JP3414240B2 - Agent and method for suppressing solid-liquid separation failure in activated sludge treatment system - Google Patents
Agent and method for suppressing solid-liquid separation failure in activated sludge treatment systemInfo
- Publication number
- JP3414240B2 JP3414240B2 JP01934598A JP1934598A JP3414240B2 JP 3414240 B2 JP3414240 B2 JP 3414240B2 JP 01934598 A JP01934598 A JP 01934598A JP 1934598 A JP1934598 A JP 1934598A JP 3414240 B2 JP3414240 B2 JP 3414240B2
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- treatment system
- liquid separation
- solid
- sludge treatment
- 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.)
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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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は活性汚泥処理系にお
ける糸状性バルキングによる固液分離障害を抑制するた
めの固液分離障害抑制剤および固液分離障害抑制方法に
関するものである。TECHNICAL FIELD The present invention relates to a solid-liquid separation disorder inhibitor and a solid-liquid separation disorder suppression method for suppressing solid-liquid separation disorder due to filamentous bulking in an activated sludge treatment system.
【０００２】[0002]
【従来の技術】有機性排水の活性汚泥処理法では、排水
を曝気槽において活性汚泥と混合して曝気し、固液分離
槽において汚泥を分離し、分離液を処理水として排出す
る一方、分離した汚泥の一部を返送汚泥として曝気槽に
返送し、残部を余剰汚泥として排出している。このよう
な活性汚泥処理法では、ズーグレア等の細菌類が優勢と
なった活性汚泥により有機物が分解されるが、原水の性
状や各種処理条件によっては、活性汚泥中にスファエロ
チルス等の糸状細菌が増殖して、糸状性バルキングによ
る固液分離障害が発生する場合がある。2. Description of the Related Art In an activated sludge treatment method for organic wastewater, wastewater is mixed with activated sludge in an aeration tank to be aerated, the sludge is separated in a solid-liquid separation tank, and the separated liquid is discharged as treated water while being separated. A part of the generated sludge is returned to the aeration tank as return sludge, and the rest is discharged as excess sludge. In such an activated sludge treatment method, organic matter is decomposed by activated sludge in which bacteria such as zooglare are dominant, but filamentous bacteria such as sphaerotils grow in the activated sludge depending on the properties of raw water and various treatment conditions. Then, solid-liquid separation failure may occur due to filamentous bulking.
【０００３】糸状性バルキングは糸状細菌の増殖によっ
て活性汚泥が軽質化して固液分離性が悪化する現象であ
る。このようなバルキングが発生すると、固液分離障害
により固液分離槽における汚泥の分離が困難になり、汚
泥が処理水とともに流出するため、十分な返送汚泥を確
保することができず、処理性能は悪化する。Filamentous bulking is a phenomenon in which activated sludge is lightened by the growth of filamentous bacteria and solid-liquid separation is deteriorated. When such bulking occurs, it becomes difficult to separate the sludge in the solid-liquid separation tank due to the solid-liquid separation obstacle, and the sludge flows out together with the treated water, so it is not possible to secure sufficient return sludge and the treatment performance is Getting worse.
【０００４】従来、このような糸状性バルキングを防止
するために、各種殺菌剤を添加して糸状細菌の増殖を抑
制する方法があり、殺菌剤として第四アンモニウム塩が
使用されている。特公昭６３−３９５６２号には、塩化
ベンザルコニウム、塩化ベンゼトニウムおよびこれらの
混合物が糸状細菌のみを殺菌し、他の細菌には影響を与
えることなく、バルキングを抑制できることが示されて
いる。しかし一般的には、第四アンモニウム塩は殺菌剤
であるため、糸状細菌以外の細菌の増殖をも抑制し、ま
た人畜にも影響を及ぼすので、好ましくないとされてい
る（例えば特公平３−３８０００号）。Conventionally, in order to prevent such filamentous bulking, there is a method of inhibiting the growth of filamentous bacteria by adding various bactericides, and a quaternary ammonium salt is used as a bactericide. Japanese Examined Patent Publication No. 63-39562 shows that benzalkonium chloride, benzethonium chloride, and a mixture thereof can sterilize only filamentous bacteria and suppress bulking without affecting other bacteria. However, in general, quaternary ammonium salt is a bactericidal agent, and therefore, it also suppresses the growth of bacteria other than filamentous bacteria and also affects humans and animals. 38000).
【０００５】またノニオン性界面活性剤またはアニオン
性界面活性剤を含む活性汚泥処理系における固液分離障
害抑制剤も提案されている（特開平５−２６５２２８
号）。しかしこの抑制剤は界面活性剤により糸状細菌が
鞘状体内で収縮し、鞘状体から脱落または溶菌し、ある
いは鞘状体が切断されてバルキングが抑制されるので、
活性汚泥の沈降性はやや向上するものの、それだけでは
十分でない場合がある。A solid-liquid separation inhibitor in an activated sludge treatment system containing a nonionic surfactant or an anionic surfactant has also been proposed (JP-A-5-265228).
issue). However, since this inhibitor causes filamentous bacteria to contract in the sheath by the surfactant and fall off or lyse from the sheath, or the sheath is cut to suppress bulking,
Although the settling property of activated sludge is slightly improved, it may not be enough by itself.
【０００６】さらに微生物製剤と粒状担体を使用する方
法も提案されている（特開平２−２４１５９６号）。し
かしここで用いられる微生物製剤は、糸状菌を捕食ある
いは切断する有用微生物を培養し製剤化したものであ
り、これと粒状担体を併用することにより、製剤中の微
生物を固定化して増殖させるとともに活性汚泥中の微生
物の沈降性を改善する。しかし、製剤中の微生物が増殖
して十分に糸状菌を減少させるには時間がかかるため、
緊急にバルキングを抑制させるためには無機・有機の凝
集剤の併用が不可欠であった。Further, a method of using a microbial preparation and a granular carrier has also been proposed (Japanese Patent Laid-Open No. 2-241596). However, the microbial preparations used here are prepared by culturing useful microorganisms that prey or cleave filamentous fungi, and by using this in combination with a granular carrier, the microorganisms in the preparation are immobilized and proliferated, and active. Improves sedimentation of microorganisms in sludge. However, since it takes time for the microorganisms in the formulation to grow and sufficiently reduce filamentous fungi,
In order to prevent bulking urgently, it was essential to use a combination of inorganic and organic coagulants.
【０００７】[0007]
【発明が解決しようとする課題】本発明の課題は、糸状
細菌以外の細菌および人畜に対して害を及ぼすことな
く、効果的に糸状性バルキングを抑制するとともに、フ
ロックの形成を促進して固液分離性を高めることができ
る活性汚泥処理系における固液分離障害抑制剤および固
液分離障害抑制方法を提案することである。The object of the present invention is to effectively suppress filamentous bulking and to promote the formation of flocs without causing harm to bacteria other than filamentous bacteria and humans and animals. It is an object of the present invention to propose a solid-liquid separation obstacle suppressor and a method for suppressing solid-liquid separation obstacle in an activated sludge treatment system which can enhance liquid separation properties.
【０００８】[0008]
【課題を解決するための手段】本発明は、次の活性汚泥
処理系における固液分離障害抑制剤および固液分離障害
抑制方法である。
（１） ノニオン性またはアニオン性界面活性剤と、粒
径が２００μｍ以下の粒状担体とを含むことを特徴とす
る活性汚泥処理系における固液分離障害抑制剤。（２） 活性汚泥処理系が、活性汚泥中に糸状性細菌が
発生している処理系であることを特徴とする（１）に記
載の活性汚泥処理系における固液分離障害抑制剤。 （３） ノニオン性またはアニオン性界面活性剤と、粒
径が２００μｍ以下の粒状担体とを活性汚泥処理系に添
加することを特徴とする活性汚泥処理系における固液分
離障害抑制方法。 （４） 界面活性剤及び粒状担体の添加量が、活性汚泥
を含む液に対して、それぞれＭＬＳＳの１／１００〜１
／３及び１／２０〜５倍であることを特徴とする（３）
に記載の活性汚泥処理系における固液分離障害抑制方
法。 （５） 活性汚泥処理系が、活性汚泥中に糸状性細菌が
発生している処理系であることを特徴とする（３）又は
（４）に記載の活性汚泥処理系における固液分離障害抑
制方法。 The present invention is a solid-liquid separation disorder inhibitor and a method for suppressing solid-liquid separation disorder in the following activated sludge treatment system. (1) Nonionic or anionic surfactant and particles
A solid-liquid separation disorder inhibitor in an activated sludge treatment system, which comprises a granular carrier having a diameter of 200 μm or less . (2) Activated sludge treatment system, filamentous bacteria in activated sludge
Described in (1), which is the processing system that is occurring.
Suppressor for solid-liquid separation in the activated sludge treatment system. (3) Nonionic or anionic surfactant and particles
Add a granular carrier with a diameter of 200 μm or less to the activated sludge treatment system.
Solid-liquid content in activated sludge treatment system characterized by addition
Isolation obstacle control method. (4) The amount of surfactant and granular carrier added is activated sludge.
1/100 to 1 of MLSS for the liquid containing
/ 3 and 1/20 to 5 times (3)
To inhibit solid-liquid separation in activated sludge treatment system
Law. (5) Activated sludge treatment system, filamentous bacteria in activated sludge
(3) characterized in that it is a processing system that occurs
Suppression of solid-liquid separation failure in the activated sludge treatment system according to (4)
Control method.
【０００９】本発明において、活性汚泥処理系とは、活
性汚泥を用いて好気性処理を行うあらゆる方法における
処理系を示し、標準活性汚泥処理法のほかに、その変形
および他の処理法との組合せによる処理法における処理
系を含む。ここで処理系とは、上記処理を行うための系
全体を意味し、この処理系の任意の位置に本発明の固液
分離障害抑制剤を添加することによりバルキングによる
固液分離障害を抑制することができる。また本発明にお
いて、抑制とは、バルキングの発生を防止すること、す
でに発生したバルキングによる固液分離障害を解消する
こと、進行および拡大を抑制することを意味する。In the present invention, the activated sludge treatment system refers to a treatment system in any method of performing aerobic treatment using activated sludge, and in addition to the standard activated sludge treatment method, its variants and other treatment methods. It includes the processing system in the processing method by combination. Here, the treatment system means the entire system for performing the above treatment, and the solid-liquid separation disorder inhibitor of the present invention is added to any position of the treatment system to suppress the solid-liquid separation disorder due to bulking. be able to. Further, in the present invention, suppression means prevention of bulking, elimination of solid-liquid separation obstacle due to bulking that has already occurred, and suppression of progress and expansion.
【００１０】本発明において使用できる界面活性剤は、
ノニオン性またはアニオン性の界面活性剤であり、その
種類は限定されず、天然由来のものでも、合成品でもよ
い。このようなノニオン性またはアニオン性の界面活性
剤は、家庭用としても使用されており、糸状細菌以外の
細菌および人畜に対する害はなく、安全である。特に、
ノニオン性の界面活性剤はアニオン性のものよりも汚泥
への吸着がよく、処理水への移行が少ないので好まし
い。Surfactants which can be used in the present invention are
It is a nonionic or anionic surfactant, and the kind thereof is not limited, and may be a naturally derived or a synthetic product. Such a nonionic or anionic surfactant is also used for household purposes, and is safe without causing any harm to bacteria other than filamentous bacteria and humans and animals. In particular,
Nonionic surfactants are preferable because they adsorb to sludge better than anionic ones and transfer to treated water less.
【００１１】ノニオン性界面活性剤としては、例えばア
ルキルフェノールエチレンオキシド付加物、高級アルコ
ールエチレンオキシド付加物、脂肪酸エチレンオキシド
付加物、多価アルコール脂肪酸エステルエチレンオキシ
ド付加物、高級アルキルアミンエチレンオキシド付加
物、脂肪酸アミドエチレンオキシド付加物、油脂のエチ
レンオキシド付加物、ポリプロピレングリコールエチレ
ンオキシド付加物等のポリエチレングリコール型；グリ
セロールの脂肪酸エステル、ペンタエリスリトールの脂
肪酸エステル、ソルビトールおよびソルビタンの脂肪酸
エステル、ショ糖の脂肪酸エステル、多価アルコールの
アルキルエーテル、アルカノールアミン類の脂肪酸アミ
ド等の多価アルコール型などが例示できる。特に、アル
キルフェノールエチレンオキシド付加物、高級アルコー
ルエチレンオキシド付加物が好ましい。ノニオン性界面
活性剤としては、ＨＬＢ８〜１８のものが好ましく、特
にＨＬＢ１０〜１５のものが最も好ましい。Examples of nonionic surfactants include alkylphenol ethylene oxide adducts, higher alcohol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts, Polyethylene glycol type such as ethylene oxide adduct of fats and oils, polypropylene glycol ethylene oxide adduct, etc .; fatty acid ester of glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, alkyl ether of polyhydric alcohol, alkanolamine Examples thereof include polyhydric alcohol types such as fatty acid amides. Particularly, an alkylphenol ethylene oxide adduct and a higher alcohol ethylene oxide adduct are preferable. As the nonionic surfactant, those having HLB 8 to 18 are preferable, and those having HLB 10 to 15 are most preferable.
【００１２】アニオン性界面活性剤としては、例えば、
セッケン等のカルボン酸塩；高級アルコール硫酸エステ
ル塩、高級アルキルエーテル硫酸エステル塩、硫酸化
油、硫酸化脂肪酸エステル、硫酸化オレフィン等の硫酸
エルテル塩；アルキルベンゼンスルホン酸塩、アルキル
ナフタレンスルホン酸塩、パラフィンスルホン酸塩等の
スルホン酸塩；高級アルコールリン酸エステル等のリン
酸エステル塩などが例示できる。As the anionic surfactant, for example,
Carboxylic acid salts such as soaps; higher alcohol sulfate ester salts, higher alkyl ether sulfate ester salts, sulfated oils, sulfated fatty acid esters, sulfated ether salts such as sulfated olefins; alkylbenzene sulfonates, alkylnaphthalenesulfonates, paraffins Examples thereof include sulfonates such as sulfonates; phosphate ester salts such as higher alcohol phosphate esters.
【００１３】これらの界面活性剤と併用する粒状担体は
活性汚泥中の微生物を担持して固定できるものであれば
よく、その種類等は限定されないが、例えば高炉水砕ス
ラグ、粘土、活性炭、焼却灰などがある。粒径は２００
μｍ以下であり、５〜１００μｍのものが好ましい。[0013] particulate carrier used in combination with these surfactants as long as it can be fixed by supporting the microorganisms in the activated sludge, the species and the like is not limited, for example, blast furnace slag, clay, activated carbon, Ru ash Nadogaa. Particle size is 200
It is less than or equal to μm , and preferably 5 to 100 μm.
【００１４】これらの界面活性剤および粒状担体はそれ
ぞれ１種単独で、あるいは数種を組合せて使用すること
ができる。界面活性剤および粒状担体は活性汚泥処理系
に添加された際に共存すればよいから、これらは予め混
合されていてもよく、また別々に包装して保管し、別々
に添加し、処理系で混合されてもよい。These surfactants and granular carriers can be used alone or in combination of several kinds. Since the surfactant and the granular carrier may coexist when added to the activated sludge treatment system, they may be premixed, or may be separately packaged and stored, added separately, and then treated in the treatment system. It may be mixed.
【００１５】上記の界面活性剤および粒状担体は混合し
た状態で、あるいは別々に活性汚泥処理系の任意の場所
に添加することができるが、特に曝気槽に添加するのが
好ましい。別々に添加する場合は別の位置に添加しても
よい。また添加時期は前後してもよく、例えば界面活性
剤を添加して糸状菌の死滅を確認した後粒状担体を添加
することができる。The above-mentioned surfactant and granular carrier can be added in a mixed state or separately to any place in the activated sludge treatment system, but it is particularly preferably added to the aeration tank. When added separately, they may be added at different positions. The timing of addition may be changed, for example, a surfactant may be added to confirm the killing of the filamentous fungi, and then the granular carrier may be added.
【００１６】界面活性剤および粒状担体の添加量は、そ
の種類、添加方法等によって異なるが、一般的には活性
汚泥を含む液、例えば曝気槽内の混合液に対して、界面
活性剤はＭＬＳＳの１／１００〜１／３、好ましくは１
／３０〜１／１０、粒状担体はＭＬＳＳの１／２０〜５
倍、好ましくは１／５〜２倍程度が適当である。添加方
法は連続的に添加してもよく、また所定時間例えば１日
に１回の割合で上記濃度となるように間欠的に添加して
もよいが、糸状菌の発生が顕微鏡観察により確認される
毎に上記濃度となるように添加するのが好ましい。ま
た、バルキングが軽微の場合は、最初の１回の添加のみ
でよい場合もある。The amount of the surfactant and the granular carrier to be added varies depending on the type, the addition method and the like, but generally, the surfactant is MLSS for a liquid containing activated sludge, for example, a mixed liquid in an aeration tank. 1/100 to 1/3, preferably 1
/ 30 to 1/10, granular carrier is 1/20 to 5 of MLSS
It is suitable to double, preferably 1/5 to 2 times. The addition method may be continuous addition, or intermittent addition may be performed at a predetermined time, for example, once a day so as to achieve the above concentration, but the occurrence of filamentous fungi is confirmed by microscopic observation. It is preferable to add it so that the above concentration will be obtained each time. Further, when the bulking is slight, there are cases where only the first addition is required.
【００１７】このようにしてノニオン性またはアニオン
性界面活性剤および粒状担体を添加すると活性汚泥中の
糸状性細菌はノニオン性またはアニオン性界面活性剤の
作用により添加後短時間で増殖を停止し、鞘状体が消滅
する現象が見られ、バルキングが抑制される。そして粒
状担体はフロックに吸着され糸状性細菌死滅後のフロッ
クの密度を向上させ、より強固なフロック形成を促進す
る。このとき活性汚泥中の他の細菌は影響を受けず、有
機物に対する分解活性は維持される。When the nonionic or anionic surfactant and the granular carrier are added in this manner, the filamentous bacteria in the activated sludge stop their growth in a short time after the addition due to the action of the nonionic or anionic surfactant, The phenomenon that the sheath body disappears is seen, and bulking is suppressed. Then, the granular carrier is adsorbed by the flocs to improve the density of the flocs after the filamentous bacteria are killed, and promotes stronger floc formation. At this time, other bacteria in the activated sludge are not affected and the decomposition activity for organic matter is maintained.
【００１８】界面活性剤および粒状担体の添加により、
曝気槽における発泡が激しくなるときは、消泡剤を添加
して発泡を防止することができる。ここで使用できる消
泡剤としては、シリコーン油、ポリプロピレングリコー
ル等があげられる。この場合でもバルキング抑制効果は
得られる。By the addition of surfactants and granular carriers,
When foaming in the aeration tank becomes severe, an antifoaming agent can be added to prevent foaming. Examples of the defoaming agent that can be used here include silicone oil and polypropylene glycol. Even in this case, the bulking suppressing effect can be obtained.
【００１９】[0019]
【発明の効果】本発明によれば、活性汚泥処理系にノニ
オン性またはアニオン性界面活性剤と、粒径が２００μ
ｍ以下の粒状担体を添加するようにしたので、これらの
相乗効果により活性汚泥中の糸状細菌以外の細菌および
人畜に対して害を及ぼすことなく、活性汚泥の糸状性バ
ルキングを抑制するとともに、フロックの形成を促進し
て固液分離性を高めることができる。According to the present invention, the activated sludge treatment system contains a nonionic or anionic surfactant and a particle size of 200 μm.
Since a granular carrier having a particle size of m or less is added, the synergistic effect suppresses the filamentous bulking of the activated sludge without harming bacteria other than the filamentous bacteria in the activated sludge and humans and livestock, and prevents flocs from occurring. Formation can be promoted and solid-liquid separation can be enhanced.
【００２０】[0020]
【発明の実施の形態】以下、本発明の実施例および比較
例について説明する。各例中、％は重量％である。BEST MODE FOR CARRYING OUT THE INVENTION Examples and comparative examples of the present invention will be described below. In each example,% is% by weight.
【００２１】実施例１、比較例１
タイプ０２１Ｎによる糸状性バルキング汚泥（ＭＬＳＳ
２０００ｍｇ／ｌ）を１ liter容ビーカーに入れ、２５
℃において１ liter／分で通気し排水処理した。同様の
ビーカーを２系列作成した。一方にポリオキシエチレン
ノニルフェニルエーテル（ＨＬＢ１４）を３０ｍｇ／
ｌ、平均粒径１２μｍの高炉水砕スラグを１ｇ／ｌとな
るように添加して人工排水を通水した（実施例１）。も
う一方にはポリオキシエチレンノニルフェニルエーテル
（ＨＬＢ１４）を３０ｍｇ／ｌのみを添加して人工排水
を通水した（比較例１）。人工排水はグルコース１０
％、ペプトン１０％、リン酸１カリウム５％、リン酸１
ナトリウム１０％の組成で、ｐＨ７．０に調整した。Ｔ
ＯＣ負荷は０．５ｋｇ／ｍ3・日とした。Example 1, Comparative Example 1 Filamentous bulking sludge (MLSS) according to type 021N
2000 mg / l) in a 1 liter beaker for 25
The wastewater was treated by aeration at 1 liter / min at ℃. Two series of similar beakers were created. On the other hand, polyoxyethylene nonylphenyl ether (HLB14) 30 mg /
Granulated blast furnace slag having an average particle diameter of 12 μm was added at 1 g / l to pass artificial wastewater (Example 1). To the other side, only 30 mg / l of polyoxyethylene nonylphenyl ether (HLB14) was added and artificial drainage was passed (Comparative Example 1). Artificial drainage is glucose 10
%, Peptone 10%, potassium 1 phosphate 5%, phosphoric acid 1
The composition was adjusted to pH 7.0 with 10% sodium. T
The OC load was 0.5 kg / m 3 · day.
【００２２】その結果、２系列とも１２時間後で糸状細
菌の溶菌が観察され、３日後には汚泥中に糸状細菌はほ
とんど見いだせなくなったが、水砕スラグを添加した場
合に沈降性の改善はより著しくなった。表１に示す時間
経過後の曝気液を３０分間静置した後の汚泥容量（ＳＶ
３０）の変化を表１に示す。As a result, lysis of filamentous bacteria was observed after 12 hours in both series, and filamentous bacteria were hardly found in the sludge after 3 days. However, when granulated slag was added, sedimentation was not improved. It became more remarkable. Sludge volume (SV after the aeration liquid was allowed to stand for 30 minutes after the time shown in Table 1)
The changes in 30) are shown in Table 1.
【００２３】[0023]
【表１】 [Table 1]
【００２４】実施例２
曝気槽容量８００ｍ3、沈殿槽容積３００ｍ3でＢＯＤ６
００ｍｇ／ｌの排水を容積負荷０．６３ｋｇ−ＢＯＤ／
ｍ3・日で処理している菓子製造工場の処理装置で試験
を行った。ＭＬＳＳは３７５０ｍｇ／ｌ（ＭＬＶＳＳは
３０００ｍｇ／ｌ）、ＳＶ３０は９８％と高く、糸状細
菌はタイプ１７０１であることが確認された。曝気槽上
部よりポリオキシエチレンラウリルエーテル（ＨＬＢ１
４）を１５０ｍｇ／ｌ、水砕スラグを３ｇ／ｌとなるよ
うに添加した。添加直後からＳＶ３０は低下し始め、２
日後にＭＬＳＳは７３００ｍｇ／ｌ（ＭＬＶＳＳは４３
００ｍｇ／ｌ）、ＳＶ３０は４５％にまで低下した。こ
の間のＳＶ３０を表２に示す。Example 2 BOD 6 with an aeration tank volume of 800 m 3 and a precipitation tank volume of 300 m 3
The volume load of wastewater of 00 mg / l is 0.63 kg-BOD /
Tests were conducted by the processing device of the confectionery manufacturing plant which is treated with m 3 · day. It was confirmed that MLSS was as high as 3750 mg / l (MLVSS was 3000 mg / l), SV30 was as high as 98%, and that the filamentous bacterium was type 1701. From the top of the aeration tank, polyoxyethylene lauryl ether (HLB1
4) was added at 150 mg / l and granulated slag was added at 3 g / l. Immediately after the addition, SV30 begins to decrease, and 2
After 7 days, MLSS was 7300 mg / l (MLVSS was 43
00 mg / l), SV30 dropped to 45%. Table 2 shows the SV30 during this period.
【表２】 [Table 2]
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/12 C02F 3/00 C02F 3/28 - 3/34 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) C02F 3/12 C02F 3/00 C02F 3/28-3/34
Claims (5)
と、粒径が２００μｍ以下の粒状担体とを含むことを特
徴とする活性汚泥処理系における固液分離障害抑制剤。1. A solid-liquid separation disorder inhibitor in an activated sludge treatment system, comprising a nonionic or anionic surfactant and a granular carrier having a particle size of 200 μm or less .
細菌が発生している処理系であることを特徴とする請求Claims characterized by a treatment system in which bacteria are generated
項１に記載の活性汚泥処理系における固液分離障害抑制Suppression of solid-liquid separation failure in the activated sludge treatment system according to Item 1.
剤。Agent.
と、粒径が２００μｍ以下の粒状担体とを活性汚泥処理And a granular carrier with a particle size of 200 μm or less are treated with activated sludge.
系に添加することを特徴とする活性汚泥処理系におけるIn the activated sludge treatment system characterized by being added to the system
固液分離障害抑制方法。Method for suppressing solid-liquid separation disorder.
性汚泥を含む液に対して、それぞれＭＬＳＳの１／１０1/10 of the MLSS for liquids containing activated sludge
０〜１／３及び１／２０〜５倍であることを特徴とするCharacteristic is 0 to 1/3 and 1/20 to 5 times
請求項３に記載の活性汚泥処理系における固液分離障害Solid-liquid separation obstacle in the activated sludge treatment system according to claim 3.
抑制方法。Suppression method.
細菌が発生している処理系であることを特徴とする請求Claims characterized by a treatment system in which bacteria are generated
項３又は４に記載の活性汚泥処理系における固液分離障Item 3. Solid-liquid separation obstacle in the activated sludge treatment system according to item 3 or 4.
害抑制方法。Harm control method.
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|---|---|---|---|
| JP01934598A JP3414240B2 (en) | 1998-01-30 | 1998-01-30 | Agent and method for suppressing solid-liquid separation failure in activated sludge treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01934598A JP3414240B2 (en) | 1998-01-30 | 1998-01-30 | Agent and method for suppressing solid-liquid separation failure in activated sludge treatment system |
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| Publication Number | Publication Date |
|---|---|
| JPH11216484A JPH11216484A (en) | 1999-08-10 |
| JP3414240B2 true JP3414240B2 (en) | 2003-06-09 |
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