JPH09227259A - Compost fermentation tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compost fermentation tank contributing to a reduction of a running cost. SOLUTION: The ventilators 4 of the compost fermentation tank provided with the ventilators for ventilating the mixture housed therein are formed to multiple stages and the lower parts of the ventilators of the respective stages are provided with transfer devices 5 of a rotary type. These transfer devices 5 of the rotary type are provided with revolving shafts 6 and fins mounted at these revolving shafts. The transfer devices 5 of the rotary type are disposed in a plurality in the lower parts of the ventilators 4, 4 of the respective stages. The mixture 15 is transferred successively from the upper stages to the lower stages by the intermittent driving of the transfer devices 5 of the rotary type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compost fermenter for producing compost, which is equipped with an aeration device for supplying air to a mixture contained in the tank.

[0002]

2. Description of the Related Art Generally, in order to process and produce compost from organic sludge such as sewage sludge, a water conditioner such as compost and wood chips after fermentation and a fermentation accelerator (microorganism) are used.
Mix with organic sludge to give a specified water content (eg, about 60%)
The mixture is fermented in the primary fermenter for a predetermined number of days, and then sequentially aged in the secondary fermentor, and then the wood chips and the like are separated from the fermented and dried mixture by a sieving machine to obtain the mixture. To be Further, since a predetermined amount of oxygen is required during fermentation and ripening, an aeration device is provided in each fermentation chamber to supply air into the mixture.

In this ventilation device, for example, a plurality of ventilation pipes having a large number of ventilation holes on the peripheral surface are vertically arranged in the fermentation chamber, and the lower end openings of the respective ventilation pipes are closed, while the upper end opening is used as an air supply device. The air is supplied from the supply device to each aeration pipe so that the air is supplied to the mixture in the fermentation tank.

In the conventional compost fermenter, it was necessary to carry out sufficient agitation and mixing by using a turning device or the like in order to promote the fermentation of the mixture and prevent the mixture from solidifying in the fermenter.

As shown in FIG. 6, the conventional compost fermenter has a structure in which a plurality of fermenters 1 and 2 are arranged side by side, and aeration devices 4 and 4 are fixed or can be taken out from the inside of the fermenter. According to the fermentation stage of the mixture, the first fermentation tank 1 performs the primary fermentation, and then the mixture is transferred to the second fermentation tank 2 to perform the secondary fermentation.

[0006]

However, according to the conventional compost fermenter shown in FIG. 5, since the whole mixture is stirred and mixed inside the fermenter, a large amount of electric power is required to drive the turning device 18 and the like. Was needed. Further, since the mixture is transferred to another fermentation tank depending on the fermentation stage, there is a problem that a large-scale device such as various conveyors 14 is required and the cost is increased.

Therefore, according to the present invention, the compost fermenter is formed in a multi-stage manner, and after the mixture is put into the fermenter, the fermenting is carried out by sequentially transferring from the upper stage to the lower stage by the rotary transfer device according to the fermentation stage. The purpose of the present invention is to provide a compost fermenter capable of reducing running costs by performing stirring and mixing at each stage simultaneously with the transfer.

[0008]

According to the present invention, in a compost fermenter equipped with an aeration device for aerating a contained mixture, the aeration device of the fermentation tank is formed in multiple stages, and the aeration device of each stage is provided. It is configured by providing a rotary transfer device in the lower part of the.

The rotary transfer device preferably comprises a rotary shaft and fins attached to the rotary shaft.

The mixture is put into the upper stage of the fermentation tank, the fermentation is progressed by the aeration device of each stage, and the mixture is agitated and mixed by intermittent driving of a rotary transfer device arranged at the lower part of the aeration device according to the fermentation stage. It is dropped and transferred to the lower stage and fermentation is sequentially performed in each stage of the fermentation tank.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings.

FIG. 1 is a sectional view showing a part of a fermenter of a compost fermenting apparatus according to the present invention, FIG. 2 is a perspective view showing an aeration device used in the present invention, and FIG. 3 is a rotary transfer apparatus according to the present invention. FIG. 4 is a perspective view showing a part of FIG. 4, and FIG. 4 is a schematic sectional view showing an installed state of the compost fermentation tank according to the present invention.

As shown in FIGS. 1 and 4, the fermenter 1 is made of concrete and has a rectangular parallelepiped shape. An openable and closable cover 3 is provided on the upper and lower parts of the fermenter 1 to maintain heat insulation. It is designed to improve and prevent generation of odor. Inside the fermenter, an aeration device 4 in which air supply pipes 10 and exhaust pipes 11 to be described later are alternately arranged is arranged in multiple stages. A plurality of rotary transfer devices 5 are arranged in parallel with the ventilation device 4 below the ventilation device 4 in each stage.

As shown in FIG. 3, the rotary transfer device 5 comprises a rotary shaft 6 made of steel pipe and fins 7, and is intermittently driven to rotate by a drive device (not shown).

The fins 7 attached to the rotary shaft 6 are
Elongated form over the entire shaft (see Fig. 3 (a)), or form with many narrow claws attached (see Fig. 3 (b))
Etc. are formed.

Further, when the rotary transfer device is intermittently driven, if the drive is performed by reversing and rotating at regular intervals, the mixture is more uniformly dropped and transferred to the lower stage.

As shown in FIG. 2, the ventilation device 4 includes a plurality of horizontal air supply ducts 8, a plurality of air supply pipes 10 communicating with the air supply ducts 8, and a plurality of horizontal exhaust ducts 9.
And a large number of exhaust pipes 11 communicating with the exhaust duct. The ventilation device is formed in a rectangular cross section in which the air supply ducts 8 and the exhaust ducts 9 are alternately arranged, and the support rods 13 are attached to the upper portions of the air supply ducts 8 and the exhaust ducts 9 along the arrangement direction. There is. At the lower part of the air supply duct 8, the upper ends of a large number of air supply pipes 10 each having a circular cross section are connected and communicated with each other at predetermined intervals, and each air supply pipe 10 is provided substantially vertically. The exhaust duct 9 and the exhaust pipe 11 are also communicatively connected. These air supply pipes 10,
The exhaust pipe 11 is provided with a large number of small holes 12, and the number of these small holes 12 is provided so as to increase toward the lower portion of the pipe. The lower ends of the air supply pipe 10 connected to the air supply duct 8 and the exhaust pipe 11 connected to the exhaust duct 9 are closed by a cap.

The ventilator 4 constructed as described above is forcibly exhausted by the turbofan connected to the exhaust duct 9, and the air supply duct 8 is forcibly ventilated by the turbofan, or by the pressure difference due to the exhaust. To do.

In the fermentor having the above structure, the mixture 15
As shown in FIG. 4, is fed from the upper part of the fermentation tank by the belt conveyor 14 and the like, and falls from between the ventilation duct 8 and the exhaust duct 9 into the upper stage 1a of the fermentation tank. After that, the rotary transfer device is intermittently driven, scratches the mixture at the bottom of the upper stage of the fermentation tank, and drops and transfers it to the lower stage 1b of the fermentation tank. The mixture 15 is dropped and transferred to the lower stage by the rotary transfer device 5 and simultaneously stirred and mixed.

A belt conveyor 14 is placed below the rotary transfer device at the bottom stage 1c of the fermentation tank to collect the mixture after fermentation. Instead of a belt conveyor, a shovel loader or the like may be used for collection.

In the compost fermenter of the present invention, a beam 16 can be provided between the rotary transfer devices 5 as shown in FIG. 4, and this beam can reduce the number of rotary transfer devices. In addition, as shown in FIG.
By providing a claw 17 that meshes with the fins 7 attached to, it is possible to crush the mixture while transferring it. However, in the present invention in which the aeration device of the fermenter is formed in multiple stages, and the rotary transfer device is provided below the aeration device of each stage, the relationship between the fins 7 attached to the rotating shaft 6 and the claws 17 of the beam 16 is related. In this case, any other structure can be adopted, and the fins 7 and the claws 17 can also have an appropriate shape.

[0022]

As described above, according to the present invention, since the compost fermenter is formed in a multistage manner, the charged mixture is
After fermenting according to the fermentation stage in each stage, it is dropped and transferred to the lower stage by the rotary transfer device, therefore the fermentation proceeds in one fermentation tank, and it is not necessary to transfer it to another tank depending on the fermentation stage. In addition, since the stirring and mixing are performed at the same time as the transfer, it is not necessary to mix the mixture in the entire fermentation tank, and the running cost can be reduced. Further, since the machine is dropped and transferred, the machine is not overloaded, and the machine durability is improved.

Further, since the fermenter according to the present invention is formed in a multi-stage manner, the raw materials can be continuously charged, and the aeration device or the like can be controlled at each stage, which facilitates automatic operation and facilitates fermentation. Optimal aeration can be performed at each stage according to the progress, so fermentation efficiency is good, fermentation time is short, and productivity is improved.

In addition, by venting at each stage, it is possible to increase the thickness of the body stack, which increases the filling rate of the mixture. Further, since each stage is agitated and mixed by the rotary transfer device, the rate of adhering the mixture to the aeration pipe is reduced, and the productivity is further improved.

Since the compost fermenter is formed in a vertical multi-stage type, the installation area can be reduced as compared with the conventional fermenter. Also, because it is formed in multiple stages, it is not necessary to transfer it to another tank depending on the progress of fermentation, so it is possible to have a closed structure, it is easy to keep warm, and it is possible to prevent odor leakage,
The environment around the fermenter can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of the inside of a compost fermenter according to the present invention.

FIG. 2 is a perspective view showing a ventilation device used in the present invention.

FIG. 3 is a partial perspective view of the rotary transfer device according to the present invention.

FIG. 4 is a schematic cross-sectional view showing an installed state of the compost fermenter according to the present invention.

FIG. 5 is a plan view showing a beam and a rotation shaft used in the present invention.

FIG. 6 is a schematic perspective view of a conventional compost fermenter.

[Explanation of symbols]

 1 Fermenter 1a Fermenter upper 1b Fermenter lower 1c Fermenter lowest 2 Fermenter 3 Open / close cover 4 Ventilator 5 Rotary transfer device 6 Rotating shaft 7 Fin 8 Ventilation duct 9 Exhaust duct 10 Vent pipe 11 Exhaust pipe 12 Small Hole 13 Support rod 14 Belt conveyor 15 Mixture 16 Beam 17 Claw 18 Turning device

Claims (3)

[Claims] 1. A compost fermenter in which a ventilator for ventilating a stored mixture is installed, wherein the ventilator of the fermenter is formed in multiple stages, and a rotary transfer device is provided below the ventilator of each stage. A compost fermenter characterized by being provided. 2. The compost fermenter according to claim 1, wherein the rotary transfer device comprises a rotary shaft and fins attached to the rotary shaft. 3. A plurality of the rotary transfer devices are arranged below a ventilation device of each stage, and the mixture is sequentially transferred from the upper stage to the lower stage by intermittent drive of the rotary transfer device. The compost fermenter described.