JPH10156378A - Method of accelerating wetting of plastic carrier - Google Patents
Method of accelerating wetting of plastic carrierInfo
- Publication number
- JPH10156378A JPH10156378A JP8336260A JP33626096A JPH10156378A JP H10156378 A JPH10156378 A JP H10156378A JP 8336260 A JP8336260 A JP 8336260A JP 33626096 A JP33626096 A JP 33626096A JP H10156378 A JPH10156378 A JP H10156378A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- plastic
- surfactant
- water
- wetting
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として流動床式
生物処理装置に使用される、その表面に微生物を付着さ
せ有機物の生分解・アンモニア態窒素の硝酸化・硝酸態
窒素の還元による脱窒反応等により汚染水を浄化するに
有効なプラスチック製微生物担体の使用方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used for a fluidized-bed biological treatment apparatus, and is used for biodegradation by attaching microorganisms to the surface thereof, biodegradation of organic substances, nitrification of ammonia nitrogen, and denitrification by reduction of nitrate nitrogen. The present invention relates to a method for using a plastic microorganism carrier effective for purifying contaminated water by a reaction or the like.
【０００２】[0002]
【従来の技術】廃水の処理方式の一つとして微生物担体
を槽内に流動させ、資化した微生物を微生物担体と共に
効率よく処理水と分離する流動床式生物処理方式が知ら
れ、該流動床式生物処理方式に用いられる微生物担体と
しては、砂・珊瑚・セラミック等の無機物、各種の架橋
樹脂から成る含水ゲル、ポリエチレン、ポリプロピレ
ン、ポリスチレン、ポリ塩化ビニル、ポリエチレンテレ
フタレート等のプラスチックが知られている。2. Description of the Related Art As one of wastewater treatment methods, there is known a fluidized bed biological treatment method in which a microorganism carrier is fluidized in a tank and assimilated microorganisms are efficiently separated from treated water together with the microorganism carrier. As the microorganism carrier used in the biological treatment system, inorganic substances such as sand, coral, and ceramics, hydrogels composed of various crosslinked resins, and plastics such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyethylene terephthalate are known. .
【０００３】[0003]
【発明が解決しようとする課題】プラスチック製微生物
担体は成形容易であり、固定床用のハニカムタイプある
いは流動床用のペレットタイプ、流動床用の短ストロー
（中空管）タイプなどが市販されている。 しかしなが
ら該プラスチック製微生物担体は使用初期の段階では、
その表面は撥水性であり、特に流動床用の担体の場合に
は表面に気泡が付着して見かけ比重が極端に小さくな
り、曝気槽上部に浮上分離し、生物処理に有効利用され
なくなる欠点がある。 これはプラスチック製微生物担
体の材質そのもの、あるいは離型剤付着の影響、および
両者の複合作用等によるものと考えられ、プラスチック
製微生物担体が水に馴染むまでには時間が経過して表面
状態が親水性に成るのを待つ必要があった。 短ストロ
ー（中空管）タイプの場合は中空管内部に気泡が充満し
易く、上記欠点は更に拡大する。The microbial carrier made of plastic is easy to mold, and a honeycomb type for a fixed bed, a pellet type for a fluidized bed, and a short straw (hollow tube) type for a fluidized bed are commercially available. . However, the plastic microbial carrier is in the early stage of use,
Its surface is water-repellent, especially in the case of a carrier for fluidized beds, where air bubbles adhere to the surface, the apparent specific gravity becomes extremely small, it floats and separates on the upper part of the aeration tank, and it is not used effectively for biological treatment. is there. This is thought to be due to the material itself of the plastic microbial carrier, or the effect of the release agent adhering, and the combined action of the two. I had to wait for sex. In the case of a short straw (hollow tube) type, the inside of the hollow tube is easily filled with air bubbles, and the above-mentioned disadvantages are further enlarged.
【０００４】[0004]
【課題を解決するための手段】本発明者は上記の課題に
鑑み、鋭意検討をおこなった結果、消泡性を有する界面
活性剤をプラスチック製微生物担体表面に接触させる事
により、使用初期よりプラスチック製微生物担体表面を
親水性と成し、水に濡れやすくしうる事を見いだし本発
明を成すに至った。Means for Solving the Problems In view of the above problems, the present inventor has conducted intensive studies. As a result, a surfactant having defoaming properties is brought into contact with the surface of a plastic microbial carrier, so that plastic can be used from the beginning of use. The present inventors have found that the surface of the microorganism-producing carrier can be made hydrophilic and can be easily wetted by water, and the present invention has been accomplished.
【０００５】本発明の請求項１の発明は、消泡作用を持
つ界面活性剤を担体表面に接触させる事により、プラス
チック製微生物担体の初期撥水性を抑制する事を特徴と
するプラスチック担体の濡れ促進方法である。[0005] The invention of claim 1 of the present invention is characterized by suppressing the initial water repellency of a plastic microbial carrier by bringing a surface active agent having a defoaming action into contact with the surface of the carrier. It is a promotion method.
【０００６】本発明の請求項２の発明は、消泡作用を持
つ界面活性剤がポリオキシアルキレン基を有するノニオ
ン性界面活性剤を含有する事を特徴とする請求項１に記
載のプラスチック担体の濡れ促進方法である。According to a second aspect of the present invention, there is provided the plastic carrier according to the first aspect, wherein the surfactant having a defoaming action contains a nonionic surfactant having a polyoxyalkylene group. This is a wetting promotion method.
【０００７】本発明の請求項３の発明は、プラスチック
製微生物担体の材質がポリエチレン、ポリプロピレン、
ポリスチレン、ポリ塩化ビニル、ポリエチレンテレフタ
レートあるいはこれらの誘導体から成る事を特徴とする
請求項１ないし請求項２に記載のプラスチック担体の濡
れ促進方法である。According to a third aspect of the present invention, the material of the plastic microorganism carrier is polyethylene, polypropylene,
3. The method for promoting wetting of a plastic carrier according to claim 1, wherein the method is made of polystyrene, polyvinyl chloride, polyethylene terephthalate or a derivative thereof.
【０００８】本発明の請求項４の発明は、消泡作用を持
つ界面活性剤を担体接触水中に添加する事を特徴とする
請求項１ないし請求項３に記載のプラスチック担体の濡
れ促進方法である。According to a fourth aspect of the present invention, there is provided a method for promoting wetting of a plastic carrier according to any one of the first to third aspects, wherein a surfactant having a defoaming action is added to the carrier contact water. is there.
【０００９】本発明の請求項５の発明は、流動床式生物
処理方法に用いるプラスチック製微生物担体の初期撥水
性を抑制する事を特徴とする請求項１ないし請求項４に
記載のプラスチック担体の濡れ促進方法である。According to a fifth aspect of the present invention, the plastic carrier according to any one of the first to fourth aspects is characterized in that the initial water repellency of the plastic microorganism carrier used in the fluidized bed biological treatment method is suppressed. This is a wetting promotion method.
【００１０】[0010]
【発明の実施の形態】本発明の第一の限定は、消泡作用
を持つ界面活性剤を担体表面に接触させる事により、プ
ラスチック製微生物担体の初期撥水性を抑制する事を特
徴とするプラスチック担体の濡れ促進方法である。本発
明の第二の限定は、消泡作用を持つ界面活性剤がポリオ
キシアルキレン基を有するノニオン性界面活性剤を含有
する事を特徴とする。本発明の第三の限定は、プラスチ
ック製微生物担体の材質がポリエチレン、ポリプロピレ
ン、ポリスチレン、ポリ塩化ビニル、ポリエチレンテレ
フタレートあるいはこれらの誘導体から成る事を特徴と
する。本発明の第四の限定は、消泡作用を持つ界面活性
剤を担体接触水中に添加する事を特徴とする。本発明の
第五の限定は、流動床式生物処理方法に用いるプラスチ
ック製微生物担体の初期撥水性を抑制する事を特徴とす
る。BEST MODE FOR CARRYING OUT THE INVENTION A first limitation of the present invention is to suppress the initial water repellency of a microbial carrier made of plastic by bringing a surfactant having an antifoaming action into contact with the surface of the carrier. This is a method for promoting wetting of the carrier. A second limitation of the present invention is that the surfactant having an antifoaming action contains a nonionic surfactant having a polyoxyalkylene group. A third limitation of the present invention is characterized in that the material of the plastic microorganism carrier is made of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate or a derivative thereof. A fourth limitation of the present invention is that a surfactant having an antifoaming action is added to the carrier contact water. A fifth limitation of the present invention is that the initial water repellency of the microbial carrier made of plastic used in the fluidized bed biological treatment method is suppressed.
【００１１】前述の如く、プラスチック製微生物担体
は、その材質がポリエチレン、ポリプロピレン、ポリス
チレン、ポリ塩化ビニル、ポリエチレンテレフタレート
あるいはこれらの混合物等から成り、撥水性を有する場
合が多い。 撥水性を有する材質あるいは表面に付着し
た離型剤等の作用により、プラスチック製微生物担体は
気泡が付着し易い。 この気泡付着を防止する為にプラ
スチック製微生物担体表面を親水性にするには消泡作用
を持つ界面活性剤を担体表面に吸着ないし付着させれ
ば、界面活性剤の疎水基が担体表面にむき親水基が外部
表面をむく事により担体表面は親水性を呈し、気泡が付
着し難く成る。 通常の界面活性剤は起泡剤として働
き、曝気槽内を泡だらけにし、目的を達成する事ができ
ない。 消泡作用を持つ界面活性剤としてはポリオキシ
アルキレン基を有するノニオン性界面活性剤、たとえば
脂肪酸にエチレンオキシドおよびプロピレンオキシドを
結合させたポリオキシアルキレン脂肪酸エステルあるい
はポリオキシアルキレンノニルフエニルエーテル等を例
示する事ができる。 かかる消泡作用を持つ界面活性剤
をプラスチック製微生物担体表面に接触させるには担体
接触水中に添加する方法がとられる。 例えば該界面活
性剤を含有する水を担体表面にシャワーリングしても良
く、プラスチック製微生物担体を投入する曝気槽内の水
に添加しても良い。水濡れの問題は固定床においても発
生するが流動床担体の場合、気泡付着による担体分離と
言う大きな問題が発生するため本発明の有用性は特に高
い。As described above, plastic microbial carriers are often made of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, or a mixture thereof, and have water repellency. Due to the action of a material having water repellency or a release agent attached to the surface, air bubbles easily adhere to the plastic microorganism carrier. In order to make the surface of the plastic microbial carrier hydrophilic to prevent the adhesion of air bubbles, a surfactant having a defoaming effect is adsorbed or adhered to the surface of the carrier, and the hydrophobic groups of the surfactant are peeled off to the surface of the carrier. When the hydrophilic group exposes the outer surface, the surface of the carrier exhibits hydrophilicity, and it becomes difficult for air bubbles to adhere. Ordinary surfactants act as foaming agents, making the inside of the aeration tank full of foam and failing to achieve its purpose. Examples of the surfactant having an antifoaming action include nonionic surfactants having a polyoxyalkylene group, such as a polyoxyalkylene fatty acid ester obtained by binding ethylene oxide and propylene oxide to a fatty acid, or a polyoxyalkylene nonyl phenyl ether. Can do things. In order to bring the surfactant having such an antifoaming action into contact with the surface of the plastic microorganism carrier, a method of adding the surfactant to the carrier contact water is used. For example, water containing the surfactant may be showered on the surface of the carrier, or may be added to water in an aeration tank into which a plastic microorganism carrier is charged. The problem of water wetting also occurs in a fixed bed, but in the case of a fluidized bed carrier, a great problem of carrier separation due to air bubble adhesion occurs, and the utility of the present invention is particularly high.
【００１２】[0012]
【作用】本発明の骨子はプラスチック製微生物担体表面
の表面張力を調節し、水に濡れやすく撥水性を除去した
状態にするために界面活性剤を担体表面に吸着ないし付
着させる事を特徴とする。 プラスチック製微生物担体
表面は通常撥水性であり界面活性剤の疎水基を吸着しや
すく、疎水基を吸着したプラスチック製微生物担体表面
は界面活性剤の対応極である親水基が表面側にあらわ
れ、担体表面は親水性と成る。 撥水性の担体表面に吸
着しやすい界面活性剤は疎水基の割合が大きな界面活性
剤であり、一般的に消泡剤として市販されている界面活
性剤が担体表面に吸着されやすく、本発明に使用され
る。 カチオン系の界面活性剤は高級アルキルアミン系
が本発明に使用される場合もあるが、一般的に消泡剤と
して市販されている界面活性剤はノニオン性であり本発
明に使用される。 曝気槽においてエアレーションを行
った場合、起泡作用を持つ界面活性剤が使用不能である
事は言うまでもなく、プラスチック製微生物担体表面の
表面張力改質作用を界面活性剤を用いて行う場合は消泡
作用を持つ界面活性剤を用いる事はなかば必然的に要求
される事でもある。The essence of the present invention is characterized in that the surface tension of the surface of the microbial carrier made of plastic is adjusted, and a surfactant is adsorbed or adhered to the surface of the carrier so that the surface is easily wetted with water and water repellency is removed. . The surface of the plastic microbial carrier is usually water repellent and easily adsorbs the hydrophobic groups of the surfactant. The surface of the plastic microbial carrier that has adsorbed the hydrophobic group has hydrophilic groups, which are the corresponding electrodes of the surfactant, on the surface side. The surface becomes hydrophilic. Surfactants that are easily adsorbed on the surface of the water-repellent carrier are surfactants having a large proportion of hydrophobic groups, and surfactants that are generally marketed as defoamers are easily adsorbed on the surface of the carrier. used. As the cationic surfactant, a higher alkylamine-based surfactant may be used in the present invention, but a surfactant commercially available as an antifoaming agent is nonionic and is used in the present invention. Needless to say, surfactants having a foaming action cannot be used when aeration is performed in an aeration tank, and defoaming is performed when the surface tension modifying action on the surface of a plastic microbial carrier is performed using a surfactant. The use of a surfactant having an action is inevitably required.
【００１３】[0013]
【実施例】以下、本発明を実施例により更に具体的に説
明するが、本発明は、その要旨を超えない限り以下の実
施例に限定されるものではない。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention.
【００１４】（比較例）ハイモ株式会社製流動床式生物
処理装置（商品名：粒流バイオシステム）に水道水を満
たし、筒中株式会社製ポリプロピレン製短ストロー（中
空管）タイプの微生物担体（商品名：バイオステージ）
を水に対する容積比１０％量を投入し、エアレーション
を行ったところ、ほぼ全量が水面上に浮遊し、曝気槽内
を循環しなかった。(Comparative Example) Filled with tap water in a fluidized bed biological treatment device (trade name: Granular Biosystem) manufactured by Hymo Co., Ltd., and a short straw (hollow tube) type microbial carrier (made by Tsutsunaka Co., Ltd.) (Product name: Biostage)
Was injected at a volume ratio of 10% with respect to water, and aeration was performed. As a result, almost the entire amount floated on the water surface and did not circulate in the aeration tank.
【００１５】（実施例）前述の曝気槽内の水にハイモ株
式会社製消泡剤〔商品名：ゼロップＮ（内容ポリオキシ
アルキレン脂肪酸エステル８０％ジエチレングリコール
モノメチルエーテル２０％混合物）〕を３ｇ／Ｌの濃度
に添加しエアレーションを行ったところ、全量が水面下
に沈み循環を開始した。 この濡れ促進処理をしたバイ
オステージを取り出し、新規に水道水を満たした曝気槽
内の水中に投入したところ速やかに水に馴染み全量が水
面下に沈み循環を開始した。(Example) 3 g / L of an antifoaming agent (trade name: XEROP N (content of polyoxyalkylene fatty acid ester 80% diethylene glycol monomethyl ether 20%)) in water in the aeration tank was used. When added to the concentration and aerated, the entire amount sank below the surface of the water and started circulating. When the biostage subjected to the wetting promotion treatment was taken out and newly poured into the water in an aeration tank filled with tap water, the biostage immediately became familiar with the water and the whole amount sank below the water surface and started circulation.
【００１６】[0016]
【発明の効果】本発明品は微生物担体表面が親水性とな
り、曝気槽内で浮上分離する事なく、速やかに水に馴染
み全量が水面下に沈み循環を開始した。 これに対し無
処理の微生物担体はほぼ全量が水面上に浮遊し、曝気槽
内を循環しなかった。流動床式生物処理装置における微
生物担体の分散に威力を発揮する事は明らかである。EFFECT OF THE INVENTION The surface of the microorganism carrier of the present invention became hydrophilic, so that it was immediately adapted to water without floating and separating in the aeration tank, and the whole amount sank below the surface of the water and started circulation. On the other hand, almost all of the untreated microorganism carrier floated on the water surface and did not circulate in the aeration tank. It is clear that it is effective in dispersing microbial carriers in a fluidized bed biological treatment apparatus.
Claims (5)
接触させる事により、プラスチック製微生物担体の初期
撥水性を抑制する事を特徴とするプラスチック担体の濡
れ促進方法。1. A method for promoting the wetting of a plastic carrier, which comprises contacting a surface of the carrier with a defoaming surfactant to suppress the initial water repellency of the plastic microorganism carrier.
アルキレン基を有するノニオン性界面活性剤を含有する
事を特徴とする請求項１に記載のプラスチック担体の濡
れ促進方法。2. The method for promoting wetting of a plastic carrier according to claim 1, wherein the surfactant having an antifoaming action contains a nonionic surfactant having a polyoxyalkylene group.
エチレン、ポリプロピレン、ポリスチレン、ポリ塩化ビ
ニル、ポリエチレンテレフタレートあるいはこれらの誘
導体から成る事を特徴とする請求項１ないし請求項２に
記載のプラスチック担体の濡れ促進方法。3. The plastic carrier according to claim 1, wherein the material of the plastic microorganism carrier is made of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate or a derivative thereof. Method.
中に添加する事を特徴とする請求項１ないし請求項３に
記載のプラスチック担体の濡れ促進方法。4. The method for promoting wetting of a plastic carrier according to claim 1, wherein a surfactant having a defoaming action is added to the carrier contact water.
ック製微生物担体の初期撥水性を抑制する事を特徴とす
る請求項１ないし請求項４に記載のプラスチック担体の
濡れ促進方法。5. The method for promoting wetting of a plastic carrier according to claim 1, wherein the initial water repellency of the plastic microorganism carrier used in the fluidized bed biological treatment method is suppressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8336260A JPH10156378A (en) | 1996-12-03 | 1996-12-03 | Method of accelerating wetting of plastic carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8336260A JPH10156378A (en) | 1996-12-03 | 1996-12-03 | Method of accelerating wetting of plastic carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10156378A true JPH10156378A (en) | 1998-06-16 |
Family
ID=18297291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8336260A Pending JPH10156378A (en) | 1996-12-03 | 1996-12-03 | Method of accelerating wetting of plastic carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10156378A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ303464B6 (en) * | 2010-12-08 | 2012-09-26 | DEKONTA, a.s. | Base material for formation of biofilm |
| JP2015192948A (en) * | 2014-03-31 | 2015-11-05 | 株式会社クボタ | Method of preventing floating of filler, method of start-up of water treatment apparatus, water treatment apparatus and digestion tank |
| CN105110470A (en) * | 2015-09-22 | 2015-12-02 | 南京大学 | Heterotopic activation method for aging biological membrane of suspended filler |
| WO2016132881A1 (en) * | 2015-02-16 | 2016-08-25 | 栗田工業株式会社 | Biological treatment tank, method for operating same and method for treating organic wastewater |
| JP2016153118A (en) * | 2015-02-16 | 2016-08-25 | 栗田工業株式会社 | Biological treatment tank, method for operating the tank, and method for treating organic waste water |
-
1996
- 1996-12-03 JP JP8336260A patent/JPH10156378A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ303464B6 (en) * | 2010-12-08 | 2012-09-26 | DEKONTA, a.s. | Base material for formation of biofilm |
| JP2015192948A (en) * | 2014-03-31 | 2015-11-05 | 株式会社クボタ | Method of preventing floating of filler, method of start-up of water treatment apparatus, water treatment apparatus and digestion tank |
| WO2016132881A1 (en) * | 2015-02-16 | 2016-08-25 | 栗田工業株式会社 | Biological treatment tank, method for operating same and method for treating organic wastewater |
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