JP2001073447A - Grease trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grease trap capable of ideally coping with kitchen drainage containing various kinds of fats and oils, constantly maintaining high fat and oil decomposition efficiency and reducing the purchase cost of fat and oil decomposing bacteria or fat and oil decomposing enzyme. SOLUTION: This grease trap is partitioned into a foreign matter eliminating part 2 provided with a strainer 7 for separating foreign matters in drainage; a fat and oil treatment part 3 comprising a floatation separating part 4 for floatation-separating fat and oil in drainage rid of foreign matters, and a fat and oil decomposing part 5 for decomposing floatation-separated fat and oil with fat and oil decomposing bacteria or fat and oil decomposing enzyme; and a trap part 6 for storing and draining treated water separated from fat and oil. The fat and oil decomposing part 5 is additionally provided with an aeration means and an air lifting mean 11 for circulating lower drainage in the fat and oil decomposing part 5 to the floatation separating part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease strap for treating fats and oils in wastewater containing fats and oils such as kitchen wastewater and food factory wastewater.

[0002]

2. Description of the Related Art Conventionally, wastewater discharged from a commercial kitchen such as a hotel, a ryokan, a restaurant, or a general cafeteria,
Since a lot of garbage and oils and fats are contained, it is required to install a grease strap for removing them. The grease strap generally installed is a contaminant removal unit provided with a strainer for separating contaminants such as garbage in drainage, an oil and fat floating part for floating and separating oil and fat in drainage from the contaminant removal unit, and It has a trap section that stores and discharges wastewater after oil and fat separation from the oil and fat float, but it has a sanitary problem such as intense odor emission and a hotbed for pests such as cockroaches and flies. This causes a problem of clogging of the piping due to the solidified oil and fat.

[0003] The cause of the above-mentioned problem is that oils and fats that have decayed in the tank or whose temperature has decreased and the fluidity has decreased adhere to the tank walls and pipes, adsorb fine contaminants that have passed through the strainer, and cause stagnation for a long time. The major causes are that fats and oils and other organic substances are decomposed by germs and air to generate putrefactive odor and clog pipes.

[0004] In view of the above problems, in recent years, devices for decomposing oils and fats by microorganisms have been developed in order to decompose oils and fats retained in the grease trap. As one example, JP-A-5-346036 discloses a microorganism that degrades fats and oils in a grease trap (referred to as fat-degrading bacteria).
Discloses a grease trap incorporating a grease-decomposition / purification device in which a plurality of braids made of fibrous fibers are arranged in a row, and JP-A-10-137626 discloses a grease trap provided with a grease-splitting bacteria supply device. There is disclosed a processing apparatus for supplying and processing fat-and-oil-decomposing bacteria therein.

[0005]

In the apparatus for decomposing oils and fats by the microorganisms described above, in the invention disclosed in Japanese Patent Application Laid-Open No. Hei 5-346036, it takes a long time for the oil-decomposing bacteria to adhere to and propagate on the braid. At the time of initial operation of the device or at the time of restarting after cleaning, etc., there is a problem that the fat and oil decomposition efficiency is reduced, and it takes a long time to obtain the predetermined efficiency. There is also a risk of killing aerobic fat-decomposing bacteria. Also, Japanese Patent Application Laid-Open No. 10-137
In the invention disclosed in Japanese Patent Publication No. 626, there is no problem as in the above invention because a new fat / oil-decomposing bacterium is supplied by the fat / oil-decomposing bacterium supply device. In the part, the degree of concentration of fats and oils is low, and the supplied fats and oils-decomposing bacteria are diluted by the separated water of the lower layer by aeration and mixed, and excess fat and oil-decomposing bacteria are supplied for the reaction with the floated and separated fats and oils. Is required. Therefore, there is a problem that the cost of the fat-decomposing bacteria is high because the fat-decomposing bacteria are expensive, and since the lower end is open and communicates with the tank at the subsequent stage, the fats and oils and the fat-degrading bacteria are caused by the turbulent flow due to the aeration. It may flow into the tank and be discharged out of the system along with the treated water.

The present invention has been made in view of the problem of a device for decomposing fats and oils by microorganisms in order to decompose the fats and oils retained in the grease trap, and has been made in view of the problem of a kitchen containing various kinds of fats and oils. An object of the present invention is to provide a grease trap that can suitably cope with drainage, can always maintain a high fat and oil decomposition efficiency, and can reduce the cost of purchasing fat and oil degrading bacteria or fat and oil degrading enzymes.

[0007]

The gist of the present invention to achieve the above object is to provide a grease trap for treating fats and oils in wastewater containing fats and oils in the invention according to the first aspect. An impurity removing section provided with a strainer for separating impurities, communicates with the impurity removing section at a lower portion, and communicates at an upper portion with a floating separating section and a floating separating section which floats and separates oils and fats drained from the impurity removing section. The fat and oil processing unit, which is composed of a fat and oil decomposing unit that decomposes fat and oil in the wastewater from the flotation separation unit with fat and oil-decomposing bacteria or a fat and oil decomposing enzyme, communicates with the flotation separation unit at the lower part. And a trap section for storing and discharging treated water. The fat and oil decomposing section has a diffuser means for supplying air, a fat and oil decomposing agent supplying means for supplying lipolytic bacteria or lipolytic enzymes, and a lower layer water for the fat and oil decomposing section. To the flotation section A grease trap, characterized in that annexed the air lift means for.

Further, in the invention described in claim 2, in the grease strap according to claim 1, the two partition walls, each having a lower end opening and forming a communication passage, are divided into three chambers in the flow direction of drainage. Each chamber is provided with a contaminant removal unit, an oil / fat processing unit and a trap unit in the flow direction of the wastewater, and the oil / fat processing unit is further provided with a rectangular notch overflow port at the upper end and the lower end of the two partition walls. The partition wall is extended to the lower end opening and divided into two rooms parallel to the drainage flow direction.
A grease strap, wherein a bottom surface is provided in one of the chambers to form a bottomed chamber, and the other is formed as a bottom-opening chamber, the bottom-opening chamber is a floating separation section, and the bottomed chamber is a grease decomposition section. .

According to the first or second aspect of the present invention, the oil / fat processing unit is connected at the upper part with a flotation / separation unit for levitating / separating the oil / fat and an oil / fat decomposition unit for biodegrading the oil / fat with the oil / fat-decomposing bacteria. By having an air lift means for circulating the lower drainage of the oil and fat decomposition section to the floating separation section,
Since the fat and oil decomposition part and the floating separation part communicate with each other at the upper part, the fat and oil separated by the floating and separation part can flow into the fat and oil decomposition part preferentially. The separated lower layer water is circulated to the floating separation unit by the air lift means, so that the concentrated fats and oils are obtained in the fat and oil decomposition unit. Therefore, the concentrated fats and oils are treated with lipolytic bacteria or lipolytic enzymes (hereinafter referred to as lipolytic agents)
Is supplied, the reaction between the fat and oil and the fat and oil decomposer is efficiently performed, and the fat and oil decomposition efficiency is extremely increased. Furthermore, since the fat and oil decomposing unit is not directly connected to the trap unit for storing and discharging the treated water, there is no danger that the fat and oil or the fat and oil decomposing agent flows out of the system, thereby reducing the cost of purchasing an expensive fat and oil decomposing agent. it can. Further, in the invention described in claim 2, since the inside of the grease strap is efficiently partitioned by the partition wall to form the respective parts, the size of the grease strap can be reduced.

According to the third aspect of the present invention, in the grease trap according to the second aspect, the oil / fat processing unit is provided with two or more grease treatment parts.
A grease strap, wherein a partition wall partitioned into a chamber is bent from a lower end portion of a rectangular notch overflow port at an upper end toward a fat / oil processing unit side to be an inclined bottom surface of a bottomed chamber which is a fat / oil decomposition unit. .

According to the third aspect of the present invention, since the bottom surface of the oil / fat decomposing unit is formed as an inclined bottom surface, the lower opening of the floating separation unit can be maximized, and contaminants can be removed. Since the drainage from the part is prevented from flowing directly into the trap part, the floating separation of the fats and oils is surely performed, and the upper part of the floating separation part becomes narrow,
The floating oil / fat layer becomes thicker, and a thicker oil / fat can flow into the oil / fat decomposition unit. Furthermore, since it is possible to make good contact with air and fat-decomposing bacteria, fats and oils can be decomposed efficiently.

In the above description, the strainer of the contaminant removing section is formed in a cage shape from a wire mesh, a fiber mesh, a nonwoven fabric, a perforated plate, or the like, but is not limited thereto as long as a solid can be separated by filtration. . However, a wire mesh strainer is preferable because it is difficult for oils and fats to adhere and cleaning is easy. The diffuser is preferably a diffuser formed in a cylindrical shape with a porous member such as a synthetic resin or ceramics,
Any device that can supply air during drainage may be used.

Further, in the above, the fat and oil decomposer includes:
Bacillus, Pseudomonu
s), lipolytic bacteria such as Enterobacter and Actinetobacter, lipolytic enzyme preparations such as lipase, and mixed preparations of the above lipolytic bacteria and a surfactant.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective sectional view showing the internal structure of a grease strap according to an embodiment of the present invention, and FIG. 2 is a system diagram of the grease strap of FIG.

1 and 2, reference numeral 1 denotes a rectangular grease trap, which is provided with a drainage introduction pipe 14 for introducing drainage and a treated water discharge pipe 15, and the inside of which is open at the lower end and has a communication passage 17, The two partitions 8 and 9 forming the partition 18 partition the chamber into three chambers in the flow direction of the drainage, and from the drainage inlet 14 side toward the treated water discharge pipe 15 side, the contaminant removal unit 2 and the oil / fat processing unit 3 And a trap portion 6. The fat / oil treating portion 3 further has a rectangular cutout overflow port 16 at the upper end and a lower end extending to the lower ends of the two partition walls 8 and 9. At 10, two chambers are defined in parallel with the flow direction of the waste water, one of the two chambers is provided with a bottom surface to form a bottomed chamber, and the other is formed as a bottom-opening chamber. The bottom chamber is formed as a fat / oil decomposition section 5.

In the above, the impurity removing section 2 is provided with a strainer 7 formed in a cage shape by a wire mesh, a fiber mesh, a non-woven fabric, a perforated plate, or the like.
Is a diffuser 12 of a diffusing means for supplying air to the bottom.
a, an upper portion is provided with a scatter pipe 13a of an oil and fat decomposing agent supply means for supplying an oil and fat decomposing agent and an air lift means 11 for circulating lower layer water to the floating separation section. Further, the treated water discharge pipe 15 provided in the trap section 6 is a T-shaped drain pipe with an open end face for discharging treated water as low as possible.

Further, a partition wall 10 in which the oil / fat processing section 3 is formed in the floating separation section 4 of the bottom open chamber and the oil / fat decomposition section 5 of the bottomed chamber.
Is bent from the lower end of the rectangular notch overflow port 16 at the upper end to the oil / fat decomposing unit 5 side to form a slanted bottom surface of the oil / fat decomposing unit 5; It may be formed as a side surface with a reduced angle and a horizontal bottom surface, or may be formed by connecting them with separate members.

The air diffuser includes a blower 2 for supplying air.
3 and an air supply pipe 12 and a diffuser 12a formed in a cylindrical shape with a porous member such as a synthetic resin or ceramics. The supply pipe 12 is used to control the supply of air to the diffuser 12a and air lift means. A three-way switching valve 24 is provided.

The lipolytic agent supply means comprises a lipolytic agent storage tank 20, an lipolytic agent supply pipe 13, and a spraying pipe 13a. The lipolytic agent supply pipe 13 controls the supply and stop of the lipolytic agent. Open / close control valve 22 is provided.
Further, a control device 21 such as a timer for controlling the operation / stop of the blower 23, the switching of the flow path of the three-way switching valve 24, and the opening / closing of the open / close control valve 22 is provided.

A method for treating oil-containing wastewater such as kitchen wastewater by the grease strap having the above-described structure will be described in detail below. A large amount of oil-containing wastewater discharged from the kitchen during business hours of a restaurant or the like is introduced into the impurity removing unit 2 of the grease trap 1 through the drainage introduction pipe 14, and the impurity is discharged by the strainer 7 provided in the impurity removing unit 2. Is removed and the liquid component flows downward and flows from the lower end communication port 17 of the partition wall 8 into the floating separation section 4 of the oil / fat processing section 3.

The wastewater that has flowed into the flotation / separation unit 4 is separated by flotation of oils and fats while staying in the flotation / separation unit 4, and the separated fats and oils stay on the water surface of the flotation / separation unit 4 and are separated from the partition wall 1.
0 flows from the overflow opening 16 of the rectangular notch into the fat / oil decomposing section 5 and is accumulated. The fats and oils flowing into the fats and oils decomposing section 5 further separate and float the fats and oils while staying,
The separated lower layer water is circulated to the floating separation section by the air lift means 11. The circulation of the lower layer water by the air lift means 11 is such that after the fats and oils have flowed into the fat and oil decomposer 5 from the flotation / separation unit 4 for a predetermined time, the air from the blower 23 is flown by the controller 21 through the flow path of the three-way switching valve 24. Means 11
This is performed by switching to the supply side of air to the air supply unit, and further, by starting the blower 23 by the control device 21 to supply air.

The waste water from which the fats and oils have been separated in the floating separation section 4 is
It flows into the trap part 6 from the lower end communication port 18 of the partition wall 9,
The treated water is discharged from a T-shaped treated water discharge pipe 15 having an open end face to a septic tank or a sewer.

During a time when a restaurant or the like where the discharge of oil-containing wastewater from the kitchen stops is closed, the following operation is performed.
The fats and oils accumulated and accumulated in the fat and oil decomposing section 5 are decomposed.
The controller 21 switches the flow path of the air from the blower 23 to the air supply side of the three-way switching valve 24 to the diffuser 12 a side, and supplies the air from the blower 41 from the diffuser 12 a via the air supply pipe 12.

The control device 21 opens the on-off control valve 22 for a certain period of time while supplying air to the fat and oil decomposing section 5 with the diffuser 12a, so that the fat and oil decomposing agent is supplied from the fat and oil decomposing agent storage tank 20 to the oil and fat decomposing agent supply pipe 13 A predetermined amount is sprayed on the oils and fats retained by the spraying pipe 13a through the spray pipe. The opening time of the opening / closing control valve 22 is determined in advance by predicting the oil and fat content in the waste water and determining a necessary oil and fat decomposing agent, and is set based on the determined oil and fat decomposing agent.

By continuing the air supply from the diffuser 12a for a predetermined period of time, the fats and oils floating and accumulated in the fat and oil decomposing unit 5, the fats and fats adhering to the tank wall, and the like adhered to the fats and oils and the air and fat decomposing bacteria. Alternatively, good contact with the fat / oil decomposing enzyme is performed, and the fat / oil is decomposed efficiently by the action of the fat / oil decomposing agent. The amount of air supplied from the diffuser 12a is set according to the size of the tank of the grease trap 1, but if the amount of air supplied is too small, there is a possibility that an anaerobic state may occur due to lack of oxygen.

It is preferable that the above-mentioned fat and oil decomposition operation is continued until the operation of a restaurant or the like is started and drainage is discharged from the kitchen. Treated water that has been treated and stays in the grease trap 1 is extruded by the introduction of drainage, and is discharged from a treated water discharge pipe 15 provided upright in the trap section 6 to a septic tank or a sewer. In addition, the contaminants captured by the strainer 7 provided in the contaminant removal unit 2 are appropriately taken out together with the strainer 7 and discarded.
After being washed, it is returned to the impurity removing section 2.

[0027]

According to the invention described in claim 1 or 2, since concentrated fats and oils are obtained in the fat and oil decomposing section, the reaction between the fats and oils and the fat and fat decomposing agent is carried out efficiently, and the fat and oil decomposing agent is extremely efficiently decomposed. Increases efficiency. Also, since the fat and oil decomposition unit is not directly connected to the trap unit that stores and discharges treated water,
There is no danger that the fats and oils and the fat and oil decomposer will flow out of the system, and the cost of purchasing expensive fat and oil decomposers can be reduced. Also,
Since the inside of the grease strap is efficiently partitioned by the partition wall and each part is formed, the size of the grease strap can be reduced. Since the opening can be made as wide as possible, the drainage from the contaminant removal unit is prevented from directly flowing into the trap unit, and the floating separation of the fats and oils is surely performed. A thicker fat or oil can flow into the fat or oil decomposition section.

[Brief description of the drawings]

FIG. 1 is a schematic perspective sectional view showing an internal structure of a grease strap according to an embodiment of the present invention.

FIG. 2 is a system diagram of the grease trap of FIG. 1;

[Explanation of symbols]

 1: Grease strap 2: Contaminant removal unit 3: Oil / fat processing unit 4: Floating / separation unit 5: Oil / fat decomposition unit 6: Trap unit 7: Strainer 8, 9: Partition wall 10: Partition wall 11: Airlift means 12a: Diffuser 13a : Spray pipe for fat and oil decomposer 14: Drainage inlet pipe 15: Treated water discharge pipe 16: Overflow port 17, 18: Communication passage

Claims (3)

[Claims] 1. A grease trap for treating oils and fats in wastewater containing oils and fats, wherein the impurity remover provided with a strainer for separating impurities in the wastewater, and a lower part communicates with the impurity remover, and It consists of a flotation unit that floats and separates fats and oils in the wastewater from the removal unit, and an oil and fat decomposition unit that communicates with the flotation separation unit at the top and decomposes the fats and oils in the wastewater from the floatation and separation unit with lipolytic bacteria or lipolytic enzymes. An oil / fat processing unit and a trap unit that communicates at a lower portion with the floating / separating unit and stores and discharges the treated water from which the oil / fat is separated from the floating / separating unit; A grease strap comprising a lipolytic agent supplying means for supplying lipolytic bacteria or a lipolytic enzyme, and an air lift means for circulating lower water of the lipolytic section to the floating separation section. 2. A two-partition wall having an open lower end to form a communication passage is divided into three chambers in the flow direction of drainage, and each chamber is separated in the flow direction of wastewater by a contaminant removal section, an oil / fat processing section, A trap portion, and further, an oil / fat processing portion, wherein a rectangular cutout overflow port is provided at an upper end, and a lower end extends parallel to a flow direction of drainage at a partition wall extending to a lower end opening of the two partition walls. The bottom chamber is provided in one of the two chambers to form a bottomed chamber, the other is formed as a bottom open chamber, the bottom open chamber is a floating separation section, and the bottom chamber is a fat and oil decomposition section. The grease strap according to claim 1, wherein 3. A partition wall for partitioning the oil / fat processing section into two chambers, wherein the partition wall is bent toward the oil / fat processing section side from the lower end of the rectangular notch overflow port at the upper end to form an inclined bottom surface of a bottomed chamber which is an oil / fat decomposition section. The grease strap according to claim 2, wherein: