JP4157700B2 - Oil / water separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an apparatus for separating solid food residue from inflow waste liquid in an oil / water separation oil / fat recovery apparatus that separates and recovers solid food residue discharged from kitchens such as restaurants and ramen shops and waste liquid containing a large amount of fat and oil. The built-in washing tank and the oil / fat recovery tank provided are detachably accommodated in the upper part of the apparatus, an oil / water separation tank is formed in the lower part of the apparatus, and the oil / fat separated and floated in the oil / water separation tank It is equipped with a belt type oil skimmer. The present invention relates to an oil / water separation tank in which an oil / water separation tank is integrated as a lower structure, and an embedded washing tank, an oil / fat recovery apparatus, and an oil / fat recovery tank are integrated as an upper structure.
[0002]
[Prior art]
Food residues discharged from kitchens such as restaurants and ramen stores are composed of solid food residues and waste liquid containing a large amount of fats and oils. As an apparatus for separating and collecting oils and fats from this waste liquid, there is a technique presented by the present inventors. In this device, the built-in type washing tank is housed and integrated in the oil / water separation oil and fat recovery device, and no gap is formed between the built-in type washing tank and the oil / water separation tank in the vertical position, and the oil / water separation tank is occupied. There is a form in which the volume is utilized to the maximum extent.
[0003]
The primary waste liquid from which the rough solid food residue is captured and removed from the waste liquid by the strainer installed in the built-in type washing tank of the oil / water separation and recovery apparatus installed in the kitchen is separated from the washing tank through the duct. The oil flows into the tank, and the oil and fat is separated from the primary waste liquid due to the difference in specific gravity with the auxiliary separator installed in the oil / water separation tank, and floats on the liquid surface of the oil / water separation tank, and then installed in the oil / water separation tank Oil is pumped up and stored in a collection tank by the belt type oil skimmer.
[0004]
[Problems to be solved by the invention]
However, an auxiliary separator is provided in the built-in oil / water separation tank to promote the separation and floating of fats and oils due to the difference in specific gravity from the primary waste liquid, but one section of the oil / water separation tank adopts a housing structure when the primary waste liquid flows in excessively In such a case, the primary waste liquid may flow out of the oil / water separation oil / fat recovery apparatus in a state where the oil / fat is not sufficiently time to separate and float and the oil / fat separation / floating is insufficient. Even if it is spilled, the fat and oil is separated and recovered from the primary waste liquid by the grease interceptor of the end-of-life treatment equipment, so it does not deteriorate the public sewerage and the environment. It is necessary to secure and improve the ability to collect oil and fat, and drain waste water (waste liquid after collecting oil and fat) outside the apparatus.
[0005]
In addition, since a discharge port is provided at the bottom of the bottom of the funnel-shaped oil / water separation tank, the gap between the discharge port and the kitchen floor becomes narrow. As a result, a large-diameter valve is not attached to the discharge port, and when discharging a fine solid food residue (miso, spices, etc.) remaining in the oil-water separation tank, the discharge port valve is easily blocked by the residue. Occurs. In order to eliminate the blockage, the operator required an inefficient effort to remove the cleaning tank of the upper structure and remove and collect it manually and with running water.
[0006]
[Means for solving the problems]
In order to solve the above-mentioned problems, the oil / water separation oil / fat recovery apparatus according to the present invention is a means for sufficiently separating and floating the oil / fat from the primary waste liquid due to the specific gravity difference, for the purpose of extending the flow path within a limited volume. The oil / water separation tank built in the apparatus is divided into a first tank having a small upper opening area and a small capacity and a second tank having a large capacity. And the lower part of the vertical partition which divides the said 1st tank and the 2nd tank has a polyhedral structure which has a gradient toward the fine solid food residue discharge port provided in the oil-water separation tank bottom vicinity joint part of the 2nd tank standing wall A partition inclined surface is formed. A part of the contact portion between the inclined surface of the polyhedral structure partition wall and the bottom of the tank having a gradient toward the discharge port is provided with an opening through which the first tank and the second tank pass water, and the polyhedral structure partition wall slope of the lower partition wall is provided. The surface is responsible for the function of causing most of the oil and fat to concentrate and float on the liquid surface of the first tank from the primary liquid waste flowing from the first tank to the second tank in the first tank. The large-diameter valve can be attached by installing the tank bottom joint portion of the second tank lower vertical wall. Thereby, the discharge port was not blocked by the fine solid food residue settled on the bottom of the second tank during the cleaning and inspection of the apparatus, and means for having a function of quickly discharging the fine solid food residue was taken.
[0007]
Further, the oil / water separation oil / fat recovery apparatus according to the present invention has a built-in oil / water separation tank divided into a first tank and a second tank connected by a water inlet, and has a strainer for separating solid food residue from waste liquid on the upper surface of the second tank. And a built-in cleaning tank having a flow path through which the primary waste liquid is poured into the first tank, and a recovery tank for storing oil pumped up by the main belt type oil skimmer are detachably incorporated, and the first tank Is equipped with a main belt type oil skimmer that is always in operation and pumps up most of the oil that floats and separates due to the difference in specific gravity. The second tank is provided with a sub-belt type oil skimmer that is capable of arbitrarily adjusting the operation cycle for pumping up residual oil separated and floated due to the difference in specific gravity from the auxiliary separator and returning it to the first tank.
[0008]
The oil and fat pumped up by the sub-belt type oil skimmer provided in the second tank and circulated back to the first tank is capable of adjusting the operation cycle arbitrarily. The bulkiness is increased, whereby the oil and fat adsorption effect of the main belt type oil skimmer becomes high efficiency, and ultimately the oil and fat recovery efficiency from the waste liquid is improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 is an external view of an oil / water separation oil / fat recovery apparatus 1 of the present invention. FIG. 2 is an overhead view of the internal structure with the built-in top plate 2, the cleaning tank 3, and the upper components of the strainer 4 removed. 3 is a cross-sectional view taken along the line AA of FIG. 4 is a cross-sectional view taken along the line BB in FIG. FIG. 5 is a front view of the auxiliary separator.
[0011]
As a preparation before waste liquid treatment, all the primary waste liquid stored in the oil / water separation tank 8 is preheated to 50 to 60 ° C. by the heater 6.
[0012]
1, 3, and 4, the primary waste liquid passes through the upper structure strainer 4 and the cleaning tank 3, and as shown by an arrow (1), passes through the waste liquid receiving tray 11 and the waste liquid conduction port 23, and the oil / water separation tank. It flows into the first tank 9 in 8.
[0013]
In FIG. 2, the upper part of the first tank 9 is formed in a casing shape that is partitioned by a standing partition wall and opened to the upper part, and the lower part of the first tank 9 standing partition wall is a polyhedral structure partition sloped surface 14. It is formed in a state of projecting to the tank side. The area and volume of the upper opening of the first tank 9 are small compared with that of the second tank 10.
[0014]
3 and 4, the tank bottom 20 of the oil / water separation tank 8 has inclinations of angles α and β formed with a horizontal plane, and the inclination angles γ and δ formed with the intersection with the polyhedral partition wall inclined surface 14 as well. A gradient with is formed.
[0015]
The reason why the upper opening area of the first tank 9 is smaller than that of the second tank 10 and the lower polyhedral partition structure volume of the first tank 9 is larger than the upper opening volume of the first tank 9 is explained. To do.
[0016]
First, when the oil and fat separated and floated from the primary waste liquid that flows in has a constant volume, the bulk of the oil and fat layer diffuses thinly on the liquid surface of the oil and water separation tank with a large opening area. However, it will pump up a lot of the main component of the waste liquid. In order to avoid this phenomenon, the surface of the first tank having a small opening area is floated to increase the bulk of the formed oil and fat layer. As a result, the belt-type oil skimmer 5 has an effect of improving the efficiency of pumping up fats and oils.
[0017]
Second, when a certain amount of cold primary waste liquid is injected into the preheated storage primary waste liquid in the first tank 9, the cold primary waste liquid has a lower liquid temperature and higher density than the preheated storage primary waste liquid. Settling in one tank. The low-temperature primary waste liquid that settles diffuses inside the polyhedral structure partition inclined surface 14 of the first tank 9, and passes from the large-capacity second tank preheated storage primary waste liquid surrounding the first tank 9 through the polyhedral structure partition inclined surface. Absorbs the stored heat.
When heat transfer is performed, the larger the contact area between the low temperature side and the high temperature side, the faster the speed. In order to obtain the effect, the lower surface of the partition wall is increased in surface area, so that it has a polyhedral inclined surface structure, and the best inclination angles γ and δ are given.
[0018]
The third is that when the low temperature primary waste liquid absorbs heat from the surrounding preheated primary waste liquid and the heat transfer is in an equilibrium state, the oil droplets contained will rise faster than water because the specific heat is smaller than that of water. , The volume expands. As a result, the fat and oil droplet group has a reduced density and promotes separation and levitation. The separated and levitated oil droplet group collides with the inclined surface 14 of the polyhedral structure partition wall, coalesces by the surface tension, and the particle droplet grows greatly to increase buoyancy. The polyhedral structure partition inclined surface 14 has an effect of promoting the growth of the oil droplets and floating.
[0019]
When the partition wall material partitioning the oil / water separation tank 8 is formed of austenitic stainless steel, good results are obtained in terms of workability, corrosion resistance, and thermal conductivity. The boundary portion of each surface constituting the polyhedral structure partition inclined surface 14 has no unevenness, and the effect is further enhanced when the surface of each surface is mirror-finished.
[0020]
The process in which the contained fats and oils separate and float from the inflow cold / hot primary waste liquid will be described.
[0021]
A primary waste liquid having a volume indicated by the arrow (1) flows into the first oil-water separation tank 9. When the cold primary waste liquid flows into the stored primary waste liquid preheated to 50 to 60 ° C., the cold inflow primary waste liquid is larger than the density of the preheated stored primary waste liquid, and the inflow primary waste liquid passes through the first tank 9 in the oil / water separation tank. Settling.
[0022]
The cold / warm primary waste liquid absorbs heat from the preheated all-oil / water separation tank storage primary waste liquid in the process of sinking the inclined surface area of the polyhedral structure partition wall in the oil / water separation tank first tank 9, and heat transfer is performed. In order to promote this, the second tank 10 surrounds the first tank 9, and the polyhedral structure partition wall inclined surface area 14 is provided so that the contact area with the second tank 10 becomes large.
[0023]
Due to this influence, the cold and warm primary waste liquid that settles in the polyhedral structure partition inclined surface area of the first tank 9 absorbs heat from the preheated storage primary waste liquid through the partition inclined surface. When the heat transfer is in an equilibrium state, the fat and oil droplet group contained has a specific heat of fat and oil smaller than that of water, so that the droplet absorbs heat prior to water and expands its volume and the density decreases. As a result, separation and flotation are promoted from the primary waste liquid.
[0024]
From the flow arrow (2) of the primary waste liquid toward the water flow port 15, the oil droplets whose volume has expanded due to endothermic heat and whose density has been lowered floated due to the difference in specific gravity and are finished to a mirror-like surface with a gradient. Collides with the inclined surface 14. The collided groups of fat and oil droplets are united by surface tension to grow into large oil droplets, and the buoyancy is increased. Since the surface of the inclined surface of the polyhedral structure partition wall is in a mirror surface state, the oil droplets that have grown greatly float on the surface of the first tank 9 along the surface of the partition wall without adhering to the surface of the inclined surface of the partition wall structure. . This process is continuously performed, and the droplets are separated and floated from the primary waste liquid.
[0025]
In this way, the inclined surface 14 of the polyhedral structure partition wall is divided by the standing wall because it is necessary to extend the residence time of the cold primary waste liquid and to quickly transfer heat between the cold inflow primary waste liquid and the preheated storage primary waste liquid. A polyhedral partition wall structure having an inclined surface that obtains a large surface area has been adopted so that heat transfer can be performed quickly from the second tank 10, and the oil droplets contained in the primary waste liquid are ahead of the water due to the specific heat. As the volume is expanded and the volume expands, the density decreases and the particles float and separate, and the effect of accelerating the coalescence and oil droplet growth of the floating oil droplet groups is obtained. In this process, most of the contained fats and oils are separated and floated on the liquid surface of the first tank 9 from the primary waste liquid.
[0026]
The above is the effect obtained by the polyhedral structure partition inclined surface 14.
[0027]
The secondary waste liquid in which most of the contained fats and oils are separated and floated from the primary waste liquid to the liquid level of the first tank 9 flows into the second oil tank 10 having a large volume via the water inlet 15. It becomes a gentle flow that spreads in the width direction larger than the width of 15, and the remaining fat and oil droplet group contained floats on the liquid surface of the second tank 10 due to the difference in specific gravity, and coalesces and grows on the liquid surface to form an oil and fat layer.
[0028]
A means for generating bubbles in the second tank 10 for oil / water separation, for example, an electrolysis apparatus or a micro air nozzle for generating fine bubbles is installed to generate fine bubbles, and the fat and oil contained in the stored secondary waste liquid If it adheres to the fine bubbles generated in the droplets and floats on the liquid surface, an effect of increasing the oil and fat scavenging efficiency of the sub-belt type oil skimmer 13 can be obtained.
[0029]
The oil and fat layer that has floated on the liquid surface of the second tank 10 is returned to the oil receiving tray with the secondary waste liquid in order to maintain fluidity by the secondary belt-type oil skimmer 13 that can be arbitrarily adjusted in the operation cycle installed in the second tank 10. It is pumped up to 12. The return oil receiving tray 12 communicates with the waste liquid receiving tray 11, and the pumped oil and fat is injected into the first oil / water separation tank 9 together with the cold primary waste liquid flowing in.
[0030]
Since the oil and fat pumped up from the second tank 10 grows greatly in oil droplets, even if injected into the first tank 9 together with the cold and primary waste liquid, the existing floating oil and fat layer regardless of the flow of the cold and primary waste liquid described above. To increase the bulk of the existing fat layer. As a result, the efficiency with which the main belt type oil skimmer 5 pumps up oil and fats increases, and the oil and fats are stored in the recovery tank 7. The recovered fats and oils have sufficient purity to be effectively used as a secondary resource for producing fertilizers, feeds and the like.
[0031]
The auxiliary separator inlet 17 is provided by the effect that the inlet 17 of the auxiliary separator 16 that promotes oil / water separation provided in the second tank 10 is provided upward in the liquid surface direction of the second tank 10. Even if the secondary waste liquid flows in, the oil and fat droplets contained therein are not hindered from floating up toward the liquid surface of the second tank 10 against the flow of the secondary waste liquid.
[0032]
The operation of the auxiliary separator 16 provided in the oil / water separation tank second tank 10 will be described.
[0033]
The function of the auxiliary separator 16 will be described with reference to FIG. In FIG. 5, 16 is an auxiliary separator, and this auxiliary separator 16 is connected to a drain pipe 21 and provided with traps 17a, 17b, 19a, 19b for supporting oil / water separation by a swirling flow and specific gravity difference. Yes. The auxiliary separator 16 includes a main pipe 19 having a triple pipe structure and an inlet 17 having a double pipe structure. A conduit 25 connects the main pipe 19 and the lower end of the inlet 17. Reference numeral 18 denotes a branch pipe provided in the middle of the conduit 25. The branch pipe 18 is provided in order to allow the oil droplets separated from the secondary waste liquid flowing through the conduit 25 to escape to the liquid level of the branch pipe 18.
[0034]
The secondary waste liquid flows into the auxiliary separator 16 from the trap 17 a at the inlet 17. It flows while turning as shown by the arrow (8). Also in this process, the remaining oil droplet group is separated and floated toward the liquid surface. After that, as shown by an arrow (9), it flows into the auxiliary separator main pipe 19 from the trap 19a via the conduit 25. Even while passing through the conduit 25, the remaining oil droplet group continues to separate and float, the oil content continues to decrease, and becomes a tertiary waste liquid.
[0035]
The tertiary waste liquid that has flowed into the auxiliary separator main pipe 19 passes through the trap 19b while turning as indicated by an arrow (10), and the arrow starts from the upper end that becomes the upper liquid level of the branch pipe 26 of the auxiliary separator main pipe 19. As shown in (11), the water overflows and is drained from the drain port 21 to the grease interceptor of the terminal treatment apparatus.
[0036]
In the branch pipes provided at a plurality of locations in the auxiliary separator 16, a small amount of oil and fat floats from the secondary waste liquid and is stored. It has been confirmed through experiments at the development stage that no problem occurs.
[0037]
As shown in FIGS. 3 and 4, the bottom of the oil / water separation tank 8 has a gradient of angles α and β formed with a horizontal plane, and the gradient is provided so as to concentrate on the fine solid food residue discharge port 22.
[0038]
The fine solid food residue discharge port 22 is provided with a large-diameter valve, which causes the valve to be blocked when discharging the fine solid food residue deposited in the oil / water separation tank 8 during cleaning and inspection of the apparatus. No. Further, since the tank bottom 20 of the oil / water separation tank 8 is provided with a gradient so as to concentrate on the fine solid food residue discharge port 22, it is discharged in a short time with a flow along with the stored secondary waste liquid.
[0039]
The fine solid food residue discharge port 22 is not provided in a narrow space between the floor surface and the tank bottom 20. A fine solid food residue discharge port 22 is provided in a gap between the apparatus installed adjacent to the apparatus or the wall of the building. As a result, the operator can easily open and close the valve and check the discharge state of the fine solid food residue.
[0040]
【The invention's effect】
As described above, in the oil / water separation oil / fat recovery apparatus of the present invention, the built-in oil / water separation tank 8 is divided into the first tank 9 and the second tank 10. Since the upper opening area and the internal volume of the first tank 9 are formed smaller than that of the second tank, the following effects are possessed.
[0041]
The first is that the lower part of the vertical partition partitioning the first tank 9 and the second tank 10 is a polyhedral structure partition inclined surface 14, so that the cold primary waste liquid is injected into the preheated storage primary waste liquid in the first tank 9. Then, the heat storage propagates from the large-capacity second tank preheated storage primary waste liquid that diffuses inside the first tank 9 and surrounds the first tank 9 via the polyhedral structure partition wall inclined surface 14 having a large surface area. When heat transfer is performed, the heat transfer can be performed faster as the area of contact between the low temperature side and the high temperature side increases. In addition, fats and oils have a smaller specific heat than water and quick heat absorption, and the primary waste liquid-containing fat and oil droplets expand in volume and the density decreases. As a result, the effect of promptly separating and floating the fat droplets is obtained.
[0042]
Secondly, a group of oil droplets from which the low temperature primary waste liquid separates and floats from the surroundings collides with the polyhedral structure partition inclined surface 14 at the bottom of the partition partitioning the first tank 9 and the second tank 10, and the partition wall surface at that location Then, it coalesces by the surface tension, and the droplets grow large and increase buoyancy. The polyhedral structure partition inclined surface 14 promotes the growth of the oil droplets and obtains the effect of floating most of the primary waste liquid-containing oil and fat.
[0043]
Thirdly, most of the oil and fat that separates and floats from the inflowing primary waste liquid is collected on the liquid surface of the first tank 9 having a small opening area. Further, the oil and fat that has floated in the second tank 10 is also pumped up by the sub-belt type oil skimmer 13 and concentrated on the liquid surface of the first tank 9, so that the oil and fat layer in the first tank 9 becomes bulky, and the main belt type The area where the oil skimmer 5 comes into contact with the oil and fat increases, and the effect of improving the amount and efficiency of pumping up the oil and fat is obtained.
[Brief description of the drawings]
FIG. 1 is an external view of an oil / water separation oil collecting apparatus 1 of the present invention.
FIG. 2 is a top view of the internal structure with the built-in top plate 2, the cleaning tank 3 and the upper part of the wire mesh 4 removed.
FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2;
4 is a cross-sectional view taken along the line B-B in FIG. 2;
FIG. 5 is a front view of an auxiliary separator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil-water separation fat collecting apparatus 2 Top plate 3 Washing tank 4 Strainer 5 Main belt type oil skimmer 6 Heater 6A Heater case 7 Collection tank 8 Oil water separation tank 9 1st tank 10 2nd tank 11 Waste liquid receiving tray 12 Return oil receiving tray 13 Sub Belt-type oil skimmer 14 Polyhedral structure partition inclined surface 15 Water inlet 16 Auxiliary separator 17 Auxiliary separator inlet 17 a Trap 17 b Trap 17 c Inlet 17 d Inlet branch pipe 18 Auxiliary separator branch pipe 19 Auxiliary separator main pipe 19 a Trap 19 b Trap 19c Inlet 20 Oil-water separation tank bottom 21 Drain pipe 22 Fine solid food residue outlet 23 Waste liquid outlet 24 Guide plate 25 Pipe 26 Main branch branch

Claims (3)

An oil / water separation oil / fat recovery device provided in a path to a sink used in a restaurant kitchen and a grease interceptor which is a terminal treatment device, and the oil / water separation tank with a built-in oil / water separation oil / fat recovery device has an upper opening area and The first tank having a small volume and the second tank having both of them are partitioned by a standing partition, and the lower structure of the standing partition has an inclined surface of a polyhedral structure projecting from the first tank to the second tank side. formed, and a portion of the mating portion of the oil-water separation tank s bottom with a gradient toward the inclined surface and the fine solid food residue outlet of the polyhedral structure, passing between the second tank and the first tank water inlet From the waste liquid flowing from the first tank to the two tanks, most of the oil and fat is not diffused along the inclined surface of the polyhedral structure, and possesses the function of separating and floating on the liquid surface of the first tank. A built-in oil / water separation tank has a partition structure that is divided into the first tank and the second tank. Oil-water separator oil recovery device characterized by and. The built oil-water separation tank, an upper opening area and capacity a standing barrier rib substructure to which it and the first tank of small partitioned into a second tank of large, Zhang from the first tank to the second tank-side The polyhedral partition wall inclined surface having a large surface area with an inclined surface for discharging heat storage of the preheated waste liquid stored in the second large-capacity tank surrounding the first tank to the cold and waste liquid flowing into the first tank. The oil droplets containing cold waste liquid that has been rapidly propagated and endothermic / heated induces volume expansion and density reduction, and has the effect of floating on the first tank liquid surface along the inclined surface of the polyhedral structure partition wall. The standing partition lower part structure which has a polyhedral structure partition inclined surface used for the oil-water separation oil-fat collection | recovery apparatus of Claim 1 characterized by the above-mentioned. The oil / water separation oil / fat recovery apparatus according to claim 1, further comprising: a strainer for separating solid food residue from a liquid containing solid food residue and oil / fat on an upper surface of the built-in oil / water separation tank; A built-in cleaning tank having a flow path for water injection into the tank and a recovery tank for storing oil pumped up by the main belt type oil skimmer are detachably incorporated and stored, and separated and floated in the first tank. A main belt-type oil skimmer, which is always in operation to pump up most of the oil and fat, has an inlet provided in the second tank upward in the liquid surface direction of the second tank, and facilitates oil-water separation. returning the vessel and the specific gravity difference residual oil separated emerged from the waste liquid by the pumping said first tank, operating cycles arbitrarily adjustable auxiliary belt oil skimmer is provided, this which attained the oil recovery efficiency of the waste Was characterized, oil-water separation fat collecting apparatus according to claim 1 having the structure embedded cleaning tank at the top oil-water separation tank are integrally housed in the lower part.

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