Battery filter aid wastewater acid-base treatment device

Abstract

The utility model relates to battery wastewater treatment field, concretely is battery filter aid wastewater preparation acid -base treatment device, include: wastewater tank, ceramic membrane filtration module, chelate resin column hard removal module, mixing module, bipolar membrane preparation acid -base module, acid storage tank, alkali storage tank, wherein, acid storage tank is connected with chelate resin column hard removal module through pipeline to realize through the heavy metal ion in chelate resin column hard removal module of acid liquid in acid storage tank removal, alkali storage tank is connected with ceramic membrane filtration module through pipeline to realize through the lye cleaning ceramic membrane filtration module in alkali storage tank. In this application, ceramic membrane filtration module can effectively intercept the suspended impurities in battery filter aid wastewater, chelate resin column hard removal module can effectively remove the heavy metal ion in wastewater, reduce the hardness of wastewater, and can clean chelate resin column hard removal module through acid liquid, make it restore chelating ability.

Description

Technical Field

[0001] This utility model relates to the field of battery wastewater treatment, and in particular to an acid-base treatment device for battery filter aid wastewater. Background Technology

[0002] Battery filter aids, as key auxiliary materials in battery production, require large amounts of acid and alkali reagents for synthesis, resulting in production wastewater characterized by high salinity, high conductivity, and suspended impurities. Currently, the industry mostly uses MVR (Mechanical Vapor Recompression) evaporation technology to treat this type of high-salinity wastewater. However, this technology has significant drawbacks: the original suspended impurities in the wastewater (such as precipitated proteins) cannot be effectively removed, resulting in poor salt quality from the MVR system, often accompanied by black spot impurities, failing to meet resource recovery requirements; at the same time, MVR can only reduce the volume of wastewater and cannot recover acid and alkali resources from the wastewater, causing raw material waste and economic losses.

[0003] In existing high-salinity wastewater pretreatment technologies, conventional filter bags (such as 20-mesh) cannot remove fine suspended impurities, while ordinary organic membranes are susceptible to corrosion in high-salinity environments, experience rapid flux decline, and are difficult to clean and restore. In the acid and alkali preparation stage, traditional electrolysis methods are energy-intensive and produce low acid and alkali concentrations, while ion exchange methods have high resin regeneration costs; neither is suitable for treating battery filter aid wastewater. Therefore, there is an urgent need to develop an integrated treatment technology that combines high-efficiency impurity removal, high concentration ratio, low energy consumption, and stable preparation of high-concentration acids and alkalis to address the pain points of existing processes. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides a device for treating acid and alkali in battery filter aid wastewater.

[0005] A battery filter aid wastewater acid-alkali treatment device includes: a wastewater tank, a ceramic membrane filtration module, a chelating resin column hardening removal module, a mixing module, a bipolar membrane acid-alkali treatment module, an acid storage tank, and an alkali storage tank. The wastewater tank is connected to the ceramic membrane filtration module via two pipes, forming a circulating filtration module. The wastewater tank is also connected to the chelating resin column hardening removal module via two pipes, forming a circulating hardening removal module. The wastewater tank is connected to the bipolar membrane acid-alkali treatment module via two pipes to supply saline wastewater to the module. The bipolar membrane acid-alkali treatment module is connected to the acid storage tank via two pipes to discharge acid into the storage tank. The bipolar membrane acid-alkali treatment module is connected to the alkali storage tank via two pipes to discharge alkali into the storage tank. The acid storage tank is also connected to the chelating resin column hardening removal module via a pipe to remove heavy metal ions from the module using acid within the storage tank. The alkali storage tank is also connected to the ceramic membrane filtration module via a pipe to clean the module using alkali within the storage tank.

[0006] Furthermore, a water inlet pipe is connected to the connecting pipe between the acid storage tank and the chelating resin column hardening module, so as to dilute the acid solution during the process of passing the acid solution in the acid storage tank into the chelating resin column hardening module.

[0007] Furthermore, a water inlet pipe is also connected to the connecting pipe between the alkali storage tank and the ceramic membrane filter module, so as to dilute the alkali solution during the process of passing the alkali solution in the alkali storage tank into the ceramic membrane filter module.

[0008] Furthermore, a mixing module is also installed on the connecting pipe between the acid storage tank and the chelating resin column hardening module, as well as on the connecting pipe between the alkali storage tank and the ceramic membrane filter module.

[0009] Furthermore, both the ceramic membrane filtration module and the chelated resin column hardening module are equipped with sewage discharge pipes.

[0010] Furthermore, the mixing module includes a drive tube A, a drive tube B, a mixing tube, an inlet, a rotating shaft, a spiral blade, a stirring rod, and a support. Drive tube A, the mixing tube, and drive tube B are connected sequentially. The inlet is fixedly connected to the circumferential surface of the mixing tube. Supports are provided at the connections between drive tube A and the mixing tube, and at the connections between drive tube B and the mixing tube. The rotating shaft is mounted on two supports and is rotatably connected to the supports. Spiral blades are provided inside both the rotating shaft and drive tube B. A stirring rod is provided inside the mixing tube, and both the spiral blades and the stirring rod are fixedly connected to the rotating shaft. One of drive tubes A and B is connected to a water inlet pipe, and the other serves as an outlet, connected to one of the ceramic membrane filtration module and the chelating resin column hardening module. The inlet is used to receive acid or alkali solutions and is connected to one of the acid storage tank and the alkali storage tank.

[0011] Furthermore, check valves are installed on the connecting pipes of the acid storage tank and the chelating resin column hardening module, the connecting pipes of the alkali storage tank and the ceramic membrane filter module, the connecting pipes of the water inlet pipe and the ceramic membrane filter module, and the connecting pipes of the water inlet pipe and the chelating resin column hardening module.

[0012] The technical effects and advantages of this utility model are as follows: In this application, the ceramic membrane filtration module can effectively trap suspended impurities (such as protein substances) in battery filter aid wastewater, making the permeate clear and transparent, solving the problem of black spots in the MVR salt output, and improving salt quality; moreover, the ceramic membrane is resistant to high salt and high temperature, and the flux recovery rate after cleaning is over 97%, with a long service life. In this application, the chelating resin column hardening module can effectively remove heavy metal ions from wastewater, reduce the hardness of wastewater, and restore its chelating ability by cleaning the chelating resin column hardening module with acid.

[0013] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0014] Figure 1 A schematic diagram of a battery filter aid wastewater acid-alkali treatment device is shown. Figure 2 This diagram shows the structure of the mixing module in the battery filter aid wastewater acid-alkali treatment device; Figure 3 This diagram shows the structure of the mixing module in the battery filter aid wastewater acid-alkali treatment device; Figure 4 This diagram illustrates the working principle of the bipolar membrane acid-alkali production module in a battery filter aid wastewater treatment device. In the diagram: 1-Wastewater tank, 2-Ceramic membrane filtration module, 3-Chlorinated resin column hardening removal module, 4-Mixing module, 5-Bipolar membrane acid and alkali production module, 6-Acid storage tank, 7-Alkali storage tank; 41-Drive tube A, 42-Drive tube B, 43-Mixing tube, 44-Inlet, 45-Shaft, 46-Helical blade, 47-Stirring rod, 48-Support. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Furthermore, in this utility model, the terms "first," "second," and other similar words are not intended to imply any order, quantity, or importance, but are merely used to distinguish different elements, and the terms "upper," "lower," "left," "right," and other similar words are merely positional relationships in the accompanying drawings.

[0017] like Figure 1As shown in the figure, this application provides a battery filter aid wastewater acid-alkali treatment device, including: a wastewater tank 1, a ceramic membrane filtration module 2, a chelating resin column hardening module 3, a mixing module 4, a bipolar membrane acid-alkali treatment module 5, an acid storage tank 6, and an alkali storage tank 7. The wastewater tank 1 is connected to the ceramic membrane filtration module 2 via two pipes to form a circulating filtration module; the wastewater tank 1 is connected to the chelating resin column hardening module 3 via two pipes to form a circulating hardening removal module; the wastewater tank 1 is connected to the bipolar membrane acid-alkali treatment module 5 via two pipes to supply acid to the bipolar membrane. Alkali module 5 provides saline wastewater; the bipolar membrane acid-alkali generation module 5 is connected to acid storage tank 6 through two pipes to discharge acid into acid storage tank 6; the bipolar membrane acid-alkali generation module 5 is connected to alkali storage tank 7 through two pipes to discharge alkali into alkali storage tank 7; acid storage tank 6 is also connected to chelating resin column hardening removal module 3 through a pipe to remove heavy metal ions from chelating resin column hardening removal module 3 through acid in acid storage tank 6; alkali storage tank 7 is also connected to ceramic membrane filter module 2 through a pipe to clean ceramic membrane filter module 2 through alkali in alkali storage tank 7.

[0018] With this setup, the battery filter aid treated by the aforementioned battery filter aid wastewater acid-base treatment device includes the following steps: S1: Preprocessing, open as shown Figure 1 The valves Z1 and Z8 shown in the figure pass the wastewater in the wastewater tank 1 into the ceramic membrane filter module 2. After passing through the ceramic membrane filter, the wastewater flows back into the wastewater tank 1. After multiple cycles of filtration, solid-liquid separation of the wastewater is achieved. S2: After hardening and preprocessing, open as follows: Figure 1 The valves Z2 and Z7 shown in the figure pass the wastewater in the wastewater tank 1 into the chelating resin column hardening module 3. The chelating resin column hardening module 3 can adsorb calcium and magnesium ions in the wastewater until the hardness of the wastewater is reduced to below 10 ppm. S3: After acid and alkali treatment and hardening are completed, open as follows. Figure 1 Valves Z3 and Z6, as shown, allow wastewater from wastewater tank 1 to flow into the salt chamber of the bipolar membrane acid and alkali generation module 5, while simultaneously introducing clean water into the acid and alkali chambers of the module. A DC voltage is also supplied to the module, controlling the average current density to 300-600 A / m. 2 After running for 480 minutes, under the influence of an electric field, the bipolar film dissociates to produce H₂. + With OH - Cl in the salt chamber - Migrating through the anion membrane to the acid chamber and reacting with H... + Combine to form hydrochloric acid, Na + Migrating through the cation exchange membrane to the alkaline chamber to react with OH- - The combination produces sodium hydroxide, and this process is as follows: Figure 4 As shown; S4: Acid and alkali collection. After the acid and alkali production is completed, open as follows: Figure 1 Valves Z9 and Z10 shown collect the acid solution (HCl concentration 9.3%) in the acid chamber and the alkali solution (NaOH concentration 8.5%) in the alkali chamber, with the remaining wastewater flowing back into the wastewater tank 1.

[0019] Furthermore, during the pretreatment process, when the ceramic membrane flux decreases to the specified threshold (from a maximum of 150 LMH to a minimum of 56 LMH), valves Z1 and Z8 are closed, and the diluted alkali solution (2% NaOH) in the alkali storage tank 7 is introduced into the ceramic membrane filter module 2. 2000 ppm of available chlorine cleaning solution is then introduced into the ceramic membrane filter module 2 and cleaned at 55-60℃ for 45 minutes to restore the membrane flux.

[0020] During the hardening process, once the resin is saturated, valves Z1, Z2, Z7, and Z8 are closed. The diluted acid solution (1%-5% HCl) from the alkali storage tank 6 is then introduced into the hardening module 2 of the chelating resin column. The H+ in the hydrochloric acid... + It competes with heavy metal ions for chelating groups, causing the heavy metal ions to desorb (forming "regenerated waste liquid", from which heavy metals can be recovered), and the resin regains its chelating ability for recycling.

[0021] like Figure 1 As shown, in one embodiment of this application, a water inlet pipe is connected to the connecting pipe between the acid storage tank 6 and the chelating resin column hardening module 3 to dilute the acid solution during the process of introducing the acid solution from the acid storage tank 6 into the chelating resin column hardening module 3. Similarly, a water inlet pipe is also connected to the connecting pipe between the alkali storage tank 7 and the ceramic membrane filter module 2 to dilute the alkali solution during the process of introducing the alkali solution from the alkali storage tank 7 into the ceramic membrane filter module 2. At the same time, a mixing module 4 is also installed on the connecting pipes between the acid storage tank 6 and the chelating resin column hardening module 3, as well as on the connecting pipes between the alkali storage tank 7 and the ceramic membrane filter module 2, to achieve stirring of the solution. On the other hand, both the ceramic membrane filter module 2 and the chelating resin column hardening module 3 are provided with drain pipes for discharging the cleaning solution (acid solution, alkali solution).

[0022] like Figure 2 and Figure 3As shown, in one embodiment of this application, the mixing module 4 includes a drive tube A41, a drive tube B42, a mixing tube 43, a liquid inlet 44, a rotating shaft 45, a spiral blade 46, a stirring rod 47, and a bracket 48. The drive tube A41, mixing tube 43, and drive tube B42 are connected sequentially. The liquid inlet 44 is fixedly connected to the circumferential surface of the mixing tube 43. Brackets 48 are provided at the connection points of drive tube A41 and mixing tube 43, and drive tube B42 and mixing tube 43. The rotating shaft 45 is mounted on two... The rotating shaft 45 is rotatably connected to the support 48. Spiral blades 46 are installed in both the rotating shaft 45 and the drive tube B42, and a stirring rod 47 is installed in the mixing tube 43. Both the spiral blades 46 and the stirring rod 47 are fixedly connected to the rotating shaft 45. One of the drive tubes A41 and B42 is connected to the water inlet pipe, and the other serves as the water outlet, connected to one of the ceramic membrane filter module 2 and the chelating resin column hardening removal module 3. The liquid inlet 44 is used to receive acid or alkali solutions and is connected to one of the acid storage tank 6 and the alkali storage tank 7. With this configuration, when water flows through the spiral blades 46, it drives the rotating shaft 45 to rotate, thereby driving the stirring rod 47 to rotate, thus achieving the stirring function.

[0023] like Figure 1 As shown, in one embodiment of this application, check valves are installed on the connecting pipes of acid storage tank 6 and chelating resin column hardening module 3, alkali storage tank 7 and ceramic membrane filter module 2, water inlet pipe and ceramic membrane filter module 2, and water inlet pipe and chelating resin column hardening module 3.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery filter aid wastewater acid-base treatment device, characterized in that, include: The system comprises a wastewater tank (1), a ceramic membrane filtration module (2), a chelating resin column hardening removal module (3), a mixing module (4), a bipolar membrane acid and alkali production module (5), an acid storage tank (6), and an alkali storage tank (7). The wastewater tank (1) is connected to the ceramic membrane filtration module (2) via two pipes, forming a circulating filtration module. The wastewater tank (1) is also connected to the chelating resin column hardening removal module (3) via two pipes, forming a circulating hardening removal module. Furthermore, the wastewater tank (1) is connected to the bipolar membrane acid and alkali production module (5) via two pipes to supply saline wastewater to the bipolar membrane acid and alkali production module (5). The acid-base module (5) is connected to the acid storage tank (6) through two pipes to discharge acid into the acid storage tank (6); the bipolar membrane acid-base module (5) is connected to the alkali storage tank (7) through two pipes to discharge alkali into the alkali storage tank (7); the acid storage tank (6) is also connected to the chelating resin column hardening module (3) through a pipe to remove heavy metal ions in the chelating resin column hardening module (3) through the acid in the acid storage tank (6); the alkali storage tank (7) is also connected to the ceramic membrane filter module (2) through a pipe to clean the ceramic membrane filter module (2) through the alkali in the alkali storage tank (7).

2. The battery filter aid wastewater acid-base treatment device according to claim 1, characterized in that, A water inlet pipe is connected to the connecting pipe between the acid storage tank (6) and the chelating resin column hardening module (3) to dilute the acid solution during the process of passing the acid solution in the acid storage tank (6) into the chelating resin column hardening module (3).

3. The battery filter aid wastewater acid-base treatment device according to claim 2, characterized in that, A water inlet pipe is also connected to the connecting pipe between the alkali storage tank (7) and the ceramic membrane filter module (2) so as to dilute the alkali solution in the alkali storage tank (7) during the process of passing the alkali solution into the ceramic membrane filter module (2).

4. The battery filter aid wastewater acid-base treatment device according to claim 3, characterized in that, A mixing module (4) is also installed on the connecting pipe between the acid storage tank (6) and the chelating resin column hardening module (3) and on the connecting pipe between the alkali storage tank (7) and the ceramic membrane filter module (2).

5. The battery filter aid wastewater acid-base treatment device according to claim 4, characterized in that, Both the ceramic membrane filtration module (2) and the chelated resin column hardening module (3) are equipped with sewage discharge pipes.

6. The battery filter aid wastewater acid-base treatment device according to claim 4, characterized in that, The mixing module (4) includes a drive tube A (41), a drive tube B (42), a mixing tube (43), a liquid inlet (44), a rotating shaft (45), a spiral blade (46), a stirring rod (47), and a bracket (48). The drive tube A (41), the mixing tube (43), and the drive tube B (42) are connected in sequence. The liquid inlet (44) is fixedly connected to the circumferential surface of the mixing tube (43). A bracket (48) is provided at the connection between the drive tube A (41) and the mixing tube (43) and at the connection between the drive tube B (42) and the mixing tube (43). The rotating shaft (45) is mounted on two brackets (48). The shaft (45) is rotatably connected to the support (48). Spiral blades (46) are provided in both the shaft (45) and the drive tube B (42). A stirring rod (47) is provided in the mixing tube (43). The spiral blades (46) and the stirring rod (47) are fixedly connected to the shaft (45). One of the drive tubes A (41) and B (42) is connected to the water inlet pipe, and the other serves as the water outlet, connected to one of the ceramic membrane filter module (2) and the chelating resin column hardening module (3). The liquid inlet (44) is used to receive acid or alkali, and is connected to one of the acid storage tank (6) and the alkali storage tank (7).

7. The battery filter aid wastewater acid-base treatment device according to claim 4, characterized in that, Check valves are installed on the connecting pipes of the acid storage tank (6) and the chelating resin column hardening module (3), the connecting pipes of the alkali storage tank (7) and the ceramic membrane filter module (2), the connecting pipes of the water inlet pipe and the ceramic membrane filter module (2), and the connecting pipes of the water inlet pipe and the chelating resin column hardening module (3).

Images