acid dispensing and medicine storage tank is respectively communicated with water inlets of the first ion exchange column and the second ion exchange column through a hydrochloric acid dosing pump; the liquid alkali dispensing and medicine storage tank is respectively communicated with water inlets of the first ion exchange column and the second ion exchange column through a liquid alkali medicine adding pump.
3. The system of claim 1, wherein the first ion exchange column and the second ion exchange column are provided with a water inlet and a water outlet, respectively, and valves are provided on the pipelines of the water inlet and the water outlet of the first ion exchange column and the second ion exchange column, respectively.
4. The system of claim 1, wherein the water outlet of the second ion exchange column is in direct communication with the evacuation tube or in communication with the water inlet of the first ion exchange column by valve control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222646663.3U CN219058624U (en) | 2022-10-09 | 2022-10-09 | Integrated chromium-containing wastewater treatment and chromium resource recovery system |
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| CN202222646663.3U CN219058624U (en) | 2022-10-09 | 2022-10-09 | Integrated chromium-containing wastewater treatment and chromium resource recovery system |
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| CN202222646663.3U Active CN219058624U (en) | 2022-10-09 | 2022-10-09 | Integrated chromium-containing wastewater treatment and chromium resource recovery system |
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