KR102667437B1 - Apparatus for Separating Oil From Water - Google Patents

Abstract

This technology relates to an oil-water separation device that smoothly separates water and oil from inflowing wastewater in stages, stores them separately, and can perform a washing function in parallel when necessary. More specifically, the oil-water separation device is an oil-water separation device that separates water and oil from the inflowing wastewater and stores them separately. An oil-water separator that separates oil and water from wastewater flowing in from the outside multiple times through an oil-water separator that discharges the separated water to the outside through a discharge pipe, and an oil storage tank that individually stores the oil separated by the discharge pressure of the oil-water separator. Wherein the oil-water separator includes a first housing having a drain pipe formed at the bottom, a plurality of partition walls dividing the inside of the first housing into a plurality of spaces, a blocking plate formed in each space adjacent to the partition wall, and each other. A filter provided on the upper part of each partition so that neighboring spaces communicate with each other, and a plurality of pumps installed on the blocking plate to prevent flooding by wastewater flowing into each space, but discharging the oil separated by the difference in specific gravity into the oil storage tank. , Installed in each space, it is characterized by including a steam member that applies heat to prevent the oil separated due to the difference in specific gravity from solidifying and moves the oil in the direction of the filter.

Description

Oil-water separation device that separates oil and water at each stage {Apparatus for Separating Oil From Water}

This technology relates to an oil separation device that smoothly separates water and oil from inflowing wastewater in stages, stores them separately, and can also perform a washing function when necessary.

In general, incomplete combustion of fuel and evaporation of petroleum products, organic solvents and paints, as well as automobiles, petroleum refining and petrochemical manufacturing facilities, laundries, paint manufacturing facilities, printing ink manufacturing facilities, small-scale organic solvent use facilities, and road paving facilities. , Industrial facilities such as printing and various painting facilities generate oil and water mixed with various organic solvents, and various devices and methods have been developed and used to separate such oil and water.

Devices for separating oil and water into oil and water include equipment using an oil separator or vacuum pump, and other chemical separation accelerators are used.

However, equipment such as oil separators are not only complex but also expensive, and chemical separation accelerators have the problem of not completely separating oil and water.

Meanwhile, in order to overcome this problem, an oil-water separator that has a relatively simple structure and separates oil and water by using the difference in specific gravity has been developed and used. However, due to the limitation of separation based on the specific gravity of oil and water, not only is the recovery rate of oil low, but it is also unavoidable that oil still exists in the discharged water.

Therefore, there was a problem in that oil recovery efficiency was lowered and a lot of time and effort was required to purify the water separated from the oil when it was discharged.

Therefore, there has been a need to develop an oil-water separator that can accurately separate oil and water, and in particular, can smoothly store the separated waste oil and water separately.

Domestic registered patent No. 2210080 (announcement date: 2021.01.29.) Domestic registered patent No. 2237989 (announcement date: 2021.04.08.) Domestic registered patent No. 2217671 (announcement date: 2021.02.19.) Domestic registered patent No. 2314521 (announcement date: 2021.10.19.) Domestic registered patent No. 2236483 (announcement date: 2021.04.06.)

In order to solve the above-described conventional problems, the present invention is an oil-water separation device that quickly and accurately separates oil and water step by step using the difference in specific gravity from wastewater mixed with oil and water, and can store the separated oil and water separately. The purpose is to provide an oil-water separation device that can be cleaned internally.

As a means of solving the problem of solving the above-described conventional problems, the oil-water separation device for separating oil and water in stages according to the present invention is an oil-water separation device for separating water and oil mixed in wastewater flowing in from the outside. The separation device separates water and oil from wastewater flowing in from the outside through the inlet pipe 10 multiple times, and the oil-water separator 100 and the oily water discharge the separated water to the outside through the discharge pipe 20. It includes an oil storage tank 200 for individually storing oil separated by the discharge pressure of the separation unit 100, wherein the oil-water separation unit 100 includes a first housing 110 with a drain pipe 30 formed at the bottom, A plurality of partition walls 113 dividing the interior of the first housing 110 into a plurality of spaces 111, a blocking plate 115 formed in each space 111 adjacent to the partition walls 113, A filter 117 provided on the upper part of each partition 113 so that neighboring spaces 111 communicate with each other, and a filter 117 on the blocking plate 115 to prevent flooding by wastewater flowing into each space 111. A plurality of pumps 119 are installed to discharge the oil separated by the difference in specific gravity into the oil storage tank 200, and are installed in each space 111 to apply heat to prevent the oil separated by the difference in specific gravity from solidifying. It is characterized by including a steam member (120) that moves the oil in the direction of the filter (117).

In addition, the oil-water separator 100 further includes a cleaning member 130 for cleaning the bottom of the first housing 110, and the cleaning member 130 is in the shape of a pipe (PIPE) having a predetermined length. It is individually arranged in each space 111, and is formed in a plurality in the longitudinal direction of the washing water supply pipe 131 and the washing water supply pipe 131 connected to the washing water supply tank outside the first housing 110, with a predetermined discharge. It is desirable to include a nozzle 133 that sprays washing water under pressure.

In addition, the washing water supply pipe 131 is preferably installed in a plurality of configurations so as to have different heights and different longitudinal directions in each space 111.

In addition, the oil-water separation device is installed in front of the oil-water separation unit 100 and further includes a screen member 300 that preferentially separates foreign substances or water and oil contained in the wastewater flowing into the first housing 110. However, the screen member 300 has an inlet pipe 10 connected to one side and is formed to communicate with the first housing 110 on the other side, and a second housing 310 with a drain pipe 30 formed at the bottom, It is preferable to include a screen 320 to separate foreign substances or oil mixed in the wastewater discharged into the second housing 310.

In addition, the installation position of the steam member 120 is installed so that it can be submerged in the wastewater flowing into each space 111 to a predetermined depth, where the predetermined depth is 10 cm downward from the surface of the water separated from the oil. It is preferable that it is within 20 cm.

In addition, the oil-water separator 100 replaces the pump 119, which is individually installed in each space 111, and includes a scraper 140 that removes the oil separated by the difference in specific gravity and discharges it into the oil storage tank 200. It is further included, but the scraper 140 is preferably installed in the oil-water separation unit 100 into which wastewater initially flows.

In addition, the oil-water separation device further includes a preheating member 400 disposed in the oil-water separation unit 100 or the screen member 300 to preheat the wastewater, and the preheating member 400 is located in the oil-water separation unit 100. A preheating tank 410 is connected to (100) or the screen member 300 by a pipe and stores the inflowed wastewater, and is installed to be separable from the preheating tank 410 and heats the wastewater stored in the preheating tank 410. It includes a heating means 420, and the heating means 420 is preferably a heater that generates heat by applied power.

According to the present invention, unlike the prior art, oil and water are quickly and accurately separated step by step from wastewater mixed with oil and water through an oil-water separator using the difference in specific gravity, and the separated oil is separated into an oil storage tank by a pump. The effect that can be supplied and processed is satisfied.

In addition, unlike in the past, the inside of the first housing can be cleaned in an empty state where wastewater does not exist in the space after oil-water separation through a cleaning member provided in each space divided into multiple sections inside the oil-water separation unit. The effect of being able to carry out another oil-water separation process in a clean state is expected.

Figure 1 is a side view of an oil-water separation device for separating oil-water in stages according to the present invention.
Figure 2 is a plan view of Figure 1.
Figure 3 is a view showing the oil-water separation unit for Figure 1.
Figure 4 is a diagram illustrating the operational relationship of the screen member in Figure 1.
Figures 5 and 6 are diagrams showing the use state of the preheating member, which is another embodiment of the oil-water separation device for separating oil and water in each stage according to the present invention.
Figure 7 is a state diagram of the use of a scraper, which is another embodiment of the oil-water separation device for separating oil and water in stages according to the present invention.

Hereinafter, various embodiments will be described in more detail with reference to the attached drawings. The embodiments described herein may be modified in various ways. Specific embodiments may be depicted in the drawings and described in detail in the detailed description. However, the specific embodiments disclosed in the attached drawings are only intended to facilitate understanding of the various embodiments. Therefore, the technical idea is not limited to the specific embodiments disclosed in the attached drawings, and it should be understood that all equivalents or substitutes included in the spirit and technical scope of the invention are included.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the above-mentioned terms. The above-mentioned terms are used only for the purpose of distinguishing one component from another.

In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

In addition, when describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof is abbreviated or omitted.

Hereinafter, with reference to the attached drawings, the oil-water separation device (hereinafter briefly referred to as 'oil-water separation device') for separating oil and water in each stage according to the present invention will be described in detail.

First, as shown in FIGS. 1 to 3, the oil-water separation device 1 according to the present invention largely includes an oil-water separation unit 100, an oil storage tank 200, and a screen member 300, wherein the oil storage tank (200) refers to a configuration such as a tank that can temporarily store oil separated by the discharge pressure of each of the plurality of pumps 119, which will be described later. In order not to obscure the gist of the present invention, the oil Description of the structural features of the storage tank 200 will be omitted.

To explain in more detail, the oil-water separation unit 100 separates the wastewater flowing in from the outside into water (W) and oil (O) in a step-by-step sequence, and discharges the separated oil into the oil storage tank 200. It is a configuration for discharging water to the outside and enabling selective cleaning in the empty state where separation has been completed, and includes a first housing 110, a pump 119, a steam member 120, and a cleaning member 130. do.

For example, as shown, the first housing 110 may be entirely molded into the shape of an empty box to form a space 111 inside, and an inflow pipe 10 is formed on one side for the inflow of wastewater. , a discharge pipe 20 is formed on the other side to discharge the separated water.

Here, the space 111 has a structure in which the space is partitioned by a plurality of partition walls 113 adjacent to each other, thereby satisfying a structure in which running water is separated in stages by overflow from the inlet pipe 10 to the discharge pipe 20. I do it.

At this time, although not shown, the first housing 110 separates oil and water in stages in the space 111 where the inflowed wastewater is divided, and the inflow amount of the wastewater and the discharge amount after passing through the filter 117 are separated so that the wastewater can be moved by overflow. It is preferable that at least one flow rate controller (not shown) is installed to adjust this.

Meanwhile, the above-described first housing 110 is shown as a plurality of housings 110 connected to each other, but this is only one embodiment, and may be formed in the form of a tank if necessary. It is possible to form a plurality of partition walls 113 inside to form a space 111 divided into each other, and it is also possible to additionally provide an insulating material (not shown) on the wall for thermal insulation (see FIG. 8 ).

In addition, a cover (not shown) may be provided on the upper part of the first housing 110 to allow workers to enter and exit each space 111.

In addition, the pump 119 is disposed in each space 111 partitioned by the partition wall 113 to be located on the blocking plate 115 to prevent flooding by wastewater, and pumps oil located at the top of the water due to the difference in specific gravity. It is sucked in and forcefully discharged into the oil storage tank (200).

Here, as shown, the blocking plate 115 has a receiving space at the top where the pump 119 is accommodated, and an extension in the form of a plate is formed downward, and the lower end of the extension is inside the first housing 110. It is installed so that it can be spaced apart from the floor.

Therefore, the wastewater flowing into the space 111 has oil floating on the top of the water due to the difference in specific gravity, and is attached to the partition wall 113 due to the gap between the bottom of the blocking plate 115 and the bottom of the first housing 110. It has a structure in which water overflows and moves through the formed filter 117 to another space 111 adjacent to each other by the partition wall 113.

At this time, as shown, the pump 119 is arranged in a zigzag manner in each space 111, and after sufficient separation of the wastewater overflowing into each space 111 occurs, the first housing ( 110) It is desirable to satisfy a structure that can be discharged to the outside.

In addition, the pump 119 is not shown, but is capable of sucking in the oil through a pipe penetrating the blocking plate 115 so that only the oil floating on the top of the water in the space 111 can be forcibly sucked in from the input end. It has a structure that can be used, and the output end also satisfies the structure of being connected to the oil storage tank 200 through a pipe, etc.

Meanwhile, the filter 117 formed on the partition wall 113 discharges oil (including foreign substances) contained in water moving to the adjacent space 111 due to overflow, as well as discharged to the outside of the first housing 110. Oil that may be contained in water is removed by adsorption so that oil components are completely removed from the water discharged to the outside of the first housing 110.

For this purpose, the filter 117 is installed to be replaceable on the partition wall 113, and non-woven fabric or absorbent fabric for oil adsorption can be used.

In addition, the steam member 120 provides heat to prevent the water and separated oil from clumping or solidifying within each partitioned space 111, and at the same time allows the separated oil to move in the direction of the pump 119. It is a configuration that provides power.

For this purpose, the steam member 120 may be in the form of a pipe with a plurality of steam nozzles in the longitudinal direction or with a plurality of steam discharge holes formed on the outer surface, and is installed so that it can be submerged in wastewater to a predetermined depth.

The steam member 120 in the present invention has a pipe-connected structure with a steam provider (not shown) that provides high temperature steam, and if necessary, a steam nozzle or steam discharge is provided on the outer surface of the steam member 120. It may have a structure to prevent clogging of the ball, or it may have a structure that allows steam to be forcibly discharged at all times to prevent the inflow of wastewater into the steam member 120 when wastewater flows in.

At this time, the installation position of the steam member 120, which is individually installed in each space 111, is used so that it is submerged to a depth of about 10 cm or less based on the surface of the water separated by the difference in specific gravity, but the steam is discharged using the pump (119). ) It is desirable to have a structure in which it is discharged in the direction in which it was formed.

To elaborate, the wastewater flowing into the first housing 110 consists of a mixture of water and oil, and the thermal conductivity of the water is approximately 0.5918 W/(m·K), and the thermal conductivity of oil is approximately 0.100 W/(m·K). ) is generally scientific common sense that the heat rate of oil is almost twice that of water.

In the present invention, based on this scientific basis, the installation position of the steam member 120 that emits high-temperature steam is installed so that it can be submerged to a predetermined depth in water separated by a difference in specific gravity within the space 111.

In this state, when high-temperature steam is forcibly released in the form of air bubbles into the water separated from the oil, the water is heated by the temperature of the released steam, and this heated heat is transmitted through the oil existing on the surface of the water through heat conduction. It gets heated.

Then, the separated oil is heated by the heat conducted from the water and does not clump or solidify, but moves in the direction of the pump 119 by the discharge pressure of the steam to satisfy a structure that allows forcible suction by the pump 119. It will happen.

In addition, the cleaning member 130 is configured to cleanly clean the inside of the first housing 110 so that it can be used after separating the oil and water from the wastewater, and includes a cleaning water supply pipe 131 and a nozzle 133, The cleaning member 130 is individually installed in each of the plurality of partitioned spaces 111 so that all or individual operations can be performed.

As shown, the washing water supply pipe 131 has a lattice shape with different heights as well as horizontal and vertical directions adjacent to the inner bottom surface of the first housing 110 and the inner area of the first housing 110. It can be installed in large numbers and is connected to a washing water supply pipe (not shown) to receive the washing water necessary for cleaning.

A plurality of nozzles 133 may be arranged to face the bottom surface of the first housing 110 in the longitudinal direction of the washing water supply pipe 131, and the washing water supplied to the washing water supply pipe 131 is sprayed to the floor to have a predetermined discharge pressure. Allow the surface to be washed.

Here, the washing water used for washing has a structure in which it is discharged to the outside of the first housing 110 through a drain pipe 30 connected to a concentration tank (not shown).

In addition, the screen member 300 is disposed at the input end of the above-described first housing 110 where wastewater flows into the first housing 110 to preferentially separate water and oil as well as foreign substances contained in the wastewater flowing into the first housing 110. The configuration for this includes a second housing 310 and a screen 320.

Prior to explanation, the screen member 300 in the present invention is installed and used integrally with the first housing 110, as shown in FIG. 4, but this is only one embodiment. Note that, if necessary, it is possible to install and use adjacent to the inlet pipe 10 of the first housing 110 at a predetermined distance so that the pipe can be connected to the pipe.

For example, as shown, the second housing 310 is formed in the shape of a hollow enclosure, with an inlet pipe 10 formed on one outer surface to communicate with the inside, and the other side formed to communicate with the inside of the first housing 110. do.

A drain pipe 30 connected to the sludge storage tank 330 is formed in the lower part of the second housing 310 so that the sludge filtered through the second housing 310 flows into the sludge storage tank 330 through the drain pipe 30. It has a supply structure.

To this end, on the outer surface of the second housing 310, in addition to the drain pipe 30 described above, foreign matter (sludge) separated by the inlet pipe through which wastewater flows and the screen 320 is discharged and supplied to the sludge storage tank 330. A separate outlet pipe is formed, and for this purpose, the outlet pipe may be formed to communicate with the screen 320 through which foreign substances are filtered, as shown.

In addition, as shown, the screen 320 is installed to have a predetermined inclination angle so as to be replaceable inside the second housing 310, and in an embodiment, is of the same type as the filter 117 so as to absorb oil components. It can be molded using any material.

Therefore, foreign substances or water and oil contained in the wastewater flowing into the oil-water separator 100 through the screen member 300 are preferentially separated, and the wastewater primarily separated into the oil-water separator 100 is first separated. As the inflow structure is satisfied, the advantage of shortening the process time required for oil-water separation is expected, as well as the advantage of extending the replacement of the plurality of filters 117 provided in the oil-water separation unit 100.

On the other hand, as shown in FIGS. 5 and 6, the oil-water separation device 1 according to the present invention allows separation of oil-water from wastewater flowing into another embodiment of the oil-water separator 100 to be more easily implemented. It may include a preheating member 400 including a preheating tank 410 and a heating means 420 for preheating the wastewater.

For example, the preheating tank 410 may be molded in the shape of a tank with an open and closed top, and as shown, it may be used in combination with the first housing 110 on one side or in addition to the preheating tank 410. A screen member 300 may be additionally installed and used on the other side (see FIGS. 5 and 6).

The preheating tank 410 may also have an inlet pipe through which wastewater flows in and an outlet pipe through which foreign substances are discharged, formed on its outer surface in the same manner as the first housing 110 or the second housing 310 described above, and a drain pipe at the bottom. (30) is formed to have a structure that allows foreign substances settled in the lower part of the preheating tank 410 to be discharged.

At this time, although not shown, it is preferable that the preheating tank 410 is provided with a temperature sensor (not shown) to detect the temperature of the wastewater preheated by the heating means 420.

In addition, the above-described filter 117 may be provided at the outlet pipe of the preheating tank 410 connected to the first housing 110 or the second housing 310.

In addition, as shown, the heating means 420 may be provided on the upper part of the preheating tank 410 so that it can be inserted into the inside of the preheating tank 410, and may generate heat by power applied through the control unit. Use the heater (including heating wire) provided.

Furthermore, in another embodiment, the oil-water separation unit 100 according to the present invention replaces a part of the pump 119 individually installed in each space 111 and only uses oil floating on the top of the water within the space 111. A scraper 140 may be used to remove the oil by rotation and forcibly discharge it into the oil storage tank 200.

That is, when the oil separated from the water moves in the direction of the scraper 140 through the discharge of the above-described steam member 120, the scraper 140 forcibly removes the foreign substances that have moved through rotation and forms the oil storage tank 200. It is to be discharged as .

At this time, as shown in FIG. 7, the scraper 140 is the first to allow waste water to flow into the first housing 110 among the plurality of first to fourth spaces 111a to 111d formed in the first housing 110. It is preferable to install it instead of the pump 119 in the first space 111a or the second space 111b communicating with the first space 111a, because the second and third spaces Compared to (111c, 111d), the content and size of oil residues separated from the first and second space parts (111a, 111b) are larger, so it is possible to prevent clogging during suction with the tubular pump (119). A scraper 140 containing a rotating roller (not shown) that can remove foreign substances is used.

In addition, the scraper 140 in the present invention is described as removing foreign substances using a rotation method, but this is just one embodiment, and the scraper 140 using a chain method can also be used if necessary.

Meanwhile, in the present invention, at least one of the inlet pipe 10, the discharge pipe 20, and the drain pipe 30, as well as the inlet pipe and the outlet pipe, may be provided with a valve V that is opened and closed through a control unit. Note that there is

As described above, the oil-water separation device (1) according to the present invention is different from the conventional one by using the difference in specific gravity from wastewater mixed with oil and water through the oil-water separation unit (100) to quickly separate oil and water in stages. and accurately separated, but the separated oil is separately supplied to the oil storage tank 200 by the pump 119 and can be processed.

In addition, unlike the prior art, wastewater exists in the space 111 after oil-water separation through the washing member 130 provided in each space 111 divided into multiple sections within the oil-water separation unit 100. By cleaning the inside of the first housing 110 in an empty state, it is expected that another oil-water separation process can be performed in a clean state.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described later as well as all things that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

1: Oil-water separation device for separating oil and water by stage according to the present invention
100: Oil-water separation unit
110: first housing 111: space part
113: Bulkhead 115: Blocking plate
117: filter 119: pump
120: Steam member 130: Cleaning member
131: Washing water supply pipe 133: Nozzle
140: scraper
200: Oil storage tank
300: Screen member
310: second housing 320: screen
400: Preheating member
410: preheating tank 420: heating means

Claims (7)

In the oil-water separation device that separates water and oil mixed in wastewater flowing in from the outside,
The oil-water separation device is
An oil-water separation unit (100) that separates water and oil from wastewater flowing in from the outside through the inlet pipe (10) multiple times, and discharges the separated water to the outside through the discharge pipe (20); and
Includes an oil storage tank (200) for individually storing the oil separated by the discharge pressure of the oil-water separator (100),
The oil-water separation unit 100 includes a first housing 110 with a drain pipe 30 formed at the bottom, a plurality of partition walls 113 dividing the inside of the first housing 110 into a plurality of spaces 111, A blocking plate 115 formed in each space 111 adjacent to the partition wall 113, and a filter 117 provided on the upper part of each partition 113 so that the neighboring space parts 111 communicate with each other. ), a plurality of pumps (119) installed on the blocking plate (115) to prevent them from being submerged by wastewater flowing into each space (111), but discharging the oil separated by the difference in specific gravity into the oil storage tank (200), respectively. It is installed in the space 111 of the oil and water in stages, and includes a steam member 120 that applies heat to prevent the oil separated due to the difference in specific gravity from solidifying and moves the oil in the direction of the filter 117. Oil-water separation device.
According to paragraph 1,
The oil-water separation unit 100 further includes a cleaning member 130 for cleaning the bottom of the first housing 110,
The cleaning member 130 is
a washing water supply pipe 131 that is formed in the shape of a pipe (PIPE) having a predetermined length, is individually disposed in each space 111, and is connected to a washing water supply tank outside the first housing 110; and
An oil-water separation device for separating oil and water in stages, comprising a plurality of nozzles (133) formed along the length of the wash water supply pipe (131) and spraying wash water at a predetermined discharge pressure.
According to paragraph 2,
The washing water supply pipe 131 is
An oil-water separation device for separating oil-water in stages, characterized in that it is installed in a plurality of configurations to have different longitudinal directions at different heights in each space 111.
According to paragraph 1,
The oil-water separation device is installed in front of the oil-water separation unit 100 and further includes a screen member 300 that preferentially separates foreign substances or water and oil contained in the wastewater flowing into the first housing 110. ,
The screen member 300 is
An inflow pipe 10 is connected to one side, and the other side is formed to communicate with the first housing 110, and a second housing 310 with a drain pipe 30 formed at the bottom, and into the second housing 310. An oil-water separation device for separating oil and water in stages, comprising a screen 320 to separate foreign substances or oil mixed in the discharged wastewater.
According to paragraph 1,
The installation location of the steam member 120 is
It is installed to be submerged in the wastewater flowing into each space 111 to a predetermined depth, where the predetermined depth is within 10 to 20 cm downward from the surface of the water separated from the oil. Oil-water separation device.
According to paragraph 1,
The oil-water separation unit 100 is
Instead of the pump 119 individually installed in each space 111, a scraper 140 that removes the oil separated by the difference in specific gravity and discharges it into the oil storage tank 200,
The scraper 140 is an oil-water separation device for separating oil-water in stages, characterized in that it is installed in the oil-water separation unit 100 into which wastewater initially flows.
According to clause 4,
The oil-water separation device is
It further includes a preheating member 400 disposed on the oil-water separation unit 100 or the screen member 300 to preheat the wastewater,
The preheating member 400 is connected to the oil-water separation unit 100 or the screen member 300 by a pipe, and is installed to be separable from the preheating tank 410, where the inflow wastewater is stored. It includes a heating means 420 for heating the wastewater stored in the preheating tank 410,
The heating means 420 is an oil-water separation device for separating oil and water in stages, characterized in that it is a heater that generates heat by applied power.

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