JP3426158B2 - Addition and multiplication device for complex microorganisms - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adding and multiplying complex microbial groups in an aeration tank of an activated sludge treatment device.

[0002]

2. Description of the Related Art Industrial wastewater discharged from kitchens such as restaurants and cafeterias and manufacturing process wastewater discharged from manufacturing processes of various industries must be purified by a generally known activated sludge process. There are many.

The above-mentioned activated sludge treatment includes a raw water tank for introducing raw waste water, an aeration tank for aerating the raw waste water, a settling tank for settling and separating sludge generated by aeration, and a supernatant liquid of a settling tank. A series of treatment facilities including a discharge tank for storing, a sludge tank for storing sludge settled in a settling tank, a sludge dehydrator for dehydrating sludge, an incinerator for incinerating sludge, and the like are used.

The characteristic of the activated sludge treatment is that the BOD pollutants mainly contained in the raw wastewater are treated by a microbial group involved in purification, and how the microbial group is actively and vigorously inhabited, The point is how to process efficiently.

Therefore, it is required that the above-mentioned microbial group is allowed to live in an aeration tank under the control of constant temperature, pH, dissolved oxygen amount, nutrient amount, etc., so that it can always operate soundly. To be done.

[0006] As the microbial group that works effectively for the treatment of activated sludge, a complex microbial group, which is mainly composed of aerobic bacteria, is generally used. This complex microbial group takes over excess activated sludge from a sewage treatment plant or a wastewater treatment plant of a company that already has activated sludge treatment as an inoculum before starting the activated sludge treatment, or it is a substrate of the raw wastewater. According to the above, the complex microbial group that has been selected, fixed and fixed on a carrier and put into hibernation is purchased, and the treatment is started by acclimatizing and proliferating in an amount until purification treatment is possible.

In any of the above cases, the acclimatization and growth of the above-mentioned complex microbial group is usually 3 to 4 by putting it in an aeration tank and diluting the raw wastewater by about 3 times.
For about a week, an appropriate amount of nutrients such as nitrogen, phosphorus and vitamins is given at a constant temperature, and in a state of being aerated, the complex microbial group in the activated sludge is acclimated and proliferated. In the process, the solution in the aeration tank is sampled every day and observed under a microscope to confirm that a large number of the complex microbial groups have occurred.

However, when the surplus activated sludge is transferred, particularly when the volume of the aeration tank is large, the required amount becomes large and the labor and cost for carrying it in increase.

On the other hand, in the case of using a complex microbial group which is fixed and fixed on the carrier and put into a hibernation state, when the complex microbial group is placed in an aeration tank, the environment of the complex microbial group rapidly changes to give a shock. Therefore, it is difficult to acclimate and multiply efficiently.

[0010]

DISCLOSURE OF THE INVENTION The present invention eliminates the disadvantages of the above-mentioned conventional examples, and allows complex microbial groups to be added to the aeration tank without giving a sudden shock, and also serves as an effective field for their growth. It is a problem to be solved to provide an additive growth apparatus for a complex microbial group.

[0011]

[Means for Solving the Problems] 1 of the present invention is an inner cylinder for filling a carrier supporting a complex microbial group, the inner cylinder having a net-like peripheral side wall, and the inner cylinder. Is an outer cylinder having the same central axis and which can be inserted and removed in a removable manner, and a plurality of through holes are opened in the peripheral side wall of the outer cylinder, and the peripheral side wall is required to be treated wastewater between the peripheral side wall and the peripheral side wall of the inner cylinder. And an outer cylinder configured to have an inner diameter at which a sufficient interval of flowing occurs, and is immersed in an aeration tank of an activated sludge treatment device, and the complex microbial group carried on the carrier is added to the aeration tank. A device for adding and multiplying a complex microbial group, wherein the inner cylinder and the outer cylinder are used as a place for the growth of the complex microbial group.

Therefore, according to the apparatus for adding and multiplying a complex microbial group of the present invention, the complex microbial group in the carrier filled in the inner cylinder is stored in the aeration tank when it is immersed in the aeration tank. A part of the flow of raw wastewater and aeration flow slowly separates from the carrier and passes through the mesh of the inner cylinder, passes through the flow hole of the outer cylinder, and gradually becomes an appropriate amount of environment for the aeration tank. As they get used to it, they are effectively released into the aeration tank without being shocked.

The complex microbial group thus released can actively and efficiently treat the BOD pollutant component of the raw wastewater in the aeration tank.

Further, the mesh of the inner cylinder serves as a place where the complex microbial group can be suitably grasped, and is also a perfect place to grow a new complex microbial group.

According to a second aspect of the present invention, in the apparatus for adding and multiplying a complex microbial group according to the first aspect of the present invention, the mesh on the peripheral side wall of the inner cylinder has an opening of 2 to 3 mm.

Therefore, according to the second aspect of the present invention, the apparatus for adding and growing a complex microbial group, the complex microbial group supported on the carrier is gradually released through the mesh and proliferates in the mesh. , Can increase the amount efficiently.

Further, by forming the mesh with the mesh having the above-mentioned size, it is possible to construct a wide range of places where the complex microbial group can be suitably contacted and grasped. A large number of complex microbial groups can be easily grown. And, needless to say, efficient decomposition of organic matter is carried out in the process of this proliferation.

In a third aspect of the present invention, in the apparatus for adding and multiplying a complex microbial group according to the first aspect of the present invention, the flow holes in the peripheral side wall of the outer cylinder have different diameters of 3 to 15 mm. It is a thing.

Therefore, according to the apparatus for adding and multiplying complex microbial groups according to the third aspect of the present invention, the complex microbial groups pass through a plurality of the circulation holes formed in the outer cylinder and having different diameters,
While gradually accustomed to the environment of the aeration tank, it is released into the aeration tank without being shocked, so that the activity is not weakened.

According to a fourth aspect of the present invention, in the apparatus for adding and multiplying a complex microbial group according to the first aspect of the present invention, the interval at which the waste water to be treated flows between the both side walls is 10 to 30 mm.

Therefore, according to the apparatus for adding and multiplying complex microbial groups according to the fourth aspect of the present invention, due to the plurality of the flow holes formed in the outer cylinder and having different caliber, a proper amount of wastewater to be treated which does not settle between the both side walls. Therefore, the complex microbial group which is caught in the mesh and is trying to proliferate is not removed from the mesh. Further, since there is a suitable flow, it is possible to maintain an aerobic condition.

In the fifth aspect of the present invention, in the apparatus for adding and growing a complex microbial group according to the first aspect of the present invention, the carrier is a lump of a porous inorganic material having a diameter of 10 to 40 mm.

Therefore, according to the apparatus for adding and multiplying a complex microbial group of 5 of the present invention, since the carrier is a lump of a porous inorganic material, the complex microbial group can penetrate into the inside thereof, A large amount of bacteria can be reliably supported. Further, since it is a lump, the carrier does not become entangled with the mesh and clogged when immersed in the aeration tank. Furthermore, the supported complex microbial group is not released all at once, but is gradually released, which is effective.

Further, since the carrier is made of an inorganic substance, when it is immersed in the aeration tank, the amount of pollutants which is a burden on the microflora in the tank does not increase.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The drawings show an embodiment to which the present invention is applied. FIG. 1 is a partially cutaway perspective view of a partially exploded state of the additive breeding apparatus, and FIG. 2 is a partially cutaway perspective view of the inner cylinder thereof. 3 is an exploded perspective view of the outer cylinder, FIG. 4 is a partially cutaway perspective view of the addition breeding apparatus set vertically in the aeration tank, and FIG. 5 is a horizontal assembly of the addition breeding apparatus in a frame. It is a perspective view.

As shown in FIGS. 1, 2 and 3, the apparatus for growing a complex microbial group of the present invention is set on the same central axis so that the inner cylinder 1 and the outer cylinder 2 can be inserted and removed freely. To form a composite vertically long cylindrical body 3, the peripheral side wall of the inner cylinder 1 is formed into a mesh screen 4, a plurality of flow holes 5 are formed in the peripheral side wall of the outer cylinder 2, and A sufficient space 6 is provided between the peripheral side walls to allow the waste water to be treated to flow.

The inner cylinder 1 is filled with a carrier 8 carrying a group 7 of complex microbial bacteria, and the carrier 8 is immersed in an aeration tank of an activated sludge apparatus. Group 7
In addition to starting the activity of (1), the mesh 4 forming the peripheral side wall is used as a habitat for the growth of a new microbial group.

The inner cylinder 1 is formed in a cylindrical shape or a polygonal cylinder shape, and its size needs to take into consideration the relationship with the diameter of the outer cylinder 2 which will be described later, and the outer diameter is smaller by about 20 to 60 mm. So that, for example, the outer diameter is 75
Approximately 150 mm. The length is 1000 to 2400
It is suitable to configure to about mm. In addition, as materials for forming the same, plastics resistant to corrosion, stainless steel and the like are preferably used.

It is preferable that the upper end and the lower end of the inner cylinder 1 are opened so that the lid 9 at the upper end and the bottom plate 10 at the lower end of the outer cylinder 2 are shared as the lid or the bottom. If necessary, a lid and a bottom may be formed on the inner cylinder 1 in advance.

As shown in FIG. 2, the peripheral side of the inner cylinder 1 is
Cylindrical frame 11 and two or three openings for exterior
The mesh screen 4 of mm and a tubular body. Here, the material forming the reticulated screen 4 is preferably corrosion resistant plastics, stainless steel, or the like.

Further, the mesh screen 4 has an opening of 2 to 3 mm when it is immersed in the aeration tank.
This is because the complex microbial group carried on the carrier 8 is gradually released little by little without being suddenly released from the mesh to prevent a sudden shock.

Further, in the nuclear mesh of the mesh screen 4, the complex microbial group 7 separated from the carrier 8 can be easily grasped, and a new complex microbial group 7 can be obtained.
It is also a great place to live in.

Next, the outer cylinder 2 is, as shown in FIG.
Similar to the inner cylinder 1, it has a cylindrical shape or a polygonal cylindrical shape.
Further, as the material constituting this, plastics and stainless steel which are resistant to corrosion as in the case of the inner cylinder 1 are preferable.

When the outer cylinder 2 has a cylindrical shape, it has an inner diameter of 100 to 17 corresponding to the outer diameter of the inner cylinder 1.
A suitable length is about 5 mm and a length of about 1000 to 2400 mm. By doing so, when the inner cylinder 1 is set in the outer cylinder 2, a space 6 of 10 to 30 mm can be provided between the peripheral side walls, through which the waste water to be treated flows.

By setting the interval 6 between the both side walls to be in the above range, a proper amount of waste water to be treated which does not settle between both side walls through the plurality of flow holes 5, 5, ... Formed in the outer cylinder 2. A flow is generated, and the complex microbial group 7 in the inner cylinder 1 is no longer released into the aeration tank at once, or the complex microbial group 7 is trying to grow by being caught in the mesh. Will not be removed from the mesh.

An openable / closable lid 9 is provided at the upper end of the outer cylinder 2 so as to be shared with the lid of the inner cylinder 1. In addition, depending on the use situation, when it is used by hanging it sideways in the aeration tank and immersing it, the upper surfaces of both cylinders may be left open.

On the other hand, the bottom plate 10 is provided on the lower surface of the outer cylinder 2 so as to be shared with the bottom of the inner cylinder 1. Further, depending on the usage conditions, a plurality of holes of about 2 to 3 mm may be formed in the bottom plate 10 so that the complex microbial group 7 can be released from the bottom surface.

A plurality of flow holes 5, 5, ... Are opened in the peripheral side surface of the outer cylinder 2 as described above. .. are formed as holes having different diameters of 3 to 15 mm on the peripheral side surface of the outer cylinder 2.

The range of the flow holes 5, 5 ... Having different diameters is that the plurality of flow holes 5, 5 having different diameters formed in the outer cylinder 2 by the complex microorganism group are formed.
Through, gradually get used to the environment of the aeration tank,
This is to ensure that the activity is released without being shocked and that its activity is not weakened.

The composite vertically long cylindrical body 3 has the inner cylinder 1 in the outer cylinder 2 so that the central axes of the both cylinders coincide with each other, that is, the space 6 is maintained between the side walls. To be configured by combining. Therefore, the lid 9 and the bottom plate 10 of the outer cylinder 2 are positioned so that the central axis of the inner cylinder 1 is aligned with the central axis of the outer cylinder 2, respectively. Protrusions 12a and 12b are formed in advance so that the inner cylinder 1 can be fixed at an appropriate position when the lid 9 and the bottom plate 10 are attached.

The group of complex microorganisms to be carried on the carrier 8 to be filled in the inner cylinder 1 is a group of bacteria selected carefully which works effectively for the purification of water, and these groups include aerobic group and facultative group. An anaerobic bacterial group and an anaerobic bacterial group are used. The content ratio of each bacterial group is about 60 to 85% for aerobic bacteria, about 20 to 5% for facultative anaerobic bacteria, and 2 for anaerobic bacteria.
It is included in about 0 to 5%.

Here, each bacterial group is referred to as the above-mentioned complex microbial bacterial group because the inside of the aeration tank is in an anaerobic state or a pseudo-anaerobic state, and the organic matter in the introduced raw wastewater is wrapped with something like a colloid. In such a situation where the aerobic bacteria group is input, the decomposition activity is not performed if only the aerobic bacteria group is input, and the aerobic bacteria group coexists with the anaerobic bacteria group and the facultative anaerobic bacteria group. This is because a satisfactory decomposition activity will be performed only after the bacterial population is added.

According to the observation of the present inventor, when the above-mentioned anaerobic state or pseudo-anaerobic state is entered, even if aerobic bacteria are put into the anaerobic state and subjected to aeration treatment, it remains in a gelatinous state. The encapsulated organic matter is hardly decomposed, but simply moves in the tank with the movement of the treatment wastewater, and finally it is deposited and deposited in the lower portion of the tank where the flow is poor. is there.

However, as described above, when the complex microbial group in which a facultative anaerobic group and an anaerobic group are symbiotic are put into the tank in the above-mentioned situation, As a result, the decomposition of organic substances wrapped in collagen is started, and good decomposition activity will continue.

This is because when the complex microbial group is put into the tank in the above situation, first, the anaerobic bacterial group and the facultative anaerobic bacterial group act to form a colloidal membrane encapsulating the organic matter. It can be presumed that this is because the decomposition of the organic substance inside is started at the same time as the breakage, and the aerobic bacteria group subsequently act to further promote the decomposition of the organic substance to restore the activated sludge treatment to normal.

Each of these bacterial groups should be appropriately selected depending on the temperature of the raw wastewater to be introduced. When the temperature of the raw wastewater is 25 to 35 ° C., it is actively activated in this temperature range. When the temperature of the raw wastewater to be introduced is 25 ° C or lower, the psychrotrophic bacteria that are active in this temperature range are mainly used.

Each of these bacterial groups is a bacterial group which is present in nature and which works effectively for purification and is a safe bacterial group.

The complex microbial group is held on the carrier 8 as follows. That is, a microbial stock solution is added to a carrier composed of protein and corn powder, and a plurality of species such as nitrogen minerals, vitamins and minerals are added to the carrier, and the carrier 8 is embedded in the complex microbial group. Culture. Thus, the culture is continued for a certain period of time, for example, about one week or more. By doing so, the complex microbial group enters the inside of the carrier 8. When the water content is gradually decreased, each bacterium in the microbial group becomes dormant. The dormant bacterial groups resume their activities when released into the raw wastewater of the aeration tank.

Here, as the carrier 8, a block-shaped porous inorganic substance such as block-shaped ceramics or zeolite is used. Due to the above-mentioned porosity, each of the above-mentioned bacterial groups can enter the inside thereof and be firmly supported, and can be in a dormant state in a stable state. The size of the lump is preferably about 10 to 100 mm in diameter.

The concentration (titer) of each bacterial group is determined according to the substrate concentration of the raw wastewater to which it is applied. (Obtained by doing so). For example, in the case of using a bacterium stock solution brewed by the present inventor, usually, about 10
Bacteria are planted at the ratio of% weight concentration. On the other hand, when it is necessary to increase the concentration (titer) of the bacterial group, the proportion of the stock solution is increased as necessary. Here, if the concentration of the stock solution is increased, it cannot be said that the concentration of the bacteria when the culture is completed and the water content is lowered to put it into a dormant state is not necessarily proportionally increased, but it is generally increased accordingly.

The standard of the concentration of the bacteria group to be added to the raw wastewater can be determined experimentally. For example, by repeating the experiment by injecting a fixed amount of the bacterium stock solution brewed under a fixed condition on a fixed carrier and culturing and fixing the bacterial group fixed under a fixed condition into the raw wastewater under a fixed substrate condition (concentration), The degree of effectiveness of such a bacterial group becomes clear, and this can be used as a reference value for bacterial concentration. In this way, if the standard of the concentration of bacteria that effectively acts on the raw wastewater with a constant substrate concentration is determined, the substrate concentration of the raw wastewater is compared with the above-mentioned constant substrate concentration as the standard, and if it exceeds it, Therefore, the bacterial concentration should be increased accordingly. As described above, the bacterium concentration can be increased by increasing the ratio of the bacterium stock solution loaded on the carrier.

Next, a method of using the apparatus for adding and multiplying complex microbial groups of the present invention will be described. First, a plurality of inner cylinders 1, 1 ... Filled with a massive carrier 8 carrying a complex microbial group is prepared. The complex microbial group is obtained by culturing it corresponding to the temperature of the raw wastewater to be treated here according to the substrate concentration of the raw wastewater and supporting it on the lump-shaped carrier 8.

The inner cylinders 1 thus prepared are filled in the outer cylinders 2 and fixed as shown in FIG. 1 to form a composite longitudinal cylinder state 3. After that, each composite vertically long tubular body 3,
Depending on the size of the aeration tank, a plurality of 3 are soaked for the purpose of acclimatizing the microbial flora as a preparatory step for starting the activated sludge treatment and the subsequent growth purpose.

As for the dipping method, the composite vertically elongated cylindrical body 3 may be dipped in any place as it is to start the use.
As shown in FIG. 4, a small hole may be formed in the upper portion of the composite elongated tubular body 3, and a wire, rope, or the like may be passed through the small hole so as to be vertically suspended and immersed.

Further, as shown in FIG. 5, the composite elongated cylindrical body 3 is laid sideways, and a plurality of metal frames which are resistant to corrosion are assembled and fixed, and the composite longitudinal cylinders 3 are suspended together with the frame. It can also be used by immersing it in an aeration tank.

Each of the composite elongated cylindrical bodies 3, 3, ... Soaked in the aeration tank gradually releases the complex microbial cell group in the inner cylinder 1 into the aeration tank, and the inner cylinder 1 has a mesh shape. The screen 4 is also a perfect place for the growth of a new complex microbial group.

Then, each of the composite vertically long cylindrical bodies 3, 3, ...
Is, after starting the use by immersing it in the aeration tank, by continuing to use it as it is, the formation of a biofilm by the complex microbial group that acts on the raw wastewater, or it is generated. It is also a suitable filter bed for the retention of biofilm.

Further, when the inside of the aeration tank becomes anaerobic due to the fluctuation of the load of the raw waste water or some trouble, and the retention of the biofilm can no longer be seen, each of the composite vertically long cylindrical bodies 3, 3, ... Is taken out of the aeration tank and is cleaned, and the carrier 8 in the inner cylinder 1 is taken out and filled with a carrier 8 carrying a new complex microbial group, and again in the aeration tank. It is used by dipping in.

[0059]

EXAMPLES Next, the present invention will be specifically described with reference to examples, but this is for explaining the effects of the present invention, and the present invention is not limited thereto.

<Example 1> Kitchen wastewater discharged from a restaurant and domestic wastewater discharged from a general household were combined, and the total discharge amount was 5 m.
³ / day, average water quality is pH 7.3, BOD 630ppm, S
Raw wastewater of S110ppm will be treated by activated sludge treatment. As preparation for it, aeration tank (effective volume 1m
³ = 1 m in length x 1 m in width x 1.1 m in depth) For the purpose of acclimatizing and growing the microflora, it was decided to use the apparatus for growing a complex microbial group of the present invention.

The inner cylinder 1 has an outer diameter of 125 mm and a length of 1000 m.
A vinyl chloride resin tube having a thickness of 5 mm and a wall thickness of 5 mm was used to partially form the peripheral side wall to form a frame 7, and a metal wire mesh made of stainless steel having an opening of 2.5 mm was exteriorly formed.

The outer cylinder 2 has an inner diameter of 165 mm and a length of 1000 m.
Using a vinyl chloride resin tube with a wall thickness of 5 mm and a wall thickness of 5 mm, 60 holes with a diameter of 3 mm, 60 holes with a diameter of 9 mm and 45 holes with a diameter of 13 mm were used as the circulation ports 5 on the side walls. It is configured to have an average opening.

Further, the outer cylinder 2 is provided with two round plates of vinyl chloride resin having a diameter of 185 mm and a thickness of 8 mm, a lid 9 and a bottom plate 10.
, The lid 9 is provided with a positioning protrusion 11a, and the bottom plate 1
Positioning protrusions 11b are attached to predetermined positions at position 0 so that the inner cylinder 1 can be fixed while being positioned on the central axis.

Then, the inner cylinder 1 is inserted into the outer cylinder 2 so that the central axis thereof coincides with the central axis of the inner cylinder 1, and the lid 9 is inserted.
And the bottom plate 10 are attached respectively, and the distance between both side walls is 20.
The composite elongated cylindrical body 3 used in Example 1 having a size of mm was completed.

It should be noted that the inner cylinder 1 is filled with a carrier 8 carrying a complex microbial group in advance. Supporting of the complex microbial group on the carrier 8 is performed as follows.

[Composition of complex microbial group used in Example 1 and method of carrying bacterial group on carrier 8] Aerobic group 75%, facultative anaerobic group 20%, anaerobic group 5% The ratio of
A microbial stock solution was brewed by coexisting with the complex microbial group 7 in which each bacterium group was 50% mesophilic and 50% psychrophilic. Then, the above-mentioned stock solution is added at a ratio of 2: 5 to a mixture of protein and corn powder as a main component and appropriate amounts of vitamins and minerals, and the carrier 8 has an average diameter of 50 mm. A lump of zeolite is buried, and thus the complex microbial group is cultivated, and the complex microbial group is contained inside the porous body of the carrier 8 which is a lump of the zeolite, and then water is slowly added at room temperature. Is reduced.

Next, the raw wastewater was diluted 3 times to fill the aeration tank, the liquid temperature was controlled at 18 to 32 ° C., and air was blown into the tank to aerate the complex microbial group. 8 of the above-mentioned composite elongated tubular bodies 3, 3 ... Supported and loaded on the carrier 8 were hung vertically with a rope and immersed in an aeration tank to start acclimatization and growth of the complex microbial group. .

After acclimation and growth of the complex microbial group is started, the solution in the aeration tank is sampled twice a day every day, and the solution is sampled in a slide, and the field of view is examined under a microscope of 20 times. The habitation state of the microbial groups in the above was observed, the number and the activity status were confirmed, and the average values are summarized in Table 1. Further, after the lapse of 5 days, the composite vertically long tubular bodies 3, 3, ... Was pulled up from the aeration tank once a day, and the formation state of the biofilm on the mesh screen 4 of the inner barrel 1 was visually observed.

[0069]

[Table 1] * The number of microorganisms is measured while looking through a microscope (20x). When the microorganisms move and move well, things that come out of the field of view and things that come into the field of view intersect. , And 40 or more, since they cannot be counted accurately, they are displayed as 40 <.

As can be seen from the results of Example 1 shown in Table 1, the presence of microorganisms was observed 3 days after the start of acclimation and growth using the apparatus for growing a complex microbial group of the present invention.
After 6 days, there are 13 or more, and it can be seen that the microbial activity is moving well and that they are actively inhabiting.

After 10 days, the number of microorganisms further increased to 40 or more, and the movement became more active,
It was difficult to measure accurately because there was a lot of entry and exit from the field of view under a microscope. If this happens,
From the experience so far, it can be seen that the acclimation and growth of the microflora have been completed, and the raw wastewater can be gradually introduced to start the treatment. Therefore, it was possible to prepare a state in which the treatment of the microflora in the aeration tank could be started in a shorter period than usual.

Further, regarding the formation of the biofilm, the formation of the biofilm was confirmed after 7 days, and the microorganisms were steadily grown so that the raw wastewater could be gradually introduced to start the treatment. I was able to judge.

[0073]

As described above, according to the apparatus for growing a complex microbial group of the present invention, the complex microbial group in the inner cylinder is aerated when immersed in the aeration tank. Riding on the flow of raw waste water and the flow of aeration in the tank, slowly pass through the mesh of the inner cylinder away from the carrier, gradually pass through the flow hole of the outer cylinder, and gradually the appropriate amount of the aeration tank. It is possible to effectively add to the aeration tank without getting shocked while accustomed to the environment.

Further, the complex microbial cell group thus released can actively and efficiently treat the BOD pollutant component of the raw wastewater in the aeration tank.

Further, the mesh serves as a place where the complex microbial group can be suitably grasped, and is a perfect place to grow a new complex microbial group.

According to the second aspect of the present invention, the apparatus for growing a complex microbial group, the complex microbial group supported on the carrier is:
Since it is gradually released through the mesh, the amount can be increased efficiently and effectively.

Further, by setting the mesh size to the above-mentioned diameter, it is possible to form a wide area where the complex microbial group can be appropriately contacted and grasped, so that a new complex microbial group can be easily formed. Can be propagated in large numbers.

According to the apparatus for growing a complex microbial group according to the third aspect of the present invention, the complex microbial group is gradually transferred to the aeration tank through the plurality of flow holes formed in the outer cylinder and having different diameters. While being accustomed to the environment, it can be added to the aeration tank without being shocked, so that the activity is not weakened.

According to the apparatus for growing a complex microbial group according to the fourth aspect of the present invention, a plurality of the flow passages formed in the outer cylinder and having different calibers can generate an appropriate flow of water that does not settle between the side walls. Therefore, the complex microbial group that is being caught in the mesh and trying to grow will not be dropped from the mesh.

According to the apparatus for growing a complex microbial group of 5 of the present invention, since the carrier is a lump of a porous inorganic material,
The complex microbial group can penetrate even into the inside thereof and can be supported in a large amount and reliably. Further, since it is a lump, the carrier does not become entangled with the mesh and clogged when immersed in the aeration tank. Furthermore, the supported complex microbial group is not released all at once, but is gradually released, which is effective.

Further, since the carrier is made of an inorganic substance, when it is immersed in the aeration tank, the amount of pollutants which is a burden on the microflora in the tank does not increase.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an additive breeding device according to an embodiment in a partially disassembled state.

FIG. 2 is a partially cutaway perspective view of an inner cylinder of the additive breeding device according to one embodiment.

FIG. 3 is an exploded perspective view of an outer cylinder of the additive breeding device according to one embodiment.

FIG. 4 is a partially cutaway schematic perspective view showing a state in which the additive breeding device of one embodiment is vertically set in an aeration tank.

FIG. 5 is a schematic perspective view in which the additive breeding device of one embodiment is laterally incorporated in a frame.

[Explanation of symbols]

1 inner cylinder 2 outer cylinder 3 Vertical composite tubular body 4 mesh screen 5 circulation holes 6 intervals 7 frames 8 carriers 9 lid 10 bottom 12a, 12b Positioning protrusion

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) C02F 3/10 C02F 3/12

Claims (5)

(57) [Claims] 1. An inner cylinder for filling a carrier carrying a complex microbial group, the inner cylinder having a peripheral side wall formed in a net shape, and the inner cylinder having the same central axis and being detachable. An outer cylinder to be installed, in which a plurality of circulation holes are opened in the peripheral side wall, and the peripheral side wall is configured to have an inner diameter that allows a sufficient gap between the peripheral side wall of the installed inner cylinder to flow the waste water to be treated. The outer cylinder is composed of the above-mentioned outer cylinder and the outer cylinder, which is immersed in the aeration tank of the activated sludge treatment device to add the complex microbial group supported on the carrier to the aeration tank, and to combine the inner cylinder and the outer cylinder. A device for adding and multiplying complex microbial groups, which serves as a place for the growth of microbial groups. 2. The mesh of the peripheral side wall of the inner cylinder is opened by 2 to 3
The device for adding and multiplying a complex microbial group according to claim 1, which has a size of mm. 3. The through hole in the peripheral side wall of the outer cylinder has a diameter of 3 to 1.
The additive growth apparatus for complex microbial groups according to claim 1 or 2, wherein the holes have different sizes of 5 mm. 4. An apparatus for adding and multiplying complex microbial groups according to claim 1, 2 or 3, wherein the flow interval of the waste water to be treated between both side walls is 10 to 30 mm. 5. The additive growth apparatus for a complex microbial group according to claim 1, 2, 3 or 4, wherein the carrier is a lump of a porous inorganic material having a diameter of 10 to 40 mm.