JPH07155783A - Treatment of waste water - Google Patents
Treatment of waste waterInfo
- Publication number
- JPH07155783A JPH07155783A JP30564093A JP30564093A JPH07155783A JP H07155783 A JPH07155783 A JP H07155783A JP 30564093 A JP30564093 A JP 30564093A JP 30564093 A JP30564093 A JP 30564093A JP H07155783 A JPH07155783 A JP H07155783A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- aeration tank
- concentration
- ozone
- 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.)
- 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
- Activated Sludge Processes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、活性汚泥法による廃水
の処理方法に関するものであり、さらに詳しくはこの発
明は、高濃度の曝気槽汚泥でも良好な沈降を可能とし、
小さな容積でも効率良く処理することのできる活性汚泥
法による廃水の処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating wastewater by an activated sludge method. More specifically, the present invention enables good sedimentation even with a high-concentration aeration tank sludge,
The present invention relates to a method for treating wastewater by the activated sludge method, which enables efficient treatment even with a small volume.
【０００２】[0002]
【従来の技術】従来、活性汚泥法による廃水処理におい
ては、好気性微生物による有機物の分解反応を利用し
て、汚水のＢＯＤを所定濃度以下に低減させ、この処理
後の廃水を河川や海域、湖沼あるいは、公共下水道に放
流している。また、この活性汚泥法による曝気槽汚泥の
分離には、一般に重力による沈降分離方法が用いられて
おり、沈降分離による汚泥分離を十分に行わせるため
に、曝気槽での汚泥濃度を５，０００ｍｇ／ｌ以下の濃
度に設定して運転している場合が多い。2. Description of the Related Art Conventionally, in the treatment of wastewater by the activated sludge method, the decomposition reaction of organic substances by aerobic microorganisms is utilized to reduce the BOD of the wastewater to below a predetermined concentration, and the wastewater after this treatment is treated in rivers or sea areas. It is released to lakes or public sewers. Further, in order to separate the aeration tank sludge by this activated sludge method, a sedimentation separation method by gravity is generally used, and in order to sufficiently perform sludge separation by sedimentation separation, the sludge concentration in the aeration tank is 5,000 mg. In many cases, the operation is performed with the concentration set to 1 / l or less.
【０００３】そして、ＢＯＤ汚泥負荷量を０．５ｋｇＢ
ＯＤ／ｋｇＳＳ・日以上の高負荷で処理すると曝気槽汚
泥が粘性をもち、その沈降性が悪くなることが指摘され
ているため、活性汚泥処理を安定して行わせるために、
一般に曝気槽のＢＯＤ容積負荷を１ｋｇＢＯＤ／ｍ3 ・
日以下に抑えている。しかしながら実際には、ＢＯＤ濃
度が数１，０００ｍｇ／ｌ以上の高濃度廃水において
は、その処理に数日間以上要する場合が多く、莫大な処
理容積が必要となっている。このため、処理設備の減容
化や活性汚泥処理の効率を高めるためには、曝気槽の汚
泥濃度を高めることが重要である。そのための一つの方
策として、汚泥を担体に固定して保持する方法が挙げら
れるが、この方法では、汚泥を高濃度に保持することが
でき、処理水中の流出汚泥濃度を低く抑えることができ
るが、汚泥に対する酸素と汚濁物質の接触効率が悪くな
ることや余剰汚泥の排出方法、さらに担体の再生方法等
に問題を残し、高濃度廃水には、有効ではなかった。ま
た、高濃度廃水を処理する方法として、曝気槽の汚泥濃
度を高め、その汚泥を限外ろ過膜や精密ろ過膜で分離す
る方法も行われているが、膜面の詰まりによる処理量の
低下が著しく安定した処理量が得にくいことや、膜面を
頻繁に洗浄しなければならないこと、さらに膜の破損等
もあり実用面において多くの課題を残している。The BOD sludge load amount is 0.5 kgB.
It has been pointed out that the aeration tank sludge becomes viscous and its sedimentation property deteriorates when treated at a high load of OD / kgSS / day or more, so in order to carry out the activated sludge treatment in a stable manner,
Generally, the BOD volume load of the aeration tank is 1 kgBOD / m 3 ·
I keep it under a day. However, in reality, in high-concentration wastewater having a BOD concentration of several thousand mg / l or more, its treatment often requires several days or more, and a huge treatment volume is required. Therefore, it is important to increase the sludge concentration in the aeration tank in order to reduce the volume of treatment equipment and increase the efficiency of activated sludge treatment. As one measure for that, there is a method of fixing and holding sludge on a carrier, but with this method, sludge can be held at a high concentration, and the concentration of outflow sludge in the treated water can be suppressed to a low level. However, it was not effective for high-concentration wastewater, because the contact efficiency of oxygen and pollutants to sludge was deteriorated, there was a problem in the method of discharging excess sludge, and the method of regenerating carrier. In addition, as a method of treating high-concentration wastewater, a method of increasing the sludge concentration in the aeration tank and separating the sludge with an ultrafiltration membrane or a microfiltration membrane is also used, but the treatment amount decreases due to clogging of the membrane surface. However, there are many problems in practical use because it is difficult to obtain a very stable treatment amount, the membrane surface must be washed frequently, and the membrane is damaged.
【０００４】このように、活性汚泥法による従来の方法
では、曝気槽汚泥の固液分離を十分に行わせるために、
低いＭＬＳＳ濃度でかつ低く設定した負荷量で処理しな
ければならず、高濃度の廃水を処理するためには、大き
な処理容積を必要としていた。As described above, in the conventional method using the activated sludge method, in order to sufficiently perform solid-liquid separation of the aeration tank sludge,
It was necessary to treat with a low MLSS concentration and a low load amount set, and a large treatment volume was required to treat high-concentration wastewater.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、高濃度廃水
を処理する際に問題となる汚泥沈降性の悪化を抑制する
ことにより、小さな容積で効率良く活性汚泥処理を行う
ことができる廃水の処理方法を提供することを目的とす
る。DISCLOSURE OF THE INVENTION The present invention suppresses deterioration of sludge sedimentation, which is a problem when treating high-concentration wastewater, so that wastewater can be efficiently treated with a small volume. It is intended to provide a processing method.
【０００６】[0006]
【課題を解決するための手段】本発明者は、このような
課題を解決するために鋭意検討の結果、曝気槽にオゾン
と空気の混合気体を通気することにより、曝気槽汚泥の
凝集性を高め、活性汚泥処理の効率が飛躍的に向上する
という事実を見出し、本発明に到達した。すなわち、本
発明は、曝気槽汚泥（ＭＬＳＳ）の濃度を５，０００ｍ
ｇ／ｌ以上とし、かつ曝気槽におけるＢＯＤ容積負荷を
３ｋｇ／ｍ3 ・日以上で廃液を処理する活性汚泥曝気槽
において、空気とオゾンの混合気体を曝気することを特
徴とする廃水の処理方法を要旨とするものである。さら
に詳しく説明すると、本発明では、活性汚泥曝気槽にお
いて、空気とオゾンの混合気体を曝気することが必要で
あり、曝気気体に占めるオゾン濃度としては、１０〜２
００ｐｐｍであることが好ましい。また、本発明におけ
る曝気槽の汚泥濃度としては、５，０００mg／１以上に
設定することができるが、高負荷処理を行うためには、
１０，０００〜２０，０００mg／１に設定するのが望ま
しい。Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventor has found that the aeration tank sludge is agglomerated by aeration of a mixed gas of ozone and air into the aeration tank. The present invention has been accomplished by finding the fact that the efficiency of the activated sludge treatment is dramatically improved by increasing the efficiency. That is, in the present invention, the concentration of aeration tank sludge (MLSS) is 5,000 m.
A method for treating wastewater, which comprises aeration of a mixed gas of air and ozone in an activated sludge aeration tank which treats the waste liquid at a BOD volume load of 3 kg / m 3 · day or more in an aeration tank at g / l or more. Is the gist. More specifically, in the present invention, it is necessary to aerate the mixed gas of air and ozone in the activated sludge aeration tank, and the ozone concentration in the aerated gas is 10 to 2
It is preferably 00 ppm. Further, the sludge concentration of the aeration tank in the present invention can be set to 5,000 mg / 1 or more, but in order to perform high load treatment,
It is desirable to set it in the range of 10,000 to 20,000 mg / 1.
【０００７】[0007]
【作用】本発明においては、１０，０００ｍｇ／ｌ以上
の高濃度の曝気槽汚泥でも良好に沈降し、ＢＯＤ容積負
荷３ｋｇ／ｍ3 ・日以上、さらにはＢＯＤ容積負荷１０
ｋｇ／ｍ3 ・日の高負荷での処理もできるので、処理装
置の大幅な小型化が可能となる。In the present invention, even a high-concentration aeration tank sludge having a concentration of 10,000 mg / l or more settles well, BOD volume load of 3 kg / m 3 · day or more, and further BOD volume load of 10
Since it is possible to perform high-load processing of kg / m 3 · day, it is possible to greatly reduce the size of the processing equipment.
【０００８】このような作用は、曝気槽にオゾンを添加
することにより、曝気槽汚泥の凝集性が高まると共にオ
ゾンの反応により廃水中の汚濁物質が一部分解され、微
生物による分解を受け易くなるためと考えられる。[0008] This action is because the addition of ozone to the aeration tank enhances the cohesiveness of the aeration tank sludge, and the pollutants in the wastewater are partially decomposed due to the reaction of ozone, and are easily decomposed by microorganisms. it is conceivable that.
【０００９】[0009]
【実施例】次に、本発明を実施例によって具体的に説明
する。実施例１ ＢＯＤ濃度２１，０００ｍｇ／ｌの醤油工場廃液を対象
として、実効容積２００Ｌで汚泥（ＭＬＳＳ）濃度を約
１５，０００ｍｇ／ｌにした曝気槽に、オゾン濃度が５
６ｐｐｍとなるようにオゾンと空気の混合気体を曝気し
た。混合気体の曝気量は、２４０Ｌ／ｍｉｎであった。
また、曝気槽に供給される廃液量は、１００Ｌ／日であ
り、曝気槽に対するＢＯＤ容積負荷は、１０．５ｋｇ／
ｍ3 ・日である。曝気槽汚泥の分離は、実効容積５０Ｌ
のドルトムント式の沈澱槽で行った。曝気槽汚泥の保持
のため、沈澱槽からの曝気槽への返送汚泥量を１００Ｌ
／日とした。EXAMPLES Next, the present invention will be specifically described with reference to examples. Example 1 Targeting a soy sauce factory waste liquid having a BOD concentration of 21,000 mg / l, an ozone concentration of 5 was added to an aeration tank having an effective volume of 200 L and a sludge (MLSS) concentration of about 15,000 mg / l.
A mixed gas of ozone and air was aerated so as to be 6 ppm. The aeration rate of the mixed gas was 240 L / min.
The amount of waste liquid supplied to the aeration tank is 100 L / day, and the BOD volume load on the aeration tank is 10.5 kg / day.
m 3 · day. Separation of aeration tank sludge, effective volume 50L
It was performed in a Dortmund type precipitation tank. The amount of sludge returned from the settling tank to the aeration tank is 100 L to hold the aeration tank sludge.
/ Day.
【００１０】表１にオゾンを添加した時と添加しなかっ
た時の活性汚泥処理装置の処理結果を示した。この表１
から明らかなようにオゾンを添加した場合には、汚泥
（ＭＬＳＳ）濃度が約１５，０００ｍｇ／ｌと高濃度に
もかかわらず沈澱槽で汚泥が良好に沈降し、沈澱槽から
流出する処理水の汚泥（ＳＳ）濃度は、３５０ｍｇ／ｌ
となっている。一方、オゾンを添加しない場合には、沈
澱槽での汚泥の沈降性が悪く処理水中に約６，０００ｍ
ｇ／ｌものＳＳが流出している。そして、返送汚泥濃度
も低くなるため、ＭＬＳＳ濃度も１２，５００ｍｇ／ｌ
と低くなっている。また、処理水のＢＯＤ（溶解性）濃
度は、オゾンを添加しなかった場合には、８００ｍｇ／
ｌであるのに対し、オゾンを添加した場合には、２５０
ｍｇ／ｌと生物処理の効率も高まることが示された。Table 1 shows the treatment results of the activated sludge treatment apparatus when ozone was added and when ozone was not added. This table 1
As can be seen from the above, when ozone is added, the sludge satisfactorily settles in the settling tank even though the sludge (MLSS) concentration is as high as about 15,000 mg / l, and the treated water flowing out from the settling tank is discharged. Sludge (SS) concentration is 350 mg / l
Has become. On the other hand, when ozone is not added, the sludge settling property in the settling tank is poor, and about 6,000 m
SS of g / l is flowing out. And since the returned sludge concentration is also low, the MLSS concentration is also 12,500 mg / l
Is low. In addition, the BOD (solubility) concentration of the treated water is 800 mg /
In contrast, when ozone is added, it is 250
It was shown that the biotreatment efficiency was also increased to mg / l.
【００１１】[0011]
【表１】 [Table 1]
【００１２】実施例２ ＢＯＤ濃度８，５００ｍｇ／ｌのビール工場廃液を対象
として、上記の実効容積２００Ｌの曝気槽と実効容積５
０Ｌの沈澱槽を有する活性汚泥処理装置で廃液の供給量
を２００Ｌ／日即ちＢＯＤ容積負荷８．５ｋｇ／ｍ3 ・
日の条件で処理を行った。返送汚泥量を２００Ｌ／日と
した。ＭＬＳＳ濃度を、いずれも１０，０００ｍｇ／ｌ
以上になるように引き抜き汚泥量を調整した。オゾンの
添加量は、混合気体の２８ｐｐｍである。オゾンを添加
した場合としなかった場合の本装置での処理結果を表２
に示した。 Example 2 Aeration tank with an effective volume of 200 L and an effective volume of 5 were applied to a beer factory waste liquid having a BOD concentration of 8,500 mg / l.
With an activated sludge treatment device having a 0 L settling tank, the supply amount of waste liquid is 200 L / day, that is, the BOD volume load is 8.5 kg / m 3 ·
The treatment was carried out under day conditions. The amount of returned sludge was set to 200 L / day. MLSS concentration is 10,000 mg / l for all
The amount of extracted sludge was adjusted so as to be the above. The amount of ozone added is 28 ppm of the mixed gas. Table 2 shows the treatment results with this device with and without the addition of ozone.
It was shown to.
【００１３】実施例１と同様に、オゾンを添加した場合
には、沈澱槽での汚泥の沈降性が良くり、処理水中の流
出ＳＳ濃度は、オゾンを添加しなかった場合に較べ大幅
に低下した。Similar to Example 1, when ozone was added, the sludge settling property in the settling tank was improved, and the SS concentration of outflow in the treated water was significantly reduced as compared with the case where ozone was not added. did.
【００１４】[0014]
【表２】 [Table 2]
【００１５】[0015]
【発明の効果】以上詳しく述べたように、本発明によれ
ば活性汚泥処理装置の曝気槽にオゾンを添加することに
より曝気槽汚泥の凝集性が高まり沈澱槽における曝気槽
混合液の固液分離が大幅に改善されるため、曝気槽汚泥
濃度を大幅に高めることができる。さらにオゾンによる
汚濁物質の分解も加わり活性汚泥処理の効率が飛躍的に
高まり、曝気槽の容積を従来のものに較べ１／１０程度
に軽減される。As described in detail above, according to the present invention, by adding ozone to the aeration tank of the activated sludge treatment device, the cohesiveness of the aeration tank sludge is enhanced and the solid-liquid separation of the aeration tank mixture in the precipitation tank is increased. Since it is greatly improved, the aeration tank sludge concentration can be significantly increased. Furthermore, the decomposition of pollutants by ozone is also added, and the efficiency of activated sludge treatment is dramatically increased, and the volume of the aeration tank is reduced to about 1/10 of that of the conventional one.
フロントページの続き (72)発明者 北畠 千嗣 京都府宇治市宇治小桜23番地 ユニチカ株 式会社中央研究所内 (72)発明者 阪本 米和 京都府宇治市宇治小桜23番地 ユニチカ株 式会社中央研究所内Front page continuation (72) Inventor Senji Kitabata, 23 Uji Kozakura, Uji City, Kyoto Prefecture, Unitika Research Institute Central Research Laboratories (72) Inventor, Sakamoto Ume 23 Uji Kozakura, Uji City, Kyoto Unitika Stock Company Central Research Laboratories
Claims (1)
００ｍｇ／ｌ以上とし、かつ曝気槽におけるＢＯＤ容積
負荷を３ｋｇ／ｍ3 ・日以上で廃液を処理する活性汚泥
曝気槽において、空気とオゾンの混合気体を曝気するこ
とを特徴とする廃水の処理方法1. The concentration of aeration tank sludge (MLSS) is 5,0.
A method for treating wastewater, which comprises aerating a mixed gas of air and ozone in an activated sludge aeration tank which treats the waste liquid at a BOD volume load of 3 kg / m 3 · day or more in an aeration tank of at least 00 mg / l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30564093A JPH07155783A (en) | 1993-12-06 | 1993-12-06 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30564093A JPH07155783A (en) | 1993-12-06 | 1993-12-06 | Treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07155783A true JPH07155783A (en) | 1995-06-20 |
Family
ID=17947568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30564093A Pending JPH07155783A (en) | 1993-12-06 | 1993-12-06 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07155783A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000079384A (en) * | 1998-06-22 | 2000-03-21 | Jc Engineering Kk | Chemical and biological treatment system for waste |
| JP2006314911A (en) * | 2005-05-12 | 2006-11-24 | Takasago Thermal Eng Co Ltd | Sludge treatment method and waste water treatment system for biological treatment tank |
-
1993
- 1993-12-06 JP JP30564093A patent/JPH07155783A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000079384A (en) * | 1998-06-22 | 2000-03-21 | Jc Engineering Kk | Chemical and biological treatment system for waste |
| JP2006314911A (en) * | 2005-05-12 | 2006-11-24 | Takasago Thermal Eng Co Ltd | Sludge treatment method and waste water treatment system for biological treatment tank |
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