JPH07990A - Treatment of waste water - Google Patents
Treatment of waste waterInfo
- Publication number
- JPH07990A JPH07990A JP5170906A JP17090693A JPH07990A JP H07990 A JPH07990 A JP H07990A JP 5170906 A JP5170906 A JP 5170906A JP 17090693 A JP17090693 A JP 17090693A JP H07990 A JPH07990 A JP H07990A
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- aeration tank
- velocity gradient
- treatment
- waste water
- 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.)
- Withdrawn
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
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排水の処理方法に関
し、特に活性汚泥法におけるバルキング発生を抑制し得
る排水の処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment method, and more particularly to a wastewater treatment method capable of suppressing the occurrence of bulking in the activated sludge method.
【０００２】[0002]
【従来の技術】従来、各種有機物を含む排水の処理方法
として活性汚泥方式が広く使用されている。この活性汚
泥方式は効率の高い処理方法であり、良質な処理水が経
済的に得られることから最も広く普及している処理方法
である。2. Description of the Related Art Conventionally, an activated sludge system has been widely used as a method for treating wastewater containing various organic substances. This activated sludge system is a highly efficient treatment method, and is the most widely used treatment method because it produces high quality treated water economically.
【０００３】[0003]
【発明が解決しようとしている課題】上記活性汚泥方式
において残された最も重要な問題は、処理後の処理水と
活性汚泥との分離であり、処理水と活性汚泥とは沈澱槽
である分離領域において活性汚泥が速やかに沈澱分離す
ることが望ましいが、分離領域において静置時に糸状菌
等の発生によるバルキング現象やデフロック現象が生じ
て活性汚泥の凝集フロック作用が低下し、活性汚泥の沈
澱分離が不十分となり、活性汚泥の流出という問題が生
じる。活性汚泥と処理水との分離を促進させる方法とし
て、カチオンポリマー等の高分子凝集剤や多価金属イオ
ン等の無機凝集剤を使用する方法が知られているが、こ
れらの凝集剤は生物分解性が不十分である為、処理水と
共に放水されることにより環境汚染の問題が派生する。
従って本発明の目的は、排水凝集処理方法において、活
性汚泥のバルキング現象を生じることなく効率的に活性
汚泥を分離することが出来る排水の処理方法を提供する
ことである。The most important problem remaining in the above activated sludge system is the separation of the treated water and the activated sludge after the treatment, and the treated water and the activated sludge are a separation area which is a settling tank. In this case, it is desirable that the activated sludge be rapidly separated by sedimentation, but the bulking phenomenon and deflocculation phenomenon caused by the generation of filamentous fungi, etc. occur in the separation area when it is allowed to stand, and the flocculating floc action of the activated sludge is reduced, and the sedimentation separation of activated sludge It becomes insufficient and the problem of activated sludge outflow arises. As a method for promoting the separation of activated sludge and treated water, a method of using a polymer flocculant such as a cationic polymer or an inorganic flocculant such as a polyvalent metal ion is known. Due to its insufficient property, the problem of environmental pollution is caused by being discharged together with the treated water.
Therefore, it is an object of the present invention to provide a wastewater treatment method capable of efficiently separating activated sludge without causing the bulking phenomenon of the activated sludge in the wastewater coagulation treatment method.
【０００４】[0004]
【課題を解決する為の手段】上記目的は以下の本発明に
よって達成される。即ち、本発明は、活性汚泥法によっ
て排水処理を行うに際し、曝気槽混合液に対して強い速
度匂配を有する水流を与え、糸状微生物の糸状体形成を
抑制することを特徴とする排水の処理方法である。The above object can be achieved by the present invention described below. That is, the present invention, when performing the wastewater treatment by the activated sludge method, to give a water flow having a strong velocity gradient to the aeration tank mixture, the treatment of wastewater characterized by suppressing the filamentous formation of filamentous microorganisms Is the way.
【０００５】[0005]
【作用】活性汚泥法によって排水処理を行うに際し、曝
気槽混合液に対して強い速度匂配を有する水流を与える
ことによって、糸状微生物の糸状体形成を抑制すること
が出来る。即ち、曝気槽混合液中で発生する糸状微生物
を強い流速匂配の流水が存在する環境下におくと、糸状
微生物の細胞が縦に連なった糸状体を形成することな
く、分散状態の単菌状態、或はごく短い連菌状態とな
り、長い糸状体の形成を抑制することができる。この結
果、糸状性微生物の発生が原因となるバルキング発生を
抑制することができる。When the wastewater treatment is carried out by the activated sludge method, the filamentous formation of filamentous microorganisms can be suppressed by giving a water flow having a strong velocity gradient to the aeration tank mixture. That is, when the filamentous microorganisms generated in the aeration tank mixture are placed in an environment where flowing water with a strong flow rate is present, the filamentous microorganisms do not form filaments in which they are vertically connected, In this state, or in a very short bacterial state, it is possible to suppress the formation of long filaments. As a result, it is possible to suppress the occurrence of bulking caused by the generation of filamentous microorganisms.
【０００６】[0006]
【好ましい実施態様】次に好ましい実施態様を挙げて本
発明を更に詳しく説明する。本発明で使用する活性汚泥
法は、現在広く使用されており、処理すべき有機排水を
曝気槽に流入させ、曝気槽内の活性汚泥（好気性菌）と
良く撹拌混合させて、空気と接触させ或は同時に空気を
吹き込んで、活性汚泥を排水中の有機物を飼料として増
殖させ、排水中の有機物を分解し、最終的には有機物を
炭酸ガス、硝酸等に分解除去するものである。この際、
曝気槽における混合撹拌は通常下記定義のＧ値が約５０
〜２００程度の緩やかな撹拌速度で行われる。活性汚泥
処理された排水は次の沈澱槽に移され、活性汚泥を沈澱
させ、分離した上澄み液を処理済水として放流する。こ
の際、活性汚泥の沈澱が速やかであることが望ましい
が、曝気槽内において絡み合った繊維屑の糸状微生物が
繁殖する場合が多く、この糸状菌が活性汚泥とフロック
を形成し、活性汚泥の沈澱が妨げられる場合が多い。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the preferred embodiments. The activated sludge method used in the present invention is widely used at present, and the organic wastewater to be treated is allowed to flow into the aeration tank, and well mixed with the activated sludge (aerobic bacteria) in the aeration tank to contact with air. Alternatively or simultaneously, air is blown into the activated sludge to grow the organic matter in the wastewater as a feed, decompose the organic matter in the wastewater, and finally decompose and remove the organic matter into carbon dioxide gas, nitric acid and the like. On this occasion,
Mixing and stirring in an aeration tank usually has a G value of about 50 as defined below.
It is carried out at a gentle stirring speed of about 200. The wastewater treated with activated sludge is transferred to the next settling tank, the activated sludge is allowed to settle, and the separated supernatant is discharged as treated water. At this time, it is desirable that the activated sludge settle quickly, but in many cases filamentous microorganisms of entangled fiber wastes propagate in the aeration tank, and this filamentous fungus forms flocs with the activated sludge, and the activated sludge precipitates. Is often disturbed.
【０００７】本発明の方法では、上記曝気槽内で有機排
水を通常の方法と同様に好気処理する際、曝気用の撹拌
装置に加え、別の撹拌機或は水中ポンプ等を設置し、曝
気槽混合液に対して強い速度匂配を有する水流を与える
ことによって、発生増殖した糸状微生物が分断されてそ
の長さが著しく短くなり、活性汚泥法における沈澱槽に
おいて糸状菌に基づく浮遊性のフロックが発生せず、活
性汚泥と処理済の水の分離が良好になることを見出し
た。In the method of the present invention, when the organic waste water is aerobically treated in the aeration tank in the same manner as in the ordinary method, a stirring device for aeration is additionally provided with another stirring machine or a submersible pump, By giving a stream of water with a strong velocity gradient to the aeration tank mixture, the filamentous microorganisms that have proliferated and proliferated are fragmented and their length is significantly shortened. It was found that flocs do not occur, and activated sludge and treated water are separated well.
【０００８】本発明においては、曝気槽混合液に対して
強い速度匂配を有する水流を与えるが、この水流の速度
勾配Ｇは下記式によって求められる。与えられた時間に
おいて為された水力学的仕事或は動力消費は次式で表さ
れる。 In the present invention, a water flow having a strong velocity gradient is given to the aeration tank mixture, and the velocity gradient G of this water flow is obtained by the following equation. The hydraulic work or power consumption done at a given time is given by:
【０００９】本発明においては、上記Ｇ値が、２５０〜
６，５００の範囲において効果があり、更に速度勾配Ｇ
が１，０００〜６，０００の範囲において好ましい結果
が得られる。この様なＧ値は、各種の強力な撹拌機や水
中ポンプを使用することによって任意に変更することが
出来るが、Ｇ値を６，５００を越える値にするとエネル
ギー消費面で不経済である。In the present invention, the G value is 250 to
It is effective in the range of 6,500, and the velocity gradient G
A preferable result is obtained in the range of 1,000 to 6,000. Such a G value can be arbitrarily changed by using various powerful agitators and submersible pumps, but if the G value exceeds 6,500, it is uneconomical in terms of energy consumption.
【００１０】[0010]
【実施例】次に実施例を挙げて本発明を更に具体的に説
明する。 実施例１ 図１に示す撹拌機を、容積２ｍ３の曝気槽に図２の如く
設置し、乳業排水を被処理排水として用いて活性汚泥処
理を行った。平均ＭＬＳＳ濃度２，５００ｐｐｍ、平均
ＢＯＤ負荷０．３Ｋｇ−ＢＯＤ ／Ｋｇ・ｓｓ・日、曝
気はブロワを用いた気泡曝気を行い曝気槽溶存酸素濃度
（ＤＯ）１．５ｐｐｍに調整して処理を行った。Ｇ値
は、撹拌機駆動動力を求め、この値を流体容積Ｖ（外筒
容積）＝２，０００ｃｍ３中で消費される動力Ｐとし、
（２）式を用いて求めていた。各Ｇ値で３０日間運転後
の曝気槽混合液中の糸状性微生物の長さを顕微鏡観察に
よって測定した結果を下記表１に示す。EXAMPLES Next, the present invention will be described more specifically with reference to examples. Example 1 The stirrer shown in FIG. 1 was installed in an aeration tank having a volume of 2 m 3 as shown in FIG. 2, and activated sludge treatment was performed using dairy wastewater as treated wastewater. Average MLSS concentration of 2,500 ppm, average BOD load of 0.3 Kg-BOD / Kg · ss · day, aeration is performed by bubble aeration using a blower, and the treatment is performed by adjusting the aeration tank dissolved oxygen concentration (DO) to 1.5 ppm. It was For the G value, the agitator driving power is obtained, and this value is taken as the power P consumed in the fluid volume V (outer cylinder volume) = 2,000 cm 3 ,
It was calculated using the equation (2). Table 1 below shows the results of measuring the length of filamentous microorganisms in the aeration tank mixed solution after operating for 30 days at each G value by microscope observation.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【表２】 （表１の続き） [Table 2] (Continued from Table 1)
【００１３】又、撹拌機に替えて曝気槽内に揚水量０．
３２ｍ３／ｍｉｎ、全揚程５．８ｍの水中ポンプを投入
し、実施例１と同様に連続運転を行った。水の密度ρ＝
１，０００Ｋｇ／ｃｍ３とすると Further, the pumping amount of 0.
A submersible pump of 32 m 3 / min and a total lifting height of 5.8 m was introduced, and continuous operation was performed in the same manner as in Example 1. Water density ρ =
If it is 1,000 Kg / cm 3.
【００１４】３０日運転後の糸状性微生物の平均長さの
測定結果は、タイプ０２１Ｎが１１０μｍ、タイプ１７
０２が８０μｍ、Sphaerotilus natans が６０μｍであ
った。このように撹拌機に替えて水中ポンプを曝気槽に
投入して、部分的に強い水流の速度匂配を加えることで
も糸状性微生物の糸状体形成を抑制することが出来た。The measurement results of the average length of the filamentous microorganisms after operation for 30 days were 110 μm for type 021N and 17 for type 17.
02 was 80 μm and Sphaerotilus natans was 60 μm. As described above, the submerged pump was put into the aeration tank instead of the stirrer, and the filamentous formation of the filamentous microorganisms could be suppressed by partially adding the strong velocity velocities of the water flow.
【００１５】[0015]
【発明の効果】以上の如き本発明によれば、活性汚泥法
によって排水処理を行うに際し、曝気槽混合液に対して
強い速度匂配を有する水流を与えることによって、糸状
微生物の糸状体形成を抑制することが出来、その結果、
糸状性微生物の発生が原因となるバルキング発生を抑制
することができる。EFFECTS OF THE INVENTION According to the present invention as described above, when the wastewater treatment is carried out by the activated sludge method, the filamentous formation of filamentous microorganisms is achieved by giving a water flow having a strong velocity gradient to the aeration tank mixture. Can be suppressed, and as a result,
It is possible to suppress the occurrence of bulking caused by the generation of filamentous microorganisms.
【００１６】[0016]
【図１】実施例で用いた撹拌機FIG. 1 is a stirrer used in Examples.
【図２】実施例で用いた曝気槽FIG. 2 Aeration tank used in Examples
Claims (4)
し、曝気槽混合液に対して強い速度匂配を有する水流を
与え、糸状微生物の糸状体形成を抑制することを特徴と
する排水の処理方法。1. A method for treating wastewater, characterized in that, when performing wastewater treatment by the activated sludge method, a water flow having a strong velocity gradient is applied to an aeration tank mixed liquid to suppress filamentous microorganisms from forming filaments. .
る請求項１の記載の排水の処理方法。2. The method for treating wastewater according to claim 1, wherein the velocity gradient G is 250 to 6,500.
である請求項１の記載の排水の処理方法。3. The velocity gradient G is 1,000 to 6,000.
The method for treating wastewater according to claim 1, wherein
する水流を与える手段が、撹拌機又はポンプである請求
項１に記載の排水の処理方法。4. The method for treating wastewater according to claim 1, wherein the means for applying a water flow having a strong velocity gradient to the aeration tank mixture is a stirrer or a pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5170906A JPH07990A (en) | 1993-06-18 | 1993-06-18 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5170906A JPH07990A (en) | 1993-06-18 | 1993-06-18 | Treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07990A true JPH07990A (en) | 1995-01-06 |
Family
ID=15913532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5170906A Withdrawn JPH07990A (en) | 1993-06-18 | 1993-06-18 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07990A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004344741A (en) * | 2003-05-21 | 2004-12-09 | Nippon Soda Co Ltd | Sewage treatment method |
-
1993
- 1993-06-18 JP JP5170906A patent/JPH07990A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004344741A (en) * | 2003-05-21 | 2004-12-09 | Nippon Soda Co Ltd | Sewage treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4178239A (en) | Biological intermediate sewage treatment with ozone pretreatment | |
| US4452699A (en) | Method of improving the SVI of mixed liquor in aeration tank | |
| Tian et al. | Treatment of pharmaceutical wastewater for reuse by coupled membrane-aerated biofilm reactor (MABR) system | |
| JPH0240296A (en) | Apparatus and method for treating waste water | |
| JP4337787B2 (en) | Wastewater treatment method and treatment apparatus | |
| JP2003164890A (en) | Waste water treatment system and mixing equipment | |
| JP2002177990A (en) | Water cleaning method and water cleaning plant | |
| CN107915366A (en) | A kind of technique that advanced treating is carried out to garbage leachate using ozone | |
| JP4787814B2 (en) | Organic wastewater purification method and apparatus | |
| CN108689535A (en) | A kind of emulsifying liquid waste water integrated treatment unit | |
| JP3575047B2 (en) | Wastewater treatment method | |
| WO1995013990A1 (en) | Methods and apparatus for using micro-organisms to treat organic material found in waste water | |
| JPH0810785A (en) | Activated sludge device | |
| JP2006142183A (en) | Water purification method | |
| JPS649071B2 (en) | ||
| JPH07990A (en) | Treatment of waste water | |
| JP2003053378A (en) | Method and device for treating water by using separation membrane | |
| KR970059118A (en) | How to purify organic wastewater | |
| KR101384367B1 (en) | Wastewater treatment ultrasonic wave | |
| CN109502905A (en) | A kind of sewage treatment process | |
| RU2073649C1 (en) | Method of separating suspended matters from initial waste liquid in aerobic biological purification of waste water | |
| RU2742877C1 (en) | Apparatus for pretreatment of waste water before biological treatment | |
| Hidayah et al. | Combination of solid-liquid separation process to remove grease, oil and organic from food and dairy wastewater | |
| CN214192959U (en) | Novel ultrasonic cleaning wastewater treatment equipment | |
| KR960037587A (en) | Advanced biological and chemical circulation treatment of sewage and wastewater using integrated reactor and water quality control tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000905 |