Larva collection device for insects belonging to the order Diptera (flies).

Abstract

To provide a system for collecting larvae of an inspect belonging to Diptera capable of collecting larvae by securely being separated from organic wastes.SOLUTION: A system for collecting larvae of an inspect has a treatment tank provided with a culture medium for breeding larvae of an insect belonging Diptera, a collection tank arranged by superposition under the treatment tank to collect larvae bred in the culture medium, and a plurality of separation tanks arranged by superposition between the treatment tank and the collection tank. The treatment tank has a plurality of open holes in the bottom through which larvae can pass. The plurality of separation tanks comprises first separation tanks having a plurality of second open holes in a first region a part of the bottom through which larvae can pass, and second separation tanks having a plurality of third open holes in a second region a part of the bottom through which larvae can pass. Further, the first region and the second region are so arranged that may be not superposed in a plane view.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] One embodiment of the present invention relates to an apparatus for breeding and collecting larvae of insects belonging to the order Diptera.

Background Art

[0002] Housefly larvae prefer to inhabit an environment with moderate humidity during the growth stage and have the habit of moving to a relatively dry environment when pupating. Utilizing such habits, an apparatus has been disclosed that allows housefly larvae to ingest organic waste and collect the grown larvae (see, for example, Patent Documents 1 and 2).

[0003] The apparatus disclosed in Patent Document 1 uses a breeding container that houses organic waste as food for housefly larvae and breeds the larvae. The breeding container includes a storage portion for storing organic waste and an exit opening through which the housefly larvae that pupate crawl out. The exit opening is formed by an inclined wall surface with an inclination of 5 to 15 degrees. Also, the apparatus disclosed in Patent Document 2 has a structure in which an inclined wall surface for guiding the housefly larvae that pupate is provided in the breeding container. And these apparatuses have a mechanism in which the housefly larvae that climb the inclined wall surface fall from the outer end of the inclined wall surface into a collection container provided below and are collected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional devices for collecting housefly larvae have a problem in that they cannot collect all larvae from the rearing container, and some larvae may remain in the organic waste provided as food (the residue after the larvae have consumed it becomes feed and fertilizer material). Because the rearing container needs to have sloped walls, the thickness of the organic waste provided as food becomes uneven, and the processing of the organic waste by the larvae does not proceed uniformly, resulting in some of it being collected unprocessed. In addition, if organic waste residue gets mixed in with the larvae in the collection tank, the quality of the collected material (larvae) deteriorates.

[0006] One embodiment of the present invention has been made in view of these problems and aims to provide a larval recovery device for flies that can uniformly process organic waste and reliably separate and recover the larvae from the organic waste. [Means for solving the problem]

[0007] One embodiment of the present invention aims to efficiently separate insect larvae classified under the order Diptera from larvae carcasses, pupae, or smaller organic waste residues that are approximately the same size as the larvae. This is achieved by utilizing the larvae's habit of moving in search of a suitable environment when pupating, and separating the larvae from organic waste or processing residues present in the larval culture medium using a separation tank with a bottom surface having appropriately spaced through-holes. The larva recovery device according to one embodiment of the present invention has multiple separation tanks, and the areas of the through-holes in adjacent tanks above and below are arranged so as not to overlap, thereby efficiently separating the larvae from larva carcasses, pupae, or smaller organic waste residues that have spilled from the culture medium.

[0008] Multiple through-holes are arranged at appropriate intervals, allowing larvae to pass through and fall into the lower separation tank. Meanwhile, larval carcasses, pupae, or smaller organic waste remains are left in the continuous area between adjacent through-holes. Furthermore, by using multiple separation tanks, residual organic waste attached to the larvae is separated from them through repeated movement and falling of the insects. Thus, larvae can be efficiently separated from the treated waste residue.

[0009] A larval recovery device for insects belonging to the order Diptera according to one embodiment of the present invention comprises a recovery tank for recovering larvae reared in a culture medium, and a plurality of separation tanks arranged in stacks between the culture medium and the recovery tank. The plurality of separation tanks include a first separation tank having a plurality of first through-holes in a first region which is part of the bottom surface through which larvae can pass, and a second separation tank having a plurality of second through-holes in a second region which is part of the bottom surface through which larvae can pass. The first region and the second region are arranged so as not to overlap in a plan view.

[0010] A larval recovery device for insects belonging to the order Diptera according to one embodiment of the present invention comprises a processing tank provided with a culture medium for rearing larvae of insects belonging to the order Diptera, a recovery tank placed on top of the processing tank for recovering larvae reared in the culture medium, and a plurality of separation tanks placed on top of each other between the processing tank and the recovery tank. The processing tank has a plurality of first through-holes in its bottom surface through which larvae can pass. The plurality of separation tanks include a first separation tank having a plurality of second through-holes in a first region which is part of the bottom surface through which larvae can pass, and a second separation tank having a plurality of third through-holes in a second region which is part of the bottom surface through which larvae can pass. The first region and the second region are arranged so as not to overlap in a plan view.

[0011] In one embodiment of the present invention, the second separation tank has a barrier erected from its bottom surface, and the barrier may be provided such that it conceals the area of ​​the bottom surface of the second separation tank other than the area that overlaps with the second area and the first area.

[0012] In one embodiment of the present invention, an offset region may be present between the first region and the second region in a plan view.

[0013] In one embodiment of the present invention, the multiple separation tanks and recovery tanks may each have ventilation openings at their upper ends. Furthermore, a blower may be provided to supply air to the ventilation openings.

[0014] In one embodiment of the present invention, the first region and the second region are formed of a fabric, and the weave of the fabric may be coarse enough to allow larvae to pass through.

[0015] In one embodiment of the present invention, it is preferable that the diameters of the first through hole, the second through hole, and the third through hole are 3 mm or more and 5 mm or less. [Effects of the Invention]

[0016] According to one embodiment of the present invention, a processing tank for rearing the larvae of insects belonging to the order Diptera is provided with through-holes in the bottom surface through which the larvae can pass, a recovery tank is provided in the lower section, and a multi-stage separation tank is provided between the processing tank and the recovery tank, and the through-holes in the bottom surface of the separation tank are arranged so that they do not overlap with each other, thereby ensuring that organic waste or processing residue is separated from the larvae, and preventing any foreign matter other than larvae from entering the recovery tank. [Brief explanation of the drawing]

[0017] [Figure 1] The configuration of a larval recovery device according to one embodiment of the present invention is shown, and (A) and (B) are cross-sectional views thereof. [Figure 2] The configuration of a larval recovery device according to one embodiment of the present invention is shown, and (A) to (D) are top views thereof. [Figure 3] The diagram shows the configuration of the separation tank of a larval recovery device according to one embodiment of the present invention, with (A) to (C) being top views thereof. [Figure 4] Figure (A) and (B) show a larval recovery device according to one embodiment of the present invention, illustrating its method of use. [Figure 5] It is a diagram for explaining the usage method of a larva collection device for insects belonging to the order Diptera according to an embodiment of the present invention. [Figure 6] It shows the configuration of the separation tank of the larva collection device according to an embodiment of the present invention, and (A) to (C) are top views thereof. [Figure 7] It shows the configuration of the separation tank of the larva collection device according to an embodiment of the present invention, and (A) to (C) are top views thereof. [Figure 8] It is a cross-sectional view showing the configuration of the larva collection device according to the present embodiment. [Figure 9] It shows the configuration of the larva collection device according to the present embodiment, where (A) is a top view and (B) is a cross-sectional view. [Figure 10] It shows the configuration of the larva collection device according to the present embodiment, where (A) is a top view and (B) is a cross-sectional view. [Figure 11] It shows the configuration of the larva collection device according to the present embodiment, where (A) is a top view and (B) is a cross-sectional view. [Figure 12] It is a cross-sectional view showing the configuration of the larva collection device according to an embodiment of the present invention. [Figure 13] It is a cross-sectional view showing the configuration of the larva collection device according to an embodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. However, the present invention can be implemented in many different modes, and is not to be construed as being limited to the description of the embodiments exemplified below. The drawings may be schematically represented in terms of the length, width, height, thickness, shape, etc. of each part compared to the actual mode in order to make the explanation clearer, but this is merely an example and does not limit the interpretation of the present invention. Also, in this specification and each figure, the same reference numerals (or reference numerals with A, B, etc. appended after the number) may be given to the same elements as those described above with respect to the already shown figures, and detailed description may be appropriately omitted. Furthermore, the letters "first" and "second" appended to each element are for convenience of distinguishing each element, and have no further meaning unless otherwise specified.

[0019] The larval recovery device in one embodiment of the present invention is a device that raises insect larvae belonging to the order Diptera by feeding them organic waste, and separates and recovers the insect larvae belonging to the order Diptera from the organic waste that the larvae have consumed, the carcasses of the larvae, pupae, and other remaining materials (hereinafter also referred to as "processing residue") before the larvae pupate. In the following description, unless otherwise specified, insect larvae belonging to the order Diptera will simply be referred to as "larvae." Furthermore, depending on the growth stage of the larvae, they may also be referred to as "1-day-old larvae," "2-day-old larvae," "3-day-old larvae," "4-day-old larvae," "5-day-old larvae," "6-day-old larvae," "7-day-old larvae," and "8-day-old larvae."

[0020] In this specification, "processed material residue" refers to the remaining organic waste as described above, and includes larval excrement (low-concentration organic decomposition products), microbial excrement that was originally contained in the organic waste or was introduced during the process of processing the organic waste, dried organic waste (organic waste that remains without being consumed by insects), and pupae.

[0021] In this specification, "separation" when referring to separating larvae from the treated material residue means separating the treated material residue from the larvae, and includes the movement (escape) of larvae from the treated material residue through through holes, as described in the following embodiments. Furthermore, removing larval carcasses, pupae, etc., remaining in the treated material residue by sieving or the like is also included in the scope of separation.

[0022] In this specification, "recovering larvae" means collecting the separated larvae in a designated area or container. As described in the embodiments below, "recovering" refers to dropping the larvae from a culture medium containing organic waste (hereinafter referred to as "culture medium") through through holes and accumulating them in a container.

[0023] [First Embodiment] Details of a larval collection device for insects belonging to the order Diptera (hereinafter also simply referred to as the "larval collection device") according to one embodiment of the present invention will be described with reference to Figures 1 and 2. In the following description, housefly larvae will be used as an example of insect larvae, but in addition to housefly larvae, flesh flies, soldier flies, and other insects belonging to the order Diptera can also be used.

[0024] Figure 1(A) is a cross-sectional view showing the main components of the larva recovery device 100 according to this embodiment. The larva recovery device 100 includes a recovery tank 104 and a plurality of separation tanks 105. A processing tank 102 in which a culture medium is formed is provided above the recovery tank 104. The larva recovery device 100 has a structure in which the recovery tank 104, the plurality of separation tanks 105, and the processing tank 102 are stacked from bottom to top. Figure 1(A) shows an example in which the plurality of separation tanks 105 include a first separation tank 105A, a second separation tank 105B, and a third separation tank 105C. Figures 2(A) to (D) show top views of the processing tank 102 and the plurality of separation tanks 105 (first separation tank 105A, second separation tank 105B, third separation tank 105C) among these components.

[0025] The processing tank 102 is a container in which a culture medium for rearing larvae is provided. The culture medium is formed from organic waste 201. The recovery tank 104 is a container for recovering the larvae reared in the processing tank 102. The recovery tank 104 is located below the processing tank 102. The separation tank 105 is a container that forms a path for the larvae that crawl out of the processing tank 102 to the recovery tank 104, and also prevents organic waste or its residues that spill out of the processing tank 102 from mixing into the recovery tank 104. The separation tank 105 is used sandwiched between the processing tank 102 and the recovery tank 104.

[0026] As shown in Figure 1(A), the treatment tank 102 has a bottom surface 1021 and walls 1022 surrounding the bottom surface 1021, and has a box-shaped form with an open top. Organic waste 201 is spread in the treatment tank 102 so as to cover the entire bottom surface 1021, forming a culture medium for rearing larvae. The treatment tank 102 can be filled with organic waste 201 to a predetermined thickness and has a depth (height of walls 1022) such that larvae cannot easily crawl out.

[0027] Larvae prefer a humid environment and feed on prey while peristalsing within the culture medium. The condition of the culture medium formed in the treatment tank 102 affects the growth of the larvae. If the moisture content of the culture medium is too high or the medium is too thick, the larvae will have difficulty breathing and their survival rate will decrease. Therefore, the organic waste 201 introduced into the treatment tank 102 is spread out so that it contains an appropriate amount of moisture and is of an appropriate thickness. Depending on the type of organic waste 201, the culture medium formed in the treatment tank 102 by the organic waste 201 can be made suitable for larval growth by having a moisture content of 60-80% and a thickness of 30-80 mm, preferably 40-50 mm.

[0028] Organic waste 201 that can be used to form the culture medium includes, for example, at least one of livestock manure, food waste, and agricultural waste. Livestock manure is the excrement of livestock such as cow manure, pig manure, and chicken manure. Food waste is processing residue and leftover food generated during the manufacturing and cooking of food, specifically including vegetable scraps, tofu scraps, okara (soy pulp), sake lees, shochu lees, beer lees, etc., and also includes kitchen waste discarded from households, etc. Agricultural waste is the remains of crops that are not used for food, including the stems, leaves, peels, bean husks, rice bran, and wheat bran of crops.

[0029] The culture medium formed in the treatment tank 102 is inoculated with the eggs of insects belonging to the order Diptera (hereinafter also simply referred to as "eggs" or "insect eggs"). For example, the culture medium is inoculated with housefly eggs. After inoculation, the housefly eggs hatch in about one day. The larvae that hatch from the eggs (1-day-old larvae) feed on organic waste 201 in the treatment tank 102 and grow into larvae that undergo pupal metamorphosis (3-day-old larvae) in about 4 to 7 days.

[0030] Larvae (3-day-old larvae) undergoing pupal metamorphosis in organic waste 201 attempt to move from the moisture-containing organic waste 201 medium to dry or dark areas due to their peristaltic discrete behavior. A first through-hole 1024 is provided in the bottom surface 1021 of the treatment tank 102. The first through-hole 1024 is an exit hole for the larvae (3-day-old larvae) to move from the moist organic waste 201 to the dry outside environment. The presence of the first through-hole 1024 in the bottom surface 1021 guides the larvae (3-day-old larvae) to the first through-hole 1024. There is no limit to the number of first through-holes 1024 provided in the bottom surface 1021, but it is preferable that they be provided across the entire bottom surface 1021 in order to easily guide the larvae (3-day-old larvae) that have grown in the organic waste 201.

[0031] The first through-hole 1024 is large enough for a larva (3-day-old larva) that is about to undergo pupal metamorphosis to pass through. The size of the first through-hole 1024 is set appropriately depending on the type of insect. For example, in the case of a housefly, the hole diameter is set to about 3 mm to 5 mm. The spacing between the first through-holes 1024 is preferably about 3 mm to 15 mm. If the diameter of the first through-hole 1024 is smaller than this range, it becomes difficult to separate the larva (3-day-old larva) from the organic waste 201 by letting it pass through. If it is too large, the amount of organic waste 201 that falls through the first through-hole 1024 into the collection tank 104 increases, which is undesirable. Also, if the spacing between the first through-holes 1024 is smaller than the above range, the organic waste 201 will fall through the first through-hole 1024 along with the larva, which is undesirable. Furthermore, if the spacing between the first through-holes 1024 is greater than the above range, the distance the larva travels will increase, and the time it takes for the larva to reach the first through-holes 1024 will be longer, which is undesirable. There are no limitations on the shape of the first through-holes 1024 in plan view, and various shapes such as round, elliptical, square, rectangular, rhombus, and hexagonal can be applied.

[0032] There are no limitations on the material of the processing tank 102, but a material with sufficient rigidity to maintain its shape as a container is used. The processing tank 102 is made of, for example, metal, plastic, or wood. The bottom surface 1021 and the walls 1022 of the processing tank 102 may be integrated, or the bottom surface 1021 and the walls 1022 may have a structure that allows them to be separated into part or all of them.

[0033] As shown in Figure 2(A), the bottom surface 1021 is provided with first through-holes 1024 that extend across its entire surface. The bottom surface 1021 is made of metal, plastic, or wood, but cloth may be used instead of these materials. When the bottom surface 1021 is made of a material such as metal, plastic, or wood, the first through-holes 1024 of the above size can be formed across its entire surface, and the reduction in rigidity (mechanical strength) can be suppressed even if the number of first through-holes 1024 is increased. When part or all of the bottom surface 1021 is made of cloth, it is preferable that the weave of the cloth is rough enough to allow larvae to pass through, or that holes or cuts of a size that allows larvae to pass through are formed in the cloth. However, since cloth does not have rigidity, it is unsuitable to form the processing tank 102 with cloth alone. Therefore, when forming the bottom surface 1021 with cloth, it is preferable to attach it to the wall surface 1022 made of metal, plastic, or wood.

[0034] The separation tank 105 is composed of at least one, preferably more than one, tank. In the example shown in Figure 1(A), the separation tank 105 has a structure in which three separation tanks are stacked on top of each other from the side of the processing tank 102: a first separation tank 105A, a second separation tank 105B, and a third separation tank 105C. The first separation tank 105A has a bottom surface 1051A and a wall surface 1052A surrounding the bottom surface 1051A, and has a box-shaped form with an open top. The second separation tank 105B has a bottom surface 1051B and a wall surface 1052B surrounding the bottom surface 1051B, and has a box-shaped form with an open top. Similarly, the third separation tank 105C has a bottom surface 1051C and a wall surface 1052C surrounding the bottom surface 1051C, and has a box-shaped form with an open top.

[0035] The bottom surface 1051A of the first separation tank 105A is provided with a second through-hole 1054A in a certain area through which larvae can pass. At least one, preferably more than one, second through-hole 1054A is provided on the bottom surface 1051B. Figures 1(A) and 2(B) show the area in the first separation tank A where multiple second through-holes 1054A are provided as the first region 1055A. The first region 1055A is not an area that extends across the entire bottom surface 1051A, but is provided in a part of the bottom surface 1051A. The first region 1055A can be provided at any position on the bottom surface 1051A, but as will be described later, it is provided in a position that does not overlap with the second region 1055B provided in the second separation tank 105B.

[0036] As is clear from the above structure, the first separation tank 105A has a floor portion that receives larvae falling from the processing tank 102 and a first region 1055A provided with a second through-hole 1054A. As shown in Figures 1(A) and 2(C), the second separation tank 105B similarly has a bottom surface 1051B and a second region 1055B provided in a part of the bottom surface 1051B. The second region 1055B is provided with at least one, preferably a plurality of, third through-holes 1054B. As shown in Figures 1(A) and 2(C), the third separation tank 105C has a bottom surface 1051C and a third region 1055C provided in a part of the bottom surface 1051C. The third region 1055C is provided with at least one, preferably a plurality of, fourth through-holes 1054C. The second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C have the same diameter as the first through-hole 1024 and are provided in their respective regions at similar intervals.

[0037] Figures 2(B) to 2(C) show an example in which the first region 1055A in the first separation tank 105A is located on the left side of the bottom surface 1051A, the second region 1055B in the second separation tank 105B is located in the center of the bottom surface 1051B, and the third region 1055C in the third separation tank 105C is located on the right side of the bottom surface 1051C. As is clear from Figures 1(A) and 2(B) to 2(C), the first region 1055A, the second region 1055B, and the third region 1055C are positioned so as not to overlap each other when the larval collection device 100 is viewed from above (in a plan view).

[0038] As described later, the larvae (3-day-old larvae) that fall from the treatment tank 102 are collected in the recovery tank 104 via the separation tank 105. When the larvae (3-day-old larvae) fall from the treatment tank 102, a small amount of organic waste 201 or processed material residue 202 may also fall. However, by configuring the separation tank 105 in a multi-stage configuration and arranging the areas where the through-holes 1054 in each separation tank are provided so that they do not overlap in terms of upper and lower stages, it is possible to prevent the organic waste 201 or processed material residue 202 spilled from the treatment tank 102 from mixing with the recovery tank 104. In other words, larvae in the culture medium and larvae that fall from the culture medium into the separation tank 105 move on their own, passing through the through-holes 1054 and gradually moving to the recovery tank 104. However, the culture medium and the organic waste 201 or processed material residue 202 that spills from the culture medium into the separation tank 105 do not move, so they remain in place and are prevented from being mixed into the recovery tank 104. Even if a lump of organic waste 201 or processed material residue 202 smaller than the diameter of the through-holes 1054 falls in, the separation tank 105 is multi-tiered, and the areas where the through-holes 1054 are provided are arranged so that they do not overlap vertically. As a result, the spilled organic waste 201 or processed material residue 202 can be caught in the separation tank directly below, thus preventing it from being mixed into the recovery tank 104.

[0039] In Figures 2(B) to (D), the first region 1055A, the second region 1055B, and the third region 1055C are each rectangular. However, the shape and extent of these regions can be changed as appropriate, as long as they do not overlap. For example, as shown in Figures 3(A) to (C), multiple first regions 1055A are provided in the first separation tank 105A, multiple second regions 1055B are provided in the second separation tank 105B, and multiple third regions 1055C are provided in the third separation tank 105C. The multiple first regions 1055A and multiple second regions 1055B are arranged so that they do not overlap in a plan view, and the multiple second regions 1055B and multiple third regions 1055C are arranged so that they do not overlap in a plan view. In other words, the arrangement of the first region 1055A and the second region 1055B, and the arrangement of the second region 1055B and the third region 1055C, may be arranged in a checkerboard pattern so that they do not overlap with each other. With such an arrangement, the regions 1055 in which the through-holes 1054 are provided can be arranged discretely within the separation tank 105, and the distance that the fallen larvae have to travel to the through-holes 1054 can be shortened. By using such a separation tank 105, the larvae can be recovered into the recovery tank 104 more efficiently.

[0040] As shown in Figure 1(A), an offset region 1057A may be provided between the first region 1055A and the second region 1055B so that the two regions do not completely overlap. Similarly, an offset region 1057B may be provided between the second region 1055B and the third region 1055C. By providing offset regions 1057A and 1057B, the areas where the through holes 1051 overlap can be eliminated, and even if organic waste 201 or processed material residue 202 falls diagonally from the upper tank to the lower tank, or rolls sideways after falling, it is possible to prevent it from spilling into the tank further down.

[0041] The recovery tank 104 has a bottom surface 1041 and walls 1042 surrounding the bottom surface 1041, and has a box-shaped form with an open top. The recovery tank 104 is a container for ultimately recovering larvae that have escaped through the first through-hole 1024 provided in the bottom surface 1021 of the processing tank 102. The recovery tank 104 is used to temporarily store larvae (3-day-old larvae) that have fallen from the processing tank 102 and passed through the separation tank 105. Since the larvae (3-day-old larvae) that have fallen from the processing tank 102 can peristalt, it is preferable that the walls 1042 of the recovery tank 104 have a certain height to prevent the larvae (3-day-old larvae) from escaping.

[0042] As shown in Figure 1(A), the treatment tank 102, separation tank 105, and recovery tank 104 have the same outer diameter and are arranged in a stacked configuration. When the treatment tank 102, separation tank 105, and recovery tank 104 are stacked, projections, guide grooves, etc., may be provided on the upper and lower edges of each tank to prevent the lower and upper parts of each tank from fitting together and shifting position. In addition, the treatment tank 102, separation tank 105, and recovery tank 104 may have a structure that allows them to be fastened together with screws, clamps, etc., when stacked. By arranging the treatment tank 102, separation tank 105, and recovery tank 104 in a way that allows for easy attachment and detachment, it is possible to easily perform tasks such as inputting organic waste 201, inoculating insect eggs, collecting larvae, and cleaning each tank.

[0043] The processing tank 102, separation tank 105, and recovery tank 104 are stacked in multiple layers, preventing larvae that fall from the processing tank 102 from escaping to the recovery tank 104. The bottom surface 1021 of the processing tank 102 is provided with a first through-hole 1024, the first separation tank 105A is provided with a second through-hole 1054A, the second separation tank 105B is provided with a third through-hole 1054B, and the third separation tank 105C is provided with a fourth through-hole 1054C, thus maintaining ventilation in the recovery tank 104 and preventing the recovered larvae from suffocating.

[0044] The separation tank 105 provides a path for larvae that have fallen from the processing tank 102 to reach the recovery tank 104. As shown in Figure 1(B), the separation tank 105 may be provided with a barrier 1056 to restrict the movement of larvae. Figure 1(B) shows an example in which a barrier 1056 is provided in the second separation tank 105B and the third separation tank 105C. In the second separation tank 105B, the barrier 1056 is provided in a position to prevent larvae that have fallen from the first separation tank 105A from moving beyond the second area 1055B to the right side of the tank. In the third separation tank 105C, the barrier 1056 is provided in the area to the left of the second area 1055B to prevent larvae that have fallen from the second separation tank 105B from moving to the opposite side of the third area 1055C. In other words, the second separation tank 105B is provided with a barrier 1056 to conceal the area other than the second region 1055B and the area that overlaps with the first region 1055A in a plan view. Similarly, the third separation tank 105C is provided with a barrier 1056 to conceal the area other than the third region 1055C and the area that overlaps with the second region 1055B in a plan view. By providing the separation tanks 105 with barriers 1056 that restrict the movement of larvae, larvae that fall from the processing tank 102 can be reliably collected in the collection tank 104, thereby reducing the time required for collection.

[0045] Alternatively, the collection tank 104 may be filled with water, hot water, or disinfectant solution, allowing the larvae to be washed or disinfected on the spot.

[0046] The processing residue 202 remaining in the processing tank 102 is collected and subjected to a predetermined treatment (e.g., heat treatment) so that it can be used as feed or fertilizer raw material. The larvae collected in the recovery tank 104 can be used as livestock feed after a predetermined treatment, or they can be provided as a clean food ingredient containing animal protein, or they can be processed into food.

[0047] Next, an example of how to use the larval recovery device 100 according to this embodiment will be described with reference to Figures 4(A) to 4(B) and 5.

[0048] Figure 4(A) shows the stage in which insect eggs 203 are inoculated. Organic waste 201 is put into the treatment tank 102 and leveled and spread to a uniform thickness on the bottom surface 1021. As mentioned above, livestock manure, food waste, agricultural waste, etc., can be used as organic waste 201. For example, okara, which is generated in large quantities during the tofu manufacturing process, can be used as organic waste 201.

[0049] Okara is a by-product of the tofu and soy milk manufacturing process, but less than 1% of it is used for food. The rest is used for animal feed and fertilizer, and discarded as industrial waste. Therefore, by using okara as organic waste 201 and processing it with the larva recovery device 100A, it is possible to make effective use of the resource.

[0050] The larval collection device 100 is installed in an environment suitable for the hatching of inoculated insect eggs 203 and the growth of larvae. For example, the larval collection device 100A is placed in a building where the temperature is adjusted to 20-50°C (preferably 25-40°C) and the humidity to 40-100% (preferably 50-80%). Since the ceiling of the treatment tank 102 is open, the internal conditions can be observed, and the moisture content and temperature of the organic waste 201 can be monitored to easily control the growth environment.

[0051] Figure 4(B) shows the stages of growth of larvae 204 hatched from insect eggs 203. The larvae 204 grow by peristalsis within a culture medium formed by organic waste 201, feeding on the organic waste 201. The moisture content of the organic waste 201 is adjusted to be suitable for the growth of the larvae 204. Adequate voids are necessary for the larvae 204 to peristalse within the organic waste 201. Therefore, the moisture content is adjusted to create appropriate voids within the organic waste 201. For example, when okara (soy pulp) is used as the organic waste 201, it is preferable to set the moisture content in the range of 60-80%. If the moisture content of the culture medium into which the organic waste 201 is accumulated is appropriate, appropriate voids will be formed as the larvae 204 feed on the organic waste 201 and move around. If the moisture content of the organic waste 201 is too low, the culture medium will harden, restricting the peristalsis of the larvae 204 and negatively affecting their growth. On the other hand, if the moisture content of the organic waste 201 is too high, the feeding ability of the larvae 204 will decrease, which is undesirable. By adjusting the moisture content of the organic waste 201 used in the larval recovery device 100A to an appropriate range, the growth environment for the eggs 203 and larvae 204 can be optimized, preventing the death of eggs 203 and larvae 204 due to environmental deterioration, and improving the hatching rate and survival rate.

[0052] The organic waste 201 ingested by the larvae 204 is enzymatically decomposed within the larvae 204's bodies and excreted as low-concentration organic decomposition products. The 1-day-old larvae hatched from the eggs 203 grow into 3-day-old larvae, pre-pupal metamorphosis, in about 4 to 7 days. The treatment tank 102 is left with the treated residue 202, which is the remaining organic waste 201.

[0053] Figure 5 shows the stage of separating the processed material residue 202 from the larvae 204. Larvae 204 (3-day-old larvae) that have grown in the processing tank 102 and reached their final instar attempt to move to a dry or dark environment due to their discrete behavior (peristaltic discrete behavior). At this time, the larvae 204 (3-day-old larvae) attempt to move to an external dry or dark environment by passing through the first through-hole 1024 located very close to the processed material residue 202. A separation tank 105 is placed below the processing tank 102. Figure 5 schematically shows how the larvae 204 (3-day-old larvae) that have passed through the first through-hole 1024 fall into the first separation tank 105A.

[0054] The first through-hole 1024 provided in the bottom surface 1021 of the processing tank 102 has a diameter only large enough for the larvae 204 to pass through. On the other hand, the organic waste 201 expands when it absorbs moisture. For these reasons, the processed material residue 202 is moist and therefore hardly falls through the first through-hole 1024, remaining in the processing tank 102. However, small amounts of the organic waste 201 and processed material residue 202 remaining in the culture medium adhere to the larvae, or fall through the first through-hole 1024 on their own.

[0055] Larvae that fall from the processing tank 102 are caught in the first separation tank 105A. Organic waste 201 and processing residue 202 that spill out of the processing tank 102 are also caught in the first separation tank 105A. Figure 5 schematically shows how the fallen material 2020 is mixed in the first separation tank 105A. Since the entire bottom surface 1051A of the first separation tank 105A does not have through holes, organic waste 201 and processing residue 202 that spill out of the processing tank 102 are prevented from falling directly into the tank below. Larvae 204 (3-day-old larvae) peristalse within the first separation tank 105A due to their discrete behavior. When peristalsis occurs, if there is a first through hole 1024, the larvae pass through the first through hole 1024 and peristalse toward the first region 1055A. Even if organic waste 201 or processing residue 202 is attached to the body of larva 204 (3-day-old larva), it is expected to fall off during this process.

[0056] Larvae 204 (3-day-old larvae) that have moved to the first area 1055A fall through the second through-hole 1054A and are contained in the second separation tank 105B. Directly below the first area 1055A is the bottom surface 1051B of the second separation tank 105B, which is a floor surface without through-holes. Therefore, larvae 204 (3-day-old larvae) that fall from the first separation tank 105A are caught in the second separation tank 105B. Similarly, even if organic waste 201 or processed material residue 202 falls from the first separation tank 105A, they are also caught in the second separation tank 105B.

[0057] Then, the larvae 204 (3-day-old larvae) that fall into the second isolation tank 105B similarly seek a dry environment and peristalse toward the second region 1055B. The larvae 204 (3-day-old larvae) that move to the second region 1055B fall through the third through-hole 1054B and are contained in the third isolation tank 105C. Directly below the second region 1055B is the bottom surface 1051C of the third isolation tank 105C, which is a floor surface without through-holes. Therefore, the larvae 204 (3-day-old larvae) that fall from the second isolation tank 105B are caught in the third isolation tank 105C.

[0058] The larvae 204 (3-day-old larvae) in the third isolation tank 105C peristalse toward the third region 1055C, fall through the fourth through-hole 1054C, and are ultimately collected in the recovery tank 104.

[0059] Furthermore, it is preferable that the diameters of the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C are approximately the same as the diameter of the first through-hole 1024, and that they have a diameter that allows larvae to pass through. In other words, it is preferable that the diameters of the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C are, for example, about 3 mm to 5 mm.

[0060] Thus, with the larval recovery device 100, larvae 204 can be reared using organic waste 201. When the larvae 204 are small, they do not fall through the first through-hole 1024, and before they grow and pupate, they fall through the first through-hole 1024 on their own. Therefore, the larvae 204 before pupation and the processed material residue 202 can be safely and inexpensively separated and recovered without manual labor. Since the first through-hole 1024 is provided in the bottom surface 1021 of the processing tank 102, larvae 204 that have reached the pupal metamorphosis stage (3-day-old larvae) can be guided in. As the distance the larvae 204 have to travel is shortened, the probability of the larvae 204 falling out increases, and recovery efficiency can be improved. In addition, since the bottom surface 1021 of the processing tank 102 is horizontal, the thickness of the organic waste 201 forming the culture medium can be made uniform, thus preventing uneven processing.

[0061] The larvae 204 are collected in the recovery tank 104 via a multi-stage separation tank 105. By positioning the separation tank 105 above the recovery tank 104, it is possible to prevent organic waste 201 or processed material residue 202 spilled from the treatment tank 102 from mixing into the recovery tank 104. Furthermore, by providing a multi-stage separation tank 105 between the treatment tank 102 and the recovery tank 104, a path is created for the larvae 204 to move by peristalsis, ensuring that the organic waste 201 or processed material residue 202 is reliably separated from the larvae 204.

[0062] Furthermore, the larval recovery device 100A according to this embodiment does not require a sloped structure in the processing tank 102 for rearing the larvae 204, and the recovery tank 104 can be placed directly below the processing tank 102, thus reducing the area required for installation and improving space efficiency. The larval recovery device 100 can be stored in multiple layers using shelves or the like, which improves the yield per unit area of ​​processed material residue 202 and larvae 204.

[0063] In this embodiment, the separation tank 105 is shown stacked in three layers, but there is no limit to the number of layers of separation tanks. As long as the areas where through holes are provided are arranged so that they do not overlap in the upper and lower layers, there is no limit to the number of layers that can be stacked.

[0064] [Second Embodiment] This embodiment shows a larval recovery device configuration in which the through-hole configuration in the separation tank differs from that of the first embodiment. In the following description, the differences from the first embodiment will be the main focus, and common descriptions will be omitted as appropriate.

[0065] Figures 6(A) to (C) show top views of the separation tanks 105 (first separation tank 105A, second separation tank 105B, and third separation tank 105C). In the configuration shown in Figures 6(A) to (C), the diameters of the second through-hole 1054A in the first separation tank 105A, the third through-hole 1054B in the second separation tank 105B, and the fourth through-hole 1054C in the third separation tank 105C are different from each other. That is, the diameter of the second through-hole 1054B is larger than the diameters of the third through-hole 1054B and the fourth through-hole 1054C, and the diameter of the fourth through-hole 1054C is smaller than the diameters of the second through-hole 1054A and the third through-hole 1054B. In other words, the through-holes in each of the separation tanks 105A, 105B, and 105C are arranged so that the diameter of the through-holes increases in the order of the fourth through-hole 1054C, the third through-hole 1054B, and the second through-hole 1054A.

[0066] In the configuration shown in Figures 6(A) to (C), for example, the diameters of the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C can be appropriately selected within the range of 3 mm to 10 mm, decreasing in the order of the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C.

[0067] By making the diameter of the through-holes 1054 in the separation tank 105 larger on the upper side (closer to the culture medium) and smaller on the lower side (closer to the recovery tank 104), larvae can be more easily dropped into the upper side (increasing the amount dropped), and the larvae can be reliably separated from the organic waste 201 or processed material residue 202 on the lower side.

[0068] Figures 7(A) to 7(C) show top views of the separation tanks 105 (first separation tank 105A, second separation tank 105B, and third separation tank 105C). In the configuration shown in Figures 7(A) to 7(C), the number of through-holes per unit area (the spacing between adjacent through-holes) differs for the second through-hole 1054A in the first separation tank 105A, the third through-hole 1054B in the second separation tank 105B, and the fourth through-hole 1054C in the third separation tank 105C. In other words, the through-holes in each separation tank 105A, 105B, and 105C are arranged so that the density of through-holes increases in the order of fourth through-hole 1054C, third through-hole 1054B, and second through-hole 1054A.

[0069] In the configuration shown in Figures 7(A) to (C), for example, the spacing between the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C can be in the range of 3 mm to 30 mm, increasing in the order of the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C. Furthermore, the diameter of the fourth through-hole 1054C can be made larger compared to the diameters of the second through-hole 1054A and the third through-hole 1054B.

[0070] As shown in Figures 7(A) to (C), by making the spacing of the through-holes 1054 in the separation tank 105 smaller (closer to the culture medium) on the upper side (closer to the recovery tank 104) and larger (wider) on the lower side (closer to the recovery tank 104), it is possible to make it easier for larvae to fall in on the upper side (increasing the amount that falls in) and to reliably separate the larvae from the organic waste 201 or processed material residue 202 on the lower side. Furthermore, by making the diameter of the fourth through-hole 1054C larger than the diameter of the second through-hole 1054A and the third through-hole 1054B, it is possible to increase the amount of larvae that fall in on the lower side while reliably separating the larvae from the organic waste 201 or processed material residue 202.

[0071] The larval recovery device according to this embodiment is the same as that of the first embodiment, except that the configuration of the separation tank 105 is as shown in Figures 6(A) to (C) or as shown in Figures 7(A) to (C), and the same effects can be obtained. In addition, the configuration of the through-holes shown in this embodiment can be appropriately combined with the arrangement of the areas where the through-holes are provided as shown in Figures 2(A) to (C).

[0072] [Third Embodiment] This embodiment shows a configuration of the separation tank and recovery tank that differs from the larval recovery device shown in the first embodiment. In the following description, we will focus on the parts that differ from the first embodiment, and common components will be omitted as appropriate.

[0073] Figure 8 shows a side view of the larva recovery device 100 according to this embodiment. Similar to the first embodiment, the larva recovery device 100 has a configuration in which a processing tank 102, a separation tank 105, and a recovery tank 104 are stacked on top of each other.

[0074] Figure 8 shows a structure in which the separation tank 105 is stacked, consisting of a first separation tank 105A, a second separation tank 105B, and a third separation tank 105C, similar to the first embodiment. The first separation tank 105A, the second separation tank 105B, the third separation tank 105C, and the recovery tank 104 in this embodiment have ventilation openings 1044. The ventilation openings 1044 are provided at the top of the first separation tank 105A, the second separation tank 105B, the third separation tank 105C, and the recovery tank 104. The ventilation openings 1044 are provided at least in one location, preferably two or more locations, in the first separation tank 105A, the second separation tank 105B, the third separation tank 105C, and the recovery tank 104, so as to form a gap between them and the upper tank. For example, it is preferable that the ventilation openings 1044 be provided in at least two locations in the first separation tank 105A, the second separation tank 105B, the third separation tank 105C, and the recovery tank 104, so that an air inlet and an air outlet are formed.

[0075] The ventilation openings 1044 may be formed by cutting out the upper parts of the first separation tank 105A, the second separation tank 105B, the third separation tank 105C, and the recovery tank 104, or by providing holes that penetrate the upper parts. By providing the ventilation openings 1044, a flow path can be formed between the upper side of each stacked tank, allowing outside air to flow in and the air inside the tank to flow out. In other words, the ventilation openings 1044 can form a flow path for air to flow through the space at the boundary of each tank. With this configuration, an area for air to flow can be formed in the space below the processing tank 102, the first separation tank 105A, the second separation tank 105B, and the third separation tank 105C, creating a dry space due to the drying process. As a result, it becomes easier to guide the 3-day-old larvae that have entered the pupal metamorphosis stage into the first through-hole 1024 of the processing tank 102, and the second through-hole 1054A, third through-hole 1054B, and fourth through-hole 1054C of the separation tank 105, thereby improving the efficiency of larval recovery 204.

[0076] Although not shown in the diagram, the ventilation opening 1044 may be formed by providing a spacer rather than cutting out or drilling a hole in the top of the tank. With this configuration, the width of the ventilation opening 1044 can be adjusted by changing the height of the spacer, and the amount of air flowing between each tank can be adjusted.

[0077] The airflow through the ventilation opening 1044 may be due to natural wind, but it may also be forcibly supplied using a blower 106 as shown in Figure 8. Using the blower 106 makes it easy to adjust the amount of air supplied, and allows for active control of the dry atmosphere formed near the lower side of the first through-hole 1024, the second through-hole 1054A, the third through-hole 1054B, and the fourth through-hole 1054C.

[0078] According to the configuration shown in this embodiment, the movement of larvae 204 (3-day-old larvae) in the processing tank 102, as well as in the first separation tank 105A, the second separation tank 105B, and the third separation tank 105C can be actively promoted. Furthermore, when ventilation is not necessary, a sealing plate or sealing door (not shown) that closes the ventilation opening 1044 may be provided, thereby preventing the drying of the organic waste 201. The larva recovery device 100 of this embodiment is the same as that shown in the first embodiment, except that the ventilation opening 1044 is provided, and can achieve the same effects. Furthermore, the configuration of the separation tanks shown in the second embodiment can be applied to the configuration of the larva recovery device 100 of this embodiment.

[0079] [Fourth Embodiment] This embodiment shows a configuration of the treatment tank and separation tank that differs from the larval recovery device shown in the first embodiment. In the following description, we will focus on the differences from the first embodiment, and common components will be omitted as appropriate.

[0080] Figures 9(A) and (B) show the configuration of the processing tank 102 in this embodiment. In Figure 9, (A) is a plan view of the processing tank 102, and (B) is a cross-sectional view of the processing tank 102. As shown in Figures 9(A) and (B), the bottom surface of the processing tank 102 has a structure in which a fabric 1023 is stretched over it. The fabric 1023 may be stretched directly over the processing tank 102. Alternatively, as shown in the figure, the fabric 1023 may be stretched over a frame 1025 and dropped into the bottom of the processing tank 102, and may be provided in a detachable manner.

[0081] Figures 10(A) and (B) show the configuration of the separation tank 105 in this embodiment. In Figure 10, (A) is a plan view of the first separation tank 105A, and (B) is a cross-sectional view of the first separation tank 105A, the second separation tank 105B, and the third separation tank 105C. Similar to the processing tank 102, the first region 1055A of the first separation tank 105A, the second region 1055B of the second separation tank 105B, and the third region 1055C of the third separation tank 105C are formed of fabric 1053. The fabric 1053 may be stretched directly over the bottom surface of each separation tank, or it may be stretched over a frame 1058 and detachably provided.

[0082] The fabric 1023 is breathable. Therefore, it is easy to manage the moisture content of the organic waste 201 placed in the treatment tank 102. For example, if the moisture content of the organic waste 201 is excessive, it can be dried to an appropriate level by passing dry air through it.

[0083] The fabrics 1023 and 1053 are stretched over the frames 1025 and 1058 and are detachably installed, so that the fabrics 1023 and 1053 can be easily replaced when they become old. The fabrics forming the fabrics 1023 and 1053 may be natural fibers, chemical fibers, or metallic fibers. Alternatively, a mesh may be used instead of the fabric 1023.

[0084] The fabrics 1023 and 1053 are provided with holes 1034 and 1059 through which the larvae can pass when pupating. Alternatively, by using fabrics with a coarse weave for 1023 and 1053, the weave itself can be used as a substitute for through holes. With this configuration, larvae that have reached the pupal metamorphosis stage can be dropped from the processing tank 102 and separated into the collection tank 104 by passing them through the separation tank 105, similar to the first embodiment.

[0085] The larval recovery device according to this embodiment is the same as that of the first embodiment, except for the difference in the configuration of the bottoms of the processing tank 102 and the separation tank 105, and can obtain the same effects and advantages. The configuration of the processing tank 102 covered with fabric 1023 and the separation tank 105 covered with fabric 1053 shown in this embodiment can be appropriately combined with the larval recovery devices shown in the second and third embodiments.

[0086] [Fifth Embodiment] This embodiment describes a larval recovery device having a different configuration of the treatment tank from the larval recovery devices shown in the first to third embodiments. In the following description, we will focus on the differences from the first to third embodiments, and common components will be omitted as appropriate.

[0087] Figures 11(A) and (B) show the main configuration of the larva collection device 100 according to this embodiment. In Figure 11, (A) is a plan view of the larva collection device 100, and (B) is a cross-sectional view.

[0088] The larval collection device 100 of this embodiment has a processing tank 103, which is made of a bag-shaped fabric. The processing tank 103 is supported by a frame 1043 and installed on top of a separation tank 105 (first separation tank 105A). The frame 1043 is installed on top of the separation tank 105 (first separation tank 105A) and has protrusions to support the processing tank 103. Although not shown, a frame may also be provided to span diagonally or across opposite sides of the frame 1043 to support the processing tank 103.

[0089] The processing tank 103 is provided with an opening 1032 at the top or side to allow the organic waste 201 to be loaded and unloaded, and to prevent it from overflowing after being stored in the bag. The opening 1032 is, for example, made of a fastener. The bag-shaped fabric that makes up the processing tank 103 may also have its top closed by being tied in a drawstring manner.

[0090] When the processing tank 103 is installed by the frame 1043, a hole 1034 is provided on the lower side facing the separation tank 105, through which the larvae can pass when pupating. With this configuration, larvae that have reached the pupal metamorphosis stage can be separated into the recovery tank 104, similar to the first embodiment. Alternatively, the hole 1034 in the processing tank 103 may be omitted by using a fabric with a coarse weave that allows the larvae to pass through. Since the processing tank 103 is made of fabric, it is breathable, making it easy to manage the moisture content of the organic waste 201. For example, if the moisture content of the organic waste 201 is excessive, it can be dried appropriately by passing dry air through it. The fabric forming the processing tank 103 may be made of natural fibers or synthetic fibers.

[0091] The larval recovery apparatus according to this embodiment is the same as that in the first embodiment, except for the configuration of the treatment tank 103, and can obtain the same effects and advantages. The configuration of the treatment tank 103 shown in this embodiment can be appropriately combined with the larval recovery apparatus shown in the second, third, and fourth embodiments.

[0092] [Sixth Embodiment] This embodiment describes a larva recovery device having a configuration different from that of the larva recovery devices shown in the first to fifth embodiments. In the following description, we will focus on the parts that differ from the first to fifth embodiments, and common components will be omitted as appropriate.

[0093] The larval recovery device may consist of a separation tank 105 and a recovery tank 104. That is, the larval recovery device of this embodiment has a configuration in which the processing tank 102 is omitted from the larval recovery device 100 shown in the first to fourth embodiments. The culture medium does not have to be integrated with the larval recovery device, and larvae hatched from eggs (1-day-old larvae) are reared using other equipment or devices. Then, larvae that reach the pupal metamorphosis stage in about 4 to 7 days (3-day-old larvae) are introduced into the larval recovery device of this embodiment. Specifically, organic waste containing 3-day-old larvae is supplied to the separation tank 105. From there, it is the same as in the first to fourth embodiments, and the larvae can be separated from the organic waste by the separation tank 105 and recovered in the recovery tank 104.

[0094] [Seventh Embodiment] This embodiment describes a method for shortening the larval recovery time in the larval recovery device shown in the first to sixth embodiments. Here, the larval recovery device of the first embodiment will be used for the explanation, but it can be applied to the second to sixth embodiments as appropriate.

[0095] The larval recovery device 100 of this embodiment, shown in Figure 12, includes a processing tank 102, a separation tank 105, a recovery tank 104, and a camera 108 that allows observation of the inside of the recovery tank 104. Furthermore, the larval recovery device 100 of this embodiment has a configuration in which the processing tank 102, separation tank 105, and recovery tank 104 are detachable from the main body of the device, and has a moving mechanism 112 for this purpose. In addition, the larval recovery device 100 of this embodiment has a control device 110 that works in conjunction with the camera 108 to control the operation of the moving mechanism 112.

[0096] The larval recovery device 100 of this embodiment dynamically changes the arrangement of the treatment tank 102 and the separation tank 105 in accordance with the changes (growth) and movements of the larvae, thereby separating and recovering the larvae from the organic waste 201 or the processing residue 202. During the stage when the larvae are growing in the culture medium, the camera 108 observes the changes in the larvae in the treatment tank 102. Larvae that are undergoing pupal metamorphosis in the organic waste 201 (3-day-old larvae) will attempt to move from the culture medium of the organic waste 201 containing moisture (humidity) to a dark area due to their peristaltic discrete behavior, and the peristaltic movement of the larvae can be observed. The control device 110 has an image processing unit and has the function of identifying larvae from other substances (organic waste 201, etc.) through image processing. Such a function may be realized by artificial intelligence. Then, when the control device 110 recognizes from the image of the camera 108 that the larvae have fallen from the through-hole of the processing tank 102 into the separation tank 105 and the number of larvae in the processing tank 102 has decreased, the control device 110 controls the moving mechanism 112 to move the processing tank 102 away from the main body of the device, exposing the first separation tank 105A.

[0097] Figure 13 shows the state after the processing tank 102 has been moved from the larval collection device 100. Larvae have a tendency to move to dark areas. As the processing tank 102 is moved and the first separation tank 105A becomes the uppermost stage, the top surface of the separation tank 105A is exposed to the outside and becomes brighter, causing the larvae to move towards the through-hole, fall through the through-hole, and move to the second separation tank 105B, which is a dark area. Camera 108 takes pictures of the state of the first separation tank 105A, which is now the uppermost stage, and the control device 110 monitors the number of larvae.

[0098] When the control device 110 recognizes from the image on the camera 108 that the number of larvae in the first treatment tank 105A has decreased as the larvae fall from the first separation tank 105A to the second separation tank 105A, the control device 110 controls the moving mechanism 112 to move the first separation tank 105A away from the main body of the device, exposing the second separation tank 105A. Subsequently, the second separation tank 105B and the third separation tank 105C are moved away from the main body of the device through a similar procedure, leaving the recovery tank 104. The recovery tank 104 contains larvae that have moved from the upper separation tank 105 in search of a darker place.

[0099] In this way, the camera 108 observes the number and movement of larvae in the uppermost section of the larval collection device 100. When the number of larvae decreases as they fall to the lower section, the camera 108's image is used to recognize this, and the uppermost separation tank is moved by the moving mechanism 112 to expose the destination of the larvae. By repeating this process, the time it takes for the larvae to move and fall can be shortened, enabling larval collection in a short amount of time. [Industrial applicability]

[0100] The larval recovery devices shown in the first to seventh embodiments allow larvae of insects belonging to the order Diptera to feed on organic waste such as food waste and agricultural waste, and the processed waste can be used as a raw material for compost or fertilizer. In addition, the larvae separated and recovered from the processed waste before pupation, or the pupae after pupation, can be used as feed for livestock, farmed fish, or pets, or as an insect-derived food raw material.

[0101] The larval recovery devices shown in the first to seventh embodiments have a simple configuration and do not require a large installation area. Therefore, by arranging them in multiple levels within a building, large amounts of organic waste can be processed, and consequently, large amounts of larvae can be recovered. Insects belonging to the order Diptera, such as houseflies, have an egg stage of about one day and a larval stage of about 4 to 7 days. As a result, the period from egg inoculation to larval recovery is short, allowing a series of processes such as egg inoculation, larval rearing (processing of organic waste), and separation and recovery of processed material residue and larvae to be carried out in a short period of time, thereby increasing productivity. [Explanation of Symbols]

[0102] 100: Larva collection device, 102: Processing tank, 1021: Bottom surface, 1022: Wall surface, 1023: Fabric, 1024: First through hole, 1025: Frame, 103: Processing tank, 1032: Opening / closing port, 1034: Hole, 104: Collection tank, 1041: Bottom surface, 1042: Wall surface, 1043: Frame body, 1044: Ventilation port, 105: Separation tank, 105A: First separation tank, 105B: Second separation tank, 105C: Third separation tank, 1051A: Bottom surface, 1051B: Bottom surface, 1051C: Bottom surface, 1052: Wall surface, 1 053: Fabric, 1054A: Second through-hole, 1054B: Third through-hole, 1054C: Fourth through-hole, 1055A: First area, 1055B: Second area, 1055C: Third area, 1056: Barrier, 1057A: Offset area, 1057B: Offset area, 1058: Frame, 1059: Hole, 106: Blower, 108: Camera, 110: Control device, 112: Moving mechanism, 201: Organic waste, 202: Processed material residue, 2020: Fallen object, 203: Egg, 204: Larva

Claims

1. A collection tank for collecting larvae raised in a culture medium, Multiple separation tanks are arranged on top of the aforementioned recovery tank, It has, The aforementioned plurality of separation tanks are A first separation tank having a plurality of first through-holes through which the larvae can pass, in a first region which is part of the bottom surface, A second separation tank having a second region which is part of the bottom surface, having a plurality of second through-holes through which the larvae can pass, Includes, A larval collection device for insects belonging to the order Diptera, characterized in that the first region and the second region are arranged so as not to overlap in a plan view.

2. The diameter of the first through hole and the second through hole is 3 mm or more and 5 mm or less. The larval collection device for insects belonging to the order Diptera according to claim 1, wherein the spacing between the plurality of first through holes and the spacing between the plurality of second through holes are 3 mm or more and 15 mm or less.

3. A processing tank equipped with a culture medium for rearing the larvae of insects belonging to the order Diptera, A collection tank is placed on top of the processing tank and is used to collect the larvae that have been reared in the culture medium, Multiple separation tanks are arranged in stacks between the processing tank and the recovery tank, It has, The processing tank has a plurality of first through holes in its bottom surface through which the larvae can pass. The aforementioned plurality of separation tanks are A first separation tank having a plurality of second through-holes through which the larvae can pass, in a first region which is part of the bottom surface, A second separation tank having a second region which is part of the bottom surface, having a plurality of third through-holes through which the larvae can pass, Includes, A larval collection device for insects belonging to the order Diptera, characterized in that the first region and the second region are arranged so as not to overlap in a plan view.

4. The larval collection device for insects belonging to the order Diptera according to claim 3, wherein the diameters of the first through hole, the second through hole, and the third through hole are 3 mm or more and 5 mm or less.

5. A larval collection device for insects belonging to the order Diptera according to any one of claims 1 to 4, comprising a barrier erected from the bottom surface of the second separation tank, wherein the barrier is provided to conceal areas of the bottom surface of the second separation tank other than the second region and the region overlapping with the first region.

6. A larval collection device for insects belonging to the order Diptera according to any one of claims 1 to 4, wherein, in a plan view, there is an offset region between the first region and the second region.

7. The plurality of separation tanks and the recovery tank are provided with ventilation openings at their upper ends, the larval recovery device for insects belonging to the order Diptera according to any one of claims 1 to 6.

8. The insect belonging to the order Diptera according to claim 7, further comprising a blower that sends air to the aforementioned vent. Larva collection device.

9. A larval collection device for insects belonging to the order Diptera according to any one of claims 1 to 8, wherein the first region and the second region are formed of a cloth, and the weave of the cloth is coarse enough for the larva to pass through.

Images