Wastewater pretreatment device
By using filter cartridge modules for filtration and precipitation in iron phosphate wastewater treatment, the problems of large equipment footprint and high maintenance costs in the existing technology are solved, efficient wastewater pretreatment is achieved, and the risk of reverse osmosis membrane scaling is reduced.
Patent Information
- Application Number
- CN202421853097.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-08-01
AI Technical Summary
In the existing iron phosphate wastewater treatment, sedimentation tanks and manganese sand filtration devices occupy a large area and require the addition of ammonia, scale inhibitors and other chemicals, resulting in high construction and maintenance costs. The reverse osmosis membrane is prone to scaling, affecting the filtration efficiency and quality.
A wastewater pretreatment device including a filter element module is used. The filter membrane and the curved bottom of the filter element module are used to filter and precipitate particulate matter, reducing the equipment footprint. The filter status is monitored by a pressure sensor to achieve automatic backwashing, reducing maintenance costs.
It effectively filters small particles in iron phosphate wastewater, avoids reverse osmosis membrane scaling, reduces equipment footprint and maintenance costs, improves filtration efficiency and quality, and reduces drug use.
Smart Images
Figure CN223397519U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of iron phosphate wastewater devices, in particular to a wastewater pretreatment device. Background Art
[0002] With the vigorous promotion of new energy vehicles, the market demand for lithium batteries is increasing. Iron phosphate is an important precursor for the preparation of lithium iron phosphate, the cathode material of lithium iron phosphate batteries. Therefore, the lithium battery market has driven the booming iron phosphate market, leading to a gradual increase in demand for iron phosphate.
[0003] However, a large amount of saline wastewater is generated during the production of iron phosphate. According to statistics, about 50 tons of wastewater are generated for every ton of lithium iron phosphate produced. These wastewaters contain a large amount of sulfate, ammonium, sodium, iron and other ions. Conventional wastewater treatment methods usually require the addition of large sedimentation tanks and multi-stage sand filtration equipment, and the addition of ammonia and various reagents at the front end to adjust the pH to reduce turbidity. However, iron phosphate wastewater contains sulfate, ammonium, sodium, iron and other ions. In order to intercept these ions and ensure that the recycled wastewater meets the production standards, a membrane treatment process is usually added. The membrane of the membrane treatment process is a microporous filter material. The basic principle of separation is to intercept the corresponding particles by controlling the size of the micropores. According to the size of the membrane pores, it can be divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Among them, the reverse osmosis membrane is the best for treating saline wastewater.
[0004] Although reverse osmosis membranes are effective in treating saline wastewater, they have a small pore size, and small particles in the wastewater easily scale on the surface of the membrane, thereby reducing filtration efficiency and quality, damaging the membrane structure, and increasing maintenance costs. In order to treat small particles in the wastewater, conventional techniques usually use sedimentation tanks, manganese sand filtration devices, and other devices in the front process of the reverse osmosis system. Although these devices can delay the scaling time of the reverse osmosis membrane to a certain extent, the production line still needs to be shut down for maintenance after running for a long time. In addition, facilities such as sedimentation tanks occupy a large area, and ammonia water, scale inhibitors, flocculants, etc. need to be added to precipitate and remove impurities in the saline wastewater, resulting in high construction and maintenance costs. Utility Model Content
[0005] The purpose of the utility model is to provide a wastewater pretreatment device to solve the technical problems in the prior art of using sedimentation tanks, manganese sand filtration devices and the like before treating ferric phosphate wastewater, which not only occupy a large area but also require the addition of ammonia water, scale inhibitors, flocculants and other chemicals in the later use to help the wastewater precipitate.
[0006] In order to solve the above problems, the technical solution adopted by the utility model is as follows: a wastewater pretreatment device, including a tank body and a water inlet pipe and a clear liquid outlet arranged on the tank body, the tank body is also provided with a filter module that can filter and precipitate particulate matter, the water inlet of the filter module is connected to the water inlet pipe
[0007] The beneficial effects of this embodiment are:
[0008] 1. In the washing and separation section of iron phosphate production, the wastewater generated during the plate-and-frame separation of iron phosphate materials has a high turbidity, often with a turbidity of 40-200. If traditional pretreatment is not performed before membrane treatment, small particles in the wastewater are easily scaled on the surface of the reverse osmosis membrane, thereby reducing the filtration efficiency and quality, and also damaging the membrane structure and increasing maintenance costs. In order to avoid this situation, the prior art uses sedimentation tanks, manganese sand filters and other devices in pretreatment. However, sedimentation tanks, manganese sand filters and other facilities occupy a large area, and it is also necessary to add ammonia, scale inhibitors, flocculants, etc. during use to precipitate and remove impurities from the salt-containing wastewater. The construction and maintenance costs are high. However, the present application is provided with a filter element module, which uses the filter membrane for filtration and the slag discharge arc bottom for precipitation of the filter element module to intercept and precipitate small particles. The one-time investment cost and the subsequent use cost are reduced, and the area occupied is small. No large-scale transformation is required to install the present application.
[0009] Furthermore, the tank body includes an upper cylinder, a main cylinder and a conical bottom, and the upper cylinder and the main cylinder are directly detachably connected, making it convenient to remove the filter element module for maintenance.
[0010] Furthermore, the filter element module includes a filter membrane for filtration and a slag discharge arc bottom for sedimentation, and the filter cavity of the filter membrane is connected to the slag discharge arc bottom.
[0011] Furthermore, the filter element module can be detachably installed in the main cylinder, and the main cylinder is also provided with a backflushing pipe for backflushing the filter element module.
[0012] Furthermore, the filter module is provided with a fixing plate, and a snap-in groove is formed on the inner wall of the main cylinder. The filter module and the main cylinder are fixed together by the fixing plate and the snap-in groove. The snap-in groove and fixing plate connection method ensures easy disassembly and a certain degree of stability, so that the filter module does not float freely in the main cylinder.
[0013] Furthermore, a pressure sensor is provided in the filter cavity of the filter membrane, and a pressure gauge is provided on the outer circumference of the main cylinder. The pressure sensor is electrically connected to the pressure gauge. The pressure gauge displays the pressure in the filter cavity, and the amount of particulate matter attached to the filter screen can be determined by the pressure, thereby determining whether backflushing is to be performed. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the utility model.
[0015] Figure 2 This is a schematic diagram of the filter element module structure in Example 1 of the present utility model.
[0016] Figure 3 This is a diagram showing the connection between the utility model wastewater pretreatment device and each tank body.
[0017] Figure 4 This is a schematic diagram of the structure of the filter element module in Example 2 of the utility model.
[0018] Figure 5 for Figure 4 Schematic diagram of the structure of the filter element module from different perspectives. DETAILED DESCRIPTION
[0019] The following is further described in detail through specific implementation methods:
[0020] The figure marks in the drawings of the specification include: main cylinder 1, water inlet pipe 11, water inlet valve 111, return water valve 112, backwash pipe 12, backwash water valve 121, support plate 13, pressure gauge 14, upper cylinder 2, reuse clean water valve 21, clean liquid outlet 22, conical bottom 3, slag discharge valve 31, filter element module 4, fixing plate 41, filter membrane 42, water inlet 43, slag discharge port 44.
[0021] In the description of the following Examples 1 and 2, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction; the term "connection" only indicates the connection between devices and does not have any special meaning.
[0022] Example 1
[0023] As attached Figures 1-2 The figure shows a wastewater pretreatment device, which is lined with polytetrafluoroethylene material as a whole. The main body of the device is a cylindrical tank body, which includes an upper cylinder body 2, a main cylinder body 1, and a conical bottom 3. The conical bottom 3 is welded to the main cylinder body 1, and a slag discharge valve 31 is provided at the bottom of the conical bottom 3.
[0024] The main cylinder 1 is a cylindrical structure, and a support plate 13 is welded on the circumference of the upper end of the barrel. The support plate 13 is fixed to the basic steel frame structure when the wastewater pretreatment device is installed, which is convenient for installation.
[0025] by Figure 1The direction is a description direction. An inlet pipe 11 is provided on the lower side of the right end of the main cylinder 1. A T-shaped pipe is formed on the inlet pipe 11 using a tee. An inlet valve 111 is provided on the straight pipe part of the T-shaped pipe, and a return water valve 112 is provided on the vertical pipe part. Therefore, when the inlet valve 111 is opened and the return water valve 112 is closed, the iron phosphate wastewater can enter the wastewater pretreatment device through the inlet pipe 11. However, when the wastewater pretreatment device needs maintenance, the inlet valve 111 can also be closed and the return water valve 112 can be opened, so that when the sewage flows into the wastewater pretreatment device of the present application, it directly flows back to the buffer tank and does not enter the wastewater pretreatment device of the present application, freeing up time and space for maintenance of the wastewater pretreatment device.
[0026] A backflush pipe 12 is provided on the right side of the main cylinder 1 , which is connected to the inner space of the main cylinder 1 . A backflush water valve 121 is also provided on the backflush pipe 12 , so that the backflush time and the backflush time interval can be controlled by the backflush water valve 121 .
[0027] The main cylinder 1 is a barrel-shaped structure with a cylindrical cavity inside. A filter element module 4 is installed in the cavity. The filter element module 4 is as shown in FIG. Figure 2 As shown, the upper half of the main body is a filter body integrated with multiple filter membranes 42, and the lower half is a slag discharge arc bottom. The filter membrane 42 is a closed structure composed of a metal frame and a copper wire filter plate. This closed structure forms a filter cavity in the middle of the filter membrane 42, and in order to connect the filter cavity of each filter membrane, a wastewater circulation channel is set at the center of the filter membrane 42. The wastewater circulation channel is also connected to the water inlet 43 of the filter element module 4. Therefore, the salt-containing wastewater produced by the production of iron phosphate can reach the filter cavity of any filter membrane 42 through the water inlet 43 and be filtered through the copper wire filter plate on the filter membrane 42.
[0028] The filter cavity of the filter membrane 42 is also connected to the curved bottom of the slag discharge. The curved bottom is made of stainless steel, which is watertight and sediment-proof. Therefore, fixed particulate matter in the wastewater can be directly deposited into the curved bottom of the slag discharge. A slag discharge port 44 is also provided at the bottom of the slag discharge curved bottom to discharge particulate matter settled in the slag discharge curved bottom out of the filter element module 4. A pressure sensor is also installed in the filter cavity of the filter membrane 42, and the pressure sensor transmits the data to the pressure gauge 14 on the right side of the main cylinder 1. A fixing plate 41 is welded to the outside of the filter element module 4.
[0029] When installing the filter element module 4, place the filter element module 4 into the main cylinder body 1 so that the fixing plate 41 on the filter element module 4 is clamped and fixed with the inner wall of the main cylinder body 1, including but not limited to opening a clamping groove on the inner wall of the main cylinder body 1. After the fixing is completed, the water inlet 43 is connected to the water inlet pipe 11 on the main cylinder body, and the interface position is sealed with a rubber gasket and a nut to ensure that the salt-containing wastewater will pass through the water inlet pipe 11 through the water inlet 43 into the filter cavity of the filter membrane 42 without leaking. At the same time, the slag discharge port 44 of the slag discharge arc bottom is connected to the slag discharge valve 31 of the conical bottom 3, and the interface position is also sealed with a rubber gasket and a nut. An upper cylinder body 2 is provided above the main cylinder body 1. The upper cylinder body 2 and the main cylinder body 1 are detachable structures. When in use, the upper cylinder body 2 and the main cylinder body 1 need to be connected as a whole, and the connection must be sealed to ensure that the connection is leak-proof, including but not limited to the use of sealing gaskets and bolts for sealing connection. Figure 1 The direction is a description direction. A recycling pipe is set on the right side of the upper cylinder 2 to reuse the clean water reaching the upper cylinder. A recycling clean water valve 21 is provided on the recycling pipe to control the amount and time of recycled clean water. A clear liquid outlet 22 is set on the left side of the upper cylinder 2. The main function of the clear liquid outlet 22 is to allow the filtered wastewater to overflow out of the wastewater pretreatment device of this application.
[0030] Example 2
[0031] like Figure 1 、 Figure 4 and Figure 5 As shown, the difference between Example 2 and Example 1 is that the structure of the filter element module 4 is different. The structure of the filter element module 4 in Example 2 is as follows. Figure 4 、 Figure 5 As shown, the filter element module 4 is composed of multiple filter membranes 42, and the two ends of the filter membrane 42 are fixed as a whole by two fixed discs 411. The filter membrane 42 is a woven tube structure, and a water inlet 43 is opened on the fixed disc 411 at the lower end. The water inlet 43 is connected to the inside of the filter membrane 42, and the fixed disc 411 at the upper end closes the upper end pipe mouth of the filter membrane, so that the wastewater entering the filter membrane 42 through the water inlet 43 can only come out of the filter membrane 42 through the filter mesh on the filter 42.
[0032] During installation, place several filter cartridge modules 4 in Example 2 as shown in FIG. Figure 5As shown, it is stood up and fixed into an integral structure with cross bars, and placed in the main cylinder 1. It is fixed to the inner wall of the main cylinder 1 by cross bars as in Example 1, but the difference is that the conical bottom 3 and the main cylinder 1 in Example 2 are closed by a partition plate, so that the wastewater entering the conical bottom 3 cannot directly enter the main cylinder 1, and a plurality of mounting holes that can be installed with the fixed disc 411 are provided on the partition plate. The fixed disc 411 with the water inlet 43 is installed on the partition plate using the mounting holes. After installation, it is necessary to include but not limited to sealing with sealing gaskets and bolts to prevent water from leaking at the interface. Therefore, the wastewater in the conical bottom 3 can enter the filter membrane 42 through the water inlet 43 on the fixed disc 411.
[0033] The water inlet pipe 11 in Example 2 is connected to the conical bottom 3, so when the wastewater enters the conical bottom 3 through the water inlet pipe 11, it accumulates. As the amount of wastewater increases, the wastewater enters the filter membrane 42 through the water inlet 43 of the fixed disc 411 on the partition plate, passes through the screen on the filter membrane 42 and enters the main cylinder 1. The particulate matter in the wastewater is filtered out, and the particulate matter suspended in the filter membrane 42 will also settle to the conical bottom 3 under the action of gravity and be discharged directly from the slag discharge valve 31.
[0034] The connection relationship between the wastewater pretreatment device and each wastewater treatment tank in Examples 1 and 2 of the present application is as follows Figure 3 As shown, when in use, the wastewater produced by the production of iron phosphate will be discharged into the buffer tank as wastewater to be filtered, and the wastewater to be filtered is transported to the water inlet pipe 11 of the wastewater pretreatment device by the liquid inlet pump, and enters the filter cavity of the filter membrane 42 of the filter element module 4 through the water inlet pipe 11. In the filter cavity of the filter membrane 42, part of the particles are directly settled to the 4 slag arc bottom of the filter element module by gravity, and Example 2 settles to the conical bottom. Some small particles suspended in the wastewater are also trapped in the filter cavity of the filter membrane 42 when the wastewater passes through the copper wire filter of the filter membrane 42. As the small particle suspension in the filter cavity increases, it will also settle to the 4 slag arc bottom of the filter element module after agglomeration (Example 2 settles to the conical bottom). The wastewater passing through the copper wire filter plate enters the internal cavity of the main cylinder 1 for accumulation. When the accumulated filtered clean water accumulates in the upper cylinder 2, the filtered clean water will overflow the wastewater pretreatment device and flow into the clean water tank.
[0035] When the sediment deposited in the bottom of the slag discharge arc reaches a certain amount, the sediment at the bottom can be discharged into the mud pool by opening the slag discharge valve 31. When the pressure in the filter cavity of the filter membrane 42 is too high, it means that there are too many particles attached to the copper wire filter plate. At this time, the backwash water valve 121 on the backwash pipe 12 is opened, and the copper wire filter plate is backwashed with the refluxed clear liquid, so that the particles attached to the copper wire filter plate are re-suspended in the filter cavity and slowly precipitated to the bottom of the slag discharge arc. During backwashing, it is necessary to close the clear liquid outlet 22 of the upper cylinder 2, open the reused clean water valve 21, and use the reused clean water to backwash the copper wire filter plate. The wastewater pretreatment device of the present application is also equipped with an integrated controller, which is electrically connected to all valves on the wastewater pretreatment device of the present application, and all valves on the present application are solenoid valves, which can be controlled to open and close by the integrated controller.
[0036] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A wastewater pretreatment device, comprising a tank body, a water inlet pipe and a clear liquid outlet provided on the tank body, characterized in that: The tank body is also provided with a filter element module that can filter and precipitate particulate matter, and the water inlet of the filter element module is connected to the water inlet pipe; the tank body includes an upper cylinder, a main cylinder and a conical bottom, and the upper cylinder is directly detachably connected to the main cylinder; the filter element module includes a filter membrane for filtration and a slag discharge arc bottom for precipitation, and the filter cavity of the filter membrane is connected to the slag discharge arc bottom; the filter element module is detachably installed in the main cylinder body, and the main cylinder body is also provided with a backwash pipe that can backwash the filter element module; the filter element module is provided with a fixing plate, and a clamping groove is opened on the inner wall of the main cylinder, and the filter element module and the main cylinder body are clamped and fixed by the fixing plate and the clamping groove; the filter element module is composed of filter membranes of several tubular structures, and fixing discs for fixing the filter membranes are provided at both ends of the filter membrane.
2. The wastewater pretreatment device according to claim 1, characterized in that: A pressure sensor is provided in the filter cavity of the filter membrane, a pressure gauge is provided on the outer peripheral surface of the main cylinder, and the pressure sensor is electrically connected to the pressure gauge.