KR101705494B1 - Method for separating oil using the device for separating oil from food waste with high recovery rate and high quality and method for washing the same - Google Patents

Abstract

The present invention relates to a method for separating oil by using a device that is capable of high-recovery rate and high-quality oil separation from food waste and a method for washing the same. To this end, the present invention provides a method for separating oil from food waste and a washing method including: (a) a step in which food waste is collected in a food waste collecting portion (100); (b) a step in which the collected food waste is transported to a crushing unit (200) and crushed; (c) a step in which the crushed food waste is allowed to flow into a three-phase separator (300) by a pump (P) and subjected to three-phase separation into oil, food waste leachate, and dry matter; (d) a step in which the oil flows into a filtering unit (400) after the separation by the three-phase separator (300) and is filtered by an inorganic membrane (410) of the filtering unit (400); and (e) a step in which the oil is collected in an oil storage tank (500) after the filtering by the filtering unit (400), in which (c1) a step in which the food waste leachate separated in the (c) step is transported to a microbubble generator (390) and microbubbles flow into the food waste leachate, the food waste leachate subjected to the inflow of the microbubbles is transported to a front end of the pump (P), and the food waste leachate is allowed to flow back into the three-phase separator (300) by the pump (P) is further included to follow the (c) step described above.

Description

TECHNICAL FIELD The present invention relates to a method for separating oil from a food waste, and more particularly, to a method for separating oil from a food waste,

The present invention relates to a method for separating oil using a device capable of separating oil from a food waste at a high recovery rate and a high quality, and a method for cleaning the device.

The amount of food waste in everyday garbage is gradually increasing, and it is known that about 20,000 tons per day in domestic. To prevent pollution of soil and groundwater, composting, feed conversion, and fueling using food waste have been introduced and recycled since 2005.

There are various processes for recycling food waste, but the process of producing the waste liquid through the crushing and dehydration process is common. There are oil, wastewater, and particulate matter (dry matter) in the desorbed liquid of food waste. Three-phase separators are also used to separate them.

Referring to FIG. 1, an apparatus adopting a three-phase separator as a food waste separation apparatus according to the prior art will be described.

The food garbage (including the desorbed liquid) that has passed through the dehydration process is collected in the food garbage collecting unit 100 and reaches the crushing unit 200 through the crushing unit 110.

The food waste that has been crushed in the crushing unit 200 reaches the three-phase separator 300 and is separated into three phases of oil, waste water, and building in order from the top by centrifugal force and specific gravity.

The upper portion of the oil is discharged through the oil discharge port 310 and collected in the oil storage tank 500. The oil collected in the oil storage tank 500 is biofuels and recycled as a main resource.

The negative wastewater in the middle portion is discharged through the wastewater discharge port 320, processed through a predetermined process, merged into a wastewater treatment facility, or transferred to a landfill for processing. However, as shown in FIG. 1, it may be re-introduced into the three-phase separator 300 to raise the recovery rate, which is the collection efficiency of the oil. At this time, air may be further injected from the air tank 380.

The solid building is discharged through the building exit port 330. The discharged building is fed or composted through feed conversion or composting process.

Such conventional techniques have the following problems.

First, oil separation efficiency is not good. That is, the recovery rate of the oil collection efficiency is low. Generally, the recovery rate of the oil in the food waste is about 2%, which means that there is still a certain amount of waste water in the oil layer separated through the three-phase separator 300, and a large amount of oil is also present in the waste water layer .

Second, the quality of the separated oil is not high. That is, it is clean. It is difficult to use the oil collected in the oil storage tank 500 as it is as a high-quality biofuel as it is often the case that the oil layer contains a building (for example, red pepper powder) or negative waste water.

Third, it is difficult to transfer the food waste in the oil separator. Food wastes have a wide variety of viscosities, and food wastes having a high viscosity are difficult to be transported to the crushing unit 200 and are difficult to be transported to the three-phase separator 300 even after they are crushed.

Conventional techniques for solving such problems exist.

Korean Patent No. 10-1142928 discloses a method in which oil separated from a three-phase separator is condensed using a vacuum evaporator or the like to produce an evaporating liquid, the remaining material is filtered through an oil filter, Is fed back to the decompression evaporator, thereby improving the quality of the oil and raising the recovery rate, which is the oil collection efficiency. However, this patent discloses that only the upper part oil separated from the three-phase oil separator is circulated, and therefore, the recovery rate, which is high oil collection efficiency, can not be secured in the low separation state of the three-phase oil separator. That is, the oil fraction remaining in the negative wastewater layer of the three-phase separator can not be recovered, and the recovery rate higher than the oil separation efficiency of the three-phase separator can not be ensured. In addition, since the filtration performance of the oil filter always causes contamination, it is doubtful to implement the device in view of securing stability, and there is still a problem that food waste having a high viscosity is difficult to be transported.

Korean Patent Laid-Open Publication No. 2001-0029631 discloses a food garbage separating apparatus using fine bubbles. In order to increase the oil separation efficiency, fine bubbles are supplied to the treatment tank. When this is applied to a three-phase separator, it is expected that the efficiency of separation of oil will increase due to the action of micro-bubbles. However, since the micro-bubbles are simply injected into the treatment tank itself, the degree of increase in separation efficiency is not satisfactory.

KR 10-1142928 B1 KR 2001-0029631A JP 2006-035147A KR 10-1282596B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems.

Specifically, in a food waste oil separation apparatus, a recovery method, which is an efficiency of collection of oil, is increased to provide a method of securing a greater amount of oil even when the same food waste is supplied to make biofuel.

Also, a method of separating oil which can be smoothly transferred and processed even if food wastes having various viscosities are supplied is proposed.

In addition, we propose a method for separating oil particles with high removal efficiency such that the quality of the separated oil is high, that is, the contaminants are minimized.

Also, a method of cleaning the filtration part is proposed to reduce the maintenance cost.

According to an aspect of the present invention, there is provided an apparatus for collecting food waste in a food waste collection unit. (b) the collected food waste is transferred to the crushing unit (200) and crushed; (c) the broken food waste is introduced into the three-phase separator (300) by the pump (P) to separate into three phases into oil, wastewater, and building; (d) the oil separated from the three-phase separator 300 flows into the filtration unit 400 and is filtered by the inorganic membrane 410 provided in the filtration unit 400; And (e) collecting the oil fraction filtered by the filtration unit 400 in the oil storage tank 500. After (c), (c1) the negative wastewater separated in (c) Bubble generator 390 so that the microbubbles are introduced into the three-phase separator 300 and the negative wastewater into which the microbubbles have been introduced is transferred to the front end of the pump P, The method further comprising the step of separating the food waste from the food waste. Here, the material of the inorganic film 410 may be ceramic, stainless steel (SUS), titanium, or the like.

The step (d) further comprises the steps of: (d1) separating the oil introduced into the filtration unit 400 into three phases by the inorganic film 410 into oil, waste water, and building, Forming a slurry on the bottom of the part (400); And (d2) the negative wastewater separated in the step (d1) is transferred to the micro-bubble generator 390 in the step (c1) so that micro bubbles are introduced and re-introduced into the three-phase separator 300 .

The step (d) further comprises the steps of: (d3) if the sensor S1 positioned at the rear end of the food waste collecting unit 100 senses the moisture content in the food waste and the value is less than a predetermined threshold, ) And the negative wastewater having the micro bubbles in the step (d2) is supplied to the front end of the crushing unit (200).

In the step (d), (d4) a part of the oil contained in the oil storage tank 500 is supplied to the micro bubble generator 490 to introduce the micro bubble; And (d5) flowing the oil into which the microbubbles have been introduced from the lower unfiltered waste water and the bottom interface between the building layer and the upper oil layer.

In addition, it is preferable that the step (c) further includes the step (c2) of heating the oil separated from the three-phase separator 300 and flowing into the filtration unit 400.

According to another aspect of the present invention, there is provided a cleaning method for use in a food waste separation method as described above, wherein the filtration unit is provided with a cleaning unit, The sensor S1 positioned at the rear end of the food waste collecting unit 100 senses the amount of food waste conveyed to the crushing unit 200 and the sensor S2 located at the rear end of the filtering unit 400 Sensing the amount of oil fraction filtered by the filtration unit 400 and calculating a recovery rate using the sensed values; And (f) cleaning the inorganic film (410) when the calculated recovery rate is less than a predetermined threshold.

The step (f) may include the step (f1) of stopping the operation of the filtration unit 400 during cleaning.

In the step (f), the operation of the three-phase separator 300 may be stopped or the oil separated from the three-phase separator 300 may be supplied to the oil separator 300 without passing through the filtration unit 400, And directly entering the storage tank 500.

In the step (f), (f3) a part of the oil collected in the oil storage tank 500 is supplied to the cleaning part 420, and the oil supplied to the cleaning part 420 is supplied to the inorganic film 410) is physically washed. Here, the physical cleaning may be oil backwash, air backwash, and the like.

In the step (f3), it is preferable that the oil supplied to the cleaning part 420 is heated by the heating part 600 to physically clean the inorganic film 410.

The oil separator further includes an air tank 900 for supplying air to the micro bubble generator 390. The step (f) includes the steps of: (f4) A part of which is supplied to the cleaning part 420 and the air supplied to the cleaning part 420 physically cleans the inorganic film 410 at a pressure higher than the filtration pressure.

According to the present invention, it is possible to provide a high-recovery and high-quality food waste separation method. Even if the same amount of food waste is supplied, a higher amount of oil can be recovered and biofuels can be obtained by the present invention. This is because the unfiltered wastewater can be separated over several times to increase the recovery rate and maximize the degree of oil separation by using the heating unit and micro bubble. Since the oil recovery rate is high, economical efficiency is greatly increased, and the amount of waste water discharged by the recovered amount is reduced, thereby being eco-friendly.

As a result of the Lab Scale experiment conducted by the present inventor, it was confirmed that the conventional oil recovery rate was about 2.0%, but the present invention was applied and reached about 2.4% which was about 20%.

Also, even if food waste having a high viscosity is supplied, it can be smoothly transferred to the three-phase separator according to the present invention, which increases the durability of the equipment and reduces the need for maintenance, which is economical.

In addition, by applying the inorganic film, it is possible to secure a high-quality oil with minimal contamination. By applying the inorganic membrane with a small pore size, fine particles such as red pepper powder which are not filtered by an oil filter or the like are filtered, and the heating part is applied, so that more waste water or building can be separated.

It is necessary to clean the inorganic membrane according to the membrane contamination. In addition to the easy cleaning according to the present invention, the operation of the three-phase separator can be continuously performed even during the cleaning, and the productivity is excellent.

1 is a schematic view of a food waste oil separation apparatus according to the prior art.
2 is a schematic view of a food waste separation apparatus to which the oil separation method and the cleaning method according to the present invention are applied.

Hereinafter, the term "inorganic film" means a membrane formed of an inorganic material such as ceramic, stainless steel, or titanium.

Hereinafter, the term "recovery rate" or "recovery rate of oil" means the collection efficiency of oil collected against the amount of food waste.

Hereinafter, the "lower boundary surface" means the interface between the upper oil layer and the lower wastewater and the building layer when the material is separated into oil and wastewater and buildings in the filtration section (see FIG. 2).

1.1 Food waste Oil  Description of separator

Hereinafter, a food waste separation apparatus to which the oil separation method and the cleaning method according to the present invention are applied will be described with reference to FIG.

The food waste oil separation apparatus includes a food waste collection unit (100) for collecting food waste, similar to the prior art food waste oil separation apparatus; A filtering unit 110 for primarily filtering collected food waste; A crushing unit 200 for crushing collected food waste; A three-phase separator 300 in which the food waste broken in the crushing unit 200 is introduced by the pump P and separated into three phases into oil, waste water, and building; And an oil storage tank 500 in which oil separated from the three-phase separator 300 is collected.

The three-phase separator 300 may be any device that separates the oil, the wastewater, and the building into three layers. For example, it can be separated by specific gravity and centrifugal force.

The three-phase separator 300 includes an oil discharge port 310 for discharging the separated oil, a waste water discharge port 320 for discharging the separated waste water, and a building discharge port 310 for discharging the separated building . From top to bottom, separated into oil, waste water and building, each outlet port is arranged in this order.

The negative wastewater in the middle portion is discharged through the wastewater discharge port 320. The microbubble generator 390 may be merged into a wastewater treatment facility through a predetermined process, or may be transferred to a landfill site to be processed. The building at the bottom is discharged through the building exhaust port 330 to be fed or composted.

The oil discharged from the oil discharge port 310 flows into the filtration unit 400. The oil fraction filtered by the filtration unit 400 flows into the oil storage tank 500. The filtration unit 400 preferably includes an inorganic film 410. The filtration unit 400 will be described in detail below.

The oil discharged from the oil discharge port 310 is transferred to the oil storage tank 500 without passing through the filtration unit 400 by the operation of the valve V2. Compared with the oil passing through the filtration unit 400, the quality of the transferred oil is relatively low. However, when the quality of the oil separated in the three-phase separator 300 is relatively high, for example, when the filtration unit 400 is being cleaned or the amount of contaminants in the food waste itself is relatively low as described later, have.

1.2 micro bubble  Description of generator 390

The oil separator according to the present invention includes a micro bubble generator 390 at the downstream end of the waste water discharge port 320. That is, air from the separate air tank 900 flows into the micro bubble generator 390 at the time when the negative wastewater discharged from the wastewater discharge port 320 is separated from the three-phase separator 300 and passes through the micro bubble generator 390, The incoming negative wastewater is formed and re-introduced into the three-phase separator 300.

In another embodiment, the negative wastewater into which the micro bubbles have been introduced may be mixed with the remaining wastewater filtered by the filtration unit 400. In this case, even the oil remaining in the filtered wastewater that has not been filtered by the filtration unit 400 can be separated again in the three-phase separator 300, thereby increasing the recovery rate.

The negative wastewater (including the wastewater from the filtration unit 400, if necessary) into which the microbubbles have been introduced is delivered to the oil separation apparatus according to the present invention in the following two ways. The selection of the two methods is based on the valve V1 located at the branch point branched from the rear end of the micro bubble generator 390 to the front end and the rear end of the crushing section 200.

First, the negative wastewater into which the micro bubbles have been introduced flows into the front end of the pump P and flows into the three-phase separator 300 together with the food wastes broken in the crushing unit 200.

Since it flows into the front end of the pump P, it can be naturally flowed into the three-phase separator 300 without a separate power device. In addition, microbubbles are introduced into the small-sized food wastes that have been crushed in the crusher 200, It is advantageous for the overall conveyance to the separator 300.

In addition, when the negative wastewater into which the micro bubble flows is introduced into the three-phase separator 300, the micro bubble rises and the oil contained in the negative wastewater layer is raised to increase the oil separation efficiency of the three-phase separator 300, Since the waste water is once again introduced into the three-phase separator 300 and separated, the recovery of the oil greatly increases. The experiment by the present inventors confirmed that the recovery rate of about 20% was increased.

Second, the wastewater to which microbubbles have been introduced may be introduced into the front end of the crushing unit 200.

This can be applied to a case where the moisture content is low enough that the transportation of the food waste collected in the food waste collecting part 100 is extremely difficult. That is, the negative waste water into which the microbubbles have been introduced is mixed with the low-moisture-treated food waste before processing, thereby serving as a singer, thereby helping to transfer the food waste. In addition, the odor of the food waste can be reduced by the oxidizing effect of the micro bubble.

To this end, a sensor S1 for sensing the amount of food waste, water quality (i.e., water quality particles) and moisture content (i.e., water content) in the food waste is located at the rear end of the food waste collection unit 100. When the moisture content of the food waste sensed by the sensor S1 is less than a predetermined threshold value, the valve V1 is operated so that the negative wastewater into which the micro bubbles have been introduced is controlled to be transferred to the front end of the second crushing unit 200 .

1.3 The filtration unit 400  Explanation

The filtering unit 400 will be described in detail.

The filtration unit 400 of the oil separation apparatus according to the present invention includes an inorganic membrane 410. In FIG. 2, the inorganic film 410 is made of immersion, but it may be constituted by a pressing type or any other method.

The oil transferred from the three-phase separator 300 contains a part of the waste water and the building. The inorganic membrane (410) filters the same and separates the oil, the waste water, and the slurry layer containing the building into three phases. Of course, unlike the separation in the three-phase separator 300, the overall ratio of oil layers is about 70-95%, which is the highest. In addition, a part of the building including the oil transferred to the filtration unit 400 is caught by the inorganic film 410, but a building having a relatively large particle forms a slurry and is gravitationally settled on the floor.

The negative wastewater in the middle portion flows into the micro bubble generator 390 as described above. The building at the bottom (i.e., slurry) is combined with the separated building in the three-phase separator 300 to be feed or fertilized.

Meanwhile, the oil flowing into the filtration unit 400 can be heated by the heating unit 600. The solid-liquid separation performance is increased when the waste water is heated, so that the filtration performance of the solid-liquid separation in the filtration unit 400 is further raised and the recovery rate of the oil is increased.

As in the case of Korean Patent No. 10-1142928, it is common to use an oil filter when filtering oil. However, an oil filter composed of an organic film such as a nonwoven fabric has many drawbacks in filtering food waste.

First, since there is no heat resistance, a heating unit for raising the separation efficiency can not be adopted.

Second, the corrosion resistance is small and frequent replacement is necessary. Food waste disposal liquids, which are low in pH and low in corrosion resistance, must be replaced frequently, which increases the maintenance cost significantly.

Third, the pore size of the oil filter is 80 to 250 탆, which is relatively large and not constant. The building of the food waste which can not be separated by the three-phase separator 300 contains many substances having a very small particle size, but is not filtered by the oil filter.

On the contrary, since the inorganic film 410 has a high heat resistance, the heated oil can be introduced through the separate heating part 600 to achieve high separation efficiency. Also, it shows a high lifetime due to the high corrosion resistance and high influx of food wastes having a high pH, since they have little influence on the membrane. Also, it is possible to filter the buildings of most food wastes with a relatively small and constant pore size of 0.1 to 0.4 탆 (90% or more average pore size).

Meanwhile, a micro bubble generator 490 may be further provided to introduce micro bubbles into the lower boundary surface of the filtration unit 400. The filtered wastewater and the building, which are unfiltered substances in the filtration unit 400, are settled at the lower end of the filtration unit 400, which is the bottom interface between the filtrate oil layer and the unfiltered waste wastewater and the building layer. By supplying microbubbles to the bottom surface of the filtration unit 400, oil can be more efficiently recovered to efficiently separate the oil to be treated including the waste water and the separation efficiency of the inorganic film 410 can be increased, The oil can be separated.

The oil stored in the oil storage tank 500 is flowed into the micro bubble generator 490 by operating the valves V3 and V4. At this time, air is introduced from the air tank 900, thereby generating oil into which microbubbles are introduced. The microbubble-inflowed oil is supplied from the lower interface of the filtration unit 400 and floats, thereby further separating the oil contained in the slurry or the negative wastewater layer deposited around the lower boundary surface. As a result, the recovery rate is increased.

The air tank 900 used here can be used in common with the air tank 900 that supplies air to the micro bubble generator 390, thereby further reducing the initial facility investment cost and the maintenance cost.

1.4 The cleaning unit 420  Explanation

The oil separator according to the present invention adopts the inorganic membrane 410 so that it can be used semi-permanently. As the filtration process proceeds, the cleaning agent 420 is cleaned.

The sensor S1 provided at the rear end of the food waste collecting unit 100 can sense the amount of the food waste to be transported as well as the moisture content of the food waste as described above. Separately, a sensor S2 for sensing the amount of oil separated is located at the rear end of the filtration unit 400. [ The recovery rate of the oil fraction is calculated by using the amount of food waste sensed by the sensors S1 and S2 and the amount of oil fraction. On the other hand, the sensor S2 may also sense the total amount of the oil and the water quality.

Therefore, when the calculated oil recovery rate is less than the predetermined threshold value, the cleaning section 420 operates to clean the inorganic film 410. [

The cleaning section 420 can perform both physical cleaning and chemical cleaning, but mainly performs physical cleaning.

Physical cleaning may include oil backwash using oil, or air backwash.

When the oil is used, the oil in the oil storage tank 500 flows into the cleaner 420 by operating the valves V3 and V4. The inflowing oil physically cleans the inorganic film 410 to a pressure higher than the filtration pressure. As described above, the physical cleaning may be backwashing, including oil backwash or air backwash. The oil can be heated by the heating unit 600 and supplied to the filtration unit 400, thereby increasing the cleaning efficiency. The heating unit 600 can be used in common with the heating unit 600 that heats the oil separated in the three-phase separator 300, thereby further reducing the initial facility investment cost and the maintenance cost.

When the air is used, the air contained in the air tank 900 may physically clean the inorganic film 410 at a pressure higher than the filtration pressure through the cleaning part 420. At this time, the air tank 900 can be used in common with the air tank 900 that supplies air to the micro bubble generators 390 and 490, thereby further reducing the initial facility investment cost and the maintenance cost.

The chemicals and water contained in the chemical storage tank (not shown) are introduced into the filtration unit 400 through the cleaning unit 420 for chemical cleaning.

On the other hand, during the cleaning operation, the filtration operation of the filtration unit 400 should be stopped. For this purpose, the operation of the three-phase separator 300 must also be stopped. However, if the continuous operation of the three-phase separator 300 is required in some cases, the valve V2 may be operated as described above, So that the separated oil can flow into the storage tank 500.

2.1 Food waste Oil  Description of operation of separator

The food waste collected in the food waste collecting unit 100 is crushed in the crushing unit 200 through the crushing unit 110. In this process, when the sensor S1 senses that the moisture content of the food waste is low, the separated wastewater from the three-phase separator 300 to the filtration unit 400 is introduced and smoothly transported.

The food waste broken in the crushing unit 200 is conveyed to the three-phase separator 300 by the pump P. The negative wastewater separated from the three-phase separator 300 to the filtration unit 400 may be introduced together with the micro bubbles and supplied to the three-phase separator 300 together. This increases the recovery rate.

The three-phase separator 300 separates the food waste into oil, waste water, and building.

The wastewater is discharged through the wastewater discharge port 320. The wastewater is discharged from the wastewater discharge port 320 to the wastewater treatment facility through a predetermined treatment or is transferred to a landfill for treatment. Generator 390 and re-introduced into the three-phase separator 300. The three-

The building is discharged through the building exit port (330) and fed or fertilized.

The oil is discharged through the oil discharge port 310 and is transported to the filtration unit 400 or when the particulate pollutant of the food waste itself is small or when the filtration unit 400 is being cleaned, Lt; / RTI >

The oil transferred to the filtration unit 400 is heated to a predetermined temperature by the heating unit 600 and is transported thereby improving the separation efficiency of the filtration unit 400.

The inorganic wastewater and the building are separated again from the incoming oil by the inorganic film 410 contained in the filtration unit 400. The building is settled to form slurry.

The filtered oil is stored in the oil storage tank 500 as high-quality oil with little particulate matter.

The separated negative wastewater is transferred to the micro bubble generator 390 together with the negative wastewater separated in the three-phase separator 300, and then flows into the three-phase separator 300 to increase the recovery rate.

The building is fed or fertilized together with the building discharged from the three-phase separator (300).

On the other hand, a part of the oil stored in the oil storage tank 500 flows into the micro bubble generator 490 and flows around the lower boundary surface of the filtration unit 400 together with the micro bubble. As the inflow of microbubbles rises, more wastewater or oil in the building is separated to increase the recovery rate.

2.2 The filtration unit 400  Description of cleaning method

When the recovery rate calculated using the amount of food waste sensed by the sensor S1 and the amount of oil sensed by the sensor S2 is less than a predetermined threshold value, the cleaning part 420 operates to clean the filtration part 400 .

For cleaning, the operation of the filtration unit 400 is stopped first. The operation of the three-phase separator 300 may also be stopped, and in some cases, the three-phase separator 300 may be operated continuously, and the separated oil may be stored in the oil storage tank 500 directly.

Both physical cleaning and chemical cleaning are possible.

Physical cleaning can be oil backwash using oil, or air backwash.

A part of the oil stored in the oil storage tank 500 is supplied to the filtration part 400 through the cleaning part 420 by the operation of the valves V3 and V4 to remove the inorganic film 410 Physically rinse at high pressure. And the oil is heated by the heating unit 600 at the time of supply, thereby improving the cleaning efficiency.

When air is used, high-pressure air higher than the filtration pressure is supplied from the air tank 900 to the filtration unit 400 to physically clean the inorganic film 410.

Separate chemicals are used for chemical cleaning. The chemicals and water contained in the separate chemical storage tank (not shown) are introduced into the filtration unit 400 through the cleaning unit 420 to perform the chemical cleaning.

While the present invention has been described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It will be appreciated that embodiments are possible. Accordingly, the scope of protection of the present invention should be determined by the claims.

100: Food waste collection section
110:
200: crushing part
300: Three phase separator
310: Oil discharge port
320: Waste water discharge port
330: Building exit port
380: air tank
390: micro bubble generator
400:
410: inorganic film
420: Three governments
490: Micro bubble generator
500: Oil storage tank
600: heating section
900: air tank
S1, S2: Sensor
V1, V2, V3, V4: Valve
P: Pump

Claims (11)

(a) collecting food waste in the food waste collection unit 100;
(b) the collected food waste is transferred to the crushing unit (200) and crushed;
(c) the broken food waste is introduced into the three-phase separator (300) by the pump (P) to separate into three phases into oil, wastewater, and building;
(d) the oil separated from the three-phase separator 300 flows into the filtration unit 400 and is filtered by the inorganic membrane 410 provided in the filtration unit 400; And
(e) collecting the oil fraction filtered by the filtration unit (400) in the oil storage tank (500)
The step (d)
(d1) The oil introduced into the filtration unit 400 is separated into three phases by the inorganic membrane 410 into oil, wastewater and building, and a part of the building separates slurry into the bottom of the filtration unit 400 ; And
(d2) the negative wastewater separated in the step (d1) is transferred to the micro-bubble generator 390 in the step (c1), and micro bubbles are introduced and re-introduced into the three-phase separator 300 ,
After the step (c)
(c1) the negative wastewater separated in the step (c) is transferred to the micro bubble generator 390 so that micro bubbles are introduced, and the negative wastewater into which the micro bubbles have been introduced is transferred to the front end of the pump P, Further comprising the step of re-entering said three-phase separator (300) by a pump (P)
Food waste separation method.
delete The method according to claim 1,
The step (d)
(d3) If the sensor S1 located at the rear end of the food garbage collecting unit 100 senses the moisture content in the food garbage and the value is less than a predetermined threshold value, the steps (c1) and (d2) Further comprising the step of supplying the microbubble-infused wastewater to the front end of the crushing unit (200)
Food waste separation method.
The method according to claim 1,
The step (d)
(d4) a part of the oil contained in the oil storage tank 500 is supplied to the micro bubble generator 490 to introduce the micro bubble; And
(d5) entering the microbubble-infused oil from the unfiltered waste water at the bottom of the filtration unit (400) and the lower interface between the building layer and the upper oil fraction.
Food waste separation method.
The method according to claim 1,
After the step (c)
(c2) heating the oil separated by the heating unit (600) from the three-phase separator (300) and flowing into the filtration unit (400)
Food waste separation method.
A cleaning method for use in a food waste oil separation method according to claim 1,
The filtration part 400 is provided with a cleaning part 420,
(S1) positioned at the rear end of the food waste collecting unit (100) senses the amount of food waste conveyed to the crushing unit (200), and the sensor (S1) located at the rear end of the filtering unit (S2) senses the amount of oil fraction filtered in the filtration unit (400) and calculates a recovery rate using the sensed values; And
(f) cleaning the inorganic film (410) by the cleaning part (420) when the calculated recovery rate is less than a predetermined threshold value.
Cleaning method.
The method according to claim 6,
The step (f)
(f1) stopping the operation of the filtration unit (400) upon cleaning.
Cleaning method.
The method according to claim 6,
The step (f)
the operation of the three-phase separator 300 is stopped or the oil separated in the three-phase separator 300 flows directly into the oil storage tank 500 without passing through the filtration unit 400 during the cleaning (f2) / RTI >
Cleaning method.
The method according to claim 6,
The step (f)
(f3) A part of the oil collected in the oil storage tank 500 is supplied to the cleaning part 420, and the oil supplied to the cleaning part 420 physically cleans the inorganic film 410 doing,
Cleaning method.
10. The method of claim 9,
In the step (f3), the oil supplied to the cleaning part (420) is heated by the heating part (600) to physically clean the inorganic film (410)
Cleaning method.
The method according to claim 6,
Further comprising an air tank (900) for supplying air to the micro bubble generator (390)
The step (f)
(f4) A part of the air contained in the air tank 900 is supplied to the cleaning part 420, and the air supplied to the cleaning part 420 is heated to a high pressure higher than the filtration pressure, ≪ / RTI >
Cleaning method.

Images