JP3378628B2 - Filtration and denitrification equipment for sewage and filtration and denitrification method - Google Patents

Filtration and denitrification equipment for sewage and filtration and denitrification method

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Publication number
JP3378628B2
JP3378628B2 JP30081993A JP30081993A JP3378628B2 JP 3378628 B2 JP3378628 B2 JP 3378628B2 JP 30081993 A JP30081993 A JP 30081993A JP 30081993 A JP30081993 A JP 30081993A JP 3378628 B2 JP3378628 B2 JP 3378628B2
Authority
JP
Japan
Prior art keywords
water
filtration
denitrification
packed bed
sewage
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
JP30081993A
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Japanese (ja)
Other versions
JPH07124591A (en
Inventor
克之 片岡
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.)
Ebara Corp
Original Assignee
Ebara Corp
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Filing date
Publication date
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Priority to JP30081993A priority Critical patent/JP3378628B2/en
Publication of JPH07124591A publication Critical patent/JPH07124591A/en
Application granted granted Critical
Publication of JP3378628B2 publication Critical patent/JP3378628B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • Y02W10/12

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (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】本発明は各種有機性汚水、特に下
水から有機性SS及び窒素を効果的にろ過除去するろ過
脱窒素装置及びろ過脱窒素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 filter denitrification apparatus and a filter denitrification method for effectively filtering out organic SS and nitrogen from various organic wastewater, especially sewage.

【0002】[0002]

【従来の技術】従来、下水等の汚水からSSをろ過する
技術には、砂、アンスラサイトなどの粒状鉱物をろ材と
する深層ろ過法が公知であるが、このろ過法で下水など
の有機性SSを除去しようとすると、目詰まりが激し
く、実用的でなかった。また、上記粒状鉱物以外のプラ
スチック粒子等の各種粒状固体をろ材とするろ過法も検
討されているが、ろ材粒径を大きくして目詰まりを少な
くすると、SSの除去率が悪化してしまうなどの矛盾点
が生じた。特に、下水などが含む有機性SSは粘着力が
強いので、これら下水などを対象としてSS除去率が高
く、かつ目詰まりが少ないという相反する要求を満足で
きる技術は実用化されていない。また、近年の富栄養化
問題に対処するため、有機性SSのろ過と脱窒素処理を
同一ろ過装置で効果的に行える方法が望まれるが、この
ようなろ過脱窒素装置は十分実用化されていない。
2. Description of the Related Art Conventionally, as a technique for filtering SS from wastewater such as sewage, a deep-layer filtration method using a granular mineral such as sand or anthracite as a filter medium has been known. When trying to remove SS, it was not practical because it was heavily clogged. Further, a filtration method using various granular solids such as plastic particles other than the above-mentioned granular mineral as a filter medium has been studied, but if the filter medium particle size is increased to reduce clogging, the removal rate of SS deteriorates. The contradiction occurred. In particular, since organic SS contained in sewage or the like has a strong adhesive force, a technique which can satisfy the contradictory requirements of high SS removal rate and less clogging for such sewage and the like has not been put into practical use. In order to deal with the eutrophication problem in recent years, a method capable of effectively performing filtration and denitrification treatment of organic SS with the same filtration device is desired, but such a filtration denitrification device has been sufficiently put into practical use. Absent.

【0003】[0003]

【発明が解決しようとする課題】本発明は、有機性SS
のろ過と脱窒素処理を同時に行え、SSの除去及び脱窒
素処理の効率が高く、目詰まりが非常に少ないという相
反する要求を同時に満足することができる汚水の処理装
置を提示するものである。また本発明は、該装置により
目的の処理効果を奏する方法を提示するものである。特
に、粘着性のある有機性SSのろ過と脱窒素処理を同時
に行える汚水のろ過脱窒素装置及びろ過脱窒素方法を提
供することを課題としている。
SUMMARY OF THE INVENTION The present invention relates to an organic SS
The present invention provides a sewage treatment apparatus capable of simultaneously performing filtration and denitrification treatment, and having high efficiency of SS removal and denitrification treatment and simultaneously satisfying contradictory requirements that clogging is extremely small. The present invention also presents a method for achieving the desired processing effect by the device. In particular, it is an object to provide a filter denitrification apparatus and a filter denitrification method for sewage that can simultaneously perform filtration and denitrification of sticky organic SS.

【0004】[0004]

【課題を解決するための手段】上記課題は、以下に示す
本発明の汚水のろ過脱窒素装置及びろ過脱窒素方法によ
って達成される。すなわち上記課題は、 (1) 槽内を多孔性部材により区画して上下多段に処
理室を形成し、さらに最下段の多孔性部材より下方を沈
澱部、最上段の多孔性部材より上方を処理水流出部と
し、前記沈澱部には、汚水の供給装置および洗浄用の気
体の供給装置と、該槽底部に沈澱物排出装置を設け、少
なくとも下段処理室には、水に近い比重の中空筒状粒体
の浮上充填層を設けてSSろ過層とし、その下方に空間
部を形成し、上段処理室には、前記中空筒状粒体より小
さく、かつ水に浮上性の粒体の浮上充填層を設けて脱窒
素層とし、その下方に空間部を形成し、該空間部にNO
X−Nを含む水を供給する含NOX−N水供給装置を設け
たことを特徴とする汚水のろ過脱窒素装置、
Means for Solving the Problems The above problems can be achieved by the filtration denitrification apparatus and filtration denitrification method of the present invention described below. That is, the above problems are as follows: (1) The inside of the tank is divided by porous members to form processing chambers in upper and lower stages, and further, the lower part of the porous member is a precipitation part and the upper part is a porous member. A water outflow section, a sewage supply apparatus and a cleaning gas supply apparatus in the precipitation section, and a sediment discharge apparatus in the bottom of the tank, and at least the lower processing chamber has a hollow cylinder with a specific gravity close to that of water. A floating packing layer of granular particles is provided to form an SS filtration layer, and a space is formed below the SS filtering layer . The upper processing chamber has a floating packing of particles that are smaller than the hollow cylindrical particles and floatable in water. Denitrification with layers
A base layer is formed, and a space portion is formed below the base layer.
Sewage filtration denitrification apparatus characterized in that a containing NO X -N water supply device for supplying water containing X -N,

【0005】及び(2)汚水を、微生物を固定化した粒
体に接触させてろ過ならびに脱窒素を行う方法におい
て、該汚水を水に近い比重の中空筒状粒体の浮上充填層
に上向流で流してSSをろ過したのち、前記浮上充填層
の上段に設けた、前記中空筒状粒体より小さく、かつ水
に浮上性の粒体の浮上充填層に上向流で導入してNO X
−Nを窒素ガスに還元すると共に、上段の浮上充填層に
NOX−Nを含む水を供給しつつ処理することを特徴と
する汚水のろ過脱窒素方法によって達成される。
And (2) in a method of contacting sewage with granules on which microorganisms are immobilized and performing filtration and denitrification, the floating packed bed of hollow cylindrical granules having a specific gravity close to that of sewage.
After flowing SS upwardly to filter SS, the floating packed bed
NO X in provided in the upper, the smaller than the hollow cylindrical granules, and introduced up-flow to the floating packed bed of floating of the granules in water
With reducing -N nitrogen gas, Ru is accomplished by filtration denitrification process wastewater, which comprises processing while supplying water containing NO X -N in the upper floating filling layer.

【0006】かかる充填層、粒体構成及び処理方法とす
ることによってはじめて、粘着性のあるSSを多量に含
有する原水についても、SSの除去効率が高く、目詰ま
りが非常に少ないという相反する要求を同時に満足する
ことができるのである。なおここで、NOX −Nとは硝
酸態窒素NO3 −N、亜硝酸態窒素NO2 −Nを総称す
るものとする。また、多孔性通水部材は、ろ床の横断全
面にパンチングプレート、グレーチング(格子)やネッ
ト等であって、上下両層の充填ろ材を混合させないよう
にする部材である。更に、気体の供給装置は前記汚水の
処理時には停止しても、微弱に含酸素気体を散気して、
好気的脱窒素処理を行っても良い。勿論無酸素気体の散
気を妨げるものではない。
Only by adopting such a packed bed, a granular structure and a treatment method, the conflicting requirements that the SS removal efficiency is high and the clogging is extremely small even in the case of raw water containing a large amount of sticky SS. Can be satisfied at the same time. Here, NO X -N is a generic term for nitrate nitrogen NO 3 -N and nitrite nitrogen NO 2 -N. Further, the porous water-permeable member is a member such as a punching plate, a grating (net), a net, etc. on the entire cross-section of the filter bed so as not to mix the upper and lower layers of the filled filter medium. Furthermore, even if the gas supply device is stopped during the treatment of the wastewater, it slightly diffuses the oxygen-containing gas,
You may perform aerobic denitrification processing. Of course, it does not prevent the diffusion of oxygen-free gas.

【0007】[0007]

【0008】(具体的構成例)本発明のろ過脱窒素装置
を図1に示した。以下に図1を参照しながら、本発明の
構成例を説明し、その後作用について記述するが、以下
の構成例及び作用の説明は本発明を制限するものではな
い。
(Specific Configuration Example) FIG. 1 shows a filter denitrification apparatus of the present invention. Hereinafter, a configuration example of the present invention will be described with reference to FIG. 1 and then an operation will be described, but the following configuration example and description of the operation do not limit the present invention.

【0009】図1において、本発明のろ過脱窒素装置は
上下2段より構成される例を示している。本ろ過脱窒素
装置1は下段よりいずれも透水性の多孔性通水部材3、
多孔性通水部材4及び多孔性通水部材2により沈殿部
C、処理室D、処理室E及び処理水流出部Fに隔離さ
れ、処理室Dにはリング状の中空筒粒体Aが充填されて
いて充填層aを形成し、処理室Eには中空筒粒体Aより
粒径の小さな浮上性の発泡ポリスチロール等の粒体に脱
窒素菌を付着させた粒体Bが充填されていて充填層bを
形成している。充填層aの粒体を浮上性のものとするこ
とは極めて重要であり、もし水に沈む素材を用いると充
填層aの洗浄は著しく面倒になる。
FIG. 1 shows an example in which the filter denitrification device of the present invention is composed of two upper and lower stages. The present filtration denitrification apparatus 1 has a porous water-permeable member 3 that is water-permeable from the bottom,
The porous water-passing member 4 and the porous water-passing member 2 separate the sedimentation portion C, the treatment chamber D, the treatment chamber E, and the treated water outflow portion F, and the treatment chamber D is filled with a ring-shaped hollow cylindrical particle A. To form a packed bed a, and the processing chamber E is filled with particles B such as buoyant expanded polystyrene having a smaller particle size than the hollow cylindrical particles A and having denitrifying bacteria attached to the particles. To form the filling layer b. It is extremely important to make the particles of the packed bed a floatable, and if a material that sinks in water is used, cleaning of the packed bed a becomes extremely troublesome.

【0010】各多孔性通水部材の目びらきについては、
多孔性通水部材2は粒体Bの粒径より小さいものが設け
られ、また多孔性通水部材3は粒体Aの粒径より小さい
ものが設けられ、多孔性通水部材4については少なくと
も粒体Aの粒径より小さければ良いが、さらに粒体Bの
粒径より小さいことが望ましい。このように構成するこ
とにより、沈殿部Cと処理室Dの間の多孔性通水部材3
は粒体Aの落下を阻止することができ、処理室Dと処理
室Eの間の多孔性通水部材4及び処理室Eと流出部Fの
間の多孔性通水部材2は粒体Bの落下及び浮上流出を阻
止する。また多孔性通水部材4によって充填層bと充填
層aの粒体Aの混合を阻止することができる。
With respect to the eyes of each porous water-permeable member,
The porous water-permeable member 2 is provided with a particle size smaller than that of the granules B, the porous water-permeable member 3 is provided with a particle size smaller than that of the granules A, and at least the porous water-permeable member 4 is provided. The particle size may be smaller than the particle size of the granules A, but is preferably smaller than the particle size of the granules B. With this configuration, the porous water-permeable member 3 between the precipitation section C and the processing chamber D is formed.
Can prevent the granules A from falling, and the porous water-permeable member 4 between the processing chamber D and the processing chamber E and the porous water-permeable member 2 between the processing chamber E and the outflow portion F can form the particles B. Prevents the falling and floating of the water. Moreover, the porous water-permeable member 4 can prevent mixing of the packed bed b and the granules A of the packed bed a.

【0011】図1では、多孔性通水部材3と多孔性通水
部材4とで区切られている処理室Dでは粒体Aは該空間
部いっぱいに充填されておらず、しかも粒体Aは比重が
水に近いため、上向流及び/又は浮力によって多孔性通
水部材4の位置にまで浮上し、浮上充填層aを形成した
状態として示されている。また、多孔性通水部材4及び
多孔性通水部材2により区画されている処理室Eでも粒
体Bは該空間部いっぱいに充填されておらず、しかも粒
体Bは浮上性のため充填層の上面は多孔性通水部材2に
接し浮上充填層bを形成している。
In FIG. 1, in the processing chamber D partitioned by the porous water-permeable member 3 and the porous water-permeable member 4, the granules A are not filled in the space, and the granules A are not filled. Since the specific gravity is close to that of water, it is shown as being in a state of being floated up to the position of the porous water-permeable member 4 by the upward flow and / or buoyancy to form the floating filling layer a. Further, even in the processing chamber E partitioned by the porous water-permeable member 4 and the porous water-permeable member 2, the granules B are not filled in the space, and the granules B are buoyant so that the packed bed is filled. The upper surface of is in contact with the porous water-permeable member 2 to form the floating filling layer b.

【0012】ここで、充填層a中に充填される筒状粒状
粒体Aは図1では中空円筒粒体Aとしたが、その形は中
空の角筒状であっても差し支えない。また、筒状粒状体
の筒の両側部に水が通過できる開口部を開けておくと、
下水中のSSが筒の内部に沈殿し、除去され易くなるの
で好適である。
Here, the cylindrical granular particles A packed in the packed bed a are hollow cylindrical granular particles A in FIG. 1, but the shape may be a hollow prismatic shape. In addition, when opening openings through which water can pass on both sides of the cylindrical granular body,
SS in sewage precipitates inside the cylinder and is easily removed, which is preferable.

【0013】充填層aの層厚は1〜3m程度がよく、粒
体Aの粒径は直径が10〜60mm、長さ10〜60m
mの大粒径の粒体を用いることがSS捕捉量を高めるこ
とができ好ましい。また、洗浄し易くするための比重は
1.0に近いものが良く、ポリプロピレン製など公知の
ものが使用できる。充填層bの層厚は1〜1.5m程度
で十分であり、充填層aの層厚≧充填層bの層厚とする
ことが好ましい。充填層bに充填されている浮上性粒状
粒体Bの粒径は0.5〜10mmと小粒径にすることが
好適であり、比重は1.0より小さく水に浮くものとす
ることが本発明の特色であり、ろ床洗浄を空気だけで行
うために不可欠な要因である。例えばその材質としては
発泡ポリスチロール、発泡ポリプロピレン、ポリプロピ
レン、軽量骨材等など公知のものが使用でき、特に表面
が凹凸に富む発泡粒状体が脱窒素菌も効果的に付着させ
ることができるので好ましい。
The thickness of the packed bed a is preferably about 1 to 3 m, and the particle size of the granules A is 10 to 60 mm in diameter and 10 to 60 m in length.
It is preferable to use granules having a large particle size of m because the SS trapping amount can be increased. Further, the specific gravity is preferably close to 1.0 for facilitating washing, and known ones such as polypropylene can be used. The layer thickness of the filling layer b is about 1 to 1.5 m, and it is preferable that the layer thickness of the filling layer a ≧ the layer thickness of the filling layer b. The particle size of the buoyant granular material B packed in the packing layer b is preferably as small as 0.5 to 10 mm, and the specific gravity is less than 1.0 and floats in water. This is a feature of the present invention and is an essential factor for performing filter bed cleaning only with air. For example, as the material thereof, known materials such as expanded polystyrene, expanded polypropylene, polypropylene, lightweight aggregate, etc. can be used, and in particular, expanded granules having a rough surface are preferable because they can also effectively attach denitrifying bacteria. .

【0014】本発明のろ過脱窒素装置1は有機性SSと
NOX −Nを同時に含有する汚水、特に粘着性のある有
機性SSとNOX −Nを同時に含有する下水等の原水を
処理できるところに特徴がある。原水に有機性SSとN
X −Nを含む場合、本発明のろ過脱窒素装置の下部の
供給弁6を備えた汚水の供給装置5より供給され、原水
は装置1内の充填層aと充填層bをその順に上向流とし
て通過し、原水中に含有されているSSと窒素が除去さ
れ、ろ床から越流して処理水流出渠7に流出し、処理水
流出管9を経て処理水として系外に排出される。
[0014] Filtration denitrification apparatus 1 of the present invention can handle raw sewage or the like containing wastewater containing organic SS and NO X -N simultaneously, especially sticky the organic SS and NO X -N simultaneously However, there is a feature. Organic SS and N in raw water
When it contains O X -N, it is supplied from a wastewater supply device 5 equipped with a supply valve 6 at the bottom of the filtration and denitrification device of the present invention, and the raw water is placed on the packed bed a and the packed bed b in the device 1 in that order. SS and nitrogen contained in the raw water are removed as a countercurrent flow, overflow from the filter bed, flow out to the treated water outflow conduit 7, and are discharged as treated water through the treated water outflow pipe 9 to the outside of the system. It

【0015】原水のNOX −N含有量が少ない場合、N
X −N含有水は処理室Eの充填層bの下部に設けられ
ている含NOX −N水供給装置8から供給され、充填層
b内で生物学的に脱窒素される。このような場合の例と
しては、例えば本装置に後続して硝化装置が設置されて
おり、硝化装置から硝化処理水が循環されてくる場合が
挙げられる。
[0015] If NO X -N content of the raw water is small, N
O X -N-containing water is supplied from the containing NO X -N water supply device 8 is provided under the packed bed b of the processing chamber E, it is biologically denitrification in the packed layer b. An example of such a case is, for example, a case where a nitrification apparatus is installed subsequent to the present apparatus and the nitrification-treated water is circulated from the nitrification apparatus.

【0016】処理水流出渠7の水面下には充填層bの粒
体の流出が阻止できる孔径の多孔性通水部材2(パンチ
ングプレート、グレーチング(格子)やネット等で構成
される。)が設けられている。充填層の下の沈殿部Cに
は充填層内を主に空気洗浄するためのブロア10を備え
た空気供給管14を有する散気部材11が設けられてい
る。散気部材11は充填層aの下だけでなく、充填層b
の下に別途設けても良い。ただし、該ブロア10ないし
散気部材11によって通常処理時に微量の含酸素気体を
散気して、本発明のろ過脱窒素装置を好気的脱窒素装置
としても良い。
Below the water surface of the treated water outflow conduit 7, there is provided a porous water-permeable member 2 (consisting of a punching plate, a grating (grid), a net, etc.) having a pore diameter capable of preventing the outflow of the particles of the packed bed b. It is provided. An aeration member 11 having an air supply pipe 14 provided with a blower 10 for mainly cleaning the inside of the packed bed with air is provided in the settling section C below the packed bed. The diffusing member 11 is not only under the packed bed a but also the packed bed b.
It may be separately provided under the. However, a small amount of oxygen-containing gas may be diffused by the blower 10 or the diffusing member 11 during normal processing, and the filtration denitrification device of the present invention may be used as an aerobic denitrification device.

【0017】[0017]

【作用】以下に本発明の作用原理について説明する。下
水等の原水が汚水の供給装置5から本発明のろ過脱窒素
装置1の下部に上向流で流入し、先ず装置1の下部の沈
殿部Cで粗大粒子等の沈降性のよいものが沈殿した後、
次に処理室Dに設けられたポリプロピレン製の中空円筒
状粒体を充填した充填層aに上向流で進入して行く。充
填層aを構成する中空円筒状粒体は粒状体の内部に空隙
を有し、側面は開口しているので、充填層aの空隙率が
95%以上と極めて大きく保てる。従って、充填層aの
粒体Aが多量のSSを捕捉しても空隙率が大きいままで
維持でき、そのためろ過抵抗の増加も極めて少ない。し
かして、中空円筒状粒体が充填されている充填層aを原
水が通過する間に、原水中の10μm以上の粒径のSS
は95%程度が除去されるが、それ以下の粒径の微細な
SSが除去されずに充填層aから流出するので、この微
細なSSを次の充填層bでろ過除去する。
The operation principle of the present invention will be described below. Raw water such as sewage flows from the wastewater supply device 5 into the lower part of the filter denitrification device 1 of the present invention in an upward flow, and first, in the precipitation part C at the lower part of the device 1, those having large sedimentation properties such as coarse particles are precipitated. After doing
Next, it enters into the packed bed a filled with polypropylene hollow cylindrical particles provided in the processing chamber D in an upward flow. The hollow cylindrical granules forming the packed bed a have voids inside the granules and the side surfaces are open, so that the porosity of the packed bed a can be kept extremely high at 95% or more. Therefore, even if a large amount of SS is captured by the granules A of the packed bed a, the porosity can be maintained at a large level, and therefore the increase in filtration resistance is extremely small. Thus, while the raw water passes through the packed bed a filled with the hollow cylindrical particles, the SS having a particle size of 10 μm or more in the raw water is used.
95% is removed, but fine SS having a particle size smaller than that is not removed but flows out from the packed bed a, so this fine SS is removed by filtration in the next packed bed b.

【0018】充填層bを構成する粒体には、比重1.0
より小さく、発泡ポリスチロール、発泡ポリプロピレ
ン、ポリプロピレン等水に浮上するものであり、かつ脱
窒素菌が付着し易く、粒体Aよりも粒径が小さな粒子を
用いることが重要である。脱窒素菌は別途付着させても
良いが、通水を行ううちに自然に充填ろ材上に繁殖す
る。充填層aのを通過した微細なSSは粒径が10μm
以下の微細粒子であるが、粒径の小さなろ材の充填層b
内で、効果的に捕捉される。これは充填層bの空隙のポ
アサイズが小さいため粒径の小さなSSも効果的に除去
できるからである。しかも、粒径の大きなSSは前段の
充填層aでろ過除去されているので、充填層aを通過し
たSSは粒径が小さく、そのSSが粒径の小さな粒体B
が充填されている充填層bを閉塞させることがなく、従
って、充填層bのろ過抵抗の増加も著しく少なくでき
る。もし、充填層aが存在しないと、速やかに充填層b
は閉塞してしまう。
The specific gravity of the particles forming the filling layer b is 1.0.
It is important to use particles that are smaller and that float on water, such as expanded polystyrene, expanded polypropylene, and polypropylene, and that are easily adsorbed by denitrifying bacteria and that have a smaller particle size than granules A. Although the denitrifying bacteria may be attached separately, they naturally propagate on the filling filter medium while water is passed. The fine SS passing through the packed bed a has a particle size of 10 μm.
The following fine particles, but a packing layer b of a filter medium having a small particle size
Effectively captured within. This is because the pore size of the voids in the filling layer b is small, so that SS having a small particle size can be effectively removed. Moreover, since the SS having a large particle size is filtered and removed by the packed bed a in the preceding stage, the SS which has passed through the packed bed a has a small particle size, and the SS has a small particle size B.
The filling layer b filled with is not blocked, and therefore the increase in filtration resistance of the filling layer b can be significantly reduced. If the packed bed a does not exist, the packed bed b is promptly obtained.
Will be blocked.

【0019】以上のような作用により、原水中のSSが
高度に除去され、さらに充填層bのろ材に付着している
脱窒素菌によってNOX −Nが除去される。本発明によ
るろ過脱窒素装置のろ過抵抗の上昇は極めて少なく、ろ
過抵抗の増加により原水の通水ができなくなるという状
況に至る以前に、処理水中のSSの増加によりろ過の限
界を知ることができる。
By the above-mentioned action, SS in the raw water is highly removed, and NO X -N is removed by the denitrifying bacteria adhering to the filter material of the packed bed b. The increase in filtration resistance of the filtration denitrification device according to the present invention is extremely small, and the limit of filtration can be known by the increase of SS in the treated water before the situation in which raw water cannot be passed due to the increase in filtration resistance. .

【0020】このような状態になった時充填層aと充填
層bを次のような方法で洗浄する。すなわち、 供給弁6を閉として、汚水の供給装置5からの原水の
供給を止め、沈殿物排出装置12の弁13を開き、本発
明の装置1内の液をドレンし、水面を多孔性通水部材2
より下に下げる。 沈殿物排出装置12の弁13を閉じ、散気部材11か
ら空気の気泡を激しく吐出させる。 数分間の後に、弁13を再び開け、散気管11から激
しく空気を吐出させながら、ろ材A及びろ材Bを激しく
攪乱しつつ、槽内の水を槽底部の排出管12から全量排
出する。 以上の操作で、ろ層a、b内に捕捉されていたSSの
ほとんどすべてが排出管12から排出される。
When such a state is reached, the packed bed a and the packed bed b are washed by the following method. That is, the supply valve 6 is closed, the supply of raw water from the waste water supply device 5 is stopped, the valve 13 of the sediment discharge device 12 is opened, the liquid in the device 1 of the present invention is drained, and the water surface is made porous. Water member 2
Lower below. The valve 13 of the sediment discharge device 12 is closed, and air bubbles are vigorously discharged from the air diffusing member 11. After a few minutes, the valve 13 is opened again, the air in the diffuser pipe 11 is vigorously discharged, and the filter medium A and the filter medium B are violently disturbed, and the entire amount of water in the tank is discharged from the discharge pipe 12 at the bottom of the tank. By the above operation, almost all of the SS trapped in the filter layers a and b is discharged from the discharge pipe 12.

【0021】このように、本発明のろ過脱窒素装置の洗
浄には空気による攪乱洗浄のみでよく、清澄処理水を多
量に消費する逆洗が不要であるので、著しく合理的であ
る。このような合理的洗浄が可能な理由は、粒体Aに筒
状で大粒径の粒体を使用しているため、空気によって攪
乱して水をドレンするだけでそれまで粒体Aに捕捉され
ていたSSが一緒に容易に排出されるからである。ま
た、粒体Bは水に浮上する粒子を用いているから、空気
攪拌すると水の激しい動きに同伴して、粒体Bの粒子も
激しく運動し、粒体Bに捕捉されていたSSがドレン水
と一緒に系外に排出されるからである。この時、処理室
D及び処理室Eに粒体A及び粒体Bが空間部いっぱいに
充填されていないことにより空気により十分粒体が攪乱
される。
As described above, the filtration denitrification apparatus of the present invention can be cleaned only by disturbing cleaning with air and does not require backwashing that consumes a large amount of clarified water, which is extremely rational. The reason why such a rational cleaning is possible is that the granular particles A are cylindrical and have a large particle size. This is because the SS that has been used is easily discharged together. Further, since the particles B float on the water, the particles of the particles B move violently when the air is stirred, and the particles of the particles B also move violently, causing the SS trapped in the particles B to drain. This is because it is discharged out of the system together with water. At this time, since the processing chamber D and the processing chamber E are not filled with the particles A and the particles B to fill the space, the particles are sufficiently disturbed by the air.

【0022】[0022]

【実施例】以下に、本発明のろ過脱窒素装置を用いて、
原水のSS及びNOX −Nを除去する具体的な実施例を
示す。ただし、本発明の実施例は以下の説明によって限
定されるものではない。
EXAMPLES Below, using the filtration denitrification apparatus of the present invention,
It shows a specific embodiment for removing the SS and NO X -N raw water. However, the embodiments of the present invention are not limited to the following description.

【0023】(実施例1)平均含有SS量が200mg
/リットルである、高SSを含有している下水を原水と
し、下記仕様のろ過脱窒素装置の空間部2の汚水の供給
装置5から装置内に上向流で通水し、かつNO3 −N3
0mg/リットルを含む液を含NOX −N水供給装置8
から(汚水の供給装置5からの)原水の2倍量供給し、
本発明の効果を実証した。装置仕様を表1に示す。
(Example 1) Average content of SS is 200 mg
Sewage containing high SS, which is 1 liter / liter, is used as raw water, and the sewage is supplied from the sewage supply device 5 in the space 2 of the filtration denitrification device having the following specifications into the device in an upward flow and NO 3 N3
NO x -N water supply device 8 containing a liquid containing 0 mg / liter
Supply twice the amount of raw water (from the wastewater supply device 5)
The effect of the present invention was verified. Table 1 shows the device specifications.

【0024】 表1 (処理条件) ろ過脱窒素装置: 空間部Dの高さ : 2.5m 空間部Eの高さ : 1.5m 充填層aの高さ : 2.0m 充填層bの高さ : 1.0m 多孔性通水部材3 : 開口幅20mmスクリーン 多孔性通水部材4及び2: 開口幅0.8mmスクリーン 粒体 A : 直径20mmφ、長さ30mm円筒 ポリプロピレン製 粒体 B : 粒径1mm 発泡ポリスチロール製 [0024]     Table 1 (Processing conditions)       Filtration and denitrification equipment:         Height of space D: 2.5m         Height of space E: 1.5m         Height of packed bed a: 2.0 m         Height of packed bed b: 1.0 m       Porous water-permeable member 3: 20 mm opening width screen       Porous water-passing members 4 and 2: 0.8 mm opening width screen         Granule A: Diameter 20 mmφ, length 30 mm cylinder                                   Made of polypropylene         Granule B: Particle diameter 1 mm                                   Made of expanded polystyrene

【0025】次に処理条件と処理結果を表2に示す。 表2 (処理条件) 通水速度:50m/日(充填層a部)、150m/日
(充填層b部) (処理結果) 処理水NO3 −N含有量: 1.2mg/リットル 処理水SS含有量 : 5.5mg/リットル NO3 −N除去率 : 96% SS除去率 : 97.2% 処理継続時間** : 48〜52時間 **ここで、処理継続時間とは処理水に含まれるSSの
量が10mg/リットルになるまでの時間をいう。
Table 2 shows processing conditions and processing results. Table 2 (Treatment conditions) Water flow rate: 50 m / day (packed bed a part), 150 m / day (packed bed b part) (Treatment result) Treated water NO 3 -N content: 1.2 mg / liter Treated water SS Content: 5.5 mg / liter NO 3 -N removal rate: 96% SS removal rate: 97.2% Treatment duration ** : 48 to 52 hours ** Here, treatment duration is included in treated water It refers to the time until the amount of SS reaches 10 mg / liter.

【0026】充填層a及び充填層bの平均SS捕捉容量
は約15kgSS/(m3 ろ材)であった。これを、ア
ンスラサイト(粒径3mm)を用いた従来のろ過の場合
と比較するとその平均SS捕捉容量は2kgSS/(m
3 ろ材)程度であり、これらの結果を比較すると本発明
のろ過装置の卓越性が明白である。
The average SS trapping capacities of the packed bed a and the packed bed b were about 15 kg SS / (m 3 filter medium). Comparing this with the case of conventional filtration using anthracite (particle size 3 mm), the average SS trapping capacity is 2 kgSS / (m
3 filter media), and when these results are compared, the prominence of the filtration device of the present invention is clear.

【0027】[0027]

【発明の効果】1)ろ過抵抗の増加が著しく少なく、か
つSSの除去効果が極めて高く、かつ効率的にろ過脱窒
素処理できるろ過脱窒素方法である。 2)目詰まり著しく少なく、脱窒素効率の高いろ過脱
窒素装置である。 3)充填層が効果的に洗浄でき、しかも洗浄用水として
処理水を使用する必要がないので、処理水生産効率が高
い。 4)処理継続時間が長く、ろ過速度も大きい。従ってコ
ンパクトな装置ですみ、メンテナンスも容易である。
EFFECTS OF THE INVENTION 1) A filtration denitrification method in which the increase in filtration resistance is extremely small, the effect of removing SS is extremely high, and the filter denitrification treatment can be carried out efficiently. 2) clogging significantly less, a high filtration denitrogenation apparatus of denitrification efficiency. 3) The packed bed can be effectively washed, and since it is not necessary to use treated water as washing water, the treated water production efficiency is high. 4) The treatment duration is long and the filtration rate is high. Therefore, only a compact device is required and maintenance is easy.

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

【図1】本発明のろ過脱窒素装置の1例を用いて本発明
の処理方法のフローを説明するフロー図である。
FIG. 1 is a flow diagram illustrating a flow of a treatment method of the present invention using an example of a filtration denitrification apparatus of the present invention.

【符号の説明】[Explanation of symbols]

1 ろ過脱窒素装置 2 多孔性通水部材 3 多孔性通水部材 4 多孔性通水部材 5 汚水の供給装置 6 供給弁 7 処理水流出渠 8 含NOX −N水供給装置 9 処理水流出管 10 ブロワ 11 散気部材 12 沈殿物排出装置 13 弁 14 空気供給管 a 下段充填層 b 上段充填層 A 粒体 B 粒体 C 沈殿部 D 処理室 E 処理室 F 処理水流出部1 Filtration denitrification device 2 porous water passage member 3 porous water passage member 4 porous water passage member 5 sewage feed devices 6 supply valve 7 treated water outlet sewer 8 including NO X -N water supply device 9 the treated water outlet pipe 10 Blower 11 Diffuser 12 Precipitate Discharge Device 13 Valve 14 Air Supply Pipe a Lower Packed Bed b Upper Packed Bed A Granules B Granules C Settling Section D Treatment Room E Treatment Room F Treated Water Outflow Section

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−113399(JP,A) 特開 平5−253583(JP,A) 特開 平4−66193(JP,A) (58)調査した分野(Int.Cl.7,DB名) C02F 3/28 - 3/40 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-113399 (JP, A) JP-A-5-253583 (JP, A) JP-A-4-66193 (JP, A) (58) Field (Int.Cl. 7 , DB name) C02F 3/28-3/40

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 槽内を多孔性部材により区画して上下多
段に処理室を形成し、さらに最下段の多孔性部材より下
方を沈澱部、最上段の多孔性部材より上方を処理水流出
部とし、前記沈澱部には、汚水の供給装置および洗浄用
の気体の供給装置と、該槽底部に沈澱物排出装置を設
け、少なくとも下段処理室には、水に近い比重の中空筒
状粒体の浮上充填層を設けてSSろ過層とし、その下方
に空間部を形成し、上段処理室には、前記中空筒状粒体
より小さく、かつ水に浮上性の粒体の浮上充填層を設け
て脱窒素層とし、その下方に空間部を形成し、該空間部
にNOX−Nを含む水を供給する含NOX−N水供給装置
を設けたことを特徴とする汚水のろ過脱窒素装置。
1. A processing chamber is formed in upper and lower stages by partitioning the inside of a tank with a porous member, and further, a lower part than the lowermost porous member is a precipitation part, and an upper part is a treated water outflow part. The settling section is provided with a sewage supply device and a cleaning gas supply device, and a sediment discharge device at the bottom of the tank, and at least the lower processing chamber has hollow cylindrical particles with a specific gravity close to that of water. and SS filtration layer provided in the floating filler layer, to form a space thereunder, the upper processing chamber, wherein less than hollow cylindrical granules, and the floating filler layer of the floating of the granules is provided in the water
Te and denitrification layer, forming a space thereunder, sewage filtration denitrification, characterized in that a containing NO X -N water supply device for supplying water containing NO X -N in the space portion apparatus.
【請求項2】 汚水を、微生物を固定化した粒体に接触
させてろ過ならびに脱窒素を行う方法において、該汚水
を水に近い比重の中空筒状粒体の浮上充填層に上向流で
流してSSをろ過したのち、前記浮上充填層の上段に設
けた、前記中空筒状粒体より小さく、かつ水に浮上性の
粒体の浮上充填層に上向流で導入してNO X −Nを窒素
ガスに還元すると共に、上段の浮上充填層にNOX−N
を含む水を供給しつつ処理することを特徴とする汚水の
ろ過脱窒素方法。
2. A method of performing filtration and denitrification by contacting sewage with granules on which microorganisms are immobilized, the sewage being flown upward into a floating packed bed of hollow cylindrical granules having a specific gravity close to that of water.
After flowing to filter SS, set it on the upper stage of the floating packed bed.
The NO x -N is introduced into the floating packed bed of granular particles which are smaller than the hollow cylindrical granular particles and floatable in water in an upward flow to introduce nitrogen into the nitrogen.
While reducing the gas, NO X -N in the upper floating packed bed of
Filtration denitrification how sewage which comprises treating while supplying water containing.
JP30081993A 1993-11-08 1993-11-08 Filtration and denitrification equipment for sewage and filtration and denitrification method Expired - Fee Related JP3378628B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30081993A JP3378628B2 (en) 1993-11-08 1993-11-08 Filtration and denitrification equipment for sewage and filtration and denitrification method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30081993A JP3378628B2 (en) 1993-11-08 1993-11-08 Filtration and denitrification equipment for sewage and filtration and denitrification method

Publications (2)

Publication Number Publication Date
JPH07124591A JPH07124591A (en) 1995-05-16
JP3378628B2 true JP3378628B2 (en) 2003-02-17

Family

ID=17889493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30081993A Expired - Fee Related JP3378628B2 (en) 1993-11-08 1993-11-08 Filtration and denitrification equipment for sewage and filtration and denitrification method

Country Status (1)

Country Link
JP (1) JP3378628B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008212865A (en) * 2007-03-06 2008-09-18 Nihon Suido Consultants Co Ltd Nitration tank

Also Published As

Publication number Publication date
JPH07124591A (en) 1995-05-16

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