Filtering device for low-concentration copper-containing wastewater

Abstract

The utility model discloses a filtering device for low-concentration copper-containing wastewater. Comprising a grating tank used for collecting low-concentration copper-containing wastewater, a first pH adjusting tank communicated with the grating tank, a coagulation and flocculation tank communicated with the first pH adjusting tank, a first sedimentation tank communicated with the coagulation and flocculation tank, a second pH adjusting tank communicated with the first sedimentation tank, and a third pH adjusting tank communicated with the second sedimentation tank, a ceramic membrane filtration module used for filtering suspended solids is arranged between the first pH regulation tank and the coagulation flocculation tank, the first pH regulation tank is used for regulating the pH value of the low-concentration copper-containing wastewater to be weak acidic, and the second pH regulation tank is used for regulating the pH value of the low-concentration copper-containing wastewater to be weak acidic; according to the filtering device for the low-concentration copper-containing wastewater, disclosed by the utility model, the waste liquid containing medium-concentration and low-concentration copper ions is enriched and recycled, so that the pollutant emission can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wastewater filtration, particularly to a low-concentration copper-containing wastewater filtration device. BACKGROUND

[0002] A large amount of copper-containing wastewater is generated in the processing of metal components, which is a kind of industrial wastewater with large discharge volume, wide sources and certain harm to human health. Direct discharge not only causes environmental pollution problems, but also causes a large amount of waste of copper resources.

[0003] For the treatment of copper-containing wastewater, the methods currently used include coagulation sedimentation, adsorption, electrolysis, ion exchange, ultrafiltration and biological treatment, but all have certain deficiencies. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a low-concentration copper-containing wastewater filtration device, which can enrich and recycle wastewater containing medium and low concentration of copper ions, reduce the discharge of pollutants and save water resources.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a low-concentration copper-containing wastewater filtration device, which comprises: a grid pool for collecting low-concentration copper-containing wastewater, a first pH adjusting pool in communication with the grid pool, a coagulation and flocculation pool in communication with the first pH adjusting pool, a first sedimentation pool in communication with the coagulation and flocculation pool, a second pH adjusting pool in communication with the first sedimentation pool, a second sedimentation pool in communication with the second pH adjusting pool, and a centrifugal dewatering machine in communication with the second sedimentation pool, a ceramic membrane filtration module for filtering suspended solids is arranged between the first pH adjusting pool and the coagulation and flocculation pool, the first pH adjusting pool is used to adjust the pH value of the low-concentration copper-containing wastewater to weak acidity to facilitate the initial precipitation of the interference factors, and the second pH adjusting pool is used to adjust the pH value of the sludge mixture after precipitation to weak alkalinity to facilitate the dissolution of copper precipitates to release the anions of the capturing agent.

[0006] In a preferred embodiment of the utility model, the inorganic ceramic membrane used in the ceramic membrane filtration module is a silicon carbide inorganic ceramic membrane, an aluminum oxide inorganic ceramic membrane or a titanium dioxide inorganic ceramic membrane.

[0007] In a preferred embodiment of the utility model, the pore size of the inorganic ceramic membrane is 6-12 μm.

[0008] In a preferred embodiment of the utility model, the coagulation and flocculation pool is connected with a medicament feeding box, and the medicament feeding box feeds copper ion capturing agent into the coagulation and flocculation pool.

[0009] In a preferred embodiment of the present application, the copper ion capturing agent is oxalic acid, sodium oxalate and derivatives of oxalic acid.

[0010] In a preferred embodiment of the present application, the first pH adjusting tank is used to adjust the pH value of the low-concentration copper-containing wastewater to between 3 and 5.

[0011] In a preferred embodiment of the present application, the second pH adjusting tank adjusts the pH value of the sludge-water mixture after precipitation to between 9 and 10.

[0012] In a preferred embodiment of the present application, the first sedimentation tank is connected with a discharge tank for collecting the supernatant obtained by rough separation of the first sedimentation tank.

[0013] In a preferred embodiment of the present application, a first reflux pipeline is arranged between the second sedimentation tank and the first pH adjusting tank, and the first reflux pipeline is used to deliver the supernatant separated from the second sedimentation tank back into the first pH adjusting tank.

[0014] In a preferred embodiment of the present application, a second reflux pipeline is arranged between the centrifugal dewatering machine and the first pH adjusting tank, and the second reflux pipeline is used to deliver the centrifugal water separated from the centrifugal dewatering machine back into the first pH adjusting tank.

[0015] The filter device of the present application is suitable for the production process of substance purification of low-concentration copper-containing wastewater, and can enrich and resourceize the waste liquid containing medium-low concentration copper ions, has great utilization value for useful ions in the concentrated and purified wastewater, and can recycle the wastewater, reduce pollutant emission and save water resources. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor, and the drawings are as follows:

[0017] Figure 1 The structure diagram of the filter device for low-concentration copper-containing wastewater of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0019] Please refer to Figure 1 The utility model discloses a kind of filtering devices of low-concentration copper-containing wastewater, comprising: with the low-concentration copper-containing wastewater pipeline connection's grid pool 1, with the first pH adjusting pool 2 being communicated with grid pool, with the coagulation flocculation pool 3 being communicated with first pH adjusting pool, with the first sedimentation tank 4 being communicated with coagulation flocculation pool, with the second pH adjusting pool 5 being communicated with first sedimentation tank, with the second sedimentation tank 6 being communicated with second pH adjusting pool, and with the centrifugal dehydrator 7 being communicated with second sedimentation tank, first pH adjusting pool and coagulation flocculation pool between being provided with ceramic membrane filtration module 8 for filtering suspended solids, wherein, inorganic ceramic membrane used by ceramic membrane filtration module is silicon carbide inorganic ceramic membrane, alumina inorganic ceramic membrane or titanium dioxide inorganic ceramic membrane, the pore size of inorganic ceramic membrane is 6~12 μm, copper ion concentration in wastewater is not higher than 3000 mg / L in principle generally, ceramic membrane filtration module is mainly to remove suspended solids (SS), and SS is controlled below 10 mg / L, and it is best to be controlled below 2 mg / L, the inorganic ceramic membrane can resist the impact of strong acidic solution.

[0020] Specifically, the first pH adjusting pool is used for adjusting the pH value of low-concentration copper-containing wastewater to weak acidity to facilitate the initial precipitation of the interference factor forming precipitation, and the second pH adjusting pool is used for adjusting the pH value of the sludge-water mixture after precipitation to weak alkalinity to facilitate the dissolution of copper precipitate to release the anion of the capturing agent. The copper ion capturing agent is oxalic acid, sodium oxalate, and derivatives of oxalic acid. The first pH adjusting pool is used for adjusting the pH value of low-concentration copper-containing wastewater to between 3 and 5, and the second pH adjusting pool is used for adjusting the pH value of the sludge-water mixture after precipitation to between 9 and 10. The copper precipitate can be dissolved under alkaline conditions to release the anion of the capturing agent, i.e., the capturing agent can be regenerated under alkaline conditions.

[0021] Specifically, the coagulation flocculation pool is connected with a medicament feeding box 9, the medicament feeding box feeds the coagulation flocculation pool with a copper ion capturing agent. The coagulation flocculation pool mainly feeds the coagulation flocculation pool with the copper ion capturing agent, and an acidic adjusting agent is needed to control the pH value of the reaction. The acidic adjusting agent can be sulfuric acid, nitric acid, hydrochloric acid, or a mixture thereof, and sulfuric acid and nitric acid are preferred. The copper precipitate has a certain solubility under acidic conditions, and the solubility is the largest in the presence of hydrochloric acid, but is still less than 2 g / L.

[0022] Specifically, the first sedimentation tank is used for roughly separating copper precipitate from water into supernatant and sludge-water mixture, and the first sedimentation tank is connected with a discharge tank 10 for collecting the supernatant obtained by the rough separation of the first sedimentation tank, wherein the supernatant is directly discharged into the discharge tank for further treatment by the wastewater treatment facility, and the sludge-water mixture enters a second pH adjusting tank, wherein a first reflux pipeline 11 is arranged between the second sedimentation tank and the first pH adjusting tank, the first reflux pipeline is used for conveying supernatant separated from the second sedimentation tank back into the first pH adjusting tank, a second reflux pipeline 12 is arranged between the centrifugal dewatering machine and the first pH adjusting tank, the second reflux pipeline is used for conveying centrifugal water separated from the centrifugal dewatering machine back into the first pH adjusting tank, and the second sedimentation tank functions the same as the first sedimentation tank, that is, the second sedimentation tank is used for roughly separating copper hydroxide precipitate from water phase (supernatant), wherein the supernatant of the second sedimentation tank contains regenerated copper ion capturing agent, is conveyed to the first pH adjusting tank through the first reflux pipeline, the sludge-water mixture enters the centrifugal dewatering machine for accurate separation of sludge and water, wherein the water phase contains regenerated copper ion capturing agent, is conveyed to the first pH adjusting tank through the second reflux pipeline, and the sludge is subjected to subsequent dewatering and purification treatment.

[0023] The present application has the advantages that it is suitable for the purification of low-concentration copper-containing wastewater and other production processes, and can enrich and recycle the wastewater containing low-concentration copper ions, thereby reducing pollutant emissions and saving water resources.

[0024] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A filtering device for low concentration copper-containing wastewater, characterized by, The application relates to a device for collecting low-concentration copper-containing wastewater, which comprises a grid pool, a first pH adjusting pool connected with the grid pool, a coagulation and flocculation pool connected with the first pH adjusting pool, a first sedimentation pool connected with the coagulation and flocculation pool, a second pH adjusting pool connected with the first sedimentation pool, a second sedimentation pool connected with the second pH adjusting pool, and a centrifugal dewatering machine connected with the second sedimentation pool. The inorganic ceramic membrane used in the ceramic membrane filtration module is a silicon carbide inorganic ceramic membrane, an aluminum oxide inorganic ceramic membrane or a titanium dioxide inorganic ceramic membrane.

2. The filtering device for low-concentration copper-containing wastewater according to claim 1, characterized in that, The pore size of the inorganic ceramic membrane is 6-12 mu m.

3. The filtering device for low concentration copper-containing wastewater according to claim 2, characterized in that, The coagulation and flocculation pool is connected with a medicament feeding box which feeds a copper ion capturing agent into the coagulation and flocculation pool.

4. The filtering device for low-concentration copper-containing wastewater according to claim 1, characterized in that, The copper ion capturing agent is oxalic acid, sodium oxalate or a derivative of oxalic acid.

5. The device for filtering low-concentration copper-containing wastewater according to claim 4, characterized in that, The first pH adjusting pool is used for adjusting the pH value of the low-concentration copper-containing wastewater to 3-5.

6. The device for filtering low-concentration copper-containing wastewater according to claim 1, characterized in that, The second pH adjusting pool is used for adjusting the pH value of the sludge-water mixture after precipitation to 9-10.

7. The device for filtering low-concentration copper-containing wastewater according to claim 1, characterized in that, The first sedimentation pool is connected with a discharge pool which is used for collecting the supernatant obtained by rough separation of the first sedimentation pool.

8. The device for filtering low-concentration copper-containing wastewater according to claim 1, characterized in that, The second sedimentation pool is provided with a first backflow pipeline between the first pH adjusting pool, and the first backflow pipeline is used for conveying the supernatant separated from the second sedimentation pool back into the first pH adjusting pool.

9. The device for filtering low-concentration copper-containing wastewater according to claim 1, characterized in that, The centrifugal dewatering machine is provided with a second backflow pipeline between the first pH adjusting pool, and the second backflow pipeline is used for conveying the centrifugal water separated from the centrifugal dewatering machine back into the first pH adjusting pool.

10. The device for filtering low-concentration copper-containing wastewater according to claim 1, characterized in that, ​

Images