KR20180031806A - Apparatus for biologically treating organic effluent - Google Patents

Abstract

There is provided a biological treatment apparatus for organic wastewater which is easy to construct and which can reduce the height of the work and save space.
An apparatus for biological treatment of organic wastewater in a multi-stage biological treatment tank, characterized in that in the biological treatment tank (1) of the first stage, a first biological treated water in which dispersed microorganisms are increased by decomposition of organic matters by dispersed bacteria is produced , And in the second biological treatment tank (2) at the rear end, the dispersed microorganism is prey to the animal. The first biological treatment tank 1 and the second biological treatment tank 2 each have a column body 10, 20 of the same shape and the same size, and the height of the column body is 6 to 11 m. The ratio is 1.5 to 5.0.

Description

[0001] APPARATUS FOR BIOLOGICALLY TREATING ORGANIC EFFLUENT [0002]

TECHNICAL FIELD The present invention relates to an apparatus for biological treatment of organic wastewater which can be widely used for the treatment of organic wastewater such as domestic wastewater, sewage, food factory, pulp factory, semiconductor manufacturing wastewater, liquid crystal manufacturing wastewater, To a biological treatment apparatus for organic wastewater having a treatment tower. The present invention also relates to a biological treatment method of organic wastewater using this treatment apparatus.

The activated sludge method used in the biological treatment of organic wastewater is widely used for sewage treatment and industrial wastewater treatment, for example, in terms of favorable treatment quality and easy maintenance. However, since the BOD volume load in the activated sludge process is generally about 0.5 to 0.8 kg / m 3 / d, a large site area is required. Also, since 20 to 40% of the decomposed BOD is converted into cells, that is, sludge, a large amount of surplus sludge treatment also becomes a problem.

As a method for carrying out a high load treatment of organic wastewater, a fluidized bed method in which a carrier is added is known. When this method is used, it is possible to operate at a BOD volume load of 3 kg / m 3 / d or more. However, in this method, the amount of generated sludge is about 30 to 50% of the decomposed BOD, which is higher than the conventional activated sludge process.

Patent Document 1 discloses a method in which organic wastewater is first treated with bacteria in a first treatment tank to oxidize and decompose the organic matter contained in wastewater and converted into cells of non-cohesive bacteria, It is possible to reduce the amount of surplus sludge by predation. In this method, high-load operation is possible, and the treatment efficiency of the activated sludge process is also improved.

Thus, many methods for treating wastewater using predators of protozoa and welfare animals located in high places of bacteria have been devised. For example, Patent Document 2 discloses a countermeasure against deterioration of treatment performance due to fluctuation of water quality of raw water which is a problem in the treatment method of Patent Document 1. [ As a specific method, "the BOD variation of the water to be treated is adjusted to be within 50% from the median of the average concentration", "the water quality of the first treatment tank and the first treated water is measured with time", " When the water quality deteriorates, the microbial agent or sludge is added to the first treatment tank. &Quot;

Patent Document 3 discloses a floc size of a flock which is predrawn by ultrasonic treatment or mechanical stirring when predation of bacteria, yeast, actinomycetes, algae, fungi and wastewater treated second sludge or surplus sludge into protozoa or worms Is smaller than the mouth of the animal.

Patent Document 4 discloses a biological treatment method of organic wastewater by multi-stage treatment of a fluidized bed and an activated sludge process. In this method, the activated sludge process at the subsequent stage is operated at a low load of BOD sludge load of 0.1 kg-BOD / kg-MLSS / d, whereby the sludge is self-oxidized, and the sludge emission amount can be greatly reduced.

When the aerobic biological treatment tank of the fluidized bed type is newly installed to start the operation, a new fluidized bed carrier is introduced into the tank to start the aeration. At this time, when the entire amount of the carrier is put into the vessel at the same time, almost all of the carrier does not flow while most of the carrier is floating. This is because the carrier is made of a material having a volume specific gravity of less than 1, such as a sponge. Therefore, conventionally, the carrier is injected little by little into the tank at a different injection timing, and the carrier is caused to flow by the aeration while suppressing the floating of the carrier, and it takes a long time to input the entire amount of the carrier.

Concrete water tanks or tower-like high water tanks are used as the crude of conventional biological treatment tanks.

Concrete tanks have the following challenges.

i) The construction of the main body becomes the local civil engineering work, and the installation of the internal equipment becomes after the construction work, and the construction period on the site becomes longer. Uneasiness remains in terms of construction and quality control.

ii) Since the depth of water is usually about 4 m in practical use, the installation space on the site increases.

iii) Even if the facility is to be increased in response to an increase in the raw water load, it is not easy to expand the facility because it is a local engineering work and the installation area is large.

iv) It is difficult to check the liquid leakage from the bottom.

v) inner surface lining repair is required.

There are the following tasks in the tower high water tank.

vi) In order to secure the capacity while suppressing the installation space, it is necessary to increase the height of the bath and at least 7 m is required. In this case, it is necessary to climb to the upper part of the tank when constructing local piping and daily maintenance, and usually, stairs and ladder are installed. This leads to poor workability.

vii) The burden of the upper connection piping construction from the upper part of the trench in the field is likely to increase.

viii) Depending on the bath material or the liquid material, it is necessary to perform maintenance on the inner surface lining.

Japanese Laid-Open Patent Publication No. 55-20649 Japanese Patent Application Laid-Open No. 2000-210692 Japanese Patent Publication No. 60-23832 Japanese Patent No. 3410699

As described above, the conventional concrete water tank or tower water tank has the following problems.

1) In concrete water tank, installation plane is large.

2) The construction period is longer in the concrete tank.

3) In a concrete water tank, it is not easy to enhance facilities.

4) In a tower type water tank with a high tank height, work efficiency is bad due to high work, and it is necessary to improve workability and prevent falling accident.

5) In a tower type water tank with a high tank height, piping from the tank top to the outside will occur and burden on the local construction will increase, so it is necessary to simplify local construction.

[Invention I]

The present invention (I) is intended to provide an apparatus for biological treatment of organic wastewater and a treatment method, which can facilitate the construction, and can reduce the heightening work and space.

Further, the present invention (I) aims at providing an apparatus for biological treatment of organic wastewater and a treatment method capable of easily coping with fluctuation of various raw water quality, required water quality, and increase in treated water.

An apparatus for biological treatment of organic wastewater according to the present invention (I) is an apparatus for biological treatment of organic wastewater in a biological treatment tank formed in multi-stages. In the first biological treatment tank, dispersed germs are increased by decomposition of organic matter by dispersed germs A biological treatment apparatus for organic wastewater which generates first biological treatment water and generates second biological treatment water in a second biological treatment tank at a subsequent stage, wherein the first biological treatment tank and the second biological treatment tank have the same shape and the same size And the height of the column is 6 to 11 m.

In the present invention (I), the ratio (H / D) of the height (H) to the diameter (D) of the column is preferably 1.5 to 5.0. Further, in the present invention, it is preferable that the installation height TOP of the manhole or the pipe connecting portion of at least half, for example, is not more than 3 m.

In the present invention, a plurality of the first biological treatment tank and the second biological treatment tank may be provided in parallel.

In the present invention, the column is made of FRP and is preferably integrally formed integrally from the column bottom to the column top.

In this case, the thickness of the lower portion of the column is preferably larger than the thickness of the upper portion of the column. It is preferable that at least a part of the vertical piping is semi-cylindrical and is adhered to the inner circumferential surface of the column.

The biological treatment method of organic wastewater of the present invention uses such a biological treatment apparatus of the present invention.

The apparatus for treating organic wastewater according to the present invention has a plurality of water treatment units each having a column of a standard size (same shape, same size), and each water treatment unit can be manufactured in advance in a factory.

In the present invention, since the sizes of the respective groups are unified, the design and construction of the apparatus are made common so that the apparatus can be used in a simple and quick manner. Also, the space between the groups can be made small. Furthermore, it is easy to add biological treatment tank.

By constructing the column body integrally with the FRP, it becomes light in weight and facilitates transportation and installation work. In this case, by increasing the thickness of the lower portion of the column, strength, pressure resistance, and durability of the column can be increased. In addition, by making the up and down piping cylinders counteract and adhering to the inner circumferential surface of the column body, the internal structure of the column body can be simplified, and the circulation flow of water inside the column body can be smooth. Further, the installation strength of the vertical piping also increases.

In one aspect of the present invention, since the joint portion or the manhole of most of the piping is formed at the lower portion of the column body (the height of the ground is 4 m or less), the number of complaints is small.

In one embodiment of the present invention, a biological treatment tank is formed in a multi-stage so that the biological treatment tank at the front end is a dispersion tank for converting an organic matter into an dispersed microorganism. In the biological treatment tank at the final stage, Type animal as a scaffold. In this treatment, the animalcules can be stably maintained and the quality of the treated water can be stabilized.

[Invention II]

The present invention (II) aims to provide a method of operating a biological treatment tank and a method of treating organic wastewater, wherein the carrier can be caused to flow at an early stage at the start of operation, and the startup time is short.

In addition, the present invention (II) aims to provide an apparatus for treating organic wastewater which can easily cope with fluctuation of various raw water quality, required water quality, and increase in treated water.

In the method of operating the biological treatment tank of the present invention (II), a fluidized bed support having a volume specific gravity smaller than 1 is charged into the biological treatment tank, and aeration is carried out from a scattering tube formed in the bottom of the biological treatment tank A method of starting operation of a biological treatment tank in which a carrier is flown is characterized in that aeration is formed from an air diffusing pipe formed on one half side of a bottom portion of the biological treatment tank to form a circulation flow in the up- .

In the present invention (II), it may be sprinkled in a column. In this case, defoaming agent-containing water may be sprinkled.

In the present invention (II), it is preferable that the biological treatment tank is composed of a tubular body having a height (H) to a diameter (D) ratio (H / D) of 1.5 to 5.0.

The method for biological treatment of organic wastewater according to the present invention (II) is characterized in that at least one biological treatment tank is activated by the operation method of the present invention in the biological treatment of biological wastewater in a multi-stage biological treatment tank .

In the present invention (II), in the first biological treatment tank, first biological treatment water in which dispersed microorganisms are increased by decomposition of organic matter by dispersed bacteria is generated, and in the second biological treatment tank in the subsequent stage, . It is preferable that the first biological treatment tank and the second biological treatment tank have a columnar body of the same shape and the same size, and the height of the columnar body is 6 to 11 m.

In the present invention (II), a plurality of the first biological treatment tank and the second biological treatment tank may be provided in parallel.

As a method of operating the biological treatment tank of the present invention (II), aeration is performed from an aerosol formed at one half of the bottom of the biological treatment tank at the start of the biological treatment tank to form a circulation flow in the biological treatment tank Therefore, even a fluid phase carrier having a volume specific gravity smaller than 1 can flow quickly into the water. Therefore, the start of the biological treatment tank can be promoted.

By carrying out water spray in the biological treatment tank at this time, the fluidized bed carrier can be submerged and flowed earlier. In this case, by spraying the defoaming agent-containing water, it is possible to prevent the air bubble from being entangled with the carrier to float the carrier.

The method of the present invention is preferably applied to a case where the height (specific height) (H / D) of the biological treatment tank is large.

The apparatus for treating organic wastewater used in an embodiment of the present invention has a plurality of water treatment units each having a column of a standard size (same shape, same size), and each water treatment unit can be manufactured in advance in a factory. In addition, since the sizes of the respective groups are unified, the design and construction of the apparatus are made common so that they can be used easily and quickly. Also, the space between the groups can be made small. Further, the addition of the biological treatment tank is easy.

In one embodiment of the present invention, a biological treatment tank is formed in a multi-stage so that the biological treatment tank at the front end is a dispersion tank for converting an organic matter into an dispersed microorganism. In the biological treatment tank at the final stage, Type animal as a scaffold. In this treatment, the animalcules can be stably maintained and the quality of the treated water can be stabilized.

1 is a longitudinal sectional view of an organic wastewater biological treatment apparatus according to an embodiment of the invention (I).
Fig. 2 is a view seen from the direction of arrows II-II in Fig.
3 is a view seen in the direction of arrows III-III in Fig.
4 (a) to 4 (h) are plan views showing an example of arrangement of a water treatment unit in the biological treatment apparatus for organic wastewater of the present invention.
5 is a longitudinal sectional view of an organic wastewater biological treatment apparatus according to another embodiment.
6 (a) is a sectional view taken along the line AA in Fig. 5, and Fig. 6 (b) is a sectional view taken along the line BB in Fig.
7 is a cross-sectional view taken along line VII-VII of FIG.
8 is a view seen in the direction of arrows VIII-VIII in Fig.
FIG. 9A is a configuration diagram showing another embodiment, and FIG. 9B is a sectional view taken along line IXb-IXb in FIG. 9A.
10 is a configuration diagram showing still another embodiment.
11 is a longitudinal sectional view of the biological treatment apparatus for organic wastewater according to the embodiment of the invention (II).

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the biological treatment apparatus and treatment method of organic wastewater of the present invention (I) will be described in detail with reference to the drawings. Fig. 1 shows an embodiment of the biological treatment apparatus for organic wastewater according to the present invention (I), wherein the first biological treatment tank 1 and the second biological treatment tank 2 are erected on a foundation 3, And are connected in series by a pipe 4.

The first biological treatment tank 1 is composed of a cylindrical body 10 and a raw water inlet 11a having a flange structure formed on the lower side of the body 10 and a raw water inlet 11b connected to the raw water inlet 11a, A raw water introducing pipe 11 extending upward from the outlet 10a and opening upward from the outlet 14a; an air diffuser 12 formed at the bottom of the inside of the header 10; A stationary or swing bed carrier 13 provided on the upper side of the diffuser 12 and an outlet 14a for the treated water formed on the upper side of the column 10 and the like. The air diffuser 12 is connected to a blower (not shown) as a gas supply device. Here, when the water level is high, it is preferable that the blower is a high-pressure blower having a capability of a discharge pressure of 60 kPa or more such as a screw blower or a turbo blower.

And an outlet pipe 14 is connected to the outlet 14a. The outflow pipe 14 extends downward along the outer surface of the body 10, and the lower end thereof is a pipe connecting portion 14b having a flange structure. As shown in Fig. 2, a bent portion 14c on the crank is formed on the way of the outflow pipe 14 in the vertical direction.

An opening 15a is formed at the top of the column 10, and one end of the atmospheric communication pipe 15 is connected. As shown in Fig. 2, the atmospheric communication pipe 15 is formed by extending the outer surface of the body 10 downward along the body 10, and the lower end 15b is opened downward near the base 3 have. The upper end of the outflow pipe 14 communicates with the horizontal pulling portion 15b of the atmospheric communication pipe 15 through the inverted U-shaped communicating pipe 14d.

2, a preliminary seat 16 is formed at the top of the column 10, and a manhole 17 and a preliminary seat 18 are formed at the bottom.

The second biological treatment tank 2 includes a cylindrical body 20 having the same shape and size as those of the body 10 and an inlet 21 having a flange structure formed on the lower side of the body 20, 20 and a strainer 23 provided in the middle of the upper portion of the body 20 in the vertical direction or below. And the inlet 21 is connected to the pipe connecting portion 14b through the pipe 4. [ The air diffuser 22 is connected to a blower (not shown). This blower is used in common with a blower for supplying air to the air diffuser 12.

And the outflow pipe 24 is connected to the strainer 23. 3, the outflow pipe 24 has a raised portion 24a and a raised portion 24b which extend up to the same level as the outflow port 14a of the first biological treatment tank 1 along the outer surface of the columnar body 20, A horizontal pulling part 24b which is continuous on one end side of the granular part 24a and pulled in the horizontal direction and a second pulling part 24b which is continuous on the other end side of the horizontal pulling part 24b, And a lower mouth portion 24c extending down to the vicinity of the mouth portion 3. The lower end of the mouth lower portion 24c serves as an outlet 24d. An atmospheric release pipe 24e extends upward from the upper end of the rising portion 24a of the outflow pipe 24 and the upper end of the atmospheric release pipe 24e is open to the atmosphere. A curved portion 24f on the crank is formed in the middle of the mouth bottom 24c of the outflow pipe 24. [

An opening 25a is formed at the top of the column 20 and one end of the atmospheric communication pipe 25 is connected. 3, the atmosphere communicating pipe 25 is formed so that the outer surface of the body 20 extends downward along the body 20 and the lower end 25b is opened downward near the base 3 .

3, a preliminary seat 26 is formed at the top of the body 20, and a manhole 27, a preliminary seat 28 and an air supply pipe 22a to the air diffusing pipe are formed at the bottom. The bed body 20 is filled with a fluidized bed support 29. Reference numeral 27a denotes a manhole for maintenance of the strainer 23.

Resins such as FRP are preferable because laminating is not required for each of the plates 10 and 20, but it may be a steel plate depending on water quality. In the case of FRP, it is preferable to coat a weather-resistant paint (for example, a tungsten coat manufactured by Toro Co., Ltd.) for the purpose of preventing deterioration due to ultraviolet rays and improving corrosion resistance. When the bodies 10 and 20 are made of FRP, it is preferable to make the thickness of the lower part of the body larger than the upper part. The upper and lower portions of the column may be made slightly wider than the upper portion and the lower portion may be made even thicker.

In addition, in the first and second biological treatment tanks 1 and 2, an extraction tube for a surplus sludge, a drain tube, an insertion tube of a surveillance camera in a tank, a wire insertion opening (mouth), a sampling opening (not shown) And the like. Surveillance in the bath is performed by always or appropriately inserting a camera or a photographing substrate (preferably a lighted or infrared camera) having a movie photographing function into the bath. The photographing data is transmitted wirelessly or by wire. The photographing data may be stored in the photographing substrate. It is also possible to wrap the insulating material in advance on the column body.

If necessary, install measuring instruments such as water gauge, pressure gauge, flow meter, water temperature gauge, water quality gauge in the water tank, peripheral facilities, and piping, and use it for monitoring of operation situation, operation control, operation management. It is also used to optimize the treatment in the water tank by combining with additional facilities (for example, equipment having water supply, heating, chemical injection, aeration, dehydration, etc.).

(Organic wastewater) is introduced into the first biological treatment tank 1 through the raw water introduction pipe 11 and aeration is carried out in the anaerobic tank 12 through the raw water introduction pipe 11 in order to process the organic wastewater by the biological treatment apparatus of this organic wastewater , Dissolving more than 70%, preferably not less than 80%, more preferably not less than 85% of the organic component (soluble BOD) by dispersible bacteria (non-cohesive bacteria). The pH of the first biological treatment tank 1 is preferably 6 to 8.5. However, when raw water such as food manufacturing wastewater contains a large amount of oil components or organic wastewater or liquid crystal manufacturing wastewater contains a large amount of organic solvent or detergent, the pH is preferably 8 to 9 .

The water flow to the first biological treatment tank 1 is set to be a single-overflow formula. The BOD volume load of the first biological treatment tank 1 is set to 1 kg / m 3 / d or more, for example, 1 to 20 kg / m 3 / d, HRT (raw water retention time) , For example, 0.5 to 8 h, it is possible to obtain a treated water in which the dispersing bacteria are rightly ignited, and by shortening the HRT, the waste having a low BOD concentration can be treated at a high load.

A part of the sludge from the biological treatment tank at the downstream end is conveyed to the first biological treatment tank 1 or the support 13 is provided by setting the first biological treatment tank 1 in two or more stages, , And a high load treatment with a BOD volume load of 5 kg / m3 / d or more is also possible. The fluid carrier may be filled as the carrier.

When the carrier 13 is a serpentine carrier, the material is preferably a foamed synthetic resin, particularly a flexible polyurethane foam. When a porous sheet-like porous support such as a thin plate-like or elongated lightweight polyurethane foam is provided in the first biological treatment tank 1, the platelet carrier has sufficient resilience and is warped in the flow of water in the bath (Shape is not maintained), even if it is thin, it has sufficient mechanical strength and is not damaged. Further, the sludge-containing liquid is uniformly mixed evenly in the porous structure of the carrier without damaging the water in the tank by the warpage.

When the filling rate of the carrier in the first biological treatment tank 1 is high, no dispersed microorganisms are formed, and the microorganisms adhere to the carrier or multiply. Therefore, the filling rate of the carrier to be added to the first biological treatment tank 1 is 10% or less, for example, 1 to 10% in the case of the fluidized bed carrier, 5% or less in the case of the fixed bed carrier, To 0.5% to 5%, it becomes possible to generate dispersed bacteria which are easy to predominate without being affected by the concentration fluctuation.

The concentration of dissolved oxygen (DO) in the first biological treatment tank 1 may be set to 1 mg / L or less, preferably 0.5 mg / L or less, to suppress the growth of marsupial bacteria.

(The first biological treatment water) of the first biological treatment tank 1 is introduced into the second biological treatment tank 2 at the downstream stage through the outlet 14a, the pipes 14 and 4 and the inlet 21, And aerated, oxidative decomposition of remaining organic components, autolysis of dispersible bacteria, and reduction of excess sludge by predation of animalcules are carried out. The treatment liquid in the second biological treatment tank 2 is taken out through the strainer 23 and the outflow pipe 24.

In the second biological treatment tank 2, since the function of a small animal having a slower growth rate than that of a bacterium and the autolysis of a bacterium are utilized, it is necessary to use an operating condition and a treatment apparatus in which the animalcules and bacteria stay in the system . Thus, in this embodiment, the second biological treatment tank 2 is filled with the fluidized-bed carrier 29 to increase the holding amount of the animalcules in the tank.

The shape of the fluidized-bed carrier 29 is arbitrary such as spherical, pellet, and hollow, and is usually in the form of a mosaic or a plate, and has a size (diameter) of about 0.1 to 10 mm. The material of the carrier 29 may be a natural material, an inorganic material, a polymer material, or the like, and a gel material may be used. The carrier is not limited to a fluidized bed carrier, but may be any of a stationary phase carrier and a rotatable carrier, or two or more carriers may be used in combination.

In the second biological treatment tank 2, a large number of scaffolds for holding the animalcules are required. If the filling rate of the carrier excessively high, the lack of mixing in the tank and the decay of the sludge occur, It is preferably 0.5 to 30%, particularly 1 to 10%.

The pH of the second biological treatment tank 2 may be set to 7.0 or less in order to promote predation by the animalcules.

In the second biological treatment tank (2), not only the filtration predators of predominantly fungal cells in the dispersed state but also the aggregate predators of predominant species capable of predation of flocked sludge are proliferated. In the latter case, when the flock is swallowed, the sludge is swept away and becomes sludge (sludge with poor sedimentation) scattered in the finely divided flock pieces. In addition, clogging of the membrane occurs by the flock pieces in the film-type activated sludge method, in particular, in which the membrane is separated at the rear end. Therefore, it is preferable to control the SRT constantly within a range of 60 days or less, preferably 45 days or less, in order to remove aggregated predator-type small animal. In the case of less than 15 days, it is unnecessarily excessively frequent, so that the number of flocculation-type animalcules as well as the aggregate-predator-type animalcules is excessively decreased.

In the first biological treatment tank 1, it is necessary to decompose most of the organic matter, that is, 70% or more, preferably 80% or more of the drainage BOD, and convert it into microbial cells. In the first biological treatment tank 1, When the organic matter is completely decomposed, flocs are not formed in the second biological treatment tank 2, and nutrients for animal animal breeding are also insufficient, so that only sludge having low compaction (poor sedimentation sludge) Treatment group. Therefore, a part of the raw water is bypassed to the second biological treatment tank 2, and the sludge load based on the soluble BOD to the second biological treatment tank 2 is 0.025 kg-BOD / kg-MLSS / d or more . The MLSS at this time includes the MLSS of the carrier adherend.

In order to obtain a higher quality of treated water from treated water taken out from the second biological treatment tank 2 through the strainer 23 and the piping 24, any of solid-liquid separation, membrane separation, coagulation sedimentation, . Further, when carrying out coagulation sedimentation or pressurization, the addition amount of the flocculant can be reduced. The sedimentation separation water from the second biological treatment tank 2 may be subjected to coagulation treatment in the coagulation tank and then to precipitation treatment in the solid-liquid separation tank (sedimentation tank) to separate the treated water and sedimentation sludge.

The backwashing air supply pipe may be connected to the pipe 24 in order to remove the foreign matter adhered to the strainer 23. In this way, even if the strainer 23 is installed in the lower part of the tower, the deposit can be easily removed. In addition, by installing the strainer 23 in the lower part of the column body, it is possible to prevent floating foreign substances such as oils and the like from adhering to the strainer.

5 to 8, an organic wastewater biological treatment apparatus according to another embodiment of the present invention will be described. 5, the first biological treatment tank 41 and the second biological treatment tank 42 are formed upright on the foundation 43, and the biological treatment tank 41 is supported by the piping 70 And are connected in series.

The first biological treatment tank 41 has a cylindrical body 50 made of FRP, a raw water (for-treatment water) inlet 51a having a flange structure formed on the lower side of the body 50, A raw water introducing pipe 51 which is continuous to the upper surface of the body 50 and extends upwardly along the inner circumferential surface of the body 50 and whose upper end is opened above the water surface, An air pipe 53 connecting the air diffuser 52 to a blower (not shown), a siphon brake pipe 53A continuous on the way of the air pipe 53, A connecting pipe 55 connecting the strainer 54 to each other, a treated water outlet 56 communicating with the connecting pipe 55 and a plurality of strainer 54 connected to the strainer 54, A drain pipe 57 extending in the vertical direction along the inner peripheral surface, Age pipe 58 of the defoaming agent to the aqueous solution formed, and the like.

An opening 50a is formed at the top of the column 50 so that the inside of the column 50 communicates with the atmosphere through the opening 50a.

6 (a), the raw water introduction pipe 51 is adhered to the inner circumferential surface of the columnar body 50. The upper end of the raw water introduction pipe 51 is opened into the column 50 above the water surface as described above. The lower end of the raw water introduction pipe 51 is sealed. A raw water inlet port 51a formed to penetrate the lower side wall of the column 50 communicates with the lower end portion of the raw water supply pipe 51. [

The air pipe 53 has one end protruding out of the body 50 through a lower portion of the body 50 and an air supply pipe from the blower is connected to the tip of the body. And the other end of the air pipe 53 is connected to the air diffusing pipe 52.

The air piping 53 is located above the water surface in the tower 50 and one end of the siphon brake pipe 53A is connected to the standing upper end 53b. The siphon brake pipe 53A extends downward in the body 50 and the other end protrudes beyond the body 50 through the lower portion of the body 50. [ A valve 53a is formed at the tip of the siphon brake pipe 53A.

The strainer 54 is provided in the vicinity of the middle in the vertical direction of the column 50 or below. 7, the strainer 54 has a box 54a mounted by being adhered to the inner peripheral surface of the body 50, and a screen 54b composed of a wedge wire or the like formed on the front surface of the box 54a . The rear face of the box 54a is open and the rear end of the box 54a is bonded to the inner peripheral face of the body 50. [

In this embodiment, two strainer 54 are vertically separated from each other, and the inside of each strainer 54 is communicated by a connection pipe 55.

The connection pipe 55 is also adhered to the inner peripheral surface of the columnar body 50 in an opposite manner. The treated water outlet 56 communicates with the connection pipe 55 through an opening formed in the column 50.

Although not shown, a hand hole is formed in the column 50 in order to maintain the inside of the strainer 54.

The drain pipe 57 extends vertically along the inner circumferential surface of the column 50. 6 (b), except for the uppermost portion, the drain pipe 57 is adhered to the inner peripheral surface of the body 50. [ The uppermost portion of the drain pipe 57 is cylindrical and is opened into the column 50 above the water surface. The lower end of the drain pipe 57 communicates with the drain pipe 57 at the lower portion of the column body 50.

The water injection pipe 58 of the defoaming agent flows in the vertical direction within the column 50 and the upper end is curved downward in a substantially U shape to be opened downward above the water surface in the column 50 have. The lower end of the main water pipe 58 protrudes out of the column body 50 through the column body 50.

The second biological treatment tank 42 includes all the components of the first biological treatment tank 41 and the same reference numerals are assigned to the same parts as the first biological treatment tank 41. [

The second biological treatment tank 42 is provided with a treated water outlet pipe 60 connected to the treated water outlet 56 in addition to the above-described configuration of the first biological treatment tank 41. The treated water takeout pipe 60 goes upward from the outside of the column 50 and then passes through the side wall of the column 50 and is pushed into the column 50, A horizontal pulling portion 62 which is continuous in one end side and pulled in the horizontal direction and is continuous to the other end side of the horizontal pulling portion 62 And a lower mouth portion 63 which extends to the lower portion in the body 50 and protrudes out of the body 50. The distal end of the mouth lower portion 63 serves as an outlet 64. [

The upper end 61a of the rising portion 61 curves downward and opens into the top 50. Therefore, the level of the horizontal pulling portion 62 becomes the water level in the second biological treatment tank 42. Since the outlet 56 of the first biological treatment tank 41 is communicated with the inlet 51a of the second biological treatment tank 42 by the piping 70, The sleep level becomes equal to the sleep level of the second biological treatment tank 42.

6 (b), the granular portion 61 and the mouth lower portion 63 extend in the vertical direction along the inner peripheral surface of the columnar body 50. As shown in Fig. The granular portion 61 and the mouth bottom 63 are semi-cylindrical and connected to the inner peripheral surface of the columnar body 50.

Two valves 66 and 67 are formed in the portion of the piping 60 that travels outside the column 50. An air supply pipe 68 having a valve 68a is connected between the valves 66 and 67. [ Between the valves 66 and 67, a sampling pipe 69 for extracting the sample water is connected. And a valve 69a is formed in this pipe 69. [

Two valves 71 and 72 are formed in a pipe 70 connecting the treated water outlet 56 of the first biological treatment tank 41 and the inlet 51a of the second biological treatment tank 42. Between the valves 71 and 72, an air supply pipe 73 having a valve 74 is connected.

Although not shown, the first and second biological treatment tanks 41 and 42 are provided with an extraction tube for surplus sludge, an insertion tube for a surveillance camera, a wire insertion opening, a manhole, Respectively.

The first and second biological treatment tanks 41 and 42 are filled with a fluidized-bed carrier. As this fluidized bed carrier, the same ones as those in the above embodiment can be used.

(Organic wastewater) is introduced into the first biological treatment tank 41 through the introduction pipe 51 of the first biological treatment tank 41 to treat the organic wastewater by this organic wastewater treatment apparatus, It aerated in the engine 52 and oxidatively decomposes 70% or more, preferably 80% or more, more preferably 85% or more of the organic component (soluble BOD) by dispersible bacteria (non-coagulating bacteria). In the aeration, the valve 53a of the pipe 53A is closed. Preferable conditions such as the pH, the BOD volume load, the filling rate of the carrier, and the dissolved oxygen (DO) concentration of the first biological treatment tank 41 are the same as those of the embodiments of Figs.

The treated water (first biological treatment water) of the first biological treatment tank 41 is introduced from the outlet 56 into the second biological treatment tank 42 at the rear stage through the piping 70 and aerated to remain Oxidative decomposition of organic components, autolysis of dispersible bacteria, and reduction of surplus sludge by predation of animalcules. At this time, the valves 71 and 72 of the pipe 70 and the valves 66 and 67 of the pipe 60 are opened.

The filling rate of the second carrier in the second biological treatment tank 42 and the sludge load due to pH, SRT, and soluble BOD are the same as in the above embodiment.

The air when the aeration is carried out in the first and second biological treatment tanks 41, 42 is discharged to the outside of the tower from the opening 50a of the top plate. The bubbles generated in the aeration are discharged to the drain pit outside the column body 50 through the pipe 57. A bubble sensor is formed on the drain pit. When the bubble is large, a defoaming agent or water is injected.

In this embodiment, when clogging of the screen 54b of the strainer 54 of the first biological treatment tank 41 occurs, the valve 72 is closed, the valve 74 is opened, Air is supplied from the first biological treatment tank 73 to the strainer 54 of the first biological treatment tank 41 and is backwashed. When the clogging of the screen 54b of the strainer 54 of the second biological treatment tank 42 occurs, the valve 67 is closed, the valve 68a is opened, and air is supplied from the air pipe 68 Is supplied into the strainer (54) of the second biological treatment tank (42) and backwashed. Since the strainer 54 can be easily cleaned by air in this way, even if the strainer 54 is installed in the lower portion of the tower, the strainer 54 can be cleaned easily. By installing the strainer 54 in the lower part of the column body, it is prevented that floating foreign substances such as oil are adhered to the strainer 54.

When the operation of the biological treatment apparatus is stopped, the valves 53a are opened to prevent the water in the biological treatment tanks 41, 42 from flowing backward in the pipe 53 by the siphon phenomenon.

In the embodiment shown in Figs. 5 to 8, the strainer 54 is provided at the upper and lower two stages, but the strainer 54 may be provided at one stage or three stages or more. A plurality of strainer may be formed at the same level. Examples thereof are shown in Figs. 9 (a), (b) and 10.

9 (a) and 9 (b), two strainer 54 and 54 are installed at the same level, their lower portions are connected to each other by a pipe 55, 56 are formed. 9A is a side view of a portion of the column 50 on which the strainer 54 is formed and FIG. 9B is a sectional view taken along line IXb-IXb of FIG. 9A.

In Fig. 10, the two strainer 54, 54 are installed at the same level, and the treated water outlet pipes 80, 80 are respectively connected to the lower portions thereof. The pipes 80 and 80 move upwards and join together in the top body 50 to form a granular part. The lower ends of the pipings 80 and 80 are connected to the outlet 56 through a horizontal pulling part. 10 is a side view of a portion of the column 50 on which the strainer 54 is formed.

Figs. 1 to 3 and 5 to 10 show examples of the embodiments of the present invention, and the present invention is not limited to those shown below. For example, the third biological treatment tank may be formed at the rear end of the first biological treatment tank (1, 41) or the second biological treatment tank (2, 42) to form the biological treatment tank in three or more stages.

4 (a) to 4 (h) are plan views showing various arrangement patterns of the first biological treatment tank 1 and the second biological treatment tank 2. Fig. 4 (a) shows one set of the first biological treatment tank 1 and the second biological treatment tank 2, which are connected in series. Fig. 4 (b) shows that the first biological treatment tank 1 is installed in one stage and a plurality of second biological treatment tanks 2 are provided in parallel. FIG. 4C shows a configuration in which a plurality of first biological treatment tanks 1 are provided in parallel and one second biological treatment tank 2 is installed. Fig. 4 (d) shows a series connection of the first biological treatment tank 1 and the second biological treatment tank 2 in a plurality of rows.

4 (e) and 4 (f) show that a plurality of first biological treatment tanks 1 are provided in parallel and a plurality of second biological treatment tanks 2 are provided in parallel, , The number of first biological treatment tanks 1 is larger than that of the second biological treatment tanks 2 and the number of second biological treatment tanks 2 is larger than that of the first biological treatment tanks 1 . Although not shown, the number of the first biological treatment tank 1 and the number of the second biological treatment tank 2 may be the same.

FIG. 4 (g) shows a plurality of second biological treatment tanks 2, 2 'installed in series. FIG. 4 (h) shows a plurality of the devices shown in FIG. 4 (g) arranged in parallel.

When the first biological treatment tank or the second biological treatment tank is provided in parallel, the operation is stopped in some of the first biological treatment tank or the second biological treatment tank and the remaining first biological treatment tank and the second biological treatment tank It is also possible to continue the operation of the apparatus for treating organic wastewater.

4 (a) to 4 (h), according to the present invention, the first biological treatment tank 1 and the second biological treatment tank 2 can be provided in various patterns, Depending on the water quality, the desired arrangement can be achieved. In addition, at least one of the first biological treatment tank and the second biological treatment tank may be additionally provided in parallel or in series to the apparatus for treating organic wastewater according to the present invention, so that it is possible to cope with an increase in the raw water flow rate and water quality fluctuation.

In the present invention, since the first and second biological treatment tanks 1 and 2 and the bodies of the first and second biological treatment tanks 41 and 42 have the same shape and the same size, even when a plurality of biological treatment tanks are provided, So that the space between the column bodies can be reduced and the installation space of the entire organic wastewater treatment apparatus can be reduced. In addition, the manufacturing cost of the column body becomes low. In the case where a plurality of the columns are installed in parallel, since the configurations of the columns are the same, the installation work of the column body and the piping connection work of the respective columns are the same, and the working efficiency is improved and the construction period can be shortened.

Each of the supports 10, 20 and 50 has a diameter of 2.2 to 3.6 m, in particular of 2.4 to 3.3 m, a height of 6 to 11 m, in particular of 8 to 11 m and a ratio of height H to diameter D H / D) of 1.5 to 5.0, particularly 3.0 to 4.5. The height of the connecting portion of the main pipe, the manholes 17 and 27, the carrier 13, the strainer 23 and 54, the air diffusers 12, 22 and 52, Particularly preferably 3.0 m or less. By forming the connecting portions, the manholes 17 and 27, the carrier 13, the strainer 23 and 54 and the diffuser 12, 22 and 52 at low positions, the piping connection work, The work is not a job for complaints, and work efficiency and safety are improved.

In the present invention, the anaerobic treatment tank may be provided at the front end of the first biological treatment tank (1, 41), and the treated water of the anaerobic treatment tank may be introduced into the first biological treatment tank. The size of the column of the anaerobic treatment tank may be the same as that of the column bodies 10, 20 or the column body 50.

In the present invention, the adjustment tank may be provided at the foremost end of the anaerobic or aerobic treatment tank. The adjustment tank includes, for example, a raw water tank for leveling the raw water flow rate, a sedimentation accelerator for sedimenting solid matter, a pressurized floating apparatus, and the like.

In the present invention, it is preferable that each biological treatment tank is constructed so that an attached device such as a diffuser or the like is previously mounted on a tower and transferred to a site to be installed on a foundation. Thereby, the number of field operations can be reduced, shortening the construction period and improving the assembly precision.

In the present invention, the distance between the inlet of the raw water (for-treatment water) and the outlet of the treated water in the biological treatment tank, that is, the distance between the upper end of the raw water supply pipe 11 and the outlet 14a in Figs. 8, the distance between the upper end of the raw water inlet pipe 51 and the strainer 54 (upper side) is preferably 1.5 m or more, particularly 2 m or more. With this configuration, the ratio of short-circuit currents is reduced, and the decomposition time of COD can be sufficiently secured.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the biological treatment apparatus for organic wastewater of the present invention (II) will be described in detail with reference to the drawings. 11 shows an embodiment of the biological treatment apparatus for organic wastewater according to the present invention (II), wherein the first biological treatment tank 101 and the second biological treatment tank 102 are erected on a foundation 103 And the piping 104, as shown in Fig.

The first biological treatment tank 101 has a cylindrical body 110 and a raw water inlet 111a having a flange structure formed on the lower side of the body 110 and a raw water inlet 111a continuous with the raw water inlet 111a, A raw water introducing pipe 111 extending upward in the upper part of the body 110 and having an upper end opened above the water surface; A mouth box 114 which is connected to the screen box 113 and whose upper end is opened above the water surface and a mouth box 114 which is opened from the side near the upper end of the mouth box 114 An outflow pipe 115 descending in the body 110 and pulled out of the body 110 at a lower portion of the body 110 and a water sprayer 116 formed at an upper portion of the body 110. [

The level of the upper end portion 115a of the outflow pipe 115 becomes above the water surface in the column body 110. [ And the pipe 104 is connected to the end 115b of the outflow pipe 115. [

The bed body 110 is filled with a liquid phase carrier C. The front surface of the screen box 113, which is oriented toward the center in the tower 110, is a screen surface made of a wedge wire or the like. The carrier C is prevented from passing through the screen surface.

The diffuser 112a is disposed on one half side of the bottom surface of the mount 110 and the diffuser 112b is disposed on the other half side of the bottom surface. When the bottom surface of the mount 110 is divided into two with the halfway between the one half of the diffuser 112a and the other half of the diffuser 112b, The area is set to 15 to 50%, preferably 20 to 45% of the area of the bottom surface of the columnar body 110.

An opening 117a is formed at the top of the column 110 and one end of the atmospheric communication pipe 117 is connected. The atmospheric communicating tube 117 extends downward through the inside of the tower 110 and is pulled out of the tower 110 near the bottom 103 and opened toward the atmosphere.

Although not shown, a preliminary seat is formed at the top of the body 110, and a manhole and a preliminary seat are formed at the bottom.

The second biological treatment tank 102 includes a cylindrical body 120 having the same shape and size as those of the body 110, an inlet 121 having a flange structure formed on the lower side of the body 120, And a lower end of the strainer 123 is connected to the strainer 123. The upper end of the strainer 123 is connected to a water surface And is lowered from the side near the upper end of the mouthpiece 124 and lowered inside the bed body 120 and is pulled out of the bed body 120 at the lower part of the bed body 120 And a sprinkler 126 formed at the upper portion of the columnar body 120,

The level of the upper end portion 125a of the outflow pipe 125 becomes above the water surface in the column body 120. [

The bed body (120) is filled with a fluidized bed carrier (C). The carrier C can not pass through the strainer 123.

The diffusing pipe 122a is disposed on one half side of the bottom surface of the columnar body 120 and the diffusing pipe 122b is disposed on the other half side of the bottom surface thereof. When the bottom surface of the body 120 is divided into two parts with the boundary between the one half side where the diffuser 122a is disposed and the other half side where the diffuser 122b is disposed, Is 15 to 50%, preferably 20 to 45% of the area of the bottom surface of the columnar body 120.

The air diffusers 112a, 112b, 122a, and 122b are connected to a blower (not shown) through a valve (not shown). As the blower, when the water level is high, it is preferable to use a high-pressure blower having a capability of a discharge pressure of 60 kPa or more such as a screw blower or a turbo blower.

An opening 127a is formed at the top of the column 120, and one end of the atmospheric communication pipe 127 is connected. The atmospheric communication pipe 127 extends downward in the body 120 and the lower end 127e is pulled out of the body 120 in the immediate vicinity of the base 103 and opened toward the atmosphere.

On the top of the column 120, a preliminary left and right openings are formed, and a manhole and a preliminary left are formed at the bottom.

Resins such as FRP are preferable because laminating is not required for each of the plates 110 and 120, but it may be a steel plate depending on water quality. In the case of FRP, it is preferable to coat the weather-resistant paint for the purpose of preventing deterioration due to ultraviolet rays and improving corrosion resistance.

Further, in the first and second biological treatment tanks 101 and 102, an extraction tube for a surplus sludge, a drain tube, an insertion tube of a surveillance camera in the tank, a wire insertion opening, a sampling port (not shown), and the like are formed. Surveillance in the bath is performed by always or appropriately inserting a camera or a photographing substrate (preferably a lighted or infrared camera) having a movie photographing function into the bath. The photographing data is transmitted wirelessly or by wire. The photographing data may be stored in the photographing substrate. It is also possible to wrap the insulating material in advance on the column body.

If necessary, install measuring instruments such as water gauge, pressure gauge, flow meter, water temperature gauge, water quality gauge in the water tank, peripheral facilities, and piping, and use it for monitoring of operation situation, operation control, operation management. It is also used to optimize the treatment in the water tank by combining with additional facilities (for example, equipment having water supply, heating, chemical injection, aeration, dehydration, etc.).

(Organic wastewater) is introduced into the first biological treatment tank 101 through the introduction pipe 111 and the air is supplied from the air diffuser 112a or 112b to the first biological treatment tank 101. In order to treat the organic wastewater by this biological wastewater treatment apparatus, , 70% or more, preferably 80% or more, more preferably 85% or more of the organic component (soluble BOD) is decomposed by dispersible bacteria (non-cohesive bacteria). The pH of the first biological treatment tank 101 is preferably 6 to 8.5. However, when raw water such as food manufacturing wastewater contains a large amount of oil components or organic wastewater or liquid crystal manufacturing wastewater contains a large amount of organic solvent or detergent, the pH is preferably 8 to 9 .

The feed to the first biological treatment tank 101 is set to be a single feed. The BOD volume load of the first biological treatment tank 101 is set to 1 kg / m 3 / d or more, for example, 1 to 20 kg / m 3 / d, the HRT (raw water retention time) , For example, 0.5 to 8 h, the treated water in which the dispersing bacteria are ignited can be obtained. Further, by shortening the HRT, it is possible to treat the drain with low BOD concentration at high load.

A part of the sludge from the downstream biological treatment tank is conveyed to the first biological treatment tank 101 or the biological treatment load of 5 kg / m3 / d or higher.

In addition, the first biological treatment tank 101 may be provided with a fixed-bed carrier or a serpentine carrier. The material for the frostbite carrier is preferably a foamed synthetic resin, particularly a flexible polyurethane foam. When a porous sheet-like porous support such as a thin plate-like or elongated lightweight polyurethane foam is provided in the first biological treatment tank 101, the platelet carrier has sufficient resiliency and is warped in the flow of water in the bath (Shape is not maintained), even if it is thin, it has sufficient mechanical strength and is not damaged. Further, the sludge-containing liquid is uniformly mixed evenly in the porous structure of the carrier without damaging the water in the tank by the warpage.

When the filling rate of the carrier in the first biological treatment tank 101 is high, no dispersed bacteria are produced, and the bacteria adhere to the carrier or the satellitic bacteria multiply. Therefore, the filling rate of the carrier to be added to the first biological treatment tank 101 is 10% or less, for example, 1 to 10% in the case of the fluid phase carrier, 5% or less in the case of the fixed bed carrier, To 0.5% to 5%, it becomes possible to generate dispersed bacteria which are easy to predominate without being affected by the concentration fluctuation.

The concentration of dissolved oxygen (DO) in the first biological treatment tank 101 may be set to 1 mg / liter or less, preferably 0.5 mg / liter or less, to inhibit the growth of marsupial bacteria.

The treated water (first biological treatment water) of the first biological treatment tank 101 is introduced into the second biological treatment tank 102 at the downstream stage through the piping 114, 115 and 104 and the outlet 121, Oxidative decomposition of the remaining organic components, autolysis of dispersible bacteria, and reduction of surplus sludge by predation of animalcules.

In the second biological treatment tank 102, since the function of the animalcules with slower growth rate and the autolysis of the bacteria are used as compared with the bacteria, it is necessary to use the operating conditions and the treatment apparatus in which the animalcules and the bacteria stay in the system . Thus, in this embodiment, the second biological treatment tank 102 is filled with the fluidized-bed carrier C to increase the amount of the animalcules retained in the tank.

The shape of the fluidized-bed carrier (C) is arbitrary such as spherical, pellet, and hollow, and is usually about 0.1 to 10 mm in size (diameter). The material of the carrier (C) is arbitrary such as a natural material, an inorganic material, and a polymer material, and a gel material may be used. The carrier (C) has a volume specific gravity of less than 1 in a dry state, and is more preferably a sponge carrier.

In addition to the fluidized-bed carrier, the second biological treatment tank 102 may also be filled with a turbinate-like carrier.

In the second biological treatment tank 102, a large number of scaffolds for holding the animalcules are required. If the filling rate of the carrier excessively high, the lack of mixing in the tank and the decay of the sludge occur, It is preferably 0.5 to 30%, particularly 1 to 10%.

The pH of the second biological treatment tank 102 may be set to 7.0 or less in order to promote predation by the animalcules.

In the second biological treatment tank 102, not only the filtration predators of the filtration predators but also the agglomerate predators of predation type capable of predating the flocked sludge are propagated. In the latter case, when the flock is swallowed, the sludge is swept away and becomes sludge (sludge with poor sedimentation) scattered in the finely divided flock pieces. In addition, clogging of the membrane occurs by the flock pieces in the film-type activated sludge method, in particular, in which the membrane is separated at the rear end. Therefore, it is preferable to control the SRT constantly within a range of 60 days or less, preferably 45 days or less, in order to remove aggregated predator-type small animal. In the case of less than 15 days, it is unnecessarily excessively frequent, so that the number of flocculation-type animalcules as well as the aggregate-predator-type animalcules is excessively decreased.

In the first biological treatment tank 101, it is necessary to decompose most of the organic matter, that is, 70% or more, preferably 80% or more of the discharged BOD, into bacterial cells. In the first biological treatment tank 101, When the organic matter is completely decomposed, flocs are not formed in the second biological treatment tank 102, and nutrients for animal animal breeding are also insufficient, so that only sludge with low compaction (poor sedimentation sludge) Treatment group. Therefore, a part of the raw water is bypassed and supplied to the second biological treatment tank 102. When the sludge load due to the soluble BOD to the second biological treatment tank 102 is 0.025 kg-BOD / kg-MLSS / d or more . The MLSS at this time includes the MLSS of the carrier adherend.

For the treatment water taken out from the second biological treatment tank 102 through the strainer 123 and the piping 124, 125, in order to obtain a higher quality of the treated water quality, membrane separation, coagulation sedimentation, Which may be carried out. Further, when carrying out coagulation sedimentation or pressurization, the addition amount of the flocculant can be reduced. The sedimentation separation water from the second biological treatment tank 102 may be subjected to coagulation treatment in a coagulation tank and then to precipitation treatment in a solid-liquid separation tank (sedimentation tank) to separate the treated water and sedimentation sludge.

In the first and second biological treatment tanks 101 and 102, when foaming occurs due to aeration, it is preferable to sprinkle the defoaming agent aqueous solution from the sprinklers 116 and 126 to prevent foaming.

Fig. 11 shows an example of the embodiment of the present invention (II), and the present invention (II) is not limited to those shown below. For example, a third biological treatment tank may be formed at the rear end of the first biological treatment tank 101 and the second biological treatment tank 102 to form the biological treatment tank in three or more stages.

Also in the present invention (II), the first biological treatment tank 101 and the second biological treatment tank 102 can have various arrangement patterns, similarly to (a) - (h)

In this embodiment, since the tops 110 and 120 have the same shape and the same size, even when a large number of the tops 110 and 120 are installed, the tops 110 and 120 are provided close to each other to reduce the space between the tops, The installation space of the entire processing apparatus can be reduced. Also, the manufacturing cost of each of the mounts 110 and 120 becomes low. In the case where a plurality of the columns are installed in parallel, since the configurations of the columns are the same, the installation work of the column body and the piping connection work of the respective columns are the same, and the working efficiency is improved and the construction period can be shortened.

Each of the columns 110 and 120 has a diameter of 2.2 to 3.6 m and particularly 2.4 to 3.3 m and a height of 6 to 11 m and especially 8 to 11 m and a ratio H / D) of from 1.5 to 5.0, particularly preferably from 3.0 to 4.5. It is preferable that the height from the foundation 103 is 4 m or less, particularly 3.0 m or less, for the main piping connection portion, the manhole, the strainer 123, the air diffusers 112a, 112b, 122a and 122b. By forming the piping connection portion, the manhole, the strainer 123, the air diffusers 112a, 112b, 122a and 122b at low positions, the piping connection work, the device installation work, Efficiency and safety are improved.

In the present invention, an anaerobic treatment tank may be provided at the front end of the first biological treatment tank 101 to introduce treated water of the anaerobic treatment tank into the first biological treatment tank. The size of the column of the anaerobic treatment tank may be the same as that of each of the columns 110 and 120.

In the present invention, the adjustment tank may be provided at the foremost end of the anaerobic or aerobic treatment tank. The adjustment tank includes, for example, a raw water tank for leveling the raw water flow rate, a sedimentation accelerator for sedimenting solid matter, a pressurized floating apparatus, and the like.

In the present invention, it is preferable that each biological treatment tank is constructed so that an accessory device such as a diffuser or the like is previously mounted on a tower in the factory, transferred to the site, and installed on a foundation. Thereby, the number of field operations can be reduced, shortening the construction period and improving the assembly precision.

Next, a method of introducing the fluidized-bed carrier C at the start of operation of each biological treatment tank 101, 102 will be described.

When the carrier (C) is a sponge carrier or the like, even when it is injected into the columnar body (110 or 120), even when aeration is carried out simultaneously from each acid ore,

Therefore, in this embodiment, the carrier is aerated only in the air diffuser (112a or 122a) after the carrier is put into the mount (110 or 120). Since the air diffusers 112a and 122a are biased to one half side of the bottom of each of the tops 110 and 120 so that air bubbles from the air diffuser 112a or 122a, A rising flow is formed along the one half side in the columnar body 110 or 120 and a downward flow is formed in the other half side so that the columnar body 110 or 120 In the vertical direction. The carrier C charged into the column 110 or 120 is poured into the water by the descending flow and becomes compatible with water and flows in the columns 110 and 120.

Therefore, according to this starting method, even if all the carriers are fed into the respective beds 110 and 120, the carriers are rapidly dispersed in the water and start to flow.

In addition, water is sprayed from the water sprayer 116 at this start, and water is put on the carrier, so that the submergence of the carrier can be promoted. This water can be either won or awarded.

At this time, by spraying the defoaming agent aqueous solution from the sprayer 116, the air bubbles are coarsened and entangled with the carrier to prevent the carrier from floating.

Example

[Example 1]

A sponge carrier 704 kg having a size of 3 mm square and a bulk density of 0.04 g / cm 3 as a carrier was charged into a column 110 having the structure shown in Fig. 11 having an inner diameter of 2.5 m, a height of 10 m and a water surface height of 9 m, ) At a flow rate of 240 Nm ³ / h. As a result, all the carriers started to flow within 10 min. The area of the one half region where the diffuser 112a is disposed is 10% of the bottom area of the header 110. [

[Example 2]

In Example 1, water was further sprayed from sprinkler 116 at a rate of 100 L / min. As a result, all the carriers started to flow within 5 min.

[Comparative Example 1]

It performed 10 days it took until as in Example 1, diffuser (112a, 112b) from a result of the aeration amount to the total width 240 Nm ³ / h, all the carrier is to initiate flow.

[Comparative Example 2]

In Example 2, it took 7 days diffuser (112a, 112b) from a result of the aeration amount to the total width 240 Nm ³ / h, until all of the carrier is to initiate flow.

From the above Examples and Comparative Examples, it was recognized that according to the present invention, the start-up of the biological treatment apparatus can be remarkably early.

While the invention has been described in detail with reference to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

The present application is based on Japanese Patent Application No. 2014-050444 filed on March 13, 2014, and Japanese Patent Application No. 2015-027727 filed on February 16, 2015, all of which are incorporated herein by reference .

Claims (2)

An apparatus for biological treatment of organic wastewater,
And a height of 6 to 11 m.
Wherein an installation height of at least half of the piping connection portions is 3 m or less. The method according to claim 1,
Characterized in that the tower is erected on a foundation.

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