JP2000128679A - Composting apparatus of organic waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely carry out stirring, mixing and transportation of a material to be treated by forming the shape of rotating blade of an agitator in a rake-like form and attaching an agitating blade in tangential direction to the rotating axis in planar fermentation system comprising mixing organic wastes with seed compost, piling up the mixture in ridge-like shape and agitating the pilled up material. SOLUTION: It is preferable that the rotational diameter of a rotating blade is >=60% of ridge height (h) and number of revolutions of the blade is >=60 rpm. A composing apparatus 1 proceeds toward a piled up material 2-1 to be treated and agitating blade 4 of an agitating part 3 cuts off the piled up material 2-1 and re-piles up the cut-off material as a piled up material 2-2. The composing apparatus 1 successively continues agitation of a part to be treated toward the piled up material 2-1. When the rotational diameter is defined as (l) and the length of ridge of a material to be treated is defined as L, the material to be treated piled up at one end of a fermentation tank by agitation of L/(l) times is fed to a discharge part. The agitating part 3 is raised by 13 m centering an axis 19 by a winding up chain and the composing apparatus 1 is fed to a feeding part on a rail 9. Composing of a material to be treated having 30% to 60% water content is made possible thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composting apparatus for composting organic waste such as sludge, household garbage, vegetable waste and the like by decomposition with aerobic microorganisms.

[0002]

2. Description of the Related Art Recently, the incineration of organic wastes has been increasingly recycle to minimize the burden on the environment and the difficulty of treating harmful substances generated during the incineration process. Under such circumstances, composting treatment has become widespread especially for organic waste. As a typical composting device for flat fermentation, an inclined conveyor type or blade type rotary type of agricultural cultivator was used, but the former was insufficient in mixing and stirring when the water content was high, and the latter was insufficient. However, there is a problem that the transfer is insufficient when the water content is high.
That is, conventionally, measures such as suppressing the initial water content to a low level of 50 to 55%, reducing the deposition height, and combining a rotary stirrer and a conveyor have been taken. However, improvements have been desired from the following points. 1) The mixture of the organic waste and the seed compost (at the start of fermentation), which is the material to be treated, supplied to the fermenter is as high as about 60% water, and at the end of fermentation, the water content is as low as about 30 to 40%. Rate. As described above, since the water content of the object changes, it is difficult to reliably perform mixing and stirring. 2) The height of the material to be treated in the fermenter is usually 0.8 m or more and may reach 1.8 m. The re-deposition can be performed while stirring and mixing the object to be processed and transferring it. Moreover, the stirrer is simple and easy to maintain. In particular, there has been a demand for a device capable of performing the above-described process using only a rotating device and easy maintenance.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to increase the water content of the object to be treated from 60% to 30%.
% Can be dealt with only by the number of rotations of the stirring blades of the composting device. Even if the accumulation height of the object changes from 0.8 m to 1.8 m, the object is stirred and mixed. Another object of the present invention is to provide a simple composting apparatus that can perform a transfer operation and can perform the above operation only with a simple stirrer.

[0004]

Means for Solving the Problems A first characteristic configuration of a full-scale composting apparatus for achieving the above object is to sort organic waste as described in claim 1 of the claims. A plane that mixes with compost, accumulates in ridges, and periodically stirs, mixes, and stirs the ridges with a stirrer that also serves as a fermentation process with aerobic microorganisms while supplying air from under the ridges The present invention is characterized in that the shape of the rotating blades of the stirrer is a rake-shaped unit in the fermentation method, and the stirring blades are mounted approximately tangentially to the rotation axis. The second feature is that the rotating diameter of the rotating blade is approximately 60 to the ridge height.
% Or more, and the number of rotations is 60 rpm or more. The operation and effect will be described below. The following operations and effects are produced by using the rake-shaped stirring blades as a unit for stirring, mixing, and transferring the first characteristic configuration and making the blades tangential to the rotation axis. Rake-shaped blade The blade member can be made thinner than when individual blades are directly attached to the rotating shaft. Since it is a rake-shaped unit, the number of attachments and removals is smaller than that of the individual blade method, and maintenance is easier. In addition, by mounting the rake-shaped blade parallel to the tangential direction with respect to the rotation axis, the object to be processed is scraped from the ridge by the rotation of the rake-shaped blade (at this time, crushing is also performed).
In addition, it is easy to effectively perform an operation of lifting the blade in a parabolic shape backward while moving (carrying) by the centrifugal force of the blade.
This effect can be easily achieved by adjusting the distance between the blades, more specifically, by adjusting the ratio of the width of the blades to the width of the blades. According to the second characteristic configuration, the object to be processed in front of the stirring device is scraped off and lifted by the centrifugal force to the rear of the stirring device, and deposited so as to maintain the height of the object to be processed before the stirring device. Can be done. This scraping, moving, lifting, and depositing operations allow the object to be ground, mixed, moved, and stirred and re-deposited, and the water content of the object is reduced from about 60% to 30%.
%, The pulverization, mixing, movement, stirring and re-deposition of the object can be satisfactorily performed only by the rotary stirring device.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a composting device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of the present invention. The composting device 1 proceeds in the direction of the sediment 2-1 to be treated, and the sediment 2-1 is cut off by the stirring blades 4 of the stirring unit 3 of the composting device 1 and moved rearward. It is deposited again on the deposit 2-2. The stirring unit 3 cuts (crushes), moves (transports), and re-deposits (mixing and stirring) as described above.
However, the composting device 1 continues to advance the drive wheels (the drive device is omitted), and continues the stirring of the processing target portion sequentially toward the front 2-1. In this way, the object to be treated is moved backward by the rotation diameter l of the stirring part by one stirring (one reciprocation). Therefore, if the length of the fermenter (ridge) of the object to be treated is L, L / L The to-be-processed material deposited at one end of the fermenter by one stirring is sent to the other end (discharge part). In the embodiment of the present invention, since l is about 1.8 m and L is 13 m, about 1
Stay for a week. If a conveyor is provided in the discharge section, 1
About 1.8 m of the ridge length of the material to be treated can be taken out of the fermenter by stirring twice. On the other hand, the ridge length is 1.8m in the supply section
Since "empty" is generated by the amount, the processing target can be newly supplied here. Usually, the agitation of the composting device 1 from the supply section to the discharge section is once a day. Then, the composting device that has advanced from the supply section to the discharge section returns to the supply section from the discharge section. This return operation is performed by winding up the hoisting chain (omitted) with a driving device (saving money) to raise the agitating unit 3 by 13 and about 2 m around the shaft 19, and in this state, the composting device feeds on the rail 9. This is done by forwarding to The rake-shaped stirring blade 4 of the present invention 20
The shape should be perpendicular to the rotation axis 6 and the number of rotations should be 6
When the water content of the object to be treated is as high as about 60%, the composting is completed by setting the stirring section diameter to 60% or more of the height h of the ridge of the object to be treated. As a result, good mixing, stirring, transfer, and crushing were carried out up to those close to (30%).

[Brief description of the drawings]

FIG. 1 is a diagram (side view) of a composting device according to the present invention.

FIG. 2 is a view of a stirring section of the composting apparatus according to the present invention. (A) Attaching state of stirring blades to a rotating shaft. (B) Side view of stirring blades. )

[Explanation of symbols]

 1. 2. Composting device of the present invention 2-1 Processed object to be stirred by composting device 2-2 Processed object after stirring Stirrer section 4. Stirring blade 5. Stirring blade mounting rod 6. Rotation axis 19. (Winding) shaft 20. Rake

Claims (2)

[Claims] 1. An organic waste is mixed with a seed compost, deposited in a ridge shape, and the ridge is periodically stirred by a stirrer which also serves as a stirrer, a mixer and a transporter. It is a flat fermentation type that ferments with an aerobic microorganism while taking care of it, characterized in that the shape of the rotating blade of the stirrer is in the form of a rake, and the stirring blade is attached approximately tangentially to the rotating shaft. Composting equipment. 2. A composting device according to claim 1, wherein the rotating diameter of the rotating blade of the stirrer is about 60% or more of the height of the ridge and the number of rotations is 60 rpm or more.