JP3921377B2 - Circulating type oil / water separation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention treats waste liquid containing a large amount of fat and solid food residue drained from sinks used in food factories and restaurant kitchens with a grease interceptor of a terminal treatment apparatus, and a part of the treated waste liquid is skimmered. The pumped water is pumped into the oil / water separation oil / fat recovery device to perform oil / water separation and oil / fat recovery, and the oil and fat-removed warm waste water drained from the oil / water separation / fat recovery device is recirculated and poured into the grease interceptor. The fluidity of the oil and fat collected and reduced in the grease interceptor is restored, the solid food residue is removed again, and a part of the heated waste liquid is pumped up as a mixed liquid by a skimmer pump, and the oil-water separated oil and fat recovery The present invention relates to a circulating oil / water separation / fat recovery method in which the oil / water separation / recovery is performed with high efficiency from the reflux mixture.
[0002]
[Prior art]
Conventionally, waste liquids containing a large amount of oil and solid food residue drained from sinks used in food factories and restaurant kitchens are treated with a grease interceptor, which is a terminal treatment device, and drained into public sewers. The majority. However, due to the increase in the amount of waste liquid treatment, the influence from the environment at the installation site and the change over time, the oil and water separation tank in the grease interceptor accumulates the oil that floats and floats up, and pumps up the installed skimmer pump. -In oil pumping means, low fluidized fats and oils are not easily pumped into a fat and oil recovery tank and the function of the grease interceptor is reduced.
[0003]
In each case, it is necessary to manually remove and collect the oil and fat whose fluidity has decreased, and the oil and fat must be changed over time to be treated as industrial waste. It becomes a factor that costs increase.
[0004]
In the grease interceptor, since the inflowing waste liquid flows up and down in the built-in oil / water separation tank, the oil / water of the oil and fat separated and floated on the relationship that the partition wall is set up so as to protrude from the liquid surface of the oil / water separation tank. There is a problem that the flow of the separation tank liquid surface is hindered by the partition walls.
[0005]
[Problems to solve the problem]
However, because the existing grease interceptor is installed outdoors or at a distance from the sink of the food factory, restaurant kitchen, etc., the waste liquid containing the inflowing oil and solid food residue is separated into the oil interceptor of the grease interceptor. The oil and fat of the waste liquid is cooled in the tank, and its fluidity is reduced. Ultimately, it stays in the oil / water separation tank. The oil and fat staying in the oil / water separation tank lowers the waste liquid treatment function of the grease interceptor, and there is a possibility that the waste liquid that is insufficiently treated or untreated overflows from the grease interceptor and pollutes the environment.
[0006]
In order to restore the fluidity of the oil and fat that has fallen due to a decrease in fluidity and to heat the waste liquid for the purpose of smooth operation of the installed skimmer pump, after the oil fluidity has been recovered and the oil has been recovered and removed The treated hot waste liquid does not recover the heat that is stored, and is drained to the public sewer outside the processing apparatus.
[0007]
In addition, the existing grease interceptor has a structure in which the waste liquid inlet protrudes from the wall surface of the oil / water separation tank in the grease interceptor onto the liquid surface of the oil / water separation tank, and the tip thereof is curved toward the liquid surface or in the liquid level. It is installed in a parallel straight cylinder. The strainer provided under the waste liquid inflow port is installed in an area partitioned by a partition wall standing for the purpose of extending the waste liquid flow path, protruding from the liquid level of the oil / water separation tank in the grease interceptor.
[0008]
Since the height of the strainer is set to be equal to or lower than the waste liquid inlet, solid food residue and fat and oil contained in the waste liquid that has flowed in are mixed at the liquid level in the strainer to become a viscous material and the liquid level in the oil / water separation tank Swelling up, worst-case strainer is clogged, waste liquid overflows from grease interceptor, solid food residue gets over the partition, overflows into the oil-water separation tank and is sucked into the skimmer pump and clogs it, or The waste liquid flowed back through the pipe and overflowed from the sink.
[0009]
[Means for solving the problems]
In order to solve the above-mentioned problems, a circulating oil-water separation oil and fat recovery method according to the present invention includes a sink used in food factories and restaurant kitchens, and a waste liquid containing a large amount of oil and fat to be drained and solid food residue. A grease interceptor that includes a skimmer pump, which is a processing device, and has a partition wall-structured oil / water separation tank that does not hinder the flow of floating oil and fat, and the oil / water separation oil / fat recovery function that the present inventor presents in JP-A-2000-84542 It consists of devices.
[0010]
The primary waste liquid stored after removal of solid food residue is pumped up from the inflow waste liquid with a skimmer pump from the grease interceptor, poured into the oil / water separation oil / fat recovery device, and the warm waste water discharged after the oil / fat recovery processing by the device Then, water is again poured into the oil interceptor in the grease interceptor, and the heat storage of the warm waste water raises the temperature of the primary waste liquid stored in the oil / water separator and recovers the fluidity of the oil and fat that has floated and reduced its fluidity. The recovered oil and fat and a part of the heated primary waste liquid are pumped up as a mixed solution by the skimmer pump, recirculated to the oil / water separation oil / fat recovery device, and separated into oil / water and recovered by the oil / water separation oil / fat recovery device. Waste water from which oils and fats have been sufficiently removed is drained outside the interceptor.
[0011]
Further, the strainer housed in the oil interceptor with a built-in grease interceptor has a height of the back plate of the strainer facing the front of the waste liquid inlet installed without protruding from the wall surface of the built-in oil / water separator. A shape that is set in a range higher than the upper edge and close to the lid of the grease interceptor, and has a function to prevent the solid food residue captured from the waste liquid from overflowing from the strainer to the oil / water separation tank in the grease interceptor. It was.
[0012]
The present invention comprising the oil / water separation oil collecting device and the grease interceptor causes solid food residue to overflow from the waste liquid flowing into the grease interceptor into the oil / water separation tank with a built-in grease interceptor, and the skimmer pump sucks and closes it. An object of the present invention is to provide means for effectively collecting the heat stored in the warm waste water drained from the oil / water separation oil / fat recovery device for oil / water separation and oil / fat recovery.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a conceptual diagram showing a circulating oil / water separation / fat recovery method of the present invention. FIG. 2 is an external view of an apparatus having an oil / water separation / fat recovery capability. 3 is a cross-sectional view taken along line AA of the external view shown in FIG. FIG. 4 is a front view of the grease interceptor used in the circulating oil / water separation oil collection method of the present invention. FIG. 5 is a view showing a state in which the solid food residue captured by the strainer built-in strainer is accumulated at the grease interceptor inlet. FIG. 6 is an external view of a strainer. FIG. 7 is a front view of a conventional grease interceptor.
[0015]
As a pre-preparation for oil recovery by the circulating oil-water separation oil recovery method of the present invention, the secondary waste liquid stored in the oil-water separation tank 23 of the oil-water separation oil recovery apparatus 3 is preheated by the heater 25 before the waste liquid is introduced. Then, the temperature is raised to a predetermined temperature described later.
[0016]
After the temperature of the stored secondary waste liquid in the oil / water separation tank 23 rises to a predetermined temperature, the stored primary waste liquid is pumped up from the oil / water separation tank 13 of the grease interceptor 2 by the skimmer pump 4 provided in the grease interceptor 2 to separate the oil / water. Water is poured into the oil and fat recovery device 3 to recover the oil and fat. Thereafter, the warm waste water after the oil and fat is recovered from the secondary waste liquid drained from the oil and water oil and fat recovery device 3 is poured into the oil and water separation tank 2 of the grease interceptor, and the stored primary waste liquid in the oil and water separation tank 2 is predetermined. Until the temperature is raised, the pumping of the primary waste liquid and the pouring of the warm waste water are repeated, and the preparation is completed.
[0017]
1 and 4, the waste liquid containing a large amount of oil and solid food residue F drained from the sink 1 flows into the grease interceptor 2 via the pipe 5 as shown by the arrow (1).
[0018]
The built-in oil / water separation tank 13 of the grease interceptor 2 has a partition wall 14, 15 partitioning the interior of the grease interceptor 2 that floats on the liquid surface of the oil / water separation tank 13 and does not hinder the flow of the oil and fat layer. From the liquid surface direction, it is erected without protruding from the liquid surface.
[0019]
Immediately below the waste liquid inlet 9 provided without protruding from the wall surface of the oil / water separation tank 13 having the partition wall, a strainer 10 of a housing having an upper surface opened and formed of a punch plate is shown in FIG. The opposite surface of the back plate 11 is provided in close contact with the tank wall on the waste liquid inlet 9 side of the oil / water separation tank 13. The back plate 11 of the strainer 10 faces the front surface of the waste liquid inlet 9, and the height is within the range from the upper edge of the inlet 9 to the vicinity of the grease interceptor lid 12, and the lid is closed. The width of the back plate 11 is set slightly smaller than the width of the oil / water separation tank 13. The punch hole diameter is such that the solid food residue F having a size that clogs the skimmer pump 4 is reliably captured.
[0020]
Furthermore, even when the grease interceptor 2 is in operation, even when the stored primary waste liquid buried portion of the strainer 10 is filled with the solid food residue F, the back plate 11 is provided with the liquid level of the strainer 10 as shown in FIG. The solid food residue F having a size that clogs the skimmer pump 4 from the protruding portion has a function of preventing the oil / water separation tank 13 from overflowing.
[0021]
Even when the stored primary waste liquid buried portion of the strainer 10 is filled with the solid food residue F, since the housing of the strainer 10 is formed of a punch plate, the solid food residue F is captured. The flow of the primary waste liquid flows out from the stored primary waste liquid buried portion of the strainer 10 to the oil / water separation tank 13 and is not hindered.
[0022]
In FIG. 4, the waste liquid flows into the strainer 10 as shown by the flow of the arrow (1), and the solid food residue F is captured and separated from the waste liquid. The strainer 10 is not provided in an area partitioned by a partition wall that protrudes from the liquid level of the oil / water separation tank 13, and the partition wall stands upright from the bottom of the tank adjacent to the back plate 11 side of the strainer 10. Since the waste liquid flowing into the strainer 10 is separated from the solid food residue F, most of the oil and fat contained therein is separated from the solid food residue F due to the flow of the waste liquid, and the strainer together with the primary waste liquid. Passing through 10, the flow is not hindered and flotation, assembly, and coalescence are promoted, and floating oil and fat 19 is formed in the entire liquid surface of the oil / water separation tank 13. In the figure, the arrow without a symbol indicates the flow of the primary waste liquid and fats and oils.
[0023]
In the internal structure of the conventional grease interceptor shown in FIG. 7, the oil / water separation tank 74 is partitioned by the partition wall 73 and provided with the strainer 72 due to the effect of the partition wall 73 standing and protruding from the liquid surface. A large amount of oil and fat that has floated in the area adheres to the trapped solid food residue in the strainer 72 and cannot flow to the compartment in the adjacent oil-water separation tank 74. It is also difficult to install the skimmer pump 83 in a narrow section where the strainer 72 is installed.
[0024]
The fluid oil and fat flowing into the adjacent area is such that fine oil and fat particles entrained in the flow of the inflowing waste liquid pass through the water flow port 81 and flow into the adjacent area and separate and float. From the amount of fat and oil contained in the inflowing waste liquid Then it is a small amount. Therefore, the operation | work which moves floating oil to an adjacent area from the inside in which the strainer 72 was installed manually is needed at any time.
[0025]
The grease interceptor 2 of the present invention was invented for the purpose of improving the low oil flow efficiency of the conventional grease interceptor.
[0026]
In FIG. 4, the purpose of the structure of the grease interceptor 2 in which the partition wall 15 is erected immediately before the trap 16 is to obtain the following effects. A part of the primary waste liquid after most of the contained fats and oils floats due to the difference in specific gravity flows from the liquid level toward the bottom of the oil / water separation tank 13 as indicated by an arrow (3), and near the bottom of the tank. It flows into the trap 16 from the trap inlet 17 that opens toward the trap 16 and is drained from the outlet 18. The flow direction of the primary waste liquid is opposite to the direction in which the fine fat and oil particles contained in the primary waste liquid rise to the liquid surface due to the difference in specific gravity, so that the primary waste liquid is flowing to the trap inlet 17. However, the fine fat and oil particles continue to float toward the liquid surface due to the difference in specific gravity, and the fine fat and oil particles are not allowed to flow out of the grease interceptor 2 although the amount is less than the allowable discharge amount stipulated by law. It can be greatly hindered.
[0027]
The primary waste liquid from which the solid food residue F has been removed from the waste liquid is pumped up by the skimmer pump 4 as a mixed liquid together with the floating oil and fat 19 that has been separated and floated, and is circulated to the oil and water separation oil and fat recovery device 3.
[0028]
The oil / water separation and recovery device 3 is shown in FIG. A washing tank 20 for receiving the primary waste liquid or mixed liquid in the oil / water separation / recovery device 3, an oil / water separation tank 23 having a heater 25 and an auxiliary separator 28, and a belt-type oil for pumping up the oil / fat separated from the oil / water The skimmer 27 is composed of elements such as a fat / oil tank 29 for storing the collected fat / oil.
[0029]
1 and 3, the mixed solution flows into a strainer (not shown) accommodated in the washing tank 20 of the oil / water separation oil / fat recovery device 3 via the pipe 7, and the secondary solids in which the fine solid food residue is captured. The waste liquid passes through the duct 21 as indicated by the arrow (4) and flows into the oil / water separation tank 23 from the duct outlet 22 as indicated by the arrows (5) and (6). Immediately after the inflow, the flow of the secondary waste liquid collides with the guide plate 24, and the turbulent state is adjusted to the rectification state shown by arrows (8) and (9). The oil / water separation tank 23 is heated to 50 to 60 ° C. by the heater 25, and the fat and oil contained in the secondary waste liquid floats on the liquid surface as indicated by the arrow (7) due to the difference in specific gravity with the auxiliary separator 28, An oil / fat layer is formed, pumped up by a belt-type oil skimmer 27, and collected in an oil / fat tank 29.
[0030]
The waste water flow from which most of the oil and fat is separated from the secondary waste liquid indicated by arrows (10), (11), and (12) flows into the auxiliary separator while swirling around the auxiliary separator 28, The waste water passes through the auxiliary separator 28 ascending and descending while further separating and removing the oil and fat, and is drained from the waste water outlet 30 of the oil and water separation oil and fat recovery device 3 as warm waste water.
[0031]
The drained warm wastewater is guided to the grease interceptor 2 via the pipe 8 and poured into the built-in oil / water separation tank 13. The temperature of the injected water waste water rises to the temperature of the primary waste liquid stored in the oil / water separation tank 13, and then reaches a temperature at which the fluidity of the low fluidized oil and fat floating on the liquid surface of the primary waste liquid is recovered. The primary waste liquid and the warm waste water circulate through the pipe connecting the grease interceptor 2 and the oil, water, and fat recovery device. Even during circulation, oil / water separation and oil / fat recovery continue.
[0032]
The oil and fat whose fluidity has been recovered is pumped together with a part of the primary waste liquid by the skimmer pump 4 and circulated to the oil and water separation oil and fat recovery device 3 via the pipe 7, and the above-described processing is repeated, so that the oil and fat are highly efficient. It is collected at.
[0033]
The reason for pumping up oil and fat whose fluidity has been recovered together with a part of the primary waste liquid whose temperature has been raised by the skimmer pump 4 is that the specific heat of the oil and fat is smaller than that of water, and that the cooling of the oil and fat is prevented from being reduced by cooling during the pipe flow. It is. The recovered fats and oils have sufficient purity to be effectively used as secondary resources for producing fertilizers, feeds and the like.
[0034]
The oil / water separation oil / fat recovery device 3 provided is adjacent to the existing sink 1 in consideration of the same height, depth, and width for obtaining the internal volume that can secure the oil / water separation efficiency and the heat storage amount of the stored waste liquid. It is preferable to attach, and it becomes possible to prevent the obstruction of the flow work due to uneven heights of the kitchen facilities, and the oil and fat recovery state can be visually recognized.
[0035]
【The invention's effect】
As described above, the primary waste liquid from which the grease interceptor 2 and the solid food residue are removed circulates from the sink 1 of the waste liquid generation source to the main flow path of the grease interceptor 2 according to the present invention which is a terminal treatment device. By disposing the oil / water separation oil / fat recovery device 3, the circulating oil / water separation oil / fat recovery method of the present invention possesses the following advantages.
[0036]
1) The oil and fat contained in the waste liquid that has flowed in, which causes the function of the grease interceptor 2 that is a final treatment device, to be lowered due to the influence of the environment, the liquid level of the oil / water separation tank 13 in the grease interceptor 2 is reduced. As a result, the temperature of the stored primary wastewater is raised by the warm wastewater drained from the oil / water separation oil / fat recovery unit 3 on the circulation flow path, and the fluidity of the oil / fat that floats and lowers the fluidity. Is recovered by pumping together with a part of the heated primary wastewater by the equipped skimmer pump 4 and circulating to the oil / water separation oil / fat recovery device 3 to recover the oil / fat, thereby preventing the grease interceptor 2 from being degraded and maintaining its function. Yes.
[0037]
2) Warm wastewater drained from the oil / water separator / oil collecting device 3 is guided to the grease interceptor 2, and the stored heat plays a role in maintaining the function of the grease interceptor 2, and is drained to the public sewer. The oil and fat whose fluidity has been recovered plays a role of circulating to the oil / water separation oil and fat recovery device 3 while maintaining fluidity, and is effectively used without wasting heating costs.
[0038]
3) Grease interceptor 2 Oil and water separation oil and fat recovery device 3 Oil and water separation tank 3 of oil and water separation oil and fat recovery device 3 is circulated through the oil and fat having a large particle size and partly heated primary waste liquid. The amount of oil and fat that floats to 23 increases, and oil / water separation and oil and fat recovery can be performed with high efficiency.
[0039]
4) Grease interceptor 2 built-in oil / water separation tank 13 has a partition structure that does not hinder the flow of the oil and fat separated and floated on the liquid surface of the oil / water separation tank. Because of this structure, the skimmer pump 4 installed at one place can efficiently pump the mixed liquid composed of the oil and fat and a part of the primary waste liquid whose temperature has been raised, and circulate water into the oil / water separation oil and fat recovery apparatus 3.
[0040]
5) The strainer 10 installed in the oil / water separation tank 13 has a height that is higher than the upper edge of the waste liquid inlet 9 and does not hinder the closure of the lid 12 within the range up to the vicinity of the lid 12 of the grease interceptor. As a result of possessing the given back plate 11, the solid food residue F can be prevented from overflowing from the strainer 10 and flowing into the oil / water separation tank 13.
[0041]
6) The oil / fat collected by the conventional grease interceptor 83 has been altered and spoiled while being left for a long period of time, and has been treated as industrial waste. Then, early recovery can be performed, and the recovered fats and oils can be used as secondary beneficial resources for producing fertilizers, feeds, etc. with high purity.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a method for recovering circulating oil / water separation oil according to an embodiment of the present invention.
[Fig. 2] Fig. 2 is an overall view of an apparatus having an oil / water separation oil collecting capability.
FIG. 3 is a cross-sectional view taken along line AA of the overall view shown in FIG. 2;
FIG. 4 is a front view of a grease interceptor used in the present invention.
FIG. 5 is a state diagram in which solid food residue captured by a strainer provided in the grease interceptor is accumulated higher than the grease interceptor inlet.
FIG. 6 is an external view of a strainer.
FIG. 7 is a front view of a conventional grease interceptor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sink 2 Grease interceptor 3 Oil-water separation oil-fat collection apparatus 4 Skimmer pump 5 Oil-water separation tank 6 Skimmer pump 7 Piping 8 Piping 9 Waste liquid inlet 10 Strainer 11 Back plate 12 Lid 13 Oil-water separation tank 14 Bulkhead 15 Bulkhead 16 Trap 17 Trap flow Inlet 18 Drain outlet 19 Floating oil / fat 20 Washing tank 21 Duct 22 Duct outlet 23 Oil / water separation tank 24 Guide plate 25 Heater 26 Heater control unit 27 Belt type oil skimmer 28 Auxiliary separator 29 Oil / fat tank 30 Waste water outlet F Solid food residue 71 Inlet 72 Strainer 73 Partition 73a Partition 74 Oil / water separation tank 75 Partition 76 Trap 77 Trap inlet 78 Drain port 79 Odor prevention lid 80 Floating oil / fat 81 Water inlet 82 Cover 83 Skimmer pump 84 Grease interceptor

Claims (2)

A grease interceptor used in a circulation type oil / water separation oil collecting method, wherein a waste liquid inlet provided in the grease interceptor is provided so as not to protrude from a wall surface of the oil / water separation tank with a built-in grease interceptor, and the grease The partition wall that partitions the oil / water separation tank in the interceptor is set up immediately before the trap and is lower than the positions of the waste liquid inlet and the drain outlet provided in the grease interceptor, from the bottom of the oil / water separation tank. A grease interceptor having a partition wall structure that stands upright without protruding from the liquid surface in the liquid surface direction and does not obstruct the flow of the waste liquid after passing through the strainer and the oil that separates and floats in the liquid surface area of the oil / water tank.   A circulating oil / water separation / fat recovery method using the grease interceptor according to claim 1, wherein the oil / fat drained from a sink used in a food factory, a restaurant kitchen, etc. and a waste liquid containing a large amount of food residue , A circulating oil / water separation oil / fat recovery method for circulating and treating the waste liquid, pumping the stored waste liquid from the grease interceptor, which is a terminal treatment apparatus, to the oil / water separation oil / fat recovery apparatus provided with the skimmer pump, After the waste liquid treatment from the waste liquid, the heated waste water from which the oil and fat has been removed is passed through the oil / water separation tank in the grease interceptor, so that the heat storage of the warm waste water is reduced to the oil / water separation tank in the grease interceptor. The fluidity of the floated oil / fat is recovered, and the liquid mixture of the oil / fat that has become free-flowing and a part of the waste liquid that has been heated is pumped up by a skimmer pump and circulated to the oil / water separation oil / fat recovery unit. Collect , Consists grease interceptor unit and oil-water separator oil recovery apparatus sewage treatment apparatus, recycling oil separating oil recovery method for effectively utilizing the temperature wastewater is drained from the oil water separator oil recovery system.

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