Oily wastewater treatment device

Abstract

The utility model relates to an oily wastewater treatment device, which relates to the technical field of wastewater treatment and comprises a first treatment pond, a second treatment pond and a collection box which are sequentially arranged, an oil separation mechanism is arranged in the first treatment pond, a filter membrane cylinder is arranged in the second treatment pond, and the collection box is connected with the filter membrane cylinder through a water delivery pipe. And an air injection assembly for reducing blockage of the filter membrane cylinder is arranged in the second treatment tank. Oil-containing wastewater firstly enters the first treatment tank, the oil separation mechanism removes floating oil and dispersed oil in the wastewater, the oil-containing wastewater enters the second treatment tank, oil-water separation is performed through the filter membrane cylinder, the air injection assembly is started to inject air, and air flow drives the filter membrane cylinder to vibrate, so that oil substances attached to the surface of the filter membrane cylinder fall off; meanwhile, bubbles generated by the airflow in the wastewater drive oil substances to rise and float to the surface of the wastewater, so that the probability that the surface of the filter membrane cylinder is blocked by the oil substances is reduced, the separation effect of the filter membrane cylinder is improved, and the treatment efficiency of the oily wastewater is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating oily wastewater. Background Art

[0002] Oily wastewater mainly comes from wastewater containing oily substances generated during industrial production. The oily substances contained in oily wastewater include natural petroleum, petroleum products, tar and its fractions, as well as edible animal and vegetable oils and fats. In terms of water pollution, it is mainly petroleum and tar. These oily substances usually exist in three states in wastewater. The first type is floating oil and dispersed oil, the second type is emulsified oil, and the third type is dissolved oil. Direct discharge of oily wastewater will cause pollution to soil, plants and water bodies. Therefore, oily wastewater needs to be treated to meet emission standards.

[0003] The treatment methods for oily wastewater generally use filtration, flotation and flocculation. Floating oil and dispersed oil are generally easier to treat. Since floating oil and dispersed oil have a lower density than water, they will accumulate on the surface of the wastewater. Emulsified oil contains surfactants and organic matter that plays the same role. The oil exists in the form of particles on the order of microns. Dissolved oil is dissolved in water in a molecular state, and the oil droplets are small in size. Therefore, the treatment method for oily wastewater is usually to filter the wastewater first to remove suspended matter and large particle impurities contained in the wastewater, and then choose one or more methods of dosing coagulation, metal electrolysis, active adsorption or membrane separation to treat the filtered wastewater.

[0004] Since membrane separation treatment can reasonably determine the membrane retention molecular weight according to the size of oil particles in the wastewater, and there is generally no phase change during the treatment process, oil-water separation can generally be achieved directly without going through the demulsification process. In addition, no oily sludge is produced during the membrane separation of oil and water, and the concentrate can be incinerated. The flow rate and water quality are relatively stable and do not change with the fluctuation of oil concentration in the influent water. Generally, it only needs to be operated at room temperature, so it is widely used. However, the surface of the membrane is easily clogged by the isolated oil droplets, thereby reducing the treatment efficiency of oily wastewater. Utility Model Content

[0005] In order to improve the treatment efficiency of oily wastewater, the utility model provides an oily wastewater treatment device.

[0006] This application provides an oily wastewater treatment device, which adopts the following technical solution:

[0007] An oily wastewater treatment device comprises a first treatment tank, a second treatment tank and a collection box arranged in sequence, wherein the first treatment tank is provided with an oil separation mechanism for treating floating oil and dispersed oil, the second treatment tank is connected to the first treatment tank via a delivery pipe, a filter membrane cartridge is provided in the second treatment tank, the collection box is connected to the filter membrane cartridge via a water delivery pipe, and the second treatment tank is provided with an injection assembly for reducing clogging of the filter membrane cartridge.

[0008] By adopting the above technical solution, the oily wastewater first enters the first treatment tank, and the oil separation mechanism removes the floating oil and dispersed oil in the wastewater. The oily wastewater that has undergone preliminary treatment enters the second treatment tank, and is separated from oil and water by the filter membrane cartridge. The treated water is collected in the collection box through the water pipe, while the oily substances remain in the second treatment tank. The jet component is started to jet the second treatment tank, and the airflow drives the filter membrane cartridge to vibrate, thereby causing the oily substances attached to the surface of the filter membrane cartridge to fall off. At the same time, the bubbles generated by the airflow in the wastewater drive the oily substances to rise and float to the surface of the wastewater, thereby reducing the probability of the filter membrane cartridge surface being blocked by oily substances, improving the separation effect of the filter membrane cartridge, and thus improving the treatment efficiency of the oily wastewater.

[0009] Optionally, there are multiple filter membrane cartridges, and the multiple filter membrane cartridges are spaced apart in the second treatment tank and extend vertically. The bottom end of the filter membrane cartridge has a closed cover, and the top ends of the multiple filter membrane cartridges are connected through a water outlet pipe. The end of the water outlet pipe away from the second treatment tank is connected to a water supply pipe, and a water supply pipe is provided on the water supply pipe.

[0010] By adopting the above technical solution, the oily wastewater is separated through multiple filter membrane cartridges, and the oily substances remain in the second treatment tank. After passing through the filter membrane cartridges, the water is gathered through the outlet pipe and transported to the collection box through the water pipe under the action of the water pump for collection. Multiple filter membrane cartridges are immersed in separation to improve the treatment efficiency of oily wastewater.

[0011] Optionally, the jet assembly includes:

[0012] An air pump, wherein the outlet end of the air pump is connected to a main air pipe;

[0013] An air delivery pipe, wherein the air delivery pipe is provided in plurality and is arranged at intervals on the main air pipe and is connected to the main air pipe, and one end of the air delivery pipe away from the main air pipe extends between two adjacent filter membrane cylinders;

[0014] The air jet pipe is arranged at one end of the air delivery pipe away from the main air pipe, and the top of the air jet pipe is provided with two nozzles, and the two nozzles are respectively directed towards the side walls of two adjacent filter membrane cylinders.

[0015] By adopting the above technical solution, the air pump is started, and the air flow passes through the air pipe and the air injection pipe and is ejected from the nozzle, and the nozzle is directed toward the side wall of the filter membrane cartridge. As a result, the air flow drives the filter membrane cartridge to vibrate, thereby causing the oil substances attached to the surface of the filter membrane cartridge to fall off. At the same time, the bubbles generated by the air flow in the wastewater drive the oil substances to rise and float to the surface of the wastewater, thereby reducing the probability of the filter membrane cartridge surface being blocked by oil substances, improving the separation effect of the filter membrane cartridge, and thus improving the treatment efficiency of oily wastewater.

[0016] Optionally, a backflush pipe is provided on the collection box, a backflush pump is provided on the backflush pipe, the backflush pipe is connected to the connection between the water supply pipe and the outlet pipe, and a first three-way valve is provided at the connection between the backflush pipe, the water supply pipe and the outlet pipe. When water is discharged, the first three-way valve controls the connection between the outlet pipe and the water supply pipe, and when backflushing, the first three-way valve controls the connection between the outlet pipe and the backflush pipe.

[0017] By adopting the above technical solution, when water is discharged, the first three-way valve controls the water outlet pipe and the water supply pipe to be connected, the water supply pump is started, and the separated water passes through the water outlet pipe and the water supply pipe and enters the collection box for collection. When backflushing is required, the water supply pump is closed, the first three-way valve controls the backflush pipe to be connected with the water outlet pipe, the backflush pump is started, and the water in the collection box passes through the backflush pipe and the water outlet pipe to backflush the filter membrane cartridge. In conjunction with the function of the jet pipe, the probability of the filter membrane cartridge surface being blocked by oil substances is reduced, the separation effect of the filter membrane cartridge is improved, and thus the treatment efficiency of oily wastewater is improved.

[0018] Optionally, a horizontally extending mounting plate is provided in the second treatment tank, a mounting ring is provided at the front end of the mounting plate, the filter membrane cartridge is vertically inserted into the mounting ring, and a positioning component for positioning the filter membrane cartridge is provided on the mounting ring.

[0019] By adopting the above technical solution, the filter membrane cartridge is inserted into the installation ring during installation, and the positioning assembly positions the filter membrane cartridge so that the filter membrane cartridge always remains in a vertical state, thereby improving the working stability of the filter membrane cartridge.

[0020] Optionally, the positioning component includes:

[0021] A positioning block, the positioning block being provided on the filter membrane cartridge and abutting against the mounting ring;

[0022] A positioning rod passes through the positioning block and is threadedly connected to the mounting ring.

[0023] By adopting the above technical solution, the filter membrane cartridge is pushed so that the positioning block contacts the installation ring, and the positioning rod is rotated to position the positioning block, thereby realizing the installation and positioning of the filter membrane cartridge.

[0024] Optionally, the oil separation mechanism includes:

[0025] A partition is provided in the first treatment tank, the partition dividing the first treatment tank into a first chamber and a second chamber, the partition having a water port communicating with the first chamber and the second chamber, an oil retaining column provided on the partition, the bottom end of the oil retaining column being open, the oil retaining column being in communication with the water port, and the delivery pipe being in communication with the second chamber;

[0026] a first baffle, the first baffle being vertically arranged in the first chamber, and a first water-passing space being defined between a bottom end of the first baffle and a bottom end of the first treatment tank;

[0027] A second baffle, the second baffle being vertically arranged in the second chamber, with a second water-passing space being defined between the bottom end of the second baffle and the bottom end of the first treatment tank;

[0028] a water outlet baffle, the water outlet baffle being vertically arranged in the second chamber and being located between the second water baffle and the delivery pipe, with a water outlet space being defined between the water outlet baffle and the bottom end of the second chamber;

[0029] The filter element is arranged in the first chamber and is located between the inner wall of the first treatment tank and the first water baffle and above the first water flow space.

[0030] By adopting the above technical solution, the oily wastewater enters the first chamber, the filter element filters floating matter and large particles of impurities, and the filtered oily wastewater settles in the first water flow space, the sediment accumulates on the bottom wall of the first chamber, and some floating oil and dispersed oil float on the surface of the wastewater in the first chamber. As the water volume increases, the oily wastewater enters the second chamber through the water flow port. During this process, the oil blocking column blocks the oil substances in the first chamber and cooperates with the partition to block the sediment in the first chamber, thereby reducing the amount of oil substances and sediment entering the second chamber. The oily wastewater settles again in the second chamber, and the sediment accumulates on the bottom wall of the second chamber. Some floating oil and dispersed oil float on the surface of the wastewater in the second chamber. The separated water passes through the second water flow space and the third water flow space and is transported from the delivery pipe to the second treatment tank, thereby achieving pretreatment of the oily wastewater, separating floating matter, large particles of impurities, sediment, floating oil and dispersed oil, reducing impurities entering the second treatment tank, and thus improving the treatment efficiency of the oily wastewater.

[0031] Optionally, the filter element includes a first filter basket and a second filter basket, the first filter basket is hung in the first chamber through a mounting plate, and the second filter basket is arranged below the first filter basket.

[0032] By adopting the above technical solution, the first filter basket and the second filter basket perform double filtration on the oily wastewater, thereby improving the filtering effect.

[0033] Optionally, it also includes a cleaning box, which contains cleaning liquid. The cleaning box is provided with a first cleaning pipe and a second cleaning pipe. The first cleaning pipe extends into the second treatment tank and is provided with a cleaning pump. The second cleaning pipe is connected to the backflush pipe. A second three-way valve is provided at the connection between the second cleaning pipe and the backflush pipe.

[0034] By adopting the above technical solution, when the second treatment tank needs to be cleaned, the cleaning pump is started and the cleaning liquid is transported to the second treatment tank for cleaning. When the filter membrane cartridge needs to be cleaned, the second three-way valve controls the connection between the cleaning pipe and the backflush pipe, and at the same time, the first three-way valve controls the connection between the backflush pipe and the outlet pipe. Under the action of the backflush pump, the cleaning liquid passes through the second cleaning pipe, the backflush pipe and the outlet pipe and then enters the filter membrane cartridge to clean the filter membrane cartridge, thereby improving the convenience of cleaning and thus the treatment efficiency of oily wastewater.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. The oily wastewater first enters the first treatment tank, and the oil separation mechanism removes the floating oil and dispersed oil in the wastewater. The oily wastewater that has undergone preliminary treatment enters the second treatment tank, where it is separated into oil and water by the filter membrane cartridge. The treated water is collected in the collection box through the water pipe, while the oily substances remain in the second treatment tank. The jet assembly is started to spray the second treatment tank, and the airflow drives the filter membrane cartridge to vibrate, thereby causing the oily substances attached to the surface of the filter membrane cartridge to fall off. At the same time, the bubbles generated by the airflow in the wastewater drive the oily substances to rise and float to the surface of the wastewater, thereby reducing the probability of the filter membrane cartridge surface being blocked by oily substances, improving the separation effect of the filter membrane cartridge, and thus improving the treatment efficiency of the oily wastewater.

[0037] 2. When the oily wastewater enters the first chamber, the filter element filters floating objects and large particles of impurities. The filtered oily wastewater settles in the first water passage space, and the sediment accumulates on the bottom wall of the first chamber. Some floating oil and dispersed oil float on the surface of the wastewater in the first chamber. As the water volume increases, the oily wastewater enters the second chamber through the water opening. During this process, the oil-blocking column blocks the oil substances in the first chamber, and cooperates with the partition to block the sediment in the first chamber, thereby reducing the amount of oil substances and sediment entering the second chamber. The oily wastewater settles again in the second chamber, and the sediment accumulates on the bottom wall of the second chamber. Some floating oil and dispersed oil float on the surface of the wastewater in the second chamber. The separated water passes through the second water passage space and the third water passage space and is transported from the delivery pipe to the second treatment tank, thereby achieving pretreatment of the oily wastewater, separating floating objects, large particles of impurities, sediment, floating oil and dispersed oil, reducing the impurities entering the second treatment tank, and thus improving the treatment efficiency of the oily wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1It is a schematic diagram of the overall structure of this application;

[0039] Figure 2 is a cross-sectional view of the first treatment tank in this application;

[0040] Figure 3 It is a structural diagram of the filter element in this application;

[0041] Figure 4 is a schematic structural diagram of the jet assembly in the present application, wherein the second treatment tank is partially cut away;

[0042] Figure 5 is an exploded view of the positioning components in this application;

[0043] Figure 6 It is a schematic diagram of the connection between the cleaning box and the second treatment tank in this application, in which the second treatment tank is partially cut away.

[0044] Reference numerals: 1, first treatment tank; 11, first chamber; 111, first oil outlet; 12, second chamber; 121, second oil outlet; 2, second treatment tank; 21, delivery pipe; 22, mounting plate; 221, mounting ring; 23, positioning assembly; 231, positioning block; 232, positioning rod; 24, drain pipe; 3, collection box; 31, water delivery pipe; 311, water delivery pump; 32, backflush pipe; 321, backflush pump; 33, first three-way valve; 4, cleaning box; 41, first cleaning pipe; 411, cleaning pump; 42, second cleaning pipe; 43, second three-way valve; 5, oil distribution mechanism; 51. Partition; 511. Water outlet; 512. Oil retaining column; 52. First water baffle; 521. First water passage space; 53. Second water baffle; 531. Second water passage space; 54. Water outlet baffle; 541. Water outlet space; 55. Filter element; 551. First filter basket; 552. Second filter basket; 553. First filter hole; 554. Second filter hole; 56. Mounting plate; 561. Mounting part; 6. Filter membrane cylinder; 61. Closing cover; 62. Mounting cover; 63. Water outlet pipe; 7. Jet assembly; 71. Air pump; 711. Main air pipe; 72. Air supply pipe; 73. Jet pipe. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-6 This application is described in further detail.

[0046] The embodiment of the present application discloses an oily wastewater treatment device.

[0047] Reference Figure 1 and Figure 2A device for treating oily wastewater comprises a first treatment tank 1, a second treatment tank 2 and a collecting box 3 arranged in sequence. The first treatment tank 1 is provided with an oil separation mechanism 5 for treating floating oil and dispersed oil. The second treatment tank 2 is connected to the first treatment tank 1 through a delivery pipe 21. A filter membrane cartridge 6 is provided in the second treatment tank 2. The collecting box 3 is connected to the filter membrane cartridge 6 through a water delivery pipe 31. The second treatment tank 2 is provided with an injection assembly 7 for reducing blockage of the filter membrane cartridge 6.

[0048] Reference Figure 1 and Figure 2 The first treatment tank 1 has a water inlet pipe at one end away from the delivery pipe 21, and the oil separation mechanism 5 includes a partition 51, a first water baffle 52, a second water baffle 53, a water outlet baffle 54 and a filter element 55. The partition 51 is fixed in the first treatment tank 1. The partition 51 divides the first treatment tank 1 into a first chamber 11 and a second chamber 12. The middle part of the partition 51 has a water port 511 connecting the first chamber 11 and the second chamber 12. The water port 511 extends horizontally. An oil retaining column 512 is also provided on the partition 51. The bottom end of the oil retaining column 512 is in an open state and there is a gap for water flow between it and the bottom wall of the first chamber 11. The oil retaining column 512 is connected to the water port 511, and the delivery pipe 21 is connected to the second chamber 12.

[0049] Reference Figure 1 and Figure 2 The first water baffle 52 is vertically fixed in the first chamber 11. There is a first water space 521 between the bottom end of the first water baffle 52 and the bottom end of the first treatment tank 1. The bottom end of the first water baffle 52 is located above the bottom end of the oil baffle column 512. There is a first oil outlet 111 in the first chamber 11. The first oil outlet 111 is located between the first water baffle 52 and the baffle and above the oil baffle column 512.

[0050] Reference Figure 1 and Figure 2 The second water-blocking plate 53 is vertically fixed in the second chamber 12, and there is a second water-passing space 531 between the bottom end of the second water-blocking plate 53 and the bottom end of the first treatment tank 1. The first water-passing space 521 and the second water-passing space 531 are respectively located on both sides of the partition 51. The water outlet baffle 54 is vertically fixed in the second chamber 12 and is located between the second water-blocking plate 53 and the delivery pipe 21. There is a water outlet space 541 between the water outlet baffle 54 and the bottom wall of the second chamber 12, and the height of the water outlet space 541 is less than the height of the second water-passing space 531. There are two second oil outlets 121 in the second chamber 12. The two second oil outlets 121 in the second chamber 12 are respectively located between the baffle and the second water-blocking plate 53 and the second water-blocking plate 53 and the water outlet baffle 54 and are flush with the height of the first oil outlet 111.

[0051] Reference Figure 2 and Figure 3The filter element 55 is arranged in the first chamber 11 and is located between the inner wall of the first treatment tank 1 and the first water baffle 52 and above the first water flow space 521. The filter element 55 includes a first filter basket 551 and a second filter basket 552. The tops of the first filter basket 551 and the second filter basket 552 are both open. A plurality of first filter holes 553 are evenly distributed on the first filter basket 551, and the first filter basket 551 is hung in the first chamber 11 through a mounting plate 56.

[0052] Reference Figure 2 and Figure 3 There are two mounting plates 56 and they are respectively fixed on the opposite sides of the first filter basket 551. The two mounting plates 56 extend vertically upward. The top of the mounting plate 56 has a horizontally extending mounting portion 561. The mounting portion 561 is mounted on the top of the first chamber 11. The second filter basket 552 is fixed below the first filter basket 551, and the bottom end of the second filter basket 552 is located above the first water barrier. A plurality of second filter holes 554 are evenly distributed on the second filter basket 552, and the aperture of the first filter hole 553 is larger than the aperture of the second filter hole 554.

[0053] Reference Figure 1 and Figure 2 The oily wastewater enters the first chamber 11, and the first filter basket 551 and the second filter basket 552 filter floating objects and large particles of impurities. The filtered oily wastewater settles in the first water space 521, and the sediment accumulates on the bottom wall of the first chamber 11. Some floating oil and dispersed oil float on the surface of the wastewater in the first chamber 11. As the water volume increases, the oily wastewater enters the second chamber 12 through the water port 511. During this process, the oil blocking column 512 blocks the oil substances in the first chamber 11, and cooperates with the partition 51 to block the sediment in the first chamber 11, thereby reducing the amount of oil substances and sediment entering the second chamber 12.

[0054] Reference Figure 1 and Figure 2 The oily wastewater is precipitated again in the second chamber 12, and the sediment accumulates on the bottom wall of the second chamber 12. Some floating oil and dispersed oil float on the surface of the wastewater in the second chamber 12. Finally, the oil substances on the wastewater are discharged through the first oil outlet 111 and the second oil outlet 121. The separated water passes through the second water space 531 and the third water space and is transported from the delivery pipe 21 to the second treatment tank 2, thereby realizing the pretreatment of the oily wastewater, separating floating objects, large particles of impurities, sediments, floating oil and dispersed oil, and reducing the impurities entering the second treatment tank 2.

[0055] The bottom ends of the first chamber 11 and the second chamber 12 are both provided with mud outlets (not shown in the figures) for discharging sediment.

[0056] Reference Figure 1 and Figure 4 , there are multiple filter membrane cartridges 6, and multiple filter membrane cartridges 6 are arranged at intervals in the second treatment tank 2 and extend vertically. In this embodiment, three filter membrane cartridges 6 are set as an example for explanation. The filter membrane cartridge 6 can be made of any filter membrane with a separation function in the existing technology. The bottom end of the filter membrane cartridge 6 has a closing cover 61, and the top end of the filter membrane cartridge 6 has a mounting cover 62. The interior of the mounting cover 62 is hollow, and the mounting cover 62 has a pipe for water outlet. Multiple pipes are connected through a water outlet pipe 63. The end of the water outlet pipe 63 away from the second treatment tank 2 is connected to the water supply pipe 31, and the water supply pipe 31 is provided with a water supply pump 311.

[0057] Reference Figure 4 and Figure 5 A horizontally extending mounting plate 22 is provided in the second treatment tank 2. There are multiple mounting plates 22 and they correspond one-to-one to the filter membrane cartridges 6. The mounting plate 22 is fixed on the inner wall of the second treatment tank 2. A mounting ring 221 is provided at the front end of the mounting plate 22. The filter membrane cartridge 6 is vertically inserted into the mounting ring 221. A positioning component 23 for positioning the filter membrane cartridge 6 is provided on the mounting ring 221.

[0058] Reference Figure 4 and Figure 5 The positioning assembly 23 includes a positioning block 231 and a positioning rod 232. There are two positioning blocks 231. The two positioning blocks 231 are fixed on the outer surface of the mounting cover 62 at intervals and abut against the mounting ring 221. There are two positioning rods 232 and they correspond one to one with the positioning blocks 231. The positioning rods 232 vertically pass through the positioning blocks 231 and are threadedly connected to the mounting ring 221.

[0059] Reference Figure 1 and Figure 4 The jet assembly 7 includes an air pump 71, an air pipe 72 and an air jet pipe 73. The outlet end of the air pump 71 is connected to the main air pipe 711, which extends horizontally along the length direction of the second treatment tank 2. There are multiple air pipes 72, and multiple air pipes 72 are arranged at intervals on the main air pipe 711 and connected to the main air pipe 711. One end of the air pipe 72 away from the main air pipe 711 extends between two adjacent filter membrane cylinders 6. The horizontal projection of the air jet pipe 73 is Y-shaped. The air jet pipe 73 is fixed to one end of the air pipe 72 away from the main air pipe 711, and the top of the air jet pipe 73 has two nozzles (not shown in the figure), and the two nozzles are respectively directed towards the side walls of the two adjacent filter membrane cylinders 6.

[0060] Reference Figure 1 、 Figure 4 and Figure 6A backwash pipe 32 is provided on the collection box 3, and a backwash pump 321 is provided on the backwash pipe 32. The backwash pipe 32 is connected to the connection between the water supply pipe 31 and the water outlet pipe 63, and a first three-way valve 33 is provided at the connection between the backwash pipe 32, the water supply pipe 31 and the water outlet pipe 63. When water is discharged, the first three-way valve 33 controls the connection between the water outlet pipe 63 and the water supply pipe 31. When backflushing, the first three-way valve 33 controls the connection between the water outlet pipe 63 and the backwash pipe 32.

[0061] Reference Figure 1 、 Figure 4 and Figure 6 The oily wastewater treatment device also includes a cleaning box 4, which contains cleaning liquid. The cleaning box 4 is provided with a first cleaning pipe 41 and a second cleaning pipe 42. The first cleaning pipe 41 and the second cleaning pipe 42 are both connected to the cleaning box 4. The first cleaning pipe 41 extends into the second treatment tank 2, and the first cleaning pipe 41 is provided with a cleaning pump 411. The second cleaning pipe 42 is connected to the backflush pipe 32, and a second three-way valve 43 is provided at the connection between the second cleaning pipe 42 and the backflush pipe 32.

[0062] Reference Figure 1 The bottom of the second treatment tank 2 is provided with a drain pipe 24 for discharging the concentrated liquid, and the drain pipe 24 is provided with a drain valve (not shown in the figure) for controlling the opening and closing.

[0063] Reference Figure 1 、 Figure 2 and Figure 6 After pre-treatment in the first treatment tank 1, the oily wastewater enters the second treatment tank 2. Multiple filter membrane cartridges 6 separate the oily wastewater, and oil substances remain in the second treatment tank 2. The water is collected in the outlet pipe 63 through the pipeline. The first three-way valve 33 is adjusted to connect the outlet pipe 63 with the water supply pipe 31, and the water supply pump 311 is started. The separated water passes through the outlet pipe 63 and the water supply pipe 31 and is collected in the collection box 3. When backflushing is required, the water supply pump 311 is turned off, the first three-way valve 33 is adjusted to connect the backflush pipe 32 with the outlet pipe 63, and the second three-way valve 43 is adjusted to keep the backflush pipe 32 in a flowing state. The backflush pump 321 is started to reverse the separated water in the collection box 3 through the backflush pipe 32 and the outlet pipe 63 and enter the filter membrane cartridge 6 for backflush.

[0064] Reference Figure 1 、 Figure 4 and Figure 6 During this process, the air pump 71 can be started at any time, and the air flow passes through the main air pipe 711, the air supply pipe 72 and the air injection pipe 73 and is ejected from the nozzle. The nozzle is directed toward the side wall of the filter membrane cylinder 6, so that the air flow drives the filter membrane cylinder 6 to vibrate, thereby causing the oil substances attached to the surface of the filter membrane cylinder 6 to fall off. At the same time, the bubbles generated by the air flow in the wastewater drive the oil substances to rise and float to the surface of the wastewater, thereby reducing the probability of the surface of the filter membrane cylinder 6 being blocked by oil substances, improving the separation effect of the filter membrane cylinder 6, and thus improving the treatment efficiency of oily wastewater.

[0065] Reference Figure 1 、 Figure 4 and Figure 6 The oil concentrate in the second treatment tank 2 can be discharged through the drain pipe 24. When the second treatment tank 2 needs to be cleaned, the cleaning pump 411 is started, and the cleaning liquid is transported to the second treatment tank 2 through the first cleaning pipe 41 for cleaning. When the filter membrane cartridge 6 needs to be cleaned, the first three-way valve 33 is adjusted to connect the backflush pipe 32 and the outlet pipe 63. At the same time, the second three-way valve 43 is adjusted to connect the second cleaning pipe 42 and the end of the backflush pipe 32 close to the outlet pipe 63. The backflush pipe 32 is started, and the cleaning liquid passes through the second cleaning pipe 42, the backflush pipe 32 and the outlet pipe 63 and then enters the filter membrane cartridge 6 to clean the filter membrane cartridge 6.

[0066] The cleaned waste liquid can be sprayed into the second treatment tank 2 through the filter holes on the filter membrane, and the remaining waste liquid can be discharged through the outlet pipe 63 and the water pipe 31. At this time, the tail end of the water pipe 31 needs to be connected to the waste liquid collection equipment, thereby improving the convenience of cleaning the second treatment tank 2 and the filter membrane cartridge 6, thereby extending the service life of the filter membrane cartridge 6, improving the separation effect of the filter membrane cartridge 6, and thus improving the treatment efficiency of oily wastewater.

[0067] The working principle of the embodiment of this application is as follows:

[0068] After pre-treatment in the first treatment tank 1, the oily wastewater enters the second treatment tank 2. Multiple filter membrane cartridges 6 separate the oily wastewater, and oil substances remain in the second treatment tank 2. The water is collected in the outlet pipe 63 through the pipeline. The first three-way valve 33 is adjusted to connect the outlet pipe 63 with the water supply pipe 31, and the water supply pump 311 is started. The separated water passes through the outlet pipe 63 and the water supply pipe 31 and is collected in the collection box 3. When backflushing is required, the water supply pump 311 is turned off, the first three-way valve 33 is adjusted to connect the backflush pipe 32 with the outlet pipe 63, and the second three-way valve 43 is adjusted to keep the backflush pipe 32 in a flowing state. The backflush pump 321 is started to reverse the separated water in the collection box 3 through the backflush pipe 32 and the outlet pipe 63 and enter the filter membrane cartridge 6 for backflush.

[0069] During this process, the air pump 71 can be started at any time, and the air flow passes through the main air pipe 711, the air supply pipe 72 and the air injection pipe 73 and is ejected from the nozzle. The nozzle is directed towards the side wall of the filter membrane cartridge 6, so that the air flow drives the filter membrane cartridge 6 to vibrate, thereby causing the oil substances attached to the surface of the filter membrane cartridge 6 to fall off. At the same time, the bubbles generated by the air flow in the wastewater drive the oil substances to rise and float to the surface of the wastewater, thereby reducing the probability of the surface of the filter membrane cartridge 6 being blocked by oil substances, improving the separation effect of the filter membrane cartridge 6, and thus improving the treatment efficiency of oily wastewater.

[0070] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An oily wastewater treatment device, characterized in that: The invention comprises a first treatment tank (1), a second treatment tank (2) and a collection box (3) which are arranged in sequence. The first treatment tank (1) is provided with an oil separation mechanism (5) for treating floating oil and dispersed oil. The second treatment tank (2) is connected to the first treatment tank (1) via a delivery pipe (21). The second treatment tank (2) is provided with a filter membrane cartridge (6). The collection box (3) is connected to the filter membrane cartridge (6) via a water delivery pipe (31). The second treatment tank (2) is provided with an injection assembly (7) for reducing blockage of the filter membrane cartridge (6).

2. The oily wastewater treatment device according to claim 1, characterized in that: There are a plurality of filter membrane cartridges (6), and the plurality of filter membrane cartridges (6) are arranged at intervals in the second treatment tank (2) and extend vertically. The bottom end of the filter membrane cartridge (6) has a closing cover (61), and the top ends of the plurality of filter membrane cartridges (6) are connected through a water outlet pipe (63). The end of the water outlet pipe (63) away from the second treatment tank (2) is connected to a water supply pipe (31), and a water supply pump (311) is provided on the water supply pipe (31).

3. The oily wastewater treatment device according to claim 2, characterized in that: The jet assembly (7) comprises: An air pump (71), wherein the outlet end of the air pump (71) is connected to a main air pipe (711); a plurality of air delivery pipes (72) arranged at intervals on the main air pipe (711) and in communication with the main air pipe (711); an end of the air delivery pipe (72) away from the main air pipe (711) extending between two adjacent filter membrane cylinders (6); The air jet pipe (73) is arranged at one end of the air delivery pipe (72) away from the main air pipe (711), and the top end of the air jet pipe (73) has two nozzles, and the two nozzles are respectively directed towards the side walls of two adjacent filter membrane cylinders (6).

4. The oily wastewater treatment device according to claim 2, characterized in that: The collecting box (3) is provided with a backflushing pipe (32), and a backflushing pump (321) is provided on the backflushing pipe (32). The backflushing pipe (32) is connected to the connection point of the water supply pipe (31) and the water outlet pipe (63). A first three-way valve (33) is provided at the connection point of the backflushing pipe (32), the water supply pipe (31) and the water outlet pipe (63). When water is discharged, the first three-way valve (33) controls the water outlet pipe (63) to be connected to the water supply pipe (31). When backflushing, the first three-way valve (33) controls the water outlet pipe (63) to be connected to the backflushing pipe (32).

5. The oily wastewater treatment device according to claim 2, characterized in that: A horizontally extending mounting plate (22) is provided in the second treatment tank (2), a mounting ring (221) is provided at the front end of the mounting plate (22), the filter membrane cartridge (6) is vertically inserted into the mounting ring (221), and a positioning assembly (23) for positioning the filter membrane cartridge (6) is provided on the mounting ring (221).

6. The oily wastewater treatment device according to claim 5, characterized in that: The positioning assembly (23) comprises: A positioning block (231), the positioning block (231) being provided on the filter membrane cartridge (6) and abutting against the mounting ring (221); A positioning rod (232) passes through the positioning block (231) and is threadedly connected to the mounting ring (221).

7. The oily wastewater treatment device according to claim 1, characterized in that: The oil distribution mechanism (5) comprises: A partition (51), the partition (51) being arranged in the first treatment pool (1), the partition (51) dividing the first treatment pool (1) into a first chamber (11) and a second chamber (12), the partition (51) being provided with a water port (511) communicating with the first chamber (11) and the second chamber (12), the partition (51) being provided with an oil retaining column (512), the bottom end of the oil retaining column (512) being in an open state, the oil retaining column (512) being in communication with the water port (511), and the delivery pipe (21) being in communication with the second chamber (12); A first water barrier (52), the first water barrier (52) being vertically arranged in the first chamber (11), and a first water flow space (521) being defined between the bottom end of the first water barrier (52) and the bottom end of the first treatment tank (1); A second water baffle (53), the second water baffle (53) being vertically arranged in the second chamber (12), and a second water flow space (531) being defined between the bottom end of the second water baffle (53) and the bottom end of the first treatment tank (1); a water outlet baffle (54), the water outlet baffle (54) being vertically arranged in the second chamber (12) and located between the second water baffle (53) and the delivery pipe (21), and a water outlet space (541) being defined between the water outlet baffle (54) and the bottom end of the second chamber (12); A filter element (55) is provided in the first chamber (11), between the inner wall of the first treatment tank (1) and the first water baffle (52), and above the first water flow space (521).

8. The oily wastewater treatment device according to claim 7, characterized in that: The filter element (55) comprises a first filter basket (551) and a second filter basket (552); the first filter basket (551) is hung in the first chamber (11) via a mounting plate (56); and the second filter basket (552) is arranged below the first filter basket (551).

9. The oily wastewater treatment device according to claim 7, characterized in that: The invention also comprises a cleaning box (4), wherein the cleaning liquid is contained in the cleaning box (4), and a first cleaning pipe (41) and a second cleaning pipe (42) are provided on the cleaning box (4), wherein the first cleaning pipe (41) extends into the second treatment tank (2) and is provided with a cleaning pump (411), and the second cleaning pipe (42) is connected to the backwash pipe (32), and a second three-way valve (43) is provided at the connection between the second cleaning pipe (42) and the backwash pipe (32).

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