JP6835342B1 - A grease interceptor and a fat recovery system equipped with the grease interceptor - Google Patents

Abstract

The grease interceptor 1 is connected to the oil-impregnated wastewater storage tank 11 in which the oil-impregnated wastewater flowing from the upstream side is temporarily stored and the downstream side of the oil-impregnated wastewater storage tank 11, and discharges the wastewater after the oil is separated. A trap pipe 12 and a PCM tank 13 filled with a latent heat storage material composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank 11 are provided. With this configuration, the grease interceptor 1 can minimize the oil outflow from the oil-containing wastewater.

Description

The present invention relates to a grease interceptor installed in a store or the like that discharges oil-containing wastewater, and an oil-and-fat recovery system that efficiently recovers oil from oil-containing wastewater.

Kitchen wastewater in small businesses such as restaurants, fast food restaurants, restaurants, hotels, and food processing plants contains various water pollutants. If such wastewater is drained without any treatment, oil and the like in the wastewater will adhere to the drain pipe and solidify, resulting in clogging. As a result, it may be difficult to purify water in the merged treatment tank or sewage treatment plant, adversely affect the environment, and be subject to legal restrictions, which may make it impossible to continue business. Therefore, various methods and devices for treating wastewater containing solids such as oil, precipitates, and suspended matter at each discharge business site have been proposed.

One of the methods is a method or device for physically removing oil in wastewater by pooling oil-containing wastewater, pumping out floating oil in the upper layer, adsorbing it with an adsorbent, and filtering it. .. However, with this method and equipment, a foul odor is generated from (pool) of wastewater, the separation and removal of oil tends to be incomplete, and a large system and equipment are required.

In addition, as an efficient and economical treatment technology that can be adopted at each of the above-mentioned small-scale business establishments that discharge oil-containing wastewater in response to the recent social trends in response to environmental problems, oil and sediment wastewater from oil-containing wastewater can be disposed of. An apparatus for efficiently transferring, removing, and purifying an object is disclosed (see, for example, Patent Document 1). Further, an oil separation / management device including a control device having an oil sensor and data transmission / reception means and efficiently recovering oil from oil-containing wastewater is also disclosed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2006-7092 Utility model registration No. 3216173 Gazette

Generally, a device for temporarily pooling oil-containing wastewater is called a grease trap (or Grease Trap). The grease interceptor separates and collects oils and fats, leftover food, vegetable waste and other residues contained in the drainage, clogs the drainage port and water pipes, and prevents oils and residues from flowing directly into the sewage.

For businesses that produce oily wastewater, the installation of grease interceptors is obligatory under the Building Standards Law and local government ordinances. In addition, the maintenance of grease interceptors is stipulated by the "Technical Standards for Water Supply and Drainage Equipment" and the "Standards of the Air Conditioning and Sanitation Engineering Society", and complies with the Water Pollution Control Law, Sewerage Law, Food Sanitation Law, Building Management Law, etc. There is a need.

In recent years, along with the 2020 Tokyo Olympics and the 2025 Osaka Expo, the opening of large-scale commercial facilities by major developers and the development of stores in the station premises of major railway companies have become active. There are many eating and drinking tenants in the commercial facility, and grease interceptors are always installed in the kitchen.

However, the current grease interceptor has the following problems. That is, in the grease interceptor currently installed in stores in commercial facilities, the floating oil in the interceptor is washed away by the amount of water flowing in, such as when the water accumulated in the sink is flushed at once, and flows out into the sewage. A phenomenon occurs. In particular, most of the grease interceptors currently used are shallow type with a water depth of about 5 to 15 cm, and this shallow type grease interceptor tends to allow floating oil to flow out. As a result, as a practical matter, water leakage accidents due to pipe clogging caused by oil outflow from the grease interceptor frequently occur. For example, in March 2015, a water leak accident occurred at Ecute, Omiya Station, Saitama Prefecture, and measures to prevent or prevent this water leak have become social issues.

In recent years, the problem of global warming has become more serious, and greenhouse gases such as carbon dioxide and methane gas have been reduced, and renewable energy that reuses natural energy and waste has been attracting attention. Wastewater oils and fats, which are biomass resources discharged from restaurants and food factories, amount to more than 300,000 tons per year throughout Japan, which is even greater when the world is taken into consideration. In recent years, a system has been developed in which a unique biomass fuel is produced from wastewater oil and fat, which had to be disposed of as sludge, and biomass power is generated by a diesel generator. Providing this biomass power generation system can bring about CO2 reduction, recycling, and water purification. That is, there is an urgent need to establish a technology for efficiently collecting wastewater oils and fats discharged from restaurants and food factories and using them as a new renewable energy source.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a grease interceptor capable of minimizing the outflow of oil from oil-containing wastewater. Another object of the present invention is to provide an oil / fat recovery system equipped with this grease interceptor, which can more efficiently recover only oil from oil-containing wastewater.

In order to achieve the above object, the present invention is a grease interceptor for separating fats and oils from oil-impregnated wastewater, which comprises an oil-impregnated wastewater storage tank for temporarily storing oil-containing wastewater flowing from the upstream side and the oil-containing wastewater storage tank. It is possible to exchange heat between the trap pipe that is connected to the downstream side of the wastewater and discharges the wastewater after the oil is separated, and the oil-containing wastewater that is arranged on the outer periphery of the oil-impregnated wastewater storage tank and is stored in the oil-impregnated wastewater storage tank. A PCM tank filled with a latent heat storage material (PCM) composition is provided, and the grease interceptor is further adjacent to the outside of the oil-impregnated wastewater storage tank in the internal space of the PCM tank. It is characterized by including a water flow pipe arranged in such a manner.

In this grease interceptor, the oil-impregnated wastewater storage tank has a substantially rectangular shape with an open upper surface, and the PCM tank is arranged so as to surround at least the bottom surface and the long side surface of the oil-impregnated wastewater storage tank from the outside, and is vertical. An outer frame having a concave cross section, a concave surface formed so as to extend inward on both ends in the longitudinal direction of the outer frame, an upper edge of the outer frame, and the oil-impregnated wastewater storage tank. A cover plate attached to the upper side surface of the outer frame body is provided to cover a slit-shaped opening formed between the long side surface of the PCM tank, and the latent heat storage material of the PCM tank is the oil-impregnated wastewater storage tank. It is preferable to fill the internal space formed between the outer frame and the concave surface.

In this grease interceptor, the cover plate has a substantially L-shaped vertical cross section, and the cover plate has a PCM injection port for injecting PCM on one end side of the upper surface thereof and water supply on the other end side. It is preferable to provide a water supply port.

In this grease interceptor, it is preferable that the grease interceptor further includes a water flow pipe arranged so as to be adjacent to the outside of the oil-impregnated wastewater storage tank.

In this grease interceptor, the water flow pipe is arranged in the internal space of the PCM tank, and the water flow pipe has a concave shape in a side view and is arranged so as to face each other with a pair of header pipes. It is preferable that the header pipes are composed of a plurality of water pipes arranged side by side in a direction orthogonal to the header pipes.

In order to solve the above problems, the present invention is a grease interceptor for separating fats and oils from oil-impregnated wastewater, which comprises an oil-impregnated wastewater storage tank for temporarily storing oil-containing wastewater flowing from the upstream side and the oil-impregnated wastewater storage. It is possible to exchange heat between a trap pipe that is connected to the downstream side of the tank and discharges wastewater after the oil is separated, and oil- containing wastewater that is installed in the oil-impregnated wastewater storage tank and stored in the oil-impregnated wastewater storage tank. the phase change material: with a PCM tank (PCM Phase Change material) composition is filled, and the PCM cell is characterized plate PCM Sodea Rukoto the PCM is filled therein.

In this grease interceptor, it is preferable to use a latent heat storage material whose phase changes in the range of 40 to 45 ° C. as the latent heat storage material filled in the PCM tank.

In order to solve the above problems, the present invention is an oil / fat recovery system for recovering oil / fat from oil-containing wastewater, via a pipe on the downstream side of the grease interceptor and the trap pipe of the grease interceptor. Separation and recovery of floating oil from at least one of the oil and fat outflow prevention tank that is connected and temporarily re-storing the wastewater from the trap pipe and the oil-containing wastewater stored in the grease interceptor and the oil and fat outflow prevention tank. It is characterized by comprising a device.

In this oil / fat recovery system, the oil / fat outflow prevention tank has a substantially rectangular parallelepiped shape with an open upper surface, a pipe connection port for connecting to the pipe is formed on the upstream side surface, and a drainage pipe is formed on the downstream side surface. It is preferable that a discharge pipe connected to is arranged.

In this oil / fat recovery system, the oil / fat separation / recovery device stores a schema for sucking oil-containing wastewater from the oil-containing wastewater storage tank or the oil-fat outflow prevention tank provided in the grease interceptor, and the oil-containing wastewater sucked by the schema. the oil separation collector arranged inside of those oil-water separation and recovery device, and a return portion which oil in the oil separation collector to discharge the separated waste water with the oil-containing wastewater storage tank or the oil outflow prevention tank, It is preferable to provide.

In order to solve the above problems, the present invention is arranged in an oil-impregnated wastewater storage tank provided in a grease interceptor for separating oils and fats from oil-impregnated wastewater, and a latent heat storage material ( PCM : Phase Change Material) is filled therein. It is a plate-shaped PCM tank characterized by.

A grease interceptor for separating oils and fats from oil-impregnated wastewater according to the present invention, which is connected to an oil-impregnated wastewater storage tank for temporarily storing oil-containing wastewater flowing from the upstream side and an oil-containing wastewater storage tank for oil components. It is provided with a trap pipe for discharging the wastewater after the wastewater is separated, and a PCM tank filled with a latent heat storage material composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank. With this configuration, the grease interceptor according to the present invention can minimize the outflow of oil from the oil-containing wastewater.

It is a perspective view of the grease interceptor which concerns on Embodiment 1 of this invention. (A) Cross-sectional view of the grease interceptor AA, (b) Plan view of the grease interceptor, (c) Side view of the grease interceptor, (d) Right side view of the grease interceptor, (e). ) Same as above It is a reference enlarged view of the water supply port provided in the grease interceptor. (A) An exploded perspective view of the PCM tank provided in the grease interceptor, (b) a perspective view of the PCM tank of the same as above, (c) a top view of the cover plate constituting the PCM tank of the same as above, and (d) a perspective view of the cover plate of the same as above. Is. (A) Reference view showing the arrangement of header pipes and water pipes constituting the water supply pipe provided in the grease interceptor, (b) Right side view of the water supply pipe, (c) Front view of the water supply pipe, (d). It is an enlarged reference diagram of the water supply port connected to the water supply pipe as above. It is a perspective view of the grease interceptor and the oil and fat outflow prevention tank as above. (A) A reference plan view of the grease interceptor and the oil / fat outflow prevention tank as above, and (b) a front view of the grease interceptor and the oil / fat outflow prevention tank of the same as above. (A) Top view of the oil and fat outflow prevention tank, (b) Plan view of the manhole, (c) Cross-sectional view of the oil and fat outflow prevention tank and the manhole in line BB, (d) Same as above, C of the oil and fat outflow prevention tank and the manhole. -C line sectional view. It is explanatory drawing of the fats and oils separation and recovery apparatus provided in the fats and oils recovery system. It is a perspective view of the grease interceptor which concerns on Embodiment 2 of this invention. It is a reference figure which shows the temperature change of the 2nd tank in the test 1 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change of the 2nd tank in the test 1 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change of the 2nd tank in the test 2 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change of the 2nd tank in the test 2 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change of the 2nd tank in the test 3 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change of the 2nd tank in the test 3 of the high temperature drainage test of Experimental Example 1. It is a figure which shows the transition of the temperature change of the 2nd tank in the test 1 to 3 of the high temperature drainage test of Experimental Example 1. It is a reference figure which shows the temperature change in the oil outflow test at the time of high-concentration drainage of Experimental Example 2. It is a reference figure which shows the temperature change in the oil outflow test at the time of low-concentration discharge of Experimental Example 2.

(Embodiment 1)
The grease interceptor according to the first embodiment of the present invention and the oil / fat recovery system including the grease interceptor will be described with reference to FIGS. 1 to 8. High-temperature oil-impregnated wastewater flowing from kitchens and the like impedes the oil-water separation function of grease interceptors, and is one of the main causes of oil flowing out to drainage pipes and the like, causing pipe clogging. Therefore, in the grease interceptor according to the first embodiment, a function of efficiently lowering the temperature of high-temperature oil-containing wastewater is added to minimize oil outflow.

First, the overall structure of the grease trap (GT: Grease Trap) according to the first embodiment will be described with reference to FIGS. 1 and 2. The grease interceptor 1 is a device that temporarily pools oil-containing wastewater, separates and collects oils and fats contained in wastewater, leftover food, vegetable waste, and other residues, clogs drains and water pipes, and clogs oils and residues. Prevents water from flowing directly into the sewage.

The grease interceptor 1 is a device for separating oils and fats from oil-impregnated wastewater, and includes an oil-impregnated wastewater storage tank 11, a trap pipe 12, and a PCM (Phase Change Material) tank 13. The oil-impregnated wastewater storage tank 11 temporarily stores the oil-impregnated wastewater that has flowed in from the upstream side such as a kitchen. The trap pipe 12 is connected to the downstream side of the oil-impregnated wastewater storage tank 11 and discharges the wastewater after the oil is separated. The PCM tank 13 is filled with a latent heat storage material composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank 11.

As shown in FIG. 1, the oil-impregnated wastewater storage tank 11 has a substantially rectangular parallelepiped shape with an open upper surface, and a wire mesh basket B for removing kitchen garbage, leftover food, etc. is arranged in the internal space of the first tank 1a. The first tank 1a has a second tank 1b partitioned by a partition plate 11a to separate water and oils and fats, and the second tank 1b has a third tank 1c partitioned by a partition plate 11b. A trap pipe 12 is arranged in the third tank 1c, and water having a low oil content is flowed to the downstream side. The grease interceptor 1 has, for example, a size of about 1380 (mm) in width × 500 (mm) in width × 200 (mm) in height, and has a capacity of 138 L.

As shown in FIG. 3, the PCM tank 13 includes an outer frame body 13a, a concave surface 13a', and a cover plate 13b. The outer frame 13a is arranged so as to surround at least the bottom surface and the long side surface of the oil-impregnated wastewater storage tank 11 from the outside, and has a concave vertical cross section. The concave surface 13a'is formed so as to extend inward on both end sides of the outer frame body 13a in the longitudinal direction. The cover plate 13b is attached to the upper side surface of the outer frame body 13a by welding or the like to cover the slit-shaped opening formed between the upper edge of the outer frame body 13a and the long side surface of the oil-impregnated wastewater storage tank 11. Then, the latent heat storage material of the PCM tank 13 is filled in the internal space formed between the oil-impregnated wastewater storage tank 11 and the outer frame body 13a and the concave surface 13a'. Further, the oil-impregnated wastewater storage tank 11 is fitted from the upper surface of the outer frame body 13a.

The cover plate 13b has a substantially L-shaped vertical cross section due to bending, and the PCM injection port 13c for injecting PCM on one end side of the upper surface (one surface) and the water supply port 13d for water supply on the other end side. Has. Sockets are used for the PCM inlet 13c and the water supply port 13d.

The internal space of the PCM tank 4 is filled with the latent heat storage material composition from the PCM inlet 13c. With this configuration, high-temperature oil-impregnated wastewater can be quickly cooled. Here, the latent heat storage material is a substance that utilizes the release / absorption of heat accompanying the phase change of a substance, and when it changes to a solid / liquid state toward the melting point / freezing point (phase transition temperature). The latent heat storage material maintains an almost constant temperature. Further, the latent heat storage material has a characteristic that it can retain a heat storage amount many times larger than that of water or concrete at room temperature.

In particular, as the latent heat storage material PCM filled in the internal space of the PCM tank 13 in the first embodiment, it is preferable to use a heat storage material whose phase changes mainly in the range of 40 to 45 ° C. As a result, the latent heat storage material exchanges heat with the oil-impregnated wastewater that has flowed into the oil-impregnated wastewater storage tank 11 of the grease interceptor 1, and the oil-impregnated wastewater storage tank is kept at 40 to 45 ° C. to suppress the temperature rise of the oil-impregnated wastewater storage tank. , Oil-containing wastewater can be cooled quickly.

Each latent heat storage material has its own unique phase change temperature, and the phase change temperature can be adjusted by blending a melting point adjuster of the latent heat storage material so as to match the target temperature in the manufacturing process. The latent heat storage material composition used in the grease interceptor 1 according to the first embodiment has, for example, sodium sulfate 10-hydrate, calcium chloride 6-hydrate, and carbonate as main raw materials (actually undergoing phase change to absorb and dissipate heat). Inorganic hydrates such as sodium monohydrate, disodium hydrogen phosphate 10 hydroxides, sodium thiosulfate 5 hydroxides, and sodium acetate trihydrate, and organic materials such as paraffin wax and polyethylene glycol can be used. .. Examples of the melting point adjusting material (material for adjusting the phase change of the main raw material at a target temperature) include water, urea, ammonium chloride, ammonium sulfate, ammonium bromide, sodium chloride, potassium chloride, and sodium bromide. One type or a mixture of two or more types of the above can be used. Further, examples of the supercooling preventive material (material for reliably precipitating crystals at a temperature near the freezing point) include sodium tetraborate, sodium pyrophosphate, disodium phosphate, lithium fluoride, barium chloride, and strontium chloride. One or a mixture of two or more of the above can be used. Further, as a phase separation preventing material (a material for preventing phase separation due to a difference in specific gravity), for example, one or more of sodium polyacrylate, polyacrylamide, carboxymethyl cellulose, attapulsite, sepiolite and the like are mixed. Can be used.

When the response experiment of the latent heat storage material is continued with a thermostat at the test tube level, the degree of deterioration is less than 10% when the phase change is 10,000 times or more, and it depends on the usage conditions, but in the PCM tank 13 provided in the grease interceptor 1. The latent heat storage material to be filled is expected to be usable for 30 years.

Next, the water flow pipe provided in the grease interceptor 1 will be described with reference to FIG. In the internal space of the PCM tank 13 of the grease interceptor 1, a water flow pipe 14 is arranged so as to be adjacent to the outside (here, the bottom surface and the long side surface) of the oil-impregnated wastewater storage tank 11. As shown in FIG. 4, the water flow pipe 14 is composed of a header pipe 14a and a water supply pipe 14b. The header pipe 14b is connected to the water supply port 13d and is arranged so as to have a concave shape in a side view and face each other in order to supply tap water to a plurality of water pipes 14b (for example, a flexible pipe) by a header method. .. The water pipes 14b are connected to the header pipes 14a, and a plurality of water pipes 14b are arranged side by side between the pair of header pipes 14a in a direction orthogonal to the header pipes 14a. One header pipe 14a is arranged on the water supply side, and the other header pipe 14a is arranged on the drainage side, and the oil-impregnated wastewater storage tank 11 of the grease interceptor 1 is stored while tap water or the like passes through the running water pipe 14. Circulating water (warm water) warmed by high-temperature wastewater is discharged from the water supply port 13d on the drain side. Here, the distance between the water pipes 14b arranged side by side is, for example, 50 mm, and with this configuration, tap water flowing inside the water pipes 14b can be efficiently made into hot water.

The arrangement of the header pipe 14a and the water supply pipe 14b constituting the water supply pipe 14 shown in FIG. 4 is an example, and may have a structure capable of supplying water with high heat exchange efficiency (large surface area, etc.). When a flexible tube is used, the material of the flexible tube is preferably aluminum or copper, or SUS (austenitic) 304 or 316, which has corrosion resistance, in terms of thermal conductivity. Flexible tubes are generally thin products and can also be used as heat exchange materials.

Next, the structure of the oil / fat outflow prevention tank 2 (BT: Binary Trap) will be described with reference to FIGS. 5 to 7. The oil and fat outflow prevention tank 2 is connected to the downstream side of the trap pipe 12 of the grease interceptor 1 via a pipe 4, and has a function of temporarily re-storing the wastewater from the trap pipe 12 and causes an oil outflow. Ensure prevention of. The oil and fat outflow prevention tank 2 is a small storage tank as compared with the grease interceptor 1 located below the manhole 5, and is, for example, a width dimension 410 (mm) × width dimension 500 (mm) × height dimension. It has a size of about 240 (mm) and a capacity of 50 L. In the first embodiment, the oil / fat outflow prevention tank 2 has a substantially rectangular parallelepiped shape with an open upper surface, a pipe connection port 2a for connecting to the pipe 4 is formed on the upstream side surface, and the downstream side surface has a pipe connection port 2a. A discharge pipe 2b connected to the sewer pipe is arranged. Here, since the residue such as leftover food and vegetable waste does not flow into the oil / fat outflow prevention tank 2, the mouth of the discharge pipe 2b is directed diagonally downward, and the wastewater is surely discharged to the sewer pipe.

Next, the oil / fat recovery system S according to the first embodiment will be described. The oil / fat recovery system S is a system for efficiently recovering oil / fat from oil-containing wastewater, and includes a grease interceptor 1, an oil / fat outflow prevention tank 2, and an oil / fat separation / recovery device 3 shown in FIG. The details of the oil / fat separation / recovery device 3 will be described with reference to FIG.

The oil / fat separation / recovery device 3 (trade name: Kankichi-kun Jr. (registered trademark)) is a device that is retrofitted to at least one of the existing grease interceptor 1 and the oil / fat outflow prevention tank 2 to recover floating oil. , Maintain and prolong the performance of grease interceptor 1. The oil / fat separation / recovery device 3 does not operate during the time when the amount of drainage is large, but prevents the outflow of oil by the blocking function of the grease interceptor 1 or the like, and operates intermittently during the time when the amount of drainage is small. Collect the oil. The oil / fat separation / recovery device 3 sucks at least (1) the floating oil in the grease interceptor 1 and the oil / fat outflow prevention tank 2 by the floating type schema 31 (water absorption unit), and (2) in the oil / fat separation / recovery unit 32. (3) Schema 31 is installed near the water surface of the grease interceptor 1 and the oil / fat outflow prevention tank 2 with an upward opening in order to efficiently suck oil, and grease is separated by floating using the difference in specific gravity. In order to guide the floating oil that is biased to the wall surface of the interceptor 1 and the oil / fat outflow prevention tank 2 to the water absorption part, the wastewater after the oil / water separation is returned to the grease interceptor 1 and the oil / fat outflow prevention tank 2 (return unit 33). Have.

Specifically, the outline of the operation of the oil / fat separation / recovery device 3 will be described. In FIG. 8, when the motor is switched on, for example, the wastewater discharged to the oil-impregnated wastewater storage tank 11 mainly goes around the water surface in the oil-impregnated wastewater storage tank 11, hits the obstacle plate near the suction port, and swirls, and (floating) wastewater. A large amount of oil-containing wastewater is efficiently sucked from the suction unit (schema 31) and introduced into the oil-containing wastewater introduction oil separation chamber arranged inside the oil-water separation and recovery device 3. At this time, the oil layer floats upward because its specific gravity is lighter than that of water, and the wastewater in the lower layer moves from the oil-containing wastewater introduction oil separation chamber to the wastewater chamber through the notch of the vertical partition plate (oil / fat separation / recovery unit 32). When the wastewater reaches the wastewater discharge port on the upper side wall of the wastewater chamber, the wastewater is discharged to the oil-containing wastewater storage tank 11 (return unit 33) by the suction of the pump. As a result, oil is gradually accumulated in the oil / fat separation / recovery unit 32.

In the oil / fat separation / recovery unit 32, when the oil layer is accumulated near the oil sensor and changes from the wastewater layer to the oil layer, the oil sensor is turned “ON” to output an oil detection signal, which is automatically preset. A notification message may be sent to the destination. The person in charge who received the message goes to each business site, stops the circulation of the oil-containing wastewater, and then uses a vacuum device or the like to collect the oil-containing wastewater in the oil-fat separation / recovery unit 32 of the oil-fat separation / recovery device 3. You can recover the oil you have.

As described above, the grease interceptor 1 according to the present embodiment is connected to the oil-impregnated wastewater storage tank 11 in which the oil-impregnated wastewater flowing from the upstream side is temporarily stored and the downstream side of the oil-impregnated wastewater storage tank 11. A trap pipe 12 for discharging the wastewater after the oil is separated, and a PCM tank 13 filled with a latent heat storage material composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank 11. Be prepared. With this configuration, the function of efficiently lowering the temperature of high-temperature oil-containing wastewater (lowering the temperature of high-temperature wastewater) is added, and the oil outflow from the oil-containing wastewater is minimized (more preferably, the oil outflow rate is less than 10%). it can. As a result, the grease interceptor 1 suppresses pipe clogging caused by oil content and reduces water leakage accidents, thereby reducing accident treatment and water treatment costs and preventing loss of business opportunities.

Further, by using the oil / fat recovery system S composed of the grease interceptor 1, the oil / fat outflow prevention tank 2, and the oil / fat separation / recovery device 3, only the oil content can be recovered more efficiently and automatically from the oil-containing wastewater. That is, the oil / fat separation / recovery device 3 can efficiently recover the wastewater oil / fat from the grease interceptor 1 and the oil / fat outflow prevention tank 2. This recovered wastewater oil can be used as a biomass resource for energy, and the biofuel produced from the wastewater oil can be used for (a) diesel power generation, (b) fuel for boilers, incinerators, etc., and is a renewable energy. As a result of CO2 reduction, recycling and water purification.

Further, for example, in the case of only the grease interceptor of the existing product, there are problems such as an oil outflow rate of 60%, a heavy work load on the store, and a high cost. Even if an oil / fat separation / recovery device is used for the grease interceptor of the existing product, the oil outflow rate is 30%, it cannot be used for the shallow GT, and cost is required. On the other hand, when the oil / fat recovery system according to the first embodiment is used, the oil outflow rate is less than 10%, it can be used even in a shallow GT, and the cost can be significantly reduced.

Furthermore, it is also necessary to standardize the products in order to have the grease interceptor 1 incorporated from the design stage at the time of new opening and renewal of commercial facilities and stores. For example, in the installation type for each individual store, the oil separation system S consisting of SHASE-certified grease interceptor 1 + oil and fat outflow prevention tank 2 + oil and fat separation and recovery device 3 is introduced to ensure the appropriate capacity of the oil and fat outflow prevention tank 2 + the appropriateness of the entire system. Perform standardization to produce. On the other hand, in the multi-store joint installation type, the SHASE-certified grease interceptor 1 is installed at each store + a common oil / fat outflow prevention tank 2 + oil / fat separation / recovery device 3 is used, and the appropriate capacity of the oil / fat outflow prevention tank 2 and the oil / fat separation / recovery device 3 are used. It is also possible to design the storage tank section 20 to 50 L in size and standardize it to produce the appropriateness of the entire grease recovery system.

(Embodiment 2)
The grease interceptor according to the second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted (the same applies hereinafter).

In the second embodiment, the PCM tank is a plate-shaped PCM tank 6 filled with PCM inside, for example, a stainless steel plate-shaped container filled with PCM. The PCM to be filled is the same as that of the first embodiment. As a method of use, by throwing this plate-shaped PCM tank 6 into (the bottom) of the oil-impregnated wastewater storage tank 11 (bottom), the temperature of the high-temperature wastewater is low, as in the grease interceptor 1 according to the first embodiment described above. Can be achieved. In particular, the plate-shaped PCM tank 6 according to the second embodiment is suitable for use in an FRP grease interceptor or an existing grease interceptor.

<Experimental example 1>
Next, the temperature change (high temperature wastewater test) of the oil-containing wastewater in the storage tank 11 when the grease interceptor 1 (hereinafter referred to as GT) according to the first embodiment is used will be verified. This experiment is based on the certification test of the Japan Society for Air Conditioning and Sanitation Engineering (SHASE), and is carried out based on the same test equipment and environment as the certification test equipment and the certification test conditions.

In this experiment, i) normal GT (that is, conventional GT without PCM tank 13) test (test 1), ii) new GT (PCM tank only, no water supply pipe or no water supply pipe) Test (Test 2), iii) Test (Test 3) of the new GT (PCM + water supply pipe). The test environment is designed so that the room temperature is 20 ° C, the inflow water volume is 85 L / min, the GT storage capacity is 60 L, and the heat exchange temperature of the PCM is 45 ° C.

The outline of Test 1 is "Understanding the reference capacity at the time of high temperature wastewater inflow by normal GT", and the inflow water temperature is 60 ° C. The test procedure is as follows: (1) Fill the normal GT with water and control it to 20 ° C, (2) Install a temperature logger near the inlet and outlet of the normal GT, (3) Inflow x 5 times, After that, let it cool down. (4) In (3) above, measure the water temperature in the second tank (logger once / minute, actually measured once / 10 minutes), (5) actually measured, the water temperature is 40 ° C. If it falls below, the process ends. The results of the temperature change of the second tank in Test 1 are shown in Table 20 of FIG. 10 and Table 21 of FIG.

The outline of Test 2 is "Understanding the capacity of the heat storage material when the high temperature wastewater flows in by the new GT", the inflow water temperature is 60 ° C, and the test device is the new GT (there is a PCM tank 13 and there is no cooling water to the water supply pipe). .. The test procedure is the same as in Test 1 described above. The results of the temperature change of the second tank in Test 2 are shown in Table 22 of FIG. 12 and Table 23 of FIG.

The outline of Test 3 is "Understanding the heat storage material + cooling water capacity at the time of high temperature drainage inflow by the new GT", the inflow water temperature is 60 ° C, and the test equipment is the new GT (there is a PCM tank 13 and it is attached to the water supply pipe. With cooling water (8L / min)). The test procedure is as follows: (1) After the completion of test 2, add cooling water (8L / min), and (2) confirm that the heat storage material has returned to the normal state by judging the temperature of the heat storage material, etc., and (3) ) The following is the same as (1) to (5) of Test 1. The results of the temperature change of the second tank in Test 3 are shown in Table 24 of FIG. 14 and Table 25 of FIG.

Then, the time course of the temperature in these tests 1 to 3 is shown in the graph of FIG. The temperature change near the inflow port is 101,201,301, the temperature change in the second tank is 102,202,302, and the temperature change near the outflow port is 103.,203,303. As a result of this experiment, the time required for the temperature of the second tank to reach 40 ° C. or lower was 108 minutes in Test 1, 82 minutes in Test 2, and 87 minutes in Test 3. Also, compared to the normal GT (Test 1), the new GT has a slower temperature rise in (i) GT when the high temperature drainage GT flows in: 14 ° C or more lower than the normal GT at the end of the first inflow. That, (ii) The temperature inside the GT drops faster: It can be seen that the temperature dropped to 45 ° C 40 minutes earlier than the normal GT. From the above results, it was confirmed that the new GT can suppress the temperature rise of the oil-containing wastewater in the storage tank and can lower the temperature of the high-temperature wastewater faster than the normal GT. In this test, the PCM mounted in the PCM tank 13 was designed and manufactured so as to exchange heat at 45 ° C. However, by designing and manufacturing the heat exchange temperature of the PCM at 40 ° C and mounting it, further effects can be obtained. You can expect it.

<Experimental example 2>
Next, an oil outflow (oil removal ability) test was conducted. The outline of this Experimental Example 2 is "Understanding the oil removal capacity of the new GT + oil and fat outflow prevention tank (hereinafter referred to as BT)", the inflow water temperature is 40 ° C, the test equipment is the new GT + BT + oil and fat separation and recovery equipment, and there is cooling water ( 8L / min). Here, the following two high-concentration drainage tests and low-concentration drainage tests were performed.

The test procedure for the high-concentration drainage test is as follows: (1) Add cooling water after the above test 3 is completed (8L / min), and (2) The heat storage material returns to the normal state based on the judgment of the temperature of the heat storage material. Confirm that, (3) Put 29,619g of grease for 70 times into the two GT chambers, (4) Install temperature loggers near the inlet, BT inlet, and outlet of the new GT, ( 5) Grease concentration 0g / L x 5 times inflow, confirm that there is no oil in the outflow from GT, (6) Grease concentration 5g / L x 5 times inflow (a: 85L x 5g x 5 times = 2125g), (7 ) Attach an oil / fat separation / recovery device (registered trademark: Kankichi-kun Jr.). To recover the grease and measure the recovered grease weight b. (8) Measure the grease weight c that has flowed out of the BT, (9) ) Measure the grease weight d remaining in the BT, (10) Measure the water temperature in (6) to (8) above (1 time / minute for logger, 1 time / 10 minutes for actual measurement), (11) The procedure is calculation. The calculation here is: BT inflow grease amount: b + c + d, GT grease removal rate: (a− (b + c + d)) / a, BT grease removal rate: (b + c) / (b +) c + d), recovery rate in the oil / fat separation / recovery device 3: b / (b + c + d).

The transition of the temperature change in the high-concentration wastewater test is shown in Table 26 of FIG. Here, the changes over time in the water temperature near the GT inflow port (° C), the water temperature near the BT inflow port (° C), and the water temperature near the BT outflow port (° C) are shown. The water temperature measurement logger is once / minute, and the actual measurement is once / 10 minutes.

The calculation results of the high-concentration drainage test show that the amount of oil input for 70 times was 29619 g, the amount of high-concentration oil input (a = 2125 g), and the amount of oil recovered by the oil separation and recovery device 3 (b = 42.4 g (here, the following). (Calculated from the actual recovery rate of the oil / fat separation / recovery device 3 in the test (low concentration drainage test)), the amount of oil spilled from the BT (c = 66 g), the amount of oil spilled from the BT at the end of the inflow 65 g, the oil / fat separation / recovery device 3 1 g of oil that spilled when operating, the amount of oil remaining in BT (d = 8.1 g), 50.5 g of oil remaining in BT at the end of inflow, and the amount of oil remaining after operating the fat separation and recovery device 3. Oil content 8.1g, BT inflow oil amount (b + c + d = 116.5g), GT oil removal rate (a-(b + c + d) /a=94.5%), BT oil removal rate ((b +) d) / (b + c + d) = 43.3%), recovery rate of oil separation and recovery device 3 (b / (b + c + d) = 36.4%, real recovery rate of oil separation and recovery device 3 83.9%) there were.

The test procedure for the low-concentration wastewater test is to replace the grease concentration of 5 g / L with the grease concentration of 0.3 g / L (a: 127.5 g) in the procedures (5) to (10) of the high-concentration wastewater test.

The transition of the temperature change in the low-concentration wastewater test is shown in Table 27 of FIG. Here, the changes over time in the water temperature near the GT inflow port (° C), the water temperature near the BT inflow port (° C), and the water temperature near the BT outflow port (° C) are shown. The water temperature measurement logger is once / minute, and the actual measurement is once / 10 minutes.

The calculation results of the low concentration drainage test are the amount of oil input for 70 times 29619 g, the amount of low concentration oil input (a = 127.5 g), and the amount of oil recovered by the oil separation and recovery device 3 (b = 75.5 g (Test 5 (low concentration)). ), The amount of oil that spilled from BT (C = 89.5 g), the amount of oil that spilled from BT at the end of the inflow was 88.5 g, and the oil and fat separation and recovery device 3 was operated. The amount of oil that sometimes flowed out was 1 g, the amount of oil that remained in the BT (d = 14.5 g), the amount of oil that remained in the BT at the end of the inflow was 90 g, and the amount of oil that remained after the fat separation and recovery device 3 was operated 14.5 g. , BT inflow oil amount (b + c + d = 179.5g), GT oil removal rate (a− (b + c + d) / a = -40.8%), BT oil removal rate ((b + d) / ( b + c + d) = 50.1%), the recovery rate of the oil / fat separation / recovery device 3 (b / (b + c + d) = 42.1%, and the actual recovery rate of the oil / fat separation / recovery device 3 was 83.9%.

From the above oil spill test, 50% of the oil spilled from GT can be trapped in the oil spill prevention tank 2 (BT) regardless of whether it is high-concentration drainage or low-concentration drainage. It turned out that it can be recovered in 3. That is, it was clarified that the mechanism of the oil / fat recovery system S according to the first embodiment can minimize the oil outflow. Since the amount of oil spilled from the grease interceptor 1 is considerably large at the actual site, it is predicted that the result can be a dramatic result.

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without changing the gist of the invention. For example, in the above embodiment, the phase change temperature of the latent heat storage material filled in the PCM tank is not limited to 40 to 45 ° C., and it goes without saying that the phase change temperature can be appropriately changed by changing the composition of the PCM. No.

1 Grease interceptor 2 Oil and fat outflow prevention tank 2a Piping connection port 2b Discharge pipe 3 Oil and fat separation and recovery device 4 Piping 6 Plate-shaped PCM tank 11 Oil-containing wastewater storage tank 12 Trap pipe 13 PCM tank 13a Outer frame 13a'Concave surface 13b Cover Plate 13c PCM inlet 13d Water supply port 14 Water flow pipe 14a Header pipe 14b Water pipe 31 Schema-
32 Oil and fat separation and recovery unit 33 Return unit

Claims (10)

A grease interceptor that separates fats and oils from oil-containing wastewater.
An oil-impregnated wastewater storage tank that temporarily stores oil-impregnated wastewater that has flowed in from the upstream side,
A trap pipe that is connected to the downstream side of the oil-impregnated wastewater storage tank and discharges wastewater after the oil is separated.
It is provided with a PCM tank which is arranged on the outer periphery of the oil-impregnated wastewater storage tank and is filled with a latent heat storage material (PCM: Phase Change Material) composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank. ,
The grease interceptor is further provided with a water flow pipe arranged so as to be adjacent to the outside of the oil-impregnated wastewater storage tank in the internal space of the PCM tank. The oil-impregnated wastewater storage tank has a substantially rectangular parallelepiped shape with an open upper surface.
The PCM tank is arranged so as to surround at least the bottom surface and the long side surface of the oil-impregnated wastewater storage tank from the outside, and has an outer frame having a concave vertical cross section.
A concave surface formed so as to extend inward on both ends in the longitudinal direction of the outer frame, and
A cover plate attached to the upper side surface of the outer frame body to cover the slit-shaped opening formed between the upper edge of the outer frame body and the long side surface of the oil-impregnated wastewater storage tank is provided.
The grease interception according to claim 1, wherein the latent heat storage material of the PCM tank is filled in an internal space formed between the oil-impregnated wastewater storage tank, the outer frame body, and the concave surface. vessel. The cover plate has a substantially L-shaped vertical cross section.
The grease interceptor according to claim 2, wherein the cover plate is provided with a PCM injection port for injecting PCM on one end side of the upper surface thereof and a water supply port for water supply on the other end side. The water flow pipe is arranged in the internal space of the PCM tank.
A plurality of the water flow pipes are arranged side by side between a pair of header pipes having a concave shape in a side view and arranged so as to face each other and the pair of header pipes in a direction orthogonal to the header pipes. The grease interceptor according to claim 1, further comprising a water pipe. A grease interceptor that separates fats and oils from oil-containing wastewater.
An oil-impregnated wastewater storage tank that temporarily stores oil-impregnated wastewater that has flowed in from the upstream side,
A trap pipe that is connected to the downstream side of the oil-impregnated wastewater storage tank and discharges wastewater after the oil is separated.
A PCM tank installed in the oil-impregnated wastewater storage tank and filled with a latent heat storage material (PCM: Phase Change Material) composition capable of heat exchange with the oil-impregnated wastewater stored in the oil-impregnated wastewater storage tank is provided.
The PCM tank, PCM therein Ru is a plate-shaped PCM Sodea filling grease interceptor device, characterized in that. The grease interception according to any one of claims 1 to 5, wherein a latent heat storage material whose phase changes in the range of 40 to 45 ° C. is used as the latent heat storage material filled in the PCM tank. vessel. An oil / fat recovery system for recovering oil / fat from oil-containing wastewater.
The grease interceptor according to claim 1 and
An oil and fat outflow prevention tank that is connected to the downstream side of the trap pipe of the grease interceptor via a pipe and temporarily re-stores wastewater from the trap pipe.
An oil / fat recovery system comprising the grease interceptor and the oil / fat separation / recovery device for recovering floating oil from at least one of the oil-containing wastewater stored in the oil / fat outflow prevention tank. The oil and fat outflow prevention tank has a substantially rectangular parallelepiped shape with an open upper surface.
The oil and fat recovery system according to claim 7, wherein a pipe connection port for connecting to the pipe is formed on the upstream side surface, and a discharge pipe connected to the sewer pipe is arranged on the downstream side surface. .. The oil / fat separation / recovery device is
A schema for sucking oil-containing wastewater from the oil-impregnated wastewater storage tank provided in the grease interceptor or the oil-and-fat outflow prevention tank, and
The schema - storing the oil-containing wastewater sucked in, and oil separation collector arranged inside of those oil-water separation and recovery device,
The oil / fat recovery system according to claim 7 or 8, further comprising a return unit for discharging the wastewater from which the oil / fat has been separated in the oil / fat separation / recovery unit to the oil-containing wastewater storage tank or the oil / fat outflow prevention tank. A plate-shaped PCM tank that is arranged in an oil-impregnated wastewater storage tank provided in a grease interceptor that separates fats and oils from oil-impregnated wastewater, and is filled with a latent heat storage material (PCM: Phase Change Material).