JP2000189932A - Device for organic waste treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely destroy organic waste such as garbase, sludge, etc., reduce BOD, COD, solid content and suspended matter. SOLUTION: This device is provided with: a first reaction vessel 10 for receiving a porous microbial treatment medium, water for the treatment (such as raw water to be treated and recycle treated water) and charged organic waste and then alternately performing aerobic fermentation and anaerobic fermentation of the mixture of the received materials in such a way that first the mixture is aerated to subject it to aerobic fermentation for a specified period while agitating it with an agitator 16 and then the aeration and agitation are stopped and thereafter the resulting mixture is subjected to anaerobic fermentation for a specified period; an aeration treatment vessel 30 for aerating the treated water containing organic matter decomposed in the first reaction vessel 10 to perform aerobic fermentation of the treated water; a settling treatment tank 40 for settling and separating inorganic matter, sand, etc., in the aeration-treated water containing organic matter treated in the aeration treatment vessel 30; and a second reaction vessel in which a porous microbial treatment medium is placed at the bottom so as to cover the bottom and which is used for subjecting a supernatant liquid containing organic matter taken from the upper layer of the liquid subjected to settling separation treatment in the settling treatment tank 40 to anaerobic fermentation treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic waste treatment apparatus, and more particularly, to garbage discharged from households, restaurants, food factories, etc., and from wastewater treatment facilities such as food factories. The present invention relates to a treatment apparatus for dissolving organic waste such as sludge discharged by bacteria such as soil bacteria.

[0002]

2. Description of the Related Art Conventionally, organic waste such as garbage discharged from general households, restaurants and food factories, and sludge discharged from wastewater treatment facilities such as food factories (hereinafter simply referred to collectively as " Organic wastes) are treated by various treatment methods such as incineration, activated sludge, and composting.

That is, in the incineration method, such organic waste is incinerated using an incinerator such as a fixed-bed incinerator or a rotary kiln incinerator. According to this incineration method, dioxin and carbon dioxide are generated during incineration, which causes air pollution and environmental pollution.In addition, incineration ash is generated, so this must be transported to landfills and disposed of. Instead, transportation costs are incurred and environmental pollution is caused. In addition, this method requires auxiliary fuel such as heavy oil or gas for incineration, which increases the processing cost.

[0004] The activated sludge method is a method in which organic waste is passed through a disposer (pulverizer) to decompose organic waste with activated sludge. In this activated sludge method, only the energy consumed when the microorganisms contained in the activated sludge multiply using the organic waste as a nutrient can reduce the solid content (about 15%), and the efficiency is not good. Further, in this method, it is difficult to keep the microorganisms alive at all times, and when the microorganisms die, they have to be replaced and the operation efficiency is poor. Moreover, most of the remains of the microorganisms contained in the activated sludge, that is, sludge, remain, so that secondary treatment such as incineration or fermentation to compost is required.

[0005] Further, the composting method (composting) is a method in which organic waste is fermented by microorganisms and composted into agricultural fertilizers, horticultural fertilizers and the like. However, in recent years, the number of full-time farmers has been decreasing, and in fact the demand is decreasing. Further, in this composting method, there are some which cannot be treated depending on the types of garbage, sludge, and the like.

[0006] For this reason, Japanese Patent Publication No. 2-34679,
In Japanese Patent Publication No. 2-30760, various types of sludge such as sedimentation sand, first settling tank sludge, sedimentation sludge after sprinkling furnace treatment, excess sludge after activated sludge treatment, anaerobic digestion sludge, aerobic digestion sludge, etc. Aerobic treatment and anaerobic treatment are sequentially and repeatedly repeated over time in a treatment tank containing a treatment medium as a microorganism culture substrate containing, and the biochemical oxygen demand (BOD) in wastewater; Chemical oxygen demand (COD) and SS
A method and a processing apparatus for reducing (solid content, suspended solids) are disclosed.

Further, Japanese Patent Publication No. 3-73358 and Japanese Patent Publication No. 4-10398 disclose various wastewaters such as household wastewater, industrial wastewater, food processing wastewater, etc. as a microorganism cultivation base material including wood chips. And a continuous treatment tank having a stirring function for treating microorganisms in a treatment tank containing the treatment medium.

[0008]

SUMMARY OF THE INVENTION
In Japanese Patent No. 34679 and Japanese Patent Publication No. 2-30760,
Treatment of various types of sludge, such as sedimentation sand, first settling tank sludge, settling sludge after sprinkling furnace treatment, surplus sludge after activated sludge treatment, anaerobic digestion sludge, and aerobic digestion sludge, as a microorganism culture substrate including wood chips In a treatment tank containing a medium, aerobic treatment and anaerobic treatment are sequentially and repeatedly repeated with time, and the biochemical oxygen demand (BOD) and the chemical oxygen demand (CO
Methods and treatment devices for reducing D) and SS (solids, suspended solids) are disclosed.

Japanese Patent Publication Nos. Hei 3-73358 and Hei 4-10398 disclose various wastewaters such as household wastewater, industrial wastewater, food processing wastewater, etc. as a microorganism culture substrate containing woody debris. And a continuous treatment tank having a stirring function for treating microorganisms in a treatment tank containing the treatment medium.

However, all of the above-mentioned methods are intended for those which have a relatively small solid content such as sludge and wastewater, have a small size, and are easily degraded by microorganisms.
Therefore, even if these methods and apparatuses are used as they are, for example, it is intended to treat organic waste such as garbage discharged from general households, restaurants, food factories, and sludge discharged from wastewater treatment facilities such as food factories. However, garbage has a large solid content, a large size, and a wide variety of types, and it is almost impossible to completely eliminate these organic wastes.

The present invention has been made in view of the above-mentioned circumstances, and garbage discharged from general households, restaurants, food factories, etc.
A wide variety of organic wastes such as sludge discharged from wastewater treatment facilities such as food factories are almost completely eliminated, and biochemical oxygen demand (BOD) and chemical oxygen demand (CO
It is an object of the present invention to provide an organic waste treatment apparatus capable of extremely reducing D) and SS (solid content, suspended solids).

[0012]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned objects and objects, and an apparatus for treating organic waste according to the present invention is provided with an organic waste such as garbage and sludge. A treatment device for treating aerobic waste, which contains a porous microorganism treatment medium, treated water, and the input organic waste, and aerobically ferments by aeration while stirring with a stirrer. A first reaction tank configured to perform aerobic fermentation and anaerobic fermentation alternately so as to perform the anaerobic fermentation for a predetermined time while stopping the aeration and stirring while performing for a predetermined time, and An aeration treatment tank for performing aerobic fermentation by aerating treated water containing organic matter decomposed in the first reaction tank, and an inorganic substance contained in the treated water containing the organic matter treated in the aeration treatment tank Sedimentation, sand, etc. A second reaction tank for performing anaerobic fermentation treatment of a supernatant liquid containing a decomposed organic substance in an upper layer that has been subjected to sedimentation treatment in the sedimentation treatment tank. It is characterized by having.

[0013] With this configuration, the organic waste such as garbage and sludge introduced into the first reaction tank can coexist with aerobic and anaerobic microorganisms in the porous microorganism treatment medium. Therefore, if aeration is performed while stirring this, the aerobic microorganisms will digest the organic waste that the aerobic microorganisms use as a nutrient source, and if the aeration is stopped, the anaerobic microorganisms will stop. As a result, organic wastes, which are sourced by aerobic microorganisms, are decomposed and digested.

[0014] The treated water containing the organic matter decomposed in the first reaction tank is subjected to aeration treatment in an aeration treatment tank, whereby the aerobic microorganisms cause the aerobic microorganisms to use the nutrient as a nutrient source. The waste is further broken down and digested.

The treated water containing organic substances decomposed in the aeration treatment tank is subjected to a sedimentation separation treatment in a sedimentation treatment tank.
Inorganic substances, sand, etc. are separated and collected. Further, the supernatant liquid containing the decomposed organic matter in the upper layer separated and settled in the settling tank is subjected to anaerobic fermentation treatment by anaerobic microorganisms coexisting in the porous microorganism treatment medium spread on the bottom of the second reaction tank. The organic waste such as garbage and sludge is almost completely eliminated, and finally the biochemical oxygen demand (B
OD), chemical oxygen demand (COD) and water with reduced SS (solids, suspended solids) to emission standards.

Further, the present invention is characterized in that a reflux path for refluxing the treated water treated in the second reaction tank to the first reaction tank is provided. As a result, the treated water can be reused, so that it can be used in a closed cycle and water resources are reduced.

Further, the present invention is characterized in that the upper part of the second reaction tank is open to the atmosphere. As a result, in the upper part of the second reaction tank, aerobic fermentation is also performed at the same time, and digestion and decomposition by aerobic microorganisms are promoted, and water evaporates and microorganisms infiltrate. Since it will inhabit the porous microorganism treatment medium, it is possible to always maintain the decomposition and digestion by the microorganism.

In the present invention, a combination of the aeration tank and the settling tank is provided in a plurality of stages. This promotes decomposition by aerobic microorganisms, digestion, sedimentation / separation of inorganic substances, sand, etc., so that biochemical oxygen demand (BOD), chemical oxygen demand (COD) and SS (solid content) , Suspended solids) can be further reduced.

In the present invention, a combination of the first reaction tank, the aeration treatment tank, the sedimentation treatment tank, and the second reaction tank is provided in a plurality of stages. This makes it possible to improve the processing capacity of organic waste.

Further, the present invention is characterized in that a pulverizing device for pulverizing organic waste is disposed at an input port of the first reaction tank. This makes it possible to reduce the size of the large organic waste, which keeps the prototype to some extent, so that such a waste can be treated with high processing efficiency.

Further, the present invention is characterized in that the bottom of the second reaction tank is inclined downstream. Thereby, the porous microorganism treatment medium is always in the state of being immersed in the treated water, so that the microorganisms can inhabit it, and the decomposition and digestion by the microorganisms can be always maintained.

Further, in the present invention, the feeding device for feeding the processing water to and from each of the processing tanks is an air lift pump. As a result, large-sized organic waste that has not progressed much in decomposition and organic waste having a large specific gravity are not sent to the next step, so that the reaction in each treatment tank can be kept constant. It becomes possible.

Further, the present invention is characterized in that the porous microorganism treatment medium contains wood chips, carbonized wood chips, or both. As a result, the microbial inhabitation rate in the porous microorganism treatment medium increases, so that the treatment efficiency increases.

[0024]

FIG. 1 is a plan view showing an organic waste treatment apparatus of the present invention, FIG. 2 is a longitudinal sectional view taken along the line II of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line III-III in FIG. 2, FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. 4, and FIG. FIG. 7 is a cross-sectional view taken along line VI-VI in FIG. 4.

Although not shown, pickles, spaghetti, rice, vegetables, garbage, other garbage, sludge discharged from wastewater treatment facilities such as food factories, etc. are discharged from general households, restaurants, food factories and the like. Is transported by a garbage truck or the like, and is disposed on the upper wall 11 of the first reaction tank 10 of the organic waste treatment apparatus (hereinafter simply referred to as “treatment apparatus”) 1 of the present invention. By opening and closing the opening / closing lid 14 of the arranged inlet 12, the chute (not shown) is charged into the first reaction tank 10.

As shown in FIG. 1, the first reaction tank 10 is composed of two rows of first reaction tanks, and one of the first reaction tanks 10 has an inlet 12 On the side of
Crusher (disposer) for crushing organic waste 1
6 are arranged. As a result, the size of the large-sized organic waste, which has a small size of the prototype, can be crushed to a small size of, for example, at least about φ25 × 30 mm, and even such a material can be treated with high processing efficiency. ing.

In the first reaction tank 10, a porous microorganism treatment medium A is introduced in advance together with treated water. As the porous microorganism treatment medium A, Japanese Patent Publication No.
Particle size 0.2 to 5 m as disclosed in JP-A-34697
m wood chips (chips), carbonized wood chips thereof, zeolites, porous ceramics and the like can be used. Among them, for example, woody fragments produced from conifers such as cedar are preferable as habitation conditions for microorganisms described later.

The use of such a porous material allows aerobic microorganisms and anaerobic microorganisms to coexist and inhabit and act alternately to decompose and digest organic waste.

Further, as the treated water, the treated water that has been treated in the third reaction tank 60, which is the final step described later, and has been recovered can be used under reflux. The organic waste carried by a garbage truck or the like is poured from the inlet 12 by discharging water, and this amount of water is also included as treated water. Further, when the treated water is insufficient, tap water or the like is separately added.

Further, in the first reaction tank 10,
For example, the processing water, the organic waste, and the porous microorganism treatment medium A having a capacity of about 90 tons are adjusted so as to be present. The ratio is, for example, water 100: organic waste 10: porous. It is desirable to add at the ratio of the microorganism-treating medium A20, but the ratio is not particularly limited thereto, and the ratio may be appropriately changed depending on the type of the organic waste.

Further, in the first reaction tank 10, as shown in FIGS. 2 and 3, a stirring device 19 is disposed. The stirrer 19 includes a propeller 16 located near the bottom of the first reaction tank 10, a drive shaft 18 connected to the propeller 16, and a drive shaft 18 disposed on the upper wall 11 of the first reaction tank 10. It comprises a motor 20 for applying a force. The rotation speed of the stirring device 19 may be, for example, 27 rpm.

In the first reaction tank 10, as shown in FIGS. 4 to 6, an air diffuser 22 is provided. The air diffuser 22 is connected to an air supply source (not shown), a blower, and extends in the first reaction tank 10 vertically along the side wall 13. The air diffuser main pipe 24 branches off from the air diffuser main pipe 24. An air diffusion tube 26 extending in a substantially U-shape along the bottom wall 15 of the first reaction tank 10 is provided. The air diffusion tube 26 has a large number of air diffusion holes (not shown).

In the first reaction tank 10 configured as described above, the organic waste introduced from the introduction port 12 is stirred by the propeller 16 of the stirring device 19 together with the treated water and the porous microorganism treatment medium A. While becoming suspended,
Air is supplied from the air diffusion holes of the air diffusion tube 26 of the air diffusion device 22 into the first reaction tank 10 to be aerated and decomposed and digested by aerobic microorganisms living in the porous microorganism treatment medium A. Organic wastes that are sourced by aerobic microorganisms are decomposed and digested.

At this time, not only the decomposition and digestion of aerobic microorganisms but also the decomposition and digestion of anaerobic microorganisms to a small extent occur. Also, in the figure, the porous microorganism treatment medium A is illustrated as being at the bottom of the first reaction tank 10 for convenience of explanation, but in this case, it is in a suspended state (dispersed state) in the treated water. (Hereinafter referred to as the aeration tank 30)
The same applies to the above.)

The aeration amount at this time is not particularly limited, and the ratio may be appropriately changed depending on the type of the organic waste, for example, 3.57 m ^3.
/ Min is desirable.

After performing the aeration process for a certain period of time, for example, 2 to 12 hours, the aeration device 22 is stopped to stop the aeration into the first reaction tank 10, and the agitation device 19 is turned on. Stop. Thereby, by the decomposition and digestion of the anaerobic microorganisms living in the porous microorganism treatment medium A,
Organic wastes that are sourced by anaerobic microorganisms are decomposed and digested.

At this time, not only the decomposition and digestion of anaerobic microorganisms but also the decomposition and digestion of aerobic microorganisms occur to a small extent. That is, as described above, when the decomposition and digestion of aerobic microorganisms are performed, a slight amount of decomposition and digestion of anaerobic microorganisms occurs. On the contrary, the decomposition and digestion of anaerobic microorganisms occur. When the aerobic microorganisms are carried out, decomposition and digestion of aerobic microorganisms are also generated, albeit slightly.

At this time, the anaerobic fermentation may be promoted by continuing to rotate gently without stopping the stirring device 19. Thus, for a certain period of time, for example, 2 to 12
After performing the time anaerobic treatment, the treated water containing the organic matter decomposed in the first reaction tank 10 is supplied to the first water by a feeding device (not shown) as shown by an arrow in FIG. From the discharge port 17 formed in the upper wall 11 of the reaction tank 10, the aeration treatment tank 30 is introduced through the introduction / discharge port 32 of the aeration treatment tank 30.
It is to be sent inside.

In this case, an ordinary pump can be used as the feeding device, but it is desirable to use an air lift pump device 70 as shown in FIG. That is, the air lift pump device 70 includes an air supply pipe 72 and a water supply pipe 76 connected to a distal end 74 of the air supply pipe 72. Then, when air is separately supplied from the air supply source (not shown) into the pumping pipe 76 through the air supply pipe 72, the water in the pumping pipe 76 above the position of the tip 74 is mixed with the air, and the specific gravity is reduced. At the position of the tip 74, a water pressure corresponding to the inundation depth is applied, so that the water pressure pushes up the water in the pumping pipe 76 having a reduced specific gravity, and is discharged by the drain pipe 78. Has become.

By using such an air lift pump device, large-sized garbage and garbage having a large specific gravity, in which the decomposition of the first reaction tank 10 has not progressed so much, are prevented from being discharged.

That is, aeration and agitation are stopped in the first reaction tank 10 and the treated water is allowed to stand still.
In the first reaction tank 10, in order to separate SS (solid content, suspended solids), supernatant liquid containing no SS, and sediment, the SS is prevented from being sucked up as much as possible by using an air lift pump device. It has become.

The treated water containing organic matter decomposed in the first reaction tank of the first reaction tank 10 is supplied to the aeration treatment tank 3.
The discharge amount to be discharged to 0 may be set according to the size of the aeration treatment tank 30.
15 tons.

As described above, the upper wall 11 of the first reaction tank 10
After the treated water containing the organic matter decomposed in the first reaction tank is discharged from the discharge port 17 formed in the first reaction tank to the aeration treatment tank 30, it is disposed on the upper wall 11 of the first reaction tank 10. The open / close lid 14 of the input port 12 is opened, new organic waste transported by a garbage truck is charged, and the treated water collected by the third reaction tank 60, which is the final step, is recovered. Is refluxed by the reflux path 88 and introduced into the first reaction tank 10, so that the above cycle is repeated.

The additional amount in this case depends on the amount discharged to the aeration tank 30, but is about 5 tons, for example, including the treated water, and is added about three times a day. . The addition is performed with the aeration stopped in order to prevent the smell from the inlet 12 from flowing out to the outside and causing environmental pollution to the surroundings.

When operating for the first time, it is necessary to introduce soil bacteria into the first reaction tank 10 in advance because aerobic microorganisms and anaerobic microorganisms inhabit the porous microorganism treatment medium A. However, once the first reaction tank 10 is operated, it is not necessary to always add these soil bacteria and the porous microorganism treatment medium A, and it is sufficient to add them appropriately when the degradation ability is reduced.

On the other hand, as shown in FIG. 2, a porous microorganism treatment medium B similar to the porous microorganism treatment medium A of the first reaction tank 10 is previously charged into the aeration treatment tank 30.
Further, a part of the bottom wall 34 of the aeration processing tank 30 constitutes an inclined side wall 36 which is inclined, and a part thereof forms an overflow hole 42 communicating with a sedimentation processing tank 40 described later.

Further, as shown in FIGS. 4 and 5, the aeration treatment tank 30 is provided with an air diffuser 38. The air diffuser 38 includes an air supply source (not shown) and an air diffuser 33 which is connected to a blower and extends vertically along the side wall 31 in the aeration processing tank 30. Are formed.

In the aeration treatment tank 30 configured as described above, treated water containing organic matter decomposed in the first reaction tank 10 is charged, and the treated water and the porous microorganism treatment medium B are charged.
At the same time, by the action of the air introduced from the air diffusing holes of the air diffusing pipe 26 of the air diffusing device 22, the gas is stirred and suspended in the aeration processing tank 30 as shown by the arrow D in FIG. By the decomposition and digestion of the aerobic microorganisms living in the porous microorganism treatment medium B, the organic wastes, which are a nutrient source of the aerobic microorganisms, are decomposed and digested.

At this time, not only the decomposition and digestion of aerobic microorganisms but also the decomposition and digestion of anaerobic microorganisms are generated to a small extent. The aeration amount at this time is not particularly limited, and the ratio may be appropriately changed depending on the type of the organic waste, but is preferably, for example, 3.57 m ³ / min.

After performing the aeration treatment for a certain period of time, for example, 2 to 12 hours, the treated water containing the organic matter decomposed in the aeration treatment tank 30 becomes as shown by the arrow in FIG. A feeding device (not shown) from an inlet / outlet port 32 on the upper wall of the aeration tank 30 to an inlet / outlet port 46 formed in the upper wall 44 of the settling tank 40 into the settling tank 40.
It is to be sent by.

In this case, a normal pump can be used as the feeding device, but it is preferable to use an air lift pump device 70 as shown in FIG. Further, the discharge amount of the treated water containing the organic matter decomposed in the aeration treatment tank 30 to the settling tank 40 may be set according to the size of the settling tank 40. 5 to 10 tons.

On the other hand, the sedimentation treatment tank 40 is
The treated water containing the organic matter decomposed in step 0 is supplied, and by allowing it to stand, impurities such as inorganic substances and sand contained in the treated water are deposited on the bottom 48 of the settling tank 40 due to a difference in specific gravity. It is composed. In this case, the treated water overflowing in the sedimentation treatment tank 40 passes through the overflow hole 42 as shown in FIG.
To return to.

Incidentally, impurities such as inorganic substances and sand deposited on the bottom 48 of the settling tank 40 are extracted from a drain hole (not shown) and collected, and are separately used as agricultural inorganic fertilizers and the like. ing.

After the sedimentation treatment is performed in the sedimentation treatment tank 40 for a certain period of time, for example, 4 to 24 hours, the treated water containing the organic matter from which impurities such as inorganic substances and sand are removed in the sedimentation treatment tank 40 is: As shown by an arrow in FIG. 1, a second feeding unit (not shown) is disposed in parallel with the aeration treatment tank 30 from the introduction / discharge port 46 on the upper wall of the settling treatment tank 40. The air is introduced into the aeration tank 130.

The structure of the second aeration tank 130 is the same as that of the aeration tank 30, and the same aeration processing is performed. And the description is omitted.

The second aeration treatment tank 130 The treated water containing organic matter decomposed in the aeration treatment tank 30 is supplied by a feeder (not shown) as shown by an arrow in FIG. The second settling treatment tank 140 receives the second
Is fed into the settling tank 140.

The structure of the second settling tank 140 is the same as that of the settling tank 40, and the same settling is performed. The description is omitted.

As described above, in this embodiment, the aeration treatment tanks 30 and 130 and the settling treatment tanks 40 and 140 are provided in a plurality of stages, and in this embodiment, two stages are provided, and the treated water containing organic matter is disposed between them. Decomposition treatment by gas treatment, inorganic matter by sedimentation treatment,
Although the removal of impurities such as sand is further promoted, it is of course possible to provide one step or three or more steps.

In the second sedimentation treatment tank 140, the treated water containing the organic matter from which impurities such as inorganic substances and sand have been removed by sedimentation treatment, that is, the supernatant liquid in the upper layer is introduced into the second sedimentation treatment tank 140. As shown by the arrow in FIG. 1, the liquid is supplied from the discharge port 46 to the second reaction tank 60 by the supply device 50.

That is, the feeding device 50 is connected to the air lift pump device 70 as shown in FIG. 8, and as shown in FIGS. 4, 5, and 7, the pumping pipe 52 is branched ( 56) Then, along the longitudinal direction of the second reaction tank 60, the supply main pipe 5
4, 58. And this supply main pipe 5
4 and 58, the supply main pipes 54, 5
8 are provided with supply pipes 51 spaced apart in the longitudinal direction, and a plurality of supply holes 53 are formed in the supply pipe 51.

As a result, the treated water containing the organic matter from which impurities such as inorganic substances and sand have been removed by the sedimentation treatment in the second sedimentation treatment tank 140, that is, the supernatant liquid in the upper part is supplied to the supply pipe of the feeding device 50. Through the supply holes 53 of 51, the liquid is uniformly introduced into the second reaction tank 60.

On the other hand, on the bottom wall 62 of the second reaction tank 60, a cinder concrete 64 obtained by adding charcoal to the aggregate is applied so as to be inclined toward the downstream side, and is inclined toward the downstream side. An inclined bottom surface 66 is formed, and a porous microorganism treatment medium C similar to the porous microorganism treatment medium A is spread over the inclined bottom surface 66 to a thickness of about 200 to 500 cm.

The upper part 68 of the second reaction tank 60 is open to the atmosphere, and a vegetation net (Noshiba) is stretched. This is because the treated water containing the organic matter from which impurities such as inorganic matter and sand have been removed by the sedimentation treatment in the second sedimentation treatment tank 140 has already had a considerable amount of biochemical oxygen demand (BOD) and chemical Oxygen demand (COD) and SS (solid content, suspended solids) are reduced, and there is almost no odor. In the upper part of the reaction tank, aerobic fermentation will be performed at the same time, and digestion by microorganisms Degradation is promoted, and water evaporates and microorganisms infiltrate and always inhabit the porous microbial treatment medium, so that the microbial decomposition and digestion are always maintained. .

As described above, the treated water containing the organic matter from which impurities such as inorganic matter and sand have been removed by the sedimentation treatment in the second sedimentation treatment tank 140 is supplied to the supply hole 53 of the supply pipe 51 of the feeder 50. Through the decomposition and digestion of the anaerobic microorganisms that are introduced into the second reaction tank 60 and inhabit the porous microorganism treatment medium C, the organic waste that is a nutrient source of the anaerobic microorganisms is decomposed and digested. . In the upper part of the second reaction tank 60, aerobic fermentation is also performed at the same time, and digestion and decomposition by aerobic microorganisms are promoted.

As a result, the raw water is treated water in the second reaction tank 60 and is converted into biochemical oxygen demand (BOD), chemical oxygen demand (COD), and SS (solid content, suspended solids).
To obtain treated water having a reduced water content. In this case, in particular, when the raw water has a relatively low absolute concentration of organic substances and a large amount of water, such as general sewage, a wastewater standard level (for example, BOD)
Is much lower than the wastewater standard level of 20 ppm.
(Less than 5 ppm).

The treated water thus purified forms a plurality of filter discharge holes 81 disposed downstream of the second reaction tank 60, as shown in FIGS. The liquid is sucked through a discharge pump 84 disposed in the discharge pipe 82, refluxed from a discharge main pipe 86 through a reflux path 88, and introduced into the first reaction tank 10.

When the purified treated water sucked through the discharge pump 84 has an excess,
It may be discharged through a separate discharge path (not shown), or may be used in other fields, for example, for cooling water of a power generator.

When the total amount of organic matter in the raw water or the sludge or garbage initially charged is large (high concentration) and the amount of water is small, the biochemical oxygen demand in the whole process is one week. Since (BOD) is around 1000 ppm, it does not reach the emission standard for rivers and other external sources. However, in the treatment apparatus of the present invention, since the treated water treated in the second reaction tank 60 is refluxed to the first reaction tank 10, there is no need to discharge the treated water to the outside, so there is no problem. Also,
Conversely, when the amount of evaporation of water from the open portion at the upper part of the second reaction tank 60 increases and the amount of reflux water becomes insufficient, makeup water may be supplied from a makeup water supply path (not shown) separately.

The present invention is not limited to the above-described embodiment. For example, the first reaction tank 10 and the aeration treatment tank 3
0, the sedimentation tank 40, and the second reaction tank 60 may be two or more in parallel as in the above-described embodiment, or may be plural or single.

[0070]

As described above, according to the apparatus for treating organic waste according to the present invention, the organic waste such as garbage and sludge introduced into the first reaction tank is made of porous waste. Since aerobic and anaerobic microorganisms coexist in the microorganism treatment medium, if aeration is performed while stirring the aerobic microorganisms, the organic waste that the aerobic microorganisms use as a nutrient source will be digested by the aerobic microorganisms. When the aeration and the stirring are stopped, the anaerobic microorganisms decompose and digest the organic wastes that are the nutrient source of the anaerobic microorganisms.

The treated water containing the organic matter decomposed in the first reaction tank is subjected to aeration treatment in the aeration treatment tank, whereby the aerobic microorganisms cause the aerobic microorganisms to use the organic matter as a nutrient source. The waste is further broken down and digested.

The treated water containing organic substances decomposed in the aeration treatment tank is subjected to a sedimentation separation treatment in a sedimentation treatment tank.
Inorganic substances, sand, etc. are separated and collected. Further, the supernatant liquid containing the decomposed organic matter in the upper layer separated and settled in the settling tank is subjected to anaerobic fermentation treatment by anaerobic microorganisms coexisting in the porous microorganism treatment medium spread on the bottom of the second reaction tank. The organic waste such as garbage and sludge is almost completely eliminated, and finally the biochemical oxygen demand (B
OD), water with reduced chemical oxygen demand (COD) and SS (solids, suspended solids) to emission standards.

Therefore, a variety of organic wastes such as garbage discharged from general households, restaurants, food factories, etc., and sludge discharged from wastewater treatment facilities, such as food factories, are separately supplied with fermentation heat. And almost completely annihilated, making it possible to significantly reduce biochemical oxygen demand (BOD), chemical oxygen demand (COD) and SS (solid content, suspended solids).

[Brief description of the drawings]

FIG. 1 is a plan view showing an organic waste treatment apparatus of the present invention.

FIG. 2 is a longitudinal sectional view taken along line II of FIG. 1;

FIG. 3 is a sectional view taken along line II-II in FIG. 2;

FIG. 4 is a plan view taken along the line III-III in FIG. 2;

FIG. 5 is a sectional view taken along line IV-IV in FIG. 4;

FIG. 6 is a sectional view taken along line VV in FIG. 4;

FIG. 7 is a sectional view taken along the line VI-VI in FIG. 4;

FIG. 8 is a cross-sectional view of a first reaction tank showing a state where an air lift pump device is arranged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st reaction tank 11 Top wall 12 Input port 13 Side wall 14 Opening / closing lid 15 Bottom wall 16 Propeller 17 Outlet 18 Drive shaft 19 Stirrer 20 Motor 22 Air diffuser 24 Air diffuser main pipe 26 Air diffuser 30 REFERENCE SIGNS LIST 31 side wall 32 inlet / outlet 33 diffuser tube 34 bottom wall 36 inclined side wall 38 diffuser 40 settling tank 42 overflow hole 44 upper wall 46 inlet / outlet 48 bottom 50 feeder 51 supply pipe 52 pumping pipe 53 supply hole 54 supply Main pipe 60 Second reaction tank 62 Bottom wall 64 Cinder concrete 66 Inclined bottom surface 68 Upper part 70 Air lift pump device 72 Air supply pipe 74 Tip 76 Pumping pipe 78 Drain pipe 81 Filter discharge hole 82 Discharge pipe 84 Discharge pump 86 Discharge main pipe 88 Reflux route A-C Porous microorganism treatment medium

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Soichiro Kuwa 3-5-18 Imai, Ome-shi, Tokyo Inside Placeramu Co., Ltd. (72) Masao Sato Inventor 4-17-2 Akigawa, Akiruno-shi, Tokyo Stock Association 4D004 AA02 AA03 AC05 CA04 CA13 CA15 CA18 CA19 CB03 CB04 CB05 CB27 CB44 CC07 CC08 4D059 AA07 BA02 BA04 BA11 BA22 BA27 BA32 BA42 CA22 CB02 EB16

Claims (9)

[Claims] 1. A treatment apparatus for treating organic waste such as garbage and sludge, which contains a porous microorganism treatment medium, treated water, and the inputted organic waste and is stirred by a stirrer. While performing the aerobic fermentation for a predetermined time by aeration, the aerobic fermentation and the anaerobic fermentation are alternately performed so that the aeration and stirring are stopped and the anaerobic fermentation is performed for a certain time. A reaction tank configured to perform aerobic fermentation by aerating treated water containing organic matter decomposed in the first reaction tank, and treating in the aeration treatment tank. A sedimentation treatment tank for sedimenting and separating inorganic substances, sand, etc. contained in the treated water containing the organic matter, and a porous microorganism treatment medium spread over the bottom, and the upper part sedimented and separated in the sedimentation treatment tank was decomposed. Including organic matter The supernatant processor of organic waste, characterized in that it comprises a second reaction vessel for anaerobic fermentation process. 2. The treated water treated in the second reaction tank,
The organic waste treatment apparatus according to claim 1, wherein a reflux path for refluxing the first reaction vessel is provided. 3. The organic waste processing apparatus according to claim 1, wherein an upper portion of the second reaction tank is open to the atmosphere. 4. The organic waste treatment apparatus according to claim 1, wherein a combination of the aeration treatment tank and the sedimentation treatment tank is provided in a plurality of stages. 5. The method according to claim 1, wherein a combination of the first reaction tank, the aeration treatment tank, the sedimentation treatment tank, and the second reaction tank is provided in a plurality of stages. An organic waste treatment apparatus as described in the above. 6. The organic waste according to claim 1, wherein a pulverizing device for pulverizing the organic waste is disposed at an input port of the first reaction tank. Equipment for processing objects. 7. The organic waste treatment apparatus according to claim 1, wherein a bottom portion of the second reaction tank is inclined downstream. 8. The organic waste disposal apparatus according to claim 1, wherein the feed device for feeding the treated water between each of the treatment tanks is an air lift pump. Processing equipment. 9. The organic waste treatment apparatus according to claim 1, wherein the porous microorganism treatment medium includes wood chips, carbonized wood chips, or both. .