JPH0736916B2 - Biofiltration device for organic wastewater - Google Patents

Biofiltration device for organic wastewater

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Publication number
JPH0736916B2
JPH0736916B2 JP2121179A JP12117990A JPH0736916B2 JP H0736916 B2 JPH0736916 B2 JP H0736916B2 JP 2121179 A JP2121179 A JP 2121179A JP 12117990 A JP12117990 A JP 12117990A JP H0736916 B2 JPH0736916 B2 JP H0736916B2
Authority
JP
Japan
Prior art keywords
filter bed
filter
water
bed
granular
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 - Lifetime
Application number
JP2121179A
Other languages
Japanese (ja)
Other versions
JPH0418988A (en
Inventor
克之 片岡
Original Assignee
荏原インフイルコ株式会社
株式会社荏原総合研究所
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Application filed by 荏原インフイルコ株式会社, 株式会社荏原総合研究所 filed Critical 荏原インフイルコ株式会社
Priority to JP2121179A priority Critical patent/JPH0736916B2/en
Publication of JPH0418988A publication Critical patent/JPH0418988A/en
Publication of JPH0736916B2 publication Critical patent/JPH0736916B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

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  • Biological Treatment Of Waste Water (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、下水、各種産業排水、し尿、浄化槽汚泥など
種々の有機性汚水を浄化処理する新規処理装置に関する
ものである。
TECHNICAL FIELD The present invention relates to a novel treatment apparatus for purifying various organic wastewater such as sewage, various industrial wastewater, night soil, and septic tank sludge.

〔従来の技術〕[Conventional technology]

従来より、好気性浸漬濾床装置は公知である。この従来
の装置は、第2図に示すように、槽21の水面下に、アン
スラサイト、粒状活性炭、各種粒状鉱物、プラスチック
粒子など任意の粒状濾材の充填層(浸漬濾床22と呼ぶ)
を設け、該浸漬濾床22内下部に空気散気管23を配設した
ものである。また、このような好気性浸漬濾床装置に
は、沈澱池24、処理水貯層28、洗浄排水貯槽30が付設さ
れている。
Conventionally, an aerobic immersion filter device is known. As shown in FIG. 2, this conventional apparatus has a packed bed of arbitrary granular filter media such as anthracite, granular activated carbon, various granular minerals, and plastic particles (referred to as a submerged filter bed 22) below the water surface of the tank 21.
Is provided, and an air diffuser pipe 23 is arranged in the lower portion inside the submerged filter bed 22. In addition, such an aerobic immersion filter bed is provided with a sedimentation basin 24, a treated water storage layer 28, and a cleaning drainage storage tank 30.

しかして、有機性汚水(原水)は、沈澱池24から原水流
入管25を経て槽21内に流入し、浸漬濾床22を下向流また
は上向流(第2図は下向流の場合)で流過し、粒状濾材
表面の微生物及びブロワー26から散気管23を経て散気さ
れる空気泡と接触し、BODが除去されると共に、原水SS
も濾過除去され、清澄処理水となって処理水流出管27を
経て処理水貯槽28に至る。このような処理を継続するに
つれ、浸漬濾床22内に捕捉されたSSと微生物量の増加に
よって、濾過抵抗が増加して処理を続けることが困難に
なるので、処理水貯槽28内に貯留されている清澄な処理
水をポンプ29によって浸漬濾床22の下部に供給し、浸漬
濾床22を洗浄する。
Then, the organic sewage (raw water) flows from the settling basin 24 into the tank 21 through the raw water inflow pipe 25 and flows downward or upward in the submerged filter bed 22 (Fig. 2 shows the case of downward flow). ) In contact with the microorganisms on the surface of the granular filter medium and the air bubbles diffused from the blower 26 through the diffuser pipe 23, BOD is removed, and the raw water SS
Is also filtered out and becomes clarified treated water, and reaches the treated water storage tank 28 via the treated water outflow pipe 27. As such treatment is continued, the SS and microorganisms trapped in the submerged filter bed 22 increase in filtration resistance, which makes it difficult to continue treatment. The clarified treated water is supplied to the lower part of the submerged filter bed 22 by the pump 29 to wash the submerged filter bed 22.

浸漬濾床22の洗浄排水は、槽21の上部から洗浄排水貯槽
30に至り、この洗浄排水はポンプ31で沈澱池24に供給さ
れてSSが沈降分離され、原水と洗浄排水流量との合計量
が再び浸漬濾床22へ供給される。
The cleaning drainage of the submerged filter bed 22 is stored in the cleaning drainage storage tank from the top of the tank 21.
At 30, the washing wastewater is supplied to the settling basin 24 by the pump 31 to separate the SS by sedimentation, and the total amount of the raw water and the washing wastewater flow rate is again supplied to the immersion filter bed 22.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

しかしながら、第2図の従来装置には次ぎのような大き
な欠点があり、さらに優れた装置及びシステム構成が切
望されている。
However, the conventional device shown in FIG. 2 has the following major drawbacks, and a further excellent device and system configuration is desired.

原水SSが多い場合、第2図のように好気性浸漬濾床装
置の前段に沈澱池を設け、SSの大部分を除去しなければ
ならない。さもないと、好気性浸漬濾床装置の濾床部で
速やかに目詰まり(閉塞)が進行し、好気性浸漬濾床装
置の運転が不可能となり、濾床洗浄頻度も激増する。し
かも、沈澱池の沈降分離速度はせいぜい30m/日程度しか
採れないので、沈澱池の建設費、設置スペースが大きく
なる。
When the raw water SS is large, as shown in Fig. 2, a settling basin must be installed in front of the aerobic immersion filter bed to remove most of the SS. Otherwise, the filter bed portion of the aerobic immersion filter bed device will be rapidly clogged (blocked), the aerobic immersion filter bed device will not be able to operate, and the filter bed cleaning frequency will increase dramatically. Moreover, the sedimentation and separation speed of the sedimentation pond is at most about 30 m / day, which increases the construction cost and installation space of the sedimentation pond.

濾床の洗浄時に濾床容積の2.5倍という多量の洗浄用
水が必要で、洗浄用水として第2図のように好気性浸漬
濾床装置の処理水を多量に使わなければならない。従っ
て、処理水生産効率が低い。
When washing the filter bed, a large amount of washing water, which is 2.5 times the filter bed volume, is required, and a large amount of treated water of the aerobic immersion filter bed apparatus must be used as the washing water as shown in FIG. Therefore, the treated water production efficiency is low.

濾床の洗浄排水を、第2図のように前段の沈澱池に流
入させて処分しているため、好気性浸漬濾床装置には原
水と洗浄排水の合計流量が流入することになる。この結
果、好気性浸漬濾床装置への水量負荷が増加し、好気性
浸漬濾床装置の直径を大きくしなければならなくなって
いる(洗浄頻度が多くなればなるほど好気性浸漬濾床装
置の水量負荷は激増する。)。
As shown in FIG. 2, the cleaning wastewater of the filter bed is discharged into the settling basin in the previous stage and disposed of. Therefore, the total flow rate of the raw water and the cleaning wastewater flows into the aerobic immersion filter bed apparatus. As a result, the amount of water load on the aerobic submerged filter apparatus increases, and the diameter of the aerobic submerged filter apparatus must be increased (the more the cleaning frequency increases, the more the amount of water in the aerobic submerged filter apparatus increases. The load will increase dramatically.)

本発明の課題は、従来装置の前記〜の欠点を完全に
解決し、有機性汚水のSS除去とBOD除去を極めて効率的
に達成できるとともに、好気性浸漬濾床装置の洗浄排水
それ自身を洗浄用水として再生産することが可能な画期
的処理装置を提供することである。
An object of the present invention is to completely solve the above-mentioned disadvantages of the conventional apparatus, and to achieve extremely efficient SS removal and BOD removal of organic wastewater, and also to wash the cleaning drainage itself of the aerobic immersion filter bed apparatus. An object of the present invention is to provide an epoch-making treatment device that can be regenerated as water.

〔課題を解決するための手段〕[Means for Solving the Problems]

本発明は、下記(1)および(2)記載のものであり、
これにより上記課題を解決できる。
The present invention is described in the following (1) and (2),
This can solve the above problem.

(1)比重が1以上の粒状濾材Bからなる下部濾床Bと
該粒状濾材Bの粒径より大きくかつそれより比重が小さ
い立体網目状のスポンジ状粒状片Aからなる上部濾床A
からなる濾床と、該濾床の下部に設けられた空気散気部
と濾過水流出部と、該濾床の上部に設けられた原水供給
部、洗浄排水流出部とからなることを特徴とする有機性
汚水の生物膜濾過装置。
(1) An upper filter bed A composed of a lower filter bed B composed of a granular filter material B having a specific gravity of 1 or more, and a three-dimensional sponge-like granular piece A having a particle size larger than and smaller than the particle size of the granular filter material B.
A filter bed comprising: an air diffuser and a filtered water outlet provided at the bottom of the filter bed; and a raw water supply section and a cleaning drainage outlet provided at the top of the filter bed. A biofilm filter for organic wastewater.

(2)前記生物膜濾過装置の洗浄排水中のSS分を除去す
る凝集沈澱槽と該凝集沈澱処理水の貯槽を設け、該貯槽
内の水を前記固定床の下部に供給する管路を設けたこと
を特徴とする上記(1)記載の有機性汚水の生物膜濾過
装置。
(2) An aggregating and settling tank for removing the SS content in the cleaning wastewater of the biofilm filtration device and a storage tank for the aggregating and settling water are provided, and a pipe line for supplying the water in the storage tank to the lower part of the fixed bed is provided. The biofilm filtration device according to (1) above, characterized in that

本発明は、濾床の構造をサイズおよび比重の異なる濾材
を用い、かつそれぞれ上部と下部に配置することによ
り、上部と下部の生物濾過の特徴を各々発揮できるよう
に機能の異なる役割を分担させることにより従来に比べ
より効率的な処理を行うものである。
INDUSTRIAL APPLICABILITY The present invention uses filter media having different sizes and specific gravities, and arranges them on the upper and lower parts, respectively, so that the different roles of the functions can be shared so that the upper and lower biological filtration characteristics can be exerted respectively. As a result, more efficient processing is performed as compared with the conventional method.

即ち、原水供給部から導入される有機性汚水中の汚水成
分の内、上部濾床Aは、特にSS、BOD等を生物膜が付着
する大粒子の立体網目状のスポンジ状粒状片で、粗濾過
および生物膜処理し、下部濾床Bは、残留する汚水成分
を生物膜が付着する小粒子で濾過および生物膜処理して
上部に比べより確実に除去するものである。
That is, among the sewage components in the organic sewage introduced from the raw water supply part, the upper filter bed A is a sponge-like granular piece of a large particle with a biofilm adhering particularly SS, BOD, etc. After filtration and biofilm treatment, the lower filter bed B removes residual sewage components more reliably than the upper part by filtering and biofilm treatment with small particles to which biofilm adheres.

換言すれば、該上部濾材Aは、濾材の粒径を大きくかつ
濾材を立体網目状のスポンジ状粒状片とすることによ
り、充填密度が低く抑え、間隙と濾材の表面積を増加さ
せることにより、SS捕捉量を、下部濾床Bより大幅に増
大せしめることができる。
In other words, the upper filter medium A has a large particle size of the filter medium and the filter medium is a three-dimensional mesh-like sponge-like granular piece, so that the packing density is suppressed to be low and the SS and the surface area of the filter medium are increased. The trapped amount can be significantly increased as compared with the lower filter bed B.

一方、下部濾床Bでは、濾材粒径を小さくすることによ
り充填密度を上部濾床Aよりも高くし、上部濾床Aより
SS除去及びBODの微生物処理を確実にする機能を有する
ものである。
On the other hand, in the lower filter bed B, the packing density is made higher than that of the upper filter bed A by reducing the particle size of the filter medium,
It has the function of ensuring SS removal and microbial treatment of BOD.

本発明は、上記2層構造の濾床を採用しているため、特
に、洗浄頻度を従来装置に比べ低減できるため、洗浄用
水の量も低減することができ、また、上記(2)記載の
凝集沈澱槽を設けてこれに洗浄排水を導入し、凝集沈澱
処理水を洗浄用水として繰り返し使用することができる
ので、処理効率の向上、洗浄プロセスを含む処理装置全
体のコンパクト化ができると言う効果を有する。
In the present invention, since the filter bed having the above-mentioned two-layer structure is adopted, the frequency of washing can be particularly reduced as compared with the conventional apparatus, so that the amount of washing water can be reduced, and the method described in (2) above Since a coagulation-sedimentation tank is provided and washing wastewater is introduced into it, the coagulation-sedimentation treated water can be repeatedly used as washing water, so that the treatment efficiency can be improved and the entire treatment apparatus including the washing process can be made compact. Have.

本発明に使用される上部濾材Aの粒径は、4〜20mm、好
ましくは、5〜20mmの範囲が望ましい。また、上部濾材
Aの比重は、1.5以下、より好ましくは1.2以下である。
The particle size of the upper filter medium A used in the present invention is in the range of 4 to 20 mm, preferably 5 to 20 mm. The specific gravity of the upper filter medium A is 1.5 or less, more preferably 1.2 or less.

上部濾材Aとして、比重1未満のものを採用した場合、
濾材Aは水に浮上するので上部濾床Aの上部にこれを保
持できる公知の手段、例えば、網、多孔板、細目格子等
を適用するとよい。この場合、上部濾床Aと下部濾床B
との間に間隙があってもよい。即ち、上部濾床Aの構造
は、ある程度流動的であってもよい。また、該上部濾床
Aの保持手段は、該洗浄排水流出部への粒状濾材の流出
を阻止する多孔通水部材を兼ねることもできる。尚、こ
の場合、本発明において、独立に多孔通水部材を該保持
手段に加えて使用できることは言うまでもない。
When a material having a specific gravity of less than 1 is adopted as the upper filter medium A,
Since the filter material A floats on water, it is advisable to apply a known means such as a net, a perforated plate, or a fine grid on the upper part of the upper filter bed A for holding it. In this case, upper filter bed A and lower filter bed B
There may be a gap between and. That is, the structure of the upper filter bed A may be fluid to some extent. Further, the means for holding the upper filter bed A can also serve as a porous water-passing member that prevents the granular filter medium from flowing out to the washing drainage outflow portion. In this case, needless to say, in the present invention, the porous water-permeable member can be independently used in addition to the holding means.

本発明に使用される下部濾材Bの粒径は、1〜4mm、好
ましくは、2〜3mmの範囲が望ましい。また、下部濾床
Bの比重は、1.5〜2.7が望ましい。
The particle size of the lower filter medium B used in the present invention is in the range of 1 to 4 mm, preferably 2 to 3 mm. The specific gravity of the lower filter bed B is preferably 1.5 to 2.7.

下部濾材Bの素材としては、上記条件に加え、微生物が
付着・繁殖し、耐腐食性、強度を備えていれば特に制限
はないが、例示すれば、プラスチック等の各種の樹脂、
セラミックス、石炭、岩石等の鉱物等が挙げられる。上
部濾材Aとしては、立体網目状のスポンジ状粒状片を用
い、粒径、比表面積、空隙率を下部濾材Bより大きくす
る。
The material of the lower filter medium B is not particularly limited as long as it has microorganisms attached / proliferated, and has corrosion resistance and strength in addition to the above-mentioned conditions. For example, various resins such as plastics,
Examples include minerals such as ceramics, coal, and rocks. As the upper filter medium A, a three-dimensional mesh sponge-like granular piece is used, and the particle size, specific surface area, and porosity are made larger than those of the lower filter medium B.

本発明に用いられる微生物としては、特に制限はない
が、例示すればBOD酸化菌、硝化菌、脱窒素菌、酵母等
を挙げることができる。
The microorganism used in the present invention is not particularly limited, but examples thereof include BOD-oxidizing bacteria, nitrifying bacteria, denitrifying bacteria, and yeast.

本発明の固定床における上部濾床Aと下部濾床Bの容積
比は、処理原水の水質にもよるが、SSが100〜200mg/l、
BODが150〜300mg/lの範囲の時、上部濾床A:下部濾床B
=1:2〜4、より好ましくは、1:3の範囲に設定するとよ
い。
The volume ratio of the upper filter bed A and the lower filter bed B in the fixed bed of the present invention depends on the water quality of the treated raw water, but SS is 100 to 200 mg / l,
When BOD is in the range of 150-300 mg / l, upper filter bed A: lower filter bed B
= 1: 2 to 4, and more preferably 1: 3.

また、SSおよびBODの量が上記範囲の原水処理におい
て、本発明装置による洗浄用水の量は、例えば、原水10
00l当たり100lであり、しかもこれをリサイクルできる
ので、生産処理水量/導入原水量の比を0.01〜0.02にで
きる。
Further, in the raw water treatment in which the amount of SS and BOD is in the above range, the amount of cleaning water by the device of the present invention is, for example, 10
Since it is 100 liters per 00 liters and can be recycled, the ratio of production treated water quantity / introduced raw water quantity can be 0.01 to 0.02.

〔発明の実施態様と作用原理〕[Embodiment of the Invention and Working Principle]

本発明の一実施態様を示す第1図を参照しながら、本発
明の構成と作用原理を説明する。
The configuration and principle of operation of the present invention will be described with reference to FIG. 1 showing an embodiment of the present invention.

濾床1に原水(有機性汚水)2が流入し、下向流で上部
濾床Aおよび下部濾床Bからなる濾床(固定床)1を流
下し、空気散気管3から吐出される空気泡と向流接触し
つつ粒状濾材表面の生物膜と接触し、BOD、SSが除去さ
れる。そして、濾床1下部の濾過水流出管4から清澄濾
過水が流出してゆく。
Raw water (organic sewage) 2 flows into the filter bed 1, flows downward through the filter bed (fixed bed) 1 composed of the upper filter bed A and the lower filter bed B in a downward flow, and is discharged from the air diffuser tube 3. BOD and SS are removed by contacting with the biofilm on the surface of the granular filter medium while making countercurrent contact with bubbles. Then, the clear filtered water flows out from the filtered water outflow pipe 4 below the filter bed 1.

本発明の濾床構成には特徴があり、比重1.0以上の粒状
固体(アンスラサイト、粒状活性炭、プラスチック粒
子、シャモットなど)からなる粒状濾材Bによって、下
部濾床Bを構成し、上部濾床Aの濾材として濾床Bの濾
材Bの粒径より粒径が大きく、比重が小さい立体網目状
のスポンジ状粒状片からなる粒状濾材Aを使用すること
が重要である(以下、上部濾床A、下部濾床Bを単に濾
床A、濾床Bと、上部濾材A、下部濾材Bを単に濾材
A、濾材Bと言う)。
The filter bed constitution of the present invention is characterized in that the lower filter bed B is constituted by the granular filter material B made of granular solids (anthracite, granular activated carbon, plastic particles, chamotte, etc.) having a specific gravity of 1.0 or more, and the upper filter bed A It is important to use a granular filter medium A having a particle size larger than that of the filter medium B of the filter bed B and having a small specific gravity as a filter medium of the three-dimensional mesh-like sponge-like granular pieces (hereinafter, referred to as upper filter bed A, The lower filter bed B is simply referred to as filter bed A and filter bed B, and the upper filter medium A and lower filter medium B are simply referred to as filter medium A and filter medium B).

濾床A上部には、濾床の洗浄排水流出管5が設けられ、
洗浄排水貯留槽6に連絡している。貯留槽6内の洗浄排
水はポンプ7によって凝集沈澱槽8に供給され、SSが沈
澱除去される。9は凝集剤注入管である。凝集沈澱処理
水10は処理水貯留槽11を経由し、ポンプ12によって濾床
A,Bの洗浄時に濾床Bの下部に供給管13を通って圧入さ
れる。
On the upper part of the filter bed A, a cleaning drainage outflow pipe 5 for the filter bed is provided,
It communicates with the cleaning drainage storage tank 6. The cleaning wastewater in the storage tank 6 is supplied to the coagulation sedimentation tank 8 by the pump 7, and SS is precipitated and removed. 9 is a coagulant injection tube. The coagulated sediment treated water 10 passes through the treated water storage tank 11 and is filtered by the pump 12
When A and B are washed, they are pressed into the lower part of the filter bed B through the supply pipe 13.

尚、14は濾床洗浄時に濾材A、Bの流出を阻止するネッ
トである。15は、濾材支持板である。
Incidentally, 14 is a net which prevents the filter materials A and B from flowing out at the time of washing the filter bed. Reference numeral 15 is a filter medium support plate.

以上が本発明態様の基本構成である。The above is the basic configuration of the embodiment of the present invention.

次ぎに本発明の作用を説明する。Next, the operation of the present invention will be described.

前述のような処理メカニズムによって、BOD、SSが生物
学的および物理化学的に高度に除去されるが、運転を続
けるに従って、濾抗(濾過抵抗)が増加し、濾床1の水
位Cが上昇してゆく。本発明は、濾床A、Bの2層構成
としているため従来装置よりも濾材のSSの捕捉可能量が
増加し、濾抗の上昇速度は減少する(尚、従来の生物濾
床装置は、例外なく単層の濾床を適用している。)。
Although the BOD and SS are highly biologically and physicochemically removed by the treatment mechanism as described above, the filtration resistance (filtration resistance) increases and the water level C of the filtration bed 1 increases as the operation continues. Do it. Since the present invention has a two-layer structure of filter beds A and B, the amount of SS that can be trapped in the filter medium is increased and the rising speed of the filter is reduced as compared with the conventional device (note that the conventional biological filter device is A single layer filter bed is applied without exception.).

特に、本発明は、濾床Aの濾材として、粒状のスポンジ
を用いることにより、SSの捕捉量と生物膜量を大幅に増
加させることを特徴とする。
In particular, the present invention is characterized by significantly increasing the amount of captured SS and the amount of biofilm by using a granular sponge as the filter medium of the filter bed A.

また、濾材Aとして比重1.0未満の浮上性粒子を適用す
ると逆流洗浄時の濾床Aと濾床Bの濾材の逆転が決して
起こらず、濾材Aの濾材として、大粒径で空間率の大き
く、SS捕捉量が大きいものを使用できるので、非常に好
適である。
Further, when the floating particles having a specific gravity of less than 1.0 are applied as the filter medium A, the filter mediums of the filter bed A and the filter bed B are never reversed during backwashing, and the filter medium of the filter medium A has a large particle size and a large porosity. It is very suitable because a material with a large amount of captured SS can be used.

このように、本発明では濾床Bの上部にSS捕捉量の大き
な軽量で大粒径のスポンジ状粒片からなる濾床Aを設
け、原水2中のSSとBODの粗どりを行ったのち、濾床B
において残留するSSとBODの高度の除去を行うので、全
体として濾抗の上昇を従来装置よりも大幅に減少可能で
あり、この結果、洗浄頻度を減少できる。
As described above, according to the present invention, the filter bed A, which is made of sponge-like particles having a large amount of SS and a large amount of captured particles, is provided on the upper part of the filter bed B, and SS and BOD in the raw water 2 are coarsely crushed. , Filter bed B
Since the residual SS and BOD are removed to a high degree in (1), it is possible to significantly reduce the increase in filtration resistance as compared with the conventional apparatus, and as a result, the cleaning frequency can be reduced.

しかして、濾床水位Cが所定のレベルに達した時点で、
濾床A、Bの洗浄を次ぎのような本発明独自の方法によ
り実施する。
Then, when the filter bed water level C reaches a predetermined level,
The washing of the filter beds A and B is carried out by the method unique to the present invention as follows.

この洗浄方法によれば、清澄濾過水4aを浪費することな
く、濾床A、Bを充分洗浄することができる。
According to this washing method, the filter beds A and B can be sufficiently washed without wasting the clear filtered water 4a.

即ち、原水2の供給を止め、バルブeを閉じ、バルブd
を開け、空気散気管からの吐出空気量を定常時よりも増
加し、濾床A、B内に激しい気液混相攪乱量を起こし、
濾床A、B内に捕捉されていたSSを追い出す。
That is, the supply of raw water 2 is stopped, the valve e is closed, and the valve d
Open, the amount of air discharged from the air diffuser is increased more than in the steady state, causing a violent gas-liquid mixed phase disturbance in filter beds A and B,
The SS trapped in the filter beds A and B is expelled.

所定時間(数分間)この操作を続けたのち、バルブfを
開け、ポンプ12を駆動し、貯槽11内の凝集沈澱処理水を
濾床Bの下部に圧入し、上昇流によって逆洗を行う。こ
の逆洗操作によって、濾床A、B内に残っていたSSは充
分洗い出され、洗浄排水流出管5から洗浄排水貯槽6内
に流入する。
After continuing this operation for a predetermined time (several minutes), the valve f is opened, the pump 12 is driven, the coagulation-sedimentation-treated water in the storage tank 11 is pressed into the lower part of the filter bed B, and backwashing is carried out by an ascending flow. By this backwashing operation, the SS remaining in the filter beds A and B is sufficiently washed out and flows into the washing drainage storage tank 6 through the washing drainage outflow pipe 5.

所定時間(数分間)逆洗を行ったのち、ポンプ12を止
め、バルブd、fを閉じ、バルブeを開け、原水2の供
給を再開し、原水2の浄化処理を始める。
After backwashing for a predetermined time (several minutes), the pump 12 is stopped, the valves d and f are closed, the valve e is opened, the supply of the raw water 2 is restarted, and the purification treatment of the raw water 2 is started.

尚、洗浄排水6aは、前述のように凝集沈澱処理され、清
澄な凝集沈澱処理水10が処理水貯留槽11に貯留され、次
ぎの洗浄工程の洗浄用水となる。
The cleaning wastewater 6a is subjected to the coagulation-sedimentation treatment as described above, and the clear coagulation-sedimentation-treated water 10 is stored in the treated water storage tank 11 and becomes the cleaning water for the next cleaning step.

以上のような独特の洗浄操作により清澄濾過水4aを浪費
することなく、生物濾床A、Bを洗浄できる(従来装置
では、濾過水4の貯留槽を設け、清澄な濾過水を多量に
浪費して、生物濾床を洗浄しなければならなかっ
た。)。
By the unique washing operation as described above, the biological filter beds A and B can be washed without wasting the clear filtered water 4a (in the conventional device, a large amount of clear filtered water is wasted by providing a storage tank for the filtered water 4). And had to wash the biological filter bed.).

〔実施例〕〔Example〕

実施例1 本発明に基づいて下水を対象に浄化処理実験を行った結
果を述べる。従来の生物濾床装置との比較も同時に行っ
た。
Example 1 The result of a purification treatment experiment for sewage based on the present invention will be described. A comparison with a conventional biological filter device was also made at the same time.

第1図に示した本発明装置(カラム直径200φ、高さ4
m)を用いて団地の生下水(SS90〜240mg/l、BOD130〜25
0mg/l)を対象にして、実験を行った。
The device of the present invention shown in FIG. 1 (column diameter 200φ, height 4
m) using the raw sewage (SS90-240mg / l, BOD130-25
The experiment was conducted for 0 mg / l).

実験条件と実験結果を表−1に示した。The experimental conditions and the experimental results are shown in Table-1.

表−1から明らかなように複層生物濾床装置は、従来の
粒状物濾材を用いた単層生物濾床装置よりも同一の濾過
速度(LV=100m/日)において、濾過継続可能時間が10
倍と著しく長くとれ、しかも処理水BOD、SSが従来装置
よりも良好であることが実証された。
As is clear from Table-1, the multi-layer biological filter device has the same filtration speed (LV = 100 m / day) as the continuous filtration time as compared with the conventional single-layer biological filter device using the granular filter medium. Ten
It was proved that the treated water BOD and SS were better than the conventional equipment.

特に、従来装置は生下水を直接LV=100m/日で通水する
と濾過可能時間がたったの3.0hr程度しかとれず、洗浄
排水発生比が、48.4%と膨大になり、全く実用不可能で
あった。
In particular, when the conventional equipment directly feeds raw sewage at LV = 100 m / day, the filterable time is only about 3.0 hr, and the generation rate of cleaning wastewater is 48.4%, which is extremely impractical. It was

実施例2 次に実施例1の表−1には記載しなかったが、本発明に
おける上部濾床を構成する弾性多孔体の最適物性を把握
する実験を行った結果を述べる。
Example 2 Next, although not shown in Table 1 of Example 1, the results of an experiment for ascertaining the optimum physical properties of the elastic porous body constituting the upper filter bed in the present invention will be described.

即ち、表−1のポリウレタンフォームの物性を変え、穴
の径が小さく、穴数も多い(穴数40〜50個/cm、穴径0.2
〜0.3mm)スポンジを上部濾材として採用し、その他の
条件は表−1左欄と同一にして処理実験を行った。その
結果、LV=100m/日で濾過継続可能時間は10〜12hrとな
り、従来装置よりは効果的であったが、実施例1の本発
明よりは劣っていた。また、処理水BODは10〜15mg/l、S
S=8〜10mg/lとなり、実施例1の本発明よりは悪化し
たが、従来装置よりは良好であった。
That is, the physical properties of the polyurethane foam shown in Table-1 are changed, the diameter of the holes is small, and the number of holes is large (the number of holes is 40 to 50 / cm, the hole diameter is 0.2.
.About.0.3 mm) sponge was adopted as the upper filter medium, and the other conditions were the same as those in the left column of Table-1 and the treatment experiment was conducted. As a result, the continuous filtration time was 10 to 12 hr at LV = 100 m / day, which was more effective than the conventional device, but was inferior to the present invention of Example 1. The treated water BOD is 10 to 15 mg / l, S
S = 8 to 10 mg / l, which is worse than the present invention of Example 1, but better than the conventional device.

〔発明の効果〕 原水SS、BODが高い場合でも生物濾床装置の前段に
沈澱池を設ける必要がない。従って、建設コスト、設置
スペースが大幅に節減できる。
[Advantages of the Invention] Even if the raw water SS and BOD are high, it is not necessary to provide a sedimentation tank in front of the biological filter device. Therefore, construction cost and installation space can be significantly reduced.

生物濾床の目詰まり進行が少なく、濾床、洗浄頻度
を減少できる。
The progress of clogging of the biological filter bed is small, and the filter bed and washing frequency can be reduced.

生物濾床装置によって生産された清澄な濾過処理水
を濾床の洗浄用水として浪費する必要がなく、洗浄排水
をそれ自身を清澄化処理し、再度洗浄用水として再利用
する新システム構成としたので、処理水生産効率(処理
水量/原水処理量)が非常に高い。
Since it is not necessary to waste the clear filtered water produced by the biological filter bed as cleaning water for the filter bed, the cleaning drainage itself is clarified and reused as cleaning water again. The treated water production efficiency (treated water amount / raw water treated amount) is very high.

洗浄排水量は原水処理量に比べて当然大幅に少ない
ので、洗浄排水を洗浄用水として再生産する凝集沈澱装
置の設置面積も小さなものですむ。しかも、次ぎの洗浄
工程までの時間(通常10〜20hr)の間に、少量ずつ洗浄
排水を凝集沈澱処理すればよいので凝集沈澱装置の所要
規模は一層小さなものですむ。
Since the amount of washing wastewater is significantly smaller than the amount of raw water treated, the installation area of the coagulating sedimentation device that regenerates the washing wastewater as washing water is also small. In addition, since the washing wastewater may be subjected to coagulation-precipitation treatment little by little during the time until the next cleaning step (usually 10 to 20 hours), the required scale of the coagulation-precipitation apparatus can be further reduced.

洗浄排水の凝集沈澱処理用の凝集剤として、高分子
凝集剤を使うことによって、凝集沈澱汚泥をそのまま無
薬注で脱水処理することができる。
By using a polymer coagulant as a coagulant for coagulating sedimentation of washing wastewater, the coagulating sedimentation sludge can be dehydrated as it is without chemical injection.

洗浄排水が原水流量に加算されないので、生物濾床
への水量負荷が大きく軽減される。(従来装置では洗浄
排水を原水に混合させてしまうので、生物濾床への水量
負荷が濾床の洗浄頻度に比例して増加してしまう。) 濾床Aの濾材として粒状のスポンジを用いることによ
り、SSの捕捉量と生物膜量を大幅に増加させることがで
きる。
Since the washing drainage is not added to the raw water flow rate, the water load on the biological filter is greatly reduced. (In the conventional device, the washing waste water is mixed with the raw water, so that the water load on the biological filter bed increases in proportion to the cleaning frequency of the filter bed.) Using a granular sponge as the filter medium of the filter bed A As a result, the amount of captured SS and the amount of biofilm can be significantly increased.

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

第1図は、本発明の一実施例を説明するための図、第2
図は、従来の好気性浸漬濾床装置を説明するための図で
ある。 符号の説明 1:濾床(上部濾床A+下部濾床B) 2:原水(有機性汚水) 3:空気散気管、4:濾過水流出管 5:洗浄排水流出管、6:洗浄排水貯留槽 8:凝集沈澱槽、11:処理水貯留槽
FIG. 1 is a diagram for explaining an embodiment of the present invention, and FIG.
The figure is a figure for demonstrating the conventional aerobic immersion filter bed apparatus. Explanation of code 1: Filter bed (upper filter bed A + lower filter bed B) 2: Raw water (organic wastewater) 3: Air diffuser pipe, 4: Filtered water outflow pipe 5: Wash drainage outflow pipe, 6: Wash drainage storage tank 8: Coagulation sedimentation tank, 11: Treated water storage tank

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】比重が1以上の粒状濾材Bからなる下部濾
床Bと該粒状濾材Bの粒径より大きくかつそれより比重
が小さい立体網目状のスポンジ状粒状片Aからなる上部
濾床Aとからなる濾床と、該濾床の下部に設けられた空
気散気部と濾過水流出部と、該濾床の上部に設けられた
原水供給部、洗浄排水流出部とからなることを特徴とす
る有機性汚水の生物膜濾過装置。
1. An upper filter bed A comprising a lower filter bed B made of granular filter material B having a specific gravity of 1 or more and a three-dimensional sponge-like granular piece A having a specific gravity larger than the particle size of the granular filter material B and smaller than that. A filter bed comprising: a filter bed, an air diffuser and a filtered water outlet provided at a lower portion of the filter bed, and a raw water supply portion and a cleaning drainage outlet provided at an upper portion of the filter bed. A biofilm filter for organic wastewater.
【請求項2】前記生物膜濾過装置の洗浄排水中のSS分を
除去する凝集沈澱槽と該凝集沈澱処理水の貯槽を設け、
該貯槽内の水を前記固定床の下部に供給する管路を設け
たことを特徴とする請求項1記載の有機性汚水の生物膜
濾過装置。
2. A coagulation-sedimentation tank for removing SS in the cleaning wastewater of the biofilm filtration device and a storage tank for the coagulation-sedimentation treated water are provided.
The biofilm filtration device for organic sewage according to claim 1, further comprising a pipe line for supplying water in the storage tank to a lower portion of the fixed bed.
JP2121179A 1990-05-14 1990-05-14 Biofiltration device for organic wastewater Expired - Lifetime JPH0736916B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2121179A JPH0736916B2 (en) 1990-05-14 1990-05-14 Biofiltration device for organic wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2121179A JPH0736916B2 (en) 1990-05-14 1990-05-14 Biofiltration device for organic wastewater

Publications (2)

Publication Number Publication Date
JPH0418988A JPH0418988A (en) 1992-01-23
JPH0736916B2 true JPH0736916B2 (en) 1995-04-26

Family

ID=14804806

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2121179A Expired - Lifetime JPH0736916B2 (en) 1990-05-14 1990-05-14 Biofiltration device for organic wastewater

Country Status (1)

Country Link
JP (1) JPH0736916B2 (en)

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Publication number Priority date Publication date Assignee Title
JP2581636B2 (en) * 1992-09-09 1997-02-12 株式会社東洋製作所 High-concentration organic matter treatment method
JP4921325B2 (en) 2007-03-22 2012-04-25 国立大学法人 東京大学 Electret, electrostatic induction conversion element including the same, and method for manufacturing electret
JP6556419B2 (en) * 2013-09-25 2019-08-07 三菱重工エンジニアリング株式会社 Purification device and purification device backwash method
JP2018008275A (en) * 2017-10-20 2018-01-18 三菱重工業株式会社 Biological membrane filter device, and backwash method of biological membrane filter device
JP7219656B2 (en) * 2019-03-29 2023-02-08 メタウォーター株式会社 Trickling filter type water treatment equipment and method for cleaning the trickling filter type water treatment equipment

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Also Published As

Publication number Publication date
JPH0418988A (en) 1992-01-23

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