CN111530900A

CN111530900A - Kitchen waste treatment system and use method thereof

Info

Publication number: CN111530900A
Application number: CN202010499415.3A
Authority: CN
Inventors: 许岳虎; 杨帆; 陈力
Original assignee: Hunan Natural Creation Biotechnology Co ltd
Current assignee: Hunan Natural Creation Biotechnology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2020-08-14
Anticipated expiration: 2040-06-04
Also published as: CN111530900B

Abstract

The embodiment of the disclosure provides a kitchen waste treatment system and a using method thereof, and belongs to the technical field of environmental protection. The kitchen waste treatment system includes: the blanking device comprises a charging bucket and a blanking machine, and a pump inlet of the blanking machine extends into the charging bucket; the conveying device comprises a conveying track, a first feeding hole and a first discharging hole, wherein the first feeding hole and the first discharging hole are respectively formed in two ends of the conveying track; the screening device comprises a conveying cylinder for conveying the decomposed and digested mixture, a drum screen for screening out large-volume interferents in the mixture and a probability screen for screening out small-volume interferents, and an air outlet is formed in the middle of the conveying cylinder; and the collection processing device is connected with the probability screen. By the treatment scheme, the treatment efficiency and the environmental protection performance of the kitchen waste treatment system on the kitchen waste are improved.

Description

Kitchen waste treatment system and use method thereof

Technical Field

The disclosure relates to the technical field of environmental protection, in particular to a kitchen waste treatment system and a using method thereof.

Background

At present, with the development of society and the increase of population, the damage of the generated domestic garbage to the environment becomes more serious, and improper kitchen garbage treatment can easily cause environmental pollution, but most of the existing kitchen garbage treatment systems are compressed and then are intensively buried or burned, so that the cost is high, the treatment steps are complex, and the environment is easily polluted.

Therefore, an environment-friendly, efficient and automatic kitchen waste treatment scheme is urgently needed.

Disclosure of Invention

In view of the above, the present disclosure provides a kitchen waste disposal system and a method for using the same, which aims to solve the above problems.

In a first aspect, an embodiment of the present disclosure provides a kitchen waste treatment system, including:

the blanking device comprises a charging bucket and a blanking machine, and a pump inlet of the blanking machine extends into the charging bucket;

the conveying device comprises a conveying track, and a first feeding hole and a first discharging hole which are respectively arranged at two ends of the conveying track, wherein a pump outlet of the blanking machine extends into the first feeding hole, and the blanking machine is used for conveying kitchen waste and/or digestive organisms in the feed tank to the conveying track through the first feeding hole so that the kitchen waste is decomposed and digested on the conveying track by the digestive organisms;

the screening device comprises a conveying cylinder for conveying the decomposed and digested mixture, a rotary screen for screening out large-volume interferents in the mixture and a probability screen for screening out small-volume interferents, a second feed port of the conveying cylinder is communicated with a first discharge port of the conveying track, the probability screen is communicated with a third discharge port of the rotary screen, the rotary screen is arranged at the second discharge port of the conveying cylinder, an air outlet is formed in the middle of the conveying cylinder, an air separator for removing light interferents is arranged in the conveying cylinder corresponding to the air outlet, and the air separator faces the air outlet;

and the collecting and processing device is connected with the probability screen and is used for collecting the digestive organisms screened out of the drum screen.

According to a specific implementation manner of the embodiment of the disclosure, the conveying device further comprises a lifter, a plurality of box bodies and a plurality of layers of supports;

the lifters are arranged at the two ends of the conveying track;

the conveying track set up in on the support, box body bottom or both sides are provided with the gyro wheel, the gyro wheel joint is in the conveying track, the box body passes through the gyro wheel is followed the conveying track removes.

According to a specific implementation manner of the embodiment of the disclosure, the elevator comprises a mechanical arm, a motor and a horizontally placed support frame;

the supporting frame is clamped by the mechanical arm, is positioned at the same horizontal position with the conveying track and is close to the conveying track;

the box body moves to the supporting frame along the conveying track, a driving shaft of the motor is connected with the mechanical arm, and the mechanical arm drives the supporting frame to move up and down to the conveying track with different heights.

According to a specific implementation manner of the embodiment of the disclosure, a joint of the mechanical arm and the lifter is a bearing structure, and a central shaft of the bearing structure is arranged on the lifter;

the motor drives the mechanical arm to clamp the supporting frame, so that the supporting frame can turn along the central shaft and is used for dumping insect materials in the box body.

According to a specific implementation manner of the embodiment of the disclosure, the air separator comprises a first air separator and a second air separator;

the blowing direction orientation of first air separator the air outlet, the second air separator is located first air separator below, the blowing direction orientation of second air separator the mouth of blowing of first air separator the mouth of blowing position of second air separator is provided with cowl.

According to a specific implementation manner of the embodiment of the disclosure, the drum screen is of a cylindrical structure with openings at two ends, one end of the drum screen is communicated with the conveying cylinder, and the other end of the drum screen is connected with the probability screen;

the drum screen is provided with oval screen holes distributed in an array mode, the minor axis of each oval screen hole is 0.5 cm, and the major axis of each oval screen hole is 3 cm.

According to a specific implementation manner of the embodiment of the disclosure, the collection processing device comprises a dryer and a cooking machine;

one end of the cooking machine is connected with the probability sieve, the other end of the cooking machine is communicated with the dryer, the cooking machine is used for performing cooking sterilization treatment on the digestive organisms screened out of the probability sieve, and the dryer is used for conveying the digested organisms subjected to cooking treatment into the dryer for drying treatment.

In a second aspect, the disclosed embodiments provide a method of using a kitchen waste treatment system, for using the kitchen waste treatment system as described in any one of the above disclosed embodiments, the method comprising:

providing a kitchen waste treatment system and insect material, wherein the kitchen waste treatment system comprises a blanking device, a conveying device, a screening device and a collecting and treating device;

controlling a blanking machine of the blanking device to convey the insect material to a conveying track of the conveying device for digestion and decomposition;

after a preset digestion time period, controlling a lifter of the conveying device to move the box body of the conveying device to the first discharge hole, and turning over the box body to convey the decomposed and digested mixture to the screening device;

controlling the screening device to screen the decomposed and digested mixture, and conveying the screened digestive organisms to the collection processing device.

after the step of controlling the screening device to perform the screening operation on the decomposed and digested mixture and to transfer the screened digested organisms to the collection processing device, the method further includes:

controlling the cooking machine to perform cooking treatment operation on the digestive organisms to obtain the digestive organisms subjected to cooking sterilization;

and controlling the dryer to convey the digested organisms subjected to the cooking sterilization treatment into the dryer for drying operation to obtain the dried digested organisms.

According to a specific implementation manner of the embodiment of the disclosure, the screening device comprises a conveying cylinder, a rotary screen and a probability screen;

the step of controlling the screening device to perform a screening operation on the decomposed and digested mixture and to transfer the screened digested organisms to the collection processing device includes:

controlling a winnowing machine arranged in the conveying cylinder to screen out light interferents in the decomposed and digested primary mixture to obtain a secondary mixture containing the digestive organisms;

controlling the drum screen to screen out large-volume interferent in the secondary mixture to obtain a tertiary mixture containing the digestive organisms;

controlling the probability screen to screen out small-volume interferents in the third-level mixture to obtain the digestive organisms;

transferring the screened digestive organisms to the collection processing device.

The kitchen waste treatment system in the embodiment of the present disclosure includes: the blanking device comprises a charging bucket and a blanking machine, and a pump inlet of the blanking machine extends into the charging bucket; the conveying device comprises a conveying track, and a first feeding hole and a first discharging hole which are respectively arranged at two ends of the conveying track, wherein a pump outlet of the blanking machine extends into the first feeding hole, and the blanking machine is used for conveying kitchen waste and/or digestive organisms in the feed tank to the conveying track through the first feeding hole so that the kitchen waste is decomposed and digested on the conveying track by the digestive organisms; the screening device comprises a conveying cylinder for conveying the decomposed and digested mixture, a rotary screen for screening out large-volume interferents in the mixture and a probability screen for screening out small-volume interferents, a second feed port of the conveying cylinder is communicated with a first discharge port of the conveying track, the probability screen is communicated with a third discharge port of the rotary screen, the rotary screen is arranged at the second discharge port of the conveying cylinder, an air outlet is formed in the middle of the conveying cylinder, an air separator for removing light interferents is arranged in the conveying cylinder corresponding to the air outlet, and the air separator faces the air outlet; and the collecting and processing device is connected with the probability screen and is used for collecting the digestive organisms screened out of the drum screen. By the scheme, the kitchen waste treatment system improves the treatment efficiency and the environmental protection performance of the kitchen waste treatment system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a kitchen waste treatment system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another kitchen waste treatment system according to an embodiment of the present disclosure.

Summary of reference numerals:

a blanking device 110, a charging bucket 111 and a blanking machine 112;

a transfer device 120, a transfer rail 121, a lifter 122, a cassette 123, a bracket 124;

a screening device 130, a conveying cylinder 131, a rotary screen 132 and a probability screen 133;

a collection processing device 140, a dryer 141 and a cooking machine 142.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

The embodiment of the disclosure provides a kitchen waste treatment system. The method can be applied to the situation of treating kitchen garbage by using the hermetia illucens.

Referring to fig. 1, a schematic structural diagram of a kitchen waste disposal system according to an embodiment of the present disclosure is provided. As shown in fig. 1 and 2, the kitchen waste disposal system mainly includes:

the blanking device 110 comprises a charging bucket 111 and a blanking machine 112, and a pump inlet of the blanking machine 112 extends into the charging bucket 111;

the conveying device 120 comprises a conveying track 121 and a first feeding hole and a first discharging hole which are respectively arranged at two ends of the conveying track 121, a pump outlet of the blanking machine 112 extends into the first feeding hole, and the blanking machine 112 is used for conveying the kitchen waste and the digestion organisms in the charging bucket 111 to the conveying track 121 through the first feeding hole, so that the digestion organisms decompose and digest the kitchen waste on the conveying track 121;

the screening device 130 comprises a conveying cylinder 131 for conveying the decomposed and digested mixture, a rotary screen 132 for screening out large-volume interferents in the mixture and a probability screen 133 for screening out small-volume interferents, a second feeding port of the conveying cylinder 131 is communicated with a first discharging port of the conveying rail 121, the probability screen 133 is communicated with a third discharging port of the rotary screen 132, the rotary screen 132 is arranged at a second discharging port of the conveying cylinder 131, an air outlet is formed in the middle of the conveying cylinder 131, an air separator for removing light interferents is arranged in the conveying cylinder 131 and corresponds to the air outlet, and the air separator faces the air outlet;

a collecting and processing device 140, wherein the collecting and processing device 140 is connected with the probability sieve 133, and the collecting and processing device 140 is used for collecting the digestive organisms screened out of the drum sieve 132.

During specific assembly, the charging bucket 111 is communicated with a pump inlet of the blanking machine 112, a pump outlet of the blanking machine 112 extends into the first feeding hole formed in one end of the conveying rail 121, the first discharging hole in the other end of the conveying rail 121 is communicated with the second feeding hole of the conveying cylinder 131, the probability sieve 133 is communicated with the third discharging hole of the rotary sieve 132, an air outlet is formed in the middle of the conveying cylinder 131, the air separator faces the air outlet, the second discharging hole of the conveying cylinder 131 is connected with the rotary sieve 132, and the collecting and processing device 140 is arranged on the periphery of the rotary sieve 132.

When the blanking device 110 is used, the kitchen waste and the digestive organisms are pumped out to the conveying device 120, wherein the digestive organisms can be hermetia illucens with strong digestion and decomposition capability, after the hermetia illucens finish decomposing and digesting the kitchen waste on the conveying device 120, the conveying device 120 conveys the decomposed and digested mixture to the screening device 130 to separate the hermetia illucens, the decomposed waste and other interferents, and then the screened hermetia illucens are conveyed to the collection and treatment device to be processed.

The pump outlet corresponding to the pump of the blanking device 110 extends into the first feeding hole, the blanking machine 112 is used for conveying the kitchen waste and the hermetia illucens in the material tank 111 to the conveying track 121 through the first feeding hole, so that the hermetia illucens breaks down and digests the kitchen waste on the conveying rail 121, then the decomposed and digested mixture is conveyed to the conveying cylinder 131, after light interferents are removed by a winnowing machine arranged at the position corresponding to the air outlet in the conveying cylinder, and conveying the mixture subjected to winnowing to the rotary screen 132 to screen out substances such as large-volume sundries, insect sand and the like, conveying the mixture subjected to the screening by the rotary screen 132 to the probability screen to screen out small-particle residues to obtain the hermetia illucens, and collecting and processing the screened hermetia illucens by the collecting and processing device 140.

On the basis of the above embodiment, the conveying device 120 further includes an elevator 122, a plurality of cassettes 123 and a multi-layer support 124;

the lifters 122 are disposed at two ends of the conveying rail 121;

the conveying track 121 is arranged on the support 124, the bottom of the box body 123 is provided with a roller, the roller is clamped in the conveying track 121, and the box body 123 moves along the conveying track 121 through the roller.

Optionally, the elevator 122 includes a mechanical arm, a motor and a horizontally disposed support frame;

the supporting frame is clamped by the mechanical arm, is positioned at the same horizontal position with the conveying rail 121 and is close to the conveying rail 121;

the box body 123 moves to the support frame along the conveying rail 121, a driving shaft of the motor is connected with the mechanical arm, and the mechanical arm drives the support frame to move up and down to the conveying rail 121 with different heights.

Optionally, a joint between the mechanical arm and the lifter 122 is a bearing structure, and a central shaft of the bearing structure is disposed on the lifter 122;

the motor drives the mechanical arm to clamp the support frame, so that the support frame is turned over along the central shaft and is used for dumping the insect material in the box body 123.

During specific assembly, the conveying track 121 is arranged on the support 124, rollers are arranged at the bottom of the box body 123 and clamped in the conveying track 121, the elevator 122 is provided with the motor, the mechanical arm and the support frame horizontally arranged, the support frame and the conveying track 121 are located at the same horizontal position and are close to the conveying track 121, one end of the mechanical arm is connected with a driving shaft of the motor, the support frame is clamped at the other end of the mechanical arm, a joint of the mechanical arm and the elevator 122 is of a bearing structure, and a central shaft of the bearing structure is arranged on the elevator 122.

When the device is used, the space utilization rate and the conveying efficiency are improved by arranging the plurality of layers of the brackets 124 and the plurality of the box bodies 123. The box body 123 holds kitchen waste and the heisui river horsefly can pass through the gyro wheel is followed the transfer orbit 121 removes, certainly, can also set up the conveyer belt on the transfer orbit 121, the conveyer belt with the laminating of box body 123 bottom is by the conveyer belt drive the box body 123 is in slide on the transfer orbit 121, perhaps, can also set up the fluent strip on the transfer orbit 121, the fluent strip with the laminating of box body 123 bottom, the box body 123 passes through the fluent strip and follows the transfer orbit 121 slides. The box body 123 is in slide on the transfer orbit 121 extremely on the carriage, motor drive the arm centre gripping the carriage reciprocates the carriage is to other heights on the transfer orbit 121, the completion is in conveyer 120's vertical transport, certainly, after the digestion has decomposed kitchen garbage the arm also can the centre gripping the carriage along bearing arrangement overturns, will in the box body 123 the heisui river horsefly with decompose the mixture after the digestion and empty extremely carry a section of thick bamboo 131, carry out operation flow on next step.

On the basis of the above embodiment, the air separator comprises a first air separator and a second air separator;

When the screening device is used, the first winnowing machine screens out substances lighter than the hermetia illucens in the decomposed and digested mixture, and the falling speed of the decomposed and digested mixture is changed through the second winnowing machine, so that the screening effect is better. The kitchen garbage is by some light matters that can't be decomposed and digested, such as pepper skin, fibre etc. can remain after the heisui river horsefly decomposes the digestion, through first air separator will light interferent thing in the mixture after decomposing the digestion sieves out, the mouth of blowing position of second air separator is through setting up arc baffle makes the wind direction of second air separator with the whereabouts direction of the mixture after decomposing the digestion is opposite, will other light interferents in the mixture after decomposing the digestion blow to the air outlet position sieves out.

On the basis of the above embodiment, the trommel 132 is a cylindrical structure with two open ends, one end of the trommel 132 is communicated with the conveying cylinder 131, and the other end of the trommel 132 is connected with the probability screen 133;

the drum sieve 132 is provided with elliptical sieve holes arranged in an array, and the minor axis of each elliptical sieve hole is 0.5 cm and the major axis is 3 cm.

When the rotary screen is used, the rotary screen 132 is provided with oval screen holes which are arranged in an array manner, and each oval screen hole is in the shape and size of the adult hermetia illucens. The air-separated mixture is conveyed to the drum sieve 132, when the drum sieve 132 works, the drum sieve 132 rotates to enable the digestive organisms in the mixture to be just screened out by the drum sieve 132 through the oval sieve holes, and then the digestive organisms are conveyed to the collecting and processing device 140, and meanwhile, large-volume interferents such as plastic bags, thin film paper and the like are separated out. Of course, the shape and size of the screen openings can be varied when other digestive organisms are selected for the decomposition and digestion of the kitchen waste.

On the basis of the above embodiment, the collection processing device 140 includes a dryer 141 and a cooking machine 142;

one end of the cooking machine 142 is connected with the probability sieve 133, the other end of the cooking machine 142 is communicated with the dryer 141, the cooking machine 142 is used for performing cooking sterilization treatment on the digestive organisms screened out of the probability sieve 133, and the dryer 141 is used for conveying the digested organisms after the cooking treatment into the dryer 141 for drying treatment.

In use, the dryer 141 and the cooking machine 142 are used to process the screened digestive organisms for reuse. Can use the cooking machine 142 will sieve out the heisui river horsefly convey to cook in the cooking machine 142 and handle, it is right the heisui river horsefly carries out pasteurization, then will cook the back heisui river horsefly convey to drying-machine 141 in carry out drying process, subsequent storage and sale of being convenient for, certainly, can also use cleaning equipment with cooking machine 142 connects cooking machine 142 is right after the heisui river horsefly cooks, cleaning equipment is right the heisui river horsefly washs and cools down, then will wash after the cooling heisui river horsefly carries to refrigeration plant, will the heisui river horsefly carries out refrigeration process, subsequent storage and sale of being convenient for.

The embodiment of the disclosure also provides a use method of the kitchen waste treatment system, and the method comprises the following steps:

in specific implementation, the blanking device is controlled to convey the kitchen waste and the digestion organisms in the material tank to the conveying track through the first feeding hole, and the conveying track bears a mixture of the kitchen waste and the digestion organisms, so that the digestion organisms decompose and digest the kitchen waste on the conveying track.

during specific implementation, the digestion time period can be preset to be 7 days, the digestion time period is defined to be utilized by the aid of the hermetia illucens to decompose and digest kitchen waste, and after 7 days, the hermetia illucens are in the box body to decompose and digest kitchen waste, the lifter of the conveying device is controlled to move the box body of the conveying device to the first discharge hole, and the box body is overturned to convey a decomposed and digested mixture to the screening device.

The decomposed and digested mixture comprises digestive organisms and kitchen waste which cannot be decomposed by the digestive organisms, the screening device is controlled to screen the decomposed and digested mixture, and after the screening device screens the digestive organisms which decompose and digested the mixture, the digestive organisms are conveyed to the collecting and processing device.

On the basis of the above embodiment, the collection processing device comprises a dryer and a cooking machine;

For example, can use the cooking machine will sieve out the heisui river horsefly convey to cook in the cooking machine and handle, it is right the heisui river horsefly carries out pasteurization, then will cook after the sterilization heisui river horsefly convey to drying-process carries out drying treatment in the drying-machine, subsequent storage and sale of being convenient for, certainly, can also use cleaning equipment with the cooking machine is connected the cooking machine is right after the heisui river horsefly cooks, cleaning equipment is right the heisui river horsefly washs and cools down, then will wash after the cooling heisui river horsefly carry to refrigeration plant, will the heisui river horsefly carries out refrigeration treatment, subsequent storage and sale of being convenient for. Of course, the dryer can be used for low-temperature drying operation for other components which need to be stored and are not high in temperature resistance.

On the basis of the above embodiment, the screening device comprises a conveying cylinder, a rotary screen and a probability screen;

In specific implementation, the decomposed and digested mixture is conveyed into the conveying cylinder, a winnowing machine arranged in the conveying cylinder is controlled to remove the light interferents in the decomposed and digested mixture, wherein, the wind directions of the two winnowing machines are different, the light interferents in the decomposed and digested mixture can be screened out to the maximum extent, and after the light interferents are screened out by the winnowing machines, and then conveying the decomposed and digested mixture subjected to winnowing screening to the rotary screen, controlling the rotary screen to screen out large-volume interferent from the decomposed and digested mixture subjected to light interferent screening, screening out large-volume interferent such as plastic bags and thin film paper, controlling the probability screen to screen out small-particle interferent such as fine sand in the mixture, and then conveying the screened black soldier fly to the collection processing device.

In summary, the kitchen waste treatment system of the embodiment of the present disclosure realizes an automatic waste treatment mode by providing the blanking device, the conveying device and the screening device, reduces the damage to the environment by treating the kitchen waste through the digestive organisms, and improves the treatment efficiency and the environmental protection performance of the kitchen waste.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A kitchen waste disposal system comprising:

2. The system of claim 1, wherein the conveyor further comprises an elevator, a plurality of cassettes, and a multi-tier rack;

the lifters are arranged at the two ends of the conveying track;

3. The system of claim 2, wherein the elevator comprises a robotic arm, a motor, and a horizontally disposed support frame;

4. The system of claim 3, wherein the connection between the mechanical arm and the elevator is a bearing structure, and a central shaft of the bearing structure is arranged on the elevator;

5. The system of claim 1, wherein the air classifier comprises a first air classifier and a second air classifier;

6. The system according to claim 1, wherein the trommel is a cylindrical structure with two open ends, one end of the trommel is communicated with the conveying cylinder, and the other end of the trommel is connected with the probability screen;

7. The system of claim 1, wherein the collection processing device comprises a dryer and a cooker;

8. A method of using a kitchen waste treatment system, the method being applied to the kitchen waste treatment system of any one of claims 1 to 7, the method comprising:

9. The method of claim 8, wherein the collection processing device comprises a dryer and a cooker;

10. The method of claim 8, wherein the screening device comprises a conveyor cylinder, a trommel, and a probability screen;