JP2010201321A - Method of recovering oil-and-fat in sewage in grease trap, and apparatus for solidifying the oil-and-fat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the recovery of oil-and-fat in a grease trap by using a relatively low cost apparatus. <P>SOLUTION: Cold air generated in a cold air generator 1 is introduced into the grease trap through a duct 9. Oil-and-fat in the vicinity of the water surface are cooled and solidified to be recovered, and oil-and-fat and SS (suspended particulate matter) in a region in close vicinity to the oil-and-fat in the vicinity of the water surface accompany them to be recovered at the same time, whereby clogging of a drain pipe and a sewer pipe and generation of trouble in a sewage treatment plant etc. can be inhibited. The cold air generator is constituted by a principle the same as an air conditioner and can be obtained relatively inexpensively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for recovering oil and fat in sewage water in a grease trap, and an oil and fat solidifying device used when performing this recovery method.

In general, in business establishments equipped with kitchen facilities, a large amount of oil and fat is contained in the waste water discharged from the kitchen. For this reason, if this drainage containing fats and oils is allowed to flow into the drainage pipe as it is, the grease trap may decay, the drainage pipe may be clogged immediately after draining from the grease trap, or the downstream sewer pipe That is, there is a problem that it is easy to cause. In addition, in sewage treatment plants and the like, it can be seen that trouble occurs particularly in the treatment of highly viscous oils and fats contained in sewage.

  In order to prevent this, it is obliged by the Ordinance of the Ministry of Land, Infrastructure, Transport and Tourism to install a grease trap in the middle of the drainage channel from the kitchen. Here, the grease trap is designed to separate the two by utilizing the specific gravity difference between the fat and oil in the sewage and the water, but in practice, the two are hardly separated in the grease trap. .

  In other words, in kitchens, various miscellaneous wastewater is often drained at a fairly high temperature, so the temperature in the grease trap is also kept relatively high, and the oil and fat is dissolved in water in the grease trap. Is the actual situation. For this reason, it is difficult to achieve the original purpose only by providing the grease trap, and various methods have been conventionally considered for recovering the oil and fat content in the sewage in the grease trap.

  For example, all the sewage in the grease trap is sucked up by a vacuum car and treated as industrial waste, or all the sewage in the grease trap is pumped up into a tank and filtered to return only purified water to the grease trap. Each business office employs such methods as providing such facilities, introducing biological agents into a grease trap, introducing a microbial agent into the grease trap, and introducing an emulsifier into the grease trap.

Hokos Co., Ltd. Product Catalog “Automatic Grease Recovery Machine Pukka Puca + Seiryu Trap”

  If the above-described solution using a vacuum car is used, it is easy to remove the oil and fat content in the grease trap and achieve the intended purpose, but the wastewater disposal process at each time is considerably expensive. It takes a lot of cost in a year.

  In addition, none of the other solutions are as effective as expected for the cost. For this reason, the fact is that many offices are struggling to collect the oil and fat in the sewage in the grease trap.

  In view of such a point, the present invention avoids the occurrence of the above-described various troubles caused by oil and fat, and does not pay so much cost, in the wastewater in the grease trap within a substantially necessary and sufficient range. While providing the method of collect | recovering fats and oils, the fat and oil solidification apparatus used for implementation of this collection | recovery method is provided.

  The method for recovering fats and oils in the sewage water in the grease trap according to the present invention cools and solidifies the fats and oils near the water surface by introducing cold air into the space area from the lid of the grease trap to the water surface. The oil and fat content is recovered by separating the water and the water.

  An oil and fat solidifying device according to the present invention includes a cold air generator, a cold air supply duct, and a cooling lid, and one end of the duct supplies the cold air of the cold air generator. And the other end is attached to the inlet of the cooling lid, and the cooling lid is configured to cover an upper portion of the grease trap.

  The apparatus of the present invention has a simple configuration at a relatively low cost, and is resource saving and energy saving. The apparatus of the present invention basically has a structure that does not cause fouling due to sewage, so that there are few failures and maintenance is easy.

FIG. 1 is an explanatory view showing a state in which the method for recovering fats and oils according to the present invention is carried out using the fat and oil solidifying apparatus according to the present invention. (Example 1) FIG. 2 is an explanatory view showing a state in which the method for recovering fats and oils according to the present invention is carried out using the fat and oil solidifying apparatus according to the present invention. (Example 2) FIG. 3 is an explanatory diagram showing a state in which the method for recovering fats and oils according to the present invention is carried out using the fat and oil solidifying apparatus according to the present invention. (Example 3)

  Oils and fats are collected using only a device that can be configured at a relatively low cost, such as a combination of a cool air generating device configured according to the same principle as an air conditioner, a duct, and a cooling lid.

  As described above, in the grease trap, almost all of the fats and oils are dissolved in the sewage and not separated, but the inventor of the present application is particularly viscous among the fats and oils. The fact that highly solidified fats and oils stay in the vicinity of the water surface in the grease trap, and the fats and oils having a viscosity equivalent thereto are dissolved and suspended in water close to the high-viscosity fats and oils. The main cause of the clogging of the drain pipe is the fact that the high-viscosity oil and fat and the dissolved oil and fat are cooled and solidified while flowing through the drain pipe downstream from the grease trap. The low-viscosity fats and oils contained in the sewage have been found to have almost no hindrance to treatment at a sewage treatment plant or the like.

  That is, in order to prevent the drain pipe from being clogged, it is possible to collect the highly viscous oil and fat remaining in the vicinity of the surface of the sewage in the grease trap and the oil and fat that is dissolved and floating in the vicinity of the oil and fat. If it is substantially necessary and sufficient and this recovery is performed, it is possible to avoid the occurrence of troubles at the sewage treatment plant or the like due to the high-viscosity oil and fat at the same time.

  From this point of view, the present invention realizes the collection of each oil and fat in the grease trap within the grease trap, and in particular, in order to realize the oil and fat in the grease trap without incurring a large cost. Adopt an original method that has never been tried to forcibly cool and solidify. First, a first embodiment of the present invention will be described below with reference to FIG.

  In this figure, reference numeral 19 denotes a grease trap (cross-sectional view), and a combination of the cool air generator 1, the duct 9 and the cooling lid 11 constitutes an oil and fat solidifying device. In this figure, the duct, the cooling lid and the grease trap are shown in a cross-sectional view for easy understanding of the structure.

  The cool air generating device 1 is configured according to the same principle as a general air conditioner, and the outer surface thereof has an intake port 2 for taking air into the evaporator 100 in the cool air generating device, and the cooled air from the evaporator 100. A supply port 3 for supplying to the outside, an intake port 4 for taking in air to be supplied to the condenser 105 in the cold air generator, a heat exhaust port 5 for discharging hot air from the condenser 105, an operation switch panel 6, a caster 7 and 8 is provided.

  The internal operation of the cold air generator will be briefly described. In this figure, the refrigerant flows as indicated by solid arrows, and the refrigerant compressed by the compressor 104 is cooled by the condenser 105 and liquefied, and then is expanded by the expansion valve 103. It is gasified, rapidly cooled, and supplied to the evaporator 100. Here, heat is exchanged with air from the intake port 2, and cooled air is supplied to the outside from the supply port 3.

  The refrigerant output from the evaporator is supplied again to the compressor and repeats the same loop. In the illustrated cool air generator, 102 is a blower fan, 106 is a fan, 101 and 107 are motors, 109 is a switch circuit board, 108 is a controller, and 112 is a heat insulating partition. Moreover, the dotted line in a figure shows the control signal from a controller.

  The cool air discharged from the supply port of the cool air generator 1 is supplied into the grease trap from the inlet 12 of the cooling lid 11 via the duct 9. In this embodiment, the cooling lid 11 is configured to have the same size as the grease trap lid, and only when the oil and fat is solidified, instead of the original grease trap lid, as shown in FIG. Inset. Reference numeral 15 shown in the grease trap is a stopper that closes the tip of the drain pipe from the kitchen, so that when the cold air A is supplied from the inlet 12 into the grease trap, the air in the drain pipe is shown. Prevents backflow into the kitchen. Reference numerals 13 and 14 denote openings for allowing the air in the grease trap to escape to the outside as the cold air A flows in.

  In the above configuration, when the cold air generator is activated, the volume of the space area from the surface of the blocked sewage to the grease trap lid is usually not so large. Oils and fats staying near the water surface, that is, highly viscous oils and fats, start to solidify relatively quickly.

  On the other hand, fine dust that was not trapped by the strainer in the grease trap usually drifts on the water surface in the grease trap, but when the oil and fat near the water surface is cooled and solidified, the solidified oil and fat is , Emerges on the surface of the water and begins to adhere to the garbage on the surface.

  Then, after solidification and adhesion of the highly viscous oil and fat in the vicinity of the water surface has sufficiently progressed, the cooling lid is removed from the grease trap, and the adhered oil and fat is removed with a wire mesh or a scraper. In addition, with the progress of solidification and cohesion of the above-mentioned highly viscous oil and fat, that is, with the progress of lowering the water temperature of the upper layer of the sewage in which the highly viscous oil and fat are present, cooling of the middle layer adjacent thereto begins, In this case, the phenomenon of oil / water separation and fat / oil floatation also occurs. And SS (floating particulate matter) are also collected along with the highly viscous oil and fat.

  As described above, in this embodiment, the highly viscous oils and fats and SS (floating particulate matter) having a viscosity corresponding to the highly viscous oils and fats that are easily clogged in the drain pipe are also collected. Even if the remaining sewage after these oils and fats are collected flows from the grease trap to the downstream drainage pipe, the possibility of clogging as in the conventional case becomes extremely low. Also, the operation of collecting the oil and fat is extremely simple because it only collects the oil and fat that has solidified and adhered to the water surface.

  The cold air generator is about the size of a small air conditioner and can be configured at a relatively low cost. In winter, when the temperature is sufficiently low, the oil and fat can be solidified by simply stopping the air cooling operation of the cold air generator and operating the cold air generator in the air blowing mode.

  The operation mode is switched by operating the switch on the panel 6, but instead, a sensor for measuring the temperature of the air sucked into the intake port 2 is provided in the cool air generator, and the measurement output of this sensor is below a predetermined temperature. In such a case, the controller 108 may automatically switch the operation mode.

  In general, high temperatures continue in summer, but the cool air generator used in the present embodiment has a capability of solidifying oil and fat even in such a state. By the way, it is possible to cool and solidify the oil and fat in the summer, even if using a cool air generating device that is not so high in performance. The second and third embodiments of the present invention configured to realize this will be described below.

  FIG. 2 shows the configuration of the second embodiment, and two cold air generators 23 and 30 are used. As shown in the drawing, the cool air discharged from the supply port 25 of the cool air generating device 23 is supplied to the intake port 17 of the cool air generating device 30 through the duct 29. The supplied cold air is further cooled in the cold air generator 30 and then supplied from the supply port 16 into the grease trap 19 through the duct 22.

  In this way, by arranging the two cold air generating devices in cascade, for example, if the two cold air generating devices have the same performance, approximately twice the performance can be realized. Oils and fats can be cooled and solidified.

  The third embodiment can cool and solidify the oil and fat at high temperatures even by using only one cool air generating device that is not so high in performance. FIG. 3 is a diagram for explaining such an embodiment. A cooling lid 43 attached to the upper portion of the grease trap 19 is provided in the grease trap in addition to the inlet 38 for receiving the cold air from the cold air generator 30. A discharge port 39 for returning the air to the intake port 31 of the cold air generator 30 is also provided.

  Then, the cool air discharged from the cool air generating device 30 returns to the intake port 31 of the cool air generating device through the duct 36, the grease trap 19, and the duct 37. By constructing such a positive feedback loop, the temperature in the grease trap can be accelerated and the intended purpose can be quickly achieved even if the performance of the cool air generator is not so high.

  In this embodiment, it is necessary to save the operation of the cold air generator from the viewpoint of protection of the cold air generator, and control is performed so that the temperature in the grease trap falls within the range of 10 ° C to 5 ° C. ing. For this purpose, the cool air generating device 30 includes a sensor that detects the temperature of the air sucked into the air inlet 31, and the controller in the cool air generating device pauses the cooling operation when the detected temperature of the sensor reaches 5 ° C. And switch to the blower mode. After that, when the detected air temperature returns to 10 ° C., it is set to switch to the cooling operation mode again.

  In general, since the air gap area in the grease trap is filled with contaminated air containing a transpiration component from the sewage, in consideration of this point, when carrying out this embodiment, first, the duct The tip of 36 is attached to the inlet 38 of the cooling lid 43 and the discharge port 39 of the cooling lid 43 is left open.

  Then, the cold air supply operation is started in this state, and the contaminated air in the grease trap is released from the discharge port 39 for a while. When the discharge of the polluted air is finished and the cold air starts to be discharged from the discharge port 39, the tip of the reflux duct 37 is attached to the discharge port 39 to recirculate the cold air.

  As described above, the contaminated air in the grease trap is prevented from being adversely affected by being supplied into the cold air generator. Further, an air purification filter 40 is mounted inside the tip portion 41 of the reflux duct 37. The filter 40 is sandwiched between a front end portion 41 of the duct and a front end ring 42 fitted into the front end portion 41. When the dirt becomes severe, the filter 40 is replaced with a new filter.

  As described above, as is apparent from the description of each embodiment, in view of the fact that the grease trap that has been widely provided so far has not achieved its original purpose, the oil and fat content is not contained in the grease trap. The original purpose of the grease trap is achieved by an unprecedented original idea of forced cooling and solidification.

  As a result, the apparatus of the present invention is much simpler and less expensive than the conventional large-scale structure in which the sewage in the grease trap is sucked up and taken into an external treatment apparatus and the sewage treatment is performed therein. Since it is constituted by cost means and does not take in and treat sewage in the apparatus, basically, the possibility that the apparatus is soiled or breaks down is extremely low and the service life is long. Also, maintenance can be done by cleaning or replacing the dirty filter, which is extremely easy. As can be seen from the above, the apparatus of the present invention is far more resource-saving and energy-saving than the prior art.

  Note that the present invention is not limited to the three embodiments described so far, and various structural modifications are naturally possible. For example, in each embodiment, a cooling lid having the same size as the original lid of the grease trap is used, but instead, a sufficiently large size covering the entire upper portion of the grease trap is used. Things may be used.

  On the contrary, when the inside of the grease trap is cooled, a gap is formed by slightly shifting the lid of the grease trap itself, and cold air may be supplied from this gap into the grease trap. In this case, an inflow port is formed on the cooling lid having a size that can cover the gap.

  Further, the cooling efficiency may be improved by adopting a structure in which the end of the cold air supply duct inserted into the inlet of the cooling lid reaches the water surface in the grease trap. Furthermore, in winter when the temperature is sufficiently low, the use of the cooling lid is stopped, and a sufficiently flexible and soft duct is used as the cold air supply duct, and this duct is manually operated to scan near the sewage surface. You may make it do.

  Furthermore, in the case of a particularly large grease trap, a plurality of cold air generators are prepared according to the size of the grease trap, and a plurality of cold air inlets are formed in the cooling lid, Alternatively, cooling may be performed by connecting ducts from each cold air generator.

  In addition, in Example 3, the temperature in the grease trap is controlled to be in the range of 5 ° C. to 10 ° C., but it is not necessary to limit to this temperature range, and the design may be changed appropriately. Furthermore, it is good also as a structure which omits the air purification filter with which the front-end | tip part of the recirculation | reflux duct was mounted | worn, and the filter provided inside the inlet 31 of the cold air generating device 30 serves as the role.

  As described above, various modified examples of the embodiment have been described. However, the present invention is not limited thereto, and an engineer can arbitrarily change the design within the scope of the technical idea of the present invention. It is also obvious to belong.

  By using a relatively low-cost cold air generator that is based on the same principle as an air conditioner, it is possible to recover substances that cause clogging of drain pipes and sewage pipes, and to reduce the occurrence of troubles in sewage treatment plants.

1, 23, 30 Cold air generator 2, 4, 17, 24, 31, 33 Air inlet 3, 16, 25, 32 Supply port 5, 20, 27, 34 Heat exhaust port 6, 28, 35 Operation switch panel 7, 8 Casters 9, 22, 36 Duct 11, 43 Cooling lid 15 Stopper 19 Grease trap 40, 110, 111 Filter 100 Evaporator 101, 107 Motor 102 Blower fan 103 Expander 104 Compressor 105 Condenser 108 Controller 112 Thermal insulation partition

Claims (2)

By introducing cold air into the space region from the lid of the grease trap to the water surface, the fats and oils near the water surface are cooled and solidified, thereby separating the oils and fats and water, and collecting the fats and oils. A method for collecting oil and fat in the sewage in the grease trap. An apparatus for solidifying oil and fat in the vicinity of the water surface in a grease trap, comprising a cold air generating device, a cold air supply duct, and a cooling lid, wherein one end of the duct generates the cold air. The cooling device is attached to a supply port for supplying cool air, the other end is attached to the inlet of the cooling lid, and the cooling lid is configured to cover an upper portion of the grease trap. An oil and fat solidifying apparatus characterized by comprising:

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