JP3154904B2 - How to rebuild sewage treatment facilities - Google Patents

How to rebuild sewage treatment facilities

Info

Publication number
JP3154904B2
JP3154904B2 JP30296494A JP30296494A JP3154904B2 JP 3154904 B2 JP3154904 B2 JP 3154904B2 JP 30296494 A JP30296494 A JP 30296494A JP 30296494 A JP30296494 A JP 30296494A JP 3154904 B2 JP3154904 B2 JP 3154904B2
Authority
JP
Japan
Prior art keywords
aeration tank
sewage treatment
sedimentation basin
sewage
facility
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
Application number
JP30296494A
Other languages
Japanese (ja)
Other versions
JPH08132087A (en
Inventor
秀雄 豊泉
登 菱沼
信行 門倉
静郎 佐々木
大次郎 田辺
良平 石田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kumagai Gumi Co Ltd
Original Assignee
Kumagai Gumi Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kumagai Gumi Co Ltd filed Critical Kumagai Gumi Co Ltd
Priority to JP30296494A priority Critical patent/JP3154904B2/en
Publication of JPH08132087A publication Critical patent/JPH08132087A/en
Application granted granted Critical
Publication of JP3154904B2 publication Critical patent/JP3154904B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Landscapes

  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Activated Sludge Processes (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、主として最初沈澱池、
曝気槽および最終沈澱池からなる活性汚泥法による下水
処理施設の改築方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for renovating a sewage treatment facility by an activated sludge method comprising an aeration tank and a final settling pond.

【0002】[0002]

【従来技術とその問題点】下水道事業に早期に着手した
都市においては、供用開始して50年以上経過した処理
施設が増加しており、これらの処理場では機械電気設備
だけでなく土木建築施設においても老朽化が著しく、維
持管理費の増大を招いている。また、経過年数50年以
下の下水処理場でも、高度処理の必要性により、あるい
は腐食等の原因により、改築の要請が増加しつつある。
一般に、老朽化した下水道施設を改築するに当たって重
要なことは、下水道施設としての機能を損なうことなく
改築工事を進めなければならないことである。改築期間
中、その代替施設が問題となるが、とりわけ下水処理施
設における代替施設が大きな問題となっている。
2. Description of the Related Art In cities where sewerage services have begun early, the number of treatment facilities that have been in service for more than 50 years has increased, and these treatment facilities have not only mechanical and electrical equipment but also civil engineering and construction facilities. Are also very old, causing an increase in maintenance costs. In addition, even in a sewage treatment plant with an age of 50 years or less, the demand for remodeling is increasing due to the need for advanced treatment or due to corrosion or the like.
Generally, when renovating an aging sewerage facility, it is important that the renovation work be carried out without impairing the function of the sewerage facility. During the renovation period, the replacement facilities are a problem, especially the replacement facilities in the sewage treatment facilities.

【0003】現在、下水処理場における水処理方式は活
性汚泥法が主流となっている。図5は活性汚泥法による
下水処理場の主要な部分の概略断面図であり、最初沈澱
池P、曝気槽ATおよび最終沈澱池Fからなる処理系が
示されている。図5において、図示してないポンプ場か
ら分配槽を経て最初沈澱池Pに導入された被処理水は、
ここで比較的沈澱し易い固形物と上澄水とに分離され、
同時にごみや油等の水面に浮上したスカムも分離され
る。沈澱した固形物は汚泥として池底からポンプで引き
抜き、汚泥処理施設へ送られる。最初沈澱池Pにおける
被処理水の滞留時間は約2時間程度である。
At present, the activated sludge method is mainly used as a water treatment method in a sewage treatment plant. FIG. 5 is a schematic sectional view of a main part of a sewage treatment plant by the activated sludge method, and shows a treatment system including a first settling tank P, an aeration tank AT, and a final settling tank F. In FIG. 5, the water to be treated first introduced into the sedimentation basin P from the pump station (not shown) via the distribution tank is:
Here, it is separated into a solid that relatively easily precipitates and supernatant water,
At the same time, scum floating on the water surface such as garbage and oil is also separated. The precipitated solid is pumped out of the pond bottom as sludge and sent to a sludge treatment facility. The residence time of the water to be treated in the first settling basin P is about 2 hours.

【0004】曝気槽AT(エアレーションタンク)と呼
ばれる水槽内には空気が送り込まれ、好気性の微生物の
働きを利用して下水中の汚濁成分を吸着、分解する。曝
気槽ATにおける被処理水の滞留時間は6〜8時間であ
る。最終沈澱池Fでは、曝気槽ATから流出してきた微
生物を含む混合液を2時間程度かけて沈澱させ、上澄水
を消毒し処理水として河川等に放流する。最終沈澱池F
で沈澱した汚泥には多くの微生物が含まれており、その
一部は微生物群として曝気槽ATに返送され、残汚泥は
余剰汚泥として汚泥処理施設へ送られる。
[0004] Air is fed into a water tank called an aeration tank AT (aeration tank), and adsorbs and decomposes pollutants in sewage using the action of aerobic microorganisms. The residence time of the water to be treated in the aeration tank AT is 6 to 8 hours. In the final sedimentation basin F, the mixed solution containing the microorganisms flowing out of the aeration tank AT is sedimented for about two hours, and the supernatant water is disinfected and discharged into a river or the like as treated water. Final sedimentation basin F
The sludge precipitated in the above contains many microorganisms, some of which are returned to the aeration tank AT as a group of microorganisms, and residual sludge is sent to a sludge treatment facility as surplus sludge.

【0005】上記した下水処理場における水処理は、通
常、複数の系列で運転されており、従って、これらの水
処理施設の容量に余裕がある場合には、1系列分の処理
すべき下水を他の系列に振り分けて、1系列ずつ逐次改
築を行うことができる。また、下水処理場の用地に余裕
がある場合には、その場所に代替施設を設置して施設の
改築を行うことができる。例えば、用地に関しては1系
列分の余裕がなくとも最初沈澱池を1基仮設できる程度
のスペースがあれば、地上または地下に重層式の処理施
設を1系列構築することにより、既存の処理系列を解体
し、改築することは不可能ではない。しかしながら、当
該改築方法は工事費用が極端に嵩むと共に、ポンプ圧送
等の維持管理費も高騰するという問題点を有している。
[0005] Water treatment in the above-mentioned sewage treatment plants is usually operated in a plurality of systems. Therefore, if there is room in the capacity of these water treatment facilities, the sewage to be treated for one system is treated. Remodeling can be carried out one by one by allocating to other groups. In addition, if there is room in the site of the sewage treatment plant, an alternative facility can be installed at that site and the facility can be renovated. For example, if there is enough space for one settling pond at the beginning even if there is no room for one series, the existing processing series can be constructed by constructing one multi-layered processing facility above or below the ground. It is not impossible to dismantle and rebuild. However, the rebuilding method has a problem that the construction cost is extremely high and the maintenance and management cost such as pumping is also increased.

【0006】従って、特に、容量および用地の双方に余
裕がない場合には、前記した方法を採用することはでき
ず、解決策が待たれている。
Therefore, especially when there is no room for both capacity and land, the above-mentioned method cannot be adopted, and a solution is awaited.

【0007】[0007]

【発明の目的】この発明は、最初沈澱池、曝気槽および
最終沈澱池からなる処理系を複数列備えた下水処理施設
において、特に、代替施設用の空地がなく、下水の処理
能力にも余裕がない場合の合理的な改築方法を提供する
ことを目的とするものである。
SUMMARY OF THE INVENTION The present invention relates to a sewage treatment facility having a plurality of treatment systems consisting of a first settling basin, an aeration tank and a final settling basin. The purpose is to provide a reasonable renovation method when there is no.

【0008】[0008]

【構成】本発明は、曝気槽に供給する空気を高濃度の酸
素に代え、下水を最初沈澱池を経由せずに直接曝気槽に
導入して下水処理を行いつつ、最初沈澱池位置に改築施
設を構築し、次いで、この改築施設で下水処理を行いつ
つ、下水処理に供しない施設を順次改築していくことを
特徴とするものである。
[Constitution] In the present invention, the air supplied to the aeration tank is replaced with high-concentration oxygen, and the sewage is directly introduced into the aeration tank without first passing through the sedimentation basin, and the sewage treatment is carried out. It is characterized by constructing a facility, and then successively renovating facilities not used for sewage treatment while performing sewage treatment at the renovated facility.

【0009】また、本発明は、改築すべき曝気槽以外の
曝気槽の処理能力を高め、当該曝気槽で処理した下水を
最終沈澱池に振り分けて下水処理を行いつつ、1系列の
最初沈澱池と曝気槽を改築し、次いで、改築済の施設で
下水処理を行いつつ、下水処理に供しない施設を順次改
築していくことを特徴とするものである。前記曝気槽の
処理能力を高める方法としては、曝気槽中に固定化微生
物を導入する方法、または、曝気槽中に高濃度の酸素を
導入する方法が望ましい。
[0009] Further, the present invention enhances the treatment capacity of aeration tanks other than the aeration tank to be reconstructed, and distributes the sewage treated in the aeration tank to the final sedimentation basin to perform sewage treatment, while the first settling basin in one series is being treated. Then, the aeration tank was rebuilt, and then the sewage treatment was performed at the renovated facilities, while facilities not used for sewage treatment were gradually rebuilt. As a method of increasing the treatment capacity of the aeration tank, a method of introducing immobilized microorganisms into the aeration tank or a method of introducing high-concentration oxygen into the aeration tank is desirable.

【0010】更に、本発明は、改築すべき曝気槽以外の
曝気槽に供給する空気を高濃度の酸素に代え、下水を最
初沈澱池を経由せずに直接当該曝気槽に導入した後、最
終沈澱池と最初沈澱池とに分流して下水処理を行いつ
つ、1系列の最初沈澱池、曝気槽および最終沈澱池を改
築し、次いで、改築済の施設で下水処理を行いつつ、下
水処理に供しない施設を順次改築していくことを特徴と
するものである。
[0010] Further, the present invention provides a method wherein the air supplied to the aeration tank other than the aeration tank to be reconstructed is replaced with high-concentration oxygen, and the sewage is introduced directly into the aeration tank without first passing through the sedimentation tank. The sedimentation basin and the first sedimentation basin are separated for sewage treatment while sewage treatment is performed while a series of first sedimentation basin, aeration tank and final sedimentation basin are reconstructed. The feature is that the facilities that will not be provided will be gradually rebuilt.

【0011】また、本発明は、改築すべき曝気槽以外の
曝気槽に供給する空気を高濃度の酸素に代え、下水を最
初沈澱池を経由せずに直接当該曝気槽に導入した後、最
終沈澱池、最初沈澱池の順に流して下水処理を行いつ
つ、1系列の最初沈澱池、曝気槽および最終沈澱池を改
築し、次いで、改築済の施設で下水処理を行いつつ、下
水処理に供しない施設を順次改築していくことを特徴と
するものである。
[0011] The present invention also relates to a method for replacing air supplied to an aeration tank other than an aeration tank to be reconstructed with high-concentration oxygen and introducing sewage directly into the aeration tank without first passing through a sedimentation tank. The sedimentation basin, the first sedimentation basin are flowed in order, and the sewage treatment is carried out while the first settling basin, the aeration tank and the final sedimentation basin are reconstructed. It is characterized by rebuilding facilities that do not work sequentially.

【0012】[0012]

【作用】曝気槽中に高濃度の酸素を導入したり、また
は、固定化微生物を導入することによって曝気槽の処理
能力を促進する。また、曝気槽から排出される被処理水
の流出経路を工夫することにより最終沈澱池における沈
澱分離能力を増強する。而して、施設の現状処理能力を
確保しながら、老朽化した施設を順次改築する。老朽化
した施設を改築したら、前記代替処理施設は解体し撤去
する。あるいは、当該処理施設を恒久施設とすることに
より下水処理場の処理能力の増強を図ってもよい。
The treatment capacity of the aeration tank is promoted by introducing a high concentration of oxygen into the aeration tank or by introducing immobilized microorganisms. In addition, the separation and separation capacity of the final sedimentation basin is enhanced by devising the outflow route of the water to be treated discharged from the aeration tank. The aging facilities will be gradually rebuilt while securing the current processing capacity of the facilities. When the aging facility is reconstructed, the alternative treatment facility is dismantled and removed. Alternatively, the treatment capacity of the sewage treatment plant may be enhanced by making the treatment facility a permanent facility.

【0013】[0013]

【実施例】図6は、標準活性汚泥法による下水処理施設
の代表的な配置図を示しており、最初沈澱池P、曝気槽
ATおよび最終沈澱池Fからなる処理系が並列的に複数
列設置されている。以下、この3系列の下水処理施設を
改築する場合を例にとって、本発明の下水処理施設の改
築方法を説明する。
FIG. 6 shows a typical layout of a sewage treatment plant using the standard activated sludge method. A treatment system consisting of a first settling tank P, an aeration tank AT and a final settling tank F is arranged in a plurality of rows in parallel. is set up. Hereinafter, the method of renovating the sewage treatment facility of the present invention will be described, taking as an example the case of renovating the three series of sewage treatment facilities.

【0014】図1は、本発明による改築方法の好適な実
施例を示す平面配置図であり、この実施例では、改築工
事の期間中、酸素式活性汚泥法を利用するものである。
図7は、酸素式活性汚泥法のフローシートであり、同法
は、前記した標準活性汚泥法の空気の代わりに90%〜
95%という高濃度の酸素を用いるものであり、次のよ
うな特徴を有している。
FIG. 1 is a plan view showing a preferred embodiment of a rebuilding method according to the present invention. In this embodiment, an oxygen activated sludge method is used during a rebuilding operation.
FIG. 7 is a flow sheet of the oxygen activated sludge method, which is 90% to 90% instead of the air of the standard activated sludge method described above.
It uses oxygen at a high concentration of 95% and has the following features.

【0015】(1)標準活性汚泥法の1/2程度のエア
レーション時間で、被処理水のBOD、SS、COD及
び透視度とも、標準活性汚泥法と同程度のものが得られ
る。 (2)MLSS(曝気槽内の好気性微生物の量)を、標
準活性汚泥法の2倍以上に維持することができ、BOD
容積負荷を1.0〜2.0kg/m3 ・日、BOD−S
S負荷を0.3〜0.6kg/SSkg・日で運転する
ことができる。これは、曝気槽の体積を標準活性汚泥法
より小型化できることを意味しており、同一のBOD除
去であれば、1/3程度とすることができる。
(1) With the aeration time of about 1/2 that of the standard activated sludge method, the same BOD, SS, COD and transparency of the water to be treated can be obtained as those of the standard activated sludge method. (2) MLSS (the amount of aerobic microorganisms in the aeration tank) can be maintained at least twice that of the standard activated sludge method, and BOD
BOD-S with a volumetric load of 1.0 to 2.0 kg / m 3 · day
It can be operated at an S load of 0.3 to 0.6 kg / SS kg / day. This means that the volume of the aeration tank can be made smaller than that of the standard activated sludge method, and can be reduced to about 1/3 if the same BOD is removed.

【0016】(3)水質条件等にもよるが、例えば、小
規模下水処理場向け等の場合には、最初沈澱池を省略す
ることもできる。 (4)汚泥の沈降性が良好であるため、最終沈澱池の運
転が容易である。また、余剰汚泥の発生量は標準活性汚
泥法に比べて一般に少ない。 (5)曝気槽を密閉式とすれば、泡や飛沫によって周辺
の環境を損なうことがなく、また、排ガス量も少なく、
臭気ガスの殆どが酸化分解されるため、臭気による2次
公害を防止できる。
(3) Although it depends on water quality conditions, for example, in the case of a small-scale sewage treatment plant or the like, the sedimentation basin can be omitted first. (4) Since the sedimentation of sludge is good, the operation of the final sedimentation basin is easy. In addition, the amount of excess sludge generated is generally smaller than that of the standard activated sludge method. (5) If the aeration tank is of a closed type, the surrounding environment will not be impaired by bubbles and droplets, and the amount of exhaust gas will be small.
Since most of the odor gas is oxidized and decomposed, secondary pollution due to odor can be prevented.

【0017】そこで先ず、図1(a)に示すように、既
存の3系列の曝気槽ATを酸素式曝気槽OATに変更す
る。そのためには、酸素発生装置OG及び撹拌機Mが必
要となるが、曝気槽ATの構造体や曝気用配管は既存の
ものがそのまま使用可能であるから、経済的である。な
お、供給した酸素の有効利用を図るためにタンクを密閉
式とする場合には、酸素式曝気槽OATの頂部を覆蓋
し、タンクに複数の仕切りを設けるとともに、排ガスの
引き抜き装置を設置する。酸素式活性汚泥法への変更に
より、最初沈澱池Pを使用する必要がなくなるので、下
水を最初沈澱池Pを経由せずに、直接曝気槽OATに導
入して下水処理を行う。
First, as shown in FIG. 1A, the existing three series of aeration tanks AT are changed to oxygen type aeration tanks OAT. For that purpose, the oxygen generator OG and the stirrer M are required, but the structure of the aeration tank AT and the aeration pipe can be used as they are, which is economical. When the tank is closed in order to effectively use the supplied oxygen, the top of the oxygen-type aeration tank OAT is covered, a plurality of partitions are provided in the tank, and an exhaust gas extraction device is installed. By changing to the oxygen activated sludge method, it is not necessary to use the sedimentation basin P at first, so the sewage is introduced directly into the aeration tank OAT without passing through the sedimentation basin P first.

【0018】最初沈澱池Pが設けられていた場所、即
ち、図1(a)において、一点鎖線で囲まれた部分は空
きスペースとなるので、ここに下水処理施設を1系列構
築する。構築する施設は改築工事期間中、代替的に設置
する施設でもよいし、恒久的に設置する施設でもよい。
この実施例では、酸素式活性汚泥法による処理施設を構
築すべく、1系列の酸素式曝気槽OATおよび最終沈澱
池Fを築造した(図1(b))。
The place where the sedimentation basin P was initially provided, that is, the portion surrounded by the dashed line in FIG. 1 (a) is an empty space, and a single sewage treatment facility is constructed here. The facility to be constructed may be a facility to be installed as an alternative during the renovation work or a facility to be permanently installed.
In this example, a series of oxygen-type aeration tanks OAT and a final sedimentation basin F were constructed in order to construct a treatment facility by the oxygen-type activated sludge method (FIG. 1 (b)).

【0019】次に、図1(c)に示すように、上記改築
した1系列の施設で下水処理を行いながら、これまで下
水処理を行っていた老朽化した施設(一点鎖線で囲まれ
た部分)の改築に取りかかる。このように、改築済の施
設で下水処理を行いながら、老朽化した施設(酸素式曝
気槽OATおよび最終沈澱池F)を順次改築していくこ
とにより、全体の下水処理施設を更新・改築することが
できる。
Next, as shown in FIG. 1 (c), while the sewage treatment is being performed at the reconstructed one-line facility, the aging facility which has been performing the sewage treatment (the part surrounded by the dashed line) ). In this way, the entire sewage treatment facility is renewed and reconstructed by successively renovating aging facilities (oxygen-type aeration tank OAT and final sedimentation basin F) while performing sewage treatment at the renovated facility. be able to.

【0020】本実施例では、標準活性汚泥法による老朽
化した処理施設を酸素式活性汚泥法による処理施設に改
築したものであるが、改築後の下水処理施設はこれに限
られず、例えば、標準活性汚泥法による深層式処理施
設、または、最初沈澱池、曝気槽および最終沈澱池を地
上にまたは地下に重層式に設置する処理施設、さらに、
後述する固定化微生物を利用する処理施設などとするこ
ともできる。但し、酸素式活性汚泥法は上述したように
高負荷運転ができ、更に、所要敷地面積が少なくて済む
から、容量、用地とも余裕がない処理場の改築には有効
な方法である。
In the present embodiment, the aging treatment facility based on the standard activated sludge method is remodeled into a treatment facility based on the oxygen activated sludge method. However, the sewage treatment facility after the renovation is not limited to this. Deep sludge treatment facility by activated sludge method, or treatment facility in which first settling basin, aeration tank and final settling basin are installed on the ground or underground in a multi-layered manner,
It may be a treatment facility utilizing immobilized microorganisms described below. However, the oxygen-type activated sludge method can be operated at a high load as described above, and requires a small site area. Therefore, the oxygen-type activated sludge method is an effective method for renovating a treatment plant where there is no room in capacity and land.

【0021】老朽化した3系列の酸素式曝気槽OATと
最終沈澱池Fを改築したら、前記代替処理施設を解体し
撤去する。この跡地は他の施設の用地や空き地として利
用することができる。勿論、当該処理施設を恒久施設と
することにより4系列を構築し、下水処理場の処理能力
の増強を図ってもよい。
After renovating the aging three-line oxygen-type aeration tank OAT and final sedimentation basin F, the alternative treatment facility is dismantled and removed. This site can be used as a site or vacant land for other facilities. Of course, four lines may be constructed by making the treatment facility a permanent facility to increase the treatment capacity of the sewage treatment plant.

【0022】図2は本発明の別の実施例を説明するため
の下水処理施設の平面図であり、この実施例では最初に
改築しようとする1系列を除いた2系列の処理能力をそ
れぞれ1.5倍に高めることにより、改築設備を運転し
なくとも現有処理能力を暫定的に確保するものである。
このため、現有の曝気槽ATの中、2基を処理能力が促
進された曝気槽AATに変更し、かつ、この曝気槽AA
Tから流出する被処理水を3基の最終沈澱池Fに適宜振
り分けて下水処理を行う。ここで、曝気槽ATの処理能
力を促進する方法としては、前記酸素式曝気槽に変更し
てもよいし、あるいは、曝気槽中に固定化微生物を導入
することによって行ってもよい。
FIG. 2 is a plan view of a sewage treatment plant for explaining another embodiment of the present invention. In this embodiment, the processing capacity of two systems except for the first system to be reconstructed first is 1 By increasing it by a factor of five, the existing processing capacity will be provisionally secured without operating the renovation equipment.
For this reason, two of the existing aeration tanks AT are changed to an aeration tank AAT having an enhanced processing capacity, and the aeration tank AA
The water to be treated flowing out of T is appropriately distributed to the three final sedimentation basins F for sewage treatment. Here, as a method of promoting the processing capacity of the aeration tank AT, the method may be changed to the oxygen-type aeration tank, or may be performed by introducing immobilized microorganisms into the aeration tank.

【0023】本発明において、固定化微生物を利用する
活性汚泥法とは、下水中の有機汚濁成分を吸着、分解す
る微生物を、ポリアクリルアミド、ポリビニルアルコー
ル、砂、活性炭、シリカゲル、モレキュラーシーブ、ア
ルミナその他のセラミックス、などの不溶性の担体に、
共有結合力や物理的吸着力により固定化したり(担体結
合法)、あるいは、寒天、アルギン酸カルシウム、カラ
ギーナン、ポリアクリルアミド、ポリウレタンなどに前
記微生物を閉じ込めたものを(包括法)、曝気槽中に導
入することによって、その曝気槽の処理能力を促進する
方法をいう。
In the present invention, the activated sludge method using immobilized microorganisms refers to a microorganism which adsorbs and decomposes organic pollutants in sewage, which is composed of polyacrylamide, polyvinyl alcohol, sand, activated carbon, silica gel, molecular sieve, alumina and the like. Insoluble carriers such as ceramics,
Immobilization by covalent bonding or physical adsorption (carrier binding method) or introducing the microorganisms in agar, calcium alginate, carrageenan, polyacrylamide, polyurethane, etc. (inclusive method) and introducing them into the aeration tank In this way, it refers to a method of promoting the processing capacity of the aeration tank.

【0024】本実施例では、上述のように現状処理能力
を確保しながら、下水処理に供しない施設(図2(a)
において、一点鎖線で囲まれた部分)を改築する。図2
(b)は、この部分に、最初沈澱池P、曝気槽ATおよ
び最終沈澱池Fからなる処理系を1系列構築したことを
示しており、この処理系は改築前の1系列の1.5倍の
処理能力を有している。
In the present embodiment, facilities that are not used for sewage treatment while securing the current treatment capacity as described above (FIG. 2A)
In the area enclosed by the dashed line). FIG.
(B) shows that, in this part, one series of a treatment system consisting of the sedimentation basin P, the aeration tank AT and the final sedimentation basin F was constructed, and this treatment system was one series of 1.5 before the renovation. It has twice the processing capacity.

【0025】次いで、図2(b)に示すように、改築し
た1系列(処理能力:1.5倍)と既存の1系列(処理
能力:1.5倍)とを運転して、現状処理能力を確保し
ながら、残りの老朽化した施設(一点鎖線で囲まれた部
分)の改築に取りかかる。
Next, as shown in FIG. 2 (b), the reconstructed one system (processing capacity: 1.5 times) and the existing one system (processing capacity: 1.5 times) are operated to perform the current processing. Work on renovating the remaining aging facilities (the area enclosed by the dashed line) while securing the capacity.

【0026】図2(c)は、改築終了後の処理施設の配
置図であり、1系列の処理能力が従前の1.5倍に増強
された標準活性汚泥法による処理施設が2系列構築され
ることにより、処理場は改築前と同等の処理能力を有す
ることになる。なお、改築後の処理施設は、酸素式活性
汚泥法や固定化微生物を利用する処理施設であってもよ
い。また、同図(c)において、点線部のスペースは空
き地となるから、適当な用途に利用可能である。
FIG. 2 (c) is a layout diagram of the treatment facility after the completion of the renovation. Two treatment facilities based on the standard activated sludge method, in which the treatment capacity of one treatment system has been increased to 1.5 times the conventional one, are constructed. As a result, the treatment plant has the same treatment capacity as before the renovation. In addition, the treatment facility after the renovation may be a treatment facility using an oxygen activated sludge method or an immobilized microorganism. In FIG. 3C, the space indicated by the dotted line is a vacant land, and can be used for an appropriate purpose.

【0027】図3は、酸素式活性汚泥法を利用した別の
実施例を説明するための下水処理施設の平面図であり、
既存系列の処理能力を1.5倍に増強する点では図2に
示す実施例と轍を一にする。即ち、既存の2系列の曝気
槽ATを酸素式曝気槽OATに変更すると共に、酸素式
曝気槽OATから流出する微生物を含有した混合液の沈
澱分離能力の増強方法として、該混合液を既存の最終沈
澱池Fと最初沈澱池Pとに各施設の水面積に比例して分
流する。この実施例は、最初沈澱池Pと最終沈澱池Fの
構造が殆ど変わらず、また、整流板、スカム除去装置、
汚泥掻き寄せ機などの付帯施設も共通していることから
このような運転プロセスを採用したものである。
FIG. 3 is a plan view of a sewage treatment plant for explaining another embodiment using the oxygen activated sludge method.
The point that the processing capacity of the existing system is increased by 1.5 times is the same as that of the embodiment shown in FIG. That is, the existing two series of aeration tanks AT were changed to oxygen-type aeration tanks OAT, and the mixed liquids were used as a method for enhancing the sedimentation / separation ability of a mixture containing microorganisms flowing out of the oxygen-type aeration tanks OAT. The water is divided into the final sedimentation basin F and the first sedimentation basin P in proportion to the water area of each facility. In this embodiment, the structures of the initial settling basin P and the final settling basin F are almost the same, and a current plate, a scum removing device,
Such an operation process was adopted because the ancillary facilities such as a sludge scraper were also common.

【0028】本実施例では、1.5倍に増強した既存の
2系列を運転しながら、下水処理に供しない施設(図
3、一点鎖線で囲まれた部分)を改築し、その後、前記
実施例と同様に、残りの老朽化した施設を順次改築す
る。
In the present embodiment, a facility not used for sewage treatment (a portion surrounded by a dashed line in FIG. 3) was reconstructed while operating the existing two systems that were increased 1.5 times, and thereafter, As in the previous example, the remaining aging facilities will be gradually rebuilt.

【0029】図4に示す実施例も、図3に示す実施例と
同様に酸素式活性汚泥法を利用して処理能力を促進させ
る実施例であり、酸素式曝気槽OATから流出する微生
物を含有した混合液を、既存の最終沈澱池Fを経て、最
初沈澱池Pの順に流して混合液の沈澱分離を行うもので
ある。本実施例でも、ほぼ1.5倍に増強した既存の2
系列を運転しながら、下水処理に供しない施設(図4、
一点鎖線で囲まれた部分)を改築し、その後、前記実施
例と同様に、残りの老朽化した施設を順次改築する。
The embodiment shown in FIG. 4 is also an embodiment in which the treatment capacity is promoted by using the oxygen activated sludge method as in the embodiment shown in FIG. 3, and contains the microorganisms flowing out of the oxygen aeration tank OAT. The mixed liquid is passed through an existing final sedimentation basin F, and firstly flows in the order of the sedimentation basin P, to thereby separate and separate the mixture. Also in the present embodiment, the existing 2
Facilities that are not used for sewage treatment while operating the line (Fig. 4,
The area surrounded by the alternate long and short dash line) is renovated, and then the remaining deteriorated facilities are sequentially rebuilt in the same manner as in the above embodiment.

【0030】[0030]

【発明の効果】この発明によれば、最初沈澱池、曝気槽
および最終沈澱池からなる処理系を複数列備えた下水処
理施設において、代替施設用の空地がなく、下水の処理
能力にも余裕がない場合においても、当該施設の更新、
改築が可能となる。即ち、代替施設を設置するための用
地を確保する必要もなく、また、処理系列を段階的に改
築することにより、既存の曝気槽や沈澱池を有効に活用
することができ、施工性、経済性、および工期のいずれ
の点においても優れている。
According to the present invention, in a sewage treatment facility provided with a plurality of rows of treatment systems consisting of a first settling basin, an aeration tank and a final settling basin, there is no open space for a substitute facility, and the sewage treatment capacity is sufficient. Update of the facility,
Renovation is possible. In other words, there is no need to secure land for installing alternative facilities, and by gradually renovating the treatment line, existing aeration tanks and sedimentation basins can be used effectively, and workability and economy can be improved. Excellent in both properties and work period.

【0031】請求項1に記載された発明は、曝気槽およ
び最終沈澱池については改築前の系列をそのまま利用し
て、改築工事のために処理施設の1系列を運転停止する
ことがないから、安定した下水処理を行うことができ
る。
According to the first aspect of the present invention, since the aeration tank and the final sedimentation basin use the system before the renovation as it is and do not stop the operation of one of the processing facilities for the renovation work, Stable sewage treatment can be performed.

【0032】請求項2に記載された発明は、処理能力を
促進した曝気槽から流出する被処理水を複数の最終沈澱
池に適宜振り分けることのできる配管設備を設置するだ
けで済むので、施工が容易で経済的であるという優れた
効果を有している。
According to the second aspect of the present invention, it is only necessary to install piping equipment capable of appropriately distributing the water to be treated flowing out of the aeration tank having enhanced treatment capacity to a plurality of final sedimentation basins. It has an excellent effect of being easy and economical.

【0033】請求項3に記載された発明は、請求項2に
記載された発明における処理能力促進のために、曝気槽
中に材料費が安価な固定化微生物を導入するだけで達成
可能であり、特に、施工性、経済性、および工期に優れ
ている。
The invention described in claim 3 can be achieved only by introducing immobilized microorganisms having a low material cost into the aeration tank in order to promote the treatment capacity in the invention described in claim 2. In particular, it is excellent in workability, economy, and construction period.

【0034】請求項4に記載された発明は、請求項2に
記載された発明における処理能力促進のために、高効率
処理方法として実績のある酸素式活性汚泥法を導入して
いることから、極めて信頼性が高い。
The invention described in claim 4 adopts an oxygen-type activated sludge method which has been used as a high-efficiency treatment method in order to promote the treatment capacity in the invention described in claim 2. Extremely reliable.

【0035】請求項5に記載された発明は、最初沈澱
池、曝気槽および最終沈澱池からなる1系列を改築対象
施設とすることから、改築面積が大きく施工が容易とな
るとともに、曝気槽から流出する被処理水を最終沈澱池
と最初沈澱池の水面積に比例して分流するため、沈澱分
離効果が高く、安定した処理を行うことができる。
According to the fifth aspect of the present invention, since a series of a sedimentation basin, an aeration tank, and a final sedimentation basin is set as a target facility for renovation, the renovation area is large, the construction is easy, and the construction is easy. Since the outflow water to be treated is separated in proportion to the water area of the final sedimentation basin and the first sedimentation basin, the sedimentation separation effect is high and stable treatment can be performed.

【0036】請求項6に記載された発明は、請求項5に
記載された発明と同じく、改築面積を大きくとることが
できるとともに、被処理水を最終沈澱池から最初沈澱池
の順に流す配管設備を設置するだけでよく、施工性と経
済性に優れる。
According to the sixth aspect of the present invention, similar to the fifth aspect of the present invention, the renovation area can be increased, and the piping system for flowing the water to be treated in the order from the final sedimentation basin to the first sedimentation basin. Only need to be installed, which is excellent in workability and economy.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明による改築方法の好適な実施例を示す平
面配置図である。
FIG. 1 is a plan view showing a preferred embodiment of a rebuilding method according to the present invention.

【図2】本発明の別の改築方法を示す下水処理施設の平
面図である。
FIG. 2 is a plan view of a sewage treatment facility showing another remodeling method of the present invention.

【図3】酸素式活性汚泥法を利用する別の実施例を示す
下水処理施設の平面図である。
FIG. 3 is a plan view of a sewage treatment facility showing another embodiment using the oxygen activated sludge method.

【図4】酸素式活性汚泥法を利用する他の実施例を示す
下水処理施設の平面図である。
FIG. 4 is a plan view of a sewage treatment plant showing another embodiment using an oxygen activated sludge method.

【図5】活性汚泥法による下水処理場の主要部の断面図
である。
FIG. 5 is a sectional view of a main part of a sewage treatment plant by an activated sludge method.

【図6】標準活性汚泥法による下水処理施設の代表的な
平面配置図である。
FIG. 6 is a typical plan layout view of a sewage treatment facility by a standard activated sludge method.

【図7】代表的な酸素式活性汚泥法のフローシートであ
る。
FIG. 7 is a flow sheet of a typical oxygen activated sludge method.

【符号の説明】[Explanation of symbols]

P 最初沈澱池 AT 曝気槽 OAT 酸素式曝気槽 AAT 促進型曝気槽 F 最終沈澱池 OG 酸素発生装置 M 撹拌機 P First settling tank AT Aeration tank OAT Oxygen type aeration tank AAT accelerated aeration tank F Final settling tank OG Oxygen generator M Stirrer

───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐々木 静郎 茨城県つくば市大字鬼ヶ窪字下山1043番 1 株式会社熊谷組 技術研究所内 (72)発明者 田辺 大次郎 東京都新宿区津久戸町2番1号 株式会 社熊谷組 東京本社内 (72)発明者 石田 良平 茨城県つくば市大字鬼ヶ窪字下山1043番 1 株式会社熊谷組 技術研究所内 (56)参考文献 特開 昭61−138594(JP,A) 特開 平3−52694(JP,A) (58)調査した分野(Int.Cl.7,DB名) C02F 1/00,3/12 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shizuo Sasaki 1043, Shimoyama, Onigakubo, Tsukuba, Ibaraki Pref. 1 Inside Kumagaya Gumi Technical Research Institute (72) Inventor Daijiro Tanabe 2nd Tsukudocho, Shinjuku-ku, Tokyo No. 1 Kumagaya Gumi Tokyo head office (72) Inventor Ryohei Ishida 1043 Shimoyama, Onigakubo, Tsukuba, Ibaraki Pref. 1 Kumagaya Gumi Co., Ltd. Technical Research Institute (56) References JP-A-61-138594 (JP) , A) JP-A-3-52694 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C02F 1/00, 3/12

Claims (6)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 最初沈殿池、曝気槽および最終沈澱池か
らなる処理系を複数列備えた下水処理施設の改築方法に
おいて、曝気槽に供給する空気を高濃度の酸素に代え、
下水を最初沈澱池を経由せずに直接曝気槽に導入して下
水処理を行いつつ、該最初沈澱池位置に改築施設を構築
し、次いで、該改築施設で下水処理を行いつつ、下水処
理に供しない施設を順次改築していくことを特徴とする
下水処理施設の改築方法。
In a method of renovating a sewage treatment facility having a plurality of treatment systems including a first settling tank, an aeration tank, and a final settling tank, air supplied to the aeration tank is replaced with high-concentration oxygen.
The sewage is first introduced into the aeration tank directly without passing through the sedimentation basin, and the sewage treatment is performed while the sewage treatment is performed while the renovation facility is constructed at the position of the first sedimentation basin. A method of rebuilding a sewage treatment facility, characterized by sequentially rebuilding facilities that will not be provided.
【請求項2】 最初沈澱池、曝気槽および最終沈澱池か
らなる処理系を複数列備えた下水処理施設の改築方法に
おいて、改築すべき曝気槽以外の曝気槽の処理能力を高
め、当該曝気槽で処理した下水を最終沈澱池に振り分け
て下水処理を行いつつ、1系列の最初沈澱池と曝気槽を
改築し、次いで、改築済の施設で下水処理を行いつつ、
下水処理に供しない施設を順次改築していくことを特徴
とする下水処理施設の改築方法。
2. A method for rebuilding a sewage treatment facility having a plurality of treatment systems including a first settling tank, an aeration tank, and a final settling tank, wherein the processing capacity of an aeration tank other than the aeration tank to be remodeled is increased. While the sewage treated in the above is distributed to the final sedimentation basin and the sewage treatment is performed, the first sedimentation basin and the aeration tank of one series are reconstructed, and then the sewage treatment is performed in the renovated facility.
A method of rebuilding a sewage treatment facility characterized by sequentially rebuilding facilities that are not used for sewage treatment.
【請求項3】 前記曝気槽中に固定化微生物を導入する
ことにより曝気槽の処理能力を高めた請求項2記載の下
水処理施設の改築方法。
3. The method according to claim 2, wherein the treatment capacity of the aeration tank is increased by introducing immobilized microorganisms into the aeration tank.
【請求項4】 前記曝気槽中に高濃度の酸素を導入する
ことにより曝気槽の処理能力を高めた請求項2記載の下
水処理施設の改築方法。
4. The method according to claim 2, wherein the treatment capacity of the aeration tank is increased by introducing high-concentration oxygen into the aeration tank.
【請求項5】 最初沈澱池、曝気槽および最終沈澱池か
らなる処理系を複数列備えた下水処理施設の改築方法に
おいて、改築すべき曝気槽以外の曝気槽に供給する空気
を高濃度の酸素に代え、下水を最初沈澱池を経由せずに
直接当該曝気槽に導入した後、最終沈澱池と最初沈澱池
とに分流して下水処理を行いつつ、1系列の最初沈澱
池、曝気槽および最終沈澱池を改築し、次いで、改築済
の施設で下水処理を行いつつ、下水処理に供しない施設
を順次改築していくことを特徴とする下水処理施設の改
築方法。
5. A method for rebuilding a sewage treatment facility having a plurality of rows of a treatment system including a first settling tank, an aeration tank and a final settling tank, wherein air supplied to an aeration tank other than the aeration tank to be remodeled has a high oxygen concentration. Instead, the sewage is directly introduced into the aeration tank without first passing through the sedimentation basin, and then divided into the final sedimentation basin and the first sedimentation basin for sewage treatment, while a series of first sedimentation basin, aeration tank and A method for rebuilding a sewage treatment facility, comprising rebuilding a final sedimentation basin, and then sequentially rebuilding facilities that are not used for sewage treatment while treating sewage at the renovated facilities.
【請求項6】 最初沈澱池、曝気槽および最終沈澱池か
らなる処理系を複数列備えた下水処理施設の改築方法に
おいて、改築すべき曝気槽以外の曝気槽に供給する空気
を高濃度の酸素に代え、下水を最初沈澱池を経由せずに
直接当該曝気槽に導入した後、最終沈澱池、最初沈澱池
の順に流して下水処理を行いつつ、1系列の最初沈澱
池、曝気槽および最終沈澱池を改築し、次いで、改築済
の施設で下水処理を行いつつ、下水処理に供しない施設
を順次改築していくことを特徴とする下水処理施設の改
築方法。
6. A method of renovating a sewage treatment facility having a plurality of rows of a treatment system including a first settling tank, an aeration tank, and a final settling tank, wherein air supplied to an aeration tank other than the aeration tank to be reconstructed has a high oxygen concentration. Instead, the sewage is directly introduced into the aeration tank without first passing through the sedimentation basin, and then the final sedimentation basin, the first sedimentation basin are flowed in this order, and the sewage is treated. A method for rebuilding a sewage treatment facility, comprising rebuilding a sedimentation basin, and then sequentially rebuilding facilities that are not used for sewage treatment while treating sewage at the renovated facilities.
JP30296494A 1994-11-12 1994-11-12 How to rebuild sewage treatment facilities Expired - Fee Related JP3154904B2 (en)

Priority Applications (1)

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JP30296494A JP3154904B2 (en) 1994-11-12 1994-11-12 How to rebuild sewage treatment facilities

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JP30296494A JP3154904B2 (en) 1994-11-12 1994-11-12 How to rebuild sewage treatment facilities

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Publication number Priority date Publication date Assignee Title
JP4240944B2 (en) * 2002-07-31 2009-03-18 栗田工業株式会社 Construction method of pure water production apparatus and pure water supply apparatus
JP5651384B2 (en) * 2010-06-18 2015-01-14 株式会社クボタ Sewage treatment equipment, sewage treatment method, and method for renovating sewage treatment equipment
JP5961489B2 (en) * 2012-08-28 2016-08-02 宇都宮工業株式会社 Sedimentation basin repair work method and auxiliary equipment for repair work
JP6853107B2 (en) * 2017-05-17 2021-03-31 株式会社クボタ How to reconstruct wastewater treatment facility
JP6470817B1 (en) * 2017-10-30 2019-02-13 月島機械株式会社 Maintenance method for sedimentation basin facilities
JP7339726B2 (en) * 2018-03-12 2023-09-06 住友重機械エンバイロメント株式会社 Renewal method of water treatment tank

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