JP2012179600A - Waste water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus which can simply remove oil and fat contained in waste water stored in an oily water separating tank and does not need interruption of the use of a sink.SOLUTION: The waste water treatment apparatus 1 includes: the oily water separating tank 2 which stores the waste water containing oil and naturally separates the stored waste water into an oil layer and a water layer by a difference in specific gravity; a waste water introduction port 31 which introduces the waste water into the oily water separating tank 2; an oil discharge port 32 for discharging the oil which is formed in the oily water separating tank 2 and forms the oil layer to the outside of the tank; a cover 61 as an oil layer converging means which converges the oil layer toward the oil discharge port 32 in accordance with waste water volume stored in the oily water separating tank 2; and a drain port 33 for discharging water which forms the water layer, in accordance with waste water volume to the outside of the tank.

Description

  The present invention relates to a wastewater treatment apparatus.

  A sink installed in a commercial kitchen such as a restaurant is provided with a wastewater treatment device that removes fats and oils in wastewater generated by washing of cooking utensils, for example. After removing the oil and fat with the wastewater treatment device, drain the wastewater into the sewer pipe.

The waste water treatment apparatus is provided with an oil / water separation tank (grease strap) for removing oil and fat in the waste water, and when the waste water generated in the sink reaches the grease strap, the grease trap temporarily stores the waste water in the tank. When the stored wastewater contains fats and oils, the fats and oils in the wastewater are separated from the water due to the difference in specific gravity between the oil and water. Since oil has a lower specific gravity than water, it floats above the drainage.
Until now, the oil and fat that floated has been sprinkled by a worker such as a restaurant and transferred to a container (bucket) dedicated to the oil and fat, after removing the oil and fat, the drainage was discharged into the sewer pipe.

However, the work of stroking with a handle is not only cumbersome but also interrupts other tasks.
In addition, in the grease strap, an oil waste liquid (scum) containing oils, fats, proteins, carbohydrates and the like adheres to the wall surface. If the state where the scum is attached is left unattended, it will cause bad odor, clogging of piping, cockroaches and rats. For this reason, it is necessary to remove scum.

  As a method for removing the scum, vacuum suction, spraying of a powder preparation, injection of a liquid preparation, and the like can be considered. However, these removal methods are very expensive. In addition, the conventional removal method has a problem that the use of the grease strap and thus the sink must be temporarily interrupted.

JP 2004-230271 A JP 2005-13771 A JP 2003-82755 A Microfilm of Japanese Utility Model No. 52-134480 (Japanese Utility Model Publication No. 54-60378) JP-A-51-27157 CD-ROM of Japanese Utility Model No. 3-98510 (Japanese Utility Model Application No. 5-39603)

  The present invention has been made in view of the above circumstances. The problem to be solved is at least to easily remove oils and fats contained in the drainage stored in the grease trap and to provide drainage technology that does not require the use of the sink to be interrupted.

In order to achieve the above object, the waste water treatment apparatus of the present invention employs the following means.
That is, the present invention stores an oil-containing wastewater containing oil, and naturally separates the stored wastewater into an oil layer and an aqueous layer with a specific gravity difference, and a drainage inlet for introducing the wastewater into the oil-water separation tank, An oil outlet formed in the oil / water separation tank for discharging the oil forming the oil layer out of the tank, and the oil layer converges toward the oil outlet according to the amount of drainage stored in the oil / water separation tank The wastewater treatment apparatus includes: an oil layer converging means for draining; and a drain outlet for discharging the water forming the water layer to the outside of the tank according to the amount of drainage.

  According to the present invention, when the wastewater stored in the oil / water separation tank is left for a while, the oil and water are separated by the difference in specific gravity, and the oil forms the upper layer of the wastewater and the water forms the lower layer. Further, when water is supplied into the tank by adding drainage or separately from the drainage, the storage amount in the oil / water separation tank increases according to the supply amount. By supplying water gently during the supply, the oil layer is raised while increasing the water layer.

  In the rise, the oil layer is converged by the oil layer converging means and receives water pressure from below. For this reason, the flow velocity of the oil layer toward the oil discharge port is increased, and the flow of oil discharged from the oil discharge port to the outside of the tank is boosted. Therefore, even oil having a specific gravity than water can be sufficiently discharged. Therefore, it is not necessary to rub oil with a handle as in the conventional case.

  The present invention also includes an oil / water separation tank for storing wastewater containing oil and naturally separating the stored wastewater into an oil layer and a water layer with a specific gravity difference, and a drainage inlet for introducing the wastewater into the oil / water separation tank. An oil discharge port formed in the oil / water separation tank for discharging the oil forming the oil layer to the outside of the tank, a water increasing means for supplying water for increasing the water separately from the waste water, and the water increasing means The oil layer converging means for converging the oil layer toward the oil discharge port according to the water level of the wastewater stored in the oil / water separation tank raised by the supply water, and the amount of water increase by the water increasing means is controlled, and predetermined water increase Then, it is also a waste water treatment apparatus having a water increase amount control means for stopping the water increase and a drain port for discharging water forming the water layer to the outside of the tank according to the amount of drainage.

  If the water increase is stopped by the water increase control means when the oil layer is sufficiently discharged from the oil / water separation tank, it is possible to prevent the lower water layer from being discharged from the oil / water separation tank. In order to implement the stop control of the water increase, for example, a water amount detection sensor or a water level detection sensor for detecting the storage amount may be used.

  The oil / water separation tank includes a filtration unit that filters solids from wastewater flowing into the oil / water separation tank, a filtered water separation unit that stores the wastewater filtered by the filtration unit and naturally separates the oil layer and the water layer, and the filtration unit. A temporary storage section for guiding the water forming the water layer from below the water separation section, and temporarily storing the guided water before draining it from the oil / water separation tank to the outside of the tank. An outlet is provided, and the water stored in the storage section for a while is discharged from the drain outlet to the outside of the tank, and the converging means and the oil outlet are provided in the filtered water separation section.

  Since the solid matter contained in the wastewater flowing into the oil / water separation tank from the wastewater introduction port is removed from the wastewater by the filtration unit, it is difficult for the solid matter to accumulate in the oil / water separation tank. Therefore, it is possible to prevent the volume of the oil / water separation tank from being reduced due to the accumulation of solid matter in the oil / water separation tank. Therefore, it is possible to prevent the amount of wastewater that can be treated from being reduced due to the accumulation of solid matter.

  In the temporary storage section, the water forming the water layer is guided from below the filtered water separation section in preference to the oil and fat forming the oil layer located above the filtered water separation section. It becomes difficult to be introduced. In addition, the water that forms the water layer is temporarily stored in the temporary storage unit before being discharged outside the tank, and then drained from the drain port provided in the temporary storage unit. Easy to do.

This is because the filtered water separation unit gives the drainage function to the oil layer and the water layer exclusively, rather than the drainage function in addition to the function to separate the drainage into the oil layer and the water layer. This is because the oil layer and the water layer can be easily separated and the oil can be easily treated.

  It is preferable to form a water flow passage in the lower part of the filtered water separation part for circulating the water forming the water layer with the temporary storage part. By doing in this way, it is because the water which forms the water layer isolate | separated by the filtered water separation part can be guided to a temporary storage part preferentially to the fats and oils which form an oil layer.

  The oil / water separation tank water preferably has a bubble generating device that generates bubbles for promoting oil / water separation. By the bubbles, the oil / water separation of the waste water is promoted, and the effect of removing the oil / fat from the waste water in the oil / water separation tank can be promoted.

The temporary storage unit may have pre-drainage oil removing means for removing oil in the drainage before draining the drainage stored in the temporary storage unit from the oil / water separation tank to the outside of the tank.
Before draining from the oil / water separation tank to the outside of the tank, the oil content in the drainage can be removed by the pre-drainage oil removing means, so that the drainage discharged outside the tank does not contain oil. As a result, an environmentally friendly wastewater treatment apparatus can be provided.

  The wastewater treatment apparatus of the present invention stores oil-containing wastewater, and naturally separates the stored wastewater into an oil layer and a water layer with a specific gravity difference, and is installed in the oil-water separation tank. An expansion part that is expanded in the stored drainage in a state where the drainage is stored in the separation tank, and oil that is formed in the oil-water separation tank and has a specific gravity lighter than water when the expansion part expands. It is also a wastewater treatment apparatus having an oil discharge port and a drain port for discharging water forming the water layer to the outside of the tank according to the expansion amount of the expansion part.

  According to the present invention, when the wastewater stored in the oil / water separation tank is left for a while, an oil layer composed of oil is formed on the upper portion of the wastewater in which light oil having a specific gravity is stored as described above, and the water is formed in the lower portion. An aqueous layer is formed.

  In this state, when the inflating part is inflated, the amount of stored wastewater is apparently increased according to the amount of expansion, and the wastewater located above the inflating part is raised. As a result, the oil layer that forms the upper layer of the drainage is discharged out of the tank through the oil discharge port in preference to the water layer that forms the lower layer.

  Examples of the inflating part include those that are connected to a fluid supply unit and inflated when fluid is introduced from the fluid supply unit.

  For example, a bellows shape that expands and contracts in the vertical direction with a pleat can be considered as the inflating portion. Air can be exemplified as a fluid for inflating the inflatable portion. An example of the fluid supply means is an air pump.

  Since the expansion part has a bellows shape, when storing the wastewater in the oil / water separation tank, the air is extracted from the expansion part to be in a contracted state, and the wastewater is stored in the oil / water separation tank in this state. Then, by supplying air with an air pump and expanding the expansion portion, the apparent increase of the wastewater stored in the oil / water separation tank is generated as described above. Therefore, the fats and oils that form the upper layer of the wastewater are discharged from the oil discharge port in preference to the water that forms the water layer.

For this reason, even if it is in the said invention, it is not necessary for an employee to scoop fats and oils conventionally. Therefore, the oil and fat contained in the waste water can be easily removed. The pushing-up force of the entire drainage due to the expansion of the expanding portion is determined in consideration of the volume of the oil / water separation tank, the weight per unit volume of the drainage, the discharge force of the fluid supply means, and the like. Moreover, how much the apparent raising of the waste_water | drain stored in the oil-water separation tank by an expansion part is effective by detecting a water level with the water level detection sensor installed in the oil-water separation tank. In addition, the water level here may be either the waste water containing oil or the water level forming the water layer in the waste water. In short, it is only necessary to detect a change in the volume of the wastewater stored in the oil / water separation tank.

  The oil / water separation tank includes a filtration unit that filters solids from wastewater flowing into the oil / water separation tank, a filtered water separation unit that stores the wastewater filtered by the filtration unit and naturally separates the oil layer and the water layer, and the filtration unit. A temporary storage unit that guides the water that forms the water layer from below the water separation unit, and temporarily stores the guided water before draining it from the oil / water separation tank to the outside of the tank, and the water stored in the temporary storage unit It is preferable to provide a drain outlet for discharging the water to the outside of the tank, and to provide the expansion portion and the oil discharge port in the filtered water separation portion.

  Since the solid matter contained in the wastewater flowing into the oil / water separation tank from the wastewater introduction port is removed from the wastewater by the filtration unit, it is difficult for the solid matter to accumulate in the oil / water separation tank. Therefore, it is possible to prevent the volume of the oil / water separation tank from being reduced due to the accumulation of solid matter. Therefore, it is possible to prevent the amount of wastewater that can be treated from decreasing due to the accumulation of solid matter.

  Since the water that forms the water layer is guided to the temporary storage unit from below the filtrate separation unit, the oil that forms the oil layer located above the filtrate separation unit is relatively introduced into the temporary storage unit. It becomes difficult. In addition, the water forming the water layer is temporarily stored in the temporary storage unit before being discharged out of the tank, and then drained from the drain port provided in the temporary storage unit. It becomes easy to do.

  In addition to making the filtered water separation part have the function of separating the waste water into the oil layer and the water layer, the filtered water separation part also has a large burden on the filtered water separation part. Rather, it is easier to separate the drainage into the oil layer and the water layer by the filtered water separation unit when the filtered water separation unit is exclusively provided with the function of separating the drainage into the oil layer and the water layer.

It is preferable to have a water flow passage for circulating the water that forms the water layer with the temporary storage section in the lower part of the filtered water separation section.
In the filtered water separation part, the water layer is located below the oil layer. For this reason, the water layer separated by the filtrate separation part is formed by forming the water flow passage which distribute | circulates the water which forms the said water layer between the temporary storage parts in the lower part of the filtrate separation part. Water can be actively guided to the reservoir for a while.

  The expansion part is provided with a scraper at the upper end in the expansion / contraction direction, and a scraper that scrapes off the oil adhering to the inner surface of the oil / water separation tank in contact with the inner surface of the oil / water separation tank. A passage port through which the filtered water is allowed to pass through the filtered water separation part may be formed.

  The passage serves as a water flow passage for circulating the water forming the water layer with the temporary storage section. Moreover, since the scraper is installed in the expansion-contraction direction upper end of an expansion part, a scraper reciprocates according to expansion | swelling and contraction of an expansion part.

  The scum adhering to the inner surface of the oil / water separation tank can be scraped off by the scraper through the suction port. Since the component of scum is oil and fat, when it is peeled off, the effluent floats and eventually becomes contained in the oil layer. Thus, when the oil layer is removed, the scum is discharged together.

  The drain port formed in the temporary storage unit is preferably located below the oil discharge port formed in the filtered water separation unit.

  In the oil-water separation tank, oil containing light oil has a specific gravity that is lighter than that of water, and the water forms the lower layer.Water forms the lower layer. This is because they can be efficiently removed.

  It is preferable that the drain port has a control unit that controls discharge of the water stored in the temporary storage unit to the outside of the tank. It is preferable that the waste water treatment can be controlled in consideration of the environment, and is controlled by the control means.

  You may make it have the separation plate for making it easy to isolate | separate the oil component in waste_water | drain from a water | moisture content by making the said filtration part collide with waste_water | drain. Since the wastewater is separated into oil and moisture in advance by the collision, it is easy to naturally separate the oil layer and the water layer in the filtered water separation unit.

  In order to control the water level of the wastewater stored in the filtered water separation unit, it is preferable to have an expansion unit control means for controlling the expansion amount of the expansion unit. Examples of the expansion unit control means include a water level detection sensor that detects the water level of the filtered water separation unit.

Furthermore, this invention is also a sink provided with the above-mentioned waste water treatment apparatus.
According to the sink of the present invention, it is not necessary to temporarily interrupt the use of the sink when removing the scum.

  According to the present invention, at least oils and fats contained in the wastewater stored in the grease trap can be easily removed.

1 is an overall perspective view of a sink to which a wastewater treatment apparatus according to a first embodiment of the present invention is applied. It is a partially cutaway front view of FIG. It is a top view of FIG. It is a partially cutaway side view of the grease strap according to the present invention. It is the VV sectional view taken on the line of FIG. It is a side view of the grease strap concerning the present invention. It is the principal part expansion perspective view seen from the arrow VII direction of FIG. It is the figure seen from the arrow VIII direction of FIG. It is the IX-IX sectional view taken on the line of FIG. It is sectional drawing of the waste water treatment apparatus which concerns on 2nd Example of this invention, Comprising: It is a figure corresponded in FIG. It is a principal part expansion perspective view of FIG.

  Hereinafter, the present invention will be described based on each example.

FIG. 1 shows a sink 100 to which a wastewater treatment apparatus 1 according to a first embodiment of the present invention is applied.
The wastewater treatment apparatus 1 is an apparatus that removes oil from wastewater by removing oils and fats contained in the wastewater generated by washing the cooking utensils in the sink 100, for example. The drainage from which the oil has been removed flows toward a sewer pipe (not shown) as sewage.

  The sink 100 includes a main body 103 as a sink and four legs 104 that support the main body 103. And the waste water treatment apparatus 1 is installed under the main body 103.

  The main body 103 is a two-piece sink that is divided into two by a partition wall 103a formed in the center in the longitudinal direction, and a sink is divided into left and right.

  As can be seen from FIGS. 1 to 3, a drain outlet 105 is provided at the bottom of each sink, and a water pipe 106 extending downward is connected to each drain outlet 105. These water distribution pipes 106 are connected to a joint pipe 311 attached to a drainage inlet 31 that is a drainage inlet to the wastewater treatment apparatus 1.

  In addition, the main body 103 has an unillustrated stove that serves as a water outlet (faucet) and a backboard 107 for preventing water splash from the rear edge of the main body 103.

  The four legs 104 are connected by a frame 108 except for the connection of the left and right legs 104R and 104L located on the front side in FIG. Here, front and rear, right and left, and upper and lower in this specification are based on FIG. 2 unless otherwise specified, and the front side and the opposite side are referred to as the front and rear direction in a state of facing FIG. It is called the direction, and the upper and lower sides are also called the up and down direction.

  The waste water treatment apparatus 1 is formed by welding a metal plate made of aluminum or other metal or alloy having excellent corrosion resistance, and the whole has a substantially hollow rectangular parallelepiped shape. In addition, casters 11 that are transportable wheels are attached to the four corners of the lower surface. The caster 11 is provided with a rotation suppression mechanism (not shown) that suppresses the rotation of the caster 11 so that the wheels do not rotate arbitrarily.

Next, the internal structure of the waste water treatment apparatus 1 will be described in detail.
As described above, the waste water treatment device 1 is a device that removes oil from waste water containing oil introduced from the sink 100.

  For this reason, the waste water treatment apparatus 1 has an oil / water separation tank 2 for storing waste water containing oil flowing from the sink 100. In the oil / water separation tank 2, a drainage introduction port 31 for introducing drainage from the sink 100, a discharge port 32 for exclusively discharging oil to the outside of the oil / water separation tank 2 (outside the tank), and drainage from which oil has been removed And a drain port 33 for discharging to the outside (see FIG. 4).

  The oil / water separation tank 2 has a hollow rectangular parallelepiped shape made of a corrosion-resistant metal plate. Further, the interior is partitioned by a partition, and a plurality (three in this embodiment) of rooms (parts) are divided vertically.

  As can be seen from FIGS. 4 and 6, the rooms are arranged in parallel from left to right in the order of the filtration unit 5 -the filtered water separation unit 6 -the temporary storage unit 7. In other words, the filtration unit 5 is an area located on the upstream side in the oil / water separation tank 2, and the filtered water separation part 6 is an area located in the center of the oil / water separation tank 2. The temporary storage unit 7 is an area located on the right side, that is, on the downstream side in the flow direction of the waste water in the oil / water separation tank 2.

  The size occupied by these in the oil / water separation tank 2 is approximately the same in the filtration unit 5 and the temporary storage unit 7, and both are about one third of the size of the filtration water separation unit 6.

  Moreover, as shown in FIG. 4, the partition which partitions off the filtration part 5 and the filtrate separation part 6 is shown with the code | symbol 201, and the partition which partitions off the filtrate separation part 6 and the temporary storage part 7 is shown with the code | symbol 202. FIG. In the filtered water separation unit 6, a guide wall 203 that guides wastewater flowing in via the filtering unit 5 is erected on the bottom surface 21 b of the oil / water separation tank 2 in parallel with the partition wall 201.

  The partition wall 201 and the guide wall 203 form an introduction path 213 for introducing drainage from the filtration unit 5 to the filtrate separation unit 6 (see FIG. 4). The introduction path 213 is indicated by an arrow in FIG.

  4-6, among the wall surfaces that form the outer wall of the oil / water separation tank 2 and are erected from the bottom surface 21b, the side wall surface (left surface) on the filtration unit 5 side is denoted by reference numeral 22l, and the temporary storage unit side The wall surface (right surface) is indicated by reference numeral 22r. The front and rear walls of the oil / water separation tank are denoted by reference numerals 22f and 22b, respectively.

  Furthermore, the ceiling surface of the oil / water separation tank 2 is denoted by reference numeral 21c. A hollow space S having a rectangular parallelepiped shape is defined in the oil-water separation tank 2 by the bottom surface 21b, the sidewall surface 22l, the sidewall surface 22r, the front wall 22f, the rear wall 22b, and the ceiling surface 21c.

  The ceiling surface 21c is preferably detachable so that the inside of the oil / water separation tank 2 can be visually recognized. An oil discharge port 32 is formed in the front wall 22f (see FIG. 5).

Next, the filtration unit 5, the filtered water separation unit 6, and the temporary storage unit 7 will be described in detail.
The filtration unit 5 is a part for filtering solid matter from waste water flowing into the waste water treatment apparatus 1 from the sink 100 via the water distribution pipe 106. Moreover, the said drainage inlet 31 is provided in the filtration part 5 (refer FIG. 6). The drainage inlet 31 is formed at three locations on the upper surface of the filtration unit 5: the front surface, the left surface, and the rear surface.

  As described above, the drainage inlet 31 is provided with a joint pipe 311 penetrating the wall surface of the filtration unit 5 for connecting to the water pipe 106 extending from the sink 100. And in the filtration part 5, the solid substance acquisition basket 51 is installed for the filtration just under the joint pipe 311 (refer FIG.4, 6 grade | etc.,). The solid acquisition rod 51 is made of a wire mesh and has a hollow rectangular parallelepiped shape that opens upward. Drainage from the sink 100 flows into this opening via the joint pipe 311. The solid matter acquisition basket 51 is sized so as to substantially contact the inner surface of the filtration unit 5.

  The reason why the drainage inlets 31 are installed at three locations is to allow the drainage inlets 31 to be used separately in the case of two sinks and the case of one as in the present embodiment. However, one of the drainage introduction ports 31 can be applied as a water increasing means for supplying water for water increase into the oil / water separation tank (inside the tank) separately from the drainage. The water increasing means will be described later.

  In addition, a separation plate portion 53 formed by zigzag arranging a plurality of plates in a state of three-dimensionally crossing each other with respect to the other plate is provided below the solid matter acquisition basket 51 in the filtration unit 5. By installing the separation plate part 53 in the filtration part 5, a zigzag path 54 is formed below the solid matter acquisition basket 51 (see FIG. 4 and the like).

  Then, the waste water filtered by the solid matter collecting basket 51 flows downstream while colliding with each plate 531 forming the separation plate portion 53 while passing through the zigzag path 54. Due to the impact at that time, the oil contained in the filtered waste water is easily separated from the water.

The filtered water separator 6 adjacent to the filter 5 will be described.
The filtered water separation unit 6 is a space part having a hollow cubic shape in order to store the waste water from which the solid matter has been filtered by the filtering unit 5. The stored waste water is naturally separated into an oil layer (oil layer) as an upper layer of the waste water and a water layer (water layer) as a lower layer due to the difference in specific gravity.

The filtered water separator 6 is formed with the oil outlet 32 formed in the front wall 22f of the oil / water separator tank 2. A cover 61 is assigned to the oil discharge port 32.

  The cover 61 is installed in the upper part of the filtered water separation part 6 so that FIG. The outer shape is a truncated quadrangular pyramid by cutting the head of the regular quadrangular pyramid horizontally, and along the line connecting the apex of the regular quadrangular pyramid and the center of the bottom before the truncated quadrangular pyramid. It is shaped like a cut.

  For convenience of explanation, reference numeral 611 denotes a ceiling surface of the cover 61, reference numeral 612 denotes a side surface of the cover 61, and reference numeral 613 denotes a cut surface when cut along a line connecting the vertex and the center of the bottom surface. To do. As shown in FIGS. 4 to 7, the cut end 613 has a trapezoidal shape in which the lower base is longer than the upper base.

  In addition, the oil discharge port 32 is surrounded by the cover 61 in a state in which a portion 613 a corresponding to the ceiling surface 611 of the cut surface 613 of the cover 61 is in contact with the upper side 32 a of the oil discharge port 32. Thus, the cover 61 is installed in the filtered water separation part 6 (refer FIGS. 4-7).

  As a result, the upper part of the filtered water separation unit 6 has a cover space S1 defined by the cover 61 and the front wall 22f, in other words, a hollow when the half-divided teacup is turned down (hereinafter, an inverted half-covered bowl-shaped space) S1) is formed in the hollow space S.

  In addition, a known bubble generating device 63 that generates bubbles for promoting oil / water separation is installed at the center of the bottom surface of the filtered water separator 6 (see FIG. 4). The guide wall 203 and the partition wall 202 are provided upright from the bottom surface 21b around the bubble generating device 63 (at least on both sides).

  The partition wall 202 is formed with a rectangular through hole 202a through which drainage stored in the filtrate separator 6 is passed from the filtrate separator 6 to the temporary reservoir 7 at least in a lower part thereof (FIG. 8). Therefore, it can be said that a water flow passage through which water flows through the through hole 202 a is formed in the lower part of the filtered water separation unit 6 between the filtered water separation unit 6 and the temporary storage unit 7. A water flow passage is indicated by reference numeral 67. The water flow passage 67 is indicated by an arrow in FIG.

  An oil receiver 321 including an oil drain 321a that takes oil discharged from the oil discharge port 32 is provided on the outer surface of the front wall 22f. The oil catcher 321a is detachable from the oil receiver 321 and the oil component discharged from the oil outlet 32 is collected by the oil catcher 321a. The collected oil is taken out of the oil catch 321a from the oil receiver 321 and discarded as waste oil in a disposal bucket (not shown).

  Further, the oil receiver 321 is attached with a water supply pipe 323 through which drainage that has passed through the oil collecting rod 321a passes (see FIGS. 5 and 6). The water supply pipe 323 is communicated with a water discharge pipe 4 (see FIGS. 4, 6, and 8) described later for discharging the wastewater stored in the temporary storage section 7 to the outside of the tank.

  Further, the filtered water separation unit 6 is provided with a known water level detection sensor 62 that detects the water level in the filtered water separation unit 6.

Next, the temporary storage unit 7 will be described.
The temporary storage unit 7 is a part that guides the water forming the water layer from below the filtered water separation unit 6 and temporarily stores the guided water before draining it from the oil / water separation tank 2 to the outside of the tank.

The temporary storage unit 7 has pre-drainage oil removal means 8 for further removing oil contained in the stored wastewater before discharging the wastewater stored therein to the outside of the tank (FIGS. 8 and 9). reference). The temporary storage section 7 is provided with the drainage port 33 on the front wall 22f for discharging the wastewater from which the oil has been removed by the pre-drainage oil removal means 8 to the outside of the tank.

  As shown in FIG. 4, the drain port 33 is formed to be separated from the oil discharge port 32 formed in the filtered water separation unit 6 by a dimension h. Further, a water discharge pipe 4 shaped like an inverted L-shape is attached to the drain outlet 33, and the waste water stored in the temporary storage section 7 is discharged from the waste water treatment apparatus 1 through this water discharge pipe 4. The

  One end of the water discharge pipe 4 has a suction port 4a located below the discharge surface (water surface) of the wastewater stored in the temporary storage unit 7 (see FIG. 4), and the temporary storage unit at the other end. 7 has a discharge port 4b which is positioned outside the suction port 4a and extends downward from the suction port 4a (see FIG. 6). The suction port 4 a is formed with a dust removal port (not shown) for removing dust and the like attached to the water discharge pipe 4, and the dust removal port is normally closed by an opening / closing lid 41. Opening / closing lid 41 is opened to remove dust regularly or when drainage from the discharge port becomes worse.

  The pre-drainage oil removing means 8 is for further removing oil that is still contained in the drainage of the temporary storage section 7 using the oil absorption filter 81 (see FIG. 9).

  The oil removal means 8 before draining includes a trackless oil absorption filter 81 extending in the vertical direction, a driving roller 82 and a driven roller 83 that rotatably support the oil absorption filter 81 at its upper and lower ends, and an oil absorption filter 81. And an oil bowl 85 integrally formed with a claw portion 84 for scraping off the adhered oil.

  The driving roller 82 and the oil tank 85 are positioned above the water surface stored in the temporary storage unit 7. The drive roller 82 and the driven roller 83 are rotatably attached to the side wall surface 22r, and the oil tank 85 is attached to the rear wall 22b.

  An operating handle 821 for rotating the driving roller 82 is coaxially attached (see FIGS. 1, 6 and 8). Then, by rotating the operation handle 821, the driving roller 82 rotates, and the oil absorption filter 81 wound around the driving roller 82 and the driven roller 83 rotates. The oil adhering to the oil absorption filter 81 with the rotation is scraped off by the tip of the claw portion 84 that contacts the oil absorption filter 81.

  The shaved oil is dropped into the oil bowl 85 where it is collected. The collected oil is thrown into a disposal bucket in the same manner as the waste oil collected in the oil collecting bowl 321a.

  Thus, in the wastewater treatment apparatus 1, since both the oil that has formed an oil layer in the filtered water separation unit 6 and the oil collected by the pre-drainage oil removal means 8 in the temporary storage unit 7 can be removed from the wastewater, The wastewater that flows into the sewage can be made almost free of oil. Therefore, it becomes possible to treat wastewater with a very low oil content.

  Next, the water increase means and the water increase amount control means for controlling the water increase amount by the water increase means and stopping the water after a predetermined water increase will be described.

  The water increasing means is for supplying water for increasing water into the tank separately from the waste water generated in the sink 100 as described above. For example, a water outlet different from the above-mentioned stove is provided by being connected to one of three drainage inlets 31 via a water pipe (not shown).

Further, in order to control the amount of water increase, the water level sensor 62 (see FIG. 4) provided in the filtered water separation unit 6 performs the outflow and stoppage of tap water from the water outlet. The water level sensor 62 detects that the wastewater stored in the filtered water separation unit 6 reaches a predetermined water level. When it is detected that the storage amount of the oil / water separation tank 2 has reached the predetermined water level, the water level is automatically stopped and the water level of the filtered water separation unit 6 is always kept constant.

  Examples of the water level sensor 62 include a diaphragm type water level detection sensor that turns on a reed switch when a water pressure is applied, closes a valve of a water pipe by an electrical mechanism using this as a trigger, and supplies water when the water pressure is released. Therefore, it can be said that the water level sensor 62 is a water increase amount control means for automatically controlling the water increase amount.

  As another example, the floating ball descends as the water level falls, and the floating ball used in the floating ball type toilet that opens the valve connected to the floating ball and catches water from the spout is separated by the filtered water separation unit. You may apply to 6. In this case, the water stop control and the water supply control are performed using the rising and falling of the floating ball as a trigger.

  Further, it is conceivable that the water stop and water supply are performed manually by notifying with a buzzer when a predetermined water level is reached. In this case, the predetermined water level is a level at which the upper oil layer is mostly discharged from the oil discharge port 32 when the water level of the wastewater accompanying the storage reaches the predetermined water level, or a buzzer sounded. After that, it is desirable to use it as a guide for stopping the water after a predetermined time. The water level is determined by, for example, a rule of thumb.

  And you may make it process sequentially the waste_water | drain stored in the oil-water separation tank 2 by performing operation which only flows the waste_water | drain produced in the sink 100 to the waste water treatment apparatus 1, even if it does not increase actively. In this case, the water level sensor may not be provided.

  However, in this case, if the water is drained at a time more than the amount of drainage stored in the oil / water separation tank 2, both oil and water are mixed into the sewer pipe at once without forming an oil layer and a water layer. There is a risk of flowing. Therefore, in order to be able to remove only the oil from the drainage from the sink, it is necessary to ensure a sufficient time for leaving the drainage after flowing the drainage into the oil / water separation tank 2.

  Next, a procedure for treating wastewater using the wastewater treatment apparatus 1 according to the first embodiment having such a configuration will be described.

  When drainage is not stored in the oil / water separation tank 2 such as when the wastewater treatment apparatus 1 is used for the first time, the drainage generated in the sink 100 is a joint provided at the drainage port 105 -the water distribution pipe 106 -the drainage introduction port 31. The pipe 311-filter part 5-introduction path 213 is reached to the filtrate separation part 6 and gradually accumulated in the entire oil-water separation tank 2.

  In the filtration part 5, the waste water from which the solid matter has been filtered by the solid matter collecting trough 51 flows downstream. In the downstream flow, the drainage collides with each plate 531 forming the separation plate portion 53 while passing through the zigzag path 54 as described above. Due to the impact at that time, the oil contained in the filtered waste water is easily separated from the water.

  Simultaneously with the storage in the filtered water separation unit 6, the waste water is gradually stored in the temporary storage unit 7 via the through hole 202 a formed in the partition wall 202 that partitions the filtered water separation unit 6 and the temporary storage unit 7. go.

  When fats and oils are contained in the waste water, the fats and oils in the waste water are separated from the water due to the specific gravity difference between the oil and water. Since the specific gravity of oil is lighter than that of water, the oil naturally floats above the drainage, and the amount of drainage stored in the oil / water separation tank 2 gradually increases while the oil forms the upper layer of the drainage and the water forms the lower layer.

  And drainage is stored until it reaches the oil discharge port 32, and an oil layer and a water layer are formed in the meantime. When the storage amount further increases while forming the oil layer and the water layer, the oil layer is discharged from the oil discharge port 32 in the filtered water separation unit 6. Further, in the drainage stored in the temporary storage unit 7, the upper oil layer is discharged from the water discharge pipe 4 to the outside of the tank via the drainage port 33.

  As described above, the drain port 33 is formed below the oil discharge port 32 formed in the filtered water separation unit 6 by the dimension h, so that the drain port 33 precedes the oil discharge port 32. Oil is discharged from the tank. In the filtration unit 5, the oil remains without being discharged. The oil content in the temporary storage unit 7 may be removed by the pre-drainage oil content removing means 8 before the oil content is discharged from the temporary storage unit 7.

  The drainage port 33 formed in the temporary storage unit 7 is preferably located below the oil discharge port 32 formed in the filtered water separation unit 6.

  The drainage containing oil forms an upper layer of drainage in which oil having a specific gravity lower than that of water is stored in the oil / water separation tank 2, and the water forms a lower layer. It is preferable to provide it. As a result, each layer can be removed efficiently.

  As the drainage rises, the oil forming the upper layer in the filtered water separation unit 6 rises in the covering space S1 defined by the covering 61 and the front wall 22f. With the rise, the oil layer changes while matching its form with the covering space S1. That is, the oil layer rises while converging toward the oil discharge port 32 while changing the form into the inverted half-covered bowl shape described above, and eventually flows out from the oil discharge port 32.

  Since the oil layer can be converged in this way by storing the wastewater with the cover 61 attached to the filtered water separation unit 6, the cover 61 converges toward the oil discharge port 32 according to the amount of drainage. It can be said that it is an oil layer convergence means.

  In the rise, as described above, the oil layer is converged by the oil layer converging means, and the water pressure is received from below as the amount of stored water increases. For this reason, the flow velocity of the oil layer toward the oil discharge port 32 increases, and the flow of oil discharged from the oil discharge port 32 to the outside of the tank is given momentum. Therefore, even oil having a specific gravity than water can be sufficiently discharged. Therefore, it is not necessary to rub oil with a handle as in the conventional case.

  Next, as described above, after using the waste water treatment device 1 for the first time, the waste water is further drained into the oil / water separation tank 2 storing the waste water from which the oil has been removed from the filtered water separation unit 6 and the temporary storage unit 7. The treatment of oil and water in the oil / water separation tank 2 and the operation and effects will be described below.

  When the wastewater containing oil further flows from the sink 100, the wastewater containing oil in the filtration unit 5 is pushed downstream and reaches the filtered water separation unit 6 and the temporary storage unit 7. As the waste water flows downstream in the filtration unit 5, the waste water from which the solid matter has been removed by the solid matter collecting trough 51 as described above forms the separation plate portion 53 while passing through the zigzag path 54. It flows downstream while colliding with the plate 531. Therefore, the impact at that time makes it easier for the oil contained in the filtered wastewater to be separated from the water.

  Also in this case, the fat and oil in the drainage is separated from the water due to the specific gravity difference between the oil and water, the oil forms the upper layer of the drainage, the water forms the lower layer, and the storage amount in the oil / water separation tank increases according to the supply amount. . By supplying water gently during the supply, the oil layer is raised while increasing the water layer.

  The oil that forms the upper layer as it rises rises while changing the form of the covering space S1 defined by the covering 61 and the front wall 22f as described above.

  In addition, when the oil layer is sufficiently discharged from the oil / water separation tank 2, the water level sensor 62 is set so that the drainage is not stored in the oil / water separation tank 2, so that the water layer is the oil / water separation tank 2. Can be prevented from being discharged.

  Moreover, since the solid substance contained in the waste water flowing into the oil / water separation tank 2 from the sink 100 is removed from the waste water by the filtration unit 5, it is difficult for the solid substance to accumulate in the oil / water separation tank 2. Therefore, it is possible to prevent the volume of the oil / water separation tank 2 from being reduced due to the accumulation of solid matter in the oil / water separation tank 2. Therefore, it is possible to prevent the amount of wastewater that can be treated from being reduced due to the accumulation of solid matter.

In the temporary storage unit 7, the water forming the water layer is guided from below the filtered water separating unit 6 in preference to the oil forming the oil layer positioned above the filtered water separating unit 6. It becomes difficult to be introduced into the temporary storage unit 7.
In addition, the water that forms the water layer is temporarily stored in the temporary storage unit 7 before being discharged out of the tank, and then drained from the drain port 33 provided in the temporary storage unit 7. Ease control is easy.

  Rather than having the drainage function effective in addition to separating the drainage into the oil layer and the water layer, the filtered water separation unit 6 has the function of separating the drainage into the oil layer and the water layer exclusively. This is because it becomes easy to separate into an aqueous layer, and it becomes easy to treat the oil.

  Since it has the water flow path 67 which distribute | circulates the water which forms the said water layer between the temporary storage parts 7 in the lower part of the filtrate separation part 6, the water which forms the water layer isolate | separated by the filtrate separation part 6 Can be guided to the storage unit 7 for a while in preference to the oil and fat forming the oil layer.

  Since the oil / water separation tank water has a bubble generating device 63 that generates bubbles for promoting oil / water separation, oil / water separation of drainage is promoted by the generated bubbles, and oil and fat is removed from the wastewater in the oil / water separation tank 2. The effect can be enhanced.

  The temporary storage unit 7 has a pre-drainage oil removal means 8 that removes the oil in the drainage before draining the drainage stored therein from the oil / water separation tank 2 to the outside of the tank. Oil in the drainage can be removed before draining the drainage. Therefore, the drainage discharged outside the tank does not contain oil and can be made environmentally friendly.

  Further, since the oil and fat can be removed along with the increase in the amount of wastewater stored in the oil / water separation tank 2, the use in the sink 100, that is, the washing of the tableware containing oil is interrupted for the removal. There is no need.

  Further, after the elapse of a predetermined time, the water forming the water layer is removed from the oil / water separation tank 2 (hereinafter referred to as water removal). By the said water removal, the quantity of the waste_water | drain currently stored in the oil-water separation tank 2 is reduced, and the process of the waste_water | drain containing the fats and oils by the waste water treatment apparatus 1 by this is continued and implemented. In order to reduce the amount of wastewater stored in the oil / water separation tank 2, the wastewater stored in the temporary storage section 7 is discharged through the water discharge pipe 4 as described above.

Next, referring to FIGS. 10 and 11, a wastewater treatment apparatus 1A according to the second embodiment will be described.
The main difference between the wastewater treatment apparatus 1A and the wastewater treatment apparatus 1 according to the first embodiment is that the oil layer is discharged from the filtrate separation part 6 by apparently increasing the amount of wastewater stored in the filtrate separation part 6. In the point. This will be described below.

  The same parts as those in the first embodiment are denoted by the same reference numerals as those used in the first embodiment, and the description thereof is omitted. Further, although the pre-drainage oil removing means 8 shown in the first embodiment is not shown in the second embodiment, it is also provided in the second embodiment as in the first embodiment.

  The filtered water separation unit 6 has an expansion unit 50 that is expanded in the stored drainage in a state where the drainage is stored in the oil / water separation tank 2. The inflatable portion 50 is made of a cloth material that is not easily corroded, hard vinyl chloride that is resistant to oil, and the like, and has a bellows shape that extends and contracts in the vertical direction with a fold 50a on the outer peripheral surface. The bubble generating device 63 and the guide wall 203 of the first embodiment are not included as constituent members in the second embodiment because of the installation of the inflating part 50. However, they may be used as components.

  Moreover, the scraper 60 is installed in the expansion | swelling part 50 at the upper end of the expansion-contraction direction (refer FIG. 10, 11). The scraper 60 abuts against the inner surface of the filtered water separation unit 6 (the inner surface of the oil / water separation tank 2), and scrapes off the attached oil.

  The scraper 60 has a basin shape, and the opening edge 601 abuts against the inner surface of the filtrate separator 6. Then, when the expanding portion 50 expands and contracts, the scraper 60 reciprocates, and accordingly, the opening edge 601 of the scraper 60 scrapes off the scum that is the oil component that is in contact with the inner surface of the filtered water separating portion 6. Moreover, since the scraper 60 is a washbasin shape, the shape of the filtered water separation part is applied in the shape of a cylinder. The reference numeral 6A is used for the filtered water separation unit of the second embodiment.

  In the scraper 60, water that forms a water layer between the passage port 603 through which the filtered water filtered by the filtering unit 5 on the peripheral edge and the peripheral wall surface of the scraper 60 passes through the filtered water separating unit 6A, and the temporary storage unit 7. A water distribution port 605 for performing distribution is uniformly formed. The distinction between the passage port 603 and the distribution port 605 is made functionally. A hole through which wastewater enters from the filtration unit 5 to the filtered water separation unit 6A is a passage port 603, and a hole through which wastewater is sent from the filtered water separation unit 6A to the temporary storage unit 7 is a circulation port 605.

  Therefore, the passage through which the waste water from which the solid matter has been removed by filtration between the filtration unit 5 and the filtrate separation unit 6A via the passage port 603 passes, and the filtrate separation unit 6A and the temporary storage unit via the water distribution port 605. It can be said that the water flow path 67 which distribute | circulates the water which forms the water layer currently stored in 6 A of filtered water separation parts between 7 is formed in the lower part of 6 A of filtered water separation parts.

  Furthermore, the expansion part 50 is connected to an air pump 70 which is a fluid supply means (see FIG. 10). The expansion part 50 expands when air, which is a fluid, flows from the air pump 70.

  And it has the water level sensor 62 as an expansion | swelling part control means which controls the expansion | swelling amount of the expansion | swelling part 50 in order to control the water level of the waste_water | drain stored in the filtered water separation part 6A. The water level sensor 62 is the same as the water level sensor 62 of the first embodiment, but in this second embodiment, when a predetermined water level is detected by the water level sensor 62, a signal is transmitted to the air pump 70, and the air pump 70 is automatically stopped. It is like that. Since the technology for controlling the driving of the air pump with a sensor is the same as in the first embodiment, the description thereof is omitted.

  The pushing-up force of the entire drainage by expanding the expansion unit 50 is determined in consideration of the respective volumes of the expansion unit 50 and the oil / water separation tank 2, the weight per unit volume of the drainage, the discharge force of the air pump 70, and the like. Further, the apparent increase in the amount of wastewater stored in the oil / water separation tank 2 by the expansion unit 50 is detected by the water level sensor 62, and the expansion rate of the expansion unit 50 is detected by receiving a detection signal from the sensor 62. And the expansion time are adjusted, thereby adjusting the amount of oil discharged.

  The predetermined water level is the same as that in the first embodiment. For example, the water level sensor 62 detects the predetermined water level, and after the predetermined time has elapsed since the detection signal is transmitted, the expansion of the drainage by the expansion unit 50 is stopped. It can be considered.

  The wastewater treatment equipment is considered to differ in the amount of oil and the quality of oil contained in the wastewater depending on the customer who uses it, so how much the water level detected by the water level sensor 62 and the elapsed time of the predetermined time after the water level detection It is thought that usability improves if it can be set for each customer.

  The temporary storage section 7 has a structure in which the suction port 4a of the water discharge pipe 4A for discharging the wastewater stored therein can change its direction. In this way, the dust removal port for removing the dust attached to the water discharge pipe 4A and the open / close lid 41 for closing the dust removal port are unnecessary. When removing dust, the direction of the suction port 4a is rotated as indicated by the arrow A in FIG. 10 so that the suction port 4a faces upward. If it carries out like this, the dust adhering to the suction inlet 4a vicinity of the water discharge pipe 4 can be removed easily.

  Moreover, since the direction of the suction port 4a faces upward as described above, the water stored in the temporary storage unit 7 can be prevented from being discharged out of the tank. It can be said that it has a control means which controls discharging | emitting the water stored by 7 outside the tank.

Next, the effect of the waste water treatment apparatus 1 of Example 2 configured in this way will be described.
Also in the wastewater treatment apparatus 1A of the second embodiment, when the wastewater stored in the oil / water separation tank 2 is left for a while, the oil having a light specific gravity is the upper part of the wastewater stored in the oil / water separation tank 2 as described above. An oil layer is formed at the position, and a water layer is formed with the water located at the lower part.

  When the inflating part 50 is inflated in this state, the amount of stored wastewater is apparently increased according to the amount of expansion, and the wastewater located above the inflating part 50 is raised. When rising above the oil discharge port 32, the oil layer forming the upper layer of the drainage is discharged from the oil discharge port 32 to the outside of the tank in preference to the water layer forming the lower layer. When the oil has been discharged, the raising of the drainage by the expansion part 50 is stopped.

  When storing the wastewater in the oil / water separation tank 2, the air is extracted from the expansion portion 50 and contracted. Accordingly, since the bulk of the oil / water separation tank 2 is reduced, the drainage is stored in the oil / water separation tank 2 correspondingly. After the storage, if air is supplied again by the air pump 70 and the expansion part 50 is expanded, the apparent increase of the wastewater stored in the oil / water separation tank 2 occurs as described above. Therefore, the oil and fat forming the upper layer of the drainage is discharged again from the oil discharge port 32. For this reason, the oil discharge port 32 is formed in the oil / water separation tank 2 and can be said to be a discharge port for discharging oil having a lighter specific gravity than water when the expansion part 50 is expanded.

  For this reason, it is not necessary for the employee to scoop the fats and oils as before. Therefore, the oil and fat contained in the waste water can be easily removed. Further, since the oil and fat can be removed along with the expansion of the inflating portion 50, it is not necessary to interrupt the use in the sink 100, that is, the washing of the tableware containing the oil, for the removal.

  Even in the second embodiment, the solid matter contained in the wastewater flowing into the oil / water separation tank 2 from the wastewater introduction port 31 is removed from the wastewater by the filtration unit 5, so that the solid matter accumulates in the oil / water separation tank 2. It becomes difficult. Therefore, it is possible to prevent the volume of the oil / water separation tank 2 from being reduced due to the accumulation of solid matter.

Since the water that forms the water layer is guided to the temporary storage unit 7 from below the filtered water separation unit 6A, the oil that forms the oil layer located above the filtered water separation unit 6A is relatively free from the temporary storage unit. 7 is difficult to be introduced. In addition, the water forming the water layer is temporarily stored in the temporary storage unit 7 before being discharged out of the tank, and then drained from the drain port 33 provided in the temporary storage unit 7. Emission control is easy.

  Even in the wastewater treatment apparatus 1A, the filtered water separation unit 6A is exclusively provided with the function of separating the wastewater into the oil layer and the water layer, so the filtered water separation unit 6A separates the wastewater into the oil layer and the water layer. It becomes easy to let.

  Furthermore, since it has the water flow path 67 which distribute | circulates the water which forms the said water layer between the temporary storage parts 7 in the lower part of 6 A of filtrate water separation parts, the water layer isolate | separated by the filtrate water separation part 6 is formed. It is the same as the wastewater treatment apparatus 1 of the first embodiment in that the water to be easily guided to the temporary storage unit 7 for a while.

Since the scraper 60 is scraped off by the reciprocating motion of the expanding portion 50 along with the expansion and contraction of the expanding portion 50, the component of the scum is oil and fat. Thus, when the oil layer is removed, the scum is discharged together.
The effect described in this specification can be said to be a problem to be solved by the present invention.

DESCRIPTION OF SYMBOLS 1 Waste water treatment equipment 1A Waste water treatment equipment 2 Oil-water separation tank 4 Water discharge pipe 4a Suction port (control means)
4b Discharge port 5 Filtration unit 6 Filtration water separation unit 7 Temporary storage unit 8 Pre-drain oil removal means 11 Caster 21b Bottom surface 21c Ceiling surface 22b Rear wall 22f Front wall 22l Left wall surface 22r Right wall surface 31 Drain introduction port 32 Oil discharge port 32a Upper side 33 Drain port 41 Opening / closing lid 50 Expanding part 50a Fold 51 Solid matter collecting bowl 53 Separating plate part 54 Zigzag path 60 Scraper 61 Cover (oil layer converging means)
62 Water level detection sensor (water increase amount control means, expansion part control means)
63 Bubble generating device 67 Water flow passage 70 Air pump 81 Oil absorption filter 82 Drive roller 83 Drive roller 84 Claw portion 85 Oil bottle 100 Sink 103 Main body 103a Partition wall 104 Leg 104R Right leg 104L Left leg 105 Drain port 106 Water distribution pipe 107 Backboard 108 Frame 201 Bulkhead 202 Bulkhead 202a Through-hole 203 Guide wall 213 Inlet path 311 Joint pipe 321a Oil receiver 321 Oil catcher 323 Water pipe 531 Separation plate portion forming plate 601 Perimeter 603 Passage port 605 Water flow port 611 Ceiling surface 612 Side surface 613 Cutout 613a Ceiling surface equivalent portion 821 of the cut opening S Handle hollow S1 Inverted half-covered bowl-like space h Dimensional difference between oil outlet and drain outlet

Claims (11)

An oil / water separation tank that stores wastewater containing oil and naturally separates the stored wastewater into an oil layer and a water layer with a specific gravity difference;
An inflatable portion installed in the oil / water separation tank and inflated in the stored wastewater in a state where the wastewater is stored in the oil / water separation tank;
An oil discharge port that is formed in the oil / water separation tank and discharges oil having a lighter specific gravity than water when the expansion portion expands;
A waste water treatment apparatus having a drain outlet for discharging water forming the water layer to the outside of the tank according to the expansion amount of the expansion part.   The waste water treatment apparatus according to claim 1, wherein the expansion portion is connected to a fluid supply unit, and expands when fluid is introduced from the fluid supply unit.   The waste water treatment apparatus according to claim 1 or 2, wherein the inflating part has a bellows shape that expands and contracts in a vertical direction with pleats. The oil / water separation tank includes a filtration unit for filtering solid matter from waste water flowing into the oil / water separation tank;
A filtered water separation unit for storing the drainage filtered by the filtration unit and separating it into the oil layer and the water layer;
A temporary storage unit that guides the water forming the water layer from below the filtered water separation unit, and temporarily stores the guided water before draining it from the oil / water separation tank,
It has a drain for discharging the water stored in this temporary storage part to the outside of the tank,
The waste water treatment apparatus according to any one of claims 1 to 3, wherein the expansion portion and the oil discharge port are provided in the filtered water separation portion.   The wastewater treatment apparatus according to claim 4, further comprising a water flow passage that circulates water that forms the water layer with the temporary storage portion in a lower portion of the filtered water separation portion. The expander is provided with a scraper at its upper end in the expansion / contraction direction for scraping off oil adhering to the inner surface of the oil / water separation tank in contact with the inner surface of the oil / water separation tank,
The waste water treatment apparatus according to claim 4 or 5, wherein the scraper is formed with a passage port through which filtered water filtered by the filtering unit passes through the filtered water separation unit.   The wastewater treatment apparatus according to any one of claims 4 to 6, wherein the drainage port formed in the temporary storage unit is positioned below an oil discharge port formed in the filtered water separation unit. .   The wastewater treatment apparatus according to any one of claims 4 to 7, wherein the drainage port has a control means for controlling discharge of water stored in the temporary storage unit to the outside of the tank. .   The wastewater treatment apparatus according to any one of claims 4 to 8, wherein the filtration unit includes a separation plate for making oil in the drainage easily separated from moisture by colliding the drainage. .   The wastewater according to any one of claims 4 to 9, further comprising an expansion part control means for controlling an expansion amount of the expansion part in order to control a water level of the wastewater stored in the filtrate separation part. Processing equipment. The sink provided with the waste water treatment apparatus of any one of Claims 1-10.

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