JP3549001B2 - Organic waste treatment system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic waste treatment system that decomposes organic waste (eg, organic sludge) with bacteria.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2001-334239 discloses a fermentation treatment apparatus for kitchen garbage and the like using wood chip chips for moisture adjustment and air permeability in the fermentation treatment. In this device, organic waste such as garbage is crushed by a crusher, and then fed into a circular fermentation tank (dry decomposition treatment tank) by pressure and stirred with a stirrer together with wood chip in the fermentation tank. Ferment. This stirrer, by circulating the whole while circulating a vertical endless conveyor having a large number of stirring blades, stirs and mixes organic waste such as garbage and wood chip with the center of the fermenter while mixing. Move slowly. The mixture that has moved to the center of the fermenter is carried out by a carry-out conveyor at the bottom of the fermenter, and is sieved by a sieve into powdery and granular processed materials (decomposed organic waste) and wood chip. The sieved wood chips are returned to the fermenter by a reduction conveyor and used for circulation.
[0003]
[Problems to be solved by the invention]
However, although this fermentation treatment apparatus uses wood chips, the purpose is to ensure moisture control and air permeability in the fermentation treatment, and furthermore, by stirring this together with organic waste in the fermentation tank. Mixed. Therefore, fermentation (decomposition processing) takes a long time, and even if the wood chip is heated by fermentation heat, it absorbs a large amount of water and ferment itself, so that it deteriorates violently. In order to stably maintain the properties, a large amount of wood chip chips must be replenished, which increases running costs. Also, when sieving wood chips with a sieving machine, the wood chips are decayed, so it is difficult to sieve with organic waste that has been decomposed and turned into powder and granules, and clogging occurs in the sieving machine. There's a problem. Furthermore, in the case of sieving in a fermentation tank, separation is difficult because the temperature in the tank is high, the water content of the processed product is high, and the moisture of the fermentation bacteria itself is high.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide an organic waste treatment system capable of economically dissolving large amounts (for example, 10 tons or more per day) of organic waste at a high decomposition rate by disinfection and economically in view of such conventional technology. To provide.
[0005]
[Means for Solving the Problems]
The present invention is based on the fact that when a large amount of organic waste (sludge) is decomposed, it is often brought into a dewatered cake. After mixing the bacterial chips carrying the same, the mixture is stirred in a decomposition treatment tank and disintegrated by sterilization, and the bacterial chips subjected to the treatment are sieved from the decomposed organic waste and recycled. It was made.
[0006]
That is, the organic waste treatment system of the present invention has a built-in pusher, a scraper conveyor that circulates up and down at one end, and pushes the organic waste input as a dewatered cake with the pusher and pushes the organic waste downward with the scraper conveyor. The raw material hopper that feeds a fixed amount to each of the raw materials, the chip hopper that transports the bacterial chips carrying sterilization by a conveyor, and the organic waste that is discharged from the raw material hopper and the bacterial chips that are transported from the chip hopper are mixed by a fixed amount. A mixing machine that carries in and mixes it with a conveyor for carrying in a machine, and a decomposition process with a roof in which the mixture mixed by this mixer is carried in from above by a conveyor for carrying in a decomposition treatment tank, and disintegrated by disinfection while stirring. The tank and the treated material discharged from this decomposition treatment tank are introduced, and And goods and bacteria chip and the sieving sieving machine is made and a chip return conveyor for returning the bacteria chips were sieved to Chippuhoppa.
[0007]
As the decomposition treatment tank, the vertical endless conveyor having a large number of stirring blades is circulated while being swirled to move the mixture while stirring, and the decomposition treatment tank is carried in from the top by a conveyor for carrying in the decomposition treatment tank. It is preferable to incorporate a distribution conveyor for distributing and dispersing the mixture, an air supply device for supplying outside air from the bottom, and a carry-out conveyor for carrying out the processed material from the bottom.
[0008]
Further, as the chip hopper, it is preferable to have a scraper conveyer built in at one end and a scraper conveyer circulating up and down at one end, to convey the bacterial chips by the conveyer and to send out a predetermined amount by the scraper conveyer downward.
[0009]
Regarding the exhaust gas from the decomposition tank, the exhaust gas from the decomposition tank was brought into contact with acidic shower water in a pickling neutralization tower to neutralize the ammonia, and then the odor sucked from the pickling neutralization tower was further removed from the soil. It is good to deodorize the soil with a deodorizer.
[0010]
In each of the raw material hopper and the chip hopper, a constant amount is sent downward by adjusting the rotation speed of the scraper conveyor, so that the mixing ratio can be always kept constant.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 shows a configuration of an organic waste treatment system according to the present invention and a flow of the treatment. This organic waste treatment system includes, as main components, a raw material hopper 1, a chip hopper 2, a mixer 3, a decomposition tank 4, a pickling neutralization tower 5, a soil deodorizing device 6, and a sieving machine 7. .
[0013]
The raw material hopper 1 is constructed below the ground surface so that the organic waste, which has been transported by the truck 8 as a dehydrated cake, can be directly input from the truck 8, and the chip hopper 2 is also transported by the truck 9. Similarly, the bacteria chip (sterilized carrier) is constructed at a lower level than the ground surface so that it can be introduced from the truck 9 as it is.
[0014]
The raw material hopper 1 has a built-in pusher 10 and a scraper conveyor 11 that circulates up and down at one end. The upper lid 12 is opened, and the organic waste (dehydrated cake) input from the input port is pressed by the pusher 10. The scraper conveyor 11 scrapes it down. The processing weight of the raw material hopper 1 is, for example, 18 tons / day. The scraped organic waste is put into the mixer 3 by the screw conveyor 13 which is a conveyor for carrying the mixer. By adjusting the propulsion speed of the pusher 10 and the rotation speed of the screw conveyor 13, it is possible to send out a certain amount of organic waste as a dewatered cake.
[0015]
The chip hopper 2 has a built-in conveyor (belt conveyor) 14 at its lower part, and has a scraper conveyor 15 circulating up and down at one end. The upper lid 16 is opened, and the bacterial chip input from the inlet is fed out and conveyed by the conveyor 14. And scrape it down with a scraper conveyor 15. The processing weight of the chip hopper 2 is, for example, 18 tons / day, similarly to the raw material hopper 1. The scraped-out bacterial chips are introduced into the mixer 3 by the screw conveyor 17 which is a conveyor for carrying the mixer. By adjusting the transport speed of the feed conveyor 14 and the rotation speed of the screw conveyor 17, the bacterial chips can be sent out by a fixed amount.
[0016]
A bacterial chip is a chip made of a material that does not ferment, such as a resin or a ceramic, which is sterilized and can be used repeatedly.
[0017]
The mixing machine 3 mixes and discharges the organic waste and the bacterial chips input from the screw conveyors 13 and 17 at a substantially equal weight ratio. The discharged mixture is conveyed upward by the conveyor 18 for carrying in the decomposition treatment tank, and is carried into the decomposition treatment tank 4 from above.
[0018]
The decomposition processing tank 4 is a dome-shaped (with a roof) circular tank having a double cylindrical wall, and includes a distribution conveyor 19 at an upper portion, a stirrer 20 below the distribution conveyor 19, and an air supply device 21 and an unloading conveyor 22 at a bottom portion. I have. As an example of the specification of the decomposition treatment tank 4, the diameter is about 20 m, the effective internal volume is 565 m ³ , and the maximum temperature is 65 to 80 ° C. due to the heat of fermentation for disinfection. For this reason, when sent to the center of the decomposition treatment tank 4, the water content becomes 20 to 30%, and subsequent sieving can be easily performed.
[0019]
The distribution conveyor 19 distributes and distributes the mixture carried in from the upper part by the conveyor 18 for carrying out the decomposition treatment tank in the radial direction of the decomposition treatment tank 4.
[0020]
The stirrer 20 circulates a vertical endless conveyor 23 in which a number of stirring blades are provided at intervals vertically, while circulating the same so that the mixture in the decomposition treatment tank 4 is gradually stirred at the bottom. To the center of the The specific structure is described in Japanese Patent No. 3194141 previously proposed by the present inventor.
[0021]
The air supply device 21 sends the fresh air from the external blower 24 from a large number of nozzles in an upward direction over substantially the entire bottom of the decomposition treatment tank 4 in an average manner.
[0022]
The mixture of the organic waste and the bacterial chip is stirred by the stirrer 20 while the outside air is supplied from the bottom in this way, and the organic waste is decomposed into moisture, carbon dioxide, and ammonia by sterilization.
[0023]
In the case of this example, the stirrer 20 moves the mixture of the organic waste and the bacterial chips to the center of the decomposition treatment tank 4 by circulating the whole in the forward direction while circulating the vertical endless conveyor 23. The forward feeding and the reverse movement of moving the whole to the peripheral wall portion of the decomposition treatment tank 4 by turning the whole body in the reverse direction are alternately performed on a daily basis, and by repeating this for several days, most of the organic waste is reduced. When it disappears, only forward feeding is performed twice a day and collected in the center of the bottom of the decomposition treatment tank 4.
[0024]
The unloading conveyor 22 is installed below the bottom of the decomposition processing tank 4 and decomposes the organic matter that has been subjected to the decomposition processing including the bacterial chips collected at the center of the bottom of the decomposition processing tank 4 as described above. It is conveyed to the outer peripheral part of the tank 4 and is carried out therefrom.
[0025]
The decomposition-treated organic matter including the bacterial chips carried out from the decomposition treatment tank 4 is carried into the sieving machine 7 by the sieving machine carry-in conveyor 25.
[0026]
The sieving machine 7 sieves the decomposed organic matter and the bacterial chips. The sieved bacterial chips are returned to the chip hopper 2 by a chip return conveyor 26 such as a closed bucket conveyor, and are circulated. The sieved and decomposed organic matter is packed in a bag by the bag packing device 27, and then placed on a transport pallet and stored in a storage place. Residues that have not been sieved by the sieving machine 7 are collected by a residue hopper 28, and dust generated in the sieving machine 7 is collected by an external dust collector.
[0027]
On the other hand, the exhaust gas from the center of the ceiling of the decomposition tank 4 is sucked into the pickling neutralization tower 5 through the exhaust duct 29. In this example, the acid pickling neutralization tower 5 is composed of two identical towers connected in two stages. In each case, the sulfuric acid from the sulfuric acid tank 30 is supplied to the storage tank 31 and the storage tank 31 is supplied thereto by the PH controller. The acidic water is circulated while being sprinkled internally as acidic shower water by the pump 32, thereby neutralizing the ammonia in the exhaust gas from the decomposition treatment tank 4. The treatment is performed in two stages in the treatment tank 4.
[0028]
Further, the air is taken from the decomposition treatment tank 4 by the deodorizing intake fan 33 and sent to the soil deodorizing device 6, where the soil is deodorized. The soil deodorizing device 6 is a device in which a ceramic charcoal layer 36 is formed on a soil layer 34, and sewage generated here is stored in a sewage pit 36. The sewage and the sewage in the pickling neutralization tower 5 are sent to a sewage treatment facility to be separately treated.
[0029]
【The invention's effect】
As described above, the present invention uses an organic waste made into a dewatered cake as a raw material, puts it into a raw material hopper, and presses the raw material hopper with a pusher in the raw material hopper to adjust the rotation speed of the scraper conveyor to thereby maintain a constant value. Dispense by volume into a mixer, mix it with the sterilized bacterial chip, mix it in a digestion tank and disinfect it by sterilization. Since the treated organic waste is sieved and recycled, a large amount of organic waste can be economically decomposed at a high decomposition rate.
[0030]
The invention according to claim 2 is that the mixture of the organic waste and the bacterial chips is distributed and sprayed from above in the decomposition treatment tank, and the mixture is stirred by the stirrer and sent from below by the air supply device. Since it is moved and carried out from the bottom of the decomposition treatment tank, the decomposition treatment can be performed efficiently.
[0031]
The invention according to claim 3 is that the bacterial chips are conveyed in a chip hopper by a sending-out conveyor and sent downward by a fixed amount by a scraper conveyor, so that the bacterial chips are synchronized with the sending of the organic waste as a dehydrated cake, It can be continuously charged into a mixer and mixed at a desired ratio.
[0032]
The invention according to claim 4 is that, after the exhaust gas from the decomposition treatment tank is brought into contact with acidic shower water in a pickling neutralization tower to neutralize ammonia, the odor sucked from the pickling neutralization tower is further deodorized to soil. Since the soil is deodorized by the device, the deodorizing treatment can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an organic waste treatment system according to the present invention and a flow of the treatment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Raw material hopper 2 Chip hopper 3 Mixer 4 Decomposition tank 5 Pickling neutralization tower 6 Soil deodorizer 7 Sieving machine 8.9 Truck 10 Pusher 11 Scraper conveyor 12 Top lid 13 Screw conveyor 14 Delivery conveyor 15 Scraper conveyor 16 Top lid 17 Screw Conveyor 18 Conveyor for disassembling treatment tank 19 Distribution conveyor 20 Stirrer 21 Air supply device 22 Conveyor for unloading 23 Vertical endless conveyor 24 Blower 25 Conveyor for sieving machine 26 Conveyor for chip return 27 Bagging device 28 Residue hopper 29 Exhaust Duct 30 Sulfuric acid tank 30 Storage tank 32 Pump 33 Deodorizing intake fan 34 Soil layer 36 Ceramic coal layer

Claims (4)

A raw material hopper that has a built-in pusher and a scraper conveyor that circulates up and down at one end, pushes organic waste input as a dewatered cake with a pusher, and sends out a fixed amount to the lower side with a scraper conveyor,
A chip hopper for carrying out the bacteria chips carrying sterilization by a conveyor,
A mixer that mixes the organic waste that has been sent out from the raw material hopper and the bacterial chips that have been unloaded from the chip hopper by a predetermined amount, respectively, by a mixer loading conveyor.
A decomposition treatment tank with a roof that carries the mixture mixed by this mixer from the upper part by a conveyor for carrying in the decomposition treatment tank and disintegrates by disinfection while stirring,
A sieving machine that introduces the treated material discharged from the decomposition treatment tank and sieves the decomposition-treated organic matter and the bacterial chips,
An organic waste treatment system comprising: a chip return conveyor for returning the sieved bacterial chips to the chip hopper. The decomposition tank is a stirrer that moves while stirring the mixture by rotating the whole while circulating a vertical endless conveyor having a large number of stirring blades, and a mixture that is carried in from the top by a conveyor for carrying the decomposition processing tank. The organic waste according to claim 1, further comprising a distribution conveyor for distributing and dispersing the air, an air supply device for supplying outside air from the bottom, and a carry-out conveyor for carrying out the processed material from the bottom. Processing system. The chip hopper has a built-in feeder conveyor, a scraper conveyor that circulates up and down at one end, and transports the bacterial chips by the feeder conveyor and sends out the bacteria chips by the scraper conveyor by a fixed amount. Organic waste treatment system according to 1. It further comprises a pickling neutralization tower for bringing the exhaust gas from the decomposition treatment tank into contact with the acidic shower water, and a soil deodorizing device for deodorizing the odor sucked from the pickling neutralization tower in the soil. The organic waste treatment system according to claim 1, 2 or 3.

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