JP3754928B2 - Purification system for grease trap and method for operating the system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a purification system for the grease trap capable of decomposing oil in the grease trap used in a restaurant kitchen or the like by the action of an enzyme, and an operation method thereof.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2000-325938 discloses an invention relating to “a method and apparatus for treating contaminants including animal and vegetable waste oils”. In the present invention, liquid microorganism preparations are used to cause microorganisms to produce enzymes such as lipases, proteases, and amylases. These enzymes are converted into an aqueous solution and guided to a grease trap provided in a kitchen or the like, where oil, proteins, carbohydrates and the like in the wastewater are decomposed, and these can be treated together with the wastewater.
[0003]
[Problems to be solved by the invention]
In commercial kitchens such as restaurants, automatic dishwashers are often used. In this washing machine, high-temperature water of 70 to 80 ° C. is used together with the detergent, and then becomes waste water containing oil and flows into the grease trap. However, in the grease trap into which high temperature wastewater flows, the enzyme is deactivated because the temperature is high even if an aqueous enzyme solution is injected into the grease trap. In addition, grease traps generally do not have a means of mixing wastewater and aqueous enzyme solution, and are not allowed to be aerated in the grease trap when the kitchen is active. Even without it, it is difficult to mix well with oil and the like. For these reasons, it may be difficult for the grease trap purification method of degrading oil or the like using an aqueous enzyme solution as in the above-mentioned known technique to make full use of the degradation ability of the enzyme. In other words, the grease trap may not be sufficiently purified despite the use of an aqueous enzyme solution having a high decomposition ability.
[0004]
An object of the present invention is to provide a system and an operation method thereof that make it possible to sufficiently extract the decomposition ability of an aqueous enzyme solution when the grease trap is purified using the aqueous enzyme solution.
[0005]
[Means for Solving the Problems]
The present invention for solving the above problems comprises a first invention relating to a grease trap purification system, and a second invention and a third invention relating to a method of operating the system. Is as follows. First, the first invention is directed to a generation source of waste water containing oil, a grease trap with aeration means located downstream of the generation source, and interposed between the generation source and the grease strap. And a purification system for grease trap, which includes an aqueous solution storage tank connected to the piping.
[0006]
In such a purification system, the present invention is characterized as follows. The waste water exceeds 70 ° C., and the pipe and the grease strap are removed from the storage tank after a lapse of a delay time waiting for a temperature drop of the waste water flowing into the grease trap from the operation end time of the generation source. a first timer means capable of starting a pump for injecting the enzyme solution to one of the, possible to start the aeration pump in the aeration unit after predetermined time has elapsed from the injection of the aqueous enzyme solution and a second timer means.
[0007]
In a preferred embodiment of the first invention, the purification system includes means for notifying that the generation source is operable when a required time has elapsed after the operation of the aeration means is completed.
[0008]
In the second invention, in the purification system, by the first timer means starts the injection of the aqueous enzyme solution from delaying for at least 30 minutes after the end of operation of the source.
[0009]
In the third aspect of the invention, the operation of the generation source is started after at least 30 minutes have elapsed after the operation of the aeration means is completed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The details of the grease trap cleaning system and the operation method of the system according to the present invention will be described below with reference to the accompanying drawings.
[0011]
1 and 2 are views showing an enzyme aqueous solution preparation step in this purification system, and a step subsequent to that step, showing a grease trap purification step including an automatic dishwasher and grease trap. The preparation process of FIG. 1 includes a preparation tank 2 and an enzyme production tank 3 housed in a housing 1, and the preparation tank 2 and the production tank 3 are connected via a first pump P1. The production tank 3 is provided with a water supply pipe 4 having a second pump P2, an air diffuser pipe 6 having a third pump P3, and a heater 7. A liquid supply pipe 8 having a fourth pump P4 is shown from the bottom. It extends toward the two storage tanks 21.
[0012]
The preparation tank 2 contains a liquid microbial preparation 12 containing at least a microorganism capable of producing lipase among enzymes that decompose fat, protein, carbohydrates, etc., for example, Envirozyme 314GT manufactured by Winston, USA. It is thrown in. Incidentally, this liquid microbial preparation has the ability to produce multiple types of enzymes such as protease, amylase, and cellulase in addition to lipase. In the production tank 3, the microorganism preparation 12 is diluted with tap water supplied from the water supply pipe 4. The diluted microbial preparation 12 is heated by the heater 7 as necessary, and is aerated by the air diffusing tube 6 and cultured to such an extent that the microorganisms contained in the preparation 12 can produce their own enzymes. In the production tank 3, an aqueous enzyme solution in which lipase and the like are dissolved is obtained. Aeration is performed when the microorganism is aerobic and / or facultative anaerobic, and aeration is stopped when the microorganism is obligately anaerobic. However, since the liquid microbial preparation 12 is generally supplied as a mixture of a plurality of types of microorganisms, it is preferable to perform aeration intermittently in an appropriate cycle. The preparation process is a process that can be operated manually or automatically, but in the figure, illustration of various devices for automatic operation is omitted.
[0013]
The purification process shown in FIG. 2 is a case where the purification system according to the present invention is applied to an automatic dishwasher that is a source of waste water containing oil. The illustrated purification process includes an enzyme aqueous solution storage tank 21 connected to the liquid feeding pipe 8, an automatic dishwasher 22 such as a dishwasher, and a grease strap 23. The cleaning machine 22 and the grease strap 23 are connected via a first pipe 24. The storage tank 21 is connected to the first pipe 24 via the second pipe 26 having the fifth pump P5, and is connected to the grease strap 23 via the third pipe 27 having the sixth pump P6. The third pipe 27 is divided into a first branch pipe 28 and a second branch pipe 29, and each branch pipe 28, 29 extends to the inside of the top of the grease strap 23. In the grease strap 23, the waste water from the washing machine 22 flows into the left side of the figure, and the waste water flows out from the fourth pipe 34 on the right side of the figure. The inside of the grease strap 23 is partitioned into a plurality of sections as shown in the figure by first, second and third separators 31, 32, 33, and a diffuser pipe 36 from an air supply pump P7 as an aeration means extends at the bottom. . A spray nozzle 37 is provided at the top of the grease trap 23, that is, the ceiling portion, and the aqueous enzyme solution can be sprayed from the nozzle 37 toward the water surface w in the grease strap 23. The nozzle 37 is preferably above the first separator 31 and the third separator 33, and the aqueous solution of the enzyme can be sprayed on the sections formed on both sides of the separator by a single spray nozzle 37.
[0014]
In such a purification process, by injecting the aqueous enzyme solution into the first pipe 24 from the washing machine 22, an object to be decomposed such as oil remaining in the first pipe 24 and the grease strap 23 through which the aqueous enzyme solution flows. It can have an enzymatic degradation effect on the product. Such an aqueous enzyme solution is preferably injected into the upstream side of the first pipe 24 in order to allow purification of the entire first pipe 24. In addition, when the enzyme aqueous solution is sprayed in the grease trap 23, not only can the enzyme decompose directly on the oil component floating on the water surface w, but also on the downstream side of the grease strap 23. A sufficient amount of the aqueous enzyme solution can be supplied. The enzyme aqueous solution can be injected into the first pipe 24 and the grease trap 23 at the same time, or can be injected into only one of them.
[0015]
In the purification process, the fifth pump P5 and / or the sixth pump P6 for supplying the enzyme aqueous solution is started after the required time has elapsed after the operation of the cleaning machine 22, for example, after the operation scheduled for one day is completed. To be controlled. In the illustrated example, the fifth pump P5 and / or the sixth pump P6 is started between the washing machine 22 and these pumps P5 and P6 so that it starts after preferably 30 minutes or more after the operation of the washing machine 22 ends. It is controlled by the first timer means T1 intervening. The seventh pump P7 for aeration is a second timer means interposed between the pumps P5, P6 and the seventh pump P7 so as to operate after the start of the fifth pump P5 and / or the sixth pump P6. It can be controlled by T2. Furthermore, the washing machine 22 is preferably used after the required time has elapsed after the end of the operation of the seventh pump P7, preferably 30 minutes or more, more preferably 1 hour or more. Between the pump P7 and the washing machine 22, the 3rd timer means T3 which can notify the progress of the time is interposing. Although not shown, each of the fifth to seventh pumps P5 to P7 is provided with timer means for regulating the operation time.
[0016]
In the purification system thus formed, the grease trap 23 is started by starting the fifth pump P5 and / or the sixth pump P6 with a delay of a required time, preferably at least 30 minutes after the operation of the washing machine 22 is completed. You can wait for the temperature drop in the wastewater. The hot water at around 80 ° C. that is frequently used in the cleaning machine 22 deactivates the enzyme, so that it is not preferable to inject the enzyme aqueous solution during or immediately after the operation of the cleaning machine 22. However, it is not preferable to increase the delay time of the enzyme aqueous solution injection. This is because the oil component starts to separate from the water and rise as time passes, so that the chance of contact between the enzyme dissolved in the water and the oil component decreases. In this purification step, it is preferable to operate with a delay time of 30 to 90 minutes. The start of the seventh pump P7 for aeration may be simultaneous with the start of the fifth and sixth pumps P5 and P6, but it is delayed for 15 to 30 minutes and started when the enzyme aqueous solution reaches the grease trap. preferable. The cleaning machine 22 restarts operation after the required time has elapsed after the end of aeration, preferably after 30 minutes or more, and more preferably after 60 minutes or more. When the restart of the operation of the washing machine 22 is delayed in this way, the undecomposed oil component that has been dispersed in the water by the grease trap 23 rises during the delay time, so that the waste water from the washing machine 22 after the operation resumes. Oil is not allowed to flow out of the fourth pipe 34.
[0017]
【The invention's effect】
According to the grease trap purification system of the present invention, the enzyme aqueous solution is injected into the piping and grease trap after a necessary time delay after the operation of the washing machine, so that the enzyme is deactivated by the high temperature waste water flowing from the washing machine. There is no fear of that. In addition, since the operation of the washing machine is resumed with a delay of the required time after the aeration is completed, oil can be lifted from the wastewater in the grease trap during the delay time to prevent the oil from flowing out of the grease trap. it can.
[Brief description of the drawings]
FIG. 1 is a diagram showing a preparation process of a grease trap purification system.
FIG. 2 is a diagram showing a purification process of a grease trap purification system.
[Explanation of symbols]
2 Liquid microbial preparation tank 3 Enzyme production tank 6 Aeration pipe 21 Enzyme aqueous solution storage tank 22 Source (washing machine)
23 Grease strap 24 Piping 36 Aeration means T1 timer means T2 timer means T3 timer means

Claims (4)

A generation source of waste water containing oil, a grease trap with aeration means located downstream of the generation source, a pipe interposed between the generation source and the grease strap, and an enzyme aqueous solution storage tank connected to the pipe A grease trap purification system comprising:
The waste water exceeds 70 ° C., and the pipe and the grease strap are removed from the storage tank after a lapse of a delay time waiting for a temperature drop of the waste water flowing into the grease trap from the operation end time of the generation source. a first timer means capable of starting a pump for injecting the enzyme solution to one of the, possible to start the aeration pump in the aeration unit after predetermined time has elapsed from the injection of the aqueous enzyme solution the purification system is characterized in that a second timer means.   The purification system according to claim 1, further comprising means for notifying that the generation source is operable when a required time elapses after the operation of the aeration means is completed. Wherein the first timer means, according to claim 1 or 2 The method of operating purifying system according to initiate the injection of the aqueous enzyme solution from delaying for at least 30 minutes after the end of operation of the source.   The operation method of the purification system according to claim 1 or 2, wherein the operation of the generation source is started after at least 30 minutes have elapsed after the operation of the aeration means.

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