JPH10328683A - Sprinkling filter bed type bioreactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel sprinkling filter bed type bioreactor in which raw water is uniformly sprinkled on the packed bed of microorganisms. SOLUTION: In the sprinkling filter bed type bioreactor, the upper supporting member 9 consisting of a perforated plate or a network body for passing raw water is laid over the upper part of the packed bed 4 of microorganisms held in the inside of the body 1 of a reactor. Also, a raw water dispersion layer 8, which is constituted by spreading spherical bodies 7 having specific gravity smaller than raw water in many laminar states, is formed on the upper supporting member 9. Thereby, raw water introduced into the body 1 of the reactor is uniformly dispersed and sprinkled on the packed bed 4 side of microorganisms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a trickling filter type bioreactor for purifying sewage and industrial wastewater with microorganisms.

[0002]

2. Description of the Related Art FIG. 5 shows a trickling filter type bioreactor for purifying raw water containing growth substrates of microorganisms such as sewage and industrial wastewater with aerobic microorganisms.

[0003] As shown in the figure, a raw water line b for introducing raw water containing a growth substrate of microorganisms such as sewage or industrial wastewater is connected to the ceiling of a vertical reactor body a.
A drain line c for draining water from the bottom of the reactor body a is connected to the bottom.

[0004] Further, inside the reactor body a, a microorganism-packed layer d in which a filler in which aerobic microorganisms have propagated is collected in a layered manner is accommodated. Further, outside air is filled in the space above the microorganism-packed layer d. An intake line e to be introduced is connected, and a microorganism filling layer d is provided in a space below the microorganism filling layer d.
An exhaust line g for forcibly exhausting the air passing through by the exhaust fan f is connected.

[0005] As shown in the figure, the exhaust fan f is driven to introduce air into the reactor body a to supply air to the aerobic microorganisms in the microorganism-filled layer d, and to feed the microorganism-filled layer from the raw water line b. After flowing the raw water through d, the growth substrate of microorganisms such as organic substances in the raw water is decomposed and removed and purified, and then the purified water is drained from the drain line c to the outside of the reactor body a.

[0006]

By the way, in the trickling filter type bioreactor configured as described above,
The raw water supplied from the conventional raw water line b is converted into a microorganism packed bed d.
The spray nozzle h has been used to uniformly spray water on the top, but if the raw water contains a lot of insoluble contaminants, the contaminants are likely to clog the spray nozzle h and cause clogging. There was a point.

Therefore, instead of such a spray nozzle h, as shown in FIG. 6, an outlet of a raw water line b is provided with an umbrella-shaped watering member i having a large number of passage holes formed therein. A method has been considered in which wastewater is flown to the top to uniformly disperse the raw water and sprinkle water.

However, only the umbrella-shaped watering member i has a drawback that it is difficult to obtain uniform watering when the amount of supplied raw water varies. That is,
As shown in FIG. 7 (A), when the amount of raw water is small, the flow momentum is small. Therefore, most of the water drops from the hole j near the top before reaching the skirt of the watering member i, and the microorganisms drop. If the amount of wastewater is concentrated in the central portion of the packed bed d and the amount of wastewater is large, the flow of the raw water is large as shown in FIG. 7 (B). And concentrated on the outside of the microorganism-filled layer d, and it was difficult to spray water uniformly on the microorganism-filled layer d.

Accordingly, the present invention has been devised in order to effectively solve such a problem, and an object of the present invention is to provide a novel trickling filter type capable of uniformly spraying raw water into a microorganism-packed bed. A bioreactor is provided.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sprinkling filter type biomass in which raw water is passed through a bed packed with microorganisms contained in a reactor body from above to purify the bed. In the reactor, an upper supporting member made of a perforated plate or a mesh body that passes through raw water is bridged over the microorganism-packed layer, and a large number of spherical bodies having a specific gravity smaller than the raw water are spread on the upper supporting member in layers. A raw water dispersion layer is formed. In other words, by forming a raw water dispersion layer formed by laying a large number of spheres in layers above the microorganism-packed layer, even when the raw water is sprinkled in an uneven state, the spheres forming the raw water dispersion layer When flowing along the surface of the microbe, it is finely dispersed, so that the raw water can be evenly sprinkled and flown to the microorganism packed layer side.

Further, by forming the spherical bodies with a material having a specific gravity smaller than that of the raw water, when the raw water dispersion layer is clogged and the raw water accumulates on the raw water dispersion layer, the spherical bodies float and move. Will be. As a result, the distance between the spherical bodies is increased, and clogging is effectively eliminated.

[0012]

Next, a preferred embodiment of the present invention will be described.

FIG. 1 shows an embodiment of a trickling filter type bioreactor according to the present invention.

As shown in the figure, this sprinkling filter type bioreactor is connected to a raw water line 2 for introducing raw water (waste water containing a growth substrate for microorganisms) at the center of the ceiling of a vertical reactor body 1. A drain line 3 for draining the introduced raw water to the outside of the reactor body 1 is connected to the bottom thereof.

Further, inside the reactor body 1, there is formed a microorganism packing layer 4 packed with a filler carrying aerobic microorganisms, and the microorganism packing layer 4 traverses the inside of the reactor body 1. Support member 5 provided as follows
It is supported by.

The lower support member 5 is formed of a mesh having openings so that the filler carrying aerobic microorganisms does not fall or a perforated plate having a plurality of holes formed therein. The water that has been passed through the microorganism-packed layer 4 while being supported at the intermediate portion of the reactor 1 is allowed to pass directly to the bottom side of the reactor body 1.

An umbrella-shaped watering member 6 is provided on the ceiling of the reactor body 1, that is, below the raw water line 2. As described above, the water sprinkling member 6 is in the form of a perforated plate having a large number of holes formed in the side surface thereof, and the top 6a is located below the discharge port 2a of the raw water line 2 to discharge water. The raw water discharged from the outlet 2a is transferred to the top 6
a to be dispersed radially and sprayed on the microorganism-packed layer 4 side.

An upper support member 9 having a large number of holes formed so as to cover the upper surface of the microorganism-packed layer 4 is bridged below the watering member 6.
A raw water dispersion layer 8 formed by laying a plurality of spherical bodies 7 in layers is formed at the upper part of the raw material, and the raw water flowing down from the watering member 6 is further finely dispersed and sprinkled on the microorganism-filled layer 4 side. ing.

The spherical body 7 constituting the raw water dispersion layer 8 is
3A. The structure has a specific gravity lower than that of raw water (water), that is, is made of a material that floats on the water surface. For example, as shown in FIG.
It is formed from a spherical foam 7b as shown in FIG. On the other hand, the upper support member 9 for supporting the raw water dispersion layer 8 is formed of a mesh having openings to the extent that the spherical body 7 does not drop or a perforated plate having a plurality of holes formed therein, similarly to the lower support member 5 described above. The raw water dispersion layer 8 is supported above the microorganism-packed layer 4 at a predetermined interval, and the raw water on the microorganism-packed layer 4 side is allowed to pass as it is to flow to the microorganism-packed layer 4 side.

In addition, an intake line 10 and an exhaust line 11 are provided in an upper space and a lower space of the microorganism packed layer 4, respectively.
Is supplied from the intake line 10 to supply air into the microorganism-packed layer 4 by an exhaust fan 12 or the like provided in the exhaust line 11, and the supplied air is supplied from the exhaust line 11 to the reactor body. 1 is forcibly exhausted.

Next, the operation of the trickling filter type bioreactor having such a configuration will be described.

First, when the exhaust fan 12 of the exhaust line 11 is driven to sufficiently supply oxygen to the aerobic microorganisms in the microorganism-filled layer 4 and raw water is supplied from the raw water line 2 into the reactor main body 1, the raw water becomes From the top 6a of the umbrella-shaped watering member 6, the side surface of the watering member 6 spreads radially and flows. At that time, most of the water flows through a plurality of holes formed in the watering member 6 and falls as it is to the raw water dispersion layer 8 side. Sprinkled water.

Next, as shown in FIG. 2, the raw water that has fallen to the raw water dispersion layer 8 first reaches the spherical bodies 7, 7,... Spreads and flows toward the lower spherical bodies 7, 7,..., And further spreads on the surfaces of these spherical bodies 7, 7,. Sprinkled on layer 4.

That is, the raw water that has dropped on the water sprinkling member 6 in a patch-like manner passes through the raw water dispersion layer 8 on which a large number of spheres 7 are spread, and is further finely dispersed, and then uniformly sprayed on the microorganism-filled layer 4 side. Will be done.

As a result, the raw water is evenly supplied to the aerobic microorganisms in the microorganism-packed layer 4, whereby efficient purification of the raw water by the aerobic microorganisms is achieved.

Next, if such raw water treatment is continued for a long time, the growth substrate and impurities in the raw water will eventually adhere to the surface of the spheres 7 constituting the microorganism-packed layer 4, and each sphere 7, 7,.
It is conceivable that the gap between them is closed and the raw water dispersion layer 8 is clogged. However, as described above, since the spherical body 7 is formed of a material having a lower specific gravity than raw water such as ping-pong balls and foams, as shown in FIG. When the pool M is formed on the raw water dispersion layer 8 and the pool M is formed, the surrounding spherical body 7 moves so as to float on the portion where the pool M is formed by the buoyancy.

Accordingly, the spherical body 7 near the water pool M
Are separated from each other to form a large gap, and the pool of raw water and the deposits on the surface of the spherical body 7 are flowed from this gap toward the raw water dispersion layer 8 to eliminate clogging.

Therefore, clogging is unlikely to occur over a long period of time, and the frequency of cleaning work and replacement work can be greatly reduced.

The raw water uniformly sprinkled on the microorganism-packed layer 4 as described above contains organic matter and the like contained by the aerobic microorganisms that are growing when passing through the microorganism-packed layer 4 as in the conventional case. After being decomposed and purified, the water is discharged from the drain line 3 to the outside of the reactor main body 1 and discharged to a river as it is, or necessary post-treatment is performed by another facility.

[0030]

In summary, according to the present invention, since the raw water dispersing layer in which spheres are spread over the microorganism-packed layer in which microorganisms are growing is provided, the supplied raw water is supplied in an uneven state. Even if it does, it becomes possible to sprinkle water uniformly on the microorganism-packed layer. Therefore, since the raw water is uniformly supplied to the microorganism-packed layer, efficient raw water purification is achieved. In addition, since the raw water dispersion layer is formed of a spherical body having a specific gravity smaller than that of water, even if clogging occurs in the raw water dispersion layer, the gaps between the respective spherical bodies are enlarged by moving the spherical bodies so that the spherical bodies float and clog. , Etc. can be easily eliminated.

Further, the structure is very simple, and no power is required for watering, so that low-cost and high-efficiency processing can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a partially enlarged view showing an embodiment of a raw water dispersion layer.

FIG. 3 is a partially broken view showing an embodiment of a spherical body constituting a raw water dispersion layer.

FIG. 4 is a partially enlarged view showing an operation of a spherical body constituting a raw water dispersion layer.

FIG. 5 is a longitudinal sectional view showing a configuration of a conventional trickling filter type bioreactor.

FIG. 6A is a conceptual diagram showing the operation of an umbrella-shaped watering member. (B) is a perspective view showing an umbrella-shaped watering member.

FIG. 7 is a conceptual diagram showing the operation of an umbrella-shaped watering member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor main body 2 Raw water line 3 Drainage line 4 Microorganism filling layer 6 Sprinkling member 7 Spherical body 8 Raw water dispersion layer 9 Upper support member

Claims (1)

[Claims] 1. A sprinkling filter type bioreactor, in which raw water is passed from above to purify a microorganism-packed layer accommodated in a reactor main body and purified therefrom, a porous material passing the raw water above the microorganism-packed layer. While bridging the upper support member consisting of a plate or a mesh, on this upper support member,
A sprinkling filter type bioreactor, wherein a raw water dispersion layer is formed by laying a large number of spherical bodies having a specific gravity smaller than the raw water in layers.