JPH09103794A - Waste water treatment without bulking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high-quality treated water without bulking activated sludge in the continuous or batchwise activated sludge process by stopping the treatment while leaving a specific amt. of BOD. SOLUTION: Most of the BOD(biochemical oxygen demand) related components easy to remove are removed by using a standard, completely-mixed, partition wall-provided, batchwise, air-diffused or mechanically-agitated activated sludge process device. In this case, to prevent bulking, i.e., to suppress the propagation of microorganisms in the filamentous form, the dissolved oxygen and nutrition are sufficiently balanced in an aeration tank, the excessive lowering of BOD in the supernatant which has been appropriately controlled in the aeration tank is avoided, and the treatment is stopped while leaving 60ppm BOD. Consequently, a high-quality treated water is obtained without bulking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The largest technical problem when treating organic industrial wastewater, municipal sewage, etc. by the activated sludge method is bulking. This phenomenon refers to a state in which the activated sludge swells and the sedimentation property deteriorates. The present invention is intended to suppress the occurrence of bulking and at the same time obtain highly treated water.

[0002]

BACKGROUND ART The causes of bulking of activated sludge are extremely diverse. To list the causes, the water quality of wastewater, especially its nutritional balance, lack of nitrogen or phosphorus, dissolved oxygen shortage, BOD overload, etc. are raised, but all of the causes are still elucidated. The current situation is that the analysis has not been carried out sufficiently.

However, its generation mechanism has been clarified. That is, due to abnormal growth of filamentous microorganisms in activated sludge. As a result, a large number of filaments project from the flocs of the activated sludge, and they come into contact with each other, and the numerous filaments form a layer, which supports the layer above it and prevents the sedimentation of the activated sludge. In other words, the particle concentration of the activated sludge is still low, and a state appears just after the start of sedimentation, just as in the consolidation period. Such activated sludge is expanded, and this is bulking.

When bulking occurs, activated sludge cannot be concentrated and separated by natural sedimentation in a settling tank, and flows out into a public water area together with treated water and pollutes it. On the other hand, as a result, the concentration in the sludge liquid returned from the settling tank to the aeration tank becomes insufficient, and as a result, the concentration of activated sludge in the aeration tank also becomes insufficient, resulting in a decrease in treatment efficiency and If it continues, it becomes impossible to continue processing.

[0005] In order to improve the bulking state, a treatment for removing various conditions that are considered to be the cause of the generation is taken with an actual device of activated sludge, but it is extremely difficult at present to completely remove complicated conditions. . Moreover, with a large-scale device, it takes a very long time to wait for improvement of the bulking state while continuing the wastewater treatment, and the bulking occurs again before the effect of the treatment is sufficiently confirmed. Often.

Several proposals have been made as treatments for bulking. One of them is a method in which a relatively large number of partition walls are provided in the aeration tank so that the flow of wastewater approaches from a perfect mixing type to a piston flow (Chudoba,
J. , Ottova, V .; , Madera, V .; ; Wa
ter Research 7 1,163 (197)
3)). It is interpreted that the concentration gradient in the aeration tank is effective in suppressing the occurrence of bulking. However, this kind of treatment does not mean that this problem has been resolved, and bulking has continued to occur frequently since then.

The above-mentioned treatment method is a method for locally providing a concentration gradient in the aeration tank, while a method for providing a concentration gradient with time has been proposed. This is the batch activated sludge method (Shiro Dazai, Norio Tare, Yoshimasa Takahara;
Sewage Society Magazine 191 (1982)). However, this method is limited to relatively small scale processing. In addition, the aeration tank becomes anaerobic during the inflow of new wastewater and while the activated sludge is settling and separating, so there is a high risk of abnormal growth of sulfur bacteria, etc. It is hard to say that it is a cure.

Another method of suppressing bulking is to install a selective tank. In order to suppress the growth of filamentous microorganisms, place a selective tank in front of the normal complete mixing type aeration tank, which is said to be prone to bulking, and bring activated sludge into contact with a relatively high concentration of wastewater. However, a method has been proposed in which a flocculating microorganism is selected here. In this method, filamentous growth may be suppressed in the selective tank, but in the subsequent aerobically-mixed aeration tank, the concentration of the substrate is low, and under such conditions, the filamentous The risk of abnormal growth of sex microorganisms is high.

[0009]

[Problems to be Solved by the Invention] The activated sludge method has a wide range of applications and is a method capable of efficiently removing pollutants. However, even though decades have passed since its practical application, the problem of bulking has been solved. It has not been. It is still frequently occurring in many treatment facilities, not only annoying environmental engineers, but also risking pollution of public water bodies.

[0010] Therefore, an object of the present invention is to provide a novel wastewater treatment method and apparatus, which has never existed, by which treated water with excellent water quality can be obtained without bulking activated sludge. If the method of the present invention is adopted, there is no fear of occurrence of bulking. as a result,
Environmental engineers will be able to devote themselves to improving the quality of treated water. It is the final object of the present invention to provide such a treatment method.

[0011]

Means for Solving the Problems In order to achieve the above object, the present inventor has conducted earnest research for many years on the bulking phenomenon of activated sludge. As a result, the following facts were found and the present invention was completed.

When bulking occurs, the actual equipment of the activated sludge method becomes inoperable, but when the sedimentation tank liquid is centrifuged and the supernatant liquid is collected and analyzed, BOD ( Biological Oxygen
Demand, biological oxygen demand) was found to be well removed. Furthermore, when the data is overlaid, in addition to the above, the BOD value is
The quality of the treated water was excellent, lower than before the occurrence of bulking.

Since filamentous microorganisms inhibit the sedimentation of activated sludge, it has been considered to be unnecessary and disturbing microorganisms for carrying out the activated sludge method. However, from the above facts found by the inventor, the filamentous microorganisms greatly hinder the natural sedimentation of the activated sludge, but surprisingly, the BOD removal performance is excellent and the filamentous microorganisms are present in the activated sludge, It will be a great contribution to the removal.

Therefore, the inventor continued his earnest research with the intention of separating and utilizing the two functions of the filamentous microorganism. As a result, specifically, Sphaerotilus na, which is a representative causative microorganism of bulking,
As a result of examining the culture characteristics of tans, it was surprisingly found that the morphology of microorganisms greatly changes depending on the medium concentration, in other words, the BOD concentration in wastewater. That is, the inventor natans is BO
We have found the surprising fact that it grows as single cells in wastewater containing D 300 ppm, but grows completely filamentous at BOD 60 ppm or less. Based on this interesting fact, the inventor continued his research.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor has completed the present invention, focusing on the above-mentioned performance and morphology of filamentous microorganisms. That is, in the first stage of wastewater treatment, most of the BOD, which is easy to remove, is removed by using a normal activated sludge method actual device.
For this purpose, any conventional device such as a standard type, a complete mixing type, a partition type, a batch type, an air diffusing type and a mechanical stirring type can be used.

However, in order to prevent bulking from occurring in the activated sludge method at this stage, that is, to suppress the growth of microorganisms in the form of filaments, the dissolved oxygen in the aeration tank, nutritional balance, etc. are sufficient, In addition, it controls the occurrence of bulking, which is characterized by preventing the BOD of the supernatant of the aeration tank liquid from dropping too much, performing insufficient treatment, and stopping the treatment before that, by properly managing it. Completed the activated sludge method.

The BOD value as the criterion is 100
Although it is −200 ppm, this measurement requires a long time, and therefore the sludge volume (sludge volume) is actually used.
e) and microscopic observation will be used for prompt judgment. If you manage the aeration tank in this way,
Filamentous microorganisms hardly grow in the activated sludge and its sedimentation is good. Therefore, this mixed solution can be transferred to a settling tank to easily separate the activated sludge.

The activated sludge separated here is returned to the aeration tank as return sludge liquid, and is used again as activated sludge for wastewater treatment. However, the supernatant still contains 10
Since it contains BOD value substances of 0-200ppm, it cannot be released into public water bodies as it is. Since the BOD substance remaining here is not removed by the activated sludge method of the first stage, it is generally a substance that is difficult to decompose and remove in many cases.

Therefore, the inventors of the present invention have found that the filamentous microorganisms that cause bulking are excellent in BOD removal performance as a second stage treatment method for the supernatant from the settling tank. Based on the facts found, the present invention was completed by using this. The main microorganisms that make up the activated sludge are cohesive, and normally form flocs. In comparison, the surface area of filamentous microorganisms is large and the chance of contact with its substrate, the BOD substance, is clearly greater. Therefore, it can be interpreted that the BOD substance that is difficult to remove can be efficiently removed.

However, filamentous microorganisms that can cause bulking cannot be separated by spontaneous sedimentation. Therefore, the inventor continued further research. Even if it is the second-stage treatment, the amount of water is the same as in the case of the first stage if it is not treated there, and the microorganisms used for the treatment have to be separated by natural sedimentation in reality. . Therefore,
The inventor continued his earnest research on a method for separating the filamentous microorganisms used for the treatment by spontaneous sedimentation. As a result, they invented a treatment method characterized by immobilizing filamentous microorganisms and removing BOD, which is relatively difficult to treat. This allows
The object of the present invention has been achieved.

As a method for immobilizing microorganisms, a comprehensive method,
A crosslinking method, an adsorption method, etc. are considered. However, in order to treat an extremely large amount of water, a large amount of microorganisms must be immobilized. In the encapsulation method and the crosslinking method, the base material used is expensive, and the processing cost for immobilization is high,
This is not realistic. As a result of repeated comparison studies and studies, the inventor has come to the conclusion that the adsorption method is suitable, considering the cost for water treatment and the required amount of immobilized cells.

As a result of further research, it has been clarified that there are several conditions as a substrate for adsorbing and immobilizing microorganisms that can be used in the present invention. That is, (1) Filamentous microorganisms can be adsorbed. This is the minimum requirement for the purposes of the present invention. However, even if it is adsorbed, it must be adsorbed in a state in which the function of the microorganism can be sufficiently exerted. (2) The immobilized substrate has an appropriate specific gravity. After adsorbing the microorganisms, the BOD removal performance cannot be sufficiently exerted unless they are suspended in a reaction vessel by riding a water stream. In addition, it is not necessary to suspend it, and it is necessary to settle and separate relatively quickly after standing. Therefore, having an appropriate specific gravity is an important condition. (3) No breakage or wear due to water flow. Once the water treatment is started, it will continue to operate semi-permanently, so this is also an important condition considering the treatment cost. (4) The surface area is large. Considering processing efficiency, it is important to immobilize as many microorganisms as possible,
Since the adsorption and immobilization of microorganisms depends on the surface area of the substrate,
This is also an important condition. (5) Being a natural product. Although the immobilized base material may sometimes flow out of the treated water of the second stage into the public water area due to a rare accident or the like, even in that case, it is desirable not to pollute the environment. For that purpose, the immobilization substrate is most preferably a relatively inexpensive natural product.

As a result of continuing the research for an adsorbing base material that meets these conditions, it was surprisingly found that wood chips are the most suitable. Therefore, we have completed a wastewater treatment method characterized by adsorbing wood chips as an adsorbent for microorganisms, suspending and adsorbing them in a reaction tank.

An ordinary aeration tank can be used as a device for flowing the wood chips on which the filamentous microorganisms are immobilized. If the wood strips are allowed to stand, they will quickly settle within a few minutes, so that they can be sufficiently separated only by providing a partition wall in the aeration tank where the treated water flows out. By treating the bottom of the site with a slope of 45 ° or more, the wood chips can be collected, and the processing device can be invented, which is characterized in that the wood chips are resuspended by blowing water or air.

The treated water discharged from the settling basin of the activated sludge method, which does not cause bulking, still contains a considerable amount of BOD and cannot be discharged to the public water area as it is. Therefore, the water quality standard for that purpose must be met. In order to do so, another step is needed. As a device therefor, it is possible to apply a device in which a woody piece on which filamentous microorganisms are immobilized is made to flow or which is used as a fixed layer.

In order to effectively treat a relatively dilute wastewater, a fixed layer prepared by stacking wood fragments on which filamentous microorganisms are immobilized in a suitable container such as a wire net or a plastic basket is suitable. Invented a featured wastewater treatment method by mounting it in a reaction vessel at intervals. Especially in this case, since it is the filamentous microorganisms that have been immobilized that require oxygen, it is not necessary to keep the dissolved oxygen in the entire reaction tank high, and it is necessary to install an aeration device at the bottom of the fixed layer. The characteristic wastewater treatment equipment works well. This is effective for use as an activated sludge system that does not cause bulking by connecting to the activated sludge method, but can also be applied to the treatment of dilute contaminated water such as rivers and lakes.

As a result of earnest research on a filamentous microorganism suitable for use in wastewater treatment after being adsorbed on wood chips, the present inventor has found that filamentous fungus isolated from a bulking activated sludge as the causative microorganism Either can be used. Specifically, the following microorganisms can be used. Sphaerotilus natans, S.
dichotomus, S. fruitans, Bac
illus megaterium, B.I. cereus,
B. cereus var. mycoides, B .; a
lvei, B.I. anthracis, B .; badiu
s, B.S. pumiles, B.I. thuringiens
is, B. stearothermophilus,
B. subtilus, B.I. coagulans, B.A.
licheniformis, Beggiatoa a
1ba, B.I. arachnoidea, B .; lepto
Mitiformis, B .; minima, B .; gig
antea, B.A. milabilis, Thiothr
ix sp. , Thiosphaera ersic
a, Sulphobacterium polymorph
a, Flavobacterium aquatil
e, F. arbrescens, F.R. solare,
F. akenokoites, F.I. marinovi
rosum, Pseudomonas calcis,
P. delphinii, P. maculicola,
P. martyniae, P.M. medicagini
S.P. phaseolicola, P. color
ae, P.A. pseudozooloeae, P. et al. cum
ini, P.I. panacis, Microthrix
parvicella, Haliscomenobac
ter hydrosis, Geotrichum c
andidum, and nocardiaforms.

[0028]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1 An example relating to the operation management method of the activated sludge method for preventing the occurrence of filamentous bulking is shown below. BO of concentrated wastewater discharged from a fermentation plant that uses molasses as the main raw material
D is about 15,000 ppm, which is concentrated and incinerated. Other than that, miscellaneous wastewater is discharged at the time of washing production equipment and fermentation products, and its BOD value is about 500 ppm. This miscellaneous wastewater is treated by the activated sludge method.

The miscellaneous wastewater is introduced into an aeration tank (400 m 3) of mechanical stirring type and completely mixing type, and MLSS of 300 is added.
0ppm, dissolved oxygen 2ppm, pH 7-8, urea was added to control the nutritional balance so that BOD: nitrogen = 100: 5, while keeping it in the aeration tank for 10 hours to continue the treatment. The BOD of the treated water is 53
ppm. When the treatment was continued for 28 days under these conditions, filamentous bulking occurred and the aeration tank liquid was removed by 30 times.
The sludge volume (SV) after standing for one minute was 98%. When the activated sludge was observed under a microscope, an extremely large number of filamentous microorganisms were found. In this case, a large amount of activated sludge flowed out from the sedimentation tank with a retention time of 3 hours, and the concentration of suspended solids (SS) in the treated water was 320 ppm.

Therefore, when the residence time was shortened to 6 hours and the operation was managed without changing all the operating conditions and the treatment was continued for 14 days, the SV was 78%. When the aeration tank liquid was observed under a microscope, filamentous microorganisms were observed, but the number thereof was clearly reduced. When such a treatment was taken, the SS of the treated water from the settling tank that stayed for 2 hours was 12 ppm, but the BOD was 126 pp.
m.

Example 2 Sphaer, which is a typical filamentous microorganism in activated sludge
An example of immobilization of Otilus natans is shown below. S. Although natans can be easily separated from activated sludge that has caused bulking, it is also possible to use microorganisms that have been separated and stored.

2 g of peptone, 1 g of yeast extract and 0.5 g of glucose were dissolved in 1 liter of tap water and the pH was adjusted.
Was adjusted to 7.0, 100 ml of this was placed in a 500 ml Erlenmeyer flask, sterilized at 120 ° C for 15 minutes, inoculated with the stored microorganisms, and cultured at 25 ° C for 3 days with shaking at 200 rpm. Propagate to. The growth can be known by measuring the transmitted light at 560 nm or by separating and measuring the amount of dry cells.

The wood chips are immersed in the above medium and the temperature is adjusted to 80 ° C.
After heating and sterilizing with, after sufficiently cooling, sprinkle the culture solution in the flask onto 2 kg of the mixture, mix well, form a mountain, and leave at room temperature (20-25 ° C.) for 72 hours to give S. ． natans-immobilized wood strips are obtained.

Separately, the wood strip 10k that has been immersed in the above medium
g is prepared and the above S. natans
Mix 500 g of immobilized wood chips well,
It is obtained by culturing for 8 hours.

Example 3 Filamentous sulfur bacteria, Be, often isolated from activated sludge
ggiatoa sp. An example is shown below for immobilization of. S. beggia instead of natans
toa sp. By using exactly the same conditions and operations as those shown in the second embodiment.
a sp. Can be obtained.

Example 4 A considerable amount of BO is still contained in the treated water discharged from the settling tank of the activated sludge method in which bulking does not occur as shown in Example 1.
Since D is included and cannot be released as it is to public water bodies, further treatment is required to meet the water quality standard for that. Examples of the treatment method are shown below.

From the first embodiment, the wood chips on which the filamentous microorganisms have been immobilized are suspended in a 100 m3 aeration tank in an amount equivalent to 2% by dry weight and allowed to flow. When the treated water that can be discharged is made to flow in and aeration is performed by air diffusion, it is allowed to stay for 2 hours.
Was 13 ppm and SS was not measured.

Since the filamentous microorganism-immobilized wood chips have an extremely excellent sedimentation property and completely sediment within a few minutes, a sedimentation pond connected to the aeration tank is not required for that purpose. However, solid-liquid separation is required, so a partition is provided at the location where the treated water in the aeration tank flows into the public water area. This alone is sufficient for separation. 4 at the bottom of that part
By keeping a gradient of 5 ° or more, the wood chips can be collected and can be suspended again in the aeration tank by blowing water or air.

Example 5 The filamentous microorganism-immobilized wood strip can be used as a fixed layer in addition to being used while flowing. The example is shown below.

The filamentous microbial-immobilized wooden strips are cage-shaped containers made of wire mesh (60 cm per strip) to the extent that this does not leak.
Cube), and make a device that can supply oxygen from the lower part, and make this one unit.
This unit was piled up in two steps in a concrete tank with a volume of 100 m3 (5.5 x 5.5 m, depth 3.5 m), and when 9 sets of this unit were installed, the residence time in that tank was 2 hours. When set and continuously operated, the BOD value of water in the tank was 21 ppm. In operating this device, the dissolved oxygen in the upper part of each unit was operated to be maintained at about 1 ppm.

[0041]

The method of the present invention or the device of the present invention,
Alternatively, by performing wastewater treatment by combining them, it is possible to carry out it without causing bulking, particularly filamentous bulking. Furthermore, the treated water discharged from the treatment has a water quality comparable to or superior to that obtained by conventional methods.

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[Procedure amendment]

[Submission date] May 14, 1996

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[0012] Bulking is generated, where although the real device of the active sludge process would fall into inoperable, that the settling tank was centrifuged, and the analysis was carried out by collecting the supernatant, BOD ( Biological Oxygen
Demand, biological oxygen demand) was found to be well removed. Furthermore, as a result of repeated data, even outside the intention, in any case, than before bulking occurs Rather rather low, the quality of the treated water was excellent.

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As a result of continuing the research for an adsorbing base material that meets these conditions, surprisingly, wood chips and porosity were obtained.
It has been found that light stone is the most suitable. Therefore,
Adsorb microorganisms on wood chips or porous light stones, and suspend or fluidize them in a reaction tank or use them as a fixed bed.
To complete the wastewater treatment method characterized the door.

[Procedure amendment 10]

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The bulking includes a BOD of still considerable amount in the treated water discharged from the settling tank of the activated sludge method is not Hey us, can not be directly discharged into public water, compatible with the water quality standard for the In order to do that, another step is needed. As a device therefor, it is possible to apply a device in which wood particles or porous light stones on which filamentous microorganisms are immobilized are made to flow, or which is used as a fixed layer.

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[0026] For effective treatment of relatively dilute wastewater, filamentous microbe-immobilized wood strips or porosity
The inventor has invented a wastewater treatment method characterized in that a fixed layer prepared by stacking light stones in a suitable container such as a wire net or a plastic basket is mounted in a reaction tank at appropriate intervals. Especially in this case, since it is the filamentous microorganisms that have been immobilized that require oxygen, it is not necessary to keep the dissolved oxygen in the entire reaction tank high, and it is necessary to install an aeration device at the bottom of the fixed layer. The characteristic wastewater treatment equipment works well. This is effective for use as an activated sludge system that does not cause bulking by connecting to the activated sludge method, but can also be applied to the treatment of dilute contaminated water such as rivers and lakes.

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The inventor has found that wood chips or porous light stones
As a result of diligent research on suitable filamentous microorganisms to be adsorbed on wood and used for wastewater treatment, any filamentous fungus isolated from the bulking activated sludge as the causative microorganism can be used. Specifically, the following microorganisms can be used. Sphaeroti
lus natans, S.L. dichotomus,
S. fluitans, Bacillus megat
erium, B .; cereus, B .; cereus v
ar. mycoides, B .; alvei, B .; ant
hracis, B .; badius, B .; pumile
s, B.S. thuringiensis, B .; star
thermophilus, B .; subtilus,
B. coagulans, B.A. licheniform
is, Beggiatoa alba, B.I. arach
noidea, B.I. leptomiformis,
B. minima, B .; gigantea, B .; mil
abilis, Thiothrix sp. , Thio
sphaera oresica, Sulphobac
ter polymorpha, Flavobacte
riumaquatile, F.R. arbrescen
s, F.S. solare, F.S. Okeanokoite
s, F.S. marinovirosum, Pseudom
onas calcis, P. delphinii,
P. maculicola, P .; martyniae,
P. medicaginis, p. phaseolic
ola, P .; colornae, P .; pseudozo
oloeae, P .; kumini, P .; panaci
s, Microthrix parvicella, H
aliscomenobacter hydrossi
s, Geotrichum candidum, and nocardiaforms.

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Example 2 Sphaer, which is a typical filamentous microorganism in activated sludge
An example of immobilization of Otilus natans is shown below. S. natans is it is easy to separate from the active sludge caused the bulking can also have use microorganisms have already separated stored.

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2 g of peptone, 1 g of yeast extract and 0.5 g of glucose were dissolved in 1 liter of tap water and the pH was adjusted.
Was adjusted to 7.0, 100 ml of this was placed in a 500 ml Erlenmeyer flask, sterilized at 120 ° C for 15 minutes, inoculated with the stored microorganisms, and cultured at 25 ° C for 3 days with shaking at 200 rpm. Propagate to. Their growth can either measure the transmitted light at 560 nm, can be known Ri by measuring the dry cell weight was separated.

[Procedure Amendment 15]

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Wood chips or porous light stones are immersed in the above medium, sterilized by heating at 80 ° C., sufficiently cooled, and 2 kg of the medium is sprinkled with the culture solution in the flask and mixed well, and then Oyama And place at room temperature (20-25 ° C) for 7
By allowing it to stand for 2 hours, S. natans-immobilized wood chips or porous light stones are obtained.

[Procedure Amendment 16]

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Separately, the wood strips soaked in the above medium or
10 kg of porous light stone material was prepared, and the above S. natans immobilized wood chips or porous light
500 g of stone materials are mixed well and similarly cultured at room temperature for 48 hours to obtain a microorganism immobilization body .

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Example 3 Filamentous sulfur bacteria, Be, often isolated from activated sludge
ggiatoa sp. S. natans together with
In exactly the same conditions as in Example 2, were immobilized on a porous light stone 100kg by carrying out the operation, this
This was packed in an iron column having a volume of 100 L. The bottom
The treated water of Example 1 while aerating 10 L / min of air from
(BOD 126ppm) is flowed in and staying in the tank
When the interval was set to 2 hours and continuous operation was performed, BOD13
ppm of treated water was obtained.

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[0037] 1 2% equivalent amount of wood strips are immobilized the filamentous microorganisms by dry weight, 100 m ³ suspended in volume aeration tank, by flow, treated water to discharge from Example 1 Was allowed to flow and was allowed to stay for 2 hours while performing aeration with aeration, and the BOD of the treated water was 13 ppm.
It was Tsu 11ppm der.

[Procedure amendment 19]

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The filamentous microorganisms immobilization wood strip is extremely precipitated is excellent, since becoming completely settled within a few minutes, precipitation Shingarichi for it was bought necessary. However, since solid-liquid separation is necessary, the treated water in the aeration tank will flow out into the public water area.
The partition wall is provided in a portion you. It was only able to sufficiently separated from this. By keeping a gradient of the bottom more than 45 ° of the site, it is possible to automatically collect wood strips, it can Rukoto suspended again aeration tank by blowing water or air It was

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

The filamentous microbial-immobilized wood strips are packed in a cage-like container made of wire mesh (60 cm per strip) to the extent that this does not leak.
Cube), and make a device that can supply oxygen from the lower part, and make this one unit.
In a concrete tank having a volume of 100 m ³ (5.5 × 5.5 m, depth 3.5 m), this unit was vertically stacked in two stages, and 9 sets of this unit were installed, and the treated water of Example 1 (BOD126p
pm) was flowed in and the residence time in the tank was set to 2 hours for continuous operation. The BOD value of the treated water was 21 pp.
m. In operating this device, the dissolved oxygen in the upper part of each unit was operated to be maintained at about 1 ppm.

Claims (10)

[Claims] 1. A continuous or batch type activated sludge method, which is characterized in that BOD is left at 100 ppm or more and the treatment is stopped. 2. A filamentous microorganism or a microorganism group containing the same is preliminarily fixed to a natural immobilizing agent and allowed to proliferate, or is fixed to the natural immobilizing agent in a reaction tank,
A method of decomposing and removing pollutants in water by growing them. 3. A method for treating wastewater, which comprises performing the treatment according to claim 1 after performing the treatment according to claim 1. 4. The processing method according to claim 2, wherein the filamentous microorganisms are fixed and grown on the wood chips. 5. The treatment method according to claim 2, wherein the wood chips on which the filamentous microorganisms have been adsorbed and proliferated are suspended in a reaction tank equipped with an oxygen supply device to treat the wastewater. 6. The method according to claim 2, wherein oxygen is supplied from the bottom of the container, which is a fixed layer formed by packing the wood chips on which the filamentous microorganisms have been adsorbed and grown. Equipment. 7. The method according to claim 2, wherein the water containing pollutants is introduced together with air from the bottom of a container filled with wood chips containing filamentous microorganisms. 8. The method according to claim 2, wherein oxygen is sufficiently supplied to the water containing pollutants, and then the water is allowed to flow into a container filled with wood chips containing filamentous microorganisms. Equipment for that. 9. A method for treating wastewater, which comprises fixing and using filamentous microorganisms separated from activated sludge. 10. A filamentous microorganism, Sphaeroti
lus natans, S.L. dichotomus,
S. fluitans, Bacillus megat
erium, B .; cereus, B .; alvei, B .;
cereus var. mycoides, B .; ant
hracis, B .; badius, B .; pumile
s, B.S. thuringiensis, B .; star
thermophilus, B .; subtilus,
B. coagulans, B.A. licheniform
is, Beggiatoa alba, B.I. arach
noidea, B.I. leptomiformis,
B. minima, B .; gigantea, B .; mil
abilis, Thiothrix sp. , Thio
sphaera oresica, Sulphobac
ter polymorpha, Flavobacte
rium aquatile, F.R. arbrescen
s, F.S. solare, F.S. Okeanokoite
s, F.S. marinovirosum, Pseudom
onas calcis, P. delphinii,
P. maculicola, P .; martyniae,
P. medicaginis, p. phaseolic
ola, P .; pseudozooloeae, P. et al. cu
mini, p. panacis, P .; colorna
e, Microthrix parvicella, H
aliscomenobacter hydrossis,
Geotrichum candidum, and n
A method for treating wastewater, which comprises fixing and propagating a microbial group containing a filamentous product of any of ocardiaforms or a combination thereof on a wood fragment.