JP2004121941A

JP2004121941A - Contact material for treating wastewater

Info

Publication number: JP2004121941A
Application number: JP2002287618A
Authority: JP
Inventors: Mikio Kojima; 小嶋　幹雄
Original assignee: HEISEI KIKO KK
Current assignee: HEISEI KIKO KK
Priority date: 2002-09-30
Filing date: 2002-09-30
Publication date: 2004-04-22
Anticipated expiration: 2022-09-30
Also published as: JP4310381B2

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the easiness for installing a large number of contact materials arranged in a wastewater treatment tank to attach and hold sludge. <P>SOLUTION: A large number of the contact materials 1, each of which has a tray-shaped part 2 to which activated sludge is to be attached and held to, are arranged in the wastewater treatment tank in such a state that each of the tray-shaped parts 2 is set so as to leave an interval in the depth direction of the treatment tank. Each of the tray-shaped parts 2 is equipped with the fitting projections 6 protruded from both upper and rear surfaces of the center part of the tray-shaped part 2 and a shaft member 3 externally fitted to the fitting projection 6 on the surface side of the tray-shaped part 2 and the fitting projection 8 on the rear surface side of the other tray-shaped part 2 adjacent to that tray-shaped part 2 to connect and support the tray-shaped part 2 so as to leave a predetermined interval. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、排水中に設置され、有機物などの汚染物質を分解する活性汚泥を保持するための接触材に関するものである。
【０００２】
【従来の技術】
有機物を含有する排水の処理方法として、微生物によって有機物などの汚染物質を分解する方法が多用されていることは周知のとおりである。さらに、その活性汚泥として好気性微生物を使用する酸化処理と、嫌気性微生物を使用する消化処理とが知られている。
【０００３】
前者の酸化処理は、空気との接触を促進する必要があるので、排水中に空気を送り込む曝気槽を使用したり、活性汚泥を付着させた充填材に対して排水を散布もしくは流動させる充填槽を使用するなどの方法が採用されている。これに対して後者の消化処理では、酸素を遮断した状態で有機物の消化を促進する必要があるので、一般には、嫌気性の汚泥を付着・保持させた接触材を処理槽の内部に多数配置し、その処理槽の底部から排水を供給して徐々に水位を上昇させ、その間に接触材に保持されている汚泥に排水中の有機物を捕捉・分解させるようにしている。
【０００４】
この嫌気性消化処理を好気性酸化処理と併用した処理装置の一例が、特開２００１−３４０８９１号公報（特許文献１）や特開２００１−３４０８９２号公報（特許文献２）に記載されており、また消化処理に使用する接触材の例がこれらの文献に記載されている。すなわち、これらの文献に記載された接触材（接触ろ材）は、中心部に貫通孔の形成された円形の平板部分の周縁に、上向きに拡がったテーパ状の周壁部を一体に形成し、かつその平板部分から周壁部に到る長さの六本のスリットを放射状に形成したプラスチック製の皿であって、処理槽の内部に一定間隔で立設されたパイプに、その皿とスペーサとを交互に嵌め込んで処理槽の深さ方向に一定間隔を空けて配置するように構成されている。また、隣接するパイプに保持されている皿同士が、深さ方向に相互に重なり合うように配置されている。これは、接触材に保持されている汚泥と排水との接触を促進するためである。
【０００５】
【特許文献１】
特開２００１−３４０８９１号公報　（段落『００２２』ないし段落『００３０』、図２、図３）
【特許文献２】
特開２００１−３４０８９２号公報　（段落『００２９』ないし段落『００３６』、図２、図３）
【０００６】
【発明が解決しようとする課題】
ところで、上記の嫌気性消化処理などに使用する接触材は、汚泥を可及的に多量に保持できること、処理槽に多量に配置する必要があるので軽量かつ安価であること、耐食性に優れていること、施工性が良好であることなどの特性を備えていることが望ましい。上記の文献に記載された接触材は、比較的単純な形状であってプラスチックによって形成されたものであるから、容易に製造でき、また汚泥の付着・保持量を多くでき、また安価であるなどの利点がある。
【０００７】
しかしながら、その接触材を処理槽内に配置するには、先ず、多数本のパイプを一定間隔に立設する必要があり、またそのパイプに前記皿とスペーサとを交互に嵌め込む必要がある。しかもそのパイプが処理槽の深さ程度の長いものであるから、一つの処理槽に数百個から数千個の皿およびスペーサを配置することを考慮すると、その組み付け作業に多大の労力を要することになり、施工性の点で改良すべき余地があった。
【０００８】
この発明は上記の技術的課題に着目してなされたものであり、嫌気性消化処理などの排水処理に使用される接触材であって、施工性に優れた接触材を提供することを目的とするものである。
【０００９】
【課題を解決するための手段およびその作用】
上記の目的を達成するために、請求項１の発明は、活性汚泥を付着させて保持させる皿状部を備え、その皿状部が処理槽の深さ方向に間隔をあけて多数配列される排水処理用接触材において、前記皿状部の中心部の表裏両面側に突設された嵌合突出部と、前記皿状部の表面側の嵌合突出部とその皿状部に隣接する他の皿状部における裏面側の嵌合突出部に嵌合されてこれらの皿状部を所定の間隔をあけて連結かつ支持する軸部材とを備えていることを特徴とするものである。
【００１０】
したがって請求項１の発明では、複数の皿状部が、その表裏両面側の嵌合突出部に嵌合させた軸部材によって上下方向に連結され、かつ相互の間隔が軸部材の長さ程度に設定される。その結果、処理槽の内部にその深さ方向に一定間隔に配列した状態に皿状部が支持される。すなわち、軸部材と皿状部とを交互に連結するだけで、皿状部を一定間隔に配列し、かつ支持することができ、その施工性が良好になる。
【００１１】
また、請求項２の発明は、請求項１における前記嵌合突出部とこの嵌合突出部に嵌合する前記軸部材とに、軸線方向に対して係合してこれら嵌合突出部と軸部材とを抜け止めする係合部がそれぞれ形成されていることを特徴とする排水処理用接触材である。
【００１２】
したがって請求項２の発明では、上記の請求項１の発明と同様の作用を生じ、これに加えて、皿状部と軸部材とが、それぞれに形成された係合部によって強固かつ確実に連結されるので、皿状部の連結・支持状態を確実なものとすることができる。
【００１３】
【発明の実施の形態】
つぎにこの発明を具体例を参照して説明する。この発明に係る接触材１は、一例として有機排水の嫌気性消化処理に使用され、その形状の一例を図１に示してある。ここに示す接触材１は、皿状部２とこの表裏両面側（上下両面側）に連結される軸部材３とを備えている。
【００１４】
これら皿状部２と軸部材３とは共にプラスチック製であって、その皿状部２は、円形の平板部４の周縁部に、上方向にテーパ状に拡がった形状の周壁部５を一体に形成した形状をなしている。これら平板部４および周壁部５の表面は、汚泥の付着・保持を良好にするために、面粗さを粗くすることが好ましい。
【００１５】
また、その平板部４の中心部には、この発明の嵌合突出部に相当する連結用のボス部６が、表裏両面側に突出して形成されている。このボス部６は、軸部材３を嵌合させるためのものであって、必要な強度を維持できる範囲で比較的短い円筒状に形成されている。そのボス部６の基端部外周面には、軸部材３の抜け止めとして機能するこの発明の係合部に相当する環状の凸部７が形成されている。
【００１６】
さらに、前記平板部４の表裏両面には、ボス部６と同心円状に第２のボス部８が形成されている。この第２のボス部８は、皿状部２と軸部材３との連結強度を確保するためのものであって、ボス部６の基端部の外周を取り囲むように環状に形成されている。そのボス部６の外周面と第２ボス部８の内周面との間隔は、軸部材３の先端部の肉厚程度、もしくは軸部材３の円筒状の先端部が密着嵌合する程度の寸法に設定されている。したがって第２ボス部８の軸長（高さ）は、数ｍｍ程度に短くなっている。
【００１７】
一方、軸部材３は、皿状部２を連結して支持する支持材としての機能と皿状部２の間隔を一定間隔に保持するスペーサとしての機能を併せ持ったものであって、少なくとも両端部が前記ボス部６に密着して嵌合する中空軸状に形成されている。その中空軸状の部分の内面には、前記ボス部６における凸部７と係合して抜け止めとして機能する環状の凹部９が形成されている。したがって軸部材３の端部からその凹部９までの寸法は、前記平板部４の面から前記凸部７までの寸法と一致している。
【００１８】
なお、前記皿状部２における平板部４から周壁部５に掛かる部分に、表裏両面に貫通した複数本（例えば６本）のスリット１０が、平板部４の中心部を中心として放射状に形成されている。このスリット１０は、皿状部２を排水中から引き上げたり、排水中に沈めたりする際に排水を流通させて抵抗を低減させるためのものである。
【００１９】
上記の皿状部２は排水処理槽中に、互いに接触することなく、上下方向および水平方向に重なり合った状態に配列される。その配列状態の一例を図２に示してあり、先ず下側の枠部材１１に軸部材３が立設させられる。なお、隣接する軸部材３としては、互いに長さの異なるものが用いられる。これは、隣接する皿状部２を深さ方向にずらすためである。
【００２０】
その最下部の軸部材３の上端部に、皿状部２のボス部６を嵌め込んで取り付ける。その場合、ボス部６が軸部材３の上端部に密着して嵌合すると同時に、その凸部７が軸部材３の凹部９に係合するので、両者が抜け止めされた状態で強固に連結される。また、軸部材３の先端部が、ボス部６と第２ボス部８との間に挟み込まれた状態になるので、この点でも皿状部２と軸部材３とが確実かつ強固に連結される。
【００２１】
このようにして取り付けられた最下部の皿状部２における上側のボス部６に、第２段目の軸部材３を嵌合させて取り付ける。その場合も、軸部材３の下端部が、ボス部６に密着して嵌合するとともに、軸部材３の下端部がボス部６と第２ボス部８その間に挟み込まれた状態となり、さらにはボス部６の外周面における凸部７に軸部材３の内周面の凹部９が係合するので、軸部材３と皿状部２とが確実かつ強固に連結される。
【００２２】
このようにして皿状部２と軸部材３とを順に積み上げるように連結することにより、複数の皿状部２が所定の間隔を空けて上下方向に連結され、かつ配列される。そして、最上端部の軸部材３を上側の枠部材１２に固定することにより、上下の枠部材１１，１２の間に、複数の皿状部２が直線状に、かつ複数列に並んで保持されるとともに、各皿状部２が上下方向および水平方向に互いに重なった状態に配列される。
【００２３】
したがって上記の接触材１では、皿状部２と軸部材３とを交互に積み上げるように嵌め込んで連結することにより、多数の皿状部２を一定間隔に連結して配列し、かつその配列状態に支持することができる。また、その軸部材３の長さを適宜に設定することにより、皿状部２同士の間隔を適宜に設定することができる。そのため、互いに嵌合する部分の長さが短く、また全体としての部品数が少ないなどのことにより、接触材１を容易に所定の構造体として組み上げることができ、その施工性が良好である。
【００２４】
こうして上下の枠部材１１，１２の間に保持された多数の接触材１が、その枠部材１１，１２と共に所定の処理槽（図示せず）の内部に設置され、その処理槽に注入された排水中で繁殖した汚泥が接触材１に付着・堆積する。また、処理槽に新たに供給された排水中の有機物が、接触材１に保持されている汚泥によって分解され、排水が浄化される。
【００２５】
なお、この発明は上記の具体例に限定されない。すなわち、皿状部２は、要は、水平方向に広がりのある部分を有していればよいので、その形状は円形である必要はなく、矩形などの適宜形状であってよく、また平板部は凹状もしくは凸状に湾曲し、かつ突周壁部はテーパ状以外に、垂直に立ち上がった形状であってもよい。また、この発明における係合部は、要は、皿状部と軸部材との抜け止めとして機能する構造であればよいので、前述した凸部と凹部との一方を皿状部に設け、他方を軸部材に設けた構成であってもよく、あるいは相互に係合する凸部を皿状部と軸部材とのそれぞれに形成した構成であってもよい。さらに、上記の具体例では、軸部材の内部にボス部を嵌め込む構造としたが、これとは反対に、軸部材をボス部の内部に嵌合させるように構成してもよい。したがって軸部材は中空軸である必要はなく、中実軸であってもよい。
【００２６】
【発明の効果】
以上説明したように請求項１の発明によれば、複数の皿状部が、その表裏両面側の嵌合突出部に嵌合させた軸部材によって上下方向に連結され、かつ相互の間隔が軸部材の長さ程度に設定され、その結果、処理槽の内部にその深さ方向に一定間隔に配列した状態に皿状部を支持することができる。すなわち、軸部材と皿状部とを交互に連結するだけで、皿状部を一定間隔に配列し、かつ支持することができ、その施工性を良好なものにすることができる。
【００２７】
また、請求項２の発明によれば、上記の請求項１の発明と同様の効果に加えて、皿状部と軸部材とが、それぞれに形成された係合部によって強固かつ確実に連結されるので、皿状部の連結・支持状態を確実なものとすることができる。
【図面の簡単な説明】
【図１】この発明の一例を分解しかつ一部を断面で示す図である。
【図２】その接触材を上下の枠部材の間に配列した状態を示す部分図である。
【符号の説明】
１…接触材、　２…皿状部、　３…軸部材、　４…平板部、　５…周壁部、　６…ボス部、　７…凸部、　９…凹部。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a contact material for retaining activated sludge that is installed in waste water and decomposes pollutants such as organic substances.
[0002]
[Prior art]
It is well known that a method of decomposing contaminants such as organic substances by microorganisms is frequently used as a method for treating wastewater containing organic substances. Further, an oxidation treatment using an aerobic microorganism as the activated sludge and a digestion treatment using an anaerobic microorganism are known.
[0003]
In the former oxidation treatment, it is necessary to promote contact with air, so use an aeration tank that feeds air into the wastewater, or use a filling tank that sprays or flows the wastewater on the packing material to which activated sludge is attached. And other methods have been adopted. On the other hand, in the latter digestion treatment, it is necessary to promote the digestion of organic substances in a state where oxygen is cut off. Therefore, generally, a large number of contact materials to which anaerobic sludge is attached and held are disposed inside the treatment tank. Then, wastewater is supplied from the bottom of the treatment tank to gradually raise the water level, and meanwhile, the organic matter in the wastewater is captured and decomposed by the sludge held by the contact material.
[0004]
Examples of a processing apparatus using this anaerobic digestion treatment in combination with an aerobic oxidation treatment are described in JP-A-2001-340891 (Patent Document 1) and JP-A-2001-340892 (Patent Document 2). Examples of contact materials used for digestion treatment are described in these documents. That is, the contact material (contact filter material) described in these documents integrally forms a tapered peripheral wall portion that expands upward on the periphery of a circular flat plate portion having a through hole formed in the center, and A plastic dish in which six slits having a length extending from the flat plate portion to the peripheral wall portion are formed radially, and the plate and the spacer are placed on a pipe erected at regular intervals inside the processing tank. The processing tanks are alternately fitted and arranged at regular intervals in the depth direction of the processing tank. Further, the plates held by adjacent pipes are arranged so as to overlap each other in the depth direction. This is to promote the contact between the sludge held by the contact material and the wastewater.
[0005]
[Patent Document 1]
JP 2001-340891 A (paragraphs “0022” to “0030”, FIGS. 2 and 3)
[Patent Document 2]
JP 2001-340892 A (paragraphs “0029” to “0036”, FIGS. 2 and 3)
[0006]
[Problems to be solved by the invention]
By the way, the contact material used for the above-described anaerobic digestion treatment is capable of holding as much sludge as possible, is required to be disposed in a large amount in a treatment tank, is lightweight and inexpensive, and is excellent in corrosion resistance. It is desirable to have such characteristics as good workability. The contact material described in the above-mentioned document has a relatively simple shape and is made of plastic, so that it can be easily manufactured, can attach and hold a large amount of sludge, and is inexpensive. There are advantages.
[0007]
However, in order to arrange the contact material in the treatment tank, first, it is necessary to erect a large number of pipes at regular intervals, and it is necessary to alternately fit the plate and the spacer into the pipes. Moreover, since the pipe is long enough to be about the depth of the processing tank, it takes a lot of labor to assemble it, considering that hundreds to thousands of plates and spacers are arranged in one processing tank. There was room for improvement in terms of workability.
[0008]
The present invention has been made in view of the above technical problem, and an object of the present invention is to provide a contact material used for wastewater treatment such as anaerobic digestion treatment, which is excellent in workability. Is what you do.
[0009]
Means for Solving the Problems and Their Functions
In order to achieve the above object, the invention according to claim 1 includes a dish-shaped portion for attaching and holding activated sludge, and the dish-shaped portion is arranged in a large number at intervals in the depth direction of the treatment tank. In the contact material for drainage treatment, a fitting protrusion protruding from both front and back sides of a center portion of the dish-like portion, a fitting protrusion on the front surface side of the dish-like portion, and a portion adjacent to the dish-like portion are provided. And a shaft member that is fitted to the fitting projection on the back side of the dish-shaped part and connects and supports these dish-shaped parts at a predetermined interval.
[0010]
Therefore, according to the first aspect of the present invention, the plurality of dish-shaped portions are vertically connected by the shaft members fitted to the fitting projections on the front and back surfaces, and the interval between them is approximately equal to the length of the shaft members. Is set. As a result, the dish-shaped portions are supported inside the processing tank in a state of being arranged at regular intervals in the depth direction. That is, merely by alternately connecting the shaft member and the dish-shaped portion, the dish-shaped portions can be arranged and supported at regular intervals, and the workability is improved.
[0011]
According to a second aspect of the present invention, the fitting protrusion and the shaft member fitted to the fitting protrusion are engaged in the axial direction with the fitting protrusion and the shaft. A contact material for wastewater treatment, wherein an engagement portion for preventing the member from coming off is formed.
[0012]
Therefore, according to the second aspect of the invention, the same effect as the first aspect of the invention is produced, and in addition to this, the dish-shaped portion and the shaft member are firmly and reliably connected by the engagement portions formed respectively. Therefore, the connection and support of the dish-shaped portion can be ensured.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described with reference to specific examples. The contact material 1 according to the present invention is used for an anaerobic digestion treatment of organic wastewater as an example, and an example of the shape is shown in FIG. The contact material 1 shown here includes a dish-shaped portion 2 and a shaft member 3 connected to both front and back surfaces (upper and lower surfaces).
[0014]
Both the dish-shaped portion 2 and the shaft member 3 are made of plastic, and the dish-shaped portion 2 is formed by integrating a peripheral wall portion 5 having a shape that is tapered upward in a peripheral portion of a circular flat plate portion 4. It has a shape formed in. The surfaces of the flat plate portion 4 and the peripheral wall portion 5 are preferably roughened in order to improve the adhesion and holding of sludge.
[0015]
At the center of the flat plate portion 4, a connecting boss portion 6 corresponding to the fitting protrusion of the present invention is formed so as to protrude from both front and back surfaces. The boss 6 is for fitting the shaft member 3 and is formed in a relatively short cylindrical shape as long as necessary strength can be maintained. On the outer peripheral surface of the base end portion of the boss portion 6, an annular convex portion 7 corresponding to the engaging portion of the present invention functioning as a stopper for the shaft member 3 is formed.
[0016]
Further, a second boss 8 is formed concentrically with the boss 6 on both the front and back surfaces of the flat plate 4. The second boss portion 8 is for ensuring the connection strength between the dish-shaped portion 2 and the shaft member 3, and is formed in an annular shape so as to surround the outer periphery of the base end portion of the boss portion 6. . The distance between the outer peripheral surface of the boss portion 6 and the inner peripheral surface of the second boss portion 8 is about the thickness of the tip of the shaft member 3 or the extent that the cylindrical tip of the shaft member 3 is tightly fitted. Dimensions are set. Therefore, the axial length (height) of the second boss 8 is reduced to about several mm.
[0017]
On the other hand, the shaft member 3 has both a function as a support member for connecting and supporting the dish-shaped portion 2 and a function as a spacer for keeping the interval between the dish-shaped portions 2 at a constant interval. Are formed in the shape of a hollow shaft that fits closely with the boss portion 6. On the inner surface of the hollow shaft-shaped portion, an annular concave portion 9 is formed which engages with the convex portion 7 of the boss portion 6 and functions as a stopper. Therefore, the dimension from the end of the shaft member 3 to the concave portion 9 thereof matches the dimension from the surface of the flat plate portion 4 to the convex portion 7.
[0018]
A plurality of (for example, six) slits 10 penetrating both the front and back surfaces are formed radially around the center of the flat plate portion 4 in a portion of the dish-shaped portion 2 extending from the flat plate portion 4 to the peripheral wall portion 5. ing. The slit 10 is used to circulate the waste water and reduce the resistance when the dish-shaped portion 2 is pulled up from the waste water or submerged in the waste water.
[0019]
The above-mentioned dish-shaped portions 2 are arranged in the wastewater treatment tank so as to be overlapped in the vertical and horizontal directions without contacting each other. FIG. 2 shows an example of the arrangement state. First, the shaft member 3 is erected on the lower frame member 11. The adjacent shaft members 3 having different lengths are used. This is for shifting the adjacent dish-shaped portion 2 in the depth direction.
[0020]
The boss 6 of the dish 2 is fitted and attached to the upper end of the lowermost shaft member 3. In this case, since the boss portion 6 is fitted in close contact with the upper end portion of the shaft member 3 and the convex portion 7 is engaged with the concave portion 9 of the shaft member 3, the two are firmly connected in a state where they are prevented from coming off. Is done. In addition, since the tip of the shaft member 3 is sandwiched between the boss 6 and the second boss 8, the dish-shaped portion 2 and the shaft 3 are also securely and firmly connected at this point. You.
[0021]
The second-stage shaft member 3 is fitted and attached to the upper boss portion 6 of the lowermost dish-shaped portion 2 thus attached. Also in this case, the lower end of the shaft member 3 is fitted in close contact with the boss portion 6, and the lower end of the shaft member 3 is sandwiched between the boss portion 6 and the second boss portion 8. Since the concave portion 9 on the inner peripheral surface of the shaft member 3 is engaged with the convex portion 7 on the outer peripheral surface of the boss portion 6, the shaft member 3 and the dish-shaped portion 2 are securely and firmly connected.
[0022]
In this way, by connecting the dish-shaped portion 2 and the shaft member 3 so as to be stacked in order, the plurality of dish-shaped portions 2 are vertically connected at predetermined intervals and arranged. By fixing the uppermost shaft member 3 to the upper frame member 12, the plurality of dish-shaped portions 2 are held between the upper and lower frame members 11 and 12 in a straight line and in a plurality of rows. At the same time, the respective dish-shaped portions 2 are arranged in a state of being overlapped with each other in the vertical and horizontal directions.
[0023]
Therefore, in the contact material 1 described above, the dish-shaped portions 2 and the shaft members 3 are fitted and connected so as to be stacked alternately, so that a large number of dish-shaped portions 2 are connected and arranged at regular intervals, and the arrangement thereof is performed. Can be supported in the state. In addition, by appropriately setting the length of the shaft member 3, the distance between the dish-shaped portions 2 can be appropriately set. For this reason, the length of the fitting parts is short and the number of parts as a whole is small, so that the contact material 1 can be easily assembled as a predetermined structure, and the workability is good.
[0024]
A large number of the contact materials 1 held between the upper and lower frame members 11 and 12 are placed inside a predetermined processing tank (not shown) together with the frame members 11 and 12 and injected into the processing tank. Sludge propagated in the drainage adheres and accumulates on the contact material 1. Further, the organic matter in the wastewater newly supplied to the treatment tank is decomposed by the sludge held in the contact material 1, and the wastewater is purified.
[0025]
In addition, this invention is not limited to the said specific example. That is, since the dish-shaped portion 2 only needs to have a portion that extends in the horizontal direction, the shape thereof does not need to be circular, and may be an appropriate shape such as a rectangle. May have a concave or convex shape, and the protruding peripheral wall portion may have a vertically rising shape other than the tapered shape. In addition, since the engagement portion in the present invention is only required to have a structure that functions as a stopper for the dish-shaped portion and the shaft member, one of the above-described projection and the recess is provided in the dish-shaped portion, and the other is provided. May be provided on the shaft member, or a configuration in which mutually engaging convex portions are formed on the dish-shaped portion and the shaft member, respectively. Further, in the specific example described above, the boss portion is fitted inside the shaft member. On the contrary, the shaft member may be fitted inside the boss portion. Therefore, the shaft member does not need to be a hollow shaft, but may be a solid shaft.
[0026]
【The invention's effect】
As described above, according to the first aspect of the present invention, the plurality of dish-shaped portions are vertically connected by the shaft members fitted to the fitting projections on the front and back surfaces, and the distance between the shafts is different from each other. The length is set to about the length of the member. As a result, the dish-shaped portions can be supported inside the processing tank in a state of being arranged at regular intervals in the depth direction. That is, merely by alternately connecting the shaft member and the dish-shaped portion, the dish-shaped portions can be arranged and supported at regular intervals, and the workability thereof can be improved.
[0027]
According to the second aspect of the invention, in addition to the same effects as the first aspect of the invention, the dish-shaped portion and the shaft member are firmly and reliably connected by the engagement portions formed respectively. Therefore, the connection and support of the dish-shaped portion can be ensured.
[Brief description of the drawings]
FIG. 1 is an exploded view of an example of the present invention and a partial cross-sectional view.
FIG. 2 is a partial view showing a state in which the contact members are arranged between upper and lower frame members.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Contact material, 2 ... Dish-shaped part, 3 ... Shaft member, 4 ... Flat plate part, 5 ... Peripheral wall part, 6 ... Boss part, 7 ... Convex part, 9 ... Concave part.

Claims

活性汚泥を付着させて保持させる皿状部を備え、その皿状部が処理槽の深さ方向に間隔をあけて多数配列される排水処理用接触材において、
前記皿状部の中心部の表裏両面側に突設された嵌合突出部と、
前記皿状部の表面側の嵌合突出部とその皿状部に隣接する他の皿状部における裏面側の嵌合突出部に嵌合されてこれらの皿状部を所定の間隔をあけて連結かつ支持する軸部材と
を備えていることを特徴とする排水処理用接触材。In the contact material for wastewater treatment, comprising a dish-shaped portion to which activated sludge is attached and held, and the dish-shaped portion is arranged in large numbers at intervals in the depth direction of the treatment tank,
Fitting protrusions protruding from both sides of the center of the dish-shaped portion,
A fitting projection on the front side of the dish-shaped part and a fitting projection on the back side of another dish-shaped part adjacent to the dish-shaped part are fitted at predetermined intervals. A contact material for wastewater treatment, comprising: a connecting and supporting shaft member.

前記嵌合突出部とこの嵌合突出部に嵌合する前記軸部材とに、軸線方向に対して係合してこれら嵌合突出部と軸部材とを抜け止めする係合部がそれぞれ形成されていることを特徴とする請求項１に記載の排水処理用接触材。An engagement portion is formed on the fitting protrusion and the shaft member fitted to the fitting protrusion to engage in the axial direction to prevent the fitting protrusion and the shaft member from coming off. The contact material for wastewater treatment according to claim 1, wherein