JPH072590Y2 - Composting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composting device for fermenting a dehydrated cake of excess sludge produced by wastewater treatment to make it into a fertilizer.

Conventional technology In this type of conventional composting device, a dehydrated cake and a return compost that diverts a part of the product are dropped into the tank from the upper part of the fermentation tank, and the oxygen required for aerobic fermentation is placed in the fermentation tank. By blowing air as a source, the dehydrated cake was fermented to be fertilized, and the fertilized product was taken out of the tank from the production take-out hopper connected to the lower end of the fermentation tank. The fermenter and the product take-out hopper are integrally connected, and the whole is supported by the load cell, and the weight of the product is measured by measuring the total weight of the load cell.

Problems to be solved by the invention By the way, the amount of return compost supplied is
It has a very significant influence on the water content adjustment of the dehydrated cake as a raw material and the seeding of the bacteria on the dehydrated cake.
However, in the above-mentioned conventional configuration, there is a problem that it is difficult to perform fermentation in the best condition because the weight of only the returned compost cannot be measured.

An object of the present invention is to improve a conventional composting device and solve such a problem.

Means for Solving the Problems In order to achieve the above object, the composting device of the present invention feeds the dehydrated cake of excess sludge produced by wastewater treatment into the tank from the upper part of the fermentation tank to ferment it and fertilize it. In the composting device that takes out the product from the product take-out hopper connected to the lower end of the fermenter to the outside of the tank, the lower end of the fermenter and the product take-out hopper are elastically connected, and the product take-out hopper is supported by a load cell. is there.

In the above-mentioned configuration of the present invention, since the lower end of the fermenter and the product unloading hopper are extendably connected to separate the loads of both, and the product unloading hopper is supported by the load cell, the load cell is the product unloading hopper only. Separate from the fermentor and weigh. Therefore, it is possible to separately measure the amount of the product and the amount of the returned compost taken out, and it becomes possible to perform fermentation in the best condition by supplying an appropriate amount of the returned compost.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

The composting device of this embodiment is, as shown in the figure, a fermenter 1
The product take-out hopper 3 is connected to the lower end of the product via the telescopic body 2, and the conveyor device 4 is connected to the fermenter 1 and the product take-out hopper 3.

The fermenter 1 is a vertical closed container, and is provided with a dehydrated cake supply port 5 at the top, a disperser 6 inside, and a damper 7 at the bottom, and an exhaust pipe 8 is connected to the top. A crusher 9 is provided inside the dehydrated cake supply port 5. The crusher 9 is for crushing the dehydrated cake and the returning compost to be fed into the fermenter 1, and is a pair of rotating drums meshing with each other via a plurality of crushing blades 10 provided on the outer circumference.
It consists of 11. The disperser 6 uniformly disperses the fermentation layer in the fermenter 1, and a plurality of arms 13 are radially attached to the lower end of a vertical shaft 12 rotatably supported on the top of the fermenter 1. And is driven by the motor 14.
The damper 7 supports the fermentation layer, is provided with a plurality of blades 15 having a large number of ventilation holes, and is opened and closed by a cylinder 16. The exhaust pipe 8 discharges gas and the like in the fermentation tank 1 to the atmosphere, has a valve 17 in the middle, and the downstream side communicates with the atmosphere through a cleaning / deodorizing device.

The telescopic body 2 is made of vinyl chloride bellows and the like, and the fermenter 1 and the product taking-out hopper 3 are connected so as to be able to extend and contract to separate the loads of both.

The product take-out hopper 3 has two hopper parts 18,
An air supply pipe 19 and an air escape pipe 20 are connected to the upper portion, a compost discharger 21 is provided at the outlet of each hopper portion 18 and a heater 22 is provided on the outer periphery, and is supported by a load cell 23. The air supply pipe 19 supplies air, which is an oxygen source required for aerobic fermentation, into the fermenter 1, and has a valve 24 and a flow meter 25 in the middle. The air release pipe 20 releases the air in the product take-out hopper 3 into the fermenter 1 when the product in the fermenter 1 is dropped into the product take-out hopper 3, and has a valve 26 in the middle. The upper part of the take-out hopper 3 and the upper part of the fermenter 1 are connected. The compost discharger 21 is a conveyor that sends out the product dropped in the product take-out hopper 3 to the outside. The heater 22 heats the product taking-out hopper 3 to prevent the moist air in the fermenter 1 from condensing on the inner surface of the product taking-out hopper 3, and an electric heater or the like is used. The load cell 23 is for measuring the weight of the product and the returned compost dropped in the product take-out hopper 3.

The conveyor device 4 includes a conveyor 27 for conveying raw materials, and a damper 28 opened and closed by a cylinder 28 in the middle of the conveyor 27.
A compost conveying conveyor 30 connected via 29, a raw material feeding conveyor 31 connected to the outlet of the conveyor 27,
A raw material / product switching conveyor 32 is connected to the outlet of the conveyor 31, and a product transporting conveyor 35 connected to the middle of the conveyor 32 via a switching valve 34 opened / closed by a cylinder 33. The upstream side of the conveyor 30 is connected to the outlet of the compost discharger 21, and the outlet of the end of the conveyor 32 is connected to the dehydrated cake supply port 5 of the fermenter 1. A screw conveyor or a case conveyor is suitable as the type of each conveyor.

Next, the operation of the above configuration will be described.

At the same time as supplying the dehydrated cake of surplus sludge (including a mixture with the secondary residue) 36 generated as a result of wastewater treatment to the conveyor 27 as a raw material, a part of the product in the product take-out hopper 3 is returned as a compost 37 and is a compost discharger. 21, via conveyor 30 and damper 29 into the middle of conveyor 27. At that time, the supply amount of the return compost 37 is measured by the load cell 23 and adjusted to an appropriate amount corresponding to the supply amount of the dehydrated cake 36. This is possible because the load between the fermenter 1 and the product take-out hopper 3 is separated by the telescopic body 2. The dehydrated cake 36 and the returned compost 37 supplied to the conveyor 27 are supplied to the dehydrated cake supply port 5 of the fermenter 1 from the end outlet of the conveyor 32 with the switching valve 34 closed via the conveyor 31 and the crusher. 9
After being crushed by the method, it is dropped on the closed damper 7 in the fermentation tank 1 and uniformly dispersed by the disperser 6 to form the fermentation layer 38. In the fermentation layer 38, the return compost 37 seeds the dehydrated cake 36 with fermentation bacteria, and
Adjust the water content of. On the other hand, fermentation air 39 is blown into the product take-out hopper 3 from the air supply pipe 19. The supply amount of the fermentation air 39 is adjusted to an appropriate amount by the flow meter 25, passes through the ventilation holes of the blades 15 from below the damper 7, and passes through the fermentation layer 38.
It is blown inside and supplies the oxygen required for fermentation. Thus, the fermented layer 38 is fermented and fertilized. Gas, water vapor, and excess fermentation air 39 generated during fermentation are discharged into the atmosphere after being washed and deodorized through the exhaust pipe 8 on the way. Further, the heater 22 heats the product taking-out hopper 3 to prevent the moist air in the fermentation tank 1 from being condensed on the inner surface of the product taking-out hopper 3. When fermentation is complete,
The damper 7 is opened and the fertilized product 40 is dropped into the product take-out hopper 3. At that time, the air in the product take-out hopper 3 is released from the air escape pipe 20 into the space above the fermentation layer 38 in the fermentation tank 1. The product 40 dropped in the product take-out hopper 3 is conveyed from the composting ejector 21 to the conveyor 32 via the conveyor 30, the damper 29, and the conveyors 27 and 31, and via the switching valve 34 opened from the middle of the conveyor 32. Then, it is conveyed by the conveyor 35 to a product storage facility or the like.

As described above, in the composting device of this embodiment,
Since the fermenter 1 and the product taking-out hopper 3 are connected to each other by the telescopic body 2 so as to be able to expand and contract to separate the loads of the two, the load cell 23 measures only the load of the product taking-out hopper 3. Therefore, it is possible to separately measure the amount of the product 40 and the amount of the returned compost 37 taken out.By measuring the amount of the returned compost 37 supplied by the load cell 23 and adjusting it to an appropriate amount corresponding to the amount of the dehydrated cake 36 supplied. However, it is possible to carry out fermentation in the best possible condition.

Effect of the Invention As described above, in the present invention, the lower end of the fermenter and the product unloading hopper are extendably connected, and the product unloading hopper is supported by the load cell. Only the chisel is weighed separately from the fermentor load. Therefore, the amount of the product and the amount of the returned compost taken out can be measured separately, so that the fermentation can be performed in the best condition by adjusting the supply amount of the returned compost to an appropriate amount.

[Brief description of drawings]

FIG. 1 is a sectional view of a composting device showing an embodiment of the present invention. 1 ... Fermenter, 3 ... Product take-out hopper, 23 ... Load cell, 36 ... Dehydrated cake, 40 ... Product.

Claims (1)

[Scope of utility model registration request] 1. A compost for extracting a dehydrated cake of excess sludge produced by wastewater treatment from the upper part of a fermentation tank into the tank for fermentation, and fertilizing the product to the outside of the tank from a product hopper connected to the lower end of the fermentation tank. In the apparatus, a composting device is characterized in that a lower end of a fermenter and a product taking-out hopper are extendably connected, and the product taking-out hopper is supported by a load cell.