Method and apparatus for treating wastewater from a grease trap

Abstract

To efficiently convert the wastewater in the grease trap into soapy water. [Solution] The drainage liquid in the grease trap and the saponifying agent supplied to it are agitated and mixed within the grease trap, and ultrasonic vibrations are used to assist in the agitation and mixing of the drainage liquid and the saponifying agent. In addition, the ultrasonic vibrations generate a cavitation phenomenon within the drainage liquid to clean the inside of the grease trap. The agitator and ultrasonic transducer are detachable from the grease trap, making it easy to set the agitator and ultrasonic transducer in the grease trap.

Description

Technical Field

[0001] The present invention relates to a drainage treatment method (to make soap solution) for treating drainage in a grease trap and a drainage treatment apparatus therefor.

Background Art

[0002] In kitchens such as feeding centers, restaurants, hotels, food processing plants, supermarkets, department stores, hospitals, eateries, convenience stores, other cooking places, etc., liquids containing cooking oil, food waste, leftover foods, chopsticks, toothpicks, paper scraps, vinyl scraps, and other garbage (hereinafter, these are referred to as "drainage") are generated daily.

[0003] In Japan, it is prohibited to drain the above-mentioned drainage into sewer pipes and drain pipes. Currently, in feeding centers, restaurants, hotels, food processing plants, etc., the above-mentioned drainage is stored in grease traps installed inside or outside the kitchen.

[0004] A main example of the grease trap A is shown in FIG. 7. The grease trap A in FIG. 7 includes a basket C for collecting the garbage contained in the drainage B discharged from a kitchen or the like, and the drainage B containing the oil and fat component E is made to stay in the grease trap A. The inside of the grease trap A is partitioned by several partition plates D1 and D2. Below the partition plates D1 and D2 is a passage through which the drainage B can pass.

[0005] Drainage B is discharged from a kitchen or the like into the grease trap A. The garbage in the drainage B is collected by the basket C. The drainage B containing the oil and fat component is decelerated in flow rate by the partition plate D1 in the grease trap A and stays in the grease trap A. In this case, the oil and fat component E stays above the moisture (usually containing sludge) F by specific gravity. The moisture F in the grease trap A passes under the partition plate D2 and is gradually discharged into a sewer or a septic tank K through the drainage part G.

[0006] The oil and fat component E accumulated above the moisture F in the grease trap A is mainly a combination of glycerin and fatty acids.

[0007] Besides the type shown in Figure 7, there are various other types of grease traps with different shapes, capacities, structures, and depths. Capacities range from a few liters to tens of liters. Installation methods also vary; for restaurants and school lunch centers, some are installed outside the kitchen, while others are installed under the kitchen floor. There are also floor-standing types that are installed on the floor.

[0008] There are also shallow, very shallow, and deep types. Although the terms "shallow" and "very shallow" don't specify a depth, they generally refer to vessels with a depth of around 25 cm (water depth of around 15 cm), and those shallower than that are called very shallow.

[0009] Because it is difficult to secure space in the kitchen of a convenience store to install a large grease trap, a small liquid storage tank the size of a 18-liter can (hereinafter referred to as a "simple grease trap") is often installed under or next to the sink to collect the wastewater.

[0010] Because the space between floors is narrow in mid-to-high-rise buildings, shallow or very shallow grease traps (hereinafter, both will be collectively referred to as "shallow" or "low-profile") are often installed under the kitchen floor. It is difficult to place a submersible pump inside a shallow grease trap. In some kitchens, it may also be difficult to secure space to install a pump above the floor.

[0011] In reality, grease traps and the wastewater inside them are regularly cleaned (wastewater treatment) by cleaning companies, typically once a week or once a month. However, the current method of regular wastewater treatment involves additional work and costs, as the wastewater must be neutralized with a neutralizing agent after the cleaning company has treated it before being discharged into the sewer or septic tank. Furthermore, the grease trap can become full of wastewater before the next scheduled cleaning date, and this untreated wastewater can flow into drainpipes and sewer lines, causing environmental pollution and foul odors in kitchens.

[0012] In the case of simple grease traps, the capacity is small, so hiring a professional to handle the wastewater disposal is costly. Therefore, employees or part-time staff sometimes handle the wastewater disposal. However, if a simple grease trap is installed under a sink, the limited space under the sink can make wastewater disposal difficult or result in insufficient disposal. [Prior art documents] [Patent Documents]

[0013] To solve the aforementioned problems, the inventors of this invention have developed the grease trap drainage treatment devices described in Patent Documents 1 to 6. These devices draw in the drainage from the grease trap using a pump, and then mix the drainage with a saponifying agent inside the pump to produce a soapy solution. The pump may be installed on the floor, but a submersible pump may also be placed inside the grease trap.

[0014] According to the wastewater treatment devices described in Patent Documents 1 to 6, the wastewater in the grease trap can be converted into a soapy solution and returned to the grease trap, or discharged into drainpipes or sewer pipes. This has advantages such as preventing blockages in these pipes and allowing the grease trap to be cleaned with the soapy solution.

[0015] [Patent Document 1] Japanese Patent Publication No. 2010-149101 [Patent Document 2] Japanese Patent Publication No. 2012-050918 [Patent Document 3] Japanese Patent Publication No. 2012-106247 [Patent Document 4] Japanese Patent Publication No. 2012-223767 [Patent Document 5] Japanese Patent Publication No. 2013-146686 [Patent Document 6] Japanese Patent Publication No. 2013-208616

[0016] The wastewater contains oil and grease. Because oil and grease float on top of water due to their specific gravity, in order to efficiently convert the oil and grease in the grease trap into soapy water, it is sufficient to treat the wastewater from the upper part of the grease trap. However, among the wastewater treatment devices described in the above-mentioned Patent Documents 1 to 6, the type that involves inserting a hose into the wastewater in the grease trap and pumping it up inevitably pumps up a large amount of water from the lower part of the wastewater. As a result, the amount of wastewater that is stirred and mixed by the pump becomes large, making it difficult to efficiently convert the oil and grease floating in the upper part of the wastewater in the grease trap into soapy water.

[0017] Among the drainage treatment devices described in the above Patent Documents 1 to 6, the type that involves placing a pump inside the grease trap sometimes presents difficulties in installing the pump, or even makes it impossible to install the pump, especially in cases where the grease trap is a low-profile type or a simple type. [Overview of the project] [Problems that the invention aims to solve]

[0018] The problem to be solved by the present invention is to provide a method and apparatus for treating grease trap wastewater that can efficiently convert wastewater in a grease trap into soapy water, and is suitable not only for treating wastewater in grease traps of normal depth, but also for treating wastewater in shallow grease traps and simple grease traps. [Means for solving the problem]

[0019] The present invention relates to a method for treating grease trap wastewater, which involves adding a saponifying agent to the wastewater in the grease trap, stirring and mixing it with a stirrer, and using ultrasonic vibrations to generate and burst bubbles (hereinafter sometimes referred to as "cavitation") to facilitate the stirring and mixing of the wastewater and the saponifying agent, thereby producing a soapy solution (including an emulsified solution). In this invention, a microbial activator can also be added to the wastewater and stirred and mixed, or a liquid or high-pressure liquid can be sprayed into the wastewater while stirring and mixing.

[0020] The drainage treatment device for the grease trap of the present invention is equipped with a stirrer capable of stirring and mixing the drainage in the grease trap and a saponifier, and is equipped with an ultrasonic vibrator that generates a cavitation phenomenon by ultrasonic vibration in the drainage containing the saponifier in the grease trap. The ultrasonic vibrator can be fixed to the wall surface or partition plate of the grease trap, or can be detachable. An amplifier for amplifying the ultrasonic vibration generated from the ultrasonic vibrator can also be provided. The ultrasonic vibrator may be the ultrasonic vibrator of an ultrasonic disperser (ultrasonic homogenizer). In any case, the ultrasonic vibrator is arranged so that a cavitation phenomenon occurs in the drainage in the grease trap. It may also be equipped with a liquid injection device capable of injecting bubble liquid or high-pressure bubble liquid into the drainage containing the saponifier in the grease trap.

Effects of the Invention

[0021] The drainage treatment method for the grease trap of the present invention has the following effects. (1) The drainage in the grease trap and the saponifier are stirred by a stirrer, and the stirring and mixing of the drainage and the saponifier are assisted by the cavitation phenomenon caused by ultrasonic vibration, so that the drainage can be easily saponified. (2) The ultrasonic vibration decomposes (disperses) lumps such as dust, food residues, and oil and fat components in the drainage in the grease trap (hereinafter referred to as "lumps in the drainage"), and also peels off dirt and the like adhering to the peripheral wall and partition plate of the grease trap. (3) When a microbial activator is added to the drainage, the oil and fat components in the drainage are decomposed by the microbial activator, so that the drainage is easily saponified. (4) When liquid or high-pressure liquid is injected into the drainage, the stirring and mixing are promoted.

[0022] The drainage treatment device for the grease trap of the present invention has the following effects. (1) The drainage in the grease trap and the saponifier can be stirred and mixed into a soap solution, and the stirring and mixing can be assisted by the ultrasonic vibration from the ultrasonic vibrator, so that the drainage is easily saponified. (2) The ultrasonic vibration decomposes (disperses) the lumps in the drainage in the grease trap, and also peels off dirt and the like adhering to the peripheral wall and partition plate of the grease trap. (3) The wastewater containing the saponifying agent can be stirred and mixed by spraying it with liquid or high-pressure liquid, making it easy to liquefy into soap. (4) The wastewater in the grease trap can be converted into soapy water without the use of a submersible pump. [Brief explanation of the drawing]

[0023] [Figure 1] An explanatory diagram showing a first example of a grease trap wastewater treatment method and wastewater treatment apparatus according to the present invention. [Figure 2] An explanatory diagram showing a second example of a grease trap drainage treatment method and drainage treatment apparatus according to the present invention. [Figure 3] An overall diagram illustrating a third example of a grease trap drainage treatment method and drainage treatment apparatus according to the present invention. [Figure 4] An explanatory diagram of an ultrasonic transducer and agitator in a third example of a grease trap drainage treatment method and drainage treatment apparatus of the present invention. [Figure 5] (a) and (b) are internal layout diagrams of different examples of the drainage treatment device shown in Figure 4. [Figure 6] Figure 4 is an explanatory diagram of the installation of a stirrer in the wastewater treatment device. [Figure 7] A diagram illustrating a general-purpose grease trap. [Modes for carrying out the invention]

[0024] (Embodiment 1 of a method for treating grease trap wastewater) The present invention provides a method for treating grease trap wastewater, as shown in Figure 1. This method involves adding a saponifying agent H to the wastewater B in grease trap A, and then stirring and mixing the wastewater B and saponifying agent H with the rotation of a stirrer 5 to create a soapy liquid. At this time, ultrasonic vibrations generated from an ultrasonic transducer 1 vibrate the wastewater B, assisting the stirring and mixing of the wastewater B and saponifying agent H by the stirrer 5 to create a soapy liquid. The ultrasonic vibrations generated from the ultrasonic transducer 1 also generate bubbles 2 in the wastewater B, and the bursting of these bubbles 2 (bubble generation and bursting: cavitation phenomenon) can clean the dirt in grease trap A or break down (disperse) clumps of wastewater B in grease trap A.

[0025] [Grease trap] The grease trap in this invention may have any shape or structure. Grease trap A in Figure 1 is just one example and is similar to a general-purpose grease trap A (Figure 7).

[0026] [Saponifying agent] The saponifying agent H used in this invention can chemically react with the oil and fat E and water F in the grease trap A to convert them into fatty acids (separated from glycerin) and form a soap solution. It is a general-purpose saponifying agent and includes various processing agents such as emulsifiers, detergents, and surfactants.

[0027] [Mixing ratio of drainage liquid and saponifying agent] The mixing ratio of wastewater B and saponifying agent H in grease trap A is preferably around 5:1 in terms of saponification efficiency and cost, but this ratio can be changed depending on the degree of contamination of wastewater B, the amount of oil and fat E, and the composition of the oil and fat. If the wastewater B is heavily contaminated or the amount of oil and fat E is high, the amount of saponifying agent H can be increased compared to the above ratio, and if the wastewater B is lightly contaminated or the amount of oil and fat E is low, the amount of saponifying agent H can be decreased compared to the above ratio.

[0028] [Ultrasonic transducer] The ultrasonic transducer 1 may be a general-purpose one, or it may be the ultrasonic transducer (commonly called a tip) 1 of an ultrasonic disperser (commonly called an ultrasonic homogenizer). If a general-purpose ultrasonic transducer 1 is used, it can be attached to the bottom surface L of the grease trap A, or to one or more of the partition plates D1 and D2. In either case, it is best to enclose it in a case (not shown) so that it does not become submerged in the drainage liquid B inside the grease trap A.

[0029] If the ultrasonic transducer 1 is the ultrasonic transducer 1 of an ultrasonic homogenizer, the pipe-shaped insertion part (not shown) of the ultrasonic homogenizer can be inserted (immersed) into the drainage liquid B of the grease trap A for use.

[0030] [Ultrasonic vibration] By generating ultrasonic vibrations from the ultrasonic transducer 1, the wastewater B in grease trap A is vibrated, which assists the stirring and mixing of wastewater B and saponifying agent H by the agitator 5. Cavitation occurs, which cleans the inside of grease trap A.

[0031] The frequency and intensity (power) of the ultrasonic vibrations generated from the ultrasonic transducer 1 are set to facilitate the mixing of the drainage liquid B and the saponifying agent H due to the cavitation phenomenon.

[0032] Bubbles 2 may be generated in any of the following locations within grease trap A: within the water F, within the oil E, or near the boundary between water F and oil E; they may also be generated in two or more locations. It is best to generate them in the location where cavitation is most likely to occur.

[0033] [Soap solution] In this invention, "to make a soap solution" or "to liquefy a soap solution" means to convert oils and fats into fatty acids through a chemical reaction (separating them from glycerin) to create a soap solution. By converting oils and fats into fatty acids, the biodegradability is significantly increased compared to the oils and fats themselves. The soap solution in this invention is not necessarily a fully saponified soap solution, but also includes an emulsified state.

[0034] The agitated and mixed liquid hits the partition plate D2, diffuses into the grease trap A, and flows out through the drainage section G to the external sewer or septic tank K.

[0035] (Embodiment 2 of the grease trap drainage treatment method: Addition of microbial activator) In the grease trap wastewater treatment method of the present invention, a microbial activator can also be added to the wastewater B in grease trap A. The microbial activator is capable of decomposing the oil and fat E in the wastewater B in grease trap A, and examples include soil bacteria, lactic acid bacteria, yeast, and other microorganisms.

[0036] (Embodiment 3 of the method for treating grease trap wastewater) The present invention relates to a grease trap wastewater treatment method in which, when the wastewater B and saponifying agent H are stirred and mixed by cavitation, a liquid (not shown) can also be injected into the wastewater B in the grease trap A, and the wastewater B and saponifying agent H in the grease trap A can be stirred and mixed by the injection pressure (water pressure: water force). It is suitable to inject the liquid in the form of nanobubbles or microbubbles. Alternatively, high-pressure nanobubbles or high-pressure microbubbles (high-pressure liquid) can be injected by pressurizing these. The injection point may be any point in the wastewater B.

[0037] (Embodiment 1 of a grease trap drainage treatment device) The grease trap drainage treatment device of the present invention is equipped with a stirrer 5 (Figures 1 and 2) that can agitate the drainage B in the grease trap A with the saponifying agent H placed therein. It also includes an ultrasonic transducer 1 that ultrasonically vibrates the drainage B. The ultrasonic transducer 1 is housed in a case (not shown) so that it is not submerged in the drainage B.

[0038] [Agitator] The agitator 5 mixes the wastewater B and the saponifying agent H, and its agitator blade (propeller) is rotated by the motor M (Figure 1) to agitate the wastewater B in the grease trap A.

[0039] [Ultrasonic transducer] The ultrasonic transducer 1 may be a general-purpose one, or it may be the ultrasonic transducer (tip) 1 of an ultrasonic disperser (ultrasonic homogenizer). In either case, it can be placed anywhere in the grease trap A as long as it can vibrate the drainage liquid B and generate cavitation.

[0040] As an example, in Figure 1, a general-purpose ultrasonic transducer 1 is attached to partition plates D1 and D2 of grease trap A, and is also inserted into the drainage liquid B of grease trap A. The ultrasonic transducer 1 can also be attached to one or more locations on partition plates D1 and D2. In any case, it is preferable to house the ultrasonic transducer 1 in a case (not shown) so that it is not submerged in the drainage liquid B of grease trap A. When a high-frequency signal is applied to the ultrasonic transducer 1 from a high-frequency oscillator (OS) 3 located outside grease trap A, it generates ultrasound, which can vibrate the drainage liquid B of grease trap A. The ultrasound is also designed to generate bubbles 2 in the drainage liquid B, causing a cavitation phenomenon.

[0041] [Ultrasonic homogenizer] An ultrasonic homogenizer (not shown) has a pipe-shaped insertion part, and an ultrasonic transducer 1 is built into the insertion part. When a high-frequency signal is applied from a high-frequency oscillator 3, it vibrates ultrasonically. When using the ultrasonic homogenizer, the main body equipped with the high-frequency oscillator 3 is placed outside the grease trap A, and the insertion part is inserted into the drainage liquid B of the grease trap A, so that the ultrasonic vibration of the ultrasonic transducer 1 inside the insertion part can vibrate the drainage liquid B. It can also generate bubbles 2 and cause cavitation, where the bubbles 2 burst.

[0042] [Cavitation phenomenon caused by ultrasonic transducers] When the ultrasonic transducer 1 vibrates ultrasonically, tiny bubbles 2 (μm, nm size) are generated in the drainage liquid B of grease trap A, and a cavitation phenomenon occurs when these bubbles 2 burst. This bursting of bubbles 2 facilitates the stirring and mixing of the drainage liquid B and the saponifying agent H added to it. In addition, the ultrasonic vibrations separate (detach) dirt adhering to the perimeter walls and partition plates D1, D2, etc. of grease trap A, thus cleaning the perimeter walls and partition plates D1, D2, etc. The clumps of drainage liquid B are dispersed, making it easier to stir and mix with the saponifying agent.

[0043] [Attaching to the base] As shown in Figure 1, the ultrasonic transducer 1 can be mounted on the base 7 together with the agitator 5. The base 7 is detachable from the peripheral wall or partition plates D1 and D2 of the grease trap A. In Figure 1, the high-frequency oscillator (OS) 3 and agitator 5 of the ultrasonic homogenizer are mounted on the base 7, which is detachable from partition plates D1 and D2. When the base 7 is placed on partition plates D1 and D2, the agitator 5 is immersed in the drainage liquid B inside the grease trap A. The base 7 may be made of a plate or other shape, as long as it can accommodate the ultrasonic transducer 1 and agitator 5. The agitator 5 can be mounted vertically on the base 7 as shown in Figure 1, or horizontally as shown in Figure 2.

[0044] The base 7 may be height-adjustable so that the agitator 5 is positioned within the drainage liquid B, or the mounting height of the base 7 may be constant, and the mounting positions of the ultrasonic transducer 1 and agitator 5 on the base 7 may be adjustable.

[0045] [Bubble liquid, high-pressure bubble liquid] In the present invention, when the wastewater B and saponifying agent H are stirred and mixed in the stirrer 5, a liquid injection device (not shown) can be provided that injects a microbubble or nanobubble liquid, or a high-pressure bubble liquid obtained by pressurizing it, into the wastewater B in the grease trap A to stir and mix the wastewater B and the saponifying agent H. The liquid injection device may, for example, be provided with a nozzle (not shown) in a pipe (not shown) located above the grease trap A, and when the bubble liquid or high-pressure bubble liquid is supplied to the pipe, the bubble liquid or high-pressure bubble liquid is ejected from the nozzle. The bubble liquid or high-pressure bubble liquid may contain a saponifying solution and / or a microbial activator.

[0046] Although not shown in the diagram, power supply cords are wired to the high-frequency oscillator (OS) 3, the motor M of the agitator 5, etc.

[0047] [Control equipment] In this invention, the timing and amount of saponifying agent H added to the wastewater B in grease trap A, as well as the operating timing and duration of the agitator 5, can be set, adjusted, and controlled by a control device (not shown). The amount and timing of saponifying agent H added, the operating timing and duration of the agitator 5, etc., can be controlled according to the amount and properties of wastewater B in grease trap A, the type and properties of saponifying agent H, etc.

[0048] The saponifying agent H can be automatically added, for example, once or several times a day at predetermined times, and the amount added each time can also be set arbitrarily. The agitator 5 can be automatically operated, for example, once or several times a day at predetermined times for a set operating time. The timing of the operating time can be set to a fixed time every few days, or when a sensor detects that the amount of wastewater B from grease trap A has reached a predetermined level. The timing and amount of microbial activator added are adjusted according to the amount of wastewater B from grease trap A and the composition of oils and fats.

[0049] The control device allows for the setting, adjustment, and control of various other conditions. By changing the settings of the frequency, amplitude, and output (intensity: power) of the high-frequency voltage emitted from the high-frequency oscillator 3, it is possible to change the frequency and intensity (power) of the ultrasonic vibrations generated from the ultrasonic transducer 1, as well as the size, number, density, and bursting strength (power) of the bubbles 2 generated in the drainage liquid B. It is also possible to amplify the high-frequency voltage emitted from the high-frequency oscillator 3 to increase the output (intensity: power) of the ultrasonic transducer 1.

[0050] [Microbial Activators] In this invention, microbial activators (liquid, solid, etc.), EM bacteria, enzymes, etc. can also be added to the wastewater B of grease trap A. Suitable microbial activators are microorganisms that can contribute to the saponification of wastewater B, such as soil microorganisms or other microorganisms. Commercially available microorganisms, EM bacteria, enzymes, etc. can be used. Liquid forms are suitable for supplying into wastewater B in grease trap A. By adding these microorganisms, EM bacteria, enzymes, etc., the decomposition and saponification of the oil and fat E in wastewater B in grease trap A are promoted.

[0051] (Embodiment 2 of a grease trap drainage treatment device) The drainage device for the grease trap of the present invention may be as shown in Figure 3. This drainage device can be detachably hung (locked) on the partition plate D1 of the grease trap A. Base 7 A box-shaped enclosure 11 is attached to it.

[0052] As shown in Figure 4, the housing 11 contains a motor M, a rotating body 12, and an ultrasonic transducer 1. An agitator 5, a handle 16, and a support part 17 are attached to the outside of the housing 11.

[0053] It protrudes from the top of the casing 11. Base 7 (Figure 3) shows that when the housing 11 is secured on the partition plate D1 of grease trap A, it is positioned inside grease trap A, and the stirring blades (propellers) 18 of the agitator 5 are at a height that allows them to be submerged in the drainage liquid B inside grease trap A.

[0054] As shown in Figure 4, the rotating body 12 and the ultrasonic transducer 1 are arranged side by side inside the housing 11. The motor M is fixed inside the housing 11, and the rotating body 12 is connected to the rotation shaft 13 of the motor M so that it rotates when the motor M rotates. The rotating body 12 is disc-shaped, and several magnets 14 are attached to its front circumferential direction.

[0055] The agitator 5 has a disc-shaped base 20 at the end of a rotating shaft 19, a triangular pyramidal rotating part 21 at the end of the base 20, and a propeller 18 attached to the end of the rotating part 21.

[0056] A magnet 22 is attached to the back of the base 20. This magnet 22 has the opposite polarity (S / N) to the magnet 14 of the rotating body 12 inside the housing 11, so that when the rotating body 12 rotates, it repels the magnet 14 of the rotating body 12 and rotates (rotates using a magnetic drive system). Rotation using a magnetic drive system is just one example. As another example, the rotating shaft 19 of the agitator 5 can be directly connected to the motor M, so that when the rotating body 12 rotates due to the rotation of the motor M, the base 20 rotates and the propeller 18 rotates.

[0057] The base 20 is shaped like a screw by providing a stirring mechanism 23, such as spiral blades or spiral grooves, on its outer surface. The stirring mechanism 23 can stir the wastewater B in the grease trap A as the rotating part 21 rotates in conjunction with the rotation of the propeller 18.

[0058] [Ultrasonic transducer] The ultrasonic transducer 1 in Figure 4 is mounted inside a box-shaped housing 11. The outer circumference of the ultrasonic transducer 1 is surrounded by a horn-shaped case 24 as shown in Figure 5(a). The case 24 can also be designed to resonate with the ultrasonic vibrations generated from the ultrasonic transducer 1. The housing 11 can be made rigid to facilitate the transmission of vibrations from the ultrasonic transducer 1.

[0059] [Control device] The control device 25 in Figure 3 controls the operation of the motor M, the operation of the agitator 5, the frequency and power of the high-frequency signal supplied to the ultrasonic transducer 1, and the operating timing and duration of the saponifying agent pump (not shown) that sucks and discharges the saponifying agent H in the saponifying agent container 26, thereby controlling the suction timing and amount of saponifying agent H, as well as the discharge timing and amount of the suctioned saponifying agent H.

[0060] A handle 16 for convenient carrying is attached to the top surface of the housing 11 in Figure 3. There is also a support section 17 (Figure 6) on the top surface of the housing 11. The support section 17 is semicircular in front view so that the saponifying agent discharge hose 28 (Figure 3) drawn out from the control device 25, or the nozzle 29 connected to the end of the saponifying agent discharge hose 28, can be inserted into it.

[0061] (Embodiment 3 of a grease trap drainage treatment device) In the grease trap drainage treatment device of the present invention, as shown in Figure 5(b), the ultrasonic transducer 1 can be mounted on the outer surface of a box-shaped housing 11. In this case, the ultrasonic transducer 1 is enclosed in a horn-shaped case 24 so that the drainage liquid B from the grease trap A does not enter the case 24 and the ultrasonic transducer 1 does not become submerged in the drainage liquid B. In this case as well, it is desirable that the housing 11 be rigid so that the vibrations of the ultrasonic transducer 1 are easily transmitted. [Industrial applicability]

[0062] The above-described embodiment is a main example for solving the problems of the present invention. The present invention is design-modifiable to the extent that it solves the problems, and other equipment can be added or replaced. When a microbial activator is introduced into the wastewater B in grease trap A, a microbial introduction device can be provided outside grease trap A. [Explanation of symbols]

[0063] 1. Ultrasonic transducer 2 bubbles 3. High-frequency oscillator (OS) (of an ultrasonic homogenizer) 5 Stirrer 7 Base 11 cabinets 12. Solids of revolution 13 (Motor) Rotation shaft 14 Magnets 16 handle 17 Support part 18. Agitator blades (propellers) 19. Rotating shaft (of the agitator) 20 bases 21 Rotating part 22 Magnets 23 Stirring mechanism 24 cases 25 Control device 26. Saponifying agent container 28 Saponifier discharge hose 29 nozzles A grease trap B Drainage C Basket D1, D2 partition plates E Oil content F Moisture G Drainage section H saponifier L (Grease trap) bottom M Motor K Sewerage / Septic Tank

Claims

1. A saponifying agent that can be mixed with the wastewater to form a soapy solution is added to the wastewater in the grease trap discharged from the kitchen or food preparation area. An agitator, in which the motor is located inside the housing and the agitator blades are mounted outside the housing, rotatably and horizontally, is placed in the drainage liquid inside the grease trap with the agitator blades facing horizontally. In the aforementioned configuration, the motor is rotated continuously for a predetermined time to continuously rotate the stirring blade, and the continuous rotation of the stirring blade continuously stirs and mixes the wastewater and the saponifying agent to convert the wastewater into a soapy solution. During the stirring and mixing process, ultrasonic vibrations are generated from an ultrasonic transducer into the drained liquid to assist the stirring and mixing. By continuously performing the aforementioned stirring, mixing, and assisting, the wastewater in the grease trap is converted into a soapy liquid. A method for treating wastewater from a grease trap, characterized by the following features.

2. In the method for treating drainage from a grease trap according to Claim 1, During the stirring and mixing of the wastewater and saponifying agent, bubbles are generated in the wastewater from an ultrasonic transducer, and the cavitation phenomenon caused by the bursting of these bubbles assists in the stirring and mixing of the wastewater and saponifying agent, thereby cleaning the grease trap. By performing the aforementioned cavitation phenomenon continuously, the assistance and washing are performed continuously. A method for treating wastewater from a grease trap, characterized by the following features.

3. In the method for treating drainage from a grease trap according to Claim 1 or Claim 2, The height of the agitator's blades, which are placed inside the grease trap's drainage, is adjusted to be at the same height as the oily portion at the top of the drainage in the grease trap, or at another height, and the agitator's blades are rotated to agitate and mix the drainage with the saponifying agent. A method for treating wastewater from a grease trap, characterized by the following features.

4. In the method for treating drainage from a grease trap according to Claim 1 or Claim 2, The height of the ultrasonic transducer and the height of the agitator impeller placed in the grease trap's drain are adjusted to be at or near the level of the oily layer at the top of the drain in the grease trap. The agitator impeller is rotated to agitate and mix the drain and saponifying agent, and ultrasonic vibrations are generated from the ultrasonic transducer to assist in the agitation and mixing and to clean the grease trap. A method for treating wastewater from a grease trap, characterized by the following features.

5. A wastewater treatment device equipped with a stirrer capable of mixing wastewater from a grease trap discharged from a kitchen or food preparation area with a saponifying agent added to the wastewater to produce a soapy solution. The wastewater treatment device is equipped with a stirrer and an ultrasonic transducer. The agitator has a motor inside the housing, and the agitator blades are mounted outside the housing, positioned laterally and rotatably. The agitator blade is positioned horizontally within the drainage fluid when the housing is placed inside the grease trap's drainage fluid, and rotates continuously when the motor rotates for a predetermined time, allowing for continuous agitation and mixing of the drainage fluid and the saponifying agent added to it. During the stirring and mixing process, the ultrasonic transducer can generate ultrasonic vibrations within the drained liquid in the grease trap, causing the drained liquid and saponifying agent to vibrate and assist in the stirring and mixing process. By continuously performing the aforementioned stirring, mixing, and assistance for a predetermined time, the wastewater in the grease trap can be converted into a soapy liquid. A drainage device for a grease trap, characterized by the following features.

6. In the grease trap drainage treatment apparatus according to Claim 5, The ultrasonic transducer generates bubbles in the wastewater during the stirring and mixing of the wastewater and saponifying agent. The cavitation phenomenon caused by the bursting of these bubbles assists in the stirring and mixing of the wastewater and saponifying agent, thereby cleaning the grease trap. By performing the cavitation phenomenon continuously, the assistance and washing can be performed continuously. A drainage device for a grease trap, characterized by the following features.

7. In the grease trap drainage treatment apparatus according to claim 5 or claim 6, The casing is connected to the base. The base is a housing placed within the drainage liquid of the grease trap, and the height of the agitator blade can be adjusted by adjusting the height of the housing to the level of the oily substance at the top of the drainage liquid in the grease trap, or to another height. The agitator rotates at an adjustable height, allowing for the mixing of the wastewater and saponifying agent. A drainage device for a grease trap, characterized by the following features.

8. In the grease trap drainage treatment apparatus according to claim 5 or claim 6, The ultrasonic transducer is connected to the base. The base allows for adjustment of the height of the ultrasonic transducer, which is placed in the drainage fluid within the grease trap. The ultrasonic transducer can generate ultrasonic vibrations at an adjustable height. A drainage device for a grease trap, characterized by the following features.

9. In the grease trap drainage treatment apparatus according to claim 5 or claim 6, The grease trap has a saponifying agent container outside, and is equipped with control equipment that can automatically dispense the saponifying agent from the container into the drainage liquid inside the grease trap, rotate and stop the agitator motor, control the continuous rotation time of the motor, and generate and stop ultrasonic vibrations from the ultrasonic transducer. A drainage device for a grease trap, characterized by the following features.

10. In the grease trap drainage treatment apparatus according to claim 5 or claim 6, The enclosure has a handle on top for carrying it. The handle is mounted on the housing so that it protrudes above the drainage fluid, even when the agitator blade is positioned within the drainage fluid of the grease trap. A drainage device for a grease trap, characterized by the following features.

11. In the grease trap drainage treatment apparatus according to claim 5 or claim 6, The casing has a support section, The support section is capable of supporting a nozzle connected to the end of a saponifier discharge hose that supplies saponifier from a saponifier container outside the grease trap into the grease trap, and is provided in the housing so as to protrude above the drainage liquid even when the agitator blade is positioned to be submerged in the drainage liquid inside the grease trap. A drainage device for a grease trap, characterized by the following features.

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