JPH06316476A - Composting device without retention in tank - Google Patents

Abstract

PURPOSE:To obtain a highly efficient composting device by providing two horizontal rotating shafts in a horizontal tank, furnishing a garbage transfer impeller to each rotating shaft and specifying the distance between the centers of the two rotating shafts, inner tank wall shape, etc. CONSTITUTION:Two horizontal rotating shafts 20 and 20' are provided in a horizontal tank A, and impellers 30 and 30' for transferring garbage are furnished to the shafts 20 and 20'. The distance L between the centers of the shafts 20 and 20' is controlled to a minimum so that the impellers 30 and 30' of the shafts are not brought into contact with each other. Meanwhile, the distance is adjusted to a maximum so that retention is not caused between the outermost circular paths of the impellers. Further, the inner tank wall below the horizontal plane including the shaft centers is separated from the outermost circular path of the impellers 30 and 30' by 10 to 50 mm, and the tank bottom surface is smoothly formed along the outermost circular path. Besides, the inner tank wall above the horizontal plane is inclined to an angle of 5 to 30 deg., and a composting device without any retention in the tank is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing compost formation in a tank.

[0002]

2. Description of the Related Art Hitherto, various composting treatment apparatuses having a horizontal stirring tank have been proposed. For example, there is Japanese Examined Patent Publication No. 3-73282, which has a proven track record as a small amount composting device. This device was made larger in size to be put into practical use as a horizontal biaxial device.
As described above, the semi-aged compost stays in the tank, particularly in a part of the bottom of the tank and a part of the upper part of the tank. The retention points are indicated by Z and Y in the figure. This stagnation increases the agitation torque due to the solidification of the semi-softened compost, which must often be stopped as a device. As described above, due to the retention in a fixed location, the ventilation in the retention location becomes extremely poor, resulting in anaerobic fermentation, which is one of the causes of unpleasant odor. The solidified compost is occasionally discharged from the stagnant portion, and this is mixed with normal compost, which leads to deterioration in quality of the obtained compost. Various problems such as occur.

Therefore, it is an object of the present invention to solve the problems in the above-mentioned horizontal type biaxial stirring type composting treatment apparatus and to provide a composting treatment apparatus which does not retain in a tank.

[0004]

In the composting treatment apparatus of the present invention which achieves the above-mentioned object and can prevent retention in a tank, a horizontal tank has two horizontal rotary shafts, and the rotary shaft is In a composting treatment apparatus having a stirring blade for transferring raw garbage, at least the distance L between the centers of two adjacent rotating shafts causes the two rotating shafts to contact the stirring blades of the other rotating shaft. The outermost circumference of the rotation locus of the stirring blade is the maximum outer circumference of the rotation locus of the stirring blade, and the tank inner wall below the horizontal plane including the center of the rotation axis is the outermost circumference of the rotation locus of the stirring blade. It has a slight distance C from the arc surface, the bottom of the tank is formed smoothly along the outermost arc of the rotation trajectory of the stirring blade, and the tank inner wall above the horizontal plane including the center of the rotation axis is inclined inward θ Must be formed into a curved shape It is characterized.

When the maximum radius of the stirring blade is r,
It is preferable to set the center-to-center distance L of two adjacent rotating shafts within the range of 0.65 ≦ L / 2r ≦ 1.05. Next, the distance C between the inner wall of the tank below the horizontal plane including the center of the rotation axis and the outermost circular arc surface of the rotation trajectory by the stirring blade is also 10 to 50 mm.
It is preferable to set it within the range.

Further, it is preferable that the inward inclination θ of the inner wall of the tank above the horizontal plane including the center of the rotation axis is set within the range of 5 ° ≦ θ ≦ 30 °.

[0007]

In the composting treatment apparatus of the present invention having the above-mentioned structure, raw garbage is fed and stirred by the stirring blades provided on the two rotating shafts to carry out composting. The distance L between the centers of two adjacent rotating shafts is the distance at which the two shafts do not come into contact with the stirring blades of the other rotating shaft at the minimum, and at the maximum the retention occurs between the outermost arcs of the rotation locus by the stirring blades. Since it is formed within the range of the distance that is not allowed, it can be transferred without causing stagnation between the stirring blades, and the tank inner wall below the horizontal plane including the center of the rotation axis is the outermost circular arc surface of the rotation trajectory by the stirring blades. Since there is a slight interval C and the bottom of the tank is formed smoothly along the outermost arc of the rotation trajectory of the stirring blade, stagnation may occur at the interval between the inner wall of the tank and the stirring blade and the bottom of the tank. Without Since the tank inner wall above the horizontal plane including the rotation axis center al is formed in a shape θ inclined inwardly, composting proceeds prevented securely retained in the vessel upper part.

That is, the inside of the tank can be thoroughly stirred by the stirring blades, and the semi-aged compost can be prevented from adhering and growing and staying between the stirring blades and at the bottom and the top of the tank.

[0009]

EXAMPLES Examples of the present invention will be illustrated below with reference to the drawings. FIGS. 1 and 2 show an example of the composting processing apparatus of the present invention.
Is a horizontal type treatment tank which is the whole apparatus, and in this embodiment, the treatment tank A is composed of a garbage disposal tank 10 and a plurality of divided fermentation tanks 11, 12 and 13, and an upper space between the tanks. There is a partition with a height that does not hinder the transfer as an overflow port, and it has two horizontal rotary shafts 20 and 20 '.
The stirring blades 30 and 30 'are provided at 0 and 20'.

The distance L between the centers P and P'of two adjacent rotary shafts 20 and 20 'is at least two rotary shafts 20 and 20'.
20 ′ is a distance that does not contact the stirring blade of the other rotating shaft, and is formed within the range of the distance between the maximum outer circumferential arcs of the rotation loci of the stirring blades 30 and 30 ′ that does not cause retention of the maximum. There is. Specifically, the stirring blades 30 and 3
When the maximum radius of 0 ′ is r, it is preferable that the distance is set within the range of 0.65 ≦ L / 2r ≦ 1.05.

Next, the inner walls of the tank D below the horizontal plane FF including the centers P and P'of the rotating shafts 20 and 20 'are the stirring blades 30 and 3.
It has an outermost circular arc surface of the rotation locus of 0'and a slight distance C, and the tank bottom surface is formed smoothly along the outermost circular arc of the rotation locus of the stirring blades 30 and 30 '. Specifically, the interval C is preferably in the range of 10 to 50 mm in order to prevent the occurrence of retention.

Incidentally, the agitating blades 30 and 3 are schematically shown.
0'is made of various known shapes such as those having a twist angle, and is formed at the same position or in front of the adjacent rotating shafts 20 and 20 'with a slight interval between the outermost circumferences of the rotation loci. In addition to FIG. 2, it may be mounted in such a manner that the outermost peripheries of its rotation loci overlap with each other by changing the position back and forth, and the rotation of the rotary shafts 20 and 20 ′ is intermittent. It can be programmed according to various kinds of dust such as gentle continuous rotation.

Further, according to the present invention, the inner wall of the tank above the horizontal planes F and F'including the centers P and P'of the rotary shafts 20 and 20 'has a shape inclined inward by .theta. Is preferably in the range of 5 ° ≦ θ ≦ 30 ° for practical use. The inclination angle θ is defined by a line connecting the point P extending from the upper end of the inner wall of the tank to the upper end in the tangential direction and the center P of the rotary shaft and the centers P and P ′ of the rotary shafts 20 and 20 ′.
The angle formed by the horizontal plane F-F 'is also the same.

Although FIG. 4 and FIG. 5 can be exemplified as other examples of the inner wall upper shape, FIGS. 2 and 3 are more preferable.
In FIG. 1, 14 is an inlet, 15 is an outlet, 16, 17
Is an exhaust stack, and 18 is a main motor. In practice, it is also possible to form the rotating shafts of the feeding tank 10 and the fermentation tanks 11, 12 and 13 completely separately and to change the rotation timing and the rotation speed. In this case, it is possible to facilitate the composting depending on the type of raw garbage and the like by individualizing the agitation mode of the input tank and the fermentation tank. In addition, the input tank 10 may also serve as a crushing tank, and the most subsequent tank of the fermentation tank may also serve as a storage tank.

Further, in FIG. 6, the charging tank 10 'and the rest are 1
The processing tank A'is shown divided into two large fermenters 11 ', and a compost return device B is provided at the end of the fermentation tank 11'.
Equipped with an inclined screw conveyor 50, some composts are returned to the charging tank 11 ′ again, and particularly when half-composted with a moisture content of 45% or less is returned.
The effect of maintaining the water content of the input garbage in a suitable fermentation range is great.

The case 60 of the return device has a space 61 formed thereabove so as to form an escape area for the compost in the return device so that the return can be smoothly performed. further,
In practice, a slit 70 for draining water is provided on the bottom of the charging tank as shown in FIG.
It is formed as shown in FIG. 10 and can exert a dehydrating effect on raw garbage. The raw garbage having a moisture content of 90% or more is reduced to 85%, preferably 80% or less without heating the tank. it can.

The slit 70 may be a small hole having a width of 0.3 to 7 mm and a length of 200 mm or less in the narrowest portion, and if the length is the shortest, the width and the length are the same. When the slit 70 is a circular small hole, the diameter of the circle is 1
It may be -10 mm. Generally, the slit 70 has a width and a length of 0.5 to 3 mm and a length of 50 to 100 mm.
Is often appropriate. It is preferable that these slits and small holes are flared from the inner surface of the tank to the outer surface of the tank.

In any of the above treatment tanks, air can be introduced into the tank or the introduced air can be heated to assist fermentation.

[0019]

As described above, according to the device of the present invention, 2
Between the stirring blades installed on the rotating shaft of the book, the bottom of the tank and the top of the tank will not be stuck with raw garbage or semi-softened compost, and the semi-composted compost will be locally compressed during the raw garbage composting process. Since it can be stirred and transferred uniformly without sagging, the stirring efficiency of the stirring blade can be enhanced, and excellent effects of promoting good composting are high.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a device of the present invention.

FIG. 2 is a schematic front view illustrating a stirring blade and a tank shape in the tank.

FIG. 3 is a first modified front view of FIG.

FIG. 4 is a second modified front view of FIG.

FIG. 5 is a third modified front view of FIG. 2.

FIG. 6 is a schematic cross-sectional view showing a modified example of the device.

FIG. 7 is a partial cross-sectional view of the returning device.

FIG. 8 is a schematic cross-sectional view showing a tank bottom having a slit formed therein.

9 is a plan view of FIG. 8. FIG.

10A is an enlarged sectional view taken along line I-I of FIG. 9, and FIG. 10B is an enlarged sectional view taken along line II-II of FIG. 9.

FIG. 11 is a schematic front view showing a conventional example of a tank shape.

FIG. 12 is a schematic front view showing another example of a conventional tank shape.

[Explanation of symbols]

 A Treatment tank 10 Input tank 11, 12, 13 Fermenter 20, 20 'Rotating shaft 30, 30' Stirring blade P, P'Center of rotating shaft F, F'Horizontal plane r Rotating track radius of stirring blade θ Above inner wall of tank Inclination angle

Claims (4)

[Claims] 1. A composting treatment apparatus having two horizontal rotary shafts in a horizontal tank, and the rotary shafts having stirring blades for transferring raw dust, wherein two adjacent rotary shafts are provided. The center-to-center distance L of the two rotation shafts is within a range in which the two rotation shafts do not contact the stirring blades of the other rotation shaft, and the maximum distance is within the distance between the outermost circular arcs of the rotation locus of the stirring blades. The inner wall of the tank below the horizontal plane including the center of the rotation axis has a slight distance C from the outermost circumferential arc surface of the rotation locus of the stirring blade, and the bottom surface of the tank is along the outermost circumferential arc of the rotation trajectory of the stirring blade. An apparatus for preventing internal retention in a tank, characterized in that the tank inner wall is formed smoothly, and the inner wall of the tank above the horizontal plane including the center of the rotation axis is inclined inwardly θ. 2. The composting treatment apparatus according to claim 1, wherein when the maximum radius of the stirring blade is r, the center-to-center distance L between two adjacent rotating shafts is 0.65 ≦ L / In-tank retention prevention composting treatment device set within the range of 2r ≦ 1.05 3. The composting treatment apparatus according to claim 1, wherein the interval C between the inner wall of the tank below the horizontal plane including the center of the rotation axis and the outermost circumferential arc surface of the locus of rotation by the stirring blade is 10.
A stagnation prevention type composting treatment device set within the range of up to 50 mm. 4. The composting treatment apparatus according to claim 1, wherein the inward inclination θ of the inner wall of the tank above the horizontal plane including the center of the rotation axis is within a range of 5 ° ≦ θ ≦ 30 °. A composting treatment device that prevents stagnation in the tank.