JP2019069421A - Wastewater treatment device and wastewater treatment method - Google Patents

Abstract

To provide a wastewater treatment device and a wastewater treatment method capable of preventing the outflow of a carrier by suppressing the accumulation of biogas between the bottom of a treatment tank or the carrier.SOLUTION: A wastewater treatment device for treating organic wastewater with anaerobic microorganisms, comprises: a treatment tank 11 containing a carrier by which the anaerobic microorganism is carried; supply pipes 12, 13 and 14 for supplying the organic wastewater to the treatment tank 11; and an exhaust pipe that discharges a treated water from the treatment tank 11. At least one or more supply pipes 12, 13, 14 are provided in a direction along the wall surface of the processing tank 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wastewater treatment apparatus for treating organic wastewater with anaerobic microorganisms. The present invention also relates to a wastewater treatment method for treating organic wastewater with anaerobic microorganisms.

  Conventionally, drainage treatment using the UASB (Upflow Anaerobic Sludge Blanket) method or the EGSB (Expanded Granular Sludge Bed) method is known. In such wastewater treatment, it may be difficult to form granules or the formed granules may be disassembled depending on the conditions of the raw water and the operating conditions. In such a case, a carrier is added to the reaction vessel to maintain the methane bacteria in the treatment vessel to stabilize the treatment capacity.

Patent Document 1 is characterized in that a carrier is added to a reaction tank which is already operated in an anaerobic wastewater treatment method in which organic wastewater is flowed upward and the anaerobic treatment is performed with methane bacteria granules. A method of treating organic wastewater is disclosed. According to this treatment method, it is believed that the COD _Cr volume loading of the reaction vessel can be 5 to 50 kg / m ³ · d.

However, as a result of investigation by the present inventors, when COD _Cr volume load of the reaction tank is operated as ⁵ to 50 kg / m ³ · d, biogas generated in the process of treatment is accumulated between the bottom of the treatment tank or the carrier. It turned out that And when biogas continued to be generated, the carrier could not suppress the biogas, and it was found that the biogas spouted out, and the carrier was lifted by the momentum, and the carrier flowed out. Thus, when the carrier flows out from the treatment tank, there is a possibility that the anaerobic treatment becomes insufficient.

JP, 2014-100678, A

  The present invention has been made to solve the above problems, and an object thereof is to provide a waste water treatment apparatus and a waste water treatment method which can suppress the accumulation of biogas in the bottom of a treatment tank or between carriers. It is.

  The subject is a waste water treatment apparatus for treating organic waste water by an anaerobic microorganism, which comprises a treatment tank containing a carrier on which the anaerobic microorganism is carried, and a supply pipe for supplying the organic waste water to the treatment tank. And a discharge pipe for discharging treated water from the treatment tank, wherein at least one or more of the supply pipes are installed in a direction along the wall surface of the treatment tank. Resolved by

  At this time, in the jet nozzle of the front supply pipe, it is preferable that an angle formed by the supply pipe and the wall surface is 0 to 45 °. In the jet nozzle of the supply pipe, it is also preferable that an angle between the supply pipe and a horizontal surface be 0 to 60 °.

  Preferably, the supply pipe is installed below the processing tank, and the discharge pipe is installed above the processing tank. It is also preferable that the shape of the cross section of the treatment tank is circular, oval or square. It is also preferred that the carrier is a polyvinyl alcohol gel carrier.

  The subject is a waste water treatment method for treating organic waste water by an anaerobic microorganism, which comprises a treatment tank containing a carrier on which the anaerobic microorganism is carried, and a supply pipe for supplying the organic waste water to the treatment tank. And a discharge pipe for discharging treated water from the treatment tank, and the carrier is made to flow by ejecting the organic drainage from the supply pipe in the direction along the wall surface of the treatment tank. It is also solved by providing a treatment method.

  At this time, it is preferable that a plurality of the supply pipes be provided, and the organic drainage be ejected from the supply pipe to form a swirl flow in the treatment tank.

  According to the present invention, it is possible to suppress the accumulation of biogas at the bottom of a treatment tank or between carriers. As a result, outflow of the carrier can be prevented, and waste water treatment can be performed without reducing the treatment capacity.

It is a figure which shows the example of the processing flow in the processing apparatus of this invention. It is a perspective view of a cylindrical processing tank. It is the figure which looked at the processing tank shown in FIG. 2 from the top. It is the figure which looked at the processing tank shown in FIG. 2 from the side. It is a perspective view of a prismatic processing tank.

  The present invention relates to a waste water treatment apparatus for treating waste water with anaerobic microorganisms. The wastewater treatment apparatus of the present invention comprises a treatment tank containing a carrier on which an anaerobic microorganism is carried, a feed pipe for supplying organic wastewater to the treatment tank, and a discharge pipe for discharging treated water from the treatment tank. ing.

  The treatment apparatus of the present invention is an upflow anaerobic waste water treatment apparatus in which waste water is introduced below the treatment tank and treated water flows out from above. Since the treatment tank in the treatment apparatus of the present invention is a fluidized bed type, it is particularly suitably used to treat waste water using a carrier which tends to settle in the reaction tank or which tends to deposit in a consolidated state after settling. Anaerobic treatments include methane fermentation (anaerobic digestion), acid fermentation, denitrification, anaerobic ammonia oxidation, dephosphorization (anaerobic phosphorus release) and the like.

  FIG. 1 shows an example of the processing apparatus of the present invention. The apparatus shown in FIG. 1 includes an acid generation tank 2 and a water tank 4 for storing treated water 6 in addition to the treatment tank 1. The treatment tank 1 contains a carrier on which an anaerobic microorganism is supported. In the present invention, it is preferable to place the acid generation tank 2 at the front stage of the treatment tank 1. By installing the acid generation tank 2, it is possible to previously decompose organic compounds such as sugars, proteins and amino acids contained in the waste water 3 into volatile fatty acids which are intermediate products.

  The waste water to be treated by the treatment apparatus of the present invention only needs to contain at least an organic substance. Examples of such drainage include sewage from sewage, manure, process drainage generated with sewage treatment and processing of manure, factory drainage generated from food plants, pulp and paper mills, chemical plants etc., livestock waste such as livestock manure, livestock manure etc. The waste water etc. which are generated by processing of a thing are mentioned. In addition, since such drainage may contain solids such as sand and rubbish, it is possible to remove these solids, adjust the pH, and remove harmful substances such as heavy metals. Pretreatment may be applied. In the present specification, the liquid pretreated as described above before flowing into the treatment apparatus is also referred to as drainage. On the other hand, treated water refers to a solution in which waste water is introduced into a treatment apparatus and treated in some way in the acid generation tank 2 or the treatment tank 1 or the like.

  The waste water 3 is supplied to the acid generation tank 2 through the flow path and decomposed. The treated water 5 decomposed in the acid generation tank 2 is supplied to the treatment tank 1 through the flow path. The treated water 5 supplied to the treatment tank 1 is anaerobically treated by an anaerobic microorganism. The anaerobically treated treated water 6 is sent to the water tank 4 through the flow path and taken out as treated water 7. At this time, part of the treated water in the water tank 4 is returned to the acid generation tank 2 and the treatment tank 1 as return waters 8 and 9.

  The flow channel of the processing apparatus may be a single flow channel, may be a plurality of flow channels, or may be branched midway. At this time, by installing control means such as a switching valve such as a two-way valve or a three-way valve or an adjusting valve in the flow path, the flow rate of the treated water 5 supplied to the treatment tank 1 and the treated water discharged from the discharge pipe The flow rate can be adjusted. The carrier may be made to flow by controlling the flow rate to suppress the accumulation of biogas in the treatment tank 1.

  A supply pipe for supplying the treated water 5 to the treatment tank 1 is attached to a flow path through which the treated water 5 flows. The supply pipe may be attached to the end of the flow passage, or may be attached to the middle of the flow passage. The number of supply pipes is not particularly limited as long as it is one or more, but a plurality is preferable from the viewpoint of effectively suppressing the accumulation of biogas.

  The inner diameter of the supply pipe is preferably equal to or less than the inner diameter of the flow passage. The treated water 5 can be vigorously supplied to the treatment tank 1 by making the inner diameter of the supply pipe smaller than the inner diameter of the flow path. If the inner diameter of the feed pipe and the inner diameter of the flow path are the same, and it is apparently indistinguishable, the portion 10 cm from the tip is regarded as the feed pipe. The treatment water 5 can be vigorously supplied to the treatment tank 1 by using a convergent-type nozzle whose diameter decreases as the drainage progresses as the supply pipe.

  In the present invention, it is important that the supply pipe be installed in the direction along the wall surface of the processing tank 1. Here, the direction along the wall surface refers to a plane in contact with the curved surface at one point on the curved surface where the supply pipe is installed, when the wall surface is a curved surface, such as when the shape of the cross section of the processing tank 1 is circular or elliptical. It refers to the direction along the tangent plane. On the other hand, when the shape of the cross section is a square and the wall surface is a flat surface, the wall surface along the ejection direction of the supply pipe is called the wall surface of the processing tank 1.

  The position of the supply pipe in the processing tank 11 will be described by taking the processing tank 11 having a circular cross-sectional shape as an example. FIG. 2 is a perspective view of the processing tank 11. The cross-sectional shape of the processing tank 11 shown in FIG. 2 is circular, and three supply pipes 12, 13, 14 are installed in the processing tank 11. The direction of the arrow in FIG. 2 indicates the discharge direction of the drainage in the supply pipes 12, 13, 14. In the treatment apparatus of the present invention, it is preferable that an angle between the supply pipe and the wall surface be 0 to 45 ° at the jet nozzle of the supply pipe.

Here, the angle between the supply pipe and the wall surface will be described using FIG. FIG. 3 is a top view of the processing tank 11. The angle formed by the supply pipe and the wall surface is an angle formed by the supply pipe and a plane (contact plane) contacting the curved surface at one point on the curved surface where the supply pipe is installed. In FIG. 3, the angle α ₁₂ , the angle α ₁₃ and the angle α ₁₄ correspond to the angle. If the angle formed by the supply pipe and the wall surface exceeds 45 °, there is a possibility that the accumulation of biogas in the bottom of the processing tank 11 or the carrier can not be suppressed. The angle between the supply pipe and the wall surface is preferably 30 ° or less, more preferably 20 ° or less, and still more preferably 10 ° or less. In the case where a plurality of supply pipes are installed in the processing tank 11, it is preferable that they be installed at appropriate intervals in the circumferential direction of the processing tank 11, as shown in FIG.

FIG. 4 is a side view of the processing tank 11 shown in FIG. In the processing apparatus of the present invention, it is preferable that an angle between the supply pipe and the horizontal surface be 0 to 60 ° at the jet nozzle of the supply pipe. If the angle between the supply pipe and the horizontal surface exceeds 60 °, the carrier may flow out of the processing tank 11. More preferably, the angle between the supply pipe and the horizontal plane is 50 ° or less. In Figure 4, the angle beta ₁₂ is the angle corresponding to the angle formed between the supply pipe and the horizontal plane. When installing a plurality of supply pipes in the processing tank 11, it is preferable to install at equal intervals in the height direction of the processing tank 11.

  Next, the position of the supply pipe in the processing tank 15 will be described by taking the processing tank 15 having a rectangular cross-sectional shape as an example. FIG. 5 is a perspective view of the processing tank 15. In the processing tank 15 shown in FIG. 5, four supply pipes 16, 17, 18, 19 are installed. The direction of the arrow in FIG. 5 indicates the discharge direction of the drainage in the supply pipes 16, 17, 18, 19. Also in the processing tank 15 having a rectangular cross-sectional shape, it is preferable that an angle between the supply pipe and the wall surface be 0 ° to 45 ° at the jet port of the supply pipe. For the same reason as described above, the angle formed between the supply pipe and the wall surface is preferably 30 ° or less, more preferably 20 ° or less, and still more preferably 10 ° or less.

  Further, even in the processing tank 15 having a rectangular cross section, it is preferable that an angle between the supply pipe and the horizontal surface be 0 to 60 ° at the jet port of the supply pipe. For the same reason as described above, the angle between the supply pipe and the horizontal surface is more preferably 50 ° or less.

  As shown in FIG. 5, when installing a plurality of supply pipes in the processing tank 15, install the supply pipes at equal angular intervals around a vertical line passing through the center of gravity G of the square of the cross section. Is preferred. Also in the height direction of the processing tank 15, it is preferable to install the supply pipes at equal intervals.

  In the processing apparatus of the present invention, it is preferable that a supply pipe be installed below the processing tank 1 and a discharge pipe be installed above the processing tank 1. Here, the lower part of the processing tank 1 refers to the area from the bottom of the processing tank 1 to a half height, and the upper part of the processing tank 1 refers to the remaining area.

  The shape of the cross section of the processing tank 1 in the present invention is not limited to the above-mentioned circle or square. However, from the viewpoint of easy design of the processing tank 1, it is preferable that the shape is circular, oval or square.

  As described above, by providing the supply pipe in the direction along the wall surface of the processing tank 1, the accumulation of biogas in the bottom of the processing tank 1 or between the carriers can be suppressed. Therefore, in the processing apparatus of the present invention, a diffuser, a stirrer (for example, a propeller stirrer), and the like for suppressing the accumulation of biogas are not necessary.

  The carrier used in the treatment apparatus of the present invention is not particularly limited, but the carrier is preferably polyvinyl alcohol gel from the viewpoint of being less likely to clog the flow path, supply pipe, discharge pipe and the like of the treatment apparatus and having excellent contact efficiency with microorganisms. It is preferably a carrier. The polyvinyl alcohol gel carrier is highly hydrophilic because it has a large number of hydroxyl groups. Therefore, the affinity to a living body is also high, and a large number of microorganisms can be supported, whereby efficient processing can be performed.

  In addition, unlike a foam such as a sponge, the polyvinyl alcohol gel carrier can provide a suitable environment for the inhabiting of microorganisms without moisture being easily released even if an external force is applied and it is deformed.

  The equivalent sphere diameter of the carrier is preferably 1 to 10 mm. If the equivalent sphere diameter is less than 1 mm, there is a risk that the treatment tank 1 may flow out. The equivalent sphere diameter is more preferably 2 mm or more. On the other hand, if the equivalent sphere diameter exceeds 10 mm, there is a distance from the surface of the carrier to the inside, which may cause problems that bacteria can not live inside and metabolites are difficult to be discharged out of the carrier. When the carrier is used in a fluidized state, if the carrier has an excessively large sphere equivalent diameter, the flowability is lowered, so that the contact efficiency with the drainage may be lowered, and the efficiency of the drainage treatment may be lowered. From this point of view, the equivalent sphere diameter is more preferably 6 mm or less.

  The shape of the carrier is not limited, and may be any shape such as cube, rectangular parallelepiped, cylinder, sphere, macaroni and the like. A spherical shape is preferable in view of the flowability of the carrier and the contact efficiency with the drainage.

  The specific gravity of the carrier is preferably slightly higher than that of water, and is a specific gravity that can be oscillated in the reaction tank to such an extent that it does not run out of the reaction tank. Therefore, the specific gravity of the carrier is preferably 1.010 or more, more preferably 1.015 or more. On the other hand, the specific gravity is preferably 1.5 or less, more preferably 1.2 or less.

  Here, since the specific gravity of the polyvinyl alcohol gel carrier is greater than 1 and sinks in water and is flexible, it deposits in a compacted state, and biogas tends to stay between the carriers. However, in the processing apparatus of the present invention, the supply pipe is installed in the direction along the wall surface of the processing tank 1 and the waste water is ejected from the supply pipe to the processing tank 1 so that the carrier flows and biogas is accumulated. In addition, the outflow of the carrier due to the injection of biogas is eliminated, and the organic waste water can be treated efficiently.

  The polyvinyl alcohol gel carrier in the present invention is more preferably an acetalized polyvinyl alcohol gel carrier from the viewpoint of being able to increase the amount of microorganisms retained and ensuring durability in repeated use.

  The acetalized polyvinyl alcohol gel carrier can be obtained by an existing method, but an aqueous solution in which polyvinyl alcohol (PVA) and a water-soluble polymer polysaccharide are dissolved, in that the structure is suitable for holding microorganisms. A preferred method is forming the solution into a spherical shape by dropping it into an aqueous solution containing polyvalent metal ions, and then acetalizing treatment using an aldehyde. Among them, preferred is a polyvinyl alcohol gel carrier that is acetalized using a dialdehyde such as glutaraldehyde.

  In the present invention, the amount of the carrier introduced into the processing tank 1 is not particularly limited, but is preferably 10% by volume or more, more preferably 30% by volume or more based on the tank volume of the processing tank 1. On the other hand, it is preferable that it is 80 volume% or less with respect to the tank volume of the processing tank 1, and it is more preferable that it is 60 volume% or less.

  In addition, the present invention relates to a wastewater treatment method for treating organic wastewater with anaerobic microorganisms. The waste water treatment method of the present invention comprises a treatment tank containing a carrier carrying an anaerobic microorganism, a supply pipe for supplying organic waste water to the treatment tank, and a discharge pipe for discharging treated water from the treatment tank. The carrier is made to flow by spouting the organic drainage from the supply pipe in the direction along the wall surface of the treatment tank.

  At this time, from the viewpoint of further suppressing the accumulation of biogas causing the carrier to flow out, it is preferable to form a spiral flow in the treatment by providing a plurality of supply pipes and spouting the organic drainage from the supply pipes. .

  The waste water to be treated by the treatment method of the present invention may be any one containing at least an organic substance, and the above-mentioned waste water may be mentioned. As the carrier contained in the treatment tank, the above-mentioned polyvinyl alcohol gel carrier is suitably used. Further, the waste water treatment apparatus used in the treatment method of the present invention is not particularly limited, but the above-mentioned waste water treatment apparatus is suitably used.

  Hereinafter, the present invention will be described in detail by way of examples and comparative examples, but the present invention is not limited to these examples.

(Carrier for filling treatment tank)
The carrier charged into the treatment tank is a polyvinyl alcohol gel carrier acetalized with glutaraldehyde, and the equivalent sphere diameter is about 4 mm, and the specific gravity is 1.025.

Example 1
The anaerobic drainage process of the artificial drainage containing glucose was performed using the apparatus shown in FIG. The waste water 3 introduced into the acid generation tank 2 is decomposed into volatile fatty acids in the acid generation tank 2. The treated water 5 decomposed in the acid generation tank 2 is supplied to the treatment tank by three supply pipes through the flow path. The treatment tank 1 contains a carrier. The volume of each tank and the carrier loading amount in the processing tank 1 are as follows.

[Processing device]
(Acid generation tank 2)
Volume: 50 L (effective volume 25 L)

(Treatment tank 1)
The processing tank 11 used the processing tank 11 shown in FIG. The processing tank 11 shown in FIG. 2 has a bottom diameter of 0.15 m, a height of 3.4 m, a volume of 60 L, and an effective volume of 53 L (liquid level 3 m). The temperature in the tank is 37 ° C. Further, the inner diameters of the supply pipes 12, 13, 14 are all 20 mm.

  The angle between the supply pipe and the wall surface of the processing tank 11 is 0 ° in all of the three supply pipes, and the angle between the supply pipe and the horizontal surface is also 0 ° in all of the three supply pipes. The supply pipes 12 are disposed at the bottom of the processing tank 11, and the supply pipes 12 and 13 are disposed at intervals of 0.5 m in the height direction. Further, three supply pipes are installed at intervals of 90 ° in the circumferential direction of the processing tank 11.

(Water tank 4)
Water tank 4: 53 L

(Carrier loading amount)
Carrier filling amount in the processing tank 1: 50% by volume (relative to the tank volume)

[Processing condition]
(Initial condition)
Amount of granules (MLSS) initially charged to treatment tank 1: 3000 mg / L
Carrier COD _cr Load: 6 kg-COD _cr / Carrier-m ³ / day Wastewater COD _cr Concentration: 1000 mg / L
The above-mentioned COD _cr is a value obtained by measurement according to JIS K 0102.

(Start up of the reaction tank)
The valve (not shown) installed in the flow path of the apparatus is adjusted so that the flow rate of the treated water 5 supplied to the treatment tank 1 from the acid generation tank 2 becomes 4500 L / day, and the acid generation tank 2 is supplied. The flow rate of waste water was 159 L / day, and the flow rate of return water 9 returned from the water tank 4 to the acid generation tank 2 was 4341 L / day.

Then, while the flow rate of the treated water 5 supplied from the acid generation tank 2 to the treatment tank 1 is fixed at 4500 L / day, the flow rate of the waste water 3 supplied to the acid generation tank 2 is gradually increased and returned to the acid generation tank 2 The flow rate of return water 9 was gradually reduced. By doing this, the carrier COD _cr load of treatment tank 1 was increased to 100 kg-COD _cr / carrier-m ³ / day. The upward flow velocity in the processing tank 1 at this time was 25 m / h. In addition, a swirling flow was formed in the processing tank 1. Thereafter, as a result of waste water treatment under these conditions, the COD _cr removal rate remained at a good value of 90% or more, and there was no outflow of the carrier from the treatment tank 1.

Example 2
Waste water treatment was performed in the same manner as in Example 1 except that the angle formed by the supply pipe and the horizontal surface in each of the three supply pipes was 45 °. As a result, the COD _cr removal rate remained at a good value of 90% or more, and there was no outflow of the carrier from the treatment tank 11.

Example 3
Waste water treatment was performed in the same manner as in Example 1 except that the treatment tank 15 shown in FIG. 5 was used instead of the treatment tank 11 shown in FIG. The processing tank 15 is a processing tank having a bottom side of 0.13 m, a height of 3.4 m, a volume of 57 L, and an effective volume of 51 L (liquid level 3 m).

  As shown in FIG. 5, four supply pipes 16, 17, 18, 19 are attached to the processing tank 15. The angle between the supply pipe and the wall surface of the processing tank is 0 ° in all of the four supply pipes, and the angle between the supply pipe and the horizontal surface is also 0 ° in all of the three supply pipes. The supply pipes 16 are installed at the bottom of the processing tank 15, and the supply pipes 17, 18, 19 are installed at intervals of 0.5 m in the height direction. Further, the four supply pipes are installed at positions rotated by 90 ° around a vertical line passing through the center of gravity G of the square of the cross section of the processing tank 15.

As a result of the drainage treatment, a swirling flow was formed in the treatment tank 15. The COD _cr removal rate remained at a good value of 90% or more, and there was no outflow of the carrier from the treatment tank 15.

Comparative Example 1
In the processing tank 11 shown in FIG. 2, only one supply pipe 12 is installed at the bottom of the processing tank 11 so that the angle between the supply pipe 12 and the wall surface is 90 °, and the spout of the supply pipe 12 is It was directed to the center of the bottom of the processing tank 11. Then, the waste water treatment was performed in the same manner as in Example 1. As a result of the wastewater treatment, no swirling flow was formed in the treatment tank, and the biogas was not positively discharged. When the COD _cr carrier loading reached 80 kg / m ³ -carrier / day, the carrier flowed out with the outflow of the biogas, and the COD _cr removal rate became 20%.

Comparative example 2
Waste water treatment was performed in the same manner as in Example 1 except that the angle formed by the supply pipe and the horizontal surface in each of the three supply pipes was set to 70 °. As a result of the wastewater treatment, no swirling flow was formed in the treatment tank, and the biogas was not positively discharged. As a result, the carrier flowed out when COD _cr carrier loading reached 80 kg / m ³ -carrier / day, and the COD _cr removal rate became 20%.

1, 11, 15 treatment tank 12-14, 16-19 Supply pipe 2 acid generation tank 3 drainage 4 water tank 5, 6, 7 treated water 8, 9 return water

Claims (8)

A wastewater treatment system for treating organic wastewater with anaerobic microorganisms, comprising
A treatment tank containing a carrier on which the anaerobic microorganism is carried, a supply pipe for supplying the organic drainage to the treatment tank, and a discharge pipe for discharging treated water from the treatment tank,
At least one or more of the supply pipes are installed in a direction along the wall surface of the treatment tank.   The waste water treatment apparatus according to claim 1, wherein an angle formed by the supply pipe and the wall surface is 0 to 45 ° at a jet port of the supply pipe.   The waste water treatment apparatus according to claim 1 or 2, wherein an angle formed by the supply pipe and a horizontal surface is 0 to 60 ° at a jet port of the supply pipe.   The waste water treatment apparatus according to any one of claims 1 to 3, wherein the supply pipe is installed below the treatment tank, and the discharge pipe is installed above the treatment tank.   The waste water treatment apparatus according to any one of claims 1 to 4, wherein the shape of the cross section of the treatment tank is a circle, an ellipse or a square.   The waste water treatment apparatus according to any one of claims 1 to 5, wherein the carrier is a polyvinyl alcohol gel carrier. A wastewater treatment method for treating organic wastewater with anaerobic microorganisms, comprising
A treatment tank containing a carrier on which the anaerobic microorganism is carried, a supply pipe for supplying the organic drainage to the treatment tank, and a discharge pipe for discharging treated water from the treatment tank,
A method according to claim 1, wherein the carrier is made to flow by spouting the organic drainage from the supply pipe in the direction along the wall surface of the treatment tank.   The waste water treatment method according to claim 7, further comprising a plurality of the supply pipes, wherein the organic waste water is ejected from the supply pipe to form a swirl flow in the treatment tank.

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