JP2003088838A - Recycling system of food waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycling system by which food waste discharged from a food service industry, a food plant or the like is efficiently recycled as feed, fuel or the like. SOLUTION: One or more equipments of a deoiled dry feed manufacturing equipment A provided with at least a steam cleaning cooker and a hot steam dryer, a methane gas and biomass manufacturing equipment B provided with at least a heat dissolving tank, a methane fermenter and an algae culturing apparatus and a fermented mixed feed manufacturing equipment C provided with at least a mixer type fermenting apparatus and a gaseous nitrogen generator are provided. In the manufacturing equipment A, the food waste is steam cleaned and dried to manufacture a deoiled dry feed, in the manufacturing equipment B, the food waste is methane-fermented to obtain a high calory gas and manufacturing biomass by utilizing the digested liquid and the gas and in the manufacturing equipment C, the food waste is mixed with other materials to be lactic-fermented to manufacture the fermented mixed feed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for recycling food waste as high value-added livestock feed, fuel and the like.

[0002]

2. Description of the Related Art Food waste (food residues) generated from restaurants, hotels, other food service industries, and food factories such as tofu, noodles, and alcohol is originally valuable as livestock feed and is valuable. There was a time when they were traded.

However, since food waste has a large amount of water and produces an offensive odor, its use has been shunned, and most of the food waste is now incinerated as municipal waste. However, the incineration process is not a preferable process because it not only generates a large amount of carbon dioxide gas that causes global warming but also may generate toxic dioxin and the like.

On the other hand, the so-called recycling law was enacted about ten years ago, and it has become an important issue to try to recycle food waste. Direct drying methods, oil temperature dehydration methods, and the like have been conventionally known as methods for recycling food waste as animal feed. The former direct drying method is a method in which food waste is put into a cooker, steamed, and dried in a drier to be used as feed, and the latter oil temperature dehydration method is used to put food waste and waste cooking oil into a cooker. This is a method in which the food waste is put in and heated, and the food waste is dehydrated by the heat of the waste edible oil, and then oil is crushed and crushed to obtain a feed.

Further, in a method for recycling food waste as an energy source such as fuel, the food waste is hydrolyzed by acid fermentation and then methane fermentation is performed to produce a fuel containing methane gas as a main component. The methane fermentation method is well known.

[0006]

However, in the above-mentioned direct drying method and oil temperature dehydration method, since it is difficult to separate the solid content and the oil content, it is difficult to obtain a feed having a low oil content, and thus it is possible to obtain the feed. The feed contains a large amount of oil such as 10 to 20% by weight. Compared to commercially available compounded feeds (crude fat about 4%), such feeds have an excess of 2.5 to 5 times the oil content, which results in poor nutritional composition and is not preferable as a livestock feed.

On the other hand, in the above-mentioned methane fermentation method, although methane gas can be obtained, it takes about one week to hydrolyze the food waste by acid fermentation before methane fermentation.
There is a problem that the pretreatment period becomes long. In addition, since the gas generated by methane fermentation contains carbon dioxide gas, etc., and the digestive liquid contains nitrogen and ammonia,
It is also effective to use these to produce new feed.

Further, it is also effective from the viewpoint of recycling that the food waste is fermented mixed feed by lactic acid fermentation with other raw materials.

The present invention has been made in view of the above circumstances, and its main object is to make food waste into a dry feed having a low oil content and a well-balanced nutritional composition. Along with shortening the pretreatment period of methane fermentation, it is possible to effectively utilize the carbon dioxide gas contained in the gas produced in methane fermentation and the nitrogen contained in the digestive liquid to produce a new feed by algae culture, and a fermentation mixed feed. It is intended to provide a food waste resource recycling system capable of efficiently carrying out the production of the product in only about one day.

[0010]

In order to achieve the above object, a food waste recycling system according to claim 1 of the present invention comprises a deoiled dry feed comprising at least a steam washing cooker and a heating steam dryer. Any of the production equipment A, a methane gas and biomass production equipment B having at least a heating dissolution tank, a methane fermentation tank, and an algae culture device, and a fermentation mixed feed production equipment C having at least a mixer-type fermentation device and a nitrogen gas generator. One or two or more facilities are provided, food waste from which foreign substances have been separated is supplied to the steam-washing cooker of the above-mentioned deoiled and dry feed production facility A, and heated to 90 ° C. or higher by steam to produce food waste. After the oil content is floated, hot water at 90 ° C or higher is sprayed on the food waste to perform a steam washing treatment to remove oil content and salt content, and the separated solid content is dried with a heating steam dryer. Production of oil-dried feed, methane gas and the above-mentioned heating and dissolution tank of biomass production facility B are solubilized by adding food waste in which foreign matter is difficult to separate and heating, and introducing the solution into the methane fermentation tank. To produce a gas containing methane gas as a main component and supply a part of the generated gas and a digestive liquid to an algae culture device to cultivate algae to produce biomass, the production of methane gas and biomass, Lactic acid in the atmosphere of nitrogen gas supplied from the nitrogen gas generator to the fermenter while adding and mixing food waste, other raw materials, lactic acid bacteria, and the like into the mixer-type fermenter of the fermented mixed feed production facility C. The present invention is characterized in that any one or two or more of the following: production of a fermented mixed feed, which is characterized by fermenting, is performed.

When the food waste from which foreign substances have been separated is steam-washed by the steam-washing cooker of the deoiled dry feed production facility A as in the recycling system of claim 1, 90 ° C. by steam is used.
Since the oil content floated by the above heating is efficiently washed away with warm water and removed, it is possible to produce a deoiled dry feed with a small oil content of about 5% and a well-balanced nutritional composition.

[0012] Since food wastes from which it is difficult to separate foreign substances cannot be processed in the deoiled dry feed production facility A, they are methane-fermented by the methane fermentation tank of the methane gas and biomass production facility B, and high calorie containing methane gas as a main component. Gas is generated. At that time, as a pretreatment, the food waste is put into a heating dissolution tank and heated to rapidly solubilize high molecular weight organic matter and convert it into a substrate that is easily subjected to methane fermentation treatment. Is completed, and the time required for the pretreatment can be significantly shortened as compared with the conventional hydrolysis by acid fermentation. Then, in order to cultivate the algae by supplying a part of the gas generated by the methane fermentation and the digestive liquid to the algae culture device, the algae ingest the carbon of carbon dioxide gas contained in the gas and the nitrogen contained in the digestive liquid. It proliferates actively and can produce efficient biomass.

Further, as in the recycling system of claim 1, food waste, other raw materials, lactic acid bacteria and the like are charged into a mixer type fermentation apparatus of the fermentation mixed feed production facility C and mixed in a nitrogen gas atmosphere. However, when fermented with lactic acid, only 1
It is possible to efficiently produce a fermented mixed feed that is moderately fermented on a daily basis.

Next, a food waste recycling system according to a second aspect of the present invention is the oil-free dry feed production facility A of the above-mentioned first aspect of the recycling system, wherein the oil and salt components removed by the steaming treatment are removed. It is characterized in that the broth containing the above ingredients is further subjected to solid-liquid separation by a horizontal centrifuge, and the separated liquid is separated into sap, oil and sludge by a three-phase separator.

By solid-liquid separation of the broth in this way, the solid content can be supplied to the heating steam dryer for reuse, the oil content separated by the three-phase separator can be used as fuel, and the sludge can be heated steam. It can be supplied to a dryer for reuse, and the sap component can be supplied to a methane fermentation tank of methane gas and biomass production facility B for methane fermentation or supplied to a heating steam dryer for reuse, thus eliminating waste.

Next, the food waste recycling system according to claim 3 is the deoiled dry feed production facility A according to claim 1.
In the above, the discharge steam discharged from the heating steam dryer is sequentially supplied to the cyclone and the scrubber to remove fine powder, and the heating steam generator again supplies the discharged steam to the heating steam dryer.

When the exhaust steam is circulated and used in this manner, energy loss can be minimized, which is economical, and the fine powder removed by the cyclone can be returned to the heating steam dryer for processing, which is wasteful. Disappears.

Next, in the food waste recycling system according to claim 4, the steam-washing cooker in the deoiled and dry feed production facility A of the recycling system according to claim 1 has innumerable openings. A rotary cylinder having, a steam pipe laid outside the rotary cylinder, and a hot water pipe laid inside the rotary cylinder, which is provided at one end of the rotary cylinder. While sending the food waste toward the other end by the rotation of the rotating cylinder, by injecting steam from the steam pipe to the rotating cylinder, the food waste is heated to 90 ° C. or higher to remove the oil content in the food waste. It floats and sprays hot water of 90 ℃ or higher on food waste from a hot water pipe to separate and remove broth containing oil and salt through the numerous openings in the rotating cylinder to the outside of the rotating cylinder. It is characterized by being.

Like steam cooker of this recycling system, when steam is sprayed from the steam pipe arranged outside the rotary cylinder to the rotary cylinder, the food waste is heated by the steam and the oil is floated. In addition, it is possible to prevent the opening of the rotary cylinder from being blocked by the injected steam. Then, the floating oil and salt are efficiently washed away by the hot water sprayed from the hot water pipe provided inside the rotary cylinder, and separated and removed to the outside from the numerous openings of the rotary cylinder.

Next, in the food waste recycling system according to claim 5, the steam-washing cooker in the deoiled dry feed production facility A of the recycling system according to claim 1 has a tank with a lid, At least a cage having a myriad of openings detachably attached to the inside of the tank, a steam pipe provided above the cage, and a hot water pipe provided inside the cage. By injecting steam from the steam pipe to the food waste supplied inside the cage, the food waste is heated to 90 ° C or higher to levitate the oil content in the food waste, and further to 90 ° C from the hot water pipe. By spraying the above-mentioned warm water onto food waste, the broth containing oil and salt is separated and removed through a myriad of openings in the cage.

The steam-washing cooker of this recycling system is
After opening the lid of the tank and putting a certain amount of food waste into the basket, close the lid and you can perform a batch-type steam cleaning process with steam sprayed from the steam pipe and hot water sprayed from the hot water pipe. However, the equipment cost can be reduced.

Next, in the food waste recycling system according to claim 6, the heating steam dryer in the deoiled dry feed production facility A of the recycling system according to claim 1 is a cylindrical rotary dryer. At least a furnace is provided, and the solid content supplied to one end of the rotary drying furnace is sent toward the other end by the rotation of the drying furnace, and heated steam is caused to flow from one end to the other end of the rotary drying furnace to obtain solid content. It is characterized in that heating steam is made to flow in parallel.

Heating of this recycling system When the solid content and the heating steam are made to flow in parallel as in the above-mentioned dryer, the high-temperature heating steam comes into contact with the solid content having a large amount of water in the initial stage of drying, and the amount of water in the final stage of drying is small. Since the heated steam having a lowered temperature comes into contact with the solid content, the burning of the solid matter due to the heated steam is significantly reduced. Further, since the solid content does not come into contact with air, it is possible to obtain a deoiled dry feed without fear of oxidation.

Next, in the food waste recycling system according to claim 7, in the methane gas and biomass production facility B of the recycling system according to claim 1, the algae cultivated by the algae culturing device is Euglena. It is characterized by

When Euglena (Euglena) is used as algae to be cultivated as in this recycling system, it exhibits high adaptability to carbon dioxide gas and can be cultivated at a high density, and the medium composition is appropriate. This is an extremely effective raw material for biomass production because it has the advantage of being able to constantly produce a large amount of biomass as a feed all year round and allowing culture in a closed system and reuse of the medium.

Next, the food waste recycling system according to claim 8 is the fermentation mixed feed production facility C according to claim 1.
In (1), the fermentation-mixed feed fermented with lactic acid by a mixer-type fermentation device is supplied to a bagging device equipped with a suction device, and packed while sucking.

When the fermented mixed feed is packed into the bag while sucking as in this recycling system, the lactic acid fermentation continues due to the action of the anaerobic lactic acid bacteria, so that the fermented mixed feed is aged.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a conceptual diagram showing the recycling system of food waste according to the present invention by type.

The food waste recycling system according to the present invention includes at least a deoiled and dried feed production facility A equipped with a steam washing cooker and a heating steam dryer, a heating dissolution tank, a methane fermentation tank, and an algae culture apparatus. Since any one or more of the methane gas and biomass production equipment B provided, the fermentation mixed feed production equipment C having at least a mixer-type fermentation device and a nitrogen gas generator are provided, FIG. It is divided into 7 types shown in (a) to (g).

That is, the recycling system shown in FIG. 1 (a) comprises a deoiled dry feed production facility A (hereinafter referred to as production facility A) and a methane gas and biomass production facility B (hereinafter referred to as production facility B). And the fermentation mixed feed production facility C (hereinafter referred to as the production facility C) are all provided, as shown in FIG.
The recycling system of FIG. 1 is provided with the production equipment A and the production equipment B, and the recycling system of FIG.
And the production equipment C are provided, and the recycling system of FIG. 1 (d) is provided with the production equipment B and the production equipment C. As shown in FIG. 1 (e), (f), (g) The recycling system is provided with a production facility A, a production facility B, and a production facility C, respectively.

FIG. 2 is an explanatory view of a concrete embodiment of the production facility A (deoiled and dried feed production facility), and as shown in the figure, a continuous steam washing cooker 1, a feedback mixer 2a, and heating steam. It is composed of a dryer 3, a heating steam generator 4, a combustion furnace 5, a deodorizing furnace 6, a cyclone 7, a scrubber 8, a concentrator 9, a horizontal centrifugal separator 10, a heating tank 11, a three-phase separator 12, and other main devices. ing.

According to the production facility A, first, the food waste M as a raw material is supplied to the continuous steam-washing cooker 1 to be steam-washed. As the raw material food waste M, food waste generated in restaurants, hotels, hospitals, school meals, restaurants, and other food service industries, etc., from which foreign substances have been separated by separate collection is used.

[0034]蒸洗process, the food waste M is levitated oil content was heated to 90 ° C. or higher by the steam V _a food waste inside the蒸洗cooker 1, then, 90 ° C. or more hot water W
Is sprayed onto the food waste M to efficiently remove floating oil and salt. This steam washing treatment has a much better deoiling efficiency than the conventional direct drying method or oil temperature dehydration method. Therefore, as will be described later, the oil content is as low as about 5% and the deoiled dry feed M having a good nutritional balance. It becomes possible to produce _g .

The specific structure and operation of the steam cleaning cooker 1 will be described later in detail.

The solid content M _s of the food waste from which almost all the oil has been removed by the steam washing treatment is sent from the discharge port of the steam washing cooker 1 to the feedback mixer 2a by the screw conveyor 15a so as not to be solidified into a dumpling. After adjusting the water content, the water is supplied to one end of the heating steam dryer 3. Also,
The heated steam V _b generated by the heated steam generator 4 is also supplied to one end of the heated steam dryer 3. And solid content M
_s is sent toward the other end of the heating steam dryer 3 and is heated and dried by the heating steam V _b flowing in the same direction toward the other end so that the water content becomes approximately 5% by weight or less, and deoiled. Dry feed M _g is produced.

When the solid content M _s and the heating steam V _b are co-flowed in the same direction in this way and dried, the high-temperature heating steam comes into contact with the high-moisture solid content at the initial stage of drying, and the solid content of low moisture at the final stage of drying. Since the heated steam having a lowered temperature comes into contact with the minute portion, the burning of the solid content is significantly reduced.
Further, since the solid content M _s does not come into contact with air inside the heating steam dryer, there is no fear of oxidation.

The specific structure and operation of the heating steam dryer 3 will be described later in detail.

The deoiled dry feed M _g discharged from the discharge port at the other end of the heating steam dryer 3 is fed to the screw conveyor 15b.
Is sent to the two-way screw conveyor 2b, and most of it is supplied from one end of the two-way screw conveyor 2b as a product to a shipping line or the like (not shown). Then, the remaining deoiled dry feed M _g is returned to the feedback mixer 2a from the other end of the bidirectional screw conveyor 2b and mixed with the solid content M _s supplied from the steam cleaning cooker 1 to adjust the water content as described above. Done.

As described above, the oil-free content of the deoiled dry feed M _g obtained by steam-washing the raw food waste M in the steam-washing cooker 1 and drying it in the heating steam dryer 3 is approximately 5%. %, The nutritional composition is well-balanced, and since it does not cause charring or oxidation during drying, it is a high-quality and highly valuable livestock feed.

On the other hand, the exhaust steam V _c discharged from the exhaust port at the other end of the heating steam dryer 3 is supplied to the cyclone 7 to remove fine powder, and further supplied to the scrubber 8 and cannot be removed by the cyclone. Fines are removed. The exhaust steam V _c from which the fine powder has been removed in this way is returned to the heating steam generator 4 and reheated, and most of it is supplied again to the heating steam dryer 3 as the heating steam V _b . Further, the exhaust steam V _d discharged from the steam cleaning cooker 1 is also supplied to the heating steam generator 4 and reheated, and most of it is supplied to the heating steam dryer 3 as the heating steam V _b . And
A part of the heating steam V _b (reheated exhaust steam V _c , V _d ) is supplied to the deodorizing furnace 6, and after deodorizing treatment, is passed through the heating steam generator 4 together with the combustion gas G, and finally the chimney. It is exhausted from 13 to the outside.

When the exhaust steam V _c from the heating steam dryer 3 is circulated and used or the exhaust steam V _d from the steam cleaning cooker 1 is reused as the heating steam for drying, energy loss is caused. It is economical because it can be minimized. Further, since the fine powder removed by the cyclone 7 as described above can be returned to the feedback mixer 2a for processing, waste is eliminated.

The specific structure and specific operation of the heating steam generator 4 and the deodorizing furnace 6 will be described later in detail.

The broth BL containing oil and salt separated by the steam-washing cooker 1 is supplied to the horizontal centrifuge 10 for solid-liquid separation, and the solid content S is screw conveyor 15
It is supplied to the feedback mixer 2a at c and 15a and is reused.

On the other hand, the liquid component L separated by the horizontal centrifuge 10 is temporarily stored in the heating tank 11 in order to accelerate the separation of the oil-containing component, and the liquid temperature thereof is maintained around 90 ° C. Then, this liquid component L is supplied to the three-phase separator 12 and the liquid component L
_The oil is separated into ₁ , oil O, and sludge S ₁ and stored in the respective tanks 14, 15 and 16.

The oil content O in the tank 15 is further supplied to the sedimentation tank 17, and after removing the sediment, it is supplied to the shipping line as fuel or the like. Also, the sludge S in the tank 16
₁ is supplied to the feedback mixer 2a by the screw conveyors 15c and 15a and reused. And
The juice component L _{1 in the} tank 14 is supplied to the production facility B (methane gas and biomass production facility) as a methane fermentation raw material via the switching valve 18 or is supplied to the concentrator 9 using the waste heat from the scrubber 8. The juice component L ₁ concentrated by the concentrator 9 is supplied to the feedback mixer 2a for reuse.

This production facility A is economical because there is no waste and nothing is discarded because all the broth BL containing oil, salt, etc. separated by steaming as described above is also processed. .

FIG. 3 is a perspective view of an essential part of the steam cleaning cooker 1 described above, FIG. 4 is a schematic vertical sectional view of the steam cleaning cooker, and FIG. 5 is a schematic horizontal sectional view of the steam cleaning cooker.

This steam-washing cooker 1 includes a closed case 1a,
Raw material supply device 1b, solid content discharge device 1d, rotating cylinder 1
e, a steam pipe 1p, a hot water pipe 1q, and other main components. At one end of the closed case 1a, a screw conveyor having a closed structure with a hopper as a raw material supply device 1b is attached to rotate the screw. By changing the number, the raw material food exhaust M can be continuously supplied while controlling the supply amount. Then, the discharge port 1c formed in the bottom surface of the other end of the sealed casing 1a is a screw conveyor of the sealed structure is attached as a discharge apparatus 1d of蒸洗treated solids M _s.

Inside the closed case 1a, a rotary cylinder 1e is rotatably supported by a plurality of receiving rollers 1f and a drive roller 1g so that the end of the cylinder on the raw material feeding side is slightly higher. It is installed in a tilted state. The rotary cylinder 1e has innumerable openings. Specifically, approximately half of the raw material supply side is formed of punching metal 1h and approximately half of the opposite side is formed of wire mesh 1i, and the whole is a reinforcing frame. It is reinforced with 1j. Ring bodies 1k and 1k are provided on the outer periphery near both ends of the rotary cylinder 1e, and these ring bodies 1k and 1k are mounted on the rollers 1f and 1g and rotatably supported by the rollers. . In addition, in the one ring body 1k, a portion that meshes with the drive roller 1g is a gear.

As shown in FIG. 4, on the inner surface of the rotary cylinder 1e on the raw material supply side, spiral feed blades 1m are provided at about 3 pitches, and further, from the feed blade 1m to the inner surface of the discharge side cylinder. Is formed with a plurality of scraping blades 1n having a mountain-shaped cross-sectional shape as shown in FIG. 5 at intervals in the circumferential direction. Therefore, when the rotating cylinder 1 rotates, the food waste M supplied to the end of the supply side of the cylinder has a feed blade 1 m.
Is sent toward the discharge side end of the cylindrical body 1, and is sent to the discharge side end of the cylindrical body 1 while being stirred by the scraping blade 1n from the middle. Since the rotating cylinder 1e is slightly inclined as described above, the food waste M can be smoothly sent to the end of the discharge side by the rotation of the cylinder 1e even after passing the feed blade 1m.

On the outside of the rotating cylinder 1e, the vapor V _a
A steam pipe 1p having a large number of injection ports for injecting the water into the rotating cylinder 1e is arranged in parallel with the rotating cylinder 1e, and hot water W is sprayed on the food waste M inside the rotating cylinder 1e. A hot water pipe 1q having a large number of spray ports is provided.
Both of the steam pipe 1p and the hot water pipe 1q are inserted into the case from the side surface on the discharge side of the sealed case 1a, and the tip of the steam pipe 1p extends close to the end of the rotary cylinder 1e on the raw material supply side. Further, the tip of the hot water pipe 1q extends to near the center of the rotary cylinder 1e.

Therefore, while rotating the rotating cylinder 1e to send the food waste M inside the cylinder from the end on the supply side to the end on the discharge side, steam and hot water are respectively supplied from the steam pipe 1p and the hot water pipe 1p. When sprayed and steam-washed, the food waste M is heated by the steam V _a sprayed from the steam pipe 1p to float oil in the initial stage, and then the hot water pipe 1q.
The floated oil and salt are efficiently washed away by the warm water W sprayed on the food waste M from the above, and are dripped onto the bottom surface of the closed case 1 from the numerous openings of the rotary cylinder 1e as boiling juice BL. Then, from the steam pipe 1p to the rotary cylinder 1
The vapor V _a injected into the cylinder also prevents clogging of the opening of the rotary cylinder 1e.

The steam V _a injected from the steam pipe 1p is 1.9 k of saturated steam at 120 ° C. or higher supplied from the boiler.
It is preferable to use a gas adjusted to a pressure of about g / cm ² , and to inject the steam V _a so that the product temperature of the food waste M becomes 90 ° C. or higher, preferably 90 to 95 ° C. by this steam injection. It is necessary to control the amount, the supply amount of the food waste M, and the feeding speed. When food waste is insufficient heating of M material temperature is below 90 ° C., since the oil flotation efficiency is lowered, to produce a good de-oiling dry feed M _g nutritional balance contains less oil Becomes difficult. Also,
The hot water W sprayed from the hot water pipe 1q must have a temperature of 90 ° C or higher (preferably, the same as or slightly higher than the product temperature of heated food waste), and the hot water having a temperature lower than 90 ° C is sprayed. Then, since the oil removal efficiency decreases, it becomes difficult to produce the deoiled dry feed M _g having a small nutritional balance and a good nutritional balance, as in the above case.

As shown in FIGS. 4 and 5, the bottom surface of the closed case 1a of the steam-washing cooker 1 inclines so as to decrease toward the central broth discharge port 1r, and the opening from the opening of the rotary cylinder 1e to the bottom surface. The dripping and flowing broth BL is collected in the broth discharge port 1r and supplied to the horizontal centrifuge 10 described above. Further, an exhaust port 1s is provided on the side surface of the closed case 1 on the raw material supply side, and as described above, the steam V _d (steam used for the steam cleaning process) discharged from the exhaust port 1s is heated. It is supplied to the steam generator 4 and reused as heating steam. Then, the solid content M _s from which the oil content, the salt content and the like have been removed by the steam washing process is dropped from the discharge side end of the rotary cylindrical body 1e to the screw conveyor 1d and sent out, and passes through the feedback mixer 2a as described above. It is supplied to the heating steam dryer 3.

FIG. 6 is an explanatory view of the heating steam dryer 3, the heating steam generator 4, the combustion furnace 5 and the deodorizing furnace 6 in the production facility A,
FIG. 7 is a schematic cross-sectional view of the heating steam dryer 3.

This heating steam dryer 3 is provided with a feeder section 3b for supplying the steam-treated solid content M _s and heating steam V _b at one end of a cylindrical rotary drying furnace 3a.
At the other end of a, a cover body 3e having an outlet 3c for dry feed M _g and an outlet 3d for heated steam is provided.

The rotary drying oven 3a has a plurality of receiving rollers 3f.
And a drying roller rotatably supported by a driving roller (not shown in the figure), and one end of the drying furnace provided with the feeder portion 3b is installed so as to be slightly higher than the other end. And, on the inner surface on one end side of the rotary drying furnace 3a,
Spiral feed blades 3g are provided for several pitches, and further, scraping blades 3h having a V-shaped cross-sectional shape as shown in FIG. 7 are circumferentially formed on the inner surface of the drying furnace on the other end side of the feed blades 3g. Many are installed at intervals.

Using the heating steam dryer 3 having such a structure, while rotating the rotary drying furnace 3a, the steam-treated solid content M _s and the heating steam V _b generated by the heating steam generator 4 are used.
Are supplied to the inside of the rotary drying furnace 3a from the solid content supply port 3i and the air inlet 3j of the feeder section 3b, respectively, the solid content M _s is sent toward the other end of the drying furnace 3a by the action of the feed blade 3g. While being scraped up by the scraping blade 1n from the middle as shown in FIG. 7, and stirred and crushed, it uniformly contacts the heated steam V _b flowing in the same direction as the solid content feeding direction for efficient drying and drying. is discharged from the drying furnace and the other end of the discharge port 3c become feed M _g.

When the heated steam V _b is caused to flow backward in the direction opposite to the feeding direction of the solid content M _s for drying, the high-temperature heated steam V _b comes into contact with the solid content having a small amount of water at the final stage of drying, so that charring occurs. However, when the solid content M _s and the heated steam V _b are co-flowed in the same direction and dried as in the above-mentioned heated steam dryer 3, the solid content having a large amount of water in the initial stage of drying comes into contact with the high-temperature heated steam, Since the solid content having a low water content in the final stage of drying comes into contact with the heating steam having a lowered temperature, the sticking of the solid content is significantly reduced. Therefore, a deoiled dry feed M _g having a high commercial value is produced. Further, the above-mentioned heated steam dryer 3 has a higher gas volume specific heat than other dryers, and thus can be downsized, and the amount of exhaust steam discharged from the exhaust port 3d is small.

The heating steam generator 4 is, as shown in FIG.
Sealing case 4a and heating chamber 4b formed inside thereof
And a plurality of heating tubes 4c and the like inserted into the heating chamber 4a, and an inlet 4d and an outlet 4e for the combustion gas G are provided at one end of the closed case 4a. The intake port 4d and the exhaust port 4e are isolated by the isolation plate 4f.
Then, at the location communicating with the combustion chamber 4b of the closed case 4a, the above-mentioned exhaust steam V _c (which has been fine particles removed by the cyclone 7 and the scrubber 8) discharged and returned from the heating steam dryer 3 is introduced. and mouth 4g, and inlets 4h of exhaust steam V _d of the aforementioned returned is discharged from蒸洗cooker 1, the exhaust port 4i of heating steam V _b which is heated in the heating chamber 4b is formed.

In such a heating steam generator 4, a high temperature
Combustion gas G flows into the sealed case 4a from the inlet 4d,
Of the heating pipe 4c located closer to the inlet 4d than the separator 4f
Pass through the inside, turn over at the other end of the closed case 4a, and isolate
Inside of the heating pipe 4c located closer to the exhaust port 4e than the plate 4f
Through the exhaust port 4e to the chimney. Meanwhile, heating
Exhaust steam V returned from the steam dryer 3 and steam cleaning cooker 1
_c , V_d Flows into the heating chamber 4b through the air inlets 4g and 4h.
And heat exchange with the heating pipe 4c heated by the combustion gas G
Hot steam V_b And most of it is added from the exhaust port 4i.
It is supplied to the hot steam dryer 3. And heating steam V_b of
Part, that is, heated exhaust steam V_c , V _d Some of the
It is sent to the odor furnace 6.

The separator 4f does not necessarily need to be provided so as to project into the heating chamber 4b like the heating steam generator 4 of this embodiment, but the separator 4f extends to the inside of the heating chamber 4b as described above. When it is installed so as to project, 4 g of air inlet,
Since the distance that the steam flowing from 4h reaches the exhaust port 4i becomes long, there is an advantage that the heat exchange efficiency is improved and the heating is sufficiently performed.

As shown in FIG. 6, the deodorizing furnace 6 has a built-in multi-cylindrical heat storage reaction plate 6a, and this heat storage reaction plate 6a generates high temperature combustion gas G in the burner 5a of the combustion furnace 5. Is stored, and the deodorizing process is performed by oxidizing and decomposing the odorous components of the heating steam V _b introduced into the deodorizing furnace 6. The heated steam V _b deodorized in this way passes through the heated steam generator 4 together with the high temperature combustion gas G and is discharged from the chimney 13.

In FIG. 6, reference numerals 20a, 20b and 20c are flow rate adjusting valves, and by operating these valves, the supply amount of the heating steam _Vb to the heating steam dryer 3 and the heating steam are supplied. The temperature of _Vb can be adjusted. If the temperature of the heated steam V _b is too high, the solid content M _s is liable to cause sticking even in the co-current type heated steam dryer 3. On the other hand, if the temperature is too low, the drying efficiency decreases, so temperature of the vapor V _b, it is desirable to adjust the range of 350 to 450 ° C..

FIG. 8 is a schematic sectional view showing another example of the steam cleaning cooker.

The steam-washing cooker 21 has a tank 21b with a lid 21a, a cage 21c having a myriad of openings detachably attached to the inside of the tank 21b, and a pipe above the cage 21c. It is composed of a steam pipe 21d and a hot water pipe 21e arranged inside the cage 21c, and the tank 21b is attached to a support 21f. And, the steam pipe 21d and the hot water pipe 21e are covered by the lid 21a.
Fixed to the tank 21b by moving the lid 21a upward.
When opened, the steam pipe 21d and the hot water pipe 21e also move upward together with the lid 21a. Hot water pipe 21e
In order to spray the hot water W on the food waste M inside the cage 21c substantially uniformly, the tip portion is branched into several.

The cage 21c is made of punching metal, and the flange 21a at the top of the cage is attached to the tank 21b.
It is detachably attached by being locked to the support protrusion 21h on the inner surface. The bottom surface of the cage 21c is designed to have an enlarged area by the uneven processing so that the broth BL containing oil, salt and the like can be separated quickly.
A discharge port 21i for discharging the separated broth BL is provided at the bottom of the tank 21b.

Further, the steam V injected from the steam pipe 21d
_{In order} to improve the flow of a and to raise the temperature of the food waste M smoothly, the exhaust port 21 is provided on the lower side surface of the tank 21b.
j is provided.

When steam-washing is performed using such a batch-type steam-washing cooker 21, first, the lid 21a is placed on the steam pipe 2
After removing 1d and the hot water pipe 21e together with a predetermined amount of food waste M into the cage 21c, the lid 21a is closed and the hot water pipe 21e is inserted into the food waste M as shown in FIG. Then, the steam V _a is jetted from the steam pipe 21d to heat the food waste M to 90 ° C. or higher to levitate the oil content contained in the food waste, and then to heat the hot water at 90 ° C. or higher from the hot water pipe 21e. The food waste is sprayed to efficiently wash away the floating oil and salt, and the broth BL containing the oil and salt is dropped from the numerous holes on the bottom of the cage 21c.
It is separated and primarily stored at the bottom of the tank 21b.

After the steam washing process is completed, the lid 21a is opened and the basket is opened.
The body 21c is taken out from the tank 21b, and the solid inside the cage is removed.
Minutes are supplied to the above-mentioned feedback mixer 2a and added.
Drying with hot steam dryer 3 reduces the oil content
Non-oiled and dry feed M with good nutritional balance_g To produce.
And, the broth BL at the bottom of the tank 21b is as described above.
To the horizontal centrifuge 10 for solid-liquid separation and further three-phase
Juice content L in the separator 12 ₁ And oil O and sludge S₁ Isolated on
To do. Also, the exhaust vapor V discharged from the exhaust port 21j_d 
Is heated and supplied to the heating steam generator 4 described above.
Use as steam.

This steam-washing cooker 21 can be steam-washed in a batch manner as described above, and has a simple structure and can be easily miniaturized as compared with the continuous-type steam-washing cooker 1 described above.
The equipment cost can be reduced.

Next, the production equipment B (methane gas and biomass production equipment) in the recycling system of the present invention will be described with reference to FIG.

This production facility B produces a high-calorie gas containing methane gas as a main component by fermenting food waste whose foreign matter is difficult to separate, and at the same time, utilizes a part of the gas and digestive liquid to produce biomass. It is a production facility, and as shown in FIG. 9, a heating dissolution tank 31, a methane fermentation tank 32, a gas
Digestive fluid storage tank 33, dehydrator 34, algae culture device 35,
The gas purification device 36 and the like are included.

According to this production facility B, first, before the methane fermentation treatment, the food waste M _{1 in} which foreign matter is difficult to separate is put into the heating dissolution tank 31, and the food waste M ₁ is heated with steam. By solubilizing high-molecular organic matter at high speed, it is converted into a substrate that is easy for methane fermentation. This heat-dissolving treatment may be performed by heating the food waste M _{1 to} a temperature of 90 to 120 ° C., stirring and dissolving it for about 2 hours. Therefore, when this heat dissolution treatment is adopted, the time required for pretreatment can be significantly shortened as compared with the conventional hydrolysis treatment by acid fermentation (treatment period: about 1 week).
At the same time, there is an advantage that sterilization processing (sanitary processing) can be performed.

The heating and dissolving tank 31 is also supplied with a liquid juice component L ₁ separated from the broth BL discharged from the steam-washing cooker 1 of the production facility A described above, and is effectively used as a raw material for methane fermentation.

Viscous liquid L prepared by heating and dissolving food waste M _1.
a is sent to the methane fermentation tank 32 and has a solid content concentration of 4 to 1
It is prepared so as to be 5%, and is subjected to methane fermentation treatment while stirring while maintaining the liquid temperature at 34 to 38 ° C. And a gas MG containing methane gas generated by methane fermentation as a main component
And the digestive liquid L _b are sent to the gas / digestive liquid storage tank 33 and temporarily stored therein.

Most of the gas MG stored in the gas / digested liquid storage tank 33 is sent to the gas refining device 36 for refining and used as high-calorie methane gas for fuel.
Then, the gas MG stored in the gas / digested liquid storage tank 33
Is supplied to the algae culture device 35 and is effectively used for biomass production.

On the other hand, it is stored in the gas / digestion liquid storage tank 33.
Digestive fluid L_b Is sent to the dehydrator 34, where the flocculant is added.
After that, it is dehydrated and solid-liquid separation is performed. And solid
Minute S _a Is sent to composting equipment to produce compost,
Digestive juice L removed_b Sent to the algae culture device 35
It is effectively used for biomass production.

This algae culture device 35 is provided with a case 35a.
And a plurality of culture tanks 35b installed therein, and a plurality of light sources 35c arranged above the culture tank 35b. Inorganic nutrients are dissolved in each culture tank 35b. It contains the culture solution and the digestive solution L _b supplied from the dehydrator 34. The bottom of each culture tank 35b is formed of a diffuser plate, and the gas MG supplied from the gas / digestion storage tank 33 is diffused from the diffuser plate into the culture tank 35b. . As the light source 35c, red or blue LEDs are used in addition to the incandescent light bulb.

Each culture tank 3 of such an algae culture device 35
When algae are put into 5b and cultured, the gas MG diffused from the diffuser plate at the bottom of each culture tank contains a larger amount of carbon dioxide gas than air, and the digestive liquid L _b supplied to each culture tank is increased. Since a large amount of nitrogen is contained in, algae can ingest carbon and nitrogen in carbon dioxide and proliferate vigorously to efficiently produce biomass. The culture temperature is room temperature (25
℃). The produced biomass is fed to livestock as a feed in a liquid state, or is fed to livestock as a dry feed.

Euglena (Euglena) is the most suitable alga to be cultivated. This euglena shows high adaptability to carbon dioxide gas, can be cultivated at high density, and can be used as a feed biomass by optimizing the medium composition. It has the advantages that it can be mass-produced constantly throughout the year, and that it can be cultured in a closed system and the medium can be reused.

Next, referring to FIG. 10, the production facility C (fermentation mixed feed production facility) in the recycling system of the present invention.
Will be explained.

The production facility C is a facility for producing a fermentation mixed feed M _m by mixing food waste, other raw materials, lactic acid bacteria and the like, and as shown in FIG. 10, a mixer type fermentation device 41, nitrogen. It is composed of a gas generator 42, a conveyor 43, a bagging device 45 with a suction device 44, and the like.

According to this production facility C, first, a mixer type fermentation apparatus 4 having several screws 41a incorporated therein is used.
Food waste, other raw materials, lactic acid bacteria, etc. are put into 1 and mixed with the screw 41a, and lactic acid fermentation is carried out in the atmosphere of nitrogen gas supplied from the nitrogen gas generator 42 to the fermentation apparatus 41.

As the raw material food waste, there are used okara from the tofu manufacturing plant, noodle residue from the noodle manufacturing plant, squeezed lees of grapes and fruits from the alcoholic manufacturing plant, and other raw materials. Sudan grass and other hay and grains are used. As the fermentation bacterium, yeasts and the like are used in combination with the above-mentioned lactic acid bacterium.

As described above, when lactic acid fermentation is performed while mixing food waste, other raw materials, and lactic acid bacteria in an atmosphere of nitrogen gas, the anaerobic lactic acid bacteria are activated to promote acid fermentation. Thus, the fermented mixed feed M _m , which is appropriately fermented in only about 1 day, can be efficiently produced. Especially 3
If the fermentation is carried out by heating to around 5 ° C., the acid fermentation becomes active, so it is preferable to perform the fermentation by heating. The mixed feed M _m fermented with lactic acid has a high digestibility,
Since it has a low pH, it can also suppress spoilage, and is therefore extremely effective as a feed.

The fermented mixed feed M _m produced inside the fermentation device 41 is taken out to the outside by the screw conveyor 41b incorporated in the fermentation device 41 and transferred to the supply hopper 45a of the bag filling device 45 by the conveyor 43. . The fermented mixed feed M _m is supplied from the supply hopper to the inside of the bag filling device 45 and filled in the flexible container bag, and the suction device 44 sucks the air in the flexible container bag and packs it. When air is sucked and packed in this way,
Even after that, lactic acid fermentation continues due to the action of anaerobic lactic acid bacteria, resulting in an aged fermented mixed feed.

In the above, the food waste recycling system according to the present invention has been described by exemplifying specific embodiments.
The present invention is not limited to these embodiments, and various design changes can be allowed without departing from the scope of the claims.

[0090]

EFFECTS OF THE INVENTION The food waste recycling system according to the present invention contains an oil content by steaming and drying the food waste from which foreign substances have been separated in the production equipment A (deoiled dry feed production equipment). It is possible to efficiently produce deoiled dry feed with a small amount and good nutritional balance, and for food waste in which foreign matter is difficult to separate, ferment methane in production facility B (methane gas and biomass production facility). In addition to producing high-calorie gas, the generated gas and digestive juice can be effectively used to produce valuable biomass as feed. Furthermore, in production facility C (fermentation mixed feed production facility), food waste and other By fermenting the raw materials of lactic acid and lactic acid bacteria etc. in a nitrogen atmosphere, it is possible to efficiently produce a fermented mixed feed with high digestibility and resistance to spoilage. , An effect such food waste from such food service industry and food manufacturing plants can without waste recycled as livestock feed and fuel such as a high added value.

[Brief description of drawings]

[Figure 1] (a) (b) (c) (d) (e) (f) (g)
FIG. 1 is a conceptual diagram showing the recycling system of food waste according to the present invention by type.

FIG. 2 is an explanatory diagram of an embodiment of a deoiled dry feed production facility A in the recycling system of the present invention.

FIG. 3 is a perspective view of a main part of a steam cleaning cooker in the production facility A.

FIG. 4 is a schematic vertical sectional view of the steam cleaning cooker.

FIG. 5 is a schematic cross-sectional view of the steam cleaning cooker.

FIG. 6 is an explanatory view of a heating steam dryer, a heating steam generator, a combustion furnace, and a deodorizing furnace in the production facility A.

FIG. 7 is a schematic cross-sectional view of the heating steam dryer.

FIG. 8 is a schematic sectional view showing another example of a steam cleaning cooker.

FIG. 9 is an explanatory diagram of an embodiment of methane gas and biomass production facility B in the recycling system of the present invention.

FIG. 10 is an explanatory diagram of an embodiment of a fermentation mixed feed production facility C in the recycling system of the present invention.

[Explanation of symbols]

A Deoiled dry feed production equipment B Methane gas and biomass production equipment C Fermentation mixed feed production equipment M Food waste M _{1 from which} foreign matter has been separated Food waste _{1 from which} foreign matter is difficult to separate 1 Steam-washing cooker (continuous type) 1e Countless openings 1p Steam pipe 1q Hot water pipe 2a Feedback mixer 3 Heating steam dryer 3a Rotary drying furnace 4 Heating steam generator 5 Combustion furnace 6 Deodorizing furnace 7 Cyclone 8 Scrubber 9 Concentrator 10 Horizontal centrifuge 11 Heating tank 12 Three-phase separator 17 Ori precipitation tank 21 Steam washing cooker (batch type) 21a Lid 21b Tank 21c Basket 21d with innumerable openings 21d Steam pipe 21e Hot water pipe 31 Heating dissolution tank 32 Methane fermentation tank 33 Gas / digestion liquid storage tank 35 Algae culture device 36 Gas purification device 41 Mixer type fermentation device 42 Nitrogen gas generator 44 Suction device 45 Bagging equipment

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C12M 1/00 B09B 3/00 303M C10L 3/00 A (71) Applicant 000006851 Yanmar Agricultural Machinery Co., Ltd. Osaka, Osaka 1-32, Chaya-cho, Kita-ku, Japan (71) Applicant 501366904 Cosmo Co., Ltd. 50-1, Gunto, Habikino-shi, Osaka (72) Inventor Nagahisa Nakano 1-1, Sakai City Gakuenmae, Osaka Prefecture (72) ) Inventor Tadaaki Mori 2-3-3 Showa-cho, Abeno-ku, Osaka City, Osaka Prefecture Mori Plant Co., Ltd. (72) Inventor Yoshihiko Kurahashi 2-3-3 Showa-cho, Abeno-ku Osaka City, Osaka Prefecture Mori Plant Co., Ltd. (72) Riki Takase 6-3-10 Fuji Town, Kushiro City, Hokkaido Kushiro Giken Co., Ltd. (72) Inventor Mitsugu Saito Fuji, Kushiro City, Hokkaido 6-3-10 Kushiro Giken Co., Ltd. (72) Inventor Mitsunobu Masuda 2-32 Kinrakujicho Amagasaki City, Hyogo Prefecture Takumauchi (72) Incorporated company, Masayuki Fujii Ume Umehara, Sakata-gun, Shiga Prefecture Kahara 1600-4 Yanmar Agricultural Machinery Co., Ltd. Central Research Laboratory (72) Inventor Kazuhito Watanabe 50-1 Gunto, Habikino-shi, Osaka Cosmo Co., Ltd. F-term (reference) 2B150 AA01 AB20 BB01 CD37 4B029 AA03 BB01 CC02 EA03 4D004 AA04 BA03 BA04 CA13 CA15 CA18 CA22 CA42 CA46 CB04 CB31 CB45 CC07 DA03 DA06 4D057 AA13 AB01 AC02 AD01 AE03 AF01

Claims (8)

[Claims] 1. A deoiled and dried feed production facility A equipped with at least a steam washing cooker and a heating steam dryer, a methane gas and biomass production facility B equipped with at least a heating dissolution tank, a methane fermentation tank, and an algae cultivation apparatus, and a mixer type. A fermentation mixed feed production facility C equipped with at least a fermentation apparatus and a nitrogen gas generator is provided with one or more facilities, and foreign matter is separated into the steam-washed cooker of the above deoiled and dried feed production facility A. Supplied food waste, heated to 90 ° C or higher by steam to float the oil in the food waste, and then 90 ° C
The above-mentioned warm water is sprayed on food waste to perform a steam washing treatment for removing oil and salt, and the production of a deoiled dry feed characterized by drying the separated solid content with a heating steam dryer. Gas containing methane gas as a main component is introduced into the heating dissolution tank of methane gas and biomass production facility B by adding food waste in which foreign matter is difficult to separate and heating to solubilize it, and introducing the solution into the methane fermentation tank. And a part of the generated gas and a digestive liquid are supplied to an algae culturing apparatus to cultivate algae to produce biomass, the production of methane gas and biomass, the mixer of the above-mentioned fermentation mixed feed production facility C. Into a fermenter of the type, lactic acid fermentation is performed in the atmosphere of nitrogen gas supplied from the nitrogen gas generator to the fermenter while adding and mixing food waste, other raw materials, and lactic acid bacteria. Recycling system of food waste which is characterized in that either one or more of the production of production, the fermentation mixed feed to. 2. The deoiled dry feed production facility A as described above,
The broth containing the oil and salt removed by the steam washing treatment is further subjected to solid-liquid separation with a horizontal centrifuge, and the separated liquid is separated into sap, oil and sludge with a three-phase separator. Food waste recycling system. 3. In the deoiled dry feed production facility A,
The food waste according to claim 1, wherein the exhaust steam discharged from the heating steam dryer is sequentially supplied to a cyclone and a scrubber to remove fine powder, and is again supplied to the heating steam dryer as heating steam in the heating steam generator. Recycling system. 4. A steam-washing cooker in the deoiled dry feed production facility A comprises a rotating cylinder having innumerable openings, a steam pipe provided outside the rotating cylinder, and a pipe provided inside the rotating cylinder. A rotary cylinder which feeds steam to the other end while the food waste supplied to one end of the rotary cylinder is sent toward the other end by rotation of the rotary cylinder. The food waste is heated to 90 ° C or more to levitate the oil content in the food waste by spraying it onto the food waste, and the hot water pipe at which 90 ° C or more hot water is sprayed onto the food waste to give oil and salt content. The recycling system for food waste according to claim 1, wherein the broth containing the is separated and removed to the outside of the rotary cylinder through a myriad of openings in the rotary cylinder. 5. The steam-washing cooker in the deoiled dry feed production facility A comprises a tank with a lid, a cage having a myriad of openings detachably attached to the inside of the tank, and a cage above the cage. A pipe provided with at least a steam pipe and a hot water pipe provided inside the basket, and by injecting steam from the steam pipe into the food waste supplied inside the basket, a food product is obtained. The waste is heated to 90 ° C or higher to float the oil in the food waste, and sprayed with hot water of 90 ° C or higher from the hot water pipe onto the food waste to make a broth containing oil and salt. The food waste recycling system according to claim 1, which is separated and removed through a myriad of openings. 6. The heating steam dryer in the deoiled dry feed production facility A comprises at least a cylindrical rotary drying furnace, and the solid content supplied to one end of the rotary drying furnace is rotated by the rotation of the drying furnace. The food waste recycling system according to claim 1, wherein the heated steam is sent from one end of the rotary drying furnace to the other end while being sent toward the other end, thereby causing the solid content and the heated steam to flow in parallel. . 7. The food waste recycling system according to claim 1, wherein in the methane gas and biomass production facility B, the algae cultivated by the algae culturing device is Euglena. 8. The fermentation mixed feed production facility C as described above,
The resource recycling system for food waste according to claim 1, wherein the fermented mixed feed fermented with lactic acid by a mixer-type fermenting device is supplied to a bagging device equipped with a suction device and packed while sucking.