Grease trap wastewater treatment method and wastewater treatment device

Abstract

To efficiently turn oil and fat in drained liquid into soapy liquid. [Solution] The wastewater treatment method involves pumping up the wastewater in a grease trap with a pump placed inside the wastewater, stirring and mixing the wastewater with a saponifying agent, discharging the mixture into the wastewater in the grease trap, and repeating this process of pumping, stirring and mixing, and discharging to produce a soapy solution. The wastewater treatment device includes a pump placed inside the wastewater in the grease trap and a discharge hose connected to the pump's discharge port. A control unit can also be provided to control the start and stop of the pump, the amount pumped, the pumping timing, etc.

Description

[Technical Field]

[0001] The present invention relates to a wastewater treatment method and wastewater treatment device for treating wastewater in grease traps and wastewater tanks installed inside or outside kitchens and other cooking areas of various facilities such as food service centers, restaurants, hotels, food processing plants, supermarkets, department stores, and hospitals. [Background technology]

[0002] In kitchens such as school lunch centers, restaurants, hotels, food processing plants, supermarkets, department stores, hospitals, and restaurants, cooking oil, food waste, leftover food, chopsticks, toothpicks, paper scraps, plastic scraps, other garbage, and the liquids that accompany them (hereinafter referred to as "waste liquids") are generated on a daily basis.

[0003] In Japan, it is prohibited to discharge the wastewater into sewer pipes or drain pipes, so currently the wastewater is collected in a storage tank (grease trap) installed inside or outside the kitchen, and the wastewater in the grease trap is cleaned by a cleaning company on a regular basis, for example, once a week or once a month.In addition to grease traps, simple grease traps that collect wastewater and wastewater tanks with other configurations are also sometimes used.

[0004] Grease traps, simple grease traps, wastewater tanks, etc. (hereinafter collectively referred to as "grease traps") are regularly treated. With the current regular wastewater treatment method, after the cleaning company treats the wastewater, it must be neutralized with a neutralizing agent before being discharged into the sewer or septic tank, which requires secondary work and expenses, resulting in high costs. In addition, the grease trap may become full with wastewater before the next scheduled cleaning date, and the wastewater may flow into the drain pipe or sewer pipe untreated, causing environmental pollution and foul odors in the kitchen.

[0005] The inventors of this application have previously developed a grease trap wastewater treatment device as shown in Patent Documents 1 to 6. This device uses a pump to suck out wastewater from the grease trap, and then agitates and mixes the wastewater with a saponifying agent inside the pump to produce a soapy solution.

[0006] According to the wastewater treatment devices of Patent Documents 1 to 6, the wastewater in the grease trap can be turned into soapy liquid and returned to the grease trap or poured into drain pipes or sewer pipes, which has the advantage that these pipes are less likely to clog and the grease trap can be cleaned with the soapy liquid. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-149101 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-050918 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-106247 [Patent Document 4] Japanese Patent Application Laid-Open No. 2012-223767 [Patent Document 5] Japanese Patent Application Laid-Open No. 2013-146686 [Patent Document 6] Japanese Patent Application Laid-Open No. 2013-208616 Summary of the Invention [Problem to be solved by the invention]

[0008] The wastewater contains oil and fat, which floats on water due to its specific gravity. However, the wastewater treatment devices described in the above Patent Documents 1 to 6 do not use a hose to connect the wastewater in the grease trap. of Because the wastewater is pumped up with a pump, a large amount of water at the bottom of the wastewater is inevitably pumped up. This means that a large amount of wastewater needs to be stirred and mixed by the pump, making it difficult to efficiently turn the oils and fats in the wastewater into soapy water. [Means for solving the problem]

[0009] The present invention provides a method and apparatus for treating effluent from a grease trap, which can efficiently convert effluent, particularly oil and fat content, from a grease trap into a soapy liquid (including an emulsified liquid state).

[0010] The method for treating grease trap effluent of the present invention involves pumping the effluent from the grease trap, primarily oils and fats (including water), with a pump, such as a submersible pump, placed in the effluent, stirring and mixing the effluent and a saponifying agent within the pump, discharging the stirred and mixed mixture (in-progress saponification liquid) into the effluent from the grease trap, and repeatedly pumping, stirring, mixing, and discharging the effluent from the grease trap to turn it into a soapy solution. It is desirable to pump up the oils and fats floating to the top of the effluent with the pump. The saponifying agent can be added to the effluent in the grease trap before pumping, or it can be added to the pump during pumping.

[0011] The grease trap wastewater treatment device of the present invention includes a pump, such as a submersible pump, placed in the wastewater in the grease trap, and a discharge hose that discharges the mixture agitated and mixed with a saponifying agent in the pump into the wastewater in the grease trap. The pump agitates and mixes the pumped wastewater with the saponifying agent, and the discharge hose is connected to the discharge port of the pump. The submersible pump agitates and mixes the pumped wastewater with the saponifying agent to form a mixture, which can then be discharged.

[0012] The pump should be located at the top of the drainage in the grease trap (near the floating grease). The pump should be height adjustable so that the pumping point is at the same level as the grease. [Effects of the Invention]

[0013] The method for treating grease trap effluent of the present invention has the following effects. (1) The drainage liquid in the grease trap, mainly oil and grease, can be efficiently converted into soapy liquid. (2) Because the wastewater can be turned into soapy water before being poured into the sewer or septic tank, there is no problem of clogging the sewer or polluting the environment due to oil and grease, as occurs when oil-containing wastewater is poured directly into the sewer. (3) The soapy solution makes it easy to remove dirt from grease traps and septic tanks, and discharging the soapy solution also cleans grease from sewer pipes and sewers, helping to keep grease traps and kitchens hygienic. (4) The soap solution obtained by stirring and mixing the saponifying agent can be used to clean the inner walls and edges of the grease trap, and can also be used to clean scum stains from the walls of the grease trap.

[0014] The grease trap wastewater treatment device of the present invention has the following effects. (1) Since the pumping pump is placed inside the wastewater, there is no need to secure space around the grease trap to install the pumping pump, and wastewater treatment can be performed even in a small space. (2) The pump is provided with a height-adjustable support, which makes it easier to align the installation position of the pumping part of the pump with the position of the grease in the drained liquid, and the grease can be mainly pumped up and efficiently made into soapy liquid. (3) By placing a pump in the drainage and operating it, the drainage can be automatically pumped up and liquefied into soap, allowing for easy and rapid drainage treatment. (4) The height of the pumping pump can be adjusted, so even if the level of the wastewater in the grease trap drops due to pumping, the oil and grease content in the remaining wastewater in the grease trap can be efficiently pumped up, making it possible to treat the wastewater whether the grease trap is deep or shallow. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view of the grease trap wastewater treatment device of the present invention, in which a pumping pump is disposed inside the wastewater from the grease trap. [Figure 2] FIG. 2 is a cross-sectional view of the grease trap drainage treatment device of the present invention, showing the state in which the pumping pump is suspended. [Figure 3]FIG. 2 is a cross-sectional explanatory view of the grease trap drainage treatment device of the present invention, in which the pumping pump is installed on a support base. [Figure 4] FIG. 10 is a cross-sectional explanatory view of another example of the grease trap drainage treatment device of the present invention, in which the pumping pump is suspended. [Figure 5] FIG. 1 is a cross-sectional explanatory view of a grease trap wastewater treatment device of the present invention, in which a wastewater recovery device is arranged on the outer periphery of a pumping pump. [Figure 6] FIG. 1 is a cross-sectional view showing an example of an existing grease trap. DETAILED DESCRIPTION OF THE INVENTION

[0016] [General-purpose grease trap] Wastewater (usually containing garbage) B is discharged from a kitchen or other area into grease trap A (Figure 6), the garbage contained in wastewater B is collected in basket C, and wastewater B containing grease E accumulates in grease trap A. Normally, the water speed inside grease trap A is slowed down by several partitions D, and the grease E accumulates on top of the water F (usually containing sludge) due to its specific gravity, and the water F is gradually discharged into the sewer or septic tank K via trap G. The grease E that accumulates on top of the water F inside grease trap A is mainly a combination of glycerin and fatty acids.

[0017] [Grease trap in the present invention] The grease trap of the present invention is not limited to a general-purpose grease trap with two parallel partitions D, as shown in Figure 6, but may have other structures that can retain oil, such as a water tank without partitions. Also, it may be a shallow (low-profile) grease trap with a depth of about 15 cm, or a normal (deep) grease trap with a depth of about 30 to 40 cm.

[0018] (Embodiment of a method for treating grease trap drainage) An embodiment of the method for treating grease trap effluent of the present invention is described below. In this embodiment, saponifying agent H is added to effluent B in grease trap A, and effluent B and saponifying agent H are pumped up using pump 2. The pump 2 then stirs and mixes effluent B to form a mixed liquid (a liquid in the process of being saponified), which is then discharged into effluent B in grease trap A. The process of pumping, stirring, mixing, and discharging effluent B and saponifying agent H is then repeated (continuously performed for a desired period of time) to produce a soapy liquid. More specifically, this method involves chemically converting the fats and oils E and water F in grease trap A into fatty acids (separating them from glycerin) and liquefying them into soap. By converting fats and oils E into fatty acids, biodegradability is significantly enhanced compared to the fats and oils E themselves.

[0019] The soap solution in the present invention does not necessarily have to be fully soapified, but may also be in an emulsified state. The saponifying agent H may be supplied from the outside into the pumping pump 2 instead of being added to the waste liquid B, or may be sucked in from the outside by the pumping pump 2 when the pumping pump 2 is pumping the waste liquid B, and stirred and mixed with the waste liquid B inside the pumping pump 2. A general-purpose submersible pump may be used as the pumping pump 2.

[0020] The saponifying agent H in the present invention is a general-purpose saponifying agent that, when mixed with the fats and oils E, converts the fats and oils into fatty acids (separating them from glycerin) through a chemical reaction to produce a soap solution (liquid soap). It includes various processing agents such as emulsifiers, detergents, and surfactants. Specifically, for example, the applicant's product (product name "Clean Ecoflow") can be used. Examples of ingredients contained in Clean Ecoflow include sodium hydroxide, potassium hydroxide, coconut fatty acid diethanolamide, several inorganic substances, purified water, and others. In the present invention, surfactants, deodorizers, neutralizers, and mixtures of two or more of these can also be used in addition to the saponifying agent, as long as they are capable of modifying the effluent B and are environmentally friendly. Liquid, gel, powder, and other forms of saponifying agent H can be used. The amount of saponifying agent H added to the effluent B can be freely determined depending on the amount of effluent B in the grease trap A, the amount of excess fats and oils E, the composition of the effluent, etc. (the quality of the effluent), etc.

[0021] The operation timing and operation time of the pumping pump 2, and the timing and amount of saponifying agent H to be added can be set, adjusted, and controlled as desired depending on the quantity and quality of the wastewater B in the grease trap A, the type and quality of the saponifying agent H, etc. The operation timing of the pumping pump 2 is, for example, once a day or several times a day, when it automatically starts operating at a predetermined time, and the operation time is the duration of one continuous operation. The timing of the saponifying agent H to be added is, for example, once a day or several times a day, when it automatically starts operating at a predetermined time, and the amount to be added is the amount to be added at one time. These timings and number of times can also be set to other times and numbers. These controls can be performed by the control unit (control panel) 4 (Figure 4).

[0022] The mixing ratio of waste liquid B to saponifying agent H is preferably about 5:1 in terms of saponification efficiency and cost, but this ratio can be changed depending on the degree of contamination of waste liquid B. If the contamination is severe, the amount of saponifying agent H can be increased from the above ratio, and if the contamination is light, the amount of saponifying agent H can be decreased.

[0023] The mixed liquid stirred and mixed by the pumping pump 2 cannot be sufficiently made into soapy liquid by a single stirring and mixing, so it is discharged into waste liquid B in the grease trap A through a discharge hose 3 connected to the outlet of the pumping pump 2, and the waste liquid B in the grease trap A is pumped up by the pumping pump 2 and stirred and mixed repeatedly to ensure that it can be made into soapy liquid.

[0024] It is desirable that the waste liquid B pumped up by the pumping pump 2 be mainly composed of grease E, so that the grease E can be efficiently converted into soap solution. To achieve this, it is desirable to align the pumping portion (pumping port) 8 of the pumping pump 2 placed inside the grease trap A with the vicinity of the position (height) of the grease E, as shown in Figure 4.

[0025] (Embodiment of a grease trap drainage treatment device) An embodiment of a grease trap wastewater treatment device of the present invention is shown in Figure 1. This wastewater treatment device comprises a pump 2, a saponifying agent H contained in a saponifying agent container 1 (Figure 4), and a control unit 4 (Figure 4). The pump 2 is a commercially available general-purpose submersible pump, and has a pumping port 8 at its bottom.

[0026] In the present invention, it is desirable to place the pumping pump 2 in the drainage liquid B of the grease trap A as shown in Figure 1, and align the pumping port with the position of the grease E at the top of the drainage liquid B so that it can mainly pump up the grease E. In this case, a low-floor type grease trap A is suitable.

[0027] The pumping pump 2 can also be placed in the wastewater B using a support. The support can be a support base 5 (Figure 3) or a lifting device 9 (Figure 2). If the grease trap A is deep, the support base 5 can be installed in the wastewater B and the pumping pump 2 can be installed on top of it. The support base 5 can be fixed in height, or it can be made height adjustable so that the height of the pumping port of the pumping pump 2 can be adjusted according to the height of the wastewater B. The support base 5 can also be replaced with a fixed one of a different height to adjust the height. The pumping pump 2 can also be suspended in the wastewater B using a lifting device 9 so that the height can be adjusted with a lift.

[0028] If there is space (air) outside or below the pumping port of the pumping pump 2, it may become difficult or impossible to pump up the waste liquid B. As a result, the waste liquid B near the bottom of the grease trap A may remain without being pumped up. In the present invention, a waste liquid recovery device 6 may be placed around the pumping port of the pumping pump 2 to prevent the formation of space (air) outside or below the pumping port of the pumping pump 2, making it possible to pump up the waste liquid B without difficulty and preventing any waste liquid from remaining unpumped.

[0029] The waste liquid collecting device 6 in Figure 5 is cylindrical, with an upper opening 10 serving as an inlet 11 for waste liquid B. The inlet 11 can be formed by providing a hole or groove in the upper part of the peripheral wall of the cylinder, so that the oil and grease components E in the upper part of the waste liquid B flow in through the inlet 11. The inlet 11 can also be formed by providing a hole or groove in the lower part of the peripheral wall of the cylinder, so that the waste liquid B in the lower part of the waste liquid B flows in through the inlet 11. If the inlet 11 is provided in the lower part of the peripheral wall of the cylinder, the remaining waste liquid B in the grease trap A will enter the waste liquid collecting device 6, making it less likely that a space will be created around the pumping port of the pumping pump 2, and almost all of the waste liquid B in the grease trap A will be pumped up by the pumping pump 2.

[0030] If it is difficult to sufficiently turn the liquid into soapy solution by a single stirring and mixing using the pumping pump 2, the waste liquid B stirred and mixed by the pumping pump 2 can be discharged into the waste liquid B in the grease trap A and mixed with the waste liquid B, and then the waste liquid B can be pumped up by the pumping pump 2 and stirred and mixed repeatedly, thereby making it easier to turn the liquid into soapy solution.

[0031] Waste liquid B often contains dust, food residue, etc. If this dust, residue, etc. is pumped into pumping pump 2, it can cause the pumping pump 2 to malfunction, so it is desirable to remove large dust, residue, etc. before pumping begins. Dust and residue that cannot be completely removed and is pumped into pumping pump 2 together with waste liquid B will be mixed into the mixed liquid discharged from pumping pump 2, so it is desirable to remove (recover) the dust and residue by discharging the mixed liquid discharged from discharge hose 3 connected to the discharge port of pumping pump 2 into a recovery device (net basket) 7 (Figure 4), etc. If there is little dust or it is fine, it is possible to discharge the dust without collecting the dust.

[0032] It is desirable to discharge the soapy solution outside the grease trap A through a filter (not shown). The filter has a filtering function to remove foreign matter from the soapy solution. It is also desirable for the filter to have various other functions such as decolorization, deodorization, deoiling, and chlorine removal. Two or more stages of filters can be installed in the discharge path of the soapy solution.

[0033] In the present invention, a control unit 4 (FIG. 4) is provided to set, adjust, and control the operation timing and operation time of the pumping pump 2, the timing and amount of saponifying agent H to be added, and the like. The operation timing of the pumping pump 2 is, for example, once a day or several times a day, when it automatically starts operating at a predetermined time, and the operation time is the duration of one continuous operation. The timing of adding saponifying agent H is, for example, once a day or several times a day, when it automatically starts to be added at a predetermined time, and the amount to be added is the amount to be added in one operation. These timings can be set at a fixed time every few days, or when a sensor detects that the amount of effluent B from grease trap A has reached a predetermined amount. The control unit 4 can also set, adjust, and control other desired operating conditions.

[0034] A saponifying agent container 1 (FIG. 4) disposed outside the grease trap A is connected to the pumping pump 2 midway, so that when the pumping pump 2 pumps up the wastewater B, the saponifying agent H is sucked into the pumping pump 2. An on-off valve (not shown) is provided between the saponifying agent container 1 and the pumping pump 2, and the on-off valve is controlled to open and close by a control unit 4 (FIG. 4), thereby adjusting the flow rate of the saponifying agent H or controlling the supply stop, supply start, operation timing, operation duration, etc. The control unit 4 can also control the start, stop, operation timing, operation duration, etc. of the pumping pump.

[0035] In the figure, 12 is a power cord and 13 is a handle for carrying the pump. [Industrial Applicability]

[0036] The above-described embodiment is a main example for solving the problem of the present invention. The design of the present invention can be modified as long as the problem can be solved. In addition, other devices can be added or changed to other devices. [Explanation of symbols]

[0037] 1 saponifier container 2. Pump 3 Discharge hose 4 Control unit (control panel) 5 Support stand 6. Drainage collection device 7. Recovery equipment (net basket) 8. Pumping part (pumping port) 9 Lifting equipment 10 Top opening 11 Inlet 12 Power cord 13 Handle A Grease trap B. Drainage C Basket D Divider E Oil content F Moisture G-Trap H Saponifying agent K Sewerage and septic tank

Claims

1. A method for treating effluent in a low-floor grease trap that stores effluent containing oil and fat, by liquefying the effluent into a soapy liquid, A saponifying agent is placed in the drainage liquid in a low-profile grease trap, and a submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid in the grease trap with the pumping port at the bottom side of the grease trap. The submersible pump in the drainage is operated continuously for a predetermined period of time, and while it is operating, the drainage in the grease trap and the saponifying agent added to the drainage are pumped into the submersible pump from the pumping port of the submersible pump, mixed and stirred to form a mixed liquid, and the mixed liquid is discharged from a discharge hose connected to the discharge port of the submersible pump into the drainage in the grease trap from above the top of the drainage, and the process of pumping up the drainage in the grease trap, mixing and stirring the pumped up drainage with the saponifying agent to form a mixed liquid, and discharging the mixed liquid from the discharge hose is repeated to turn the drainage in the grease trap into a soapy liquid. A method for treating grease trap effluent, comprising:

2. A method for treating effluent in a low-floor grease trap that stores effluent containing oil and fat, by liquefying the effluent into a soapy liquid, A submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid of a low-profile grease trap with the pumping port at the bottom side of the grease trap. The submersible pump in the drainage is operated continuously for a predetermined period of time, and while it is operating, the drainage in the grease trap is pumped into the submersible pump from the pumping port of the submersible pump, a saponifying agent is supplied into the submersible pump from a saponifying agent container outside the grease trap, the drainage and the saponifying agent are mixed and stirred inside the submersible pump to form a mixed liquid, and the mixed liquid is discharged from a discharge hose connected to the outlet of the submersible pump into the drainage in the grease trap from above the top of the drainage, and the process of pumping up the drainage in the grease trap, supplying the saponifying agent from the saponifying agent container into the submersible pump, mixing and stirring the pumped up drainage and the saponifying agent to form a mixed liquid, and discharging the mixed liquid from the discharge hose is repeated to turn the drainage in the grease trap into a soapy liquid. A method for treating grease trap effluent, comprising:

3. A method for treating effluent in a low-floor grease trap that stores effluent containing oil and fat, by liquefying the effluent into a soapy liquid, A submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid of a low-profile grease trap with the pumping port at the bottom side of the grease trap. The submersible pump in the drainage is operated continuously for a predetermined period of time, and while it is operating, the drainage in the grease trap is pumped into the submersible pump from the pumping port of the submersible pump, the submersible pump sucks saponifying agent from a saponifying agent container outside the grease trap into the submersible pump, the pumped drainage and the sucked saponifying agent are mixed and stirred in the submersible pump to form a mixed liquid, and the mixed liquid is discharged from a discharge hose connected to the outlet of the submersible pump into the drainage in the grease trap from above the top of the drainage, and the process of pumping the drainage in the grease trap, sucking the saponifying agent into the submersible pump, mixing and stirring the drainage and saponifying agent in the submersible pump to form a mixed liquid, and discharging the mixed liquid from the discharge hose is repeated to turn the drainage in the grease trap into a soapy liquid. A method for treating grease trap effluent, comprising:

4. The method for treating grease trap drainage according to any one of claims 1 to 3, By placing the submersible pump in the drainage liquid of the grease trap with its pumping port facing the floor of the low-profile grease trap, the pumping port is set at a height near the oil content of the drainage liquid in the grease trap, and the oil content of the drainage liquid is mainly pumped up into the submersible pump from the pumping port. A method for treating grease trap effluent, comprising:

5. The method for treating grease trap drainage according to any one of claims 1 to 3, A submersible pump equipped with a handle for carrying the submersible pump is placed in the drainage liquid in the grease trap so that the handle protrudes above the upper surface of the drainage liquid in the low-profile grease trap. A method for treating grease trap effluent, comprising:

6. The method for treating grease trap drainage according to any one of claims 1 to 3, At least one of the operating conditions such as the operation timing of the submersible pump, the operation duration, the supply timing of the saponifying agent, and the supply time is controlled by the control unit. A method for treating grease trap effluent, comprising:

7. A wastewater treatment device capable of liquefying wastewater from a low-floor grease trap that stores wastewater containing oil and fat, A submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid in the grease trap with the pumping port on the bottom side of the grease trap, The submersible pump operates continuously in the wastewater for a predetermined period of time, and during this operation, it pumps the wastewater in the grease trap and the saponifying agent contained in the wastewater into the submersible pump from the pumping port, stirs and mixes the pumped wastewater and the saponifying agent to form a mixed liquid, and discharges this mixed liquid from a discharge hose connected to the discharge port into the wastewater in the grease trap from above the top of the wastewater.By repeatedly pumping the wastewater in the grease trap, stirring and mixing the wastewater with the saponifying agent, and discharging the mixed liquid from the discharge hose, the wastewater in the grease trap can be turned into soapy liquid. A grease trap wastewater treatment device characterized by the above.

8. A wastewater treatment device capable of liquefying wastewater from a low-floor grease trap that stores wastewater containing oil and fat, A submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid in the grease trap with the pumping port at the bottom side of the low-profile grease trap, and a saponifying agent container for containing the saponifying agent is placed outside the grease trap. The submersible pump operates continuously in the drainage liquid for a predetermined period of time, and during this operation, the drainage liquid in the grease trap is pumped into the submersible pump from the pumping port of the submersible pump, and the drainage liquid is stirred and mixed with the saponifying agent supplied from a saponifying agent container outside the grease trap into the submersible pump to form a mixed liquid, which can then be discharged from a discharge hose connected to the discharge port into the drainage liquid in the grease trap from above the top of the drainage liquid.By repeatedly pumping the drainage liquid in the grease trap, stirring and mixing the drainage liquid with the saponifying agent supplied from the saponifying agent container, and discharging the mixed liquid from the discharge hose, the drainage liquid in the grease trap can be turned into soapy liquid. A grease trap wastewater treatment device characterized by the above.

9. A wastewater treatment device capable of liquefying wastewater from a low-floor grease trap that stores wastewater containing oil and fat, A submersible pump with a pumping port at the bottom and a discharge port at the top is placed in the drainage liquid in the grease trap with the pumping port at the bottom side of the low-profile grease trap, and a saponifying agent container for containing the saponifying agent is placed outside the grease trap. The submersible pump operates continuously in the drainage liquid for a predetermined period of time, and during this operation, it pumps up the drainage liquid in the grease trap through the pumping port, sucks up the saponifying agent in the saponifying agent container outside the grease trap, agitates and mixes the drainage liquid and the saponifying agent to form a mixed liquid, and discharges this mixed liquid from a discharge hose connected to the discharge port into the drainage liquid in the grease trap from above the top of the drainage liquid.By repeatedly pumping up the drainage liquid in the grease trap, agitating and mixing the drainage liquid with the saponifying agent sucked from the saponifying agent container, and discharging the mixed liquid from the discharge hose, the drainage liquid in the grease trap can be turned into soapy liquid. A grease trap wastewater treatment device characterized by the above.

10. The grease trap wastewater treatment device according to any one of claims 7 to 9, The pumping port of the submersible pump placed in the drainage liquid in the low-floor grease trap is set at a height near the height of the oil and grease content of the drainage liquid in the grease trap, so that the oil and grease content of the drainage liquid can be mainly pumped into the submersible pump from the pumping port. A grease trap wastewater treatment device characterized by the above.

11. The grease trap wastewater treatment device according to any one of claims 7 to 9, A submersible pump equipped with a handle is disposed in the drainage liquid in the grease trap so that the handle protrudes above the upper surface of the drainage liquid in the low-floor grease trap. A grease trap wastewater treatment device characterized by the above.

12. The grease trap wastewater treatment device according to any one of claims 7 to 9, A drainage recovery tool capable of introducing drainage liquid from the low-bed type grease trap is disposed on the bottom of the low-bed type grease trap, and a submersible pump is disposed in the drainage recovery tool with its pumping port on the bottom side of the low-bed type grease trap. A grease trap wastewater treatment device characterized by the above.

13. The grease trap wastewater treatment device according to any one of claims 7 to 9, A control unit capable of controlling at least one of operating conditions such as the operation timing of the submersible pump, the operation duration, the supply timing of the saponifying agent, and the supply time, A grease trap wastewater treatment device characterized by the above.

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