Patent Application
20140123902
The present invention relates to a method for producing organic fertilizer from excreta of livestock by using Musca domestica (housefly) larvae.
In livestock facilities such as pig firming and diary firming, excreta are discharged every day and an amount of excreta is generally proportional to a breeding number of animals. Usually, the excreta is composted by means of microorganisms
Disposal of excreta by microorganisms, however, consume too long time because of higher percentage of liquid components in the excreta. In some areas, the livestock excreta generated in large quantities are left on ground without treatment, resulting in contamination of ground water, which has become a cause of social problems.
Therefore, how to dispose of excreta is a problem to be solved today. In particular, it is not allowed any more to damp unsanitary excreta which give off a bad smell due to the recent severe regulation for environmental protection.
An amount of excreta of livestock is increasing along with expansion of the livestock scale but it is not easy to dispose of excreta generated daily in a large quantity efficiently in a short period of time. Therefore, disposal of livestock excreta is a heavy burden for livestock farmers.
Under such situation, it was proposed to use an insect bio-processing system for processing animal excreta so as to reduce the above burden (see Patent Document 1).
The insects bio-processing system disclosed in Patent Document 1 comprises a means for conveying sequentially processing-containers on which animal excreta are placed, a means for preying animal excreta onto an empty processing-container conveyed successively, a means to depositing eggs or larvae of housefly into unfermented excreta in the processing containers, a means for maturing excreta for a require duration in the processing containers stacked in multiple stages, a means to collect larvae or pupa metamorphosed from the larvae of housefly crawling out of the processing-containers, and a means for recovering finished or matured excreta from the processing-container which is advanced successively.
In this insect bio-processing system, reduction of harm or detoxification of excreta can be realized by preying or feeding animal excreta to housefly.
Patent Document 1: JP-A1-2002-11440
Reduction of harm or detoxification of excreta is done by preying or feeding animal excreta to housefly can be realized in this insect bio-processing system disclosed in Patent Document 1, however, a treatment or handling for producing organic fertilizer from housefly larvae must be carried out in a processing chamber whose temperature and humidity are adjustable. Still more, all of deposition of housefly eggs onto excreta placed in a container, of hatching of eggs, of growing of larvae, and loading and unloading of the containers must be done manually.
Moreover, larvae crawling out of the containers must be handled manually, since this method utilizes such a habit of housefly that larvae come out a medium to become pupae after larvae grow in certain level. However, working environment in the processing chamber to carry out the above works is extremely poor and is not amenable to manual labor, because the work environment is filled with odor of excreta and grown larvae (maggots) are crawling all around.
Still moreover, there is another problem. An amount of prey or feed processed by the larvae of houseflies increases explosively in a week when there is enough breeding volume and food. On the contrary, if such enough breeding volume and food are not available, an amount of organic fertilizer base material which is produced within the bodies of larvae by enzymatic decomposition and excreted out of larvae decrease and the growth of larvae become also slow.
The present invention was done in view of the above problems of prior arts. In the present invention, disposal of animal excreta such as pig feces effected by housefly larvae can be done under such condition that a sufficient nurturing area for larvae is available, that a sufficient amount of prey or feed can be supplied to larvae to accelerate the growth thereof, that an amount of excrete produced within the body of larva by enzymatic decomposition of livestock excreta can be increased and that manual handling operation in the processing storage room is not necessary.
Thus, the present invention provides a system which can produce organic fertilizer from animal excreta efficiently with less labor.
In order to solve the above problems, an invention defined in claim 1 corresponding to Examples, in particular Example 1, is an organic fertilizer producing system for producing organic fertilizer from excreta of livestock or domestic animal by using larvae of Musca domestica (housefly), characterized in
that a first nurturing-processing storage unit for nurturing or growing larvae hatched from eggs is provided, that a plurality of second nurturing-processing storage units is arranged below the first nurturing-processing storage unit, that the first nurturing-processing storage unit has a dropping part, so that grown larvae drop onto the second nurturing-processing storage units covered with excreta of livestock, by utilizing such a behavior of larvae that they crawl out of the first nurturing-processing storage unit,
that a plurality of third nurturing-processing storage units are arranged below the second nurturing-processing storage units in the same way as above, so that grown larvae drop onto the third nurturing-processing storage units covered with excreta of livestock,
that the above processing is reaped for required several times until the final nurturing-processing storage unit, wherein the excreta of livestock are decomposed with enzyme within larvae bodies during larvae are nurtured in each nurturing-processing storage unit, while the larvae excrete or produce an organic fertilizer base material,
that a collecting section for collecting the organic fertilizer base material produced is provided, and
that a larvae collecting section for collecting grown larvae crawling out of the final nurturing-processing storage unit is provided, the resulting collected larvae as well as the organic fertilizer base material produced being carried out of the system.
An invention defined in claim 2 corresponds to Examples 1 to 4, the organic fertilizer producing system according to claim 1, characterized in that each of the nurturing-processing storage comprises a dropping part and a receiving part for larvae on a fixed frame, and a bottom part on which a flat body is placed movably.
An invention defined in claim 3 corresponds mainly to Example 5, the organic fertilizer producing system according to claim 1, characterized in that each of the nurturing-processing storage unit comprises a series of movable trays each having a bottom part and a dropping part and a receiving part for the larvae, the trays being circulated by a conveyor.
An invention defined in claim 4 corresponds mainly to Examples 1 and 4, the organic fertilizer producing system according to any one of claims 1 to 3, characterized in that each of the nurturing-processing storage unit has a receiving part located at a position corresponding to the dropping part of an upper nurturing-processing storage unit, the receiving part comprising a flat body in a form of a projection which projects outward and having a width equal to a width of the dropping part divided by a predetermined number.
An invention defined in claim 5 corresponds mainly to Example 2, the organic fertilizer producing system according to any one of claims 1 to 4, characterized in that each of the nurturing-processing storage unit has a receiving part located at a position corresponding to the dropping part of an upper nurturing-processing storage unit, the receiving part comprising an edged roller having edges on its surface for hurting dropping larvae and having a width equal to a width of the dropping part divided by a predetermined number.
An invention defined in claim 6 corresponds mainly to Example 1, the organic fertilizer producing system according to any one of claims 1 to 5, characterized in that the larvae collecting section has an imago extraction part for extracting a part of imagoes or a part of pupas grown, so that imagoes of houseflies extracted in the imago extraction part and are is guided though a duct to an egg depositing-hatching unit located above the first nurturing-processing storage unit.
An invention defined in claim 7 corresponds mainly to Example 1, the organic fertilizer producing system according to claim 6, characterized in that a plurality of rotary chambers are arranged in the egg depositing-hatching unit and a prey is fed into one of the chambers whose opening is directed upwards, while the prey is irradiated with ultraviolet rays, so that imagoes of the houseflies lay eggs in the prey, in that the rotary chambers are revolved gradually for a predetermined time period, during which the eggs grow into imagoes and the resulting imagoes fall onto the first nurturing-processing storage unit when the opening of the rotary chamber is directed downwards.
An invention defined in claim 8 corresponds mainly to Example 1, the organic fertilizer producing system any one of claims 1 to 7, characterized in that the larvae discharged out of the last nurturing-processing storage unit are sacrificed and processed as a prey.
According to the invention of an organic fertilizer production system defined in claims 1 to 4, the organic fertilizer base material is produced inside the bodies of larvae of housefly by enzymatic decomposition of excreta of livestock and is excreted out of the larval. Therefore, there is no consumption of fuel which is necessary in case of incineration and an impact on the environment can be reduced, because there is no emotion of carbon dioxide. Still more, unlike the conventional bacterial detoxification, emotion of long-lasting bad smell can be reduced or eliminated and there is no propagation or breeding of pathogens. In the system according to the present invention, excreta are disposed and handled safely by utilizing a preying habit of larvae of houseflies.
Still more, in the system according to the present invention, larvae of houseflies are nourished and nurtured in an enough breeding area and volume with sufficient food. Therefore, the preying habit of larvae of houseflies can be improved and a large amount of excreta of livestock such as swine dung can be changed to organic fertilizer efficiently in a shorter period of time. In particular, in the system according to the present invention, the nurturing-processing storage unit is divided or increased gradually with the progress of growth of larvae, so that prey can be distributed uniformly or evenly.
In addition, the organic fertilizer base material produced by the system according to the present invention contains abundant chitosan. Such organic fertilizer produced by the system according to the present invention can be used in preparation of organic fertilizer which can improve soil and the antibacterial activity, promote growth of plant, prevent disease of plant, and improve the quality of fruits.
Finally, manual labor in the nurturing-processing storage unit can be reduced so that the organic fertilizer can be produced efficiently with less effort.
According to the invention of an organic fertilizer production system defined in claim 5, in addition to the advantages described above, the edges on roller inflect an abrasion on the skin of larvae of houseflies and the resulting wounded larvae produce much antimicrobial peptides.
According to the invention of an organic fertilizer production system defined in claim 6, in addition to the advantages described above, a part of larvae is grown to imagoes of houseflies which lay eggs, so that reproduction of larvae can be reproduced in the system with no introduction of additional larvae from outside to realize a recycling system of larvae.
According to the invention of an organic fertilizer production system defined in claim 7, in addition to the advantages described in claim 5, imagoes of houseflies are guided or induced to a predetermined egg-laying site to improve the efficiency in egg recycling.
According to the invention of an organic fertilizer production system of claim 8, in addition to the advantages described in claims 1 to 7, imagoes of houseflies recovered from the final nurturing-processing storage unit are utilized as excellent prey.
Now, we will describe a general concept of an organic fertilizer production system according to the present invention with reference to
The organic fertilizer production system of
1: [Prey preparation step],
2: [Prey supply step],
3: [Egg depositing-hatching step],
4: [Larvae nurturing step],
5: [Larvae/fertilizer separation step],
6: [Organic fertilizer making step],
7: [Larvae sacrificing step],
8: [Animal food processing step], and
9: [Recycling step]
Outline of each step will be explained below.
This prey preparation step is a step for preparing a prey or feed for larvae of Musca domestica (housefly) (worms or maggots). The prey is prepared mainly from pig excreta having high nutritional value and is added with chaff, soybean curd refuse, water, rise bran and entrails of pig. In practice, 20 to 40 percents of soybean curd refuse and chaff (about 9:1) is added to pig excreta (or with chicken excreta), the water content is adjusted and mixed together. Food scraps also can be added to the excreta of livestock, so that the food residues are putrefied in excreta to prepare the prey. In fact, food residues are putrefied in excreta to prepare and are changed to prey, so that the system according to the present invention can dispose of a huge volume of human food residues (garbage) together with excreta of livestock.
In the prey supply step, a predetermined quantity of prey is fed through hoppers which will be explained later in
In the egg depositing-hatching step, adult larvae are induced into an egg depositing-hatching unit. Housefly can lay eggs 4 days after it becomes an imago but a number of eggs decrease after 14 days. Therefore, the biting medium in the egg depositing-hatching unit is marked with skin milk and sake lees which housefly likes and is irradiated by ultraviolet light to stimulate egg-laying, so that larvae lay eggs at a fixed place. The eggs hatch about one day after egg-laying. The first instar larva is dropped onto the uppermost first nurturing-processing storage unit.
In the larvae nurturing step, hatched larvae are nurtured in the dark larvae nurturing room 2. The second instar larvae after the first ecdysis are also nurtured in dark or in twilight. The third instar larvae after the second ecdysis but before metamorphosis to pupae are nurtured under light for about 6 days.
Such a habit of larvae of houseflies that they advance themselves for prey is utilized in the present invention. In fact, larvae of houseflies fall themselves down onto next nurturing-processing storage unit and nurtured therein. Then, larvae fall themselves down again to divided next nurturing-processing storage units and nurtured therein.
In case of Example 2, the edges on roller inflect an abrasion on the skin of larvae of houseflies (maggot) when they fall down onto next nurturing-processing storage unit, so that the wounded larvae produce much antimicrobial peptides caused by healing power.
In the larvae/fertilizer separation step, a habit of vermiculation and scattering at a stage of pupa metamorphosis is utilized. The larvae fall down onto a collecting container and are discharged as animal food (E) of high quality. Excretion which is left after the larvae eat excreta of livestock on the nurturing-processing storage unit is conveyed out as organic fertilizer base material.
The separation of the fertilizer from larvae starts from 4th day to 7th day after the egg-deposition. The separation of the fertilizer from larvae can be effected surely by nurturing the third instar larvae under light by utilizing their phototactic behavior at the stage of metamorphosis to pupae.
The organic fertilizer base material is produced during the organic fertilizer making step according to the present invention. In fact, from 65% to 90% of prey is eaten by larvae and remaining prey of from 10% to 35% is fermented. The organic fertilizer base material may be mixed with corpse of larvae of housefly rich in chitosan and cast-off skin of housefly.
In the larvae sacrificing step, a group of larvae collected in the collecting container and separated from the organic fertilizer base material is sacrificed by means of steaming, boiling, incineration or the like 4 days after egg-deposition onto prey. Larvae of different insects that may creep in can be excluded in this stage.
In the prey processing step, larvae fall themselves into the collecting container 5 days after egg-deposition onto prey are processed into the animal food (E) like “Trops” (commercial name).
In the recycle stage, a part of larvae group is extracted 5 days after egg-deposition onto prey. Then, larvae extracted are brawn to imagoes. The resulting houseflies are induced by light and smell into the egg depositing-hatching unit in [3: egg depositing-hatching step] through the duct due to their habit of phototaxis. The imagoes deposit eggs into prey. Thus, eggs of next generation are obtained or recycled in the system and hence no supply of additional eggs is necessary.
Now, we will describe details of the above steps in Example 1 according to the present invention with reference to
As stated above, in the system according to the present invention, larvae of housefly can be nurtured in enough larger nurturing volume (area) and sufficient prey can be supplied.
Such sufficiently larger breeding volume (area) and enough prey for larvae were not available in case of the conventional method in which the larvae are nurtured in the same tray from first to last.
In case of the preset invention, as is shown in
An installation for producing organic fertilizer shown in
The nurturing-processing section (1A) is covered by a larvae nurturing room (2) so that the temperature in a range between 25° C. and 30° C. is maintained and humidity in a range between 50% and 70% is maintained in a nurturing environment. An egg depositing-hatching unit (3) is positioned at the top of the larvae nurturing room (2).
An egg depositing-hatching unit (3) has four rotary rollers (31) whose shafts are arranged horizontally as shown in
At a position shown in
In fact, houseflies start egg production 4 days after they grow to adult, and the egg production rate will be reduced in 14 days. Therefore, a predetermined location or the opening (33) is marked during this period to attract houseflies and to induce their egg-laying.
A perching net (37) is hung up near a ceiling of the egg depositing-hatching unit (3) so that houseflies can rest during fee flying time other than egg-deposition time.
Eggs are laid in the first chamber (311) as an egg-laying room shown in
In summary, the egg depositing-hatching unit (3) in the egg depositing-hatching section has a plurality of first to fourth rotatable chambers, a prey (B) is fed into a chamber whose opening is directed upwards, and the prey (B) is irradiated with ultraviolet light to attract imagoes of houseflies and to induce their egg-deposition. These first to fourth chambers are turned gradually or stepwise, during which the eggs grow to larvae. The resulting larvae fall through the opening directed downwards onto the first nurturing-processing storage unit.
The first nurturing-processing storage unit (41) in the nurturing-processing sections 1A is an uppermost one of nurturing-processing storage units (4) which are sucked in (31) multi-levels and arranged in 4 rows.
Now, the entirety of the nurturing-processing storage units (4) will be explained with refereeing to
a) is a development of the nurturing-processing storage unit (4) of
In more precisely,
1: First stag nurturing-processing storage unit (41).
In
Now, we will be described the nurturing-processing storage unit much in details with reference to
Third stage nurturing-processing storage unit (43) (4-1) has a bottom part (4a) and opposite side walls (4b) (4c) and has a substantially U-shaped cross section. The nurturing-processing storage unit (4) is secured to a frame of the larvae nurturing room (2) but can be, of course, supported movably on wheels if necessary.
A notched part (4d) is formed on one (4b) of the side walls (a wall on a front side in
The flat body 5 (53) arranged on the bottom part (4a) in
Another notched part (4f) is formed on another (4c) of the side walls (a wall on a backward in
The other nurturing-processing storage units (4) also have the same structure as those explained for the third stage nurturing-processing storage unit (43). In fact, as can be seen from the development view of
Namely, start from the first one nurturing-processing storage unit (41), a number of the nurturing-processing storage units is multiplied by two (“2”) and increased finally to seventeen units in the final nurturing-processing storage units (45).
In this case, as shown in
This structure of the present invention is advantageous to save a space, although stacked nurturing-processing storage units (4) become a tall tower. Alternatively, a lower stage for example the second stage can be constructed by two parallel rows of the nurturing-processing storage units. In this case, freedom in designing of the width of the dropping part increase and a height of the tower can be reduced to a half but an area occupied by the nurturing-processing storage units (4) becomes double.
Thus, a plurality of receiving parts are formed on a lower nurturing-processing storage unit (4) for receiving falling larvae from an upper nurturing-processing storage unit (4), a width of the receiving part being equal to a value which is a corresponding width (4f) of the dropping part of the upper nurturing-processing storage unit (4) divided by a number of lower nurturing-processing storage units (4). Enough nurturing volume for larvae is assured by increasing the nurturing-processing storage units (4) to a predetermined number, and hence the nurturing-processing storage unit can be supplied with sufficient amount of prey, so that eating habit of larvae can be promoted.
In this Example, the system according to the present invention is designed such that a period from egg-laying to a time when larvae fall from the final nurturing-processing storage unit (45) will be about 6 to 7 days. Generally, the system according to the present invention can be realized by designing a volume of each nurturing-processing storage unit (4) through which larvae travel and/or by setting the number of nurturing-processing storage unit (4) and the number of their stages.
Here, movement of larvae in the nurturing-processing storage unit (4) as well as their flow is explained in much in details. When the four rotary rollers (31) in the egg depositing-hatching unit (3) rotate, hatched larvae (A) of houseflies fall from each chamber (311-3149 of the rotary roller (31) onto the first nurturing-processing storage unit storage unit (41). In case of the first nurturing-processing storage unit storage unit (41), an upper surface of its bottom part (a) forms the flat boy (51) and functions as a receiving part. In other words, unlike the receiving part of other nurturing-processing storage units, this flat boy (51) itself forms the receiving part (4e) but has not the flat extension part. The larvae eat prey (B) spread over the flat boy (51) and advance toward the fall part (40. The larvae arrived at the fall part (4f) fall onto the receiving part of (4e) of lower second nurturing-processing storage uniting storage unit (42) with such a manner that the larvae are divided into two groups each falls onto each receiving part of (4e) of the second nurturing-processing storage uniting storage unit (2-1, 2-2).
The larvae continue to grow in similar manner in the third nurturing-processing storage uniting (43) and nurturing-processing storage unit (44) whose number is increased by at a multiple of 2. After prey on the final nurturing-processing storage unit (45) is exhausted by the larvae, the larvae crowd at the fall par (4f) and fall onto a larvae collecting section (6A, 6B) which is a collecting container having a larger area than the final nurturing-processing storage unit (45).
Larvae collected in a collecting container arranged in the larvae collecting section (6A) are remained in this section for more than 5 days. Then, the collecting container contained the larvae is withdrawn out of the larvae nurturing room (2) under died condition.
A part of larval group is extracted and grown into adults. The resulting adult houseflies are guided or induced into the egg depositing-hatching unit (3) through a duct (not shown) by utilizing their habit of phototaxis and runnability for light and smell. Thus, houseflies are recycled.
Remaining group of larvae (A) that is not extracted in the larval collecting part (6A) is sacrificed by steaming, boiling, incineration or the like. The resulting product can be an animal food (E) of good quality rich in chitosan and is shipped after predetermined processing.
Now, a flow of livestock excreta is explained. In this Example, a prey or a food for larvae of houseflies or is prepared in a prey preparation unit (7). In this unit (7), soybean curd refuse and chaff (about 9:1) is added to pig excreta (chicken excreta) at a proportion of 20 to 40%, the water content is adjusted and mixed together. Food scraps also can be added to the excreta of livestock, so that the food residues are putrefied in excreta to prepare the prey. In fact, since food residues are putrefied in excreta to prepare and are changed to prey, the system according to the present invention can dispose of a huge volume of human food residues (garbage) together with excreta of livestock.
The resulting prey is fed to a prey supply section from which a predetermined amount of the prey (B) is conveyed to a prey supply hoppers (71A) (72B) of
Interior of the larvae nurturing room (2) is maintained at a temperature of 25 to 30° C. and a humidity of from 50% to 70%.
After or during the prey is supplied uniformly on the flat body (5, 51, 52-531), the flat body (5, 51, 52-531) is advanced into the larvae nurturing room (2) and stops therein. Hatched larvae are nurtured in the dark larvae nurturing room (2). The second instar larvae after the first ecdysis are also nurtured in dark or in twilight. The third instar larvae after the second ecdysis but before metamorphosis to pupae are nurtured under light for about 6 days. During the nurturing and breeding, larvae eat the prey in the nurturing-processing storage unit (4) and the prey is decomposed enzymatically within the larvae and excreted to produce the organic fertilizer base material
Almost all prey (B) composed of excreta of livestock etc. on the flat body (5, 51, 52-531) in the nurturing-processing storage unit (4) is treated by enzymatic decomposition within the body of larvae (A) and is excreted as the organic fertilizer base material (D).
Usually, from 65% to 90% of prey is eaten by larvae and remaining prey of from 10% to 35% is fermented, so that resulting products provide the objective organic fertilizer base material (D). In practice, the above products are mixed with corpse of larvae of housefly rich in chitosan and with cast-off skin of housefly to produce the final organic fertilizer base material (D).
The flat body (5, 51, 52-531) on which a product of organic fertilizer base material (D) is stocked is then moved again (to the right in
As explained above, the organic fertilizer production system shown in Example 1 according to the present invention repeats a cycle comprising (1) [Flow of egg deposition], (2) [Flow of larvae] and (3) [Flow of livestock excreta] for about one week to produce organic fertilizer base material repeatedly and automatically.
In the organic fertilizer production system of Example 1, the organic fertilizer base material is produced within the bodies of larvae of housefly enzymatic decomposition of excreta of livestock and excreted out of the larval. Therefore, there is no consumption of fuel which is necessary in case of incineration and an impact on the environment can be reduced, because there is no emotion of carbon dioxide. Still more, unlike the conventional bacterial detoxification, emission of long-lasting bad smell can be reduced or eliminated and there is no propagation or breeding of pathogens. In the system according to the present invention, excreta are disposed and handled safely by utilizing a preying habit of larvae of houseflies.
Still more, in the organic fertilizer production system of Example 1, there are 31 levels of the nurturing-processing storage units, so that larvae of houseflies are nourished and nurtured in an enough breeding area and volume with sufficient food. Therefore, large amount of excreta of livestock such as swine dung can be changed a large amount of excreta of livestock such as swine dung to organic fertilizer efficiently in a shorter period of time. In particular, the nurturing-processing storage section is divided into 31 nurturing-processing storage units, so that prey can be distributed uniformly or evenly with the progress of growth of larvae.
In addition, the organic fertilizer base material produced by the system according to the present invention contains abundant chitosan. Such organic fertilizer produced by the system according to the present invention can be used in preparation of organic fertilizer which can improve soil and the antibacterial activity, promote growth of plant, prevent disease of plant, and improve the quality of fruits. Finally, manual labor in the nurturing-processing storage unit can be reduced, so that the organic fertilizer can be produced efficiently with less effort.
Since a part of larvae group or of pupas is extracted and is brawn to imagoes and the resulting imagoes deposit eggs into prey, eggs of next generation are obtained or recycled in the system and hence no supply of additional eggs is necessary.
The larvae discharged from the final nurturing-processing storage unit can be used as animal food (E) of good quality rich in chitosan.
Example 2 is explained with reference to
In Example 2, whole or part of the extension part (4e) projected outwardly from the flat body (index-type) is replaced by an edged part (46) of an edged roller (461).
As shown in
It is known that the wounded larvae produce much antimicrobial peptides caused by healing power. To use this fact, in this Example, the parts (46) of the edged roller (461) inflect an abrasion on the skin of larvae of houseflies when they move and fall down onto next nurturing-processing storage unit.
The edged roller (461) can be positioned at a desired receiving part (4e) where the larvae produce much antimicrobial peptides and can extend whole or part of the receiving part.
Other functions and advantages of Example 2 are same as Example 1.
Example 3 is described with reference to
The structure of Example 3 is simplified in comparison with Example 1 in which the flat body (5, 51, 52-531) is reciprocated but cleaning of continuous plastic film (57) is required for its reuse.
Example 3 has such merits in comparison with Example 1 that the plant can be compact owing to use of a single nurturing-processing section (1) and of a continuous plastic film (57).
Example 4 is described with reference to
In Example 1, starting the first one nurturing-processing storage unit (41), a number of nurturing-processing storage units are increased with the multiplier of “2” and the final number of nurturing-processing storage units (45) becomes 16. While a number of nurturing-processing storage units (4) are increased with a multiplier of “3”, a number of nurturing-processing storage units (4) are increased with the multiplier of “3”. Example 4 shows this case.
As shown in
The degree of increment of the nurturing-processing storage units can be adjusted to the progress of growth of larvae, by designing and selecting appropriate number of divisions in each stage nurturing-processing storage unit by using the dividing method of Example 1 and Example 4 or other similar dividing method.
The width of the receiving part of Example 4 is narrower than that of Example 1. In this case, an area of lower nurturing-processing storage unit may be increased.
Similarly, a number of nurturing-processing storage units can be increased with the multiplier of “4”. In this case, four nurturing-processing storage units (472) are used in the second stage for one nurturing-processing storage units (471). Each second stage nurturing-processing storage unit (472) has a receiving part (X) whose width is ¼ of the width of the drop part (Y) of the first nurturing-processing storage unit (471).
Example 5 is explained with reference to
In Example 1 and Example 5, the drop part and the receiving part of the nurturing-processing storage units (4) are fixed, while the flat body is moved on an upper side of the bottom part.
In Example 5, the nurturing-processing storage units (4) used in Example 1 and Example 5 are constructed in a form of a movable container type (trays), so that a plurality of nurturing-processing storage units (4) themselves are displaced, as is shown in
As shown in
The tray (48) filled with organic fertilizer base material (D) which is an excreta of larvae is advanced from the larvae nurturing room (2) to the organic fertilizer base material collecting section (8). The organic fertilizer base material (D) is discharged from the trays (48) into a container by tilting or turning the trays. Other structure, functions and advantages are basically same as in Example 1 and are not described repeatedly.
Note that the present invention is not limited to above Examples as a matter of course, but can modify freely unless impair the characteristics of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-100358 | Apr 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2012/059312 | 4/5/2012 | WO | 00 | 1/6/2014 |
