JPH04362080A - Treatment of organic waste - Google Patents

Abstract

PURPOSE:To allow the sanitary and efficient fermentation treatment of org. waste without splashing malodors and stains to the ambient and without requiring the separate treatment of stained bags at the time of charging the org. waste, such as crude refuse, into a fermentation chamber. CONSTITUTION:The org. waste is put into biodegradable plastic bags 30 having biodegradability and these biodegradable plastic bags 30 are put into the fermentation chamber provided with a crushing and agitating machine. While the biodegradable plastic bags are crushed by operating the crushing and agitating machine, the org. waste is agitated and the biodegradable plastic bags and the org. waste are fermented by microorganisms. The bags and org. waste are thus treated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention collects organic waste such as garbage using a biodegradable plastic bag, and then puts the organic waste together with the biodegradable plastic bag into a fermenter for fermentation. This invention relates to a method for treating organic waste by composting and composting.

0002

2. Description of the Related Art A large amount of kitchen waste, ie food waste, produced from the kitchens of restaurants, school lunch centers, etc., is subjected to a fermentation process in which it is aerobically fermented and turned into compost.

[0003] In order to efficiently ferment such a large amount of food waste, various types of fermenters have been used, such as static or multistage fermenters, horizontal rotary fermenters, and fermenters with stirring arms. There is.

0004

[Problems to be Solved by the Invention] Generally, the fermentation tank for fermenting food waste is installed in a location away from the kitchen, etc. that takes out the food waste, so the food waste taken out from the kitchen, etc. The waste is placed in garbage bags made of plastic film such as vinyl chloride, and then these garbage bags are transported to fermenters in other locations.

[0005] When putting food waste into the fermentation tank, since this type of waste bag is not fermented, a person must take out the food waste from the waste bag and put it into the fermentation tank. Therefore, when food waste is put in, bad odors and dirt are scattered around the fermenter, worsening the environment around the fermenter, and there are problems such as the need to dispose of dirty used garbage bags separately. Ta.

[0006] The present invention was made to solve the above-mentioned problems, and when putting organic waste such as food waste into a fermentation tank, it does not scatter foul odors and dirt around it, and separates the dirty bags. It is an object of the present invention to provide a processing method capable of hygienically and efficiently fermenting organic waste without the need for processing.

[0007]

[Means for Solving the Problems] To this end, the organic waste treatment method of the present invention involves placing organic waste in a biodegradable plastic bag, and crushing the biodegradable plastic bag. The organic waste is put into a fermentation tank equipped with an agitator, and the crushing agitator is activated to crush the biodegradable plastic bags while agitating the organic waste.The biodegradable plastic bags and organic waste are fermented by microorganisms. configured to process.

[0008]

[Operation/Effect] Organic waste such as kitchen garbage is placed in a biodegradable plastic bag, and the biodegradable plastic bag is directly put into the fermenter. For this reason, compared to putting food waste in a regular plastic bag and disposing of it, you can put the food waste into the fermenter without taking it out of the bag, and put it in the biodegradable plastic bag. It can be disposed of without scattering odor or dirt around the garbage bag, and there is no need to separately dispose of dirty garbage bags.

Inside the fermenter, a crushing agitator is operated to crush the biodegradable plastic bags, the organic waste is appropriately agitated, and the temperature and humidity are appropriately controlled to make the organic waste aerobic. Fermentation is accelerated and the organic waste is composted in the fermenter along with biodegradable plastics.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 1 shows a longitudinal sectional view of an organic waste fermenter, and FIG. 2 shows its AA sectional view. 1 is a storage tank in a fermenter, and insulation material 2 is provided on the outer surface of the side wall and bottom wall.
are arranged so as to surround the heat insulating material 2, and a stainless steel outer plate 3 is provided around the outer periphery of the heat insulating material 2.

The upper part of the storage tank 1 is closed by a lid 13, and an input port 14 is provided in a part of the lid so that it can be opened and closed. Further, a take-out port 15 is formed in the bottom side wall of the storage tank 1 so as to be openable and closable over the entire width of the storage tank 1 .

At the bottom of the storage tank 1, a plurality of lateral screw conveyors 16 constituting a crushing agitator are arranged horizontally in parallel over substantially the entire surface of the bottom plate toward the take-out port 15. The shaft of each screw conveyor 16a is supported by a bearing at the side wall portion, and its ends protrude outside. Gears 16b are fixed to these protruding ends. Adjacent gears 16b mesh with each other and are used for driving (not shown). It is linked to the motor via gears, etc.

This lateral screw conveyor 16 has right-handed screw blades and left-handed screw blades arranged every other screw, and by rotating them in opposite directions, organic matter is integrally transported toward the takeout port or Transport in the opposite direction. Further, this lateral screw conveyor 16 uses a cut screw having cutting blades provided at the edge of the screw to crush biodegradable plastic bags containing organic waste.

Furthermore, on one side wall of the storage tank 1,
A plurality of vertical screw conveyors 20 constituting a crushing agitator are installed vertically. The vertical screw conveyor 20 is arranged substantially vertically along the side wall opposite to the take-out port 15, and is erected upward from the base of the horizontal screw conveyor 16. Vertical screw conveyor 2
Each of the shafts 20a of 0 is supported by bearings on the lid body 13 and the bottom plate, and its upper end protrudes upward, and gears 20b are fixed to the protruding ends of these shafts 20a, and adjacent gears 20b mesh with each other. It is linked to a drive motor (not shown) via gears or the like.

This vertical screw conveyor 20 has right-handed screw blades and left-handed screw blades arranged every other screw, and by mutually rotating them in opposite directions, the organic matter at the bottom is pushed up and conveyed. Further, this vertical screw conveyor 20 also uses a cut screw with cutting blades provided at the edge of the screw to crush biodegradable plastic bags containing organic waste.

[0017] It is also possible to arrange a partition plate vertically near the inside of the vertical screw conveyor 20 to create a vertical conveyance path to facilitate conveyance of the organic matter.

An air supply pipe 10 is disposed horizontally above the cross-feeding screw conveyor 16 in the storage tank, and this air supply pipe 10 is connected to the air supply side of an external blower.
Air is supplied to the bottom of the tank. If necessary, a heater is connected to the air supply side of the blower, and the supply air is heated and supplied in winter.

Further, above the horizontal screw conveyor 16 close to the vertical screw conveyor 20 in the storage tank, rotary vanes 25 for preventing arching are disposed in a horizontal direction. The rotary blade 25 for preventing arch phenomenon is connected to a rotary shaft 25 that is rotatably supported horizontally via a bearing.
A, a large number of cross-shaped blades 25b are attached at intervals, and each blade 25b is formed by bending the tip of a cross-shaped blade. The tip of the rotating shaft 25a protrudes from the storage tank 1 to the outside, and a drive motor 26 is linked thereto via a sprocket and a chain.

On the other hand, as a bag for storing organic waste such as garbage, a biodegradable plastic bag 30 made of biodegradable plastic that can be decomposed by microorganisms is used (FIG. 3).

[0021] Examples of this biodegradable plastic include a polyester-based polymer material made by fermenting sugar made from agricultural products with microorganisms, a resin made by imparting biodegradability to a general-purpose plastic, For example, a synthetic resin in which a pyridinium group is introduced into polymethyl methacrylate can be used.

[0022] Organic waste such as food scraps taken out from the kitchen etc. is placed in a biodegradable plastic bag 30, and the bag and the bag are introduced into the storage tank 1 of the fermenter through the input port 14. At the same time, an appropriate amount of fermenting bacteria is added.

[0023] In this way, the biodegradable plastic bag 30 containing organic waste such as food scraps is put into the storage tank 1 as it is, so it can be easily removed without scattering odor or dirt around the fermentation tank. can be processed.

After the biodegradable plastic bag 30 is loaded, the horizontal screw conveyor 16 is rotated in the opposite direction (to convey in the direction opposite to the take-out port 15), and at the same time, the vertical screw conveyor 20 is rotationally driven to transport the stored items upward. By rotating the horizontal screw conveyor 16 and the vertical screw conveyor 20, the biodegradable plastic bags 30 in the storage tank 1 are crushed, and the organic waste inside the bags is removed from the storage tank 1.
diffused within.

[0025] The input organic waste starts to ferment in a day to a day and a half, and the internal temperature rises from 45°C to 65°C due to the fermentation heat.
As the temperature increases, the organic matter gradually shrinks in volume as it ferments.

[0026] As garbage is thrown in every day, the organic waste in the tank gradually accumulates, and the organic matter at the bottom is compressed. air is sent into the tank from the air supply pipe 10, and at this time, the horizontal screw conveyor 16 is rotated in the opposite direction (to convey in the direction opposite to the take-out port 15), and at the same time, the vertical A feed screw conveyor 20 is rotationally driven to transport the organic matter upward.

The organic waste solidified at the bottom of the storage tank 1 is crushed by the horizontal screw conveyor 16 and sent to the base of the vertical screw conveyor 20.
Furthermore, it is conveyed upward by the vertical screw conveyor 20 and returned to the upper center.

By repeating these operations, the organic waste in the tank flows in the direction of the arrow as a whole, as shown in FIG. The entire waste is supplied with air and aerobic fermentation takes place uniformly.

[0029] At the same time, the rotary vane 2 for preventing arch phenomenon
5 is rotated counterclockwise in FIG. 1 at low speed.

[0030] If the screw conveyor is driven only, an immobile layer of organic waste is likely to be formed in the area directly above the horizontal screw conveyor 16 near the vertical screw conveyor 20, and that area solidifies, causing an arch phenomenon. Although it is easy to do so, by rotating the rotary vane 25 for preventing arching phenomenon, solidification in that part is prevented, arching phenomenon is inhibited, and the entire organic waste is well stirred.

[0031] When the fermentation of the organic matter is completed,
The take-out port 15 at the bottom is opened, and the traverse screw conveyor 16 is driven to rotate in the unloading direction, and the rotary blade 25 for preventing arching phenomenon is rotated clockwise in FIG. 1.

[0032] As a result, the composted organic matter is sent out from the outlet 15. Since the lateral screw conveyor 16 is disposed on the entire bottom plate toward the take-out port 15, the organic matter can be carried out in a short time without leaving anything behind.

[0033]

As explained above, according to the organic waste treatment method of the present invention, organic waste is placed in a biodegradable plastic bag, and the biodegradable plastic bag is shredded. The organic waste is put into a fermentation tank equipped with an agitator, and the crushing agitator is activated to crush the biodegradable plastic while stirring the organic waste, and the biodegradable plastic bags and organic waste are fermented by microorganisms. As before,
Compared to placing organic waste such as food waste in plastic bags and disposing of it, the food waste can be placed into the fermenter without taking it out of the bag, and the biodegradable plastic bag remains in the fermenter. It is possible to hygienically ferment organic waste such as food waste without scattering foul odors or dirt around it, and without having to separately dispose of dirty garbage bags.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a fermenter.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a perspective view of a biodegradable plastic bag.

[Explanation of symbols]

1-Accommodation tank, 16-Transverse screw conveyor (crushing agitator), 20
- Vertical screw conveyor (crushing agitator), 30 - Biodegradable plastic bags.

Claims (1)

[Claims] Claim 1: Put organic waste into a biodegradable plastic bag, put the biodegradable plastic bag into a fermentation tank equipped with a crushing agitator, and operate the crushing agitator. A method for treating organic waste, characterized in that the organic waste is stirred while crushing the biodegradable plastic bag, and the biodegradable plastic bag and the organic waste are fermented and treated by microorganisms.