JP2003047986A - Wastewater treatment apparatus - Google Patents
Wastewater treatment apparatusInfo
- Publication number
- JP2003047986A JP2003047986A JP2001236087A JP2001236087A JP2003047986A JP 2003047986 A JP2003047986 A JP 2003047986A JP 2001236087 A JP2001236087 A JP 2001236087A JP 2001236087 A JP2001236087 A JP 2001236087A JP 2003047986 A JP2003047986 A JP 2003047986A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- activated sludge
- aeration
- biological 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
-
- 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
- Y02W10/20—Sludge processing
Landscapes
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機性廃水を活性
汚泥により処理する廃水処理装置に係り、特に、生物処
理槽から流出した活性汚泥を高圧ノズル噴射して汚泥処
理し、生物処理槽に返送する廃水処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for treating organic wastewater with activated sludge, and in particular, activated sludge flowing out from a biological treatment tank is injected into a biological treatment tank by high-pressure nozzle injection. It relates to a wastewater treatment device to be returned.
【０００２】[0002]
【従来の技術】下水や産業廃水等の有機性廃水は、活性
汚泥を用いた生物処理槽で生物処理される。その際、生
物処理槽から流出した活性汚泥は、沈殿池で分離した
後、返送汚泥として再び生物処理槽に戻される。2. Description of the Related Art Organic wastewater such as sewage and industrial wastewater is biologically treated in a biological treatment tank using activated sludge. At that time, the activated sludge flowing out of the biological treatment tank is separated in the sedimentation tank and then returned to the biological treatment tank as return sludge.
【０００３】しかし、生物処理槽内で増殖した微生物な
どが余剰の活性汚泥となって生成するため、余剰汚泥を
廃水処理の系外に引き抜かなくてはならず、その処分が
問題となっている。これに対し、余剰汚泥の生成量が少
ない、または余剰汚泥を全く生成しない廃水処理方法の
開発が進められている。この種の廃水処理方法の例とし
ては、返送汚泥の一部をオゾンなどの酸化剤による酸化
や、機械的破砕により可溶化し、生物分解性を高めてか
ら生物処理槽に戻し、ＣＯ2 化を促進して汚泥を減容化
するものである。However, since microorganisms and the like grown in the biological treatment tank produce surplus activated sludge, the surplus sludge must be drawn out of the wastewater treatment system, and its disposal is a problem. . On the other hand, development of a wastewater treatment method that produces little excess sludge or produces no excess sludge is underway. As an example of this type of wastewater treatment method, a part of the returned sludge is oxidized by an oxidizing agent such as ozone or solubilized by mechanical crushing to enhance biodegradability and then returned to the biotreatment tank to generate CO 2 To promote sludge reduction and reduce sludge volume.
【０００４】しかし、汚泥の可溶化の際に汚泥から難分
解性物質も同時に溶出するため、これが生物処理槽で十
分に処理されずに、処理水のＣＯＤなど、水質を悪化さ
せる欠点が指摘されている。However, when the sludge is solubilized, a hardly decomposable substance is also eluted from the sludge at the same time, so that this is not sufficiently treated in the biological treatment tank, and a drawback such as COD of treated water that deteriorates the water quality is pointed out. ing.
【０００５】処理水のＣＯＤをできるだけ悪化させない
廃水処理方法として、返送汚泥を高圧ノズル噴射する方
法が提案されている。この方法を採用した廃水処理装置
の構成を図４に示す。同図に示すように、廃水処理装置
は主として、有機性廃水を活性汚泥によって生物処理す
る生物処理槽１と、その生物処理槽１からの汚泥混合液
を固液分離する固液分離槽２とで構成されている。固液
分離槽２には、分離した活性汚泥を生物処理槽１に返送
する返送管３が接続されている。返送管３には、分配器
４が配設されており、この分配器４によって活性汚泥が
分配管５に分配される。分配管５には、高圧ポンプ６と
リアクタ７とから成る汚泥処理装置８が設けられてお
り、高圧ポンプ６で加圧した活性汚泥を、リアクタ７の
狭窄部を介して低圧部に噴射する。これにより、キャビ
テーションが発生するので、汚泥のフロックが分散化、
微細化され、有機物が分解されやすくなる。また、活性
汚泥中の菌体と有機物の接触面積が増加して菌体活性が
高くなり、生物処理槽１内での汚泥の自己酸化・分解が
促進され、汚泥の減容効果が得られる。As a wastewater treatment method which does not deteriorate the COD of treated water as much as possible, a method of injecting returned sludge into a high-pressure nozzle has been proposed. FIG. 4 shows the configuration of a wastewater treatment device that employs this method. As shown in the figure, the wastewater treatment apparatus mainly includes a biological treatment tank 1 for biologically treating organic wastewater with activated sludge, and a solid-liquid separation tank 2 for performing solid-liquid separation of a sludge mixed solution from the biological treatment tank 1. It is composed of. A return pipe 3 for returning the separated activated sludge to the biological treatment tank 1 is connected to the solid-liquid separation tank 2. A distributor 4 is arranged in the return pipe 3, and the distributor 4 distributes the activated sludge to the distribution pipe 5. The distribution pipe 5 is provided with a sludge treatment device 8 including a high-pressure pump 6 and a reactor 7, and the activated sludge pressurized by the high-pressure pump 6 is injected to the low-pressure part via the constriction part of the reactor 7. As a result, cavitation occurs, so the sludge flocs are dispersed,
It is miniaturized, and organic substances are easily decomposed. Further, the contact area between the microbial cells and the organic matter in the activated sludge is increased, the microbial cell activity is increased, the autooxidation and decomposition of the sludge in the biological treatment tank 1 are promoted, and the volume reduction effect of the sludge is obtained.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、生物処
理槽内における汚泥の自己酸化・分解率は、生物処理槽
１内の条件によって異なり、汚泥減容化の効果が十分に
得られないことがあった。However, the auto-oxidation / decomposition rate of sludge in the biological treatment tank varies depending on the conditions in the biological treatment tank 1, and the effect of reducing the sludge volume may not be sufficiently obtained. It was
【０００７】また、高圧ノズル噴射による汚泥処理は、
噴射圧力を数十ＭＰａに上昇させることで、汚泥を可溶
化できるが、実際には、高圧ポンプ６の使用都合のため
に数ＭＰａ程度にしか上昇させることができないという
問題がある。この圧力範囲では、汚泥の分散化が主な作
用となり、減容効果は２〜３％しか得られない。Further, sludge treatment by high pressure nozzle injection is
Although the sludge can be solubilized by increasing the injection pressure to several tens MPa, there is a problem that the sludge can actually be increased only to several MPa due to the convenience of use of the high-pressure pump 6. In this pressure range, the main function is to disperse the sludge, and the volume reduction effect is only 2 to 3%.
【０００８】さらに、汚泥処理した活性汚泥を生物処理
槽１に返送した際、この活性汚泥が原水中の基質分解に
よって会合し、減容効果が少なくなるおそれもあった。Further, when the activated sludge treated with sludge is returned to the biological treatment tank 1, the activated sludge may be associated with the decomposition of the substrate in the raw water to reduce the volume reducing effect.
【０００９】本発明はこのような事情に鑑みて成された
もので、汚泥の減容効果を安定して得ることができる廃
水処理装置を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wastewater treatment apparatus capable of stably obtaining the volume reduction effect of sludge.
【００１０】[0010]
【課題を解決するための手段】請求項１記載の発明は前
記目的を達成するために、有機性廃水を活性汚泥により
生物処理する生物処理槽と、該生物処理槽から流出され
る処理水と前記活性汚泥との混合液を固液分離する分離
槽と、該分離槽で分離した活性汚泥を前記生物処理槽に
返送する第１の返送路と、前記分離槽で分離した活性汚
泥を高圧ノズル噴射することにより汚泥処理して前記生
物処理槽に返送する第２の返送路と、を備えた廃水処理
装置において、前記第２の返送路に曝気槽を設け、前記
汚泥処理した活性汚泥を前記曝気槽に導入して曝気を行
うことを特徴としている。In order to achieve the above object, the invention according to claim 1 provides a biological treatment tank for biologically treating organic wastewater with activated sludge, and treated water flowing out from the biological treatment tank. A separation tank for solid-liquid separation of the mixed liquid with the activated sludge, a first return path for returning the activated sludge separated in the separation tank to the biological treatment tank, and a high-pressure nozzle for the activated sludge separated in the separation tank. In a wastewater treatment device comprising a second return passage for injecting sludge to return it to the biological treatment tank, an aeration tank is provided in the second return passage, and the activated sludge treated with the sludge is It is characterized by being introduced into the aeration tank to perform aeration.
【００１１】本発明によれば、汚泥処理した活性汚泥を
曝気槽に導入して曝気を行うようにしたので、活性汚泥
は、過曝気状態になって自己消化が促進される。したが
って、活性汚泥の減容効果を安定して得ることができ
る。According to the present invention, the activated sludge treated with sludge is introduced into the aeration tank to perform aeration, so that the activated sludge becomes over-aerated and self-extinguishing is promoted. Therefore, the volume reduction effect of the activated sludge can be stably obtained.
【００１２】請求項２記載の発明によれば、曝気槽にお
ける処理時間を３〜１２時間としたので、高い減容効果
を効率良く得ることができる。According to the second aspect of the invention, since the treatment time in the aeration tank is set to 3 to 12 hours, a high volume reducing effect can be efficiently obtained.
【００１３】[0013]
【発明の実施の形態】以下添付図面に従って、本発明に
係る廃水処理装置の好ましい実施の形態について説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a wastewater treatment apparatus according to the present invention will be described below with reference to the accompanying drawings.
【００１４】図１は、本発明に係る廃水処理装置の実施
の形態を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of a wastewater treatment apparatus according to the present invention.
【００１５】同図に示すように、廃水処理装置１０は主
として、廃水を活性汚泥と混合して生物学的に処理する
生物処理槽１２と、この生物処理槽１２から流出する汚
泥混合液を固液分離する固液分離槽１４とから構成され
る。As shown in FIG. 1, the wastewater treatment apparatus 10 mainly comprises a biological treatment tank 12 for mixing wastewater with activated sludge and biologically treating it, and a sludge mixed solution flowing out from the biological treatment tank 12. It is composed of a solid-liquid separation tank 14 for liquid separation.
【００１６】有機性廃水は、流入管１６から生物処理槽
１２に流入される。そして、この生物処理槽１２の内部
において、汚泥返送管（第１の返送路に相当）１８から
の返送汚泥、及び、曝気装置２２からの曝気エアと混合
され、好気的に生物処理される。その処理水と活性汚泥
の汚泥混合液は、生物処理槽１２から流出管２４を介し
て固液分離槽１４に流出される。そして、固液分離槽１
４の内部において、活性汚泥が沈降分離され、上澄み液
が処理水として導出管２６から導出される。なお、曝気
装置２２は、ブロア２２ａと、このブロア２２ａのエア
を散気する散気管２２ｂと、から構成されている。The organic wastewater flows into the biological treatment tank 12 through the inflow pipe 16. Then, inside the biological treatment tank 12, it is mixed with the returned sludge from the sludge return pipe (corresponding to the first return path) 18 and the aerated air from the aeration device 22, and aerobically biologically treated. . The sludge liquid mixture of the treated water and the activated sludge flows out from the biological treatment tank 12 into the solid-liquid separation tank 14 via the outflow pipe 24. And solid-liquid separation tank 1
In the inside of 4, the activated sludge is separated by sedimentation, and the supernatant liquid is discharged from the discharge pipe 26 as treated water. The aeration device 22 is composed of a blower 22a and an air diffuser 22b for diffusing the air of the blower 22a.
【００１７】一方、固液分離槽１４で沈降分離された活
性汚泥は、汚泥移送ポンプ２８を駆動することによっ
て、汚泥返送管（第１の返送路に相当）１８を介して生
物処理槽１２に返送される。On the other hand, the activated sludge settled and separated in the solid-liquid separation tank 14 is transferred to the biological treatment tank 12 through a sludge return pipe (corresponding to a first return path) 18 by driving a sludge transfer pump 28. Will be returned.
【００１８】汚泥返送管１８には、分配器３０が設けら
れており、この分配器３０によって返送汚泥が分配管３
２に分配される。分配管３２には、高圧ポンプ３４とリ
アクタ３６から成る汚泥処理装置２０が設けられてい
る。リアクタ３６には、図示しないノズル（狭窄部に相
当）と容器（低圧部に相当）が設けられており、高圧ポ
ンプ３４によって加圧された活性汚泥が、前記ノズルを
介して容器に噴射される。これにより、キャビテーショ
ンが発生し、活性汚泥が分散・微細化されるとともに、
汚泥の自己酸化・分解が促進される。このようにして汚
泥処理された活性汚泥は、処理汚泥移送管３８を介して
曝気槽４０に移送され、貯留される。曝気装置４０に
は、ブロア４２ａと散気管４２ｂから成る曝気手段４２
が設けられている。曝気槽４０に貯留された活性汚泥
は、この曝気装置４２による曝気エアによって所定時間
曝気された後、処理汚泥返送管４４を介して生物処理槽
１２に返送される。The sludge return pipe 18 is provided with a distributor 30. The distributor 30 distributes the returned sludge to the distribution pipe 3
It is divided into two. The distribution pipe 32 is provided with a sludge treatment device 20 including a high-pressure pump 34 and a reactor 36. The reactor 36 is provided with a nozzle (corresponding to a narrowed portion) and a container (corresponding to a low pressure portion) which are not shown, and activated sludge pressurized by the high pressure pump 34 is injected into the container through the nozzle. . As a result, cavitation occurs, the activated sludge is dispersed and refined, and
The auto-oxidation and decomposition of sludge is promoted. The activated sludge thus treated with sludge is transferred to and stored in the aeration tank 40 via the treated sludge transfer pipe 38. The aeration device 40 includes an aeration means 42 including a blower 42a and an air diffuser 42b.
Is provided. The activated sludge stored in the aeration tank 40 is returned to the biological treatment tank 12 via the treated sludge return pipe 44 after being aerated by the aeration air by the aeration device 42 for a predetermined time.
【００１９】なお、分配器３０は、活性処理倍率（生物
処理層１２内に保持する活性汚泥量に対する、汚泥処理
装置２０の汚泥処理量の倍率）が例えば、一日当たり
０．５〜３の範囲内になるように分配調整する。The distributor 30 has an active treatment ratio (a ratio of the sludge treatment amount of the sludge treatment device 20 to the amount of activated sludge retained in the biological treatment layer 12) of, for example, 0.5 to 3 per day. Adjust the distribution to be within.
【００２０】次に上記の如く構成された廃水処理装置１
０の作用について説明する。Next, the wastewater treatment apparatus 1 constructed as described above
The operation of 0 will be described.
【００２１】曝気槽４０には、有機性廃水の原水が流入
せず、分散・微細化した汚泥のみが流入するため、過曝
気状態となる。有機物の存在しない状態で過曝気を行う
と、分散・微細化した汚泥は自己消化されやすい。した
がって、活性汚泥の減容が促進されるので、この活性汚
泥を生物処理槽１２に移送することで、生物処理槽１２
での汚泥発生を抑制できる。The raw water of the organic wastewater does not flow into the aeration tank 40, and only the sludge that has been dispersed and refined flows into the aeration tank 40. If over-aeration is performed in the absence of organic matter, the sludge that has been dispersed and made finer is likely to be self-extinguished. Therefore, since the volume reduction of the activated sludge is promoted, by transferring this activated sludge to the biological treatment tank 12,
It is possible to suppress the generation of sludge.
【００２２】このように本実施の形態の廃水処理装置１
０は、分配管３２、処理汚泥移送管３８、処理汚泥返送
管４４から成る返送路（第２の返送路に相当）に、汚泥
処理装置２０と曝気槽４０を設けたので、汚泥処理装置
２０によって汚泥処理された活性汚泥が曝気槽４０で曝
気され、活性汚泥の自己消化が促進される。すなわち、
活性汚泥の自己消化条件を最適化することによって、汚
泥の減容効果を安定して得ることができる。As described above, the wastewater treatment apparatus 1 of this embodiment
In No. 0, the sludge treatment device 20 and the aeration tank 40 were provided in the return passage (corresponding to the second return passage) including the distribution pipe 32, the treated sludge transfer pipe 38, and the treated sludge return pipe 44. The activated sludge treated by the sludge is aerated in the aeration tank 40, and the self-digestion of the activated sludge is promoted. That is,
The volume reduction effect of sludge can be stably obtained by optimizing the self-digestion conditions of activated sludge.
【００２３】ところで、減容効果は、自己消化の時間が
長ければ長いほど大きくなる。すなわち、活性汚泥の自
己消化が促進される曝気槽４０での処理時間が長ければ
長いほど、活性汚泥の減容量は増加する。By the way, the volume-reducing effect becomes greater as the self-extinguishing time becomes longer. That is, the longer the treatment time in the aeration tank 40 in which the self-extinction of the activated sludge is promoted, the more the volume of the activated sludge is reduced.
【００２４】図２は、実験により得られた、ノズル噴射
による汚泥処理後の汚泥の汚泥減容量と処理時間との関
係を示している。汚泥減容量（％）は、２４時間後の減
容量を１００％として示されている。FIG. 2 shows the relationship between the sludge reduction capacity of the sludge after the sludge treatment by the nozzle injection and the treatment time, obtained by an experiment. Sludge volume reduction (%) is shown with 100% volume reduction after 24 hours.
【００２５】同図から分かるように、汚泥減容量は、処
理時間とともに増加している。しかし、その増加速度は
一定ではなく、開始直後が非常に小さく、開始３時間後
あたりから急激に大きくなる。このため、開始３時間未
満では、減容効果が小さく、３時間後から大きな減容効
果が得られるようになる。減容量の大幅な増加は、１２
時間後まで続き、１２時間後には約８０％が減容されて
いる。１２時間後以降は、減容量の増加速度が遅くな
り、緩やかな減容量の増加が見られる。以上の結果か
ら、曝気槽４０での処理時間を３〜１２時間の間に設定
すると、短時間で大きな減容効果が得られる。As can be seen from the figure, the sludge reduction capacity increases with the treatment time. However, the rate of increase is not constant, it is very small immediately after the start, and increases rapidly about 3 hours after the start. Therefore, if less than 3 hours after the start, the volume reduction effect is small, and after 3 hours, a large volume reduction effect can be obtained. A significant increase in volume reduction is 12
It continues until the hour, and after 12 hours, the volume has been reduced by about 80%. After 12 hours, the rate of increase in the capacity reduction becomes slow, and a gradual increase in the capacity reduction is observed. From the above results, when the treatment time in the aeration tank 40 is set to 3 to 12 hours, a large volume reducing effect can be obtained in a short time.
【００２６】なお、上述した実施の形態は、曝気槽４０
を一つのみ設けたが、これに限定するものではなく、二
つ以上の曝気槽を連続して接続するようにしてもよい。In the above-described embodiment, the aeration tank 40 is used.
Although only one is provided, the invention is not limited to this, and two or more aeration tanks may be continuously connected.
【００２７】[0027]
【実施例】廃水処理装置１０を、以下の条件で稼働させ
た。すなわち、生物処理槽１２として、容積が１．５ｍ
3 のものを使用し、曝気槽４０として容積が０．５ｍ3
のものを使用した。また、原水として、ＢＯＤ濃度を１
０００mg/Lに調整した合成原水をＢＯＤ容積負荷０．５
(kg/m 3 ・d ) の条件で連続供給した。固液分離槽１４
からの返送率は原水量に対して１００％に設定し、汚泥
処理装置２０で処理する汚泥量は返送汚泥全体の５０％
に設定した。これらの条件の下で廃水処理装置１０を稼
働させ、生物処理槽１２内の汚泥量を測定した。Example The wastewater treatment apparatus 10 was operated under the following conditions. That is, the biological treatment tank 12 has a volume of 1.5 m.
The aeration tank 40 has a volume of 0.5 m 3
I used the one. Also, as raw water, BOD concentration is 1
BOD volumetric load of synthetic raw water adjusted to 000 mg / L is 0.5
It was continuously supplied under the condition of (kg / m 3 · d). Solid-liquid separation tank 14
The rate of return from sludge is set to 100% of the amount of raw water, and the amount of sludge treated by the sludge treatment device 20 is 50% of the total amount of returned sludge
Set to. The wastewater treatment device 10 was operated under these conditions, and the amount of sludge in the biological treatment tank 12 was measured.
【００２８】また、本実施例との比較例として、図４に
示した構造の廃水処理装置を稼働させて生物処理槽１内
の汚泥量を測定した。生物処理槽１としては容積が２ｍ
3 のものを使用し、他の条件は、本実施例と同じ条件で
行った。As a comparative example to this embodiment, the wastewater treatment device having the structure shown in FIG. 4 was operated to measure the amount of sludge in the biological treatment tank 1. The volume of the biological treatment tank 1 is 2 m
3 was used, and the other conditions were the same as those in this example.
【００２９】上述した実施例、及び比較例で得られた汚
泥量の経日変化を図３に示す。FIG. 3 shows the change with time in the amount of sludge obtained in the above-mentioned Examples and Comparative Examples.
【００３０】同図に示すように、比較例では、汚泥量が
７．０(kg-乾燥重量) から徐々に増加し、３０日後には
９．１(kg-乾燥重量) になった。これを一日あたりに換
算すると、約１％／日増加していることになる。これに
対し、本実施例では、汚泥量の増加が小さく、３０日後
の汚泥量が７．３(kg-乾燥重量) であった。これを一日
あたりに換算すると、約０．１４％／日しか、増加しな
いことが分かる。なお、本実施例において、曝気槽４０
の内部の汚泥濃度は、流入汚泥濃度約１００００mg/Lに
対して、９２００mg/Lであり、約８％の減容が見られ
た。As shown in the figure, in the comparative example, the amount of sludge gradually increased from 7.0 (kg-dry weight) to 9.1 (kg-dry weight) after 30 days. Converting this per day, it means an increase of about 1% / day. On the other hand, in this example, the increase in the amount of sludge was small, and the amount of sludge after 30 days was 7.3 (kg-dry weight). Converting this per day, it can be seen that it increases by only about 0.14% / day. In the present embodiment, the aeration tank 40
The sludge concentration inside was 9200 mg / L with respect to the inflow sludge concentration of about 10,000 mg / L, and a volume reduction of about 8% was observed.
【００３１】[0031]
【発明の効果】以上説明したように、本発明の廃水処理
装置によれば、汚泥処理した活性汚泥を曝気槽に導入し
て曝気を行うようにしたので、活性汚泥は、過曝気状態
になって自己消化が促進される。すなわち、活性汚泥の
自己消化条件を最適化することにより、汚泥減容効果を
安定して得ることができる。As described above, according to the wastewater treatment apparatus of the present invention, the sludge-treated activated sludge is introduced into the aeration tank to perform aeration, so that the activated sludge becomes over-aerated. Self-digestion is promoted. That is, the sludge volume reduction effect can be stably obtained by optimizing the self-digestion condition of the activated sludge.
【図１】本発明に係る廃水処理装置の実施の形態を説明
する構成図FIG. 1 is a configuration diagram illustrating an embodiment of a wastewater treatment device according to the present invention.
【図２】曝気槽における処理時間と汚泥減容量の関係を
示す図FIG. 2 is a diagram showing the relationship between the treatment time and the sludge reduction capacity in the aeration tank.
【図３】汚泥量の経日変化を示す図FIG. 3 is a diagram showing a daily change in the amount of sludge.
【図４】従来の廃水処理装置を説明する構成図FIG. 4 is a configuration diagram illustrating a conventional wastewater treatment device.
１０…廃水処理装置、１２…生物処理層、１４…固液分
離槽、１６…流入管、１８…汚泥返送管、２０…汚泥処
理装置、２２、４２…曝気装置、２４…流出管、２６…
導出管、２８…汚泥移送ポンプ、３０…分配器、３２…
分配管、３４…高圧ポンプ、３６…リアクタ、３８…処
理汚泥移送管、４０…曝気槽、４４…処理汚泥返送管10 ... Wastewater treatment device, 12 ... Biological treatment layer, 14 ... Solid-liquid separation tank, 16 ... Inflow pipe, 18 ... Sludge return pipe, 20 ... Sludge treatment device, 22, 42 ... Aeration device, 24 ... Outflow pipe, 26 ...
Outlet pipe, 28 ... Sludge transfer pump, 30 ... Distributor, 32 ...
Distribution pipe, 34 ... High-pressure pump, 36 ... Reactor, 38 ... Treated sludge transfer pipe, 40 ... Aeration tank, 44 ... Treated sludge return pipe
フロントページの続き Ｆターム(参考） 4D028 BD00 BD11 4D059 AA05 BA03 BK12 CA28 EB16Continued front page F-term (reference) 4D028 BD00 BD11 4D059 AA05 BA03 BK12 CA28 EB16
Claims (2)
生物処理槽と、 該生物処理槽から流出される処理水と前記活性汚泥との
混合液を固液分離する分離槽と、 該分離槽で分離した活性汚泥を前記生物処理槽に返送す
る第１の返送路と、 前記分離槽で分離した活性汚泥を高圧ノズル噴射するこ
とにより汚泥処理して前記生物処理槽に返送する第２の
返送路と、 を備えた廃水処理装置において、 前記第２の返送路に曝気槽を設け、前記汚泥処理した活
性汚泥を前記曝気槽に導入して曝気を行うことを特徴と
する廃水処理装置。1. A biological treatment tank for biologically treating organic wastewater with activated sludge, a separation tank for performing solid-liquid separation of a mixed liquid of the treated water discharged from the biological treatment tank and the activated sludge, and the separation tank. First return path for returning the activated sludge separated in step 1 to the biological treatment tank, and second return for returning the activated sludge separated in the separation tank to the biological treatment tank by high-pressure nozzle injection A wastewater treatment device comprising a passage, and an aeration tank is provided in the second return passage, and the activated sludge treated with the sludge is introduced into the aeration tank to perform aeration.
間に設定することを特徴とする請求項１記載の廃水処理
装置。2. The wastewater treatment apparatus according to claim 1, wherein the treatment time in the aeration tank is set to 3 to 12 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001236087A JP2003047986A (en) | 2001-08-03 | 2001-08-03 | Wastewater treatment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001236087A JP2003047986A (en) | 2001-08-03 | 2001-08-03 | Wastewater treatment apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003047986A true JP2003047986A (en) | 2003-02-18 |
Family
ID=19067425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001236087A Pending JP2003047986A (en) | 2001-08-03 | 2001-08-03 | Wastewater treatment apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003047986A (en) |
-
2001
- 2001-08-03 JP JP2001236087A patent/JP2003047986A/en active Pending
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