An oil-water separation device based on non-point source pollution

Abstract

The present invention relates to an oil-water separation device based on surface source pollution. The oil-water separation device comprises a guide plate, an oil adsorption mechanism, a water baffle, an oil separator and an outer box. A drain port is provided on the outer box. The guide plate is arranged obliquely downward and fixedly connected to the inner wall of the outer box including the drain port. The oil adsorption mechanism is detachably mounted on the inner wall of the other side of the outer box. The bottom end of the oil separator is detachably connected to the oil adsorption mechanism. The bottom end of the guide plate is lower than the top surface of the oil separator. The water baffle is vertically arranged directly below the oil separator. The top end of the water baffle is lower than the top surface of the oil adsorption mechanism and higher than the bottom surface of the oil adsorption mechanism. The present invention absorbs oil in rainwater through the oil adsorption mechanism, intercepts sediment in rainwater through the water baffle, and realizes oil-water separation of rainwater. At the same time, when the flow rate of rainwater is large, the oil layer is intercepted by the guide plate, and rainwater overflows from between the guide plate and the oil separator, so as to keep the rainwater discharged smoothly.

Description

Technical Field

[0001] The invention relates to an oil-water separation device, in particular to an oil-water separation device based on surface source pollution. Background Art

[0002] Non-point source pollution, also known as non-point source pollution, mainly refers to the pollution of water bodies caused by pollutants from non-specific locations being washed by rainwater through the runoff process and entering receiving water bodies (including rivers, lakes, reservoirs and bays, etc.) under rainfall conditions. Compared with point source pollution, non-point source pollution has the characteristics of dispersion, concealment, randomness, latency, accumulation and ambiguity, so it is not easy to monitor and quantify, and it is difficult to study and prevent and control.

[0003] Due to the random discharge of restaurant rainwater or other accidental leakage of oil onto the ground, when it rains, the road rainwater mixed with oil is discharged into the rainwater outlet at the same time, and then flows into the nearby receiving water body through the sewer. Oil pollution is a very difficult source of pollution to deal with. Oil pollution will stick to and block pipes, and will also block filtering devices or facilities, making the filtering devices or filtering facilities impermeable, resulting in paralysis of road rainwater treatment work. Existing front-end pretreatment technologies, such as adding pharmaceutical decomposition technology or filtering technology, are difficult to effectively separate oil pollution and sediment in rainwater when the road rainwater flow rate is high. Summary of the invention

[0004] Based on this, it is necessary to provide an oil-water separation device based on surface source pollution to address the problem of low efficiency in the existing treatment of oily rainwater.

[0005] The present invention is achieved through the following technical scheme: an oil-water separation device based on surface source pollution, which includes: a guide plate, an oil adsorption mechanism, a water baffle, an oil separator, a grille and an outer box.

[0006] The outer box is installed in the rainwater outlet with its opening upward. The oil-stain adsorption mechanism is detachably installed on the inner wall of the outer box away from the drain outlet. The oil-stain adsorption mechanism includes a plurality of oil-absorbing plates. The plurality of oil-absorbing plates are fixedly connected to each other to form a grid-like structure. The grid-like structure includes a plurality of water flow channels that pass through from top to bottom. When rainwater flows through the water flow channels, the oil in the rainwater is adsorbed by the oil-absorbing plates.

[0007] The oil separator is an inverted U-shaped plate. The oil separator opens downward, and the bottom end of one side of the oil separator is detachably connected to the end of the oil adsorption mechanism close to the drain port, and the other side of the oil separator is close to but not in contact with the inner wall of the outer box containing the drain port.

[0008] One end of the guide plate is fixedly connected to the inner wall of the outer box including the drain port, and the other end of the guide plate is tilted downward and does not contact the inner wall of the outer box. The bottom end of the guide plate is higher than the top surface of the oil adsorption mechanism and lower than the top surface of the oil separator.

[0009] The water baffle is vertically arranged in the outer box. The water baffle is located directly below the oil separator. The top of the water baffle is lower than the top surface of the oil adsorption mechanism and the top of the water baffle is higher than the bottom surface of the oil adsorption mechanism.

[0010] The guide plate, the oil separator, the water baffle and the oil adsorption mechanism divide the inner cavity of the outer box into an overflow chamber, an overflow channel, a water storage chamber, a drainage channel and a drainage chamber. The overflow chamber is located above the guide plate. The overflow channel is located between the guide plate and the oil adsorption mechanism and the oil separator. The drainage chamber is located between the water baffle and the inner wall of the outer box on one side including the drainage port. The water storage chamber is located directly below the oil adsorption mechanism. The drainage channel is located between the oil adsorption mechanism, the oil separator and the water baffle. The bottom of the overflow chamber is connected to one end of the overflow channel, and the other end of the overflow channel is connected to the drainage chamber. The water storage chamber is connected to the overflow channel through the oil adsorption mechanism. The water storage chamber is connected to the bottom of the drainage channel, and the top of the drainage channel is connected to the drainage chamber.

[0011] The working process of the oil-water separation device is as follows: the oily rainwater converges on the guide plate and then flows into the water storage chamber through the oil adsorption mechanism. The oily rainwater accumulates in the water storage chamber, and the solid impurities such as mud and sand in the rainwater directly settle at the bottom of the water storage chamber, and the solid impurities are always blocked in the water storage chamber by the water retaining plate. When the rainwater liquid level is higher than the bottom surface of the oil adsorption mechanism and lower than the top surface of the water retaining plate, the oil adsorption mechanism can adsorb the oil in the rainwater, and the rainwater is intercepted in the water storage chamber. When the liquid level of the oily rainwater is higher than the top surface of the water retaining plate and lower than the top surface of the oil separator, the oil adsorption mechanism adsorbs the oil in the oily rainwater, and the oily rainwater after oil absorption flows into the drainage chamber from the drainage channel. When the liquid level of the oily rainwater is higher than the top surface of the oil separator, the oily rainwater is layered in the overflow chamber to form an oil layer and a water layer higher than the bottom of the guide plate, and the oil layer is intercepted in the overflow chamber by the guide plate. A part of the water layer flows into the drainage cavity through the oil adsorption mechanism, the water storage cavity and the drainage channel in sequence, and the other part flows into the drainage cavity through the overflow cavity.

[0012] When the flow rate of rainwater on the road is low, the above-mentioned oil-water separation device absorbs oil and settles the rainwater comprehensively to separate the oil in the rainwater from other liquids, and accumulates the sediment in the rainwater in the water storage chamber, thereby avoiding the blockage of the drainage pipes or other filtering devices by the oil or sediment in the rainwater, and maintaining the smooth discharge of rainwater. When the flow rate of rainwater on the road is high, the rainwater accumulates in the overflow chamber, and then converts from turbulent flow to laminar flow. Among them, the oil in the rainwater is at the top layer, higher than the bottom of the guide plate, and all the oil is intercepted in the overflow chamber, and the sediment in the rainwater continues to accumulate at the bottom of the sewer outlet, thereby maintaining the drainage rate while separating the oil and sediment from the rainwater, avoiding the blockage of the drainage pipes or other filtering devices, and achieving the smooth discharge of rainwater.

[0013] In one embodiment, the oil absorption plate includes a substrate and an oil absorption layer. The substrate is used as a supporting component, and a plurality of substrates are fixedly connected to each other to form a grid structure, so that the oil absorption plate is installed in an outer box as a whole. The oil absorption layer is coated on the substrate to absorb oil. The oil absorption layer adopts oleophilic and hydrophobic oil absorption cotton.

[0014] In one embodiment, at least two sliders are fixedly connected to the outer wall of the oil adsorption mechanism, and a slide groove for the sliders to move up and down is provided on the inner wall of the outer box. When the sliders move up and down in the slide grooves, the outer wall of the oil adsorption mechanism fits with the inner wall of the outer box.

[0015] In one embodiment, the guide plate is a straight plate or a "7" plate. Two guide rails 1 for installing the guide plate are arranged opposite to each other on the inner wall of the outer box. The two guide rails 1 are vertically installed on the inner wall of the outer box on one side including the drain port.

[0016] In one embodiment, when the guide plate is a "7"-shaped plate, one side of the guide plate is in contact with the inner wall of the outer box including the drain port, and the other side of the guide plate is tilted downward and does not contact the inner wall of the outer box.

[0017] In one embodiment, the water baffle is a straight plate. Two guide rails 2 for mounting the water baffle are arranged on the inner wall of the outer box. The two guide rails 2 are vertically mounted on the inner wall of the outer box. The water baffle is vertically mounted along the guide rails 2, and the water baffle can be raised and lowered on the guide rails 2. When the water baffle is lowered to the bottom of the guide rails 2, the water baffle fits with the outer box on three sides.

[0018] In one embodiment, a through hole for rainwater to flow is provided at the bottom of the water retaining plate. A hole plug is installed on the through hole. When the hole plug is removed from the through hole, rainwater accumulated at the bottom of the outer box is discharged through the through hole and the drainage cavity in sequence. When the hole plug is installed in the through hole, rainwater is intercepted at the bottom of the outer box.

[0019] In one embodiment, a sealing pad is fixedly connected to the outer edge of the water baffle plate. When the water baffle plate descends along the second guide rail to fit the bottom surface of the outer box, the sealing pad is used to achieve sealing between the water baffle plate and the outer box.

[0020] In one embodiment, the grille is mounted on the top of the outer box to filter solid pollutants in road rainwater whose particle size is larger than the grille holes. The shape of the grille matches the opening of the outer box.

[0021] The present invention also provides an oil-water separation device based on surface source pollution. Different from the above-mentioned oil-water separation device, the present oil-water separation device does not use an outer box. The guide plate, oil adsorption mechanism, water baffle and oil separator are directly installed in the rainwater outlet according to the structure of the above-mentioned oil-water separation device.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention sets a guide plate, a water retaining plate and an oil adsorption mechanism. When the flow rate of rainwater on the road is low, the rainwater is fully oil-absorbed and settled to separate the oil in the rainwater from other liquids, and the silt in the rainwater is accumulated in the water storage chamber, thereby avoiding the blockage of the drainage pipes or other filtering devices by the oil or silt in the rainwater, and maintaining the smooth discharge of rainwater. When the flow rate of rainwater on the road is high, the rainwater is accumulated in the overflow chamber, and then converted from turbulent flow to laminar flow. Among them, the oil in the rainwater is at the top layer, higher than the bottom of the guide plate, and the oil is completely intercepted in the overflow chamber, and the silt in the rainwater continues to accumulate at the bottom of the sewer outlet, thereby maintaining the drainage rate while separating the oil and silt from the rainwater, avoiding the blockage of the drainage pipes or other filtering devices, and achieving the smooth discharge of rainwater.

[0024] 2. The present invention adopts oleophilic and hydrophobic oil-absorbing cotton, which can effectively absorb the oil that has been washed with water, absorbing only oil but not water, and has the advantages of temperature resistance, no deformation, large adsorption capacity and wide adsorption area.

[0025] 3. The present invention intercepts the sediment in the rainwater in the water storage chamber through the water retaining plate. When oil-water separation is performed for a long time, the rainwater level in the water storage chamber is not lower than the top of the water retaining plate. By removing the outer box as a whole and removing the water retaining plate, the sediment in the rainwater can be flushed out at one time to avoid clogging the drainage pipes on the road. A hole plug is installed on the water retaining plate, and the water in the water storage chamber can be directly discharged by pulling out the hole plug to avoid the generation of odor after long-term accumulation of rainwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of an oil-water separation device based on non-point source pollution according to Example 1 of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the oil-water separation device after removing the outer box;

[0028] Figure 3 for Figure 2 Schematic diagram of the main structure of the Sinopec water separation unit after removing the outer box;

[0029] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structural section of the middle oil absorption plate;

[0030] Figure 5 Schematic diagram of the cavity structure inside the outer box.

[0031] Main component symbols

[0032] The numbers in the figure are: 1. outer box; 11. drain outlet; 2. oil adsorption mechanism; 21. oil absorption plate; 211. base plate; 212. oil absorption layer; 22. mounting bracket; 23. outer ring bracket; 3. oil separator; 4. guide plate; 41. guide rail one; 5. water retaining plate; 51. guide rail two; 52. hole plug; 6. grille.

[0033] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0037] Example 1

[0038] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a schematic diagram of the three-dimensional structure of an oil-water separation device based on non-point source pollution according to Example 1 of the present invention; Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the oil-water separation device after removing the outer box; Figure 3 for Figure 2 The main structural diagram of the oil-water separation device after the outer box is removed. The oil-water separation device based on non-point source pollution includes: a guide plate 4, an oil adsorption mechanism 2, an oil separator 3, a water baffle 5, a grille 6 and an outer box 1.

[0039] The outer box 1 is installed in the rainwater outlet. A drain port 11 is provided at the bottom end of one of the side walls of the outer box 1, and rainwater flowing into the outer box 1 is discharged through the drain port 11. In the present embodiment, the outer box 1 is a hollow cuboid, and the opening of the outer box 1 matches the road rainwater outlet. When the outer box 1 is installed in the rainwater outlet, the outer box 1 fits the rainwater outlet on all sides to prevent rainwater from seeping out from the gap between the outer box 1 and the rainwater outlet. The outer box 1 includes two narrower side walls and two wider side walls, and the drain port 11 is provided on one of the narrower side walls. The caliber of the drain port 11 should satisfy that when the rainwater flow rate is the maximum, the drainage flow rate of the drain port 11 is not less than the water inlet flow rate of the rainwater outlet. Of course, in other embodiments, the outer box 1 can also be a hollow cylinder or other shapes, as long as it can match the road rainwater outlet so that all the road rainwater flowing to the rainwater outlet can be converged into the outer box 1. There may also be multiple drain outlets 11 , as long as the drainage requirements in the rainwater outlet are met and untreated rainwater is not directly discharged from the drain outlet 11 .

[0040] The oil-absorbing mechanism 2 is detachably mounted on the inner wall of the outer box 1 away from the drain outlet 11. The oil-absorbing mechanism 2 includes a plurality of oil-absorbing plates 21. The plurality of oil-absorbing plates 21 are fixedly connected to each other to form a grid structure. The grid structure includes a plurality of water flow channels that pass through from top to bottom. When rainwater flows through the water flow channels, the oil in the rainwater is absorbed by the oil-absorbing plates 21. The mesh of the grid structure is preferably not smaller than the mesh of the grille 6 to prevent solid impurities in the rainwater from clogging the mesh and reducing the effect of oil absorption.

[0041] Please combine Figure 4 , which is Figure 1 Schematic diagram of the three-dimensional structure of the oil absorption plate. The oil absorption plate 21 includes a substrate 211 and an oil absorption layer 212. The substrate 211 serves as a supporting component, and a plurality of substrates 211 are fixedly connected to each other to form a grid structure, so that the oil absorption plate 21 is installed as a whole in the outer box 1. The oil absorption layer 212 is coated on the substrate 211 and is used to absorb oil. In other embodiments, the oil absorption mechanism 2 can also adopt an integrally formed grid structure, or the grid structure is installed in a shell that penetrates from top to bottom, so that the oil absorption mechanism 2 is installed as a whole in the outer box 1, thereby improving the efficiency of installation or disassembly. The oil absorption plate 21 can also adopt a bent plate, and a plurality of oil absorption plates 21 are fixedly connected to each other to form a plurality of irregular meshes of the same shape. When rainwater passes through the irregular mesh, the flow path can be extended, so that the rainwater is fully in contact with the oil absorption layer 212, and the oil absorption efficiency can be improved. Compared with the grid-shaped oil absorption component, the bent oil absorption layer 212 has a higher manufacturing cost and a higher efficiency in absorbing oil.

[0042] The oil absorption layer 212 is made of oleophilic and hydrophobic oil absorption cotton. The oil absorption cotton can effectively absorb the oil that has passed through water, and only absorbs oil without absorbing water. It has the advantages of being heat-resistant and non-deformable, having a large adsorption capacity, and having a wide adsorption area. Compared with using porous materials such as diatomaceous earth and activated carbon molecular sieves to filter rainwater, rainwater is separated from oil and water by oil absorption cotton, which is not easy to cause filter blockage and poor drainage. Compared with using oil spill dispersants (oil dispersants), alkaline decomposition substances, etc. to separate oil and water, oil absorption cotton is not easy to cause secondary pollution, has low cost, and is easy to maintain. Of course, in other embodiments, the oil absorption layer 212 can also be replaced by diatomaceous earth, activated carbon molecular sieves, oil spill dispersants or alkaline decomposition substances.

[0043] At least two sliders are fixedly connected to the outer wall of the oil adsorption mechanism 2, and a slide groove for the slider to be raised and lowered is provided on the inner wall of the outer box 1. When the slider is raised and lowered in the slide groove, the outer wall of the oil adsorption mechanism 2 fits with the inner wall of the outer box 1. The slider can also be fixedly connected to the oil adsorption mechanism 2 by an elastic support rod, and the elastic support rod is tilted outward so that the slider is beyond the top of the oil adsorption mechanism 2. The slide groove on the outer box 1 is deep at the top and shallow at the bottom. When the slider slides downward in the outer box 1, the support rod contracts inward until the slider slides to the bottom of the slide groove. When an elastic support rod is used, there is always a gap between the oil adsorption mechanism 2 and the outer box 1 during the installation or disassembly process. The oil adsorption mechanism 2 can be positioned in advance by the elastic support rod and the slider, which is convenient for the installation or disassembly of the oil adsorption mechanism 2.

[0044] In other embodiments, the oil adsorption mechanism 2 can also be installed as a whole in a box body that is through from top to bottom, and then fixedly connected to the outer box 1 through the mounting bracket 22. The mounting bracket 22 can be a square frame, which is horizontally arranged and fixedly connected to the inner wall of the outer box 1. The top of the oil adsorption mechanism 2 is provided with an outer ring bracket 23 that matches the shape of the mounting bracket 22. When the oil adsorption mechanism 2 is installed in the outer box 1 along the inner side of the mounting bracket 22, the outer ring bracket 23 just abuts against the mounting bracket 22 and forms a sealing structure with the mounting bracket 22, which can not only improve the efficiency of the installation or removal of the oil adsorption mechanism 2, but also prevent oily rainwater from directly penetrating into the bottom of the outer box 1.

[0045] The oil separator 3 is an inverted U-shaped plate. The oil separator 3 opens downward, and the bottom end of one side of the oil separator 3 is detachably connected to one end of the oil adsorption mechanism 2 near the drain port 11, and the other side of the oil separator 3 is close to but not in contact with the inner wall of one side of the outer box 1 containing the drain port 11. Rainwater accumulates at the bottom of the outer box 1. When the liquid level of rainwater is higher than the top surface of the oil adsorption mechanism 2, the rainwater is intercepted by the oil separator 3 to prevent untreated rainwater from being directly discharged from the drain port 11. The two U-shaped surfaces of the oil separator 3 are respectively fitted with the two wider side walls of the outer box 1, and then form a sealing structure with the outer box 1 to prevent rainwater from seeping through the gap between the oil separator 3 and the inner wall of the outer box 1, so as to improve the treatment efficiency of oil in rainwater. Of course, in other embodiments, the oil separator 3 can also be a straight plate, which is directly fixedly connected to one end of the oil adsorption mechanism 2 near the drain port 11, intercepting rainwater above the oil adsorption mechanism 2 to prevent the oil in the rainwater from being directly discharged.

[0046] One end of the guide plate 4 is fixedly connected to the inner wall of one side of the outer box 1 including the drain port 11, and the other end of the guide plate 4 is tilted downward and does not contact the inner wall of the other side of the outer box 1. The guide plate 4 is attached to the outer box 1 on three sides, and the guide plate 4 and the outer box 1 together form a water inlet. Rainwater converges on the guide plate 4 and then flows into the oil adsorption mechanism 2 from the water inlet.

[0047] The bottom end of the guide plate 4 is higher than the top surface of the oil adsorption mechanism 2 and lower than the top surface of the oil separator 3. The guide plate 4 is a straight plate or a "7" plate. When the guide plate 4 adopts a "7" plate, one side of the guide plate 4 is in contact with the inner wall of the outer box 1 on one side including the drain port 11, and the other side of the guide plate 4 is tilted downward and does not contact the inner wall of the other side of the outer box 1. Compared with the straight plate, the guide plate 4 adopting the "7" plate is easier to install or remove. Two guide rails 41 for installing the guide plate 4 are relatively arranged on the inner wall of the outer box 1, and the two guide rails 41 are vertically installed on the inner wall of the outer box 1 on one side including the drain port 11. The guide plate 4 can be raised and lowered on the guide rail 41, and the height of the guide plate 4 can be adjusted to facilitate the installation or removal of the guide plate 4. When the guide plate 4 adopts a "7" plate, it can also be fixedly connected to the guide rail 41 by bolt connection or clamping. For example, a plurality of mounting holes of different heights are set on the side where the "7" plate is in contact with the inner wall of the outer box 1, and the distance between the guide plate 4 and the oil adsorption mechanism 2 can be adjusted by installing the "7" plate in the mounting holes of different heights. The "7" plate can also be set as a foldable structure, and the two side plates of the "7" plate can be flipped and connected. The fixed connection between the two side plates is achieved by adjusting bolts or other adjustment devices, so that the "7" plate can adjust the relative angle of the two side plates within a preset rotation range (such as 45° to 80°), and then adjust the inclination angle of the guide plate 4 to be suitable for rainwater treatment projects in different environments.

[0048] When the rainwater level is higher than the bottom of the guide plate 4 and lower than the top of the oil separator 3, the rainwater is intercepted on the side of the oil separator 3 close to the oil adsorption mechanism 2. When the rainwater level is higher than the top of the oil separator 3, the rainwater is also higher than the top of the guide plate 4, and then stratified above the guide plate 4. Under the action of gravity, the oil in the rainwater is suspended in the top layer of the rainwater and is always intercepted above the guide plate 4. After stratification, the oil-free water layer in the rainwater overflows between the oil separator 3 and the guide plate 4 to the bottom of the outer box 1, and then is discharged through the drain port 11.

[0049] The water baffle 5 is vertically arranged in the outer box 1. The water baffle 5 is located directly below the oil separator 3. The top of the water baffle 5 is lower than the top surface of the oil adsorption mechanism 2 and the top of the water baffle 5 is higher than the bottom surface of the oil adsorption mechanism 2. The rainwater after the oil adsorption mechanism 2 adsorbs the oil is intercepted by the water baffle 5 at the bottom of the outer box 1, wherein the solid impurities such as mud and sand in the rainwater always settle at the bottom of the outer box 1. When the rainwater liquid level is higher than the top of the water baffle 5, the rainwater after the oil adsorption is discharged through the channel between the water baffle 5 and the oil separator 3.

[0050] The water baffle 5 is a straight plate. Two guide rails 51 for installing the water baffle 5 are relatively arranged on the inner wall of the outer box 1. The two guide rails 51 are vertically installed on the inner wall of the outer box 1. The water baffle 5 is vertically installed along the guide rails 51, and the water baffle 5 can do lifting and lowering movements on the guide rails 51. When the water baffle 5 drops to the bottom of the guide rails 51, the water baffle 5 fits with the outer box 1 on three sides. In order to improve the sealing performance between the water baffle 5 and the outer box 1, a sealing gasket can also be fixedly connected to the outer edge of the water baffle 5. When the water baffle 5 drops along the guide rails 51 to fit with the bottom surface of the outer box 1, the sealing between the water baffle 5 and the outer box 1 is achieved by the sealing gasket.

[0051] A through hole for rainwater to flow is provided at the bottom of the water retaining plate 5. A hole plug 52 is installed on the through hole. When the hole plug 52 is removed from the through hole, rainwater accumulated at the bottom of the outer box 1 is discharged through the through hole and the drainage cavity in sequence. When the hole plug 52 is installed in the through hole, rainwater is intercepted at the bottom of the outer box 1.

[0052] After rainwater flows into the outer box 1, it is accumulated in the water storage chamber, and the water baffle 5 intercepts the silt in the rainwater in the water storage chamber. When oil-water separation is performed for a long time, the rainwater level in the water storage chamber is not lower than the top of the water baffle 5. By removing the outer box 1 as a whole and removing the water baffle 5, the silt in the rainwater can be flushed out at one time to avoid clogging the drainage pipes on the road. By installing the hole plug 52 on the water baffle 5, the hole plug 52 can be directly pulled out to discharge the water in the water storage chamber, avoiding the long-term accumulation of rainwater in the water storage chamber to produce odor.

[0053] Please combine Figure 5, which is a schematic diagram of the cavity structure in the outer box. The guide plate 4, the oil separator 3, the water baffle 5 and the oil adsorption mechanism 2 divide the inner cavity of the outer box 1 into an overflow chamber, an overflow channel, a water storage chamber, a drainage channel and a drainage chamber. The overflow chamber is located above the guide plate 4. The overflow channel is located between the guide plate 4 and the oil adsorption mechanism 2 and the oil separator 3. The drainage chamber is located between the water baffle 5 and the inner wall of the outer box 1 on one side including the drainage port 11. The water storage chamber is located directly below the oil adsorption mechanism 2. The drainage channel is located between the oil adsorption mechanism 2, the oil separator 3 and the water baffle 5. The bottom of the overflow chamber is connected to one end of the overflow channel, and the other end of the overflow channel is connected to the drainage chamber. The water storage chamber is connected to the overflow channel through the oil adsorption mechanism 2. The water storage chamber is connected to the bottom of the drainage channel, and the top of the drainage channel is connected to the drainage chamber.

[0054] The working process of the oil-water separation device of this embodiment is as follows: the oily rainwater converges on the guide plate 4, and then flows into the water storage chamber through the oil adsorption mechanism 2. The oily rainwater accumulates in the water storage chamber, and the solid impurities such as mud and sand in the rainwater directly settle at the bottom of the water storage chamber, and the solid impurities are always blocked in the water storage chamber by the water retaining plate 5. When the rainwater liquid level is higher than the bottom surface of the oil adsorption mechanism 2 and lower than the top surface of the water retaining plate 5, the oil adsorption mechanism 2 can absorb the oil in the rainwater, and the rainwater is intercepted in the water storage chamber.

[0055] When the liquid level of the oily rainwater is higher than the top surface of the water retaining plate 5 and lower than the top surface of the oil separator 3, the oily dirt adsorption mechanism 2 adsorbs the oily dirt in the oily rainwater, and the oily rainwater after oil absorption flows into the drainage cavity from the drainage channel. When the liquid level of the oily rainwater is higher than the top surface of the oil separator 3, the oily rainwater is stratified in the overflow cavity to form an oil layer and a water layer higher than the bottom of the guide plate 4, and the oil layer is intercepted by the guide plate 4 in the overflow cavity. A part of the water layer flows into the drainage cavity through the oily dirt adsorption mechanism 2, the water storage cavity, and the drainage channel in sequence, and the other part flows into the drainage cavity through the overflow cavity.

[0056] In actual application, road rainwater flows from the road into the outer box 1, and then flows through the guide plate 4 into the oil adsorption mechanism 2, and then settles in the water storage chamber. When the flow rate of road rainwater is less than the processing capacity of the oil adsorption mechanism 2, the rainwater level in the outer box 1 is always lower than the top surface of the oil adsorption mechanism 2, and the oil in the rainwater is fully adsorbed by the oil adsorption mechanism 2. The rainwater is sufficient to meet the discharge standard and is discharged into the drainage pipe through the drain port 11. When the flow rate of road rainwater is greater than the processing capacity of the oil adsorption mechanism 2, the rainwater gradually accumulates in the outer box 1 until the rainwater level is higher than the top surface of the oil separator 3. Part of the rainwater still flows into the drainage chamber through the oil adsorption mechanism 2, the water storage chamber, and the drainage channel in turn, and the other part of the rainwater is directly discharged into the drainage chamber through the overflow channel to maximize the drainage rate, avoid clogging of the rainwater outlet, and maintain smooth discharge of road rainwater.

[0057] The oil-water separation device provided in this embodiment, when the flow rate of rainwater on the road is low, completely absorbs oil and settles the rainwater to separate the oil in the rainwater from other liquids, and accumulates the sediment in the rainwater in the water storage chamber, thereby preventing the oil or sediment in the rainwater from clogging the drainage pipes or other filtering devices, and maintaining the smooth discharge of rainwater. When the flow rate of rainwater on the road is high, the rainwater accumulates in the overflow chamber, and then converts from turbulent flow to laminar flow. Among them, the oil in the rainwater is at the top layer, higher than the bottom of the guide plate 4, and the oil is completely intercepted in the overflow chamber, and the sediment in the rainwater continues to accumulate at the bottom of the sewer outlet, thereby maintaining the drainage rate while separating the oil and sediment from the rainwater, avoiding clogging the drainage pipes or other filtering devices, and achieving smooth discharge of rainwater.

[0058] If the distance between the guide plate 4 and the oil adsorption mechanism 2 is too large, when the rainwater flow rate is high, after the rainwater is stratified in the overflow chamber, the oil layer may be lower than the guide plate 4, and part of the oil will overflow upward along the bottom surface of the guide plate 4 and flow into the drainage chamber through the overflow channel, resulting in incomplete oil treatment. If the distance between the guide plate 4 and the oil adsorption mechanism 2 is too small, when the rainwater flow rate is high, the rainwater cannot be discharged through the overflow channel in time, causing the drainage port 11 to be blocked. Therefore, it is necessary to adjust the height of the guide plate 4 according to the rainwater treatment requirements of each drainage port 11 to achieve a balance between oil removal and smooth drainage.

[0059] The guide plate 4, the water baffle 5, the oil separator 3, the guide rail 1 41, the guide rail 2 51 and the outer box 1 can all be made of plastic parts, ceramic parts, metal parts or wooden parts treated with paint, etc., as long as they have a certain hardness and corrosion resistance to meet the treatment requirements of oily rainwater. In this embodiment, the guide plate 4, the water baffle 5, the oil separator 3, the guide rail 1 41, the guide rail 2 51 and the outer box 1 are all made of resin concrete material, which not only reduces the manufacturing cost, but also has high corrosion resistance, and can extend the service life of the oil-water separation device.

[0060] The grille 6 is installed at the top of the outer box 1 to filter solid pollutants in the road rainwater whose particle size is larger than the holes of the grille 6. The shape of the grille 6 matches the opening of the outer box 1, and can be a square grid or a circular grid. The grille 6 can be a metal part, a wooden part, or a plastic part. In this embodiment, a ductile iron grille with waist-shaped holes with a mesh aperture of 210mm×25mm is used. The ductile iron grille has a high hardness and can meet the load-bearing requirements of the road. Of course, in other embodiments, the grille 6 can also be made of other materials, and the pores of the grille 6 can also be larger or smaller.

[0061] At least one handle may also be provided on the grille 6. The handle is provided on the edge of the grille 6. The top surface of the handle is not higher than the top surface of the outer box 1. The overall weight of the ductile iron grille is large. When the grille 6 is installed on the outer box 1 or on the rainwater outlet, it is difficult to directly remove the grille 6. In this embodiment, two handles are provided on the narrower side edges of the grille 6, and the handles are provided outside the pores to avoid interference with the flow of rainwater and facilitate the installation or removal of the grille 6.

[0062] In practical applications, the outer box 1 can be set to different specifications according to the diameter of the drainage outlet 11 in the road, and the guide plate 4, oil separator 3, oil adsorption mechanism 2 and water retaining plate 5 can be adaptively designed according to the specifications of the outer box 1 to meet the needs of rapid assembly of the oil-water separation device, thereby improving the convenience of installation of the oil-water separation device and improving the installation or disassembly efficiency of the oil-water separation device.

[0063] The oil-water separation device of this embodiment can be used in conjunction with the rainwater outlets of urban roads to form a network-type rainwater treatment system. The size and materials of the oil-water separation device meet the installation requirements of the rainwater outlets. The on-site installation is convenient and flexible, and the maintenance is convenient. No additional power is required to operate, which can reduce the operating cost. The oil-water separation device can intercept the initial rainwater oil pollution and reduce the pollution of road rainwater runoff. It has the functional characteristics of overflow, interception of rainwater oil pollution, pollution reduction, load-bearing performance, convenient installation, long life, corrosion resistance, and one-time molding.

[0064] Example 2

[0065] Different from the first embodiment, in the present embodiment, the oil-water separation device does not use the outer box 1, and the guide plate 4, the oil separator 3, the oil adsorption mechanism 2 and the water retaining plate 5 are directly installed in the rainwater outlet of the road. The rainwater outlet replaces the outer box 1 to realize the installation structure between the components in the first embodiment, which can reduce the installation materials and reduce the manufacturing cost.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An oil-water separation device based on non-point source pollution, which is arranged in the rainwater outlet of the road, and is used to absorb oil pollution in the rainwater on the road and separate the sediment in the rainwater to keep the sewer drainage smooth; the oil-water separation device includes an outer box, characterized in that, A drainage port is provided at the bottom end of the side wall of the outer box; The oil-water separation device also includes: An oil-stain adsorption mechanism is detachably mounted on the inner wall of the outer box away from the drain port; the oil-stain adsorption mechanism comprises a plurality of oil-absorbing plates; the plurality of oil-absorbing plates are fixedly connected to form a grid-like structure, and the grid-like structure comprises a plurality of water flow channels extending vertically; the oil-absorbing plates are used to absorb oil in rainwater; An oil separator, which is an inverted U-shaped plate; the oil separator opens downward, and the bottom end of one side of the oil separator is detachably connected to the end of the oil adsorption mechanism close to the drain outlet; the other side of the oil separator is close to but does not contact the inner wall of one side of the outer box containing the drain outlet; A guide plate, one end of which is fixedly connected to the inner wall of the outer box containing the drain port; the other end of the guide plate is arranged to be inclined downward and does not contact the inner wall of the outer box; the bottom end of the guide plate is higher than the top surface of the oil adsorption mechanism and lower than the top surface of the oil separator; and A water baffle plate is vertically arranged in the outer box; the water baffle plate is located directly below the oil separator; the top of the water baffle plate is lower than the top surface of the oil adsorption mechanism and the top of the water baffle plate is higher than the bottom surface of the oil adsorption mechanism; The guide plate, the oil separator, the water baffle and the oil adsorption mechanism divide the inner cavity of the outer box into an overflow chamber, an overflow channel, a water storage chamber, a drainage channel and a drainage chamber; the overflow chamber is located above the guide plate; the overflow channel is located between the guide plate and the oil adsorption mechanism and the oil separator; the drainage chamber is located between the water baffle and the inner wall of the outer box on one side including the drainage port; the water storage chamber is located directly below the oil adsorption mechanism; the drainage channel is located between the oil adsorption mechanism, the oil separator and the water baffle; the bottom of the overflow chamber is connected to one end of the overflow channel; the other end of the overflow channel is connected to the drainage chamber; the water storage chamber is connected to the overflow channel through the oil adsorption mechanism; the water storage chamber is connected to the bottom of the drainage channel; the top of the drainage channel is connected to the drainage chamber; The guide plate is a straight plate or a "7" plate; two guide rails 1 for mounting the guide plate are arranged opposite to each other on the inner wall of the outer box; the two guide rails 1 are vertically mounted on the inner wall of the outer box on one side including the drain port; The oil-water separation device also includes a grille; the grille is installed at the top of the outer box and is used to filter solid pollutants in road rainwater whose particle size is larger than the grille holes; The working process of the oil-water separation device is as follows: the oily rainwater converges on the guide plate, and then flows into the water storage chamber through the oil adsorption mechanism; when the liquid level of the oily rainwater is higher than the top surface of the water baffle and lower than the top surface of the oil separator, the oil adsorption mechanism adsorbs the oil in the oily rainwater, and the oily rainwater after oil absorption flows into the drainage chamber from the drainage channel; when the liquid level of the oily rainwater is higher than the top surface of the oil separator, the oily rainwater is stratified in the overflow chamber to form an oil layer and a water layer higher than the bottom end of the guide plate, and the oil layer is intercepted by the guide plate in the overflow chamber; a part of the water layer flows into the drainage chamber through the oil adsorption mechanism, the water storage chamber, and the drainage channel in sequence, and the other part flows into the drainage chamber through the overflow chamber; Wherein, the oil absorption plate comprises a substrate and an oil absorption layer; the oil absorption layer is coated on the substrate; the oil absorption layer is oleophilic and hydrophobic oil absorption cotton.

2. The oil-water separation device based on non-point source pollution according to claim 1 is characterized in that: At least two sliding blocks are fixedly connected to the outer wall of the oil adsorption mechanism; and sliding grooves for the sliding blocks to be lifted and lowered are provided on the inner wall of the outer box.

3. The oil-water separation device based on non-point source pollution according to claim 1 is characterized in that: When the guide plate is a "7"-shaped plate, one side of the guide plate is in contact with the inner wall of the outer box including the drain port.

4. The oil-water separation device based on non-point source pollution according to claim 1, characterized in that: Two guide rails 2 for installing the water baffle are arranged oppositely on the inner wall of the outer box; the two guide rails 2 are vertically installed on the inner wall of the outer box.

5. The oil-water separation device based on non-point source pollution according to claim 4 is characterized in that: A through hole is formed at the bottom end of the water baffle plate, and a hole plug is installed on the through hole.

6. The oil-water separation device based on non-point source pollution according to claim 4 is characterized in that: The outer edge of the water baffle is fixedly connected with a sealing gasket; when the water baffle is lowered along the second guide rail to fit with the bottom surface of the outer box, the sealing between the water baffle and the outer box is achieved through the sealing gasket.

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