Chromium-containing wastewater purification treatment device

Abstract

A chromium-containing wastewater purification treatment device comprises a reaction kettle, a neutralizer adding system, a precipitant adding system, a filtering system, a reducing agent adding system, a PH adjusting system and a control system, integrates a neutralization reaction, pH value adjustment, a precipitation reaction, precipitation standing, filtering separation and filtrate collection, and can quickly and efficiently separate out solids in a solution; and the filter assembly is replaced under the condition of no shutdown, and the device has the advantages of high integration level, high efficiency, convenience in application and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a chromium-containing wastewater purification treatment device. Background Art

[0002] Chromium-containing wastewater is widely produced in electroplating, electrophoresis, leather making and steel processing industries. It is a toxic wastewater containing heavy metals and needs to be strictly disposed of in accordance with national standards. The conventional disposal methods for chromium-containing wastewater include the following: Ion exchange resin is used to fix hexavalent chromium ions on the resin surface through anion exchange; membrane technology is used to concentrate chromium-containing wastewater. The use of ion exchange and membrane technology usually requires relatively clean chromium-containing wastewater, and the special requirements for water quality limit its widespread use; However, during the filtration process, particles can easily clog the filter holes, reducing the filtration effect and requiring shutdown for replacement and maintenance, which is a cumbersome operation. Summary of the invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a chromium-containing wastewater purification treatment device.

[0004] The present application proposes a chromium-containing wastewater purification treatment device, including a reactor, a neutralizing agent adding system, a precipitant adding system, a filtering system, a reducing agent adding system, a pH regulating system, and a control system; The filtering system includes a filter and a filtrate collecting tank. A pipe is installed at the bottom of the filter, and the pipe is fixedly connected to the top of the filtrate collecting tank. Windows are respectively provided on the inner walls on both sides of the filter, and shielding covers are respectively hingedly installed on the outer walls on both sides of the filter. The shielding covers can cover the windows. The filtering component is detachably installed in the filter, a support plate is fixedly installed on one side of the filter, and several cylinders are fixedly installed on the top surface of the support plate. The top ends of the moving ends of the cylinders are fixedly connected by a connecting plate, and a pushing component is installed on the top surface of the connecting plate.

[0005] Specifically, the filtering component includes: A filter element, wherein the filter element can be inserted into the filter through the window; Two slide grooves, the two slide grooves are respectively opened on the inner walls of the front and rear ends of the filter; A guide groove, which is provided on the inner walls of the front and rear ends of the window, the guide groove is connected to the inside of the slide groove, and one side of the guide groove is connected to the outside; Two groups of guide block groups, each group of guide block groups consists of two guide blocks, the two guide blocks in each group of guide block groups are respectively located on both sides of the filter element, the two groups of guide block groups are respectively located at the front and rear ends of the filter element, the guide blocks are fixedly connected to the filter element, the guide blocks can be inserted into the guide groove, and can slide in the slide groove.

[0006] Specifically, the pushing component includes: Two support plates, the two support plates are fixedly mounted on the top surface of the connecting plate, the two support plates are located on one side of the connecting plate, and the two support plates are respectively located at the front and rear ends of the connecting plate; A motor, wherein the motor is fixedly mounted on one side of one of the support plates; two screw rods, wherein one end of one of the screw rods is fixedly connected to the end of the output shaft of the motor, and one end of the other screw rod is movably connected to the other support plate, and a nut is provided on the screw rod in cooperation with the thread; Two vertical rods, wherein the vertical rods are located between the two nuts and are fixedly connected to the nuts, and the bottom ends of the vertical rods are in contact with the top surface of the connecting plate; Two placement plates, one side of which is fixedly connected to one side of the vertical rod; and a transmission member, which is connected to two screw rods.

[0007] Specifically, the transmission member includes two sprockets, which are fixedly mounted on one end of the screw rod and are movably connected via a chain.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The reaction liquid enters the filter and is filtered by the filter assembly. After filtering for a period of time, when the filter assembly needs to be replaced, the new filter assembly is placed on the pushing assembly, and the cylinder is extended synchronously through the control of the controller to push the pushing assembly and the filter assembly upward so that the new filter assembly is at the same level as the old filter assembly and the window. Then one of the shielding covers is flipped upward and opened, and the pushing assembly pushes the new filter assembly into the filter. Under the pushing of the new filter assembly, the old filter assembly is moved out from the other side of the filter, and the shielding cover on the other side of the filter is automatically pushed open. The pushing assembly pushes most of the new filter assembly into the filter. Finally, the staff manually pushes the remaining parts into the filter, and then flips the shielding cover downward to close the window. After the old filter assembly is pushed out, the staff uses mobile equipment or hand-lifts the filter assembly to take the old filter assembly out of the filter to complete the replacement of the filter assembly. The filter assembly can be replaced without stopping the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 It is a schematic diagram of the structure of the filter; Figure 2 yes Figure 1 A-direction view; Figure 3 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] A chromium-containing wastewater purification treatment device, such as Figure 1 As shown, it includes a reactor 1, a neutralizer adding system 2, a precipitant adding system 3, a filtering system 4, a reducing agent adding system 5, a pH adjusting system 6, and a control system; The reactor 1 is provided with an agitator inside for mixing the reaction materials, and a heating device is provided at the bottom of the reactor to control the reaction temperature; The neutralizer adding system 2 includes a neutralizer storage tank and a metering pump, which are used to accurately add a neutralizer (such as hydrobromic acid) to the reactor to adjust the pH value of the reaction solution; The precipitant adding system 3 includes a precipitant storage tank and a metering pump, which is used to add a precipitant (such as barium bromide or calcium bromide solution) to the reactor to promote the precipitation reaction; The filtering system 4 includes a filter and a filtrate collecting tank, which are used to separate the precipitate generated during the reaction process; a pipe is installed at the bottom of the filter, and the pipe is fixedly connected to the top of the filtrate collecting tank. Windows are respectively provided on the inner walls on both sides of the filter, and shielding covers are respectively hingedly installed on the outer walls on both sides of the filter, and the shielding covers can cover the windows. The filtering component is detachably installed in the filter, and a support plate 7 is fixedly installed on one side of the filter, and several cylinders 8 are fixedly installed on the top surface of the support plate 7. The top ends of the moving ends of the cylinders 8 are fixedly connected by a connecting plate 9, and a pushing component is installed on the top surface of the connecting plate 9.

[0013] The reducing agent adding system 5 includes a reducing agent storage tank and a metering pump, which are used to add a reducing agent (such as formaldehyde, formic acid, hydrazine hydrate, etc.) into the reactor to perform a reduction reaction; The pH adjustment system 6 includes a pH sensor and an automatic dosing device, which are used to monitor and adjust the pH value of the reaction solution in real time; The control system includes a PLC controller and a touch screen, which are used to control the operation of the entire device and realize automatic operation.

[0014] The reaction liquid enters the filter and is filtered by the filter assembly. After filtering for a period of time, when the filter assembly needs to be replaced, a new filter assembly is placed on the pushing assembly, and the cylinder 8 is synchronously extended through the control of the controller to push the filter assembly upward so that the new filter assembly is at the same level as the old filter assembly and the window. Then one of the shielding covers is flipped upward and opened, and the pushing assembly pushes the new filter assembly into the filter. Under the pushing of the new filter assembly, the old filter assembly is moved out from the other side of the filter, and the shielding cover on the other side of the filter is automatically pushed open. The pushing assembly pushes most of the new filter assembly into the filter. Finally, the staff manually pushes the remaining parts into the filter, and then flips the shielding cover downward to close the window. After the old filter assembly is pushed out, the staff uses mobile equipment or hand-lifts the filter assembly to take the old filter assembly out of the filter to complete the replacement of the filter assembly. The filter assembly can be replaced without stopping the machine.

[0015] Specifically, the filter assembly described in this embodiment includes: A filter element 10, wherein the filter element 10 can be inserted into the filter through the window; Two slide grooves, the two slide grooves are respectively opened on the inner walls of the front and rear ends of the filter; A guide groove 11, wherein the guide groove 11 is provided on the inner walls of the front and rear ends of the window, the guide groove 11 is connected to the inside of the slide groove, and one side of the guide groove 11 is connected to the outside; Two groups of guide block groups, each group of guide block groups consists of two guide blocks 12, the two guide blocks 12 in each group of guide block groups are respectively located on both sides of the filter element 10, and the two groups of guide block groups are respectively located at the front and rear ends of the filter element 10, the guide blocks 12 are fixedly connected to the filter element 10, and the guide blocks 12 can be inserted into the guide groove 11 and can slide in the slide groove.

[0016] The filter element 10 is composed of multiple layers of filter screens, and sealing gaskets are fixedly installed on both sides of the filter element 10. When the filter element 10 needs to be replaced, the shielding cover on the right side is flipped upwards, and the left side of the filter element 10 is placed on the window on the right side, and the right side of the filter element 10 is located on the pushing assembly. Then the pushing assembly starts to push the new filter element 10 into the filter, and the new filter element 10 holds the old filter element 10. In the process of moving the new filter element 10 into the filter, the old filter element 10 is pushed out of the filter. When the components in the pushing assembly reach the maximum moving path, most of the filter element 10 has entered the filter. At this time, the staff can push the filter element into the filter by hand or with a rod, and the old filter element has already been removed from the filter, completing the replacement of the filter element. The operation is simple, and the old filter element can be automatically replaced with the new filter element.

[0017] Furthermore, the pushing assembly described in this embodiment includes: Two support plates 13, the two support plates 13 are fixedly mounted on the top surface of the connecting plate, the two support plates 13 are located on one side of the connecting plate, and the two support plates 13 are respectively located at the front and rear ends of the connecting plate; A motor, wherein the motor is fixedly mounted on one side of one of the support plates 13; Two screw rods 14, one end of one of the screw rods 14 is fixedly connected to the end of the output shaft of the motor, and one end of the other screw rod 14 is movably connected to the other support plate 13, and a nut is provided on the screw rod 14 in threaded cooperation; Two vertical rods 15, wherein the vertical rods 15 are located between the two nuts and are fixedly connected to the nuts, and the bottom ends of the vertical rods 15 are in contact with the top surface of the connecting plate; Two placement plates 16, one side of each placement plate 16 is fixedly connected to one side of the vertical rod 15; A transmission member is connected to two screw rods 14 .

[0018] The motor is controlled by the control system. When replacing a new filter element, the connecting plate is pushed upward by the cylinder, and the height of the placement plate 16 is on the same water surface as the bottom end height of the window, that is, the window and the other side of the placement plate are both equipped with infrared sensors. When detecting a signal, the signal is transmitted to the controller, and the controller controls the cylinder to stop extending. At this time, the filter element slides horizontally when it is placed in the filter; the right side of the filter element is placed on the placement plate 16, and the vertical rod 15 contacts the right side surface of the filter element. The motor works, driving the screw rod 14 to rotate. Through the connection of the transmission parts, the two screw rods 14 rotate synchronously, so that the nut moves along the screw rod 14, driving the vertical rod 15 and the placement plate 16 to move toward the filter direction, pushing the filter element into the filter, and the new filter element enters the filter, and the old filter element is ejected, so that it can be replaced at one time, saving time and effort.

[0019] Furthermore, the transmission member described in this embodiment includes two sprockets 17, which are fixedly mounted on one end of the screw 14, and the two sprockets 17 are movably connected by a chain. Through the connection between the sprocket and the chain, the two screws can rotate synchronously, drive the two vertical rods 15 to move synchronously, and control the vertical rods 15 to move toward the filter direction.

[0020] The workflow is as follows: Neutralization reaction: add the reaction material to the reactor, add the neutralizer through the neutralizer addition system, adjust the pH value to the required range, start the agitator and the heating device, and perform the neutralization reaction; Precipitation reaction: add the precipitant through the precipitant addition system to perform the precipitation reaction; after the reaction is completed, stop stirring and let it stand for precipitation; Filtration separation: start the filtration system, pass the reaction liquid through the filter, and separate the precipitate. The filtrate is collected in the filtrate collection tank; Reduction reaction: return the filtrate to the reactor, add the reductant through the reductant addition system, and perform the reduction reaction. After the reaction is completed, adjust the pH value to the required range; Final filtration: start the filtration system again to separate the final product.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chromium-containing wastewater purification treatment device, characterized in that: It comprises a reaction kettle (1), a neutralizing agent adding system (2), a precipitating agent adding system (3), a filtering system (4), a reducing agent adding system (5), a pH regulating system (6), and a control system; The filtering system (4) comprises a filter and a filtrate collecting tank. A pipe is installed at the bottom of the filter, and the pipe is fixedly connected to the top of the filtrate collecting tank. Windows are respectively provided on the inner walls on both sides of the filter. Shielding covers are respectively hingedly installed on the outer walls on both sides of the filter, and the shielding covers can shield the windows. A filtering component is detachably installed in the filter. A support plate (7) is fixedly installed on one side of the filter. A plurality of cylinders (8) are fixedly installed on the top surface of the support plate (7). The top ends of the moving ends of the cylinders (8) are fixedly connected via a connecting plate (9), and a pushing component is installed on the top surface of the connecting plate (9).

2. A chromium-containing wastewater purification treatment device according to claim 1, characterized in that: The filtering component comprises: A filter element (10), wherein the filter element (10) can be inserted into the filter through the window; Two slide grooves, the two slide grooves are respectively opened on the inner walls of the front and rear ends of the filter; A guide groove (11), wherein the guide groove (11) is formed on the inner walls of the front and rear ends of the window, the guide groove (11) is connected to the interior of the slide groove, and one side of the guide groove (11) is connected to the outside; Two guide block groups, each guide block group is composed of two guide blocks (12), the two guide blocks (12) in each guide block group are respectively located on both sides of the filter element (10), the two guide block groups are respectively located at the front and rear ends of the filter element (10), the guide blocks (12) are fixedly connected to the filter element (10), and the guide blocks (12) can be inserted into the guide groove (11) and can slide in the slide groove.

3. A chromium-containing wastewater purification treatment device according to claim 2, characterized in that: The pushing component comprises: Two support plates (13), wherein the two support plates (13) are fixedly mounted on the top surface of the connecting plate, the two support plates (13) are located on one side of the connecting plate, and the two support plates (13) are respectively located at the front and rear ends of the connecting plate; A motor, wherein the motor is fixedly mounted on one side of one of the support plates (13); Two screw rods (14), one end of one of the screw rods (14) is fixedly connected to the end of the output shaft of the motor, one end of the other screw rod (14) is movably connected to the other support plate (13), and a nut is provided on the screw rod (14) in cooperation with the thread; Two vertical rods (15), wherein the vertical rods (15) are located between the two nuts and are fixedly connected to the nuts, and the bottom ends of the vertical rods (15) are in contact with the top surface of the connecting plate; Two placement plates (16), one side of each placement plate (16) being fixedly connected to one side of the vertical rod (15); A transmission member, wherein the transmission member is connected to the two screw rods (14).

4. A chromium-containing wastewater purification treatment device according to claim 3, characterized in that: The transmission member comprises two sprocket wheels (17), the sprocket wheels (17) are fixedly mounted on one end of the screw rod (14), and the two sprocket wheels (17) are movably connected via a chain.

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