JPH09141006A - Flocculating and settling device - Google Patents
Flocculating and settling deviceInfo
- Publication number
- JPH09141006A JPH09141006A JP30263795A JP30263795A JPH09141006A JP H09141006 A JPH09141006 A JP H09141006A JP 30263795 A JP30263795 A JP 30263795A JP 30263795 A JP30263795 A JP 30263795A JP H09141006 A JPH09141006 A JP H09141006A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- sand
- tank
- flocculating
- settling tank
- 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.)
- Granted
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は凝集沈殿装置に係
り、特に、下水や活性汚泥処理水のような有機性ＳＳを
含む原水を砂添加によって高沈降速度で凝集沈殿処理し
て、ＳＳを効率的に除去する凝集沈殿装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coagulation-sedimentation apparatus, and particularly to coagulation-sedimentation of raw water containing organic SS such as sewage or activated sludge treated water at a high sedimentation rate by adding sand to improve SS efficiency. The present invention relates to a coagulation-sedimentation apparatus that removes it selectively.
【０００２】[0002]
【従来の技術】従来、被処理水中のＳＳを除去するため
の凝集沈殿装置として、原水に粒径１０〜１００μｍ程
度の石英砂２〜４ｋｇ／ｍ3 と高分子凝集剤１０〜２０
ｇ／ｍ3 とを添加して凝集沈殿槽で凝集沈殿処理し、凝
集沈殿槽の槽下部から引き抜いた汚泥からサイクロンで
石英砂を分離回収して再利用する方法が提案されてい
る。なお、砂を分離した後の汚泥は系外へ排出する。2. Description of the Related Art Conventionally, as a coagulating sedimentation device for removing SS in water to be treated, 2-4 kg / m 3 of quartz sand having a particle size of about 10 to 100 μm and a polymer coagulating agent of 10 to 20 in raw water are used.
A method has been proposed in which g / m 3 is added and coagulation-sedimentation treatment is performed in a coagulation-sedimentation tank, and quartz sand is separated and collected by a cyclone from sludge extracted from the bottom of the coagulation-sedimentation tank and reused. The sludge after separating the sand is discharged to the outside of the system.
【０００３】この方法によれば、高分子凝集剤でＳＳを
凝集する際に、砂を巻き込むことで凝集塊の沈降速度を
高め、高速で凝集沈殿処理することができる。According to this method, when SS is coagulated by the polymer coagulant, sand is entrained to increase the sedimentation speed of the coagulated mass, and the coagulation-sedimentation process can be performed at high speed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の方法では、 下水や活性汚泥処理水のような有機性ＳＳを含む原
水に対しては、ＳＳを効率的に凝集沈殿処理することが
できない。 高分子凝集剤を多量に添加しないと、砂と原水中の
ＳＳとのからみ合いを良くすることができず、砂とＳＳ
との分離で高速処理ができない。 高速処理を行うと、沈殿槽から汚泥が流出して処理
水質が低下し、処理を継続し得ない場合がある。 といった問題がある。However, according to the above-mentioned conventional method, SS cannot be efficiently coagulated and precipitated for raw water containing organic SS such as sewage or activated sludge treated water. If a large amount of polymer flocculant is not added, the entanglement between sand and SS in raw water cannot be improved, and sand and SS
High-speed processing is not possible due to separation from When high-speed treatment is carried out, sludge may flow out from the settling tank and the quality of treated water may deteriorate, and treatment may not be continued. There is a problem.
【０００５】本発明は上記従来の問題点を解決し、有機
性ＳＳを含む原水に対しても効率的な凝集沈殿処理を行
うことができ、高分子凝集剤添加量の低減も可能な凝集
沈殿装置を提供することを目的とする。The present invention solves the above-mentioned conventional problems and enables efficient coagulation-sedimentation treatment of raw water containing organic SS, and also enables reduction of the amount of addition of polymer coagulant. The purpose is to provide a device.
【０００６】[0006]
【課題を解決するための手段】本発明の凝集沈殿装置
は、原水に凝集剤及び砂を添加して凝集処理する凝集槽
と、該凝集槽の流出水が導入されるスラッジブランケッ
ト型沈殿槽と、該沈殿槽内のスラッジブランケット下部
の汚泥を引き抜いて前記凝集槽に循環する手段と、該ス
ラッジブランケットの中部又は上部の汚泥を引き抜いて
サイクロンで砂を分離し、分離した砂を前記凝集槽に返
送する手段とを備えてなることを特徴とする。The coagulation-sedimentation apparatus of the present invention comprises a coagulation tank for coagulating a raw water with a coagulant and sand, and a sludge blanket type sedimentation tank into which the outflow water of the coagulation tank is introduced. A means for extracting sludge from the lower part of the sludge blanket in the settling tank and circulating the sludge to the flocculation tank; and extracting sludge from the middle or upper part of the sludge blanket to separate sand with a cyclone, and separating the sand into the flocculating tank. And a means for returning it.
【０００７】凝集剤と砂が添加されて凝集処理された水
が導入される沈殿槽においては、砂を多く含む重い汚泥
が下部に、砂が少なく軽い汚泥が上部にたまってスラッ
ジブランケット層を形成している。また、スラッジブラ
ンケットの上層の汚泥に含まれる砂が重力で汚泥から分
離して下層へ沈降することによっても、スラッジブラン
ケット層の汚泥は上層で軽く、下層で重いものとなる。In a settling tank into which coagulant and sand are added and coagulated water is introduced, heavy sludge containing a large amount of sand is accumulated in the lower part, and sludge containing less sand is accumulated in the upper part to form a sludge blanket layer. doing. Further, when the sand contained in the upper sludge of the sludge blanket is separated from the sludge by gravity and settles to the lower layer, the sludge in the sludge blanket layer becomes light in the upper layer and heavy in the lower layer.
【０００８】このような沈殿槽において、汚泥を槽下部
から引き抜いてサイクロンで砂を分離回収して再利用
し、汚泥を排出する方法では、砂が少なく軽い汚泥が槽
上部に層を形成し、経時的にこれが徐々に貯って遂には
槽上部から流出するようになる。この流出を防止するた
めには、沈殿槽の通水ＬＶを低くする必要があり高速処
理ができない。また、有機性ＳＳの凝集沈殿効率が悪
い、高分子凝集剤の必要添加量が多いといった問題があ
った。In such a settling tank, sludge is drawn out from the lower part of the tank, the sand is separated and collected by a cyclone and reused, and in the method of discharging sludge, light sludge with little sand forms a layer on the upper part of the tank, It gradually accumulates over time and eventually comes out of the upper part of the tank. In order to prevent this outflow, it is necessary to lower the water flow LV in the settling tank, and high-speed processing cannot be performed. In addition, there are problems that the efficiency of aggregation and precipitation of the organic SS is low and the required amount of the polymer flocculant is large.
【０００９】本発明では、沈殿槽のスラッジブランケッ
ト下部の、砂を多く含み重い汚泥を引き抜いて凝集槽に
循環する。この汚泥の循環で砂を有効再利用すると共
に、凝集槽における凝集効率を高め、有機性ＳＳの凝集
沈殿を効果的に行い、高分子凝集剤の必要添加量を低減
することができる。また、スラッジブランケット中部又
は上部の、砂が少なく軽い汚泥を引き抜くため、沈殿槽
上部からの汚泥の流出を防止することができる。また、
引き抜いた汚泥からサイクロンで砂を分離して凝集槽に
戻すため、砂を有効に再利用することができる。In the present invention, heavy sludge containing a large amount of sand in the lower part of the sludge blanket of the settling tank is extracted and circulated to the coagulating tank. It is possible to effectively reuse the sand by circulating the sludge, enhance the coagulation efficiency in the coagulation tank, effectively perform the coagulation and precipitation of the organic SS, and reduce the necessary addition amount of the polymer coagulant. In addition, since sludge with a small amount of sand and light sludge in the middle or upper part of the sludge blanket is extracted, it is possible to prevent the sludge from flowing out from the upper part of the settling tank. Also,
Cyclone separates the sand from the extracted sludge and returns it to the flocculation tank, so that the sand can be reused effectively.
【００１０】[0010]
【発明の実施の形態】以下図面を参照して本発明を詳細
に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.
【００１１】図１は本発明の凝集沈殿装置の一実施例を
示す系統図である。FIG. 1 is a system diagram showing an embodiment of the coagulating sedimentation apparatus of the present invention.
【００１２】図１において、１は凝集槽であり、原水に
無機凝集剤及び砂を添加する第１攪拌槽２と、高分子凝
集剤を添加する第２攪拌槽３とを備える。４は回転レー
キ５を備えるスラッジブランケット型沈殿槽であり、中
央筒体６及び汚泥引抜管７を有する越流堰８が回転レー
キ５の回転軸５Ａと同軸的に設けられている。９はサイ
クロンである。１０は沈殿槽４内に形成されたスラッジ
ブランケットを示す。In FIG. 1, reference numeral 1 denotes a coagulation tank, which comprises a first stirring tank 2 for adding an inorganic coagulant and sand to raw water and a second stirring tank 3 for adding a polymer coagulant. Reference numeral 4 is a sludge blanket type sedimentation tank having a rotary rake 5, and an overflow weir 8 having a central tubular body 6 and a sludge drawing pipe 7 is provided coaxially with a rotary shaft 5A of the rotary rake 5. 9 is a cyclone. Reference numeral 10 denotes a sludge blanket formed in the settling tank 4.
【００１３】本実施例の凝集沈殿装置では、まず、凝集
槽１の第１攪拌槽２において、原水に無機凝集剤と砂を
添加して攪拌する。In the coagulation-sedimentation apparatus of this embodiment, first, in the first stirring tank 2 of the coagulation tank 1, the inorganic coagulant and sand are added to the raw water and stirred.
【００１４】無機凝集剤としては、塩化第二鉄（ＦｅＣ
ｌ3 ）、硫酸第二鉄（Ｆｅ2 （ＳＯ4 ）3 ）、ポリ塩化
アルミニウム、硫酸アルミニウム等を用いることがで
き、その添加量は原水に対して１０〜１０００ｍｇ／Ｌ
（リットル）とするのが好ましい。As the inorganic coagulant, ferric chloride (FeC
l 3 ), ferric sulfate (Fe 2 (SO 4 ) 3 ), polyaluminum chloride, aluminum sulfate and the like can be used, and the addition amount thereof is 10 to 1000 mg / L with respect to the raw water.
It is preferably (liter).
【００１５】砂は、粒径２０〜２５０μｍのものが好ま
しい。本発明においては、後述の沈殿槽４のスラッジブ
ランケット１０の下部から引き抜いた、砂を多量に含む
汚泥が第１攪拌槽２に循環されると共に、スラッジブラ
ンケット１０の上部（又は中部）から引き抜いた汚泥か
らサイクロン９で分離回収された砂が返送されること
で、砂が系内を循環使用される。従って、砂は、この循
環使用される砂を含めて原水に対して１０００〜１００
００ｍｇ／Ｌの割合となるようにするのが好ましく、装
置が安定に連続運転されている際には、通常の場合、原
水に対して１〜１００ｍｇ／Ｌ程度の砂を連続的又は間
欠的に系外から補給する程度で十分である。The sand preferably has a particle size of 20 to 250 μm. In the present invention, the sludge containing a large amount of sand extracted from the lower part of the sludge blanket 10 in the settling tank 4 described later is circulated in the first stirring tank 2 and extracted from the upper part (or middle part) of the sludge blanket 10. By returning the sand separated and collected by the cyclone 9 from the sludge, the sand is circulated in the system. Therefore, the amount of sand is 1000 to 100 relative to the raw water, including the sand that is recycled.
It is preferable that the ratio is 00 mg / L, and when the apparatus is operated stably and continuously, normally, about 1 to 100 mg / L of sand is continuously or intermittently added to the raw water. It is enough to supply from outside the system.
【００１６】この第１攪拌槽２では、後述の沈殿槽４の
スラッジブランケットの下部から循環される汚泥によ
り、良好な凝集効果を得ることができる。In this first stirring tank 2, a good flocculating effect can be obtained by the sludge circulated from the lower part of the sludge blanket of the sedimentation tank 4 described later.
【００１７】原水に無機凝集剤及び砂を添加して凝集処
理した後は、第２攪拌槽３において、高分子凝集剤を添
加して凝集処理し、更に粒径が大きく強固なフロックを
形成させる。高分子凝集剤としては、アニオン性高分子
凝集剤（アニオンポリマー）又は両性高分子凝集剤（両
性ポリマー）を用いることができる。After the inorganic flocculant and sand are added to the raw water to perform the flocculation treatment, in the second stirring tank 3, the polymer flocculant is added and the flocculation treatment is performed to form a strong floc having a large particle size. . As the polymer coagulant, an anionic polymer coagulant (anionic polymer) or an amphoteric polymer coagulant (amphoteric polymer) can be used.
【００１８】アニオンポリマーとしては、特に限定され
ず、例えばポリアクリルアミドの部分加水分解物、ポリ
アクリルアミドとアクリル酸ナトリウムとの共重合物、
アクリルアミドとビニルスルホン酸ナトリウムとの共重
合物、及びアクリルアミドとアクリル酸ナトリウムと２
−アクリルアミド−２−メチルプロパンスルホン酸ナト
リウムとの三元共重合物などが挙げられ、これらの混合
物も使用できる。The anionic polymer is not particularly limited and includes, for example, a partial hydrolyzate of polyacrylamide, a copolymer of polyacrylamide and sodium acrylate,
Copolymer of acrylamide and sodium vinyl sulfonate, and acrylamide and sodium acrylate 2
-Ternary copolymers with sodium acrylamido-2-methylpropanesulfonate and the like can be mentioned, and a mixture thereof can also be used.
【００１９】両性ポリマーとしては、例えばアニオン性
のモノマー成分及びカチオン性のモノマー成分の共重合
体、アニオン性のモノマー成分、カチオン性のモノマー
成分及びノニオン性のモノマー成分の共重合体、或いは
アニオン性のモノマー成分とノニオン性のモノマー成分
の共重合体のマンニッヒ変性物又はホフマン分解物など
を挙げることができる。Examples of the amphoteric polymer include a copolymer of an anionic monomer component and a cationic monomer component, an anionic monomer component, a copolymer of a cationic monomer component and a nonionic monomer component, or an anionic polymer. The Mannich modified product or the Hoffmann degradation product of the copolymer of the monomer component and the nonionic monomer component can be mentioned.
【００２０】アニオン性のモノマー成分としては、例え
ばアクリル酸（ＡＡ）、アクリル酸ナトリウム（Ｎａ
Ａ）、メタクリル酸、メタクリル酸ナトリウムなどを挙
げることができる。カチオン性のモノマー成分として
は、例えばジメチルアミノエチルアクリレート、ジメチ
ルアミノエチルメタアクリレート（ＤＡＭ）、ジメチル
アミノプロピル（メタ）アクリレート、及びそれらの四
級化物などを挙げることができる。四級化物としては、
具体的にはジメチルアミノエチルアクリレートメチルク
ロライド四級化物（ＤＡＡ）などを挙げることができ
る。また、ジメチルアミノプロピルアクリルアミドの塩
酸塩（ＤＡＰＡＡｍ）を用いても良い。ノニオン性のモ
ノマー成分としては、例えばアクリルアミド（ＡＡ
ｍ）、メタアクリルアミド、Ｎ，Ｎ’−ジメチル（メ
タ）アクリルアミドなどを挙げることができる。また、
これらの化合物の共重合体として、具体的にはＤＡＡ／
ＡＡ／ＡＡｍ共重合体、ＤＡＭ／ＡＡ／ＡＡｍ共重合
体、ＤＡＡ／ＤＡＭ／ＡＡ／ＡＡｍ共重合体、ＤＡＰＡ
Ａｍ／ＡＡ／ＡＡｍ共重合体、ＤＡＡ／ＡＡ共重合体、
又はＮａＡ／ＡＡｍ共重合体のマンニッヒ変性物等が好
適である。Examples of the anionic monomer component include acrylic acid (AA) and sodium acrylate (Na).
A), methacrylic acid, sodium methacrylate, etc. can be mentioned. Examples of the cationic monomer component include dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate (DAM), dimethylaminopropyl (meth) acrylate, and quaternized products thereof. As a quaternary compound,
Specific examples thereof include dimethylaminoethyl acrylate methyl chloride quaternary compound (DAA). Alternatively, dimethylaminopropyl acrylamide hydrochloride (DAPAAm) may be used. Examples of the nonionic monomer component include acrylamide (AA
m), methacrylamide, N, N′-dimethyl (meth) acrylamide and the like. Also,
As a copolymer of these compounds, specifically, DAA /
AA / AAm copolymer, DAM / AA / AAm copolymer, DAA / DAM / AA / AAm copolymer, DAPA
Am / AA / AAm copolymer, DAA / AA copolymer,
Alternatively, a Mannich modified product of a NaA / AAm copolymer and the like are preferable.
【００２１】これらの高分子凝集剤は、原水に対して
１．０〜１０．０ｍｇ／Ｌの割合で添加するのが好まし
い。These polymer flocculants are preferably added in a ratio of 1.0 to 10.0 mg / L with respect to the raw water.
【００２２】凝集槽１の凝集処理水は、次いで沈殿槽４
に送給して沈殿処理し、上澄水を処理水として系外へ排
出する。The coagulated water in the coagulation tank 1 is then fed to the settling tank 4
It is sent to the reactor for precipitation treatment, and the supernatant water is discharged as treated water to the outside of the system.
【００２３】本実施例においては、沈殿槽４の回転レー
キ５の下部に沈降したスラッジブランケット１０下部の
汚泥を引き抜いて、第１攪拌槽２に循環する。このスラ
ッジブランケット１０下部の汚泥は、多量の砂を含むも
のであり、この汚泥を第１攪拌槽に循環することで、砂
を有効再利用できると共に、循環した汚泥を核として効
率的な凝集を行うことができ、凝集剤添加量の低減を図
ることができる。In this embodiment, the sludge under the sludge blanket 10 settled under the rotary rake 5 of the settling tank 4 is drawn out and circulated in the first stirring tank 2. The sludge in the lower part of the sludge blanket 10 contains a large amount of sand. By circulating this sludge in the first stirring tank, the sand can be effectively reused, and the sludge circulated can be used as a core for efficient coagulation. It is possible to reduce the amount of coagulant added.
【００２４】また、沈殿槽４の越流堰８を越流した、ス
ラッジブランケット１０上部の汚泥を中央筒体６と越流
堰８との間から汚泥引抜管７を経て引き抜く。このスラ
ッジブランケット１０上部の汚泥は、少量の砂を含む軽
い汚泥であるが、本発明では、この汚泥をサイクロン９
に送り、砂を分離回収し、回収した砂を第１沈殿槽２に
返送して再利用する。サイクロン９で砂を分離除去した
汚泥は、系外へ排出する。Further, the sludge above the sludge blanket 10 overflowing the overflow weir 8 of the settling tank 4 is drawn out between the central tubular body 6 and the overflow weir 8 via the sludge drawing pipe 7. The sludge above the sludge blanket 10 is a light sludge containing a small amount of sand. In the present invention, this sludge is converted into a cyclone 9.
To the first settling tank 2 for reuse. The sludge from which the sand has been separated and removed by the cyclone 9 is discharged to the outside of the system.
【００２５】このように、沈殿槽４のスラッジブランケ
ット１０の上部の汚泥を引き抜くことで、スラッジブラ
ンケット１０上部に軽い汚泥が貯まるのを防止して、沈
殿槽４上部からの汚泥流出を有効に防止することができ
る。By pulling out the sludge above the sludge blanket 10 in the settling tank 4 in this way, it is possible to prevent light sludge from accumulating in the upper part of the sludge blanket 10 and to effectively prevent sludge outflow from the upper part of the settling tank 4. can do.
【００２６】本発明において、沈殿槽下部からの汚泥引
抜量は、原水水量に対して１．０〜１０．０％程度とす
るのが好ましい。In the present invention, the amount of sludge drawn from the lower part of the settling tank is preferably about 1.0 to 10.0% with respect to the amount of raw water.
【００２７】また、沈殿槽のスラッジブランケット上部
（又は中部）からの汚泥引抜量は通水ＬＶや沈殿槽の容
量、形成されるスラッジブランケット層の高さ等により
異なるが、一般には、原水水量に対して１〜１０％程度
とするのが好ましい。The amount of sludge drawn out from the upper part (or middle part) of the sludge blanket in the settling tank differs depending on the water flow LV, the capacity of the settling tank, the height of the sludge blanket layer to be formed, etc. On the other hand, it is preferably about 1 to 10%.
【００２８】図１に示す高速凝集沈殿装置は、本発明の
一実施例であって、本発明はその要旨を超えない限り、
何ら図示の装置に限定されるものではない。The high-speed coagulation-sedimentation apparatus shown in FIG. 1 is one embodiment of the present invention, and as long as the present invention does not exceed its gist,
It is not limited to the illustrated apparatus.
【００２９】例えば、凝集槽は必ずしも２つの攪拌槽を
備える必要はなく、１槽のみでも良いが、図示の如く、
２槽の攪拌槽を設け、第１攪拌槽で無機凝集剤を添加
し、第２攪拌槽で高分子凝集剤を添加して２段凝集処理
を行うことにより凝集効率を高めることができる。For example, the aggregating tank does not necessarily have to have two stirring tanks, and only one tank may be provided.
The aggregation efficiency can be increased by providing two agitation tanks, adding the inorganic aggregating agent in the first agitation tank, and adding the polymer aggregating agent in the second agitation tank to perform the two-stage aggregating treatment.
【００３０】また、砂は第２攪拌槽３に添加しても良
く、第１攪拌槽２及び第２攪拌槽３の両方に添加しても
良い。同様に、沈殿槽４の下部からの循環汚泥は、第２
攪拌槽３に添加しても良く、また、第１攪拌槽２及び第
２攪拌槽３の両方に添加しても良い。The sand may be added to the second stirring tank 3 or both the first stirring tank 2 and the second stirring tank 3. Similarly, the circulating sludge from the bottom of the settling tank 4 is
It may be added to the stirring tank 3 or may be added to both the first stirring tank 2 and the second stirring tank 3.
【００３１】このような本発明の凝集沈殿装置は、特
に、下水や活性汚泥処理水等の有機性ＳＳを含む原水の
凝集沈殿処理に有効であり、このような原水をＬＶ１０
０ｍ／ｈｒまでの高速で効率的に凝集沈殿処理すること
ができる。Such a coagulation-sedimentation apparatus of the present invention is particularly effective for coagulation-sedimentation treatment of raw water containing organic SS such as sewage and activated sludge treated water.
Agglomeration and precipitation treatment can be efficiently performed at high speed up to 0 m / hr.
【００３２】[0032]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。The present invention will be described more specifically below with reference to examples and comparative examples.
【００３３】説明の便宜上、まず、比較例を示す。For convenience of explanation, first, a comparative example will be shown.
【００３４】比較例１ 有機性ＳＳ５０〜１５０ｍｇ／Ｌの排水を図１に示す凝
集沈殿装置で凝集沈殿処理した。ただし、沈殿槽４から
の汚泥の引き抜きは全く行わなかった。Comparative Example 1 Waste water having an organic SS content of 50 to 150 mg / L was subjected to coagulation sedimentation treatment by the coagulation sedimentation apparatus shown in FIG. However, no sludge was drawn from the settling tank 4.
【００３５】第１攪拌槽２の容量は５０Ｌ、第２攪拌槽
３の容量は６０Ｌ、沈殿槽は直径３００ｍｍ、高さ５０
０ｍｍのものを用いた。第１攪拌槽２においてポリ塩化
アルミニウム１５０ｍｇ／Ｌと粒径２０〜２５０μｍの
砂４０００ｍｇ／Ｌを、次いで、第２攪拌槽３において
アニオンポリマー（「クリフロックＰＡ３３１１」栗田
工業（株）商標）３ｍｇ／Ｌをそれぞれ連続的に添加し
た。沈殿槽４の通水ＬＶは４０ｍ／ｈｒとした。The first stirring tank 2 has a capacity of 50 L, the second stirring tank 3 has a capacity of 60 L, and the precipitation tank has a diameter of 300 mm and a height of 50.
The thing of 0 mm was used. 150 mg / L of polyaluminum chloride and 4000 mg / L of sand having a particle size of 20 to 250 μm in the first stirring tank 2, and then 3 mg / L of anionic polymer (“Cliflock PA3311” trademark of Kurita Water Industries Ltd.) in the second stirring tank 3. L was added continuously. The water flow LV of the settling tank 4 was 40 m / hr.
【００３６】その結果、ＳＳ５〜１０ｍｇ／Ｌの水質の
処理水が得られたが、通水３０分後に沈殿槽４からの汚
泥の流出があり、処理を継続することができなかった。As a result, treated water having a water quality of SS 5 to 10 mg / L was obtained, but sludge flowed out from the settling tank 4 after 30 minutes of water flow, and the treatment could not be continued.
【００３７】比較例２ 比較例１において、沈殿槽４の下部のみから、汚泥を、
原水水量に対して５％の割合で引き抜いて第１攪拌槽２
に循環したこと以外は同様に凝集沈殿処理を行ったとこ
ろ（ただし、第１沈殿槽における砂の添加は４０００ｍ
ｇ／Ｌとした。）、ＳＳ４〜８ｍｇ／Ｌの水質の処理水
が得られたが、通水１時間後に沈殿槽４からの汚泥の流
出があり、処理を継続することができなかった。Comparative Example 2 In Comparative Example 1, sludge was supplied only from the lower part of the settling tank 4.
1st stirring tank 2 by drawing 5% of raw water
When the coagulation-sedimentation treatment was performed in the same way except that the sand was added to the first sedimentation tank, the addition of sand was 4000 m.
g / L. ), SS4-8 mg / L of water quality was obtained, but sludge flowed out from the settling tank 4 after 1 hour of water flow, and the treatment could not be continued.
【００３８】比較例３ 比較例２において、沈殿槽下部から引き抜いた汚泥から
サイクロンで砂を分離回収し、この砂を第１攪拌槽に返
送したこと以外は同様に凝集沈殿処理したところ（ただ
し、砂は、分離回収したものに対して、添加量が４００
０ｍｇ／Ｌとなるように適宜補充した。）、ＳＳ４〜８
ｍｇ／Ｌの水質の処理水が得られたが、通水６時間後に
沈殿槽４からの汚泥の流出があり、処理を継続すること
ができなかった。COMPARATIVE EXAMPLE 3 In Comparative Example 2, sand was separated and collected from the sludge drawn from the lower part of the settling tank by a cyclone, and the sand was similarly coagulated and settled except that it was returned to the first stirring tank (however, The amount of sand added to the separated and recovered material is 400
It was replenished appropriately so as to be 0 mg / L. ), SS4-8
Although treated water having a water quality of mg / L was obtained, the treatment could not be continued because the sludge flowed out from the settling tank 4 after 6 hours of water passage.
【００３９】実施例１ 比較例１において、沈殿槽４の下部から原水水量の５％
の割合で汚泥を引き抜き第１攪拌槽２に循環すると共
に、汚泥引抜管７よりスラッジブランケット１０上部の
汚泥をスラッジブランケット１０の高さが２０ｃｍに維
持されるように、即ち、汚泥引抜量が原水水量に対して
７％程度となるように引き抜き、この汚泥からサイクロ
ンで砂を分離回収して第１攪拌槽２に返送したこと以外
は同様にして凝集沈殿処理を行った。Example 1 In Comparative Example 1, 5% of the amount of raw water was measured from the bottom of the settling tank 4.
Of sludge is circulated to the first stirring tank 2 and the sludge on the upper part of the sludge blanket 10 is maintained at a height of 20 cm by the sludge extraction pipe 7, that is, the sludge extraction amount is equal to the raw water. A coagulation-sedimentation process was performed in the same manner except that the sludge was extracted to about 7% with respect to the amount of water, the sand was separated and collected by a cyclone and returned to the first stirring tank 2.
【００４０】なお、砂は、凝集槽における砂の濃度が４
０００ｍｇ／Ｌとなるように適宜補充した。The sand concentration in the coagulation tank is 4
It was replenished appropriately so as to be 000 mg / L.
【００４１】その結果、２４時間の連続通水後において
も水質ＳＳ４〜８ｍｇ／Ｌの高水質処理水を得ることが
できた。As a result, it was possible to obtain high-quality treated water having a water quality of SS 4 to 8 mg / L even after continuous water passage for 24 hours.
【００４２】[0042]
【発明の効果】以上詳述した通り、本発明の凝集沈殿装
置によれば、有機性ＳＳを含む原水であっても、少ない
高分子凝集剤の使用量にて高速で凝集沈殿処理して、高
水質処理水を効率的に得ることができる。As described above in detail, according to the coagulation-sedimentation apparatus of the present invention, even in raw water containing organic SS, the coagulation-sedimentation treatment is performed at a high speed with a small amount of the polymer coagulant used, High quality treated water can be efficiently obtained.
【図１】本発明の凝集沈殿装置の一実施例を示す系統図
である。FIG. 1 is a system diagram showing an embodiment of a coagulating sedimentation device of the present invention.
１ 凝集槽 ２ 第１攪拌槽 ３ 第２攪拌槽 ４ 沈殿槽 ５ 回転レーキ ６ 中央筒体 ７ 汚泥引抜管 ８ 越流堰 ９ サイクロン １０ スラッジブランケット 1 Coagulation tank 2 1st stirring tank 3 2nd stirring tank 4 Precipitation tank 5 Rotating rake 6 Central cylinder 7 Sludge extraction pipe 8 Overflow weir 9 Cyclone 10 Sludge blanket
Claims (1)
する凝集槽と、該凝集槽の流出水が導入されるスラッジ
ブランケット型沈殿槽と、該沈殿槽内のスラッジブラン
ケット下部の汚泥を引き抜いて前記凝集槽に循環する手
段と、該スラッジブランケットの中部又は上部の汚泥を
引き抜いてサイクロンで砂を分離し、分離した砂を前記
凝集槽に返送する手段とを備えてなる凝集沈殿装置。1. A coagulation tank for coagulating by adding a coagulant and sand to raw water, a sludge blanket type sedimentation tank into which the outflow water of the coagulation tank is introduced, and sludge at the bottom of the sludge blanket in the sedimentation tank. A coagulation-sedimentation apparatus comprising: a means for extracting and circulating it in the coagulation tank; and a means for extracting sludge in the middle or upper part of the sludge blanket to separate sand by a cyclone and returning the separated sand to the coagulation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30263795A JP3814853B2 (en) | 1995-11-21 | 1995-11-21 | Coagulation sedimentation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30263795A JP3814853B2 (en) | 1995-11-21 | 1995-11-21 | Coagulation sedimentation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09141006A true JPH09141006A (en) | 1997-06-03 |
| JP3814853B2 JP3814853B2 (en) | 2006-08-30 |
Family
ID=17911387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30263795A Expired - Lifetime JP3814853B2 (en) | 1995-11-21 | 1995-11-21 | Coagulation sedimentation equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3814853B2 (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317217A (en) * | 1999-05-13 | 2000-11-21 | Japan Organo Co Ltd | Flocculating and settling device |
| JP2002085907A (en) * | 2000-09-14 | 2002-03-26 | Japan Organo Co Ltd | Flocculating and settling apparatus |
| KR20020075479A (en) * | 2001-03-24 | 2002-10-05 | 이승희 | apparatus have a rapid deposition of a cohesive reaction for sewage disposal and method |
| JP2002355506A (en) * | 2001-05-31 | 2002-12-10 | Japan Organo Co Ltd | Flocculating and settling equipment |
| WO2006036014A1 (en) * | 2004-09-30 | 2006-04-06 | Nishihara Environment Technology, Inc. | Coagulation-separation apparatus |
| JP2007105596A (en) * | 2005-10-12 | 2007-04-26 | Hymo Corp | Method for preventing outflow of activated sludge |
| JP2007111666A (en) * | 2005-10-24 | 2007-05-10 | Hymo Corp | Method of preventing flow out of activated sludge |
| JP2007253111A (en) * | 2006-03-24 | 2007-10-04 | Daiyanitorikkusu Kk | Water treatment process |
| JP2008086848A (en) * | 2006-09-29 | 2008-04-17 | Kurita Water Ind Ltd | Apparatus and method for treating organic liquid waste |
| JP2009241045A (en) * | 2008-03-31 | 2009-10-22 | Ebara Environmental Plant Co Ltd | Slurry circulation type coagulation and sedimentation treatment device, and its operation method |
| JP2009545432A (en) * | 2006-08-01 | 2009-12-24 | オテヴェ・ソシエテ・アノニム | Method for treating water by ballasted flocculation (aggregation) -sedimentation (precipitation), including continuous measurement of ballast, and system corresponding to the method |
| JP2010075780A (en) * | 2008-09-24 | 2010-04-08 | Japan Organo Co Ltd | Apparatus for treating phosphoric acid-containing water |
| JP2016190210A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械エンバイロメント株式会社 | Flocculation and sedimentation treatment device |
| JP2018143914A (en) * | 2017-03-01 | 2018-09-20 | オルガノ株式会社 | Flocculation sedimentation apparatus and driving method thereof |
| JP2019155282A (en) * | 2018-03-13 | 2019-09-19 | 住友重機械エンバイロメント株式会社 | Solid/liquid separation apparatus |
| CN112939263A (en) * | 2020-12-17 | 2021-06-11 | 西安文理学院 | Device and method for purifying sewage by recycling and activating sludge |
| CN113968606A (en) * | 2021-06-25 | 2022-01-25 | 北京绿恒科技有限公司 | Self-circulation high-density suspended sludge filtering and settling tank and water treatment system |
| WO2022056477A1 (en) * | 2020-09-14 | 2022-03-17 | Evoqua Water Technologies Llc | Sludge withdrawal mechanism for wasting and returning settled sludge from secondary clarifier with granular sludge |
-
1995
- 1995-11-21 JP JP30263795A patent/JP3814853B2/en not_active Expired - Lifetime
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317217A (en) * | 1999-05-13 | 2000-11-21 | Japan Organo Co Ltd | Flocculating and settling device |
| JP2002085907A (en) * | 2000-09-14 | 2002-03-26 | Japan Organo Co Ltd | Flocculating and settling apparatus |
| KR20020075479A (en) * | 2001-03-24 | 2002-10-05 | 이승희 | apparatus have a rapid deposition of a cohesive reaction for sewage disposal and method |
| JP2002355506A (en) * | 2001-05-31 | 2002-12-10 | Japan Organo Co Ltd | Flocculating and settling equipment |
| JP4535419B2 (en) * | 2001-05-31 | 2010-09-01 | オルガノ株式会社 | Coagulation sedimentation equipment |
| WO2006036014A1 (en) * | 2004-09-30 | 2006-04-06 | Nishihara Environment Technology, Inc. | Coagulation-separation apparatus |
| JP2007105596A (en) * | 2005-10-12 | 2007-04-26 | Hymo Corp | Method for preventing outflow of activated sludge |
| JP2007111666A (en) * | 2005-10-24 | 2007-05-10 | Hymo Corp | Method of preventing flow out of activated sludge |
| JP2007253111A (en) * | 2006-03-24 | 2007-10-04 | Daiyanitorikkusu Kk | Water treatment process |
| US8614173B2 (en) | 2006-03-24 | 2013-12-24 | Dia-Nitrix Co., Ltd. | Water treatment method |
| JP2009545432A (en) * | 2006-08-01 | 2009-12-24 | オテヴェ・ソシエテ・アノニム | Method for treating water by ballasted flocculation (aggregation) -sedimentation (precipitation), including continuous measurement of ballast, and system corresponding to the method |
| JP2008086848A (en) * | 2006-09-29 | 2008-04-17 | Kurita Water Ind Ltd | Apparatus and method for treating organic liquid waste |
| JP2009241045A (en) * | 2008-03-31 | 2009-10-22 | Ebara Environmental Plant Co Ltd | Slurry circulation type coagulation and sedimentation treatment device, and its operation method |
| JP2010075780A (en) * | 2008-09-24 | 2010-04-08 | Japan Organo Co Ltd | Apparatus for treating phosphoric acid-containing water |
| JP2016190210A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械エンバイロメント株式会社 | Flocculation and sedimentation treatment device |
| JP2018143914A (en) * | 2017-03-01 | 2018-09-20 | オルガノ株式会社 | Flocculation sedimentation apparatus and driving method thereof |
| JP2019155282A (en) * | 2018-03-13 | 2019-09-19 | 住友重機械エンバイロメント株式会社 | Solid/liquid separation apparatus |
| WO2022056477A1 (en) * | 2020-09-14 | 2022-03-17 | Evoqua Water Technologies Llc | Sludge withdrawal mechanism for wasting and returning settled sludge from secondary clarifier with granular sludge |
| US11883764B2 (en) | 2020-09-14 | 2024-01-30 | Evoqua Water Technologies Llc | Sludge withdrawal mechanism for wasting and returning settled sludge from secondary clarifier with granular sludge |
| CN112939263A (en) * | 2020-12-17 | 2021-06-11 | 西安文理学院 | Device and method for purifying sewage by recycling and activating sludge |
| CN113968606A (en) * | 2021-06-25 | 2022-01-25 | 北京绿恒科技有限公司 | Self-circulation high-density suspended sludge filtering and settling tank and water treatment system |
| CN113968606B (en) * | 2021-06-25 | 2023-07-11 | 北京绿恒科技有限公司 | Self-circulation high-density suspended sludge filtering and settling tank and water treatment system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3814853B2 (en) | 2006-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH09141006A (en) | Flocculating and settling device | |
| US6919031B2 (en) | Method of treating water and wastewater with a ballasted flocculation process and a chemical precipitation process | |
| JP4223870B2 (en) | Water purification method | |
| JP3773169B2 (en) | High speed biological treatment method and apparatus for organic wastewater | |
| JP4073116B2 (en) | Coagulation sedimentation equipment | |
| JP4416144B2 (en) | Coagulation precipitation method and apparatus | |
| JP2006035221A (en) | Method and apparatus for high-speed biological treatment of organic sewage | |
| JP7083274B2 (en) | Water treatment method and water treatment equipment | |
| JP3509169B2 (en) | Dewatering method by sludge granulation and concentration | |
| JP3325689B2 (en) | Treatment method for metal-containing wastewater | |
| JP4446418B2 (en) | Coagulation precipitation system | |
| JP4535419B2 (en) | Coagulation sedimentation equipment | |
| JP4353584B2 (en) | Sand-added coagulating sedimentation equipment | |
| JP3496773B2 (en) | Advanced treatment method and apparatus for organic wastewater | |
| JP2002085907A (en) | Flocculating and settling apparatus | |
| JP2003145168A (en) | Flocculation and solid-liquid separation method for aqueous suspension and apparatus adapted thereto | |
| JP2002113472A (en) | High-speed coagulating sedimentation method for suspended water and its device | |
| JP3870354B2 (en) | Coagulation sedimentation equipment | |
| JP3901392B2 (en) | Coagulation sedimentation equipment | |
| JP2001104712A (en) | Flocculation/precipitation equipment and method of water treatment using the same | |
| JPH02157005A (en) | Treatment apparatus for flocculating settling | |
| JP2019000760A (en) | Method for operation of coagulator and coagulator | |
| JP2002320978A (en) | Method and system ultrahigh speed treatment of phosphorus-containing water | |
| JP2002263660A (en) | Facility for purifying water | |
| JP2002113471A (en) | Method and equipment for coagulating and floating separation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20041026 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060516 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20060529 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090616 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100616 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110616 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120616 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130616 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140616 Year of fee payment: 8 |
|
| EXPY | Cancellation because of completion of term |