Oil-water separation and purification system and oil-water separation and purification method used by same

Abstract

The invention relates to a staged oil-water separation treatment process for efficiently separating polluted water containing mixed water and oil and discharging the water and the oil to realize purification, and simultaneously guiding oil and water to flow by utilizing a natural fall way according to the oil-water separation treatment process. The invention relates to a system and an oil-water separation and purification method using the system. The present invention relates to an oil-water separation and purification system for separating and purifying water and oil mixed in oil and water, the oil-water separation and purification system comprising: an oil-water storage tank for receiving and storing inflowing oil and water; the supply pump is used for discharging and conveying the oil and water in the oil and water storage tank; the drum screen is used for receiving the oil water from the supply pump and carrying out first-stage pretreatment filtration on various types of sludge in the oil water; the scum removal device is used for carrying out second-stage pretreatment on the oil and water which are preliminarily filtered by the drum screen and carrying out bidirectional separation on residual sludge and the oil and water; the oil-water separator is used for carrying out water-oil two-way separation on the oil-water pretreated by the scum removal device, and purifying and discharging; the detection tank is used for detecting the turbidity of water separated and discharged from the oil-water separator; the drainage pump is connected to the bottom of the detection tank and used for discharging finally purified clear water into a sewer, water and oil in an oil-water mixture can be separated from each other and purified, and all treatment devices from the drum screen to the drainage pump are sequentially provided with height differences to form a stepped arrangement structure. Therefore, the whole flowing process of oil water from the drum screen to the detection groove can be automatically guided in a natural gravity falling mode.

Description

Technical Field

[0001] This invention relates to an oil-water separation and purification system and the oil-water separation and purification method used therein. The system provides a staged oil-water separation treatment process for polluted water containing a mixture of water and oil, which can efficiently separate and discharge water and oil to achieve purification. In addition, according to the oil-water separation treatment process, the oil and water flow is automatically guided by gravity, thereby improving the operating efficiency and realizing the automation of the process. Background Technology

[0002] Typically, an oil-water separator is a device used to separate oil and water. It can be used to separate industrial oil produced in various types of machinery, or to separate oil and water containing animal fats discharged from homes, restaurants, campsites, factories that process animal fats, etc.

[0003] If this mixture of oil and water (hereinafter referred to as "oil-water") is discharged directly without any purification treatment, it will cause serious damage to the natural ecosystem. In order to solve this problem, the oil-water must be collected and pretreated.

[0004] Currently, the main methods for separating water and oil from oil-water mixtures include gravity separation, hydraulic separation, and filtration separation.

[0005] Firstly, gravity separation involves allowing oil to float on the water surface, then using an oil skimmer to collect and remove it. For example, gravity separation allows oil and water to settle in a separation tank or flow slowly along multiple guide vanes, utilizing the difference in specific gravity between oil and water to collect the oil floating on the surface. Because gravity separation requires installation space and power for oil flotation and skimmer operation, it is typically only applicable to large facilities such as wastewater treatment plants where oil retention or slow flow is possible, and it also presents inherent inconveniences in maintenance and management.

[0006] Hydraulic separation is a method that uses centrifugal force and gravity to separate oil and water by creating predetermined flow patterns such as vortices within a confined space. However, hydraulic separation relies on sucking up and removing the floating oil from the upper layer, thus having the fundamental limitation of being unable to completely remove oil.

[0007] Filtration separation is a method that uses filter materials such as non-woven fabrics to trap grease while allowing water to pass through. However, when the oil content in the water is high, filtration separation may pose a risk of grease leakage, and because the filter needs to be replaced or cleaned regularly, it is difficult to achieve continuous oil-water treatment.

[0008] Especially for oil-water mixtures containing animal fats, the animal fats will solidify during the separation process, making it difficult to separate the fats smoothly. At the same time, the separated discharge points and the inner walls of the drain pipes are also prone to blockages due to the solidified animal fats.

[0009] In addition, animal fats that solidify on the inner walls of sewer pipes can rot and deteriorate, producing a foul odor and flowing back along the drain pipes, leading to secondary pollution and other problems.

[0010] The following section will introduce and analyze the advanced technologies for oil-water separation that have been publicly disclosed in recent years.

[0011] Utility Model No. 0432702 (Oil-Water Separator) discloses a structure comprising: a container body filled with a predetermined amount of water in its internal space; a partition disposed inside the container body, dividing the internal space into multiple partitions, wherein the lower end of the partition is spaced from the bottom surface of the container body, and the upper end is positioned above the water level to allow the filled water to circulate between the multiple internal spaces; a drainage section disposed on the wall of the container body where one of the multiple internal spaces is located, for maintaining a constant water level; an oil discharge section disposed on the wall of the container body where another of the multiple internal spaces is located, positioned higher than the drainage section; and an oil-water mixture supply section for supplying an oil-water mixture to one side of the internal space where the oil discharge section is located.

[0012] The aforementioned prior art uses a baffle structure, which guides water to the drain outlet on the outside of the baffle and discharges it, while oil that cannot pass through the baffle is discharged through the oil outlet. However, this structure is relatively simple. When the amount of oil and water flowing in increases sharply and the liquid level rises, the oil layer will form above the oil outlet, causing water to be discharged directly from the oil outlet. In addition, this structure cannot solve the problem of animal fats solidifying and clogging the oil outlet.

[0013] Utility Model No. 0442571 (Jug for Oil-Water Separation) discloses a structure comprising: a jug body having a predetermined height; a first spout protruding horizontally from the upper part of the jug body; and a second spout extending from the lower part of the jug body in a curved or oblique manner to a height lower than the outlet height of the first spout.

[0014] The existing technology uses a pot-shaped structure to achieve oil-water separation. Because the oil layer is located above the water and is designed to discharge along one side, overflow or difficulty in achieving oil-water separation can easily occur when the incoming oil and water are unstable. In addition, this technology cannot solve the problem of blockage of the oil outlet caused by the solidification of animal fats.

[0015] Patent No. 1270222 (oil-water separation device) discloses a structure in which a mechanism is provided to adjust the height of a plug that slides along the upper end of a vertical pipe, thereby effectively dealing with oil layers at different heights. However, the prior art only controls the separation state by adjusting the height of the plug, which is difficult to effectively deal with the oil layer position that changes with the water level. In addition, since animal fats can solidify, the adjustment of the plug's height may be hindered.

[0016] It is evident that existing oil-water separation devices have a drawback: because they must precisely align the oil level with the oil discharge point, when the incoming oil or water flow rate or velocity is high, the oil layer will fluctuate, resulting in the oil not being able to be separated and discharged separately, but being discharged together with the water.

[0017] In addition, although various systems such as oil-water separation systems for sludge and wastewater have been proposed, the infrastructure required for the phased purification process of these systems is extremely complex, and suitable oil-water separation and purification systems cannot be provided based on limited installation space, resulting in a number of problems such as reduced operating efficiency.

[0018] Therefore, there is an urgent need for a system and purification method that can provide a phased oil-water separation process based on site conditions. This system can not only efficiently separate and discharge water and oil, but also be customized according to the installation location of the infrastructure, thereby improving operational efficiency and oil-water separation and purification performance. Summary of the Invention

[0019] Technical problems to be solved The present invention is proposed in view of the aforementioned problems, and its purpose is to provide an oil-water separation and purification system that can provide a staged oil-water separation treatment process for polluted water containing a mixture of water and oil, thereby efficiently separating and discharging water and oil to achieve a purification effect.

[0020] Another objective of this invention is to provide an oil-water separation and purification system that can automatically guide the flow of oil and water according to the oil-water separation process and use natural gravity to fall, thereby improving operational efficiency and automating the process.

[0021] Another objective of this invention is to provide an oil-water separation and purification system that can be designed in stages according to the on-site installation space, adapts to different installation environments, ensures efficient separation and discharge of water and oil, and thus significantly improves the system's construction convenience and purification performance.

[0022] Another objective of this invention is to provide an oil-water separation and purification system that can be customized according to the zoning of on-site infrastructure, thereby improving operational efficiency and enhancing oil-water separation and purification performance.

[0023] Another objective of this invention is to provide an oil-water separation and purification method that can provide a phased oil-water separation and treatment process according to site conditions, which not only achieves efficient separation and discharge of water and oil, but also allows for customized construction based on the installation location of infrastructure, thereby further improving operational efficiency and oil-water separation and purification performance.

[0024] Technical solution To achieve the aforementioned objective, the present invention provides an oil-water separation and purification system for separating and purifying water and oil mixed in oil and water. The system includes: an oil-water storage tank for receiving and storing incoming oil and water; a supply pump for discharging and conveying the oil and water from the storage tank; a drum screen for receiving the oil and water from the supply pump and performing a first-stage pretreatment filtration of various sludge particles; a scum removal device for performing a second-stage pretreatment of the oil and water after preliminary filtration by the drum screen, separating residual sludge from the oil and water in both directions; an oil-water separator for performing bidirectional separation of water and oil in the oil and water after pretreatment by the scum removal device, and achieving purified discharge; a detection tank for detecting the turbidity of the water discharged from the oil-water separator; and a drainage pump connected to the bottom of the detection tank for discharging the finally purified water into a sewer. The processing equipment from the drum screen to the drainage pump is arranged with a height difference, forming a stepped layout, thereby automatically guiding the entire flow of oil and water from the drum screen to the detection tank by natural gravity.

[0025] In addition, the oil-water separation and purification system of the present invention further includes: an oil-water storage tank, which is set at a predetermined location underground or above ground, for receiving and storing oil-water mixture containing water and oil; and a raw material supply pump for pumping the oil-water mixture in the oil-water storage tank to the oil-water storage tank.

[0026] Furthermore, the oil-water separation and purification system of the present invention is configured such that the oil-water mixture containing water and oil can flow directly into the oil-water storage tank through a drain pipe. The system includes: a supply pump for discharging and conveying the oil-water in the oil-water storage tank; a drum screen for performing a first-stage sludge removal on the oil-water input by the supply pump; a scum removal device, at least one of which is installed for a second-stage removal of residual sludge supplied from the drum screen; and an oil-water separator for separating and purifying water and oil from the oil-water input by the scum removal device, wherein the water separated in the oil-water separator is bypassed and returned to the drain pipe via a recovery pump.

[0027] In addition, a scum storage tank may be further included, disposed between the drum screen and the scum removal device, for collecting and storing the sludge and scum separated and discharged from the drum screen and the scum removal device by means of a screw conveyor.

[0028] Furthermore, the rotary screen may include: a base frame; an inner cylinder installed inside the base frame, having a space for receiving filtered oily and sludge-containing water; a rotating drum body rotatably disposed on the upper part of the inner cylinder, using centrifugal force generated by rotation to filter out sludge from the oily and sludge; a rotating spiral with an oily and sludge inlet on one side, and equipped with a rotating mechanism that rotates synchronously with the rotating drum body to discharge the filtered sludge forward; a roller drive unit, consisting of a main roller and an auxiliary roller for linkage drive of the rotating drum body; a drive motor that transmits power to the main roller of the roller drive unit; and an air nozzle installed inside the inner cylinder for spraying airflow into the rotating drum body to remove residual sludge. When oily and sludge flow in from one side of the rotating spiral, the rotating drum body and the rotating spiral rotate synchronously. The oily and sludge flowing in through the oily and sludge inlet is filtered by the rotating spiral and discharged forward, while the filtered oily and sludge-free water is discharged to the outer periphery of the rotating drum body and collected in the inner cylinder.

[0029] In addition, the rotating drum body also includes an inner spiral, which can be composed of a cylindrical mesh structure spanning both ends. The mesh is arranged at predetermined equal intervals along the circumferential direction on the inner circumferential surface, forming multiple spiral protrusions corresponding to the rotating spiral blades.

[0030] The scum removal device may include: a support frame for installation on the ground; a shell body supported by the support frame, having an oil-water mixture containing water and scum entering from the bottom, and an inner and outer cylinder with a double-layer structure inside; an oil-water inlet pipe extending from the side of the shell body to the bottom for adding oil and water; a gas generator installed at the bottom of the shell body, supplying gas to the interior via a ring blower; a steam pipe installed inside the shell body for thermally decomposing the water and scum in the oil-water mixture; an auxiliary heating plate installed inside the shell body for reheating and decomposing the scum; a drain pipe connected to the central inner cylinder of the shell body for discharging purified water after filtration and heat treatment; a scum scraper installed at the top of the shell body, driven by a motor to rotate, for separating and discharging scum from the oil-water surface; and a scum outlet for discharging the scum separated by the scum scraper.

[0031] In addition, the scum removal device is described in which oil and water are introduced into the housing body through the oil and water inlet pipe. Under the action of bubbles generated by the gas generator and heat generated by the steam pipe, they are decomposed into water and scum. The floating scum is discharged to the scum outlet by the upper rotating scum scraper. At the same time, the purified water with the scum removed is purified and discharged through the drain pipe.

[0032] In addition, the inner cylinder of the shell body is provided with a through-hole on one side so that the drain pipe can be installed through it. At least two water flow holes are also formed vertically at the bottom of the inner cylinder near the bottom surface of the outer cylinder so that water can flow out from the outer cylinder.

[0033] In addition, the oil-water separator includes: a tank with a lid on top, forming a trough-like structure; an oil-water inlet located on one side of the tank for introducing a mixture of water and oil; a drain outlet located on the side opposite to the oil-water inlet for discharging the separated oil water; a first baffle located inside the tank near the oil-water inlet, extending vertically upward from the bottom of the tank to maintain a predetermined distance from the bottom surface of the tank, allowing the introduced oil-water to flow downward; a second baffle located inside the tank near the drain outlet, extending vertically upward from the bottom of the tank, allowing the separated oil water to flow from the bottom to the top; a third baffle located inside the tank near the drain outlet, installed vertically at a predetermined distance from the second baffle, allowing the rising water from the bottom to flow through; an oil baffle plate horizontally located at a predetermined height between the first and second baffle plates; an oil discharge section installed on the upper side of one side of the oil baffle plate, discharging only the floating oil; and a heating device located below the oil baffle plate for heating the incoming oil-water to a predetermined temperature.

[0034] In addition, the oil discharge section includes: a housing, which is threadedly installed on the upper side of the oil baffle; an oil discharge valve, which is disposed inside the housing, with a vertical inner diameter structure at the upper end and an inclined inner diameter structure at the lower end; a ball trap, which can flow freely within the oil discharge valve according to the oil discharge volume, and is used to realize the opening and closing operation of the valve; an anti-detachment mesh, which extends and is disposed in the lower part of the housing in a mesh shape, and is used to prevent the ball trap from falling off; and an oil discharge pipe, through which the oil discharge valve guides the oil to be discharged outward by the opening and closing action of the ball trap.

[0035] In addition, to achieve the above objectives, the present invention also provides an oil-water separation and purification method for separating water and oil mixed in external oil-water using the above-mentioned oil-water separation and purification system, which includes the following steps: an oil-water storage step, wherein the original oil-water mixture of water and oil is stored in an oil-water storage tank by supplying it. The process includes: an oil-water transport step, in which oil and water from the oil-water storage step are discharged and transported from the oil-water storage tank via a supply pump; a first-stage suspended solids removal step, in which the oil and water flowing in from the supply pump of the transport step undergoes a pretreatment of various suspended solids through a drum screen; a second-stage scum removal step, in which the oil and water supplied from the first-stage suspended solids removal step undergoes a bidirectional separation of residual suspended solids from the oil and water through a scum removal device, achieving secondary pretreatment; an oil-water separation and purification step, in which the oil and water flowing in from the second-stage scum removal step undergoes bidirectional separation of water and oil through an oil-water separator and is discharged; a detection step, in which the turbidity of the water separated and discharged in the oil-water separation and purification step is checked through a detection tank; and a purification and drainage step, in which the finally purified water is discharged into the sewer after the detection step is completed.

[0036] Furthermore, throughout the entire process from the oil-water storage step to the detection step, each processing device is arranged in a stepped manner with gradually decreasing height, so that the oil and water can be automatically guided to flow by natural gravity as they fall from the drum screen to the detection tank.

[0037] Beneficial effects This invention provides an oil-water separation and purification system that can provide a staged oil-water separation process in polluted water containing a mixture of water and oil, thereby efficiently separating and discharging water and oil to achieve purification.

[0038] Furthermore, the present invention can provide a phased oil-water separation process adapted to on-site installation areas to ensure efficient separation and discharge of water and oil in an oil-water separation and purification system.

[0039] This invention can also automatically guide the flow of oil and water according to the oil-water separation process and use natural gravity to fall, thereby improving work efficiency and realizing process automation.

[0040] Furthermore, this invention enables customized construction based on the specific infrastructure blocks on-site, thereby improving operational efficiency and oil-water separation and purification performance.

[0041] Furthermore, the present invention also provides an oil-water separation and purification method using the oil-water separation and purification system, which can provide a phased oil-water separation treatment process according to site conditions. It can not only efficiently separate and discharge water and oil, but also customize the construction according to the installation location of the infrastructure, thereby improving the operation efficiency and oil-water separation and purification performance. Attached Figure Description

[0042] Figures 1 to 10 This is a schematic diagram of an embodiment of the oil-water separation and purification system of the present invention.

[0043] Figure 1 This is a schematic diagram of the oil-water separation and purification system according to the present invention.

[0044] Figure 2 This is another installation diagram of the oil-water separation and purification system according to the present invention.

[0045] Figure 3 This is another installation schematic diagram of the oil-water separation and purification system according to the present invention.

[0046] Figure 4 The image shows the front view and plan view of the drum screen in the oil-water separation and purification system according to the present invention.

[0047] Figure 5 This is an exploded view of the scum removal device in the oil-water separation and purification system according to the present invention.

[0048] Figure 6 This is a side cross-sectional schematic diagram of the scum removal device according to the present invention.

[0049] Figure 7 for Figure 6 A schematic diagram of the other side of the scum removal device shown.

[0050] Figure 8 This is a schematic cross-sectional view of the oil-water separator in the oil-water separation and purification system according to the present invention.

[0051] Figure 9 for Figure 8 The diagram shows a cross-sectional view of a key part of the oil discharge section in the oil-water separator.

[0052] Figure 10 This is a schematic diagram of the process flow of the oil-water separation and purification method according to the present invention. Detailed Implementation

[0053] This invention can be modified in various ways and has multiple embodiments. Some embodiments will be illustrated with reference to the accompanying drawings and described in detail in the accompanying description. However, this does not mean that the invention is limited to the predetermined implementation form, but should be understood to include all modifications, equivalents, and substitutions that fall within the scope of the inventive concept and technology.

[0054] This invention is not limited to the embodiments disclosed below, and can be implemented in many different forms. The above embodiments are provided only to make the disclosure of this invention complete and to enable those skilled in the art to fully understand the scope of this invention.

[0055] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, when labeling components in the drawings with reference numerals, care should be taken to use the same reference numerals for the same components, even if they appear in different drawings. Furthermore, in describing the present invention, specific descriptions of known components or functions that are considered potentially obscuring the essence of the invention may be omitted.

[0056] The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments shown in the accompanying drawings.

[0057] Furthermore, the terms or words used in this specification and claims are for describing predetermined embodiments only and are not intended to limit the invention.

[0058] For example, singular expressions should include plural expressions in the text unless the context clearly indicates a different meaning. Furthermore, terms such as “comprising,” “possessing,” or “having” are intended to indicate the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, and should not be construed as pre-excluding the possibility of the presence of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0059] Furthermore, when the specification mentions that a layer, membrane, region, plate, or other part is located "above" another part, this expression includes not only the case where it is located "directly above" another part, but also the case where there are other parts in between. Conversely, when the specification mentions that a layer, membrane, region, plate, or other part is located "below" another part, this expression includes not only the case where it is located "directly below" another part, but also the case where there are other parts in between.

[0060] In addition, the ordinal terms such as "the first" and "the second" used in this specification may be used to describe a variety of components, but the aforementioned components are not limited by such terms, and such terms are only used to distinguish one component from other components.

[0061] The following detailed description of an embodiment of the present invention is provided in conjunction with the accompanying drawings, wherein the same components are referred to by the same reference numerals, and for clarity, the different parts are mainly described, avoiding repetition as much as possible.

[0062] Figures 1 to 6 An embodiment of the oil-water separation and purification system described in this invention is shown.

[0063] Reference Figures 1 to 6The present invention discloses an oil-water separation and purification system for separating and purifying water and oil mixed in oil and water. The system includes: an oil-water storage tank 100 for storing incoming oil and water; a supply pump 200 for discharging and conveying the oil and water from the oil-water storage tank 100; a drum screen 300 for receiving the oil and water from the supply pump 200 and performing a first-stage pretreatment filtration of various sludge particles; a scum removal device 400 for performing a second-stage pretreatment of the oil and water after preliminary filtration by the drum screen 300, separating residual sludge from the oil and water in both directions; an oil-water separator 500 for performing bidirectional separation of water and oil in the oil and water after pretreatment by the scum removal device 400, and achieving purified discharge; a detection tank 600 for detecting the turbidity of the water discharged from the oil-water separator 500; and a drain pump 700 connected to the bottom of the detection tank 600 for discharging the finally purified water into the sewer.

[0064] Preferably, the processing equipment from the drum screen 300 to the drainage pump 700 is arranged with a height difference P, forming a stepped arrangement structure, so that the entire flow process of oil and water from the drum screen 300 to the detection tank 600 can be automatically guided by natural gravity.

[0065] The oil-water storage tank 100 is a box-shaped shell structure used to store incoming oil and water. Its bottom is provided with an inclined surface R to facilitate the smooth discharge and transportation of oil and water.

[0066] On the other hand, such as Figure 2 As shown, the oil-water storage tank 100 of the present invention further includes: an oil-water reservoir 1199, which is disposed at a predetermined location underground or above ground, for receiving and storing oil-water mixture containing water and oil; and a raw material supply pump 1200, for pumping the oil-water mixture in the oil-water reservoir 1100 to the oil-water storage tank 100.

[0067] On the other hand, refer to Figure 3 The oil-water mixture, consisting of water and oil, can flow directly into the oil-water storage tank 100 through a drain pipe. It includes: a supply pump 200 for discharging and transporting the oil-water mixture from the storage tank 100; a drum screen 300 for first-stage sludge removal of the oil-water mixture input by the supply pump 200; a scum removal device 400, equipped with at least one, for second-stage removal of residual sludge supplied from the drum screen 300; and an oil-water separator 500 for separating and purifying water and oil from the oil-water mixture input by the scum removal device 400, wherein the water separated in the oil-water separator 500 is bypassed by a recovery pump 1300 and returned to the drain pipe 10.

[0068] At this point, the raw oil and water stored underground or on the ground and flowing directly in can be pumped by the raw oil supply pump 1200 and transported to the oil and water storage tank 100. The layout can be divided into zones according to the site with large oil and water discharge or the installation conditions of a large-scale site. Alternatively, the oil and water supplied directly from the sewage pipe along the sewage pipe line can be bypassed to the sewage pipe through the final recovery pump 1300, and the above process can be repeated to match the input capacity with the oil and water purification performance.

[0069] On the other hand, a scum storage tank 1400 can be provided between the drum screen 300 and the scum removal device 400 for collecting and storing the impurities and scum separated and discharged from the drum screen 300 and the scum removal device 400 by a screw conveyor 1410.

[0070] The supply pump 200 is a device that pumps oil and water from the oil-water storage tank 100 to the drum screen 300. It adopts a motor pump structure and is installed at the same height as the bottom of the oil-water storage tank 100, and can be set at the same height as or lower than the drum screen 300. When the supply pump is installed at the same height as the drum screen 300, it provides conditions for the oil and water to fall freely from the oil-water storage tank.

[0071] The drum screen 300 may include: a base frame 310; an inner cylinder 320, installed inside the base frame 310, having a space for receiving filtered sludge-containing oil and water; a rotating drum body 330, rotatably disposed on the upper part of the inner cylinder 320, using the centrifugal force generated by rotation to filter out sludge from the oil and water; a rotating spiral 340, having an oil and water intake port 341 on one side, and equipped with a rotating mechanism that rotates synchronously with the rotating drum body 330, used to discharge the filtered sludge forward; a roller drive unit 350, consisting of a main roller and an auxiliary roller of the rotating drum body 330 for linkage drive; a drive motor 360, transmitting power to the main roller of the roller drive unit 350; and an air nozzle 380, installed inside the inner cylinder 320, used to spray airflow into the rotating drum body 330 to remove residual sludge.

[0072] At this time, when oil and water flow in from one side of the rotating spiral 340, the rotating drum 330 rotates synchronously with the rotating spiral 340. The oil and water flowing in through the oil and water inlet 341 are filtered by the rotating spiral and the sludge is discharged forward. The oil and water that has been filtered to remove the sludge is discharged to the outer periphery of the rotating drum 330 and collected in the inner cylinder 320.

[0073] In addition, the rotating drum body 330 also includes an inner spiral 332, which can be composed of a cylindrical mesh structure 331 spanning both ends. The inner circumferential surface of the mesh 331 is equidistantly arranged along the circumferential direction to form a plurality of spiral protrusions corresponding to the rotating spiral blades.

[0074] The scum removal device 400 may include: a support frame 410 for installation on the ground; a housing body 420 supported by the support frame 410, having an oil-water mixture containing water and scum entering from the bottom, and having an inner cylinder 421 and an outer cylinder 423 with a double-layer structure inside; an oil-water inlet pipe 430 extending from the side of the housing body 420 into the bottom for adding oil and water; a gas generator 440 installed at the bottom of the housing body 420, supplying gas to the interior via a ring blower; and a steam pipe 450 installed on the housing body 420. The interior of the shell body 420 is used for thermal decomposition of water and scum in the oil-water mixture; the auxiliary heating plate 460 is installed inside the shell body 420 and is used for reheating and decomposing the scum; the drain pipe 470 is connected to the central inner cylinder 423 of the shell body 420 and is used to discharge the purified water after filtration and heat treatment; the scum scraper 480 is installed on the upper part of the shell body 420 and is driven by a motor to rotate, and is used to separate and discharge scum from the oil-water surface; the scum discharge port 490 is used to discharge the scum separated by the scum scraper 480.

[0075] Furthermore, the inner cylinder 423 within the shell body 420 has a pipe connection hole 423a on one side for penetrating the drain pipe 470, and the inner cylinder 423 has at least two vertically penetrating water flow holes 423b on its bottom surface near the bottom of the inner cylinder 421 for allowing water to flow through the inner cylinder. Water flowing in through the water flow holes 423b causes the water separated from the scum to rise from the bottom and overflow at a predetermined height, then be discharged through the drain pipe 470. That is, a system is provided where scum is filtered and discharged from the top, while water flows through the bottom of the inner cylinder to the drain pipe for discharge, achieving a binary separation and discharge of scum and water.

[0076] Preferably, in the scum removal device 400, oil and water enter the shell body 420 through the oil and water inlet 430. Under the action of the bubbles generated by the gas generator 440 and the heat generated by the steam pipe 450, they are decomposed into water and scum. The floating scum is discharged to the scum outlet 490 by the upper rotating scraper 480. At the same time, the purified water with the scum removed is discharged through the drain pipe 470.

[0077] The scum scraping device 480, as a rotating operating device installed on the upper part of the shell body 420, driven by a motor, separates scum from the surface of the float and discharges scum through the scum discharge port 490, and may include: a support plate 481 installed on the upper part of the shell body 420; a drive motor 482 disposed on one side of the support plate 481; a drive shaft 483 connected to the drive motor 482; a rotating shaft 485 linked to the drive shaft 483, installed on the upper part of the shell body 420 and used for rotating and filtering the floating scum; a guide rotating rod 486 laterally connected to the rotating shaft 485; rotating rollers 487 installed at both ends of the guide rotating rod 486 and guiding rotation along the upper periphery of the shell body 420 along the rotation radius; and a scum scraping plate 489 connected to the lower end of the guide rotating rod 486 for removing floating scum.

[0078] At this time, the support plate 481 can be assembled in the horizontal and vertical directions respectively, and can be fixedly installed on the upper periphery or side of the housing body 420 by bolts.

[0079] In addition, a bevel gear structure can be used to achieve smooth gear operation between the drive shaft 483 and the rotating shaft 485.

[0080] In addition, various electronic control devices for motor drive can be installed on the support plate 481.

[0081] Preferably, the support plate 481 can be covered with a cover plate to provide protection.

[0082] In addition, the scum scraping plate 489 is provided with a height adjustment device (not shown) at the lower end to adjust the height of the scum scraping plate 489 according to the height of the water surface where the scum is located, thereby realizing that the height of the scum can be adjusted according to the water surface height.

[0083] On the other hand, the drive motor 482, drive shaft 483 and rotating shaft 485 can be configured to rotate on the same axis in the vertical direction.

[0084] The oil-water separator 500 is topped with a cover and may include: a trough-shaped housing 510 with an oil-water inlet 511 on one side for placing a mixture of oil and water, and a drain outlet 513 on the opposite side for discharging water after oil separation; a handle filter 520 installed near the oil-water inlet 511 of the housing 510 for filtering foreign matter flowing into the oil-water mixture; a first partition 530 disposed inside the housing 510, near the oil-water inlet 511, and installed perpendicular to the bottom of the housing 510 at a predetermined distance from the bottom, allowing the added oil-water mixture to flow from the top to the bottom; and a second partition 550 disposed inside the housing 510. A third baffle 560 is installed near the drain outlet 513 and perpendicular to the bottom of the tank at a predetermined distance from the bottom, so that the water after oil separation can flow from the bottom to the top; a third baffle 560 is set inside the tank 510 near the drain outlet 513 and is installed vertically with a predetermined gap from the second baffle 550 so that the water at the bottom can overflow; an oil baffle 570 is horizontally set at a predetermined height between the first baffle 530 and the second baffle 550; an oil drain section 580 is installed on the upper part of one side of the oil baffle 570 and is only used to drain the floating oil; and a heating device 590 is installed below the oil baffle 570 and is used to heat the added oil and water to a predetermined temperature.

[0085] In addition, the bottom of the box 510 can be provided as an inclined surface 511, so that residual impurities accumulated at the bottom can be discharged naturally through the valve.

[0086] The handle filter 520 has a box-shaped mesh structure, including: a handle 523 located at the top for holding when removing foreign objects; and a protective cover 525, which is also provided on the upper part of the handle 523 to prevent oil and water from splashing from the top due to sudden oil and water flow.

[0087] In addition, the oil baffle 570 can be configured to be inclined toward the oil discharge section 580 so that the floating oil flows in a concentrated manner toward the oil discharge port.

[0088] The oil discharge section 580 may include: a housing 581, threadedly mounted on the upper side of the oil baffle 570; an oil discharge valve 583, disposed within the housing 581, having a vertical inner diameter 583a structure at the upper end and an inclined inner diameter 583b structure at the lower end; a ball trap 585, movably disposed at the lower end of the oil discharge valve 583 according to the oil discharge volume, for realizing the valve's opening and closing operation; an anti-detachment net 587, extending from the lower part of the housing 581 in a mesh shape, for preventing the ball trap from falling off; and an oil discharge port 589, through which the oil discharge valve 583 guides the oil to be discharged outward via the opening and closing action of the ball trap 585.

[0089] The anti-detachment net 587 can be in the form of a metal mesh or a mesh structure, and only needs to be a structure and form that can ensure the free flow of oil and water and prevent the ball trap from falling off.

[0090] On the other hand, the heating device 590 is located below the oil baffle 570 and near the first partition 530. It is used to heat the added oil and water to a predetermined temperature and maintain that temperature to prevent the animal fat from solidifying and to prevent the oil discharge from becoming blocked. The heating device can be driven by an external power source and can be a heating lamp or a heating tube. It can also be a single heating lamp, a single heating tube, or a combination of a heating lamp and a heating tube.

[0091] The effects of the oil-water separation and purification system according to the present invention, and the oil-water separation and purification method implemented using the purification system, will be described below. The following description is based on the foregoing structural content.

[0092] This invention provides an oil-water separation and purification method that uses an oil-water separation and purification system to separate the water and oil mixed in wastewater flowing in from the outside.

[0093] The oil-water separation and purification method according to the present invention may include: an oil-water storage step S100; an oil-water transportation step S200; a first suspended solids removal step S300; a second scum removal step S400; an oil-water separation and purification step S500; an inspection step S600; and a purification drainage step S700. [Oil-water storage procedure] The original mixture of water and oil is stored in the oil-water storage tank 100 by supplying it.

[0094] [Oil-Water Transfer Steps] The oil and water from the oil and water storage tank 100 in the oil and water storage step S100 are discharged and transported by the supply pump 200 in S200.

[0095] [First step in removing suspended solids] In the oil-water transfer step S200, the oil and water added by the supply pump 200 are pre-treated by the drum screen 300 to remove various suspended solids for the first time S300.

[0096] [Second step of scum removal] In the first suspended solids removal step S300, the oil and water are conveyed through the scum removal device 400 to separate the residual suspended solids (scum) from the water, thereby performing a second pretreatment and removing the scum S400.

[0097] Oil-water separation and purification steps The oil and water flowing in from the second scum removal step S400 pass through the oil-water separator 500, where the water and oil are separated and discharged separately, thus achieving oil-water separation and purification S500.

[0098] [Inspection Steps] Perform a turbidity test on the water discharged from the oil-water separation and purification step S500 S600.

[0099] [Purification and Drainage Steps] In the inspection step S600, the finally purified water is discharged into the sewer, thus completing the purification and drainage step S700.

[0100] First, in the oil-water storage step S100, the raw wastewater or treated water (oil-water) containing the mixture of water and oil flows in and is stored, and then directly enters the next process's moving stage to achieve the collection function.

[0101] Depending on the oil-water capacity, the process may further include the following steps: an oil-water storage tank 1100 for storing the mixture of water and oil is provided at a predetermined location underground or on the ground; and a raw material supply pump 1200 for pumping the oil and water in the oil-water storage tank 1100 to the oil-water storage tank 100.

[0102] Subsequently, in the oil-water transfer step S200, the oil and water are transferred to the drum screen 300 using the supply pump 200.

[0103] Next, in the first suspended solids removal step S300, oil and water conveyed by the drum screen 300 are received to perform the first pretreatment filtration of foreign matter and sludge in the oil and water.

[0104] Then, in the second scum removal step S400, the oil and water after the first pretreatment are received by the scum removal device 400 for a second pretreatment filtration. At this time, depending on the volume of the inflowing oil and water, the scum removal device 400 can adopt a parallel or series structure of the first scum removal device 400A and the second scum removal device 400B, and be installed in parallel to enhance the processing capacity.

[0105] Preferably, in the subsequent scum removal step, water and oil can be separated by gravity treatment and discharged separately.

[0106] Next, in the oil-water separation and purification step S500, the water-oil mixture after pretreatment from the scum removal step is received and pretreated again by the oil-water separator 500 using specific gravity and heat to separate the water and oil into two components and discharge them separately.

[0107] In this case, for sites with large daily oil and water discharge or large scale, the oil and water supplied directly from the sewer pipe can be circulated through the sewer pipe bypass by the final recovery pump 1300, so that the oil and water can repeatedly enter the treatment process, thereby improving the oil and water purification performance according to the added capacity.

[0108] Finally, only the turbidity of the final separated water is checked before it is discharged after purification.

[0109] Preferably, the installation height of each piece of equipment in the oil-water storage step to the inspection step can be lowered sequentially, so that the flow of oil and water from the drum screen to the inspection tank is automatically guided by natural drop.

[0110] As described above, the oil-water separation and purification system and method of the present invention, by providing a staged oil-water separation treatment process for mixed water and oil, can not only effectively separate and discharge water and oil to achieve a purification effect, but also provide a staged oil-water separation treatment process according to the on-site installation area, thereby improving the separation and discharge efficiency of water and oil. Furthermore, the present invention can automatically guide the flow of oil and water according to the oil-water separation treatment process, achieving flow through natural drop, thereby improving operational efficiency and realizing process automation.

[0111] This invention relates to a device with an independent oil discharge section capable of automatically separating grease and recovering over 99% of waste animal and vegetable oils from kitchens. In the discharged water, the content of animal and vegetable oils can be controlled below 20 mg / L, and the water content of the recovered grease is also less than 1%, exhibiting high purity and significant reuse value. According to the "Detailed Rules for the Implementation of the Sewerage Law," inlets for solid materials should be equipped with screens with an effective gap not exceeding 10 mm, while inlets for grease should be equipped with oil-blocking devices. According to the "Detailed Rules for the Implementation of the Water Environment Protection Law," the discharge limit for animal and vegetable oils in hexane extractables is 30 mg / L.

[0112] As described above, the present invention has been illustrated through preferred embodiments, but is not limited to these embodiments. Without departing from the spirit of the invention, various modifications and variations can be made by those skilled in the art within the scope of the technical concept of the invention and the equivalents of the claims described below.

[0113] In the picture: 100: Oil-water storage tank; 200: Supply pump; 300: Rotary drum screen; 310: Base frame; 320: Inner cylinder; 330: Rotating drum; 340: Rotating auger; 350: Roller drive unit; 360: Air nozzle; 400: Scum removal device; 410: Support frame; 420: Shell body; 430: Oil-water inlet pipe; 440: Gas generator; 450: Steam pipe; 460: Auxiliary heating plate; 470: Drain pipe; 480: Scum scraping device; 490: Scum discharge outlet; 500: Oil-water separator; 510: Box body; 520: Oil-water inlet; 530: Drain outlet; 540: First baffle; 550: Second baffle; 560: Third baffle; 570: Oil baffle; 580: Oil discharge section; 590: Heating device; 600: Detection tank; 700: Drain pump; 1100: Oil-water storage tank; 1200: Raw material supply pump; 1300: Recovery pump; 1400: Scum storage tank.

Claims

1. An oil-water separation and purification system, characterized in that, include: Oil and water storage tank, used to receive and store incoming oil and water; A supply pump is used to drain and transport the oil and water from the oil and water storage tank. A rotary screen receives oil and water from the supply pump and performs a first-stage pretreatment filtration on various types of sludge therein. The scum removal device performs a second-stage pretreatment on the oil and water that has been initially filtered by the drum screen, separating the residual sludge from the oil and water in both directions. The oil-water separator performs bidirectional separation of water and oil in the oil-water mixture after pretreatment by the scum removal device, and achieves purified discharge. A detection tank is used to detect the turbidity of the water discharged from the oil-water separator. as well as A drain pump, connected to the bottom of the testing tank, is used to discharge the final purified water into the sewer. The water and oil in the oil-water mixture can be separated and purified. The various treatment devices, from the drum screen to the drainage pump, are arranged with varying heights to form a stepped structure. This allows the oil and water to flow automatically from the drum screen to the testing tank, guided by gravity. The scum removal device may include: Supporting framework: For installation on the ground; the housing body, supported by the support frame, has an oil-water mixture containing water and scum entering from the bottom, and is provided with an inner cylinder and an outer cylinder with a double-layer structure inside; Oil and water inlet pipe: extends from the side of the housing body into the bottom for adding oil and water; A gas generator is installed at the bottom of the housing body and supplies gas to the interior through a ring blower; A steam pipe, installed inside the shell body, is used for the thermal decomposition of water and scum in the oil and water; An auxiliary heating plate is installed inside the shell body for reheating and decomposing the scum. Drain pipe: connected to the central inner cylinder of the shell body, used to discharge purified water after filtration and heat treatment; A scum scraper, installed on the upper part of the housing body, is driven by a motor to rotate and is used to separate and discharge scum from the oil-water surface; and The scum discharge port is used to discharge the scum separated by the scum scraper.

2. The oil-water separation and purification system according to claim 1, characterized in that, The drum screen includes: Base frame; The inner cylinder is installed inside the base frame and has a space for receiving filtered sludge and oily water. A rotating drum body is rotatably mounted on the upper part of the inner cylinder, and uses the centrifugal force generated by the rotation to filter out sludge from the oil and water; The rotating spiral has an oil and water suction port on one side and is equipped with a rotating drum that rotates synchronously with the rotating drum body to discharge the filtered sludge forward. The roller drive unit consists of a main roller and an auxiliary roller for linkage drive of the rotating drum body; The drive motor transmits power to the main roller of the roller drive unit; and An air nozzle, installed inside the inner cylinder, is used to spray airflow into the rotating drum to remove residual sludge. When oil and water flow in from one side of the rotating spiral, the rotating drum rotates synchronously with the rotating spiral. The oil and water flowing in through the oil and water inlet are filtered by the rotating spiral and the sludge is discharged forward. The oil and water that has been filtered to remove the sludge is discharged to the outer periphery of the rotating drum and collected in the inner cylinder.

3. The oil-water separation and purification system according to claim 1, characterized in that, The scum removal device is as follows: Oil and water are introduced into the housing body through the oil and water inlet pipe. Under the action of bubbles generated by the gas generator and heat generated by the steam pipe, they are decomposed into water and scum. The floating scum is discharged to the scum outlet by the upper rotating scum scraper. At the same time, the purified water with the scum removed is purified and discharged through the drain pipe.

4. The oil-water separation and purification system according to claim 1, characterized in that, In addition, the inner cylinder of the shell body is provided with a through-hole on one side so that the drain pipe can be installed through it. At least two water flow holes are also formed vertically at the bottom of the inner cylinder near the bottom surface of the outer cylinder so that water can flow out from the outer cylinder.

5. The oil-water separation and purification system according to claim 1, characterized in that, The oil-water separator includes: The box has a lid on top and has a trough-like structure. An oil-water inlet is located on one side of the tank and is used to introduce an oil-water mixture of water and oil. A drain outlet is located on the side opposite to the oil-water inlet, and is used to drain the water from which the oil has been separated. The first partition is located inside the box, near the oil and water inlet, and extends vertically upward from the bottom of the box to maintain a predetermined distance from the bottom surface of the box, so that the oil and water can flow downward through. The second partition is located inside the box, near the drain outlet, and extends vertically upward from the bottom of the box, allowing the water separated from the oil to flow from the bottom to the top. The third partition is installed inside the box, near the drain outlet, and is vertically installed at a predetermined distance from the second partition, so that the rising water from the bottom can flow through it. An oil baffle is horizontally positioned at a predetermined height between the first baffle and the second baffle; An oil drain section, installed on the upper side of one side of the oil baffle, only drains the oil that floats to the surface; and A heating device, located below the oil baffle, is used to heat the incoming oil and water to a predetermined temperature. The oil discharge section includes: The housing is threadedly installed on the upper side of the oil baffle. An oil discharge valve is installed inside the housing, with a vertical inner diameter structure at the upper end and an inclined inner diameter structure at the lower end; A ball trap, which can flow freely within the drain valve depending on the oil discharge rate, is used to enable the valve to open and close. An anti-detachment net, extending in a mesh shape at the lower part of the housing, is used to prevent the ball trap from falling off; The oil drain pipe and the oil drain valve guide the oil to be discharged outward through the opening and closing action of the ball trap.

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