JP2600885B2 - Wastewater treatment equipment using immobilized microorganisms - Google Patents
Wastewater treatment equipment using immobilized microorganismsInfo
- Publication number
- JP2600885B2 JP2600885B2 JP1037521A JP3752189A JP2600885B2 JP 2600885 B2 JP2600885 B2 JP 2600885B2 JP 1037521 A JP1037521 A JP 1037521A JP 3752189 A JP3752189 A JP 3752189A JP 2600885 B2 JP2600885 B2 JP 2600885B2
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- wastewater treatment
- immobilized
- immobilized microorganism
- microorganisms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Biological Treatment Of Waste Water (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、活性汚泥を固定化材に包括固定した固定化
微生物を用いて廃水を処理する装置に関する。Description: TECHNICAL FIELD The present invention relates to an apparatus for treating wastewater using immobilized microorganisms in which activated sludge is entrapped in an immobilizing material.
固定化微生物を用いる廃水の処理方法は、余剰汚泥の
発生量が少ないこと及び難分解性有機物の分解が可能で
ある等の利点を有するため、注目されている（角野ら
著、「固定化微生物による下水再利用技術」、日本工業
用協会第19回研究発表会要旨集、昭和59年３月発行）。The method of treating wastewater using immobilized microorganisms has attracted attention because it has advantages such as a small amount of generated excess sludge and the ability to decompose persistent organic matter (Kadono et al., “Immobilized microorganisms”). Sewage Recycling Technology ", Proceedings of the 19th Annual Meeting of the Japan Association for Industrial Use, March 1984).
この方法を実施する従来の装置は、固定化微生物ペレ
ットと廃水とを接触させる廃水曝気槽と浮遊汚泥を処理
水から分離する沈殿池とから成る。この装置を用いて廃
水処理を行う場合には、沈殿池に固定化微生物ペレット
が流出しないように曝気槽の出口に網等を備えておく方
法が採られている。A conventional apparatus for performing this method comprises a wastewater aeration tank for contacting immobilized microorganism pellets with wastewater and a sedimentation tank for separating suspended sludge from treated water. When performing wastewater treatment using this apparatus, a method is adopted in which a net or the like is provided at the outlet of the aeration tank so that the immobilized microorganism pellets do not flow out into the sedimentation basin.
しかしながら、前記の従来の方法では、網に活性汚泥
が付着し、目詰まりを起こし、運転が不能となったり、
さらに、沈殿池の活性汚泥を曝気槽へ返送する運転を行
うと、網に付着した活性汚泥が大量になり、スカムが生
じ、処理水が悪化してしまう。However, in the above-mentioned conventional method, activated sludge adheres to the net, causing clogging, making operation impossible,
Furthermore, when the operation of returning the activated sludge in the sedimentation basin to the aeration tank is performed, the amount of activated sludge attached to the net becomes large, scum is generated, and the treated water is deteriorated.
そこで、網を使用せず、固定化微生物ペレットを沈殿
池に流出させ、その固定化微生物ペレットを活性汚泥と
一緒に曝気槽を返送する方式が考えられる。しかしなが
ら、この方式では、固定化微生物ペレットと活性汚泥が
沈殿池で混在して沈殿しているため、余剰汚泥を引き抜
くと、固定化微生物ペレットも一緒に引き抜かれてしま
い、固定化微生物ペレットの損失を招く。Therefore, a method in which immobilized microorganism pellets are discharged to a sedimentation basin without using a net and the immobilized microorganism pellets are returned to the aeration tank together with the activated sludge is considered. However, in this method, the immobilized microorganism pellets and the activated sludge are mixed and settled in the sedimentation basin, so when the excess sludge is extracted, the immobilized microorganism pellets are also extracted together, and the loss of the immobilized microorganism pellets occurs. Invite.
したがって、本発明は、上記の従来技術の欠点を解消
し、余剰汚泥を引き抜くときに固定化微生物ペレットを
引き抜かず、活性汚泥のみを引き抜くことができる廃水
処理装置を提供することを目的とする。Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a wastewater treatment apparatus capable of extracting only activated sludge without extracting immobilized microorganism pellets when extracting excess sludge.
本発明は、沈殿池に撹拌装置を設け、活性汚泥の引き
抜き時に固定化微生物ペレットと活性汚泥の混在物を撹
拌し、撹拌停止後に沈降速度の差によって活性汚泥層と
固定化微生物ペレット層との２層を形成させ、活性汚泥
層から余剰汚泥を引き抜き、固定化微生物ペレットは曝
気槽へ返送しうるように構成することによって上記の課
題を解決したものである。The present invention provides a stirrer in the sedimentation basin, stirs the mixture of the immobilized microorganism pellets and the activated sludge during the extraction of the activated sludge, and, by stopping the agitation, the difference between the settling speed and the activated sludge layer and the immobilized microorganism pellet layer. This problem has been solved by forming two layers, extracting excess sludge from the activated sludge layer, and returning the immobilized microorganism pellets to the aeration tank.
すなわち、本発明による廃水処理装置は、固定化微生
物と浮遊汚泥とを浮遊させる曝気槽と沈殿池とから成る
廃水処理装置において、沈殿池に撹拌装置と活性汚泥引
き抜き装置を付設し、さらに沈殿池の下部から固定化微
生物を引き抜き、曝気槽へ返送する返送管を付設したこ
とを特徴とする。That is, the wastewater treatment apparatus according to the present invention is a wastewater treatment apparatus comprising an aeration tank for suspending immobilized microorganisms and suspended sludge and a sedimentation pond, wherein the sedimentation pond is provided with a stirring device and an activated sludge extraction device, And a return pipe for extracting the immobilized microorganisms from the lower part and returning the microorganisms to the aeration tank.
本発明に用いる固定化微生物において、微生物は細
菌、放線菌、カビ、酵母等、任意の微生物を純粋培養も
しくは混合培養したもの、活性汚泥又は土壌に付着した
微生物であってもよい。また、固定化材としては、ポリ
ウレタン、ポリビニルアルコール、ポリエチレングリコ
ール、ポリアクリルアミドあるいはその他の公知固定化
材を使用することができる。In the immobilized microorganism used in the present invention, the microorganism may be a microorganism, an actinomycete, a mold, a yeast, or any other microorganism, which is obtained by pure culture or mixed culture, activated sludge, or a microorganism adhered to soil. As the immobilizing material, polyurethane, polyvinyl alcohol, polyethylene glycol, polyacrylamide, or other known immobilizing materials can be used.
本発明に使用する固定化微生物は、前記のような各種
の微生物を常法で前記のような固定化材に包括固定する
ことによって製造される。固定化微生物は、円柱、立方
体、長方体、球形等の様々な形に成形されるが、球相当
径0.5〜10mm、比重1.01〜1.06の範囲の粒径のペレット
に成形されるのが好ましい。The immobilized microorganism used in the present invention is produced by entrapping and immobilizing the various microorganisms as described above in an immobilization material as described above in a conventional manner. The immobilized microorganism is formed into various shapes such as a column, a cube, a rectangle, and a sphere, but is preferably formed into a pellet having a sphere-equivalent diameter of 0.5 to 10 mm and a specific gravity of 1.01 to 1.06. .
本発明の廃水処理装置において、沈殿池に付設される
撹拌装置は、撹拌翼又は送気管であってよい。このよう
な撹拌装置によって活性汚泥と固定化微生物ペレットの
混在する沈降物を一旦、浮遊状態にする。その後、撹拌
を停止すると、固定化微生物ペレットは活性汚泥より沈
降速度が速いので、先に沈降し、活性汚泥層と固定化微
生物ペレット層の２層を形成する。これにより、活性汚
泥層から余剰汚泥として活性汚泥を引き抜き、固定化微
生物ペレットは曝気層へ循環して再使用に供することが
可能となる。In the wastewater treatment apparatus of the present invention, the stirring device attached to the sedimentation basin may be a stirring blade or an air supply pipe. With such a stirring device, the sediment in which the activated sludge and the immobilized microorganism pellets are mixed is temporarily suspended. Thereafter, when the stirring is stopped, the immobilized microorganism pellets settle earlier because the sedimentation speed is higher than that of the activated sludge, and form two layers of an activated sludge layer and an immobilized microorganism pellet layer. As a result, the activated sludge is withdrawn from the activated sludge layer as surplus sludge, and the immobilized microorganism pellets can be circulated to the aeration layer and reused.
〔実施例〕 次に、図面に示した本発明の廃水処理装置の実施態様
に基づいて、本発明をさらに詳しく説明する。[Example] Next, the present invention will be described in more detail based on an embodiment of the wastewater treatment apparatus of the present invention shown in the drawings.
第１図は、本発明の一実施態様である廃水処理装置を
曝気処理の運転状態で示す系統図である。第１図に示す
処理装置は、主として曝気槽１と沈殿池２から成る。曝
気槽２中には、原水供給管３から原水が流入し、固定化
微生物ペレット６と活性汚泥が浮遊し、送気管８から吹
き込まれる空気によって原水が曝気され、原水中の基質
が分解される。FIG. 1 is a system diagram showing a wastewater treatment apparatus according to an embodiment of the present invention in an operation state of aeration treatment. The processing apparatus shown in FIG. 1 mainly comprises an aeration tank 1 and a sedimentation tank 2. Raw water flows into the aeration tank 2 from the raw water supply pipe 3, the immobilized microorganism pellets 6 and the activated sludge float, and the raw water is aerated by the air blown from the air supply pipe 8 to decompose the substrate in the raw water. .
基質が分解され、浄化された処理水は、次に、固定化
微生物ペレット６及び活性汚泥と共に沈殿池２に導入さ
れ、処理水と固液分離され、処理水は処理水出口５から
流出する。固定化微生物ペレットは、比重1.01〜1.06で
あるので、活性汚泥より早く沈降するが、連続的に沈殿
池に流入するため、固定化微生物ペレットと活性汚泥は
混在した状態で堆積する。The treated water in which the substrate has been decomposed and purified is then introduced into the sedimentation basin 2 together with the immobilized microorganism pellets 6 and the activated sludge, separated into solid and liquid from the treated water, and the treated water flows out from the treated water outlet 5. Since the immobilized microorganism pellets have a specific gravity of 1.01 to 1.06, they settle earlier than the activated sludge, but continuously flow into the sedimentation basin, so that the immobilized microorganism pellets and the activated sludge are deposited in a mixed state.
そこで、次に、余剰汚泥を引き抜くときには、原水の
供給を停止し、撹拌翼７を回転させる。撹拌翼７を一定
時間回転させ、活性汚泥と固定化微生物ペレットを浮遊
状態にした後、回転を止め、沈降させる。撹拌翼を回転
させる時間及び沈降に要する時間は、沈殿池の容量、活
性汚泥と固定化微生物ペレットの量などによって変動す
るが、一般には、撹拌翼を２〜３分回転させ、回転を止
めた後、30分程度静置すればよい。Then, next, when pulling out excess sludge, the supply of raw water is stopped and the stirring blade 7 is rotated. After the stirring blade 7 is rotated for a certain period of time to bring the activated sludge and the immobilized microorganism pellets into a floating state, the rotation is stopped and sedimentation is performed. The time for rotating the stirring blades and the time required for sedimentation vary depending on the capacity of the sedimentation basin, the amount of activated sludge and the immobilized microorganism pellets, etc. In general, the stirring blades were rotated for 2 to 3 minutes, and the rotation was stopped. Then, it may be left still for about 30 minutes.
固定化微生物ペレットは、活性汚泥より沈降速度が早
いため、第２図に示すように固定化微生物ペレットは下
部に、活性汚泥は上部に堆積する。したがって、下部に
堆積した固定化微生物ペレットを返送管４によって曝気
槽１へ返送し、上部の活性汚泥層11から活性汚泥を余剰
汚泥引き抜き管９によって引き抜くことができる。Since the immobilized microorganism pellet has a higher sedimentation rate than the activated sludge, the immobilized microorganism pellet is deposited on the lower part and the activated sludge is deposited on the upper part as shown in FIG. Therefore, the immobilized microorganism pellets deposited in the lower part can be returned to the aeration tank 1 by the return pipe 4, and the activated sludge can be pulled out from the upper activated sludge layer 11 by the surplus sludge pulling-out pipe 9.
さらに、本発明の別の実施態様として、第３図に示す
ように送気管10を撹拌装置に用いることもできる。Further, as another embodiment of the present invention, as shown in FIG. 3, the air supply pipe 10 can be used for a stirring device.
本発明の廃水処理装置によれば、沈殿池において固定
化微生物と活性汚泥とを分離することができ、活性汚泥
だけを余剰汚泥として容易に引き抜くことができ、固定
化微生物ペレットは曝気槽に返送して循環使用すること
ができる。According to the wastewater treatment apparatus of the present invention, immobilized microorganisms and activated sludge can be separated in the sedimentation basin, only activated sludge can be easily extracted as surplus sludge, and the immobilized microorganism pellets are returned to the aeration tank. It can be used for circulation.
第１図は本発明の一実施態様である廃水処理装置の系統
図、第２図は第１図の装置の沈殿池を、撹拌停止後に２
層を形成した状態で示す系統図、第３図は本発明の別の
実施態様である廃水処理装置の沈殿池部分の系統図であ
る。 符号の説明 １……曝気槽、２……沈殿池、３……原水供給管、４…
…返送管、５……処理水出口、６……固定化微生物ペレ
ット、７……撹拌翼、９……余剰汚泥引き抜き管、８及
び10……送気管FIG. 1 is a system diagram of a wastewater treatment apparatus according to one embodiment of the present invention, and FIG.
FIG. 3 is a system diagram showing a sedimentation pond portion of a wastewater treatment apparatus according to another embodiment of the present invention, in which a layer is formed. DESCRIPTION OF SYMBOLS 1 ... aeration tank, 2 ... sedimentation basin, 3 ... raw water supply pipe, 4 ...
... return pipe, 5 ... treated water outlet, 6 ... fixed microorganism pellets, 7 ... stirring blades, 9 ... excess sludge withdrawal pipe, 8 and 10 ... air supply pipe
Claims (2)
気槽と沈殿池とから成る廃水処理装置において、沈殿池
に撹拌装置と活性汚泥引き抜き装置を付設し、さらに沈
殿池の下部から固定化微生物を引き抜き、曝気槽へ返送
する返送管を付設したことを特徴とする固定化微生物を
用いる廃水処理装置。1. A wastewater treatment apparatus comprising an aeration tank for suspending immobilized microorganisms and suspended sludge and a sedimentation pond, wherein the sedimentation pond is provided with a stirring device and an activated sludge extraction device, and further immobilized from the lower part of the sedimentation pond. A wastewater treatment device using immobilized microorganisms, comprising a return pipe for extracting microorganisms and returning the microorganisms to an aeration tank.
１記載の廃水処理装置。2. The wastewater treatment apparatus according to claim 1, wherein the stirring device is a stirring blade or an air supply pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1037521A JP2600885B2 (en) | 1989-02-17 | 1989-02-17 | Wastewater treatment equipment using immobilized microorganisms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1037521A JP2600885B2 (en) | 1989-02-17 | 1989-02-17 | Wastewater treatment equipment using immobilized microorganisms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02218496A JPH02218496A (en) | 1990-08-31 |
| JP2600885B2 true JP2600885B2 (en) | 1997-04-16 |
Family
ID=12499851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1037521A Expired - Fee Related JP2600885B2 (en) | 1989-02-17 | 1989-02-17 | Wastewater treatment equipment using immobilized microorganisms |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600885B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105829252B (en) * | 2013-10-22 | 2019-04-02 | 那沃达有限责任公司 | The substance in contaminated fluid is reduced using naturally-produced biological growth medium |
-
1989
- 1989-02-17 JP JP1037521A patent/JP2600885B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02218496A (en) | 1990-08-31 |
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