JP3716461B2 - Concentration method in the receiving tank for biological filtration backwash wastewater - Google Patents
Concentration method in the receiving tank for biological filtration backwash wastewater Download PDFInfo
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- JP3716461B2 JP3716461B2 JP23202895A JP23202895A JP3716461B2 JP 3716461 B2 JP3716461 B2 JP 3716461B2 JP 23202895 A JP23202895 A JP 23202895A JP 23202895 A JP23202895 A JP 23202895A JP 3716461 B2 JP3716461 B2 JP 3716461B2
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- Prior art keywords
- tank
- backwash
- biological filtration
- sludge
- receiving
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- 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.)
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- Filtration Of Liquid (AREA)
Description
【0001】
【発明が属する技術分野】
本発明は、排水を生物ろ過層に通水して生物的に処理する際に発生する、生物ろ過装置の逆洗排水の受槽、特に汚泥濃縮機能を有する受槽に関するものである。
【0002】
【従来の技術】
好気性生物処理あるいは嫌気性生物処理において、近年生物ろ過装置が注目されている。
生物ろ過装置は反応槽内に微生物を高濃度に維持できるため、反応槽体積当たりの処理能力が高く、また、担体表面に微生物を付着させているため、処理水の固液分離に沈澱池を必要とせず小さな設置面積でよい等の利点がある。
さらに、ろ過機能を有するため金属塩系の凝集剤を添加することでリンをろ過除去することも可能である。
一方、生物ろ過装置においては、ろ過時間の経過とともに懸濁物(SS)の捕捉と余剰汚泥の発生により生物ろ過層が閉塞してくるため、定期的に洗浄が必要となる。
通常、洗浄は生物ろ過層に浄化処理時の通水とは逆方向に洗浄水を供給し、ろ過層を展開してろ過層に捕捉さているSSを剥離する。
この際SSを含む逆洗排水が発生する。
発生した逆洗排水はSS分を濃縮した後、脱水機で脱水処理する。
【0003】
従来は、この生物ろ過層の逆洗排水は、逆洗時に一度に大量に発生するため、一時貯留する逆洗排水受槽が必要であり、また、逆洗排水の懸濁物(SS)濃度が低い(たとえば、300〜2000 mg/l)ため、逆洗排水受槽の後段に汚泥濃縮槽を設置して上澄水を分離するのが一般的であった。
【0004】
【発明が解決しようとする課題】
従来の装置は、逆洗排水の貯槽とは別に汚泥濃縮槽を設けているので、設置面積が大きくなるばかりでなく、汚泥濃縮槽には汚泥を掻き寄せるためのレーキ等の大型で、複雑な機構の付帯機器が必要で、メインテナンスを十分に行う必要があったり、コストが増大する問題があった。
本発明は、従来装置の問題点を解決するものであり、簡単な構造で、故障が少ない逆洗排水受槽を設け、汚泥濃縮槽を不要とするものである。
【0005】
【課題を解決するための手段】
本発明は、生物ろ過装置を逆洗したときに発生する逆洗排水を受け入れる槽であって、前記槽は底部に排泥口、中間部に上澄水排出口を有し、前記排出口より下方の槽内に散気手段が設けられている生物ろ過逆洗排水の受槽に受け入れた逆洗排水を濃縮する際、逆洗排水を該受槽に受け入れた後、静置し、静置して分離された上澄水を該上澄水排出口から排出し、次に該散気手段より曝気を行って汚泥を均一化し、均一化された汚泥を該排泥口から排出することを特徴とする生物ろ過逆洗排水の受槽での濃縮方法である。
【0006】
本発明は、生物ろ過層の逆洗排水中のSSは、主に生物ろ過層から剥離した生物膜であり、粒子径、密度が大きいため沈降速度も大きいことに着目してなされたものである。
すなわち、沈降速度が大きいことから、逆洗排水受槽においてSSを沈降濃縮し、上澄水と濃縮汚泥とに分離してそれぞれを排出するので、従来の受槽と濃縮槽とを兼用することができる。
【0007】
【発明の実施の形態】
図1は、本発明で用いる生物ろ過逆洗排水の受槽の一例を示す縦断面図であり、1は槽、2は排泥口、3は上澄水排出口、4は散気手段、5は逆洗排水導入管を示す。
槽1は受槽となるものであって、方形、円筒形の任意形状のタンクであり、1回の逆洗排水の量を受け入れられる容量を有している。
槽1は生物ろ過装置(図示せず)の下方あるいは側近に設置されるのがよく、生物ろ過装置とは逆洗排水導入管5を介して連絡している。
槽1の底部には排泥口2が開口しており、排泥口2、排泥管6により汚泥が排出可能となっている。
槽1の底部は若干の傾斜をつけ、最深部に汚泥ピット部を設け、汚泥ピット部に排泥口2を開口するのがよく、汚泥を残留することなく排出できる。
槽1の中間深部には上澄水排出口3が開口している。
上澄水排出口3は排水管7が槽1の側壁を貫通するようにして形成されている。
上澄水排出口3の位置は逆洗排水を沈降分離した際の汚泥界面の位置より若干上方になるように設置する。
排水管7には弁、ポンプが設けられている。
また、槽1の底部付近に散気管4等の散気手段が設置され、ブロワにより空気が供給されるようになっている。
【0008】
本発明において、上述したような生物ろ過逆洗排水の受槽は、逆洗排水が発生したときに以下のように作用する。
すなわち、生物ろ過層の逆洗が始まると、生物ろ過装置から排出される逆洗排水は逐次逆洗排水導入管5を介して槽1に導入される。
逆洗工程が終了し、全ての逆洗排水が槽1に受け入れられると、5〜40分間静置状態におかれ、汚泥と上澄水とに分離される。
分離されたところで排水管の弁、ポンプを作動し、上澄水排出口3から上澄水のみを排出する。
上澄水を排出した段階で、次に散気手段4より曝気を行い、上澄水排出口3より下方に残留している上澄水と沈澱した汚泥とをかくはんし、均一化する。
均一化された汚泥は底部の排泥口2から排出される。
【0009】
本発明においては、逆洗排水中のSSは主に剥離した生物膜の粒子であり、粒子径、密度が大きいため沈降速度が大きく、例えば3.5m/分程度の沈降速度を有するため、前述の静置により汚泥と上澄水とに容易に分離され、そして分離された上澄水を排出するので、濃縮された汚泥となる。
曝気により濃縮された汚泥は容易に均一な分散状態になり、流動性よく、受槽から確実に全量排出される。
また、排出される汚泥は曝気により酸素が与えられ、腐敗による臭気発生が抑制される。
【0010】
本発明の生物ろ過逆洗排水の受槽は、担体に微生物を付着させて使用する任意の生物ろ過装置の逆洗排水に適用でき、生物ろ過装置は浮上性の担体を用いる上向流式でも、比重の大きい担体を用いる下向流式でもよく、また、好気性、嫌気性の生物ろ過、あるいはBOD除去、窒素除去を目的とする生物ろ過であってもよい。
【0011】
【実施例】
図1に示す受槽を用いて、A下水処理場に設置したパイロットプラントの生物ろ過装置(硝化脱窒用)より排出された逆洗排水の沈降濃縮試験を行った。
逆洗排水の受槽の容量は100リットルであり、逆洗排水を90リットル受け入れた後20分間静置し、その後上澄水を排出口から87リットル排出した。
つづいて散気管から空気をLV5m/時間の割合で3分間供給したのち、濃縮汚泥を排出した。
この試験において、逆洗排水のSS濃度380mg/lが受槽から排出された汚泥のSS濃度10300mg/lまで濃縮され、良好な濃縮分離性が確認できた。
【0012】
【発明の効果】
以上の通り、本発明で用いる生物ろ過逆洗排水の受槽は下部に散気手段、中間に上澄水排出口を設けるだけの簡易な装置を付加することにより、従来の汚泥濃縮槽を省略することができて設置面積が小さくでき、従来のようなレーキ機構がなく故障がほとんどなく、また、排出汚泥に酸素が付与されて臭気の発生が抑制される。
【0013】
【図面の簡単な説明】
図1は本発明で用いる受槽の一例を示す縦断面図である。
1:槽、2:排泥口、3:上澄水排出口
4:散気管、5:逆洗排水導入管[0001]
[Technical field to which the invention belongs]
The present invention relates to a receiving tank for backwash wastewater of a biological filtration device, particularly a receiving tank having a sludge concentration function, which occurs when wastewater is passed through a biological filtration layer and biologically treated.
[0002]
[Prior art]
In recent years, biological filtration devices have attracted attention in aerobic biological treatment or anaerobic biological treatment.
Since the biological filtration device can maintain a high concentration of microorganisms in the reaction tank, the treatment capacity per reaction tank volume is high, and because the microorganisms are attached to the surface of the carrier, a sedimentation basin is used for solid-liquid separation of the treated water. There is an advantage that a small installation area is not required.
Furthermore, since it has a filtration function, it is also possible to remove phosphorus by filtration by adding a metal salt-based flocculant.
On the other hand, in the biological filtration apparatus, since the biological filtration layer is clogged due to the capture of the suspended solid (SS) and the generation of excess sludge as the filtration time elapses, regular cleaning is required.
Usually, in washing, the washing water is supplied to the biological filtration layer in the direction opposite to the water flow during the purification treatment, and the filtration layer is developed to separate the SS trapped in the filtration layer.
At this time, backwash wastewater containing SS is generated.
The generated backwash wastewater is concentrated with SS and then dehydrated with a dehydrator.
[0003]
Conventionally, since the backwash wastewater from the biological filtration layer is generated in a large amount at the time of backwashing, a backwash wastewater receiving tank for temporary storage is required, and the suspension (SS) concentration of backwash wastewater is high. Since it is low (for example, 300 to 2000 mg / l), it is common to separate the supernatant water by installing a sludge concentration tank after the backwash drainage tank.
[0004]
[Problems to be solved by the invention]
The conventional equipment is equipped with a sludge concentration tank separately from the backwash drainage storage tank, which not only increases the installation area, but also the sludge concentration tank is a large, complex rake, etc. Attached equipment of the mechanism is necessary, and there is a problem that it is necessary to perform sufficient maintenance and the cost increases.
The present invention solves the problems of the conventional apparatus, is provided with a backwash drainage tank having a simple structure and few failures, and makes a sludge concentration tank unnecessary.
[0005]
[Means for Solving the Problems]
The present invention is a tank for receiving backwash drainage generated when a biological filtration device is backwashed. The tank has a drainage port at the bottom and a supernatant discharge port at the middle, and is below the discharge port. when concentrating the backwash waste water aeration unit accepts the provided raw material that has filtered backwash waste water receiving tank in the tank, after receiving the backwash drainage to the receiving vessel, and allowed to stand, and allowed to stand An organism characterized in that the separated supernatant water is discharged from the supernatant water outlet, and then aerated by the aeration means to make the sludge uniform, and the uniformed sludge is discharged from the outlet. This is a concentration method in a receiving tank for filtration backwash wastewater .
[0006]
The present invention is made by paying attention to the fact that SS in the backwash waste water of the biofiltration layer is a biofilm mainly peeled off from the biofiltration layer, and has a large sedimentation speed due to its large particle size and density. .
That is, since the sedimentation speed is high, SS is settled and concentrated in the backwash waste water receiving tank, separated into supernatant water and concentrated sludge, and each is discharged, so that the conventional receiving tank and concentration tank can be used together.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view showing an example of a biological filtration backwash drainage tank used in the present invention, wherein 1 is a tank, 2 is a mud outlet, 3 is a supernatant water outlet, 4 is an air diffuser, The backwash drainage pipe is shown.
The tank 1 serves as a receiving tank and is a rectangular or cylindrical tank having an arbitrary shape, and has a capacity capable of receiving a single backwash drainage amount.
The tank 1 is preferably installed below or close to a biological filtration device (not shown), and communicates with the biological filtration device via a backwash
A drainage port 2 is opened at the bottom of the tank 1, and sludge can be discharged by the drainage port 2 and the drainage pipe 6.
The bottom of the tank 1 is slightly inclined, and a sludge pit portion is provided at the deepest portion, and a discharge port 2 is preferably opened in the sludge pit portion, so that sludge can be discharged without remaining.
A supernatant water discharge port 3 is opened in an intermediate deep portion of the tank 1.
The supernatant water discharge port 3 is formed so that the
The position of the supernatant water discharge port 3 is set to be slightly above the position of the sludge interface when the backwash wastewater is settled and separated.
The
Further, an air diffuser such as an air diffuser 4 is installed near the bottom of the tank 1 so that air is supplied by a blower.
[0008]
In the present invention , the biological filtration backwash drainage tank as described above operates as follows when backwash wastewater is generated.
That is, when the backwashing of the biological filtration layer is started, backwash wastewater discharged from the biological filtration device is sequentially introduced into the tank 1 through the backwash
When the backwashing process is completed and all backwash wastewater is received in the tank 1, the tank 1 is left standing for 5 to 40 minutes and separated into sludge and supernatant water.
When separated, the drain pipe valve and pump are operated, and only the supernatant water is discharged from the supernatant water discharge port 3.
At the stage of discharging the supernatant water, aeration is then performed from the aeration means 4, and the supernatant water remaining below the supernatant water discharge port 3 and the precipitated sludge are stirred and homogenized.
The homogenized sludge is discharged from the bottom mud outlet 2.
[0009]
In the present invention, SS in backwash wastewater is mainly peeled biofilm particles, and since the particle size and density are large, the sedimentation speed is large, for example, the sedimentation speed is about 3.5 m / min. In this case, the sludge is easily separated into sludge and supernatant water, and the separated supernatant water is discharged, so that it becomes concentrated sludge.
The sludge concentrated by aeration easily becomes a uniform dispersed state, and is fully discharged from the receiving tank with good fluidity.
Moreover, the discharged sludge is given oxygen by aeration, and the generation of odor due to decay is suppressed.
[0010]
The biological filtration backwash wastewater receiving tank of the present invention can be applied to the backwash wastewater of any biological filtration device used by attaching microorganisms to the carrier, and the biological filtration device is an upward flow type using a floating carrier, It may be a downward flow type using a carrier having a large specific gravity, or may be an aerobic or anaerobic biological filtration, or a biological filtration for the purpose of removing BOD or nitrogen.
[0011]
【Example】
Using the receiving tank shown in FIG. 1, a sedimentation concentration test of backwash wastewater discharged from a biological filtration device (for nitrification denitrification) of a pilot plant installed in the A sewage treatment plant was conducted.
The capacity of the backwash wastewater receiving tank was 100 liters, and after receiving 90 liters of backwash wastewater, it was allowed to stand for 20 minutes, and then 87 liters of supernatant water were discharged from the outlet.
Subsequently, air was supplied from the air diffuser at a rate of LV 5 m / hour for 3 minutes, and then the concentrated sludge was discharged.
In this test, the SS concentration of 380 mg / l of the backwash waste water was concentrated to the SS concentration of 10300 mg / l of the sludge discharged from the receiving tank, and good concentration and separability could be confirmed.
[0012]
【The invention's effect】
As described above, the biological filtration backwash wastewater receiving tank used in the present invention omits the conventional sludge concentrating tank by adding a simple device only to provide a diffuser means at the bottom and a supernatant water outlet in the middle. Therefore, the installation area can be reduced, there is no rake mechanism as in the prior art, there is almost no failure, and oxygen is imparted to the discharged sludge to suppress the generation of odor.
[0013]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a receiving tank used in the present invention.
1: tank, 2: mud discharge port, 3: supernatant water discharge port 4: aeration pipe, 5: backwash drainage introduction pipe
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP23202895A JP3716461B2 (en) | 1995-08-17 | 1995-08-17 | Concentration method in the receiving tank for biological filtration backwash wastewater |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP23202895A JP3716461B2 (en) | 1995-08-17 | 1995-08-17 | Concentration method in the receiving tank for biological filtration backwash wastewater |
Publications (2)
Publication Number | Publication Date |
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JPH0952094A JPH0952094A (en) | 1997-02-25 |
JP3716461B2 true JP3716461B2 (en) | 2005-11-16 |
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JP23202895A Expired - Fee Related JP3716461B2 (en) | 1995-08-17 | 1995-08-17 | Concentration method in the receiving tank for biological filtration backwash wastewater |
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KR101408850B1 (en) * | 2013-06-17 | 2014-06-23 | 유병화 | No drain combined recirculating aquacultural system having such |
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