Multiple coalescence oily sewage treatment equipment and process adopting backwash self-expanding filter pipe

Abstract

The application discloses a multiple coalescence oily sewage treatment equipment and process adopting backwashing self-unfolding filter pipes, relates to the multi-stage treatment technical field of contaminated wastewater, and discloses a multiple coalescence oily sewage treatment equipment adopting backwashing self-unfolding filter pipes, which comprises a tank body used for filtering and treating oily sewage. Through the cooperation of the oil and water discharge assembly and the filtering assembly, the multiple coalescence oily sewage treatment equipment forms multiple-stage treatment of the sewage and effectively separates and collects the separated oil. In the process of multiple treatment of the sewage, the filtering assembly can be repeatedly used with high quality by better stripping of the pollutants attached to the filtering assembly through the self-unfolding function of the filter core during backwashing. In the process of use of the filtering assembly, the filtering assembly can be respectively reinforced and locked and loosened according to different processes of sewage treatment and backwashing through the cooperation of the elastic locking assembly and the adjusting assembly, so that the effects of sewage filtration and separation and stripping of the adsorbents are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of multi-stage treatment of polluted wastewater, in particular to multi-agglomeration oily wastewater treatment equipment and a process using backwashing self-expanding filter tubes. Background Art

[0002] Oily wastewater refers to a type of wastewater that contains oil droplets of various particle sizes. The properties of wastewater are different depending on the particle size, and the treatment methods used are also different. It is produced in large quantities during the production processes of industries such as oil extraction, refining, and chemical industry.

[0003] For the treatment of oily wastewater, since the particle sizes of oil droplets in oily wastewater are different, sewage treatment equipment often connects multiple groups of equipment to form a multi-stage treatment of oily wastewater. Combined with the fine filtering structure of the sewage treatment device filter element, oil droplets of different particle sizes can be effectively intercepted. When the oily wastewater passes through the filter element, the oil droplets are first adsorbed on the tiny protrusions or pore edges on the surface of the filter element. As more oil droplets attach, they gradually gather into larger oil droplets. These large oil droplets will continue to collide and merge under the push of water flow, and eventually separate from the water, achieving the effect of separating the oil discharged from the oily wastewater.

[0004] When sewage treatment equipment uses a filter element structure to treat oily sewage, the adsorption and accumulation of particulate matter in the sewage on the surface of the filter element causes the filter element structure to have low permeability, affecting the efficiency of sewage treatment. For this reason, we propose a multi-agglomeration oily sewage treatment equipment and process using backwashing self-expanding filter tubes. Summary of the Invention

[0005] The object of the present invention is to provide a multi-agglomeration oily wastewater treatment device and process using backwash self-expanding filter tubes to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a multi-coagulation oily wastewater treatment device using a backwash self-expanding filter tube, comprising:

[0007] A tank body for filtering and treating oily wastewater, wherein the tank body is provided with a water inlet for assisting water inlet and a water outlet for assisting water outlet, wherein the interior of the tank body is provided with a modified quartz sand particle filter layer for adsorbing and treating the oily wastewater during circulation and a wire mesh agglomerator for assisting in oil removal from the wastewater, wherein the wire mesh agglomerator is located above the modified quartz sand particle filter layer, wherein the tank body is provided with multiple groups, and the water inlets and water outlets on adjacent tank bodies are connected by pipes to form a multi-stage treatment of the oily wastewater, and further comprising:

[0008] The oil and water drainage assembly is installed at the upper end of the tank body and is used to drain oil during sewage treatment and drain water during backwashing treatment;

[0009] A filter assembly is provided inside the tank body for filtering and treating the oily wastewater during the circulation and transportation process. The tank body is provided with an installation assembly for assisting the installation of the filter assembly;

[0010] And an elastic locking assembly, the elastic locking assembly is provided with multiple groups for locking the filter components on the filter assembly, and the filter assembly is provided with an adjustment assembly for adjusting the locking strength of the elastic locking assembly according to the processing method.

[0011] Preferably, the filter assembly includes a connecting cylinder and a mounting circular plate, an annular plate is fixed to the outer side of the connecting cylinder, a filter component is arranged between the annular plate and the mounting circular plate, the filter component is a filter element, the filter element is a folded wedge-shaped structure, and the folding part is arranged in a trapezoidal shape, a plurality of groups of support rods for supporting the inner side of the filter element are fixed between the annular plate and the mounting circular plate, and the plurality of support rods are arranged in a state of an annular array, a barrier separation component for preliminary filtering is arranged between the annular plate and the mounting circular plate, and a handle for assisting in pulling the mounting circular plate is fixed to one side of the mounting circular plate;

[0012] The barrier separation assembly includes a mounting ring, which is fixed to the annular plate by bolts. A plurality of gear rods for separating and blocking particulate matter are fixed in a circular array between the mounting ring and the mounting circular plate, and the gear rods are located on the outside of the filter element.

[0013] Preferably, multiple groups of the elastic locking components are arranged horizontally between the annular plate and the mounting circular plate and are used to lock and pull the outside of the filter element. The elastic locking components include an elastic locking rope, which is sleeved on the outside of the filter element. The two ends of the elastic locking rope are in a crossed state and are fixed with connecting blocks.

[0014] Preferably, the adjustment assembly includes two groups of connecting rods, the connecting blocks at both ends of the elastic locking rope are respectively slidably connected to the two groups of connecting rods, a transmission block is fixed at one end of the connecting rod, two groups of support frames are fixed on the outside of the connecting cylinder, the two groups of transmission blocks are located between the two groups of support frames, a guide rod is slidably connected to the transmission block, the guide rod is fixed between the two groups of support frames, a transmission assembly for transmitting the two groups of transmission blocks is provided on the outside of the connecting cylinder, and a linkage assembly for linking the transmission assembly during the sewage treatment circulation process is provided on the connecting cylinder.

[0015] Preferably, the transmission assembly includes a transmission plate arranged between the transmission block and the connecting cylinder, and two groups of inclined grooves are opened on the transmission plate. The two groups of inclined grooves are slidably connected with transmission pins, and the two groups of transmission pins are respectively fixed to the two groups of transmission blocks.

[0016] Preferably, the linkage assembly includes a mounting groove provided on the connecting tube, a flexible sealing belt for sealing is fixed between the mounting groove and the connecting tube, two groups of linkage rods are fixed on the flexible sealing belt, one end of the two groups of linkage rods are located inside the connecting tube and are fixed with a water pressure plate for transmitting against the water flow, the other end of the two groups of linkage rods are located inside the mounting groove and are fixed with a rectangular plate, a connecting assembly for connecting the rectangular plate is provided inside the mounting groove, and the rectangular plate and the transmission plate are connected and fixed by multiple groups of fixing rods.

[0017] Preferably, the connecting assembly includes a plurality of groups of round rods slidably connected to the rectangular plate, the round rods are fixed inside the mounting grooves, and springs are sleeved on the outer sides of the round rods.

[0018] Preferably, the installation assembly includes a positioning groove opened on the inner side of the water outlet for positioning the connecting tube, and a replacement port for installing the entire filter assembly is opened on the tank body. The replacement port and the water outlet are symmetrically arranged on both sides of the tank body, and a blocking plate for sealing the replacement port is fixed on the replacement port by bolts.

[0019] Preferably, the oil drain assembly includes an oil drain cylinder fixed to the upper end of the tank body, the oil drain cylinder is equipped with an oil drain port for draining oil and a drain port for draining water during backwashing, an oil level sensor for oil layer identification is installed inside the oil drain cylinder, and an oil drain pump for pumping oil is provided on the oil drain port.

[0020] Preferably, the multi-coagulation oily wastewater treatment process using backwash self-expanding filter tubes comprises the following steps:

[0021] S1: According to the treatment requirements, the water inlets and outlets between each group of adjacent tanks are connected through pipes. After the connection is completed, the water inlet on the frontmost tank is connected to the three-phase separator, and the water outlet on the rearmost tank is connected to the water injection tank;

[0022] S2: After the connection is completed, the sewage after preliminary separation is transported to the inside of the tank through the three-phase separator through the water inlet. During the transportation process, the sewage flows through each group of tanks in turn due to the effect of pressure and the interconnection between the groups of tanks. During the process of passing through, the impurities and oil in the sewage are separated and processed by the modified quartz sand particle filter layer inside the multiple groups of tanks and the filter element on the filter assembly, forming a multi-stage treatment of sewage to ensure the effect of the treatment of oily sewage;

[0023] S3: When the oily sewage passes through the filter element, the floating oil in the oily sewage will directly float up, and the dispersed oil and emulsified oil in the oily sewage are first adsorbed on the surface of the filter element, and with the attachment of more oil droplets, they gradually gather into larger oil droplets, and under the push of the water flow, these large oil droplets continue to collide and merge, and finally separate from the water to form an oil layer between the oil discharge cylinder and the tank, and through the oil level sensor arranged in the oil discharge cylinder, the oil layer is identified, and when it is identified, the oil discharge pump is started to discharge oil, and when the oil in the oil discharge cylinder and the tank is discharged, the oil discharge pump is closed, and only the oil layer is discharged, the oil-water mixed layer is not discharged, and with time, the oil and water can be gradually separated, the oil floats to form a new oil layer, facilitating continuous oil separation and oil discharge operation;

[0024] S4: After a period of oily sewage treatment, the sewage delivery is stopped, and the cleaned water in the water injection tank is delivered to the inside of the tank through the water outlet and finally discharged outward through the drain, and in the reverse delivery process of the cleaned water in the tank, the cleaned water passes through the filter element from the opposite direction of the water flow during normal sewage treatment, forming a backwashing effect on the filter element, and the high-speed water flow impacts the surface of the filter element to strip the attached pollutants, facilitating the repeated use of the filter element with high quality.

[0025] S5: During the whole multi-stage sewage treatment and subsequent backwashing separation operation, due to the folded wedge structure of the filter element, the water enters from the circumference and the water flows out from the inner cavity, and under the action of water pressure, the filter element is self-tightened and dense when filtering the sewage to adsorb small oil droplets, and the filter element can be reversely expanded when backwashing to release the intercepted particulate impurities, desorb the adsorbed oil droplets and initial scale layer, and when the sewage passes through the filter element and the connecting cylinder on the filter assembly, the two groups of transmission blocks are forced to move close to each other through transmission, and in the process of moving close to each other, the elastic locking rope is tightened and pulled through the connection of the two groups of connecting rods and connecting blocks, and in the process of tightening, the filter element is further self-tightened and dense through the abutting action of the elastic locking rope and the outer side of the filter element, facilitating the adsorption of small oil droplets and further ensuring the oil filtration and separation effect during the sewage treatment process.

[0026] S6: During the subsequent backwashing operation, the cleaned water is delivered in the connecting cylinder through transmission, and in the process of reverse delivery, the two groups of transmission blocks are forced to move away from each other through transmission, and in the process of moving away from each other, the elastic locking rope is relaxed through the connection of the two groups of connecting rods and connecting blocks, further reducing the binding effect of the elastic locking rope on the filter element, so that the filter element can be fully reversely expanded through the pressure action of the delivered cleaned water and the filter element during backwashing, ensuring the stripping effect of the adsorbed substances on the surface of the filter element.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] The present invention forms multi-stage treatment of sewage and effectively separates and collects the separated oil and liquid through the mutual cooperation of the oil and water discharge component and the filter component. In the process of multiple sewage treatments, the pollutants attached to the filter component are stripped off through the backflushing effect, so that the filter component can be reused with high quality. In addition, during the use of the filter component, the elastic locking component and the adjustment component cooperate with each other, and the filter component can be tightened and loosened according to the different processes of sewage treatment and backflushing, thereby ensuring the effect of sewage filtration separation and adsorbent stripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the tank body of the present invention;

[0031] Figure 3 This is a schematic diagram of the installation assembly structure of the present invention;

[0032] Figure 4 This is a schematic structural diagram of the barrier separation assembly of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the filter assembly and elastic locking assembly of the present invention;

[0034] Figure 6 This is a schematic diagram of the filter assembly structure of the present invention;

[0035] Figure 7 It is a schematic structural diagram of the filter element and elastic locking assembly of the present invention;

[0036] Figure 8 It is a schematic structural diagram of the adjustment component and the transmission component of the present invention;

[0037] Figure 9 It is a schematic diagram of the linkage assembly structure of the present invention;

[0038] Figure 10 This is a schematic diagram of the connection assembly structure of the present invention;

[0039] Figure 11 This is a schematic diagram of the adjustment state of the elastic locking assembly during filtration processing of the present invention;

[0040] Figure 12 This is a schematic diagram of the adjustment state of the elastic locking assembly during backwashing of the present invention;

[0041] Figure 13 Schematic diagram of water flow direction during filtration, oil drainage and backwashing of the present invention;

[0042] Figure 14Process flow chart of oily sewage of the present application;

[0043] Figure 15 Schematic diagram of sewage flow direction of the process of oily sewage of the present application;

[0044] Figure 16 Process flow chart of oil discharge of the present application;

[0045] Figure 17 Process flow chart of backwashing of the present application.

[0046] In the figure: 101 - tank body; 102 - water inlet; 103 - water outlet; 104 - modified quartz sand particle filter layer; 105 - wire mesh coalescer; 201 - oil discharge cylinder; 202 - drain; 203 - oil discharge port; 301 - connecting cylinder; 302 - annular plate; 303 - mounting disc; 304 - support rod; 305 - filter core; 306 - handle; 401 - mounting ring; 402 - stop lever; 501 - positioning groove; 502 - replacement port; 503 - blocking plate; 601 - elastic locking rope; 602 - connecting block; 701 - connecting rod; 702 - transmission block; 703 - support frame; 704 - guide rod; 801 - transmission plate; 802 - inclined groove; 803 - transmission pin; 901 - mounting groove; 902 - rectangular plate; 903 - flexible sealing band; 904 - linkage rod; 905 - water pressure plate; 906 - fixed rod; 1001 - round rod; 1002 - spring. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0048] Embodiment 1

[0049] Please refer to Figures 1-17 , the multiple coalescence oily sewage treatment equipment using the backwashing self-expanding filter tube in the figure, comprising:

[0050] The tank 101 is used for filtering and treating oily sewage, and the tank 101 is provided with a water inlet 102 for assisting water inflow and a water outlet 103 for assisting water outflow. The inside of the tank 101 is provided with a modified quartz sand particle filter layer 104 for adsorbing and treating oily sewage in a flow process and a wire mesh coalescer 105 for assisting oil removal treatment of the sewage. The wire mesh coalescer 105 can effectively coalesce the tiny oil droplets in the sewage into larger oil droplets, so that the oil droplets can be more easily separated from water. The wire mesh coalescer 105 is located above the modified quartz sand particle filter layer 104. The tank 101 is provided with multiple groups, and the water inlets 102 and the water outlets 103 on adjacent tanks 101 are connected and communicated through pipelines to form multi-stage treatment of the oily sewage.

[0051] It should be noted that the wire mesh coalescer 105 and the modified quartz sand particle filter layer 104 are conventional components for sewage treatment, and are prior art in this application, which will not be described in detail here.

[0052] Further comprising:

[0053] The oil and water drainage assembly is arranged at the upper end of the tank 101 and is used for draining oil and water during the sewage treatment process and the backwashing process.

[0054] The filter assembly is arranged inside the tank 101 and is used for filtering and treating oily sewage during the flow conveying process. The inside of the tank 101 is provided with a mounting assembly for assisting installation of the filter assembly.

[0055] And the elastic locking assembly is provided with multiple groups for locking the filter components on the filter assembly. The filter assembly is provided with an adjusting assembly for adjusting the locking strength of the elastic locking assembly according to the treatment mode.

[0056] It should be noted that through the cooperation of the oil and water drainage assembly and the filter assembly, multi-stage treatment of the sewage is formed, and the separated oil is effectively separated and collected. During the multiple treatment processes of the sewage, the pollutants attached to the filter assembly are stripped through the backwashing effect, so that the filter assembly can be reused with high quality. In addition, during the use of the filter assembly, the elastic locking assembly and the adjusting assembly cooperate with each other, so that the filter assembly can be locked and released according to different processes of sewage treatment and backwashing, to ensure the effect of sewage filtration and separation and stripping of the adsorbent.

[0057] Preferably, the filter assembly includes a connecting cylinder 301 and a mounting circular plate 303, an annular plate 302 is fixed to the outer side of the connecting cylinder 301, a filter component is arranged between the annular plate 302 and the mounting circular plate 303, the filter component is a filter element 305, the filter element 305 is a folded wedge-shaped structure, and the folded part is arranged in a trapezoidal shape, a plurality of groups of support rods 304 for supporting the inner side of the filter element 305 are fixed between the annular plate 302 and the mounting circular plate 303, and the plurality of groups of support rods 304 are arranged in a state of an annular array, a barrier separation assembly for preliminary filtering and blocking is arranged between the annular plate 302 and the mounting circular plate 303, and a handle 306 for assisting in pulling the mounting circular plate 303 is fixed to one side of the mounting circular plate 303;

[0058] It should be noted here that: the sewage after preliminary separation is transported to the interior of the tank body 101 through the water inlet 102 by the three-phase separator. During the transportation process, the sewage is caused to flow through each group of tank bodies 101 in sequence due to the action of pressure and the interconnection between the groups of tank bodies 101. During the process of passing through, the impurities and oil in the sewage are separated and processed by the modified quartz sand particle filter layer 104 inside the multiple groups of tank bodies 101 and the filter element 305 on the filter assembly, forming a multi-stage treatment of the sewage, ensuring the effect of the treatment of the oily sewage;

[0059] It is worth noting here that the three-phase separator is a conventional technical component for sewage pretreatment. As an existing technology in this technical field, the working principle and operation method will not be described in detail here.

[0060] The barrier and separation assembly includes a mounting ring 401, which is fixed to the annular plate 302 by bolts. A plurality of gear rods 402 for separating and blocking particles are fixed in an annular array between the mounting ring 401 and the mounting circular plate 303. The gear rods 402 are located outside the filter element 305.

[0061] It should be noted that during the sewage transportation process, larger foreign objects are isolated and blocked by the groups of blocking rods 402 on the mounting ring 401 .

[0062] Preferably, multiple sets of elastic locking assemblies are arranged transversely between the annular plate 302 and the mounting circular plate 303 and are used to lock and pull the outer side of the filter element 305. The elastic locking assembly includes an elastic locking rope 601, which is sleeved on the outer side of the filter element 305. The two ends of the elastic locking rope 601 are in a crossed state and fixed with a connecting block 602.

[0063] It should be noted here that the elastic locking rope 601 is used to facilitate maintaining the installation effect of the filter element 305.

[0064] Preferably, the adjustment assembly includes two groups of connecting rods 701, the connecting blocks 602 at both ends of the elastic locking rope 601 are respectively slidably connected to the two groups of connecting rods 701, a transmission block 702 is fixed to one end of the connecting rod 701, two groups of support frames 703 are fixed to the outside of the connecting cylinder 301, the two groups of transmission blocks 702 are located between the two groups of support frames 703, a guide rod 704 is slidably connected to the transmission block 702, and the guide rod 704 is fixed between the two groups of support frames 703, a transmission assembly for transmitting the two groups of transmission blocks 702 is provided on the outside of the connecting cylinder 301, and a linkage assembly for linking the transmission assembly during the sewage treatment circulation process is provided on the connecting cylinder 301;

[0065] It should be noted here that: when sewage passes through the filter element 305 and the connecting cylinder 301 on the filter assembly, the two sets of transmission blocks 702 are forced to move closer to each other through the transmission assembly and the linkage assembly. During the process of the two sets of transmission blocks 702 moving closer to each other, the elastic locking rope 601 is tightened and pulled by the connection between the two sets of connecting rods 701 and the connecting block 602. During the tightening process, the elastic locking rope 601 and the outer side of the filter element 305 are offset, so that the filter element 305 is further tightened and compacted by itself. When the backflushing operation is subsequently performed, the cleaning water is reversely transported in the connecting cylinder 301 through transmission. During the reverse transport process, the two sets of transmission blocks 702 are forced to move away from each other through the transmission action. During the process of the two sets of transmission blocks 702 moving away from each other, the connection between the two sets of connecting rods 701 and the connecting block 602 relaxes the pull on the elastic locking rope 601, further reducing the binding effect of the elastic locking rope 601 on the filter element 305.

[0066] Preferably, the transmission assembly includes a transmission plate 801 disposed between the transmission block 702 and the connecting cylinder 301, and the transmission plate 801 is provided with two sets of inclined slots 802, and the two sets of inclined slots 802 are slidably connected to transmission pins 803, and the two sets of transmission pins 803 are respectively fixed to the two sets of transmission blocks 702;

[0067] It should be noted here that: through transmission, the transmission plate 801 is driven to move along the direction of the water transport movement. During the movement of the transmission plate 801, the two groups of inclined grooves 802 interact with the two groups of transmission pins 803 respectively, so that the two groups of transmission blocks 702 are forced to move closer to or away from each other.

[0068] Preferably, the linkage assembly includes a mounting groove 901 provided on the connecting tube 301, a flexible sealing belt 903 for sealing is fixed between the mounting groove 901 and the connecting tube 301, two sets of linkage rods 904 are fixed on the flexible sealing belt 903, one end of the two sets of linkage rods 904 are located inside the connecting tube 301 and are fixed with a water pressure plate 905 for transmitting against the water flow, the other end of the two sets of linkage rods 904 are located inside the mounting groove 901 and are fixed with a rectangular plate 902, a connecting assembly for connecting the rectangular plate 902 is provided inside the mounting groove 901, and the rectangular plate 902 is connected and fixed to the transmission plate 801 by multiple sets of fixing rods 906;

[0069] It should be noted that when sewage passes through the filter element 305 and the connecting cylinder 301 on the filter assembly, the hydraulic plate 905 inside the connecting cylinder 301 is offset by the conveying sewage and the counteracting effect. This causes the hydraulic plate 905 to move inside the connecting cylinder 301 in the direction of sewage conveyance. During this movement, the transmission plate 801 is driven to move in the direction of sewage conveyance through the connection between the linkage rod 904, the rectangular plate 902, and the fixed rod 906.

[0070] It is worth noting here that the flexible sealing belt 903 is used for flexible connection and seals the connection tube 301 and the installation groove 901 to prevent the transported sewage from directly entering the interior of the connection tube 301 through the installation groove 901.

[0071] Preferably, the connecting assembly includes a plurality of round rods 1001 slidably connected to the rectangular plate 902 , the round rods 1001 are fixed inside the mounting groove 901 , and the outer side of the round rods 1001 is provided with a spring 1002 ;

[0072] It should be noted that the movement of the rectangular plate 902 is guided by the multiple groups of round rods 1001 , and the spring 1002 is used to assist in resetting the rectangular plate 902 after being subjected to force.

[0073] Preferably, the installation assembly includes a positioning groove 501 provided on the inner side of the water outlet 103 for inserting and positioning the connecting tube 301, and a replacement port 502 for inserting and installing the entire filter assembly is provided on the tank body 101. The replacement port 502 and the water outlet 103 are symmetrically arranged on both sides of the tank body 101, and a plugging plate 503 for blocking the replacement port 502 is fixed on the replacement port 502 by bolts.

[0074] It should be noted here that: the filter assembly is pushed into the interior of the tank body 101 through the replacement port 502. During the pushing process, the front end of the connecting tube 301 is inserted into the interior of the positioning groove 501. After pushing it in and installing, the blocking plate 503 is installed and fixed on the replacement port 502 to seal the replacement port 502.

[0075] Preferably, the oil and water drainage assembly includes an oil drain cylinder 201 fixed to the upper end of the tank body 101, and an oil drain port 203 for draining oil and a water drain port 202 for draining water during backwashing are installed on the oil drain cylinder 201. An oil level sensor for oil layer identification is installed inside the oil drain cylinder 201, and an oil drain pump for pumping oil is provided on the oil drain port 203.

[0076] It should be noted here that: the oil level sensor provided inside the oil drain barrel 201 is used to identify the oil layer. When identified, the oil drain pump is turned on to drain the oil. After the oil in the oil drain barrel 201 and the tank body 101 is discharged, the oil drain pump is turned off, and only the oil layer is discharged, and the oil-water mixed layer is not discharged. Over time, the oil and water can gradually separate, and the oil floats up to form a new oil layer, which is convenient for continuous oil separation and oil discharge operations. After treating the oily wastewater for a period of time, the sewage transportation is stopped and the cleaning water treated inside the water injection tank is reversely transported to the inside of the tank body 101 through the water outlet 103 and finally discharged outward through the drain port 202. During the reverse transportation of the cleaning water on the tank body 101, the cleaning water passes through the filter element 305 and is opposite to the direction of the water flow during normal sewage treatment, forming a backwash effect on the filter element 305, and uses high-speed water flow to impact the surface of the filter element 305 to peel off the attached pollutants, so that the filter element 305 can be reused with high quality.

[0077] In this scheme: the multi-coagulation oily wastewater treatment process using backwash self-expanding filter tubes includes the following steps:

[0078] S1: According to the treatment requirements, the water inlets 102 and the water outlets 103 between the adjacent tanks 101 of each group are connected through pipes. After the connection is completed, the water inlet 102 on the frontmost tank 101 is connected to the three-phase separator, and the water outlet 103 on the rearmost tank 101 is connected to the water injection tank (see Figure 15 connection status);

[0079] S2: After the connection is completed, the sewage after preliminary separation is transported to the inside of the tank body 101 through the three-phase separator through the water inlet 102. During the transportation process, the sewage flows through each group of tank bodies 101 in sequence due to the action of pressure and the interconnection between the groups of tank bodies 101. During the process of passing through, the impurities and oil in the sewage are separated and processed by the modified quartz sand particle filter layer 104 inside the multiple groups of tank bodies 101 and the filter element 305 on the filter assembly, forming a multi-stage treatment of the sewage, ensuring the effect of the treatment of the oily sewage;

[0080] S3: When the oily sewage passes through the filter core 305, the floating oil in the oily sewage will directly float up, and the dispersed oil and emulsified oil in the oily sewage will first be adsorbed on the surface of the filter core 305. With the attachment of more oil droplets, they gradually gather into larger oil droplets. These large oil droplets, under the push of the water flow, will continue to collide and merge, and finally separate from the water to form an oil layer between the oil discharge cylinder 201 and the tank body 101. Through the oil level sensor arranged inside the oil discharge cylinder 201, the oil layer is identified, and when it is identified, the oil discharge pump is started to discharge oil. When the oil in the oil discharge cylinder 201 and the tank body 101 is discharged, the oil discharge pump is turned off, and only the oil layer is discharged, and the oil-water mixed layer is not discharged. With time, the oil and water can be gradually separated, and the oil floats to form a new oil layer, facilitating continuous oil-water separation and oil discharge operation (see Figure 13 and Figure 16 );

[0081] S4: After a period of oily sewage treatment, the sewage delivery is stopped, and the cleaned water in the water injection tank is delivered in the reverse direction to the inside of the tank body 101 through the water outlet 103 and finally discharged outward through the water outlet 202 (see Figure 13 and Figure 17 ). During the reverse delivery of the cleaning water in the tank body 101, the cleaning water passes through the filter core 305 in the opposite direction of the water flow during normal sewage treatment, forming a backwashing effect on the filter core 305. The high-speed water flow impacts the surface of the filter core 305 to strip off the attached pollutants, facilitating the repeated use of the filter core 305 with high quality;

[0082] S5: During the entire sewage multi-stage treatment and subsequent backwashing separation operation, due to the folded wedge structure of the filter core 305, the circumferential water inlet, and the inner cavity water outlet, under the action of water pressure during sewage filtration, the filter core 305 is self-tightened and densified, adsorbing small oil droplets. During backwashing, the filter core 305 can be reversely expanded, the folded surface is opened, the intercepted particulate impurities are released, the adsorbed oil droplets and the initial layer of scale are detached, and when the sewage passes through the filter core 305 and the connecting cylinder 301 of the filtration assembly, the water pressure plate 905 is moved in the direction of the sewage delivery inside the connecting cylinder 301 through the transmission effect of the delivered sewage and the water pressure plate 905 inside the connecting cylinder 301. During the movement, through the connection of the linkage rod 904, the rectangular plate 902 and the fixed rod 906, the transmission plate 801 is driven to move in the direction of the sewage delivery. During the movement of the transmission plate 801, through the interaction of the two groups of inclined grooves 802 and the two groups of transmission pins 803, the two groups of transmission blocks 702 are forced to move closer to each other. During the mutual approaching movement of the two groups of transmission blocks 702, through the connection of the two groups of connecting rods 701 and the connecting block 602, the elastic locking rope 601 is tightened and pulled (see Figure 11), during the tightening process, the elastic locking rope 601 counteracts the outer side of the filter element 305, so that the filter element 305 is further tightened and compacted, which is convenient for absorbing small oil droplets, further ensuring the effect of oil filtration and separation in the sewage treatment process;

[0083] S6: When the backwash operation is subsequently performed, the cleaning liquid is reversely transported in the connecting cylinder 301 through the transmission. During the reverse transport process, the two sets of transmission blocks 702 are forced to move away from each other through the transmission action. During the movement of the two sets of transmission blocks 702 away from each other, the connection between the two sets of connecting rods 701 and the connecting blocks 602 relaxes the pull on the elastic locking rope 601 (see Figure 12 ), further reducing the restraining effect of the elastic locking rope 601 on the filter element 305, so that during the backwash process, the filter element 305 can fully expand in the reverse direction through the pressure of the delivered cleaning water and the filter element 305, thereby ensuring the stripping effect of the adsorbent on the surface of the filter element 305.

[0084] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0085] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Multiple coalescence oily wastewater treatment equipment using backwash self-expanding filter tubes, including: A tank body (101) for filtering and treating oily wastewater, wherein the tank body (101) is provided with a water inlet (102) for assisting water inlet and a water outlet (103) for assisting water outlet, wherein the interior of the tank body (101) is provided with a modified quartz sand particle filter layer (104) for adsorbing and treating the oily wastewater during circulation, and a wire mesh agglomerator (105) for assisting in oil removal from the wastewater, wherein the wire mesh agglomerator (105) is located above the modified quartz sand particle filter layer (104), wherein the tank body (101) is provided with multiple groups of water inlets (102) and water outlets (103) on adjacent tank bodies (101) are connected to each other through pipes, thereby forming a multi-stage treatment for the oily wastewater; It is characterized by further comprising: An oil and water drainage assembly is provided at the upper end of the tank body (101) and is used for draining oil during sewage treatment and draining water during backwashing; A filter assembly is arranged inside the tank body (101) for filtering and treating oily wastewater during the circulation and transportation process, and a mounting assembly for assisting in the installation of the filter assembly is provided inside the tank body (101); and an elastic locking assembly, wherein the elastic locking assembly is provided with multiple groups for locking the filter component on the filter assembly, and the filter assembly is provided with an adjustment assembly for adjusting the locking strength of the elastic locking assembly according to the treatment mode; The filter assembly comprises a connecting cylinder (301) and a mounting circular plate (303); an annular plate (302) is fixed to the outside of the connecting cylinder (301); a filter component is provided between the annular plate (302) and the mounting circular plate (303); the filter component is a filter element (305); the filter element (305) is a folded wedge-shaped structure, and the folded portion is arranged in a trapezoidal shape; A plurality of groups of elastic locking components are arranged transversely between the annular plate (302) and the mounting circular plate (303) and are used to lock and pull the outside of the filter element (305). The elastic locking components include an elastic locking rope (601) which is sleeved on the outside of the filter element (305). Both ends of the elastic locking rope (601) are in a crossed state and are fixed with a connecting block (602). The adjustment component comprises two groups of connecting rods (701), the connecting blocks (602) at both ends of the elastic locking rope (601) are respectively slidably connected to the two groups of connecting rods (701), a transmission block (702) is fixed to one end of the connecting rod (701), two groups of support frames (703) are fixed to the outside of the connecting cylinder (301), the two groups of transmission blocks (702) are located between the two groups of support frames (703), a guide rod (704) is slidably connected to the transmission block (702), the guide rod (704) is fixed between the two groups of support frames (703), a transmission component for transmitting the two groups of transmission blocks (702) is provided on the outside of the connecting cylinder (301), and a linkage component for linking the transmission component during the sewage treatment circulation process is provided on the connecting cylinder (301); The transmission assembly comprises a transmission plate (801) disposed between the transmission block (702) and the connecting cylinder (301), the transmission plate (801) being provided with two groups of inclined slots (802), the two groups of inclined slots (802) being slidably connected with transmission pins (803), and the two groups of transmission pins (803) being fixed to the two groups of transmission blocks (702) respectively; The linkage assembly comprises a mounting groove (901) provided on the connecting tube (301); a flexible sealing belt (903) for sealing is fixed between the mounting groove (901) and the connecting tube (301); two groups of linkage rods (904) are fixed on the flexible sealing belt (903); one end of the two groups of linkage rods (904) is located inside the connecting tube (301) and is fixed with a water pressure plate (905) for resisting the water flow; the other end of the two groups of linkage rods (904) is located inside the mounting groove (901) and is fixed with a rectangular plate (902); a connecting assembly for connecting the rectangular plate (902) is provided inside the mounting groove (901); the rectangular plate (902) and the transmission plate (801) are connected and fixed by a plurality of groups of fixing rods (906).

2. The multi-coalescing oily wastewater treatment equipment using backwash self-expanding filter tubes according to claim 1 is characterized in that: A plurality of groups of support rods (304) for supporting the inner side of the filter element (305) are fixed between the annular plate (302) and the mounting circular plate (303), and the plurality of groups of support rods (304) are arranged in a ring array. A barrier separation assembly for preliminary filtering and barrier separation is provided between the annular plate (302) and the mounting circular plate (303). A handle (306) for assisting in pulling the mounting circular plate (303) is fixed on one side of the mounting circular plate (303); The barrier separation assembly comprises a mounting ring (401), the mounting ring (401) being connected and fixed to the annular plate (302) via bolts, and a plurality of groups of shift rods (402) for separating and blocking particles are fixed in an annular array between the mounting ring (401) and the mounting circular plate (303), the shift rods (402) being located outside the filter element (305).

3. The multi-coalescing oily wastewater treatment equipment using backwash self-expanding filter tubes according to claim 1 is characterized in that: The connecting assembly comprises a plurality of groups of round rods (1001) slidably connected to the rectangular plate (902), the round rods (1001) being fixed inside the mounting groove (901), and springs (1002) being sleeved on the outer sides of the round rods (1001).

4. The multi-coalescing oily wastewater treatment equipment using backwash self-expanding filter tubes according to claim 2 is characterized in that: The installation assembly comprises a positioning groove (501) provided on the inner side of the water outlet (103) for inserting and positioning the connecting cylinder (301); a replacement port (502) for inserting and installing the entire filter assembly is provided on the tank body (101); the replacement port (502) and the water outlet (103) are symmetrically arranged on both sides of the tank body (101); a blocking plate (503) for blocking the replacement port (502) is fixed to the replacement port (502) by bolts.

5. The multi-coalescing oily wastewater treatment equipment using backwash self-expanding filter tubes according to claim 1 is characterized in that: The oil and water drainage assembly comprises an oil drain cylinder (201) fixed to the upper end of the tank body (101), an oil drain port (203) for draining oil and a drain port (202) for draining water during backwashing are installed on the oil drain cylinder (201), an oil level sensor for oil layer identification is installed inside the oil drain cylinder (201), and an oil drain pump for pumping oil is provided on the oil drain port (203).

6. A process for treating oily wastewater by using a multiple coalescence method with a backwashing self-expanding filter tube, which is based on the equipment for treating oily wastewater by using a multiple coalescence method with a backwashing self-expanding filter tube as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: According to the treatment requirements, the water inlets (102) and the water outlets (103) between each group of adjacent tank bodies (101) are connected through pipes. After the connection is completed, the water inlet (102) on the frontmost tank body (101) is connected to the three-phase separator, and the water outlet (103) on the rearmost tank body (101) is connected to the water injection tank; S2: After the connection is completed, the sewage after preliminary separation is transported to the inside of the tank body (101) through the three-phase separator through the water inlet (102). During the transportation process, the sewage is allowed to flow through each group of tank bodies (101) in sequence due to the action of pressure and the interconnection between the groups of tank bodies (101). During the process of passing through, the impurities and oil in the sewage are separated and processed through the modified quartz sand particle filter layer (104) inside the multiple groups of tank bodies (101) and the filter element (305) on the filter assembly, forming a multi-stage treatment of the sewage, ensuring the effect of the treatment of the oily sewage; S3: When the oily wastewater passes through the filter element (305), the floating oil in the oily wastewater will directly float up, and the dispersed oil and emulsified oil in the oily wastewater will first be adsorbed on the surface of the filter element (305). As more oil droplets adhere, they gradually gather into larger oil droplets. These large oil droplets will continue to collide and merge under the push of the water flow, and eventually separate from the water to form an oil layer between the oil discharge barrel (201) and the tank body (101). The oil level sensor set inside the oil discharge barrel (201) identifies the oil layer. When it is identified, the oil discharge pump is turned on to discharge the oil. After the oil in the oil discharge barrel (201) and the tank body (101) is discharged, the oil discharge pump is turned off, and only the oil layer is discharged. The oil-water mixed layer is not discharged. Over time, the oil and water are gradually separated, and the oil floats up to form a new oil layer, which facilitates continuous oil separation and oil discharge operations; S4: After the oily wastewater has been treated for a period of time, the transportation of the wastewater is stopped and the treated cleaning water in the water injection tank is reversely transported to the inside of the tank body (101) through the water outlet (103) and finally discharged outward through the drain outlet (202). During the reverse transportation of the cleaning water on the tank body (101), the cleaning water passes through the filter element (305) and flows in the opposite direction to the direction of the water flow during normal wastewater treatment, thereby forming a backwashing effect on the filter element (305). The high-speed water flow impacts the surface of the filter element (305) to peel off the attached pollutants, thereby facilitating the high-quality reuse of the filter element (305); S5: During the whole process of multi-stage sewage treatment and subsequent backwash separation, since the filter element (305) is a folded wedge structure, water enters circumferentially and exits from the inner cavity, the filter element (305) automatically tightens and densifies under the action of water pressure during sewage filtration, adsorbing fine oil droplets. During backwashing, the filter element (305) can expand in the opposite direction, and the folded surface opens to release the intercepted particles and foreign matter, and desorb the adsorbed oil droplets and the initial layer of scaling. When the sewage passes through the filter element (305) and the connecting tube (301) on the filter assembly, the two sets of transmissions are connected by transmission. The moving blocks (702) are forced to move closer to each other. During the process of the two sets of transmission blocks (702) moving closer to each other, the elastic locking rope (601) is tightened and pulled through the connection between the two sets of connecting rods (701) and the connecting blocks (602). During the tightening process, the elastic locking rope (601) and the outer side of the filter element (305) are offset against each other, so that the filter element (305) is further tightened and compacted by itself, which is convenient for absorbing fine oil droplets, and further ensures the effect of oil filtration and separation in the sewage treatment process. S6: When the backwash operation is subsequently performed, the cleaning water is transported in the reverse direction in the connecting cylinder (301) through the transmission. During the reverse transport process, the two sets of transmission blocks (702) are forced to move away from each other through the transmission action. During the movement of the two sets of transmission blocks (702) away from each other, the pulling of the elastic locking rope (601) is relaxed through the connection between the two sets of connecting rods (701) and the connecting blocks (602), further reducing the binding effect of the elastic locking rope (601) on the filter element (305). Therefore, during the backwash process, the filter element (305) is fully expanded in the reverse direction by the pressure of the transported cleaning water and the filter element (305), thereby ensuring the stripping effect of the adsorbed matter on the surface of the filter element (305).

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