JP2015073950A - Organic waste water treatment plant, and method for operating the same - Google Patents

Organic waste water treatment plant, and method for operating the same Download PDF

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JP2015073950A
JP2015073950A JP2013212088A JP2013212088A JP2015073950A JP 2015073950 A JP2015073950 A JP 2015073950A JP 2013212088 A JP2013212088 A JP 2013212088A JP 2013212088 A JP2013212088 A JP 2013212088A JP 2015073950 A JP2015073950 A JP 2015073950A
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tank
centrifugal
sludge
returned
concentrator
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啓介 ▲瀬▼戸
啓介 ▲瀬▼戸
Keisuke Seto
正司 松本
Masaji Matsumoto
正司 松本
恒明 小林
Tsuneaki Kobayashi
恒明 小林
弘 山田
Hiroshi Yamada
弘 山田
照久 朝倉
Teruhisa Asakura
照久 朝倉
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KOBELCO ECO MAINTENANCE CO Ltd
KOBELCO ECO-MAINTENANCE CO Ltd
Shinko Pantec Co Ltd
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KOBELCO ECO MAINTENANCE CO Ltd
KOBELCO ECO-MAINTENANCE CO Ltd
Kobelco Eco Solutions Co Ltd
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    • 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

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Abstract

PROBLEM TO BE SOLVED: To provide an organic waste water treatment plant that comprises a centrifugal concentrator or centrifugal dewaterer, and that can reduce immixing of a sludge into return water and suppress phosphorus concentration increase in the effluent water, and to provide a method for operating the same.SOLUTION: A method for operating an organic waste water treatment plant, includes: during start-up of a centrifugal concentrator, start-up discharge water is returned to an excess sludge tank; when comprising also a centrifugal dewaterer, during the start-up of the centrifugal dewaterer, the start-up discharge water is returned to a mixed sludge tank; and after the centrifugal concentrator or centrifugal dewaterer has reached a steady state, the separated water from the centrifugal concentrator or centrifugal separator is returned to the upstream side of a biological treatment tank. By returning the start-up discharge water from the centrifugal concentrator or centrifugal dewaterer at the start-up to the excess sludge tank or mixed sludge tank, said excess sludge having immixed the start-up discharge water can efficiently be immobilized as a dewatered cake during a steady state operation and increase of phosphorus concentration in the effluent water can be prevented.

Description

本発明は、生物処理槽の余剰汚泥を貯留する余剰汚泥槽と、濃縮するための遠心濃縮機又は遠心脱水機と、遠心濃縮機又は遠心脱水機の分離水を汚泥貯留槽へと返送するための返送経路とを備える下水処理施設のような有機性廃水処理施設、及びその運転方法に関する。   The present invention provides an excess sludge tank for storing excess sludge in a biological treatment tank, a centrifugal concentrator or centrifugal dehydrator for concentrating, and returning separated water from the centrifugal concentrator or centrifugal dehydrator to a sludge storage tank. The present invention relates to an organic wastewater treatment facility such as a sewage treatment facility provided with a return path and a method for operating the same.

図２は、一般的な下水処理施設における処理フローを示す。下水処理施設では、下水管から送られてきた下水を沈砂池２１に供給し、砂又は土のような大きな固形物が除去される。大きな固形物が除去された下水は、分配槽（分水槽）２２へと供給された後、接続されている複数の最初沈殿池１にゆっくり流され、細かい汚れ（固形物等）が沈殿及び分離される。底にたまった固形物（初沈汚泥）は、経路２３を経て重力濃縮槽６へと供給されて、濃縮された後、さらに経路２４を経て汚泥処理施設４の混合汚泥槽１６へと送られる。重力濃縮槽６が設けられない場合もある。最初沈殿池１の前処理として、沈砂池と呼ばれる池で、大きなゴミ（布きれ又は土砂等）を取り除く場合もある。最初沈殿池１で固形物等を除去された被処理水は、生物処理槽２（曝気槽のような好気的生物処理槽又はメタン発酵槽のような嫌気的生物処理槽）へと送られ、生物学的処理によって有機物が分解される。   FIG. 2 shows a processing flow in a general sewage treatment facility. In the sewage treatment facility, sewage sent from the sewage pipe is supplied to the settling basin 21 to remove large solids such as sand or soil. The sewage from which large solids have been removed is supplied to a distribution tank (split tank) 22 and then slowly flows to a plurality of connected first settling basins 1 to precipitate and separate fine dirt (solids etc.). Is done. The solid matter (primary sedimentation sludge) accumulated at the bottom is supplied to the gravity concentration tank 6 via the path 23, concentrated, and further sent to the mixed sludge tank 16 of the sludge treatment facility 4 via the path 24. . The gravity concentration tank 6 may not be provided. As a pretreatment of the first sedimentation basin 1, a large trash (cloth scrap or earth and sand) may be removed in a pond called a sedimentation basin. The treated water from which solids and the like are first removed in the sedimentation tank 1 is sent to a biological treatment tank 2 (an aerobic biological treatment tank such as an aeration tank or an anaerobic biological treatment tank such as a methane fermentation tank). Organic matter is decomposed by biological treatment.

生物処理槽２が曝気槽である場合には、下水の中に活性汚泥を入れ、空気を吹き込みながら6時間〜8時間程度撹拌し、含有されている有機物が、好気性微生物によって水及び炭酸ガス等に分解される。繁殖した好気性微生物の周りには、細かい浮遊物が付着して、沈殿しやすい塊（フロック）となる。曝気槽２から取り出された処理水は、最終沈殿池３へと移送され、2時間程度かけてゆっくり流される間に、生物処理槽２でできた塊を余剰汚泥として沈殿させる。最終沈殿池３の上澄水は、塩素混和池５において塩素消毒された後、河川に放流される。   When the biological treatment tank 2 is an aeration tank, put activated sludge into the sewage and stir for about 6 to 8 hours while blowing air, and the contained organic matter is water and carbon dioxide by aerobic microorganisms. Etc. Fine suspended matter adheres around the propagated aerobic microorganisms to form a lump (floc) that tends to settle. The treated water taken out from the aeration tank 2 is transferred to the final settling basin 3 and settles as a surplus sludge in the biological treatment tank 2 while flowing slowly over about 2 hours. The supernatant water of the final sedimentation basin 3 is discharged into the river after being sterilized by chlorine in the chlorine mixing basin 5.

最終沈殿池３から回収された余剰汚泥の一部は、生物処理槽２へと返送され（返送汚泥）、残部は、汚泥処理施設４へと送られる。特許文献１は、曝気槽２に汚泥の一部を返送する際、酸化剤注入手段を設けることを開示している。汚泥処理施設４には、遠心濃縮機７及び／又は遠心脱水機８が設けられており、初沈汚泥及び余剰汚泥から水分を分離させ、固形状の脱水ケーキへと変化させる。   Part of the excess sludge collected from the final sedimentation basin 3 is returned to the biological treatment tank 2 (return sludge), and the remaining part is sent to the sludge treatment facility 4. Patent document 1 is disclosing providing an oxidizing agent injection | pouring means when returning a part of sludge to the aeration tank 2. FIG. The sludge treatment facility 4 is provided with a centrifugal concentrator 7 and / or a centrifugal dehydrator 8, which separates moisture from the primary sedimentation sludge and excess sludge and changes it into a solid dehydrated cake.

遠心濃縮機７へと供給される余剰汚泥は、最終沈殿池３から第一供給経路１４を経て余剰汚泥槽１０に一旦貯留される構造となっている。余剰汚泥槽１０内に貯留された余剰汚泥は、第二供給経路１５を経て、遠心濃縮機１０へと供給される。遠心濃縮機７から取り出される濃縮汚泥は、経路２５を経て混合汚泥槽１６へと供給され、初沈汚泥と混合されて混合汚泥となる。この混合汚泥は、経路２６（第四供給経路）を経て遠心脱水機８へと供給される。   The surplus sludge supplied to the centrifugal concentrator 7 is temporarily stored in the surplus sludge tank 10 from the final sedimentation tank 3 via the first supply path 14. The excess sludge stored in the excess sludge tank 10 is supplied to the centrifugal concentrator 10 via the second supply path 15. The concentrated sludge taken out from the centrifugal concentrator 7 is supplied to the mixed sludge tank 16 via the path 25 and mixed with the first settling sludge to become mixed sludge. This mixed sludge is supplied to the centrifugal dehydrator 8 via a path 26 (fourth supply path).

遠心脱水機８から取り出された脱水ケーキは、汚泥焼却炉へと送られ、焼却処理される。図２においては、遠心濃縮機７で一次脱水した濃縮汚泥を、さらに遠心脱水機８で二次脱水する構成となっているが、どちらか一方の脱水手段だけであってもよい。   The dehydrated cake taken out from the centrifugal dehydrator 8 is sent to a sludge incinerator and incinerated. In FIG. 2, the concentrated sludge primarily dehydrated by the centrifugal concentrator 7 is further subjected to secondary dehydration by the centrifugal dehydrator 8, but only one of the dehydrating means may be used.

遠心濃縮機７から排出される分離水は、経路１１及び経路１２を経て、生物処理槽２の上流側へと返送される。図２では、経路１２ａによって分配槽（分水槽）２２に返送され、経路１２ｂによって最初沈殿池１へと返送される構成となっている。同様に、遠心脱水機８から排出される分離水は、経路１８を経て、生物処理槽２の上流側へと返送される。図２では、経路１８ａによって分配槽（分水槽）２２に返送され、経路１８ｂによって最初沈殿池１へと返送される構成となっている。   The separated water discharged from the centrifugal concentrator 7 is returned to the upstream side of the biological treatment tank 2 via the path 11 and the path 12. In FIG. 2, it returns to the distribution tank (water-dividing tank) 22 by the path | route 12a, and is returned to the first sedimentation tank 1 by the path | route 12b. Similarly, the separated water discharged from the centrifugal dehydrator 8 is returned to the upstream side of the biological treatment tank 2 via the path 18. In FIG. 2, it returns to the distribution tank (water-dividing tank) 22 by the path | route 18a, and is returned to the first sedimentation tank 1 by the path | route 18b.

実開平１−１５６７９９号公報Japanese Utility Model Publication 1-156799

最終沈殿池３から回収され、汚泥処理施設４へと供給される余剰汚泥は、余剰汚泥槽に一旦貯留され、遠心濃縮機７及び遠心脱水機８へと供給される。図２では、汚泥処理施設４に遠心濃縮機７及び遠心脱水機８が設けられているが、どちらか一方だけでもよい。遠心濃縮機７及び遠心脱水機８には、定格流量が決まっており、余剰汚泥槽から余剰汚泥を定格流量で送り、遠心濃縮機７及び遠心脱水機８で脱水処理することが通常である。   The surplus sludge collected from the final sedimentation basin 3 and supplied to the sludge treatment facility 4 is temporarily stored in a surplus sludge tank and supplied to the centrifugal concentrator 7 and the centrifugal dehydrator 8. Although the centrifugal concentrator 7 and the centrifugal dehydrator 8 are provided in the sludge treatment facility 4 in FIG. 2, only one of them may be used. The centrifugal concentrator 7 and the centrifugal dehydrator 8 have predetermined rated flow rates, and it is usual to send excess sludge from the surplus sludge tank at the rated flow rate and perform dehydration treatment with the centrifugal concentrator 7 and the centrifugal dehydrator 8.

遠心濃縮機７及び遠心脱水機８は、通常、複数台設置される。余剰汚泥槽に貯留される余剰汚泥量が遠心濃縮機７及び遠心脱水機８の処理能力以下であれば、１台の遠心濃縮機７及び／又は遠心脱水機８を運転する。一方、余剰汚泥槽に貯留される余剰汚泥量が遠心濃縮機７及び遠心脱水機８の処理能力を超えれば、複数台の遠心濃縮機７及び遠心脱水機８を運転する。遠心濃縮機７及び遠心脱水機８によって分離された水分は、返流水として生物処理槽２の上流側へと返送されることが一般的である。   A plurality of centrifugal concentrators 7 and centrifugal dehydrators 8 are usually installed. If the amount of excess sludge stored in the excess sludge tank is less than the processing capacity of the centrifugal concentrator 7 and the centrifugal dehydrator 8, one centrifugal concentrator 7 and / or centrifugal dehydrator 8 is operated. On the other hand, if the amount of excess sludge stored in the excess sludge tank exceeds the processing capacity of the centrifugal concentrator 7 and the centrifugal dehydrator 8, a plurality of centrifugal concentrators 7 and centrifugal dehydrators 8 are operated. The water separated by the centrifugal concentrator 7 and the centrifugal dehydrator 8 is generally returned to the upstream side of the biological treatment tank 2 as return water.

ところが、遠心濃縮機７又は遠心脱水機８の起動時は、脱水能力が低い、又は余剰汚泥が濃縮されずに返流されるシーケンスのため、余剰汚泥の一部がそのまま返流水に混入してしまう。そのため、分離水を生物処理槽の上流側（分配槽（分水槽）２２又は最初沈殿池１へと返送することが一般的である）に返送しても、通常供給されているBOD量では、後続する生物処理槽内の好気的生物処理又は嫌気的生物処理におけるリンの除去率が低下する。その結果、河川に放流される最終沈殿池３の上澄水中のリン濃度が上昇してしまうことが判明した。   However, when the centrifugal concentrator 7 or the centrifugal dehydrator 8 is started, since the dewatering capacity is low or the surplus sludge is returned without being concentrated, a part of the surplus sludge is mixed into the return water as it is. End up. Therefore, even if the separated water is returned to the upstream side of the biological treatment tank (generally returned to the distribution tank (dividing tank) 22 or the first settling tank 1), The phosphorus removal rate in the subsequent aerobic biological treatment or anaerobic biological treatment in the biological treatment tank is reduced. As a result, it was found that the phosphorus concentration in the supernatant water of the final sedimentation basin 3 discharged into the river increased.

本発明は、生物処理槽から発生する余剰汚泥を遠心濃縮機によって固液分離する有機性廃水処理施設であって、返流水中への汚泥の混入を減少させ、放流水のリン濃度上昇を抑制し得る有機性廃水処理施設の提供、及びそのような有機性廃水処理施設の運転方法の提供を目的とする。   The present invention is an organic wastewater treatment facility for solid-liquid separation of excess sludge generated from a biological treatment tank using a centrifugal concentrator, which reduces the mixing of sludge into the return water and suppresses an increase in phosphorus concentration in the discharged water An object is to provide an organic wastewater treatment facility that can be used, and to provide a method for operating such an organic wastewater treatment facility.

本発明者等は、遠心濃縮機又は遠心脱水機を起動させた際には、分離水を生物処理槽の上流側ではなく余剰汚泥槽へと返送し、遠心濃縮機又は遠心脱水機が定常運転となった後で、遠心濃縮機又は遠心脱水機によって固液分離すれば、分離水に混入した（リン成分を含有する）余剰汚泥を濃縮汚泥又は脱水ケーキとして効率よく除去し、河川に放流される放流水のリン濃度上昇を防止し得ることを見出し、本発明を完成させるに至った。   When starting the centrifugal concentrator or the centrifugal dehydrator, the inventors return the separated water not to the upstream side of the biological treatment tank but to the surplus sludge tank, so that the centrifugal concentrator or the centrifugal dehydrator operates in a steady state. After that, if solid-liquid separation is performed with a centrifugal concentrator or centrifugal dehydrator, excess sludge mixed in the separated water (containing phosphorus components) is efficiently removed as concentrated sludge or dehydrated cake and released into the river. The present inventors have found that it is possible to prevent an increase in the phosphorus concentration of the discharged water.

具体的に、本発明は、
生物処理槽と、
生物処理槽で発生する余剰汚泥を貯留する余剰汚泥槽と、
余剰汚泥槽に貯留された余剰汚泥を濃縮するための遠心濃縮機と、
を備える有機性廃水処理施設の運転方法であって、
（ａ）遠心濃縮機の起動時には、遠心濃縮機の起動時排水を余剰汚泥槽へと返送し、
（ｂ）遠心濃縮機の定常運転時には、遠心濃縮機の分離水を生物処理槽の上流側へと返送する、
ことを特徴とする運転方法に関する。 Specifically, the present invention
A biological treatment tank;
An excess sludge tank for storing excess sludge generated in the biological treatment tank;
A centrifugal concentrator for concentrating the excess sludge stored in the excess sludge tank;
A method for operating an organic wastewater treatment facility comprising:
(A) At the start of the centrifugal concentrator, the waste water at the start of the centrifugal concentrator is returned to the excess sludge tank,
(B) During the steady operation of the centrifugal concentrator, the separated water of the centrifugal concentrator is returned to the upstream side of the biological treatment tank.
It is related with the driving | operation method characterized by this.

本発明はまた、
生物処理槽と、
生物処理槽で発生する余剰汚泥を貯留する余剰汚泥槽と、
余剰汚泥槽に貯留された余剰汚泥を濃縮するための遠心濃縮機と、
生物処理槽で発生した余剰汚泥を余剰汚泥槽へと供給する第一供給経路と、
余剰汚泥槽内の余剰汚泥を遠心濃縮機へと供給する第二供給経路と、
遠心濃縮機の分離水を生物処理槽の上流側へと返送する第一返送経路と、
遠心濃縮機の分離水を余剰汚泥槽へと返送する第二返送経路と、
を備え、
（ａ）遠心濃縮機の起動時には、遠心濃縮機の起動時排水を第二返送経路から余剰汚泥槽へと返送し、
（ｂ）遠心濃縮機の定常運転時には、遠心濃縮機の分離水を第一返送経路から生物処理槽の上流側へと返送する、
ことを特徴とする有機性廃水処理施設に関する。 The present invention also provides
A biological treatment tank;
An excess sludge tank for storing excess sludge generated in the biological treatment tank;
A centrifugal concentrator for concentrating the excess sludge stored in the excess sludge tank;
A first supply path for supplying surplus sludge generated in the biological treatment tank to the surplus sludge tank;
A second supply path for supplying excess sludge in the excess sludge tank to the centrifugal concentrator;
A first return path for returning the separated water of the centrifugal concentrator to the upstream side of the biological treatment tank;
A second return path for returning the separated water of the centrifugal concentrator to the excess sludge tank;
With
(A) At the start of the centrifugal concentrator, the waste water at the start of the centrifugal concentrator is returned from the second return path to the excess sludge tank,
(B) During steady operation of the centrifugal concentrator, the separated water of the centrifugal concentrator is returned from the first return path to the upstream side of the biological treatment tank.
The present invention relates to an organic wastewater treatment facility.

本発明においては、遠心濃縮機の起動時には、分離水を第二返送経路から余剰汚泥槽へと返送する。その一方、遠心濃縮機の定常運転時には、分離水を第一返送経路から生物処理槽の上流側へと返送する。遠心濃縮機の定常運転時における分離水の処理方法は、従来の有機性廃水処理施設における処理方法と同じであるが、分離水中のリン濃度が高くなる遠心濃縮機の起動時には、余剰汚泥槽へと起動時排水を返送する。その結果、リン成分は、遠心濃縮機の定常運転時に脱水ケーキとして固定化され、放流水（最終処理水）中のリン濃度の上昇が抑制される。   In the present invention, when the centrifugal concentrator is activated, the separated water is returned from the second return path to the excess sludge tank. On the other hand, during steady operation of the centrifugal concentrator, the separated water is returned from the first return path to the upstream side of the biological treatment tank. The treatment method of the separated water during the steady operation of the centrifugal concentrator is the same as the treatment method in the conventional organic wastewater treatment facility. And return the drainage at startup. As a result, the phosphorus component is immobilized as a dehydrated cake during steady operation of the centrifugal concentrator, and an increase in the phosphorus concentration in the discharged water (final treated water) is suppressed.

ここで、遠心濃縮機（又は遠心脱水機）の起動時とは、遠心濃縮機（又は遠心脱水機）の運転開始直後であって、分離水の性状が安定していない状態か、又は余剰汚泥が濃縮されずに返流される状態であるときを意味する。また、遠心濃縮機（又は遠心脱水機）の定常運転時とは、遠心濃縮機（又は遠心脱水機）から排出される分離水の性状が安定化している状態であるときを意味する。本発明における「起動時排水」とは、遠心濃縮機（又は遠心脱水機）を起動してから、分離水の性状が安定するまでに遠心濃縮機から出てくる排水を意味する。   Here, when the centrifugal concentrator (or centrifugal dehydrator) is started, it is immediately after the start of the operation of the centrifugal concentrator (or centrifugal dehydrator) and the state of the separated water is not stable or excess sludge. Means when the water is returned without being concentrated. Further, the steady operation of the centrifugal concentrator (or centrifugal dehydrator) means a state in which the properties of the separated water discharged from the centrifugal concentrator (or centrifugal dehydrator) are in a stable state. The “drainage at start-up” in the present invention means drainage discharged from the centrifugal concentrator after the centrifugal concentrator (or centrifugal dehydrator) is started until the properties of the separated water are stabilized.

遠心濃縮機の分離水は、当初第二返送経路から汚泥貯留槽へと返送するが、遠心濃縮機の定常運転時には、分離水出口側の返送経路を切り替え、第一返送経路から生物処理槽の上流側へと返送する。遠心濃縮機（又は遠心脱水機）が定常運転となっているか否かは、分離水のSS濃度（固形分濃度）の測定によって確認することが可能である。   The separation water of the centrifugal concentrator is initially returned from the second return path to the sludge storage tank, but during the steady operation of the centrifugal concentrator, the return path on the outlet side of the separation water is switched and the first return path is used for the biological treatment tank. Return to the upstream side. Whether or not the centrifugal concentrator (or centrifugal dehydrator) is in a steady operation can be confirmed by measuring the SS concentration (solid content concentration) of the separated water.

本発明の運転方法においては、
前記有機性廃水処理施設が
最初沈殿池と、
最初沈殿池で発生する初沈汚泥と前記遠心濃縮機から取り出される濃縮汚泥とを貯留する混合汚泥槽と、
混合汚泥槽に貯留された初沈汚泥及び濃縮汚泥の混合汚泥を脱水する遠心脱水機と、
をさらに備え、
（ｃ）遠心脱水機の起動時には、遠心脱水機の起動時排水を混合汚泥槽へと返送し、
（ｄ）遠心脱水機の定常運転時には、遠心脱水機の分離水を生物処理槽の上流側へと返送することが好ましい。 In the operation method of the present invention,
The organic wastewater treatment facility is the first settling basin,
A mixed sludge tank for storing the first settling sludge generated in the first settling basin and the concentrated sludge taken out from the centrifugal concentrator;
A centrifugal dehydrator for dewatering the mixed sludge of the first settling sludge and concentrated sludge stored in the mixed sludge tank;
Further comprising
(C) At the time of starting the centrifugal dehydrator, the waste water at the start of the centrifugal dehydrator is returned to the mixed sludge tank,
(D) During the steady operation of the centrifugal dehydrator, it is preferable to return the separated water of the centrifugal dehydrator to the upstream side of the biological treatment tank.

また、本発明の有機性廃水処理施設は、
最初沈殿池と、
最初沈殿池で発生する初沈汚泥と前記遠心濃縮機から取り出される濃縮汚泥とを貯留する混合汚泥槽と、
混合汚泥槽に貯留された初沈汚泥及び濃縮汚泥の混合汚泥を脱水する遠心脱水機と、
最初沈殿池で発生する初沈汚泥を混合汚泥槽へと供給する第三供給経路と、
混合汚泥槽に貯留された混合汚泥を遠心脱水機へと供給する第四供給経路と、
遠心脱水機の分離水を生物処理槽の上流側へと返送する第三返送経路と、
遠心脱水機の分離水を混合汚泥槽へと返送する第四返送経路と、
をさらに備え、
（ｃ）遠心脱水機の起動時には、遠心脱水機の起動時排水を第四返送経路から混合汚泥槽へと返送し、
（ｄ）遠心脱水機の定常運転時には、遠心脱水機の分離水を第三返送経路から生物処理槽の上流側へと返送することが好ましい。 In addition, the organic wastewater treatment facility of the present invention,
First settling basin,
A mixed sludge tank for storing the first settling sludge generated in the first settling basin and the concentrated sludge taken out from the centrifugal concentrator;
A centrifugal dehydrator for dewatering the mixed sludge of the first settling sludge and concentrated sludge stored in the mixed sludge tank;
A third supply path for supplying the first settling sludge generated in the first settling basin to the mixed sludge tank;
A fourth supply path for supplying the mixed sludge stored in the mixed sludge tank to the centrifugal dehydrator;
A third return path for returning the separated water of the centrifugal dehydrator to the upstream side of the biological treatment tank;
A fourth return path for returning the separated water of the centrifugal dehydrator to the mixed sludge tank;
Further comprising
(C) At the start of the centrifugal dehydrator, the waste water at the start of the centrifugal dehydrator is returned from the fourth return path to the mixed sludge tank,
(D) At the time of steady operation of the centrifugal dehydrator, it is preferable to return the separated water of the centrifugal dehydrator from the third return path to the upstream side of the biological treatment tank.

遠心濃縮機から取り出された濃縮汚泥は、混合汚泥槽において初沈汚泥と混合されて混合汚泥となる。混合汚泥を遠心脱水機によって脱水する場合にも、遠心脱水機の起動時に起動時排水を生物処理槽の上流側に返送すると、後続する生物処理槽内の好気的生物処理又は嫌気的生物処理におけるリンの除去率が低下する。遠心脱水機の起動時には、遠心脱水機の起動時排水を第四返送経路から混合汚泥槽へと返送し、遠心脱水機の定常運転時には、遠心脱水機の分離水を第三返送経路から生物処理槽の上流側へと返送するようにすれば、後続する生物処理槽内の好気的生物処理又は嫌気的生物処理におけるリンの除去率の低下を防止し得る。   The concentrated sludge taken out from the centrifugal concentrator is mixed with the first settling sludge in the mixed sludge tank to become mixed sludge. Even when mixed sludge is dewatered by a centrifugal dehydrator, if the waste water at startup is returned to the upstream side of the biological treatment tank when the centrifugal dehydrator is activated, the subsequent aerobic or anaerobic biological treatment in the biological treatment tank The removal rate of phosphorus is reduced. When the centrifugal dehydrator starts up, the waste water at the start of the centrifugal dehydrator is returned to the mixed sludge tank from the fourth return path, and during the steady operation of the centrifugal dehydrator, the separated water from the centrifugal dehydrator is biologically processed from the third return path. By returning to the upstream side of the tank, it is possible to prevent a decrease in phosphorus removal rate in the subsequent aerobic biological treatment or anaerobic biological treatment in the biological treatment tank.

本発明の運転方法によれば、下水処理施設のような有機性廃水処理施設における放流水のリン濃度上昇を効果的に抑制し得る。   According to the operation method of the present invention, an increase in the phosphorus concentration of discharged water in an organic wastewater treatment facility such as a sewage treatment facility can be effectively suppressed.

本発明の有機性廃水処理施設の構成を示す概念図を示す。The conceptual diagram which shows the structure of the organic waste water treatment facility of this invention is shown. 一般的な下水処理施設における処理フローを示す。The processing flow in a general sewage treatment facility is shown.

本発明の実施の形態について、適宜図面を参酌しながら説明する。本発明は、以下の記載に限定されない。   Embodiments of the present invention will be described with reference to the drawings as appropriate. The present invention is not limited to the following description.

図１は、本発明の有機性廃水処理施設の構成を示す概念図を示す。図１に示される有機性廃水処理施設の基本的構成は、図２に示される下水処理施設と同じである。図１に示される有機性廃水処理施設においても、遠心濃縮機７の定常運転時には、遠心濃縮機７から排出される分離水は、経路１１→返送経路１２（第二返送経路）→経路１２ａ及び１２ｂ→分配槽２２又は最初沈殿池１へと返送される。しかし、図１に示される有機性廃水処理施設は、経路１１→返送経路１３（第一返送経路）→余剰汚泥槽１０へと返送される経路も有する。   FIG. 1 is a conceptual diagram showing the configuration of the organic wastewater treatment facility of the present invention. The basic configuration of the organic wastewater treatment facility shown in FIG. 1 is the same as that of the sewage treatment facility shown in FIG. Also in the organic wastewater treatment facility shown in FIG. 1, during steady operation of the centrifugal concentrator 7, the separated water discharged from the centrifugal concentrator 7 is route 11 → return route 12 (second return route) → route 12a and 12b → returned to distribution tank 22 or first settling basin 1 However, the organic wastewater treatment facility shown in FIG. 1 also has a route that is returned to the route 11 → the return route 13 (first return route) → the surplus sludge tank 10.

また、図１に示される有機性廃水処理施設においても、遠心脱水機８の定常運転時には、遠心脱水機８から排出される分離水は、経路１７→経路１８（第三返送経路）→経路１８ａ及び１８ｂ→分配槽２２又は最初沈殿池１へと返送される。しかし、図１に示される有機性廃水処理施設は、経路１７→返送経路１９（第四返送経路）→混合汚泥槽１６へと返送される経路も有する。   Also in the organic wastewater treatment facility shown in FIG. 1, during the steady operation of the centrifugal dehydrator 8, the separated water discharged from the centrifugal dehydrator 8 is route 17 → route 18 (third return route) → route 18a. And 18b → returned to the distribution tank 22 or first settling tank 1. However, the organic wastewater treatment facility shown in FIG. 1 also has a route that is returned to the route 17 → the return route 19 (fourth return route) → the mixed sludge tank 16.

すなわち、図１に示される有機性廃水処理施設においては、遠心濃縮機７から排出される分離水は、（ａ）遠心濃縮機７の起動時には、経路１１→返送経路１３（第一返送経路）→余剰汚泥槽１０という経路で余剰汚泥槽へと返送され、（ｂ）遠心濃縮機７の定常運転時には、経路１１→返送経路１２（第二返送経路）→分配槽２２又は最初沈殿池１という経路で返送される。同様に、図１に示される有機性廃水処理施設においては、遠心脱水機８から排出される分離水は、（ｃ）遠心脱水機８の起動時には、経路１７→返送経路１９（第四返送経路）→混合汚泥槽１６という経路で混合汚泥槽へと返送され、（ｄ）遠心脱水機８の定常運転時には、経路１７→返送経路１８（第三返送経路）→分配槽２２又は最初沈殿池１という経路で返送される。   That is, in the organic wastewater treatment facility shown in FIG. 1, the separated water discharged from the centrifugal concentrator 7 is (a) when the centrifugal concentrator 7 is activated, the path 11 → the return path 13 (first return path). → Returned to the excess sludge tank through the route of the excess sludge tank 10, (b) During steady operation of the centrifugal concentrator 7, the route 11 → return route 12 (second return route) → the distribution tank 22 or the first sedimentation tank 1 Returned by route. Similarly, in the organic wastewater treatment facility shown in FIG. 1, the separated water discharged from the centrifugal dehydrator 8 is (c) when the centrifugal dehydrator 8 is started, the route 17 → the return route 19 (fourth return route). ) → The mixed sludge tank 16 is returned to the mixed sludge tank. (D) During the steady operation of the centrifugal dehydrator 8, the path 17 → the return path 18 (third return path) → the distribution tank 22 or the first sedimentation tank 1 Will be returned.

経路１１及び経路１７を流通する分離水のSS濃度を測定することにより、分離水の性状が安定しているか否かを確認し得る。遠心濃縮機７又は遠心脱水機８の起動直後であって分離水の性状が安定していない間は、余剰汚泥が混入してリン濃度の高い分離水を余剰汚泥槽１０又は混合汚泥槽１６へと返送すれば、放流水のリン濃度は上昇しない。遠心濃縮機７及び遠心脱水機８が定常運転となり分離水の性状が安定すれば、余剰汚泥の混入が少ないために分離水を分配槽２２又は最初沈殿池１（生物処理槽２の上流側）へと返送しても、放流水のリン濃度は上昇しない。   By measuring the SS concentration of the separated water flowing through the path 11 and the path 17, it can be confirmed whether or not the properties of the separated water are stable. Immediately after the centrifugal concentrator 7 or the centrifugal dehydrator 8 is activated and the properties of the separated water are not stable, excess sludge is mixed and separated water having a high phosphorus concentration is sent to the excess sludge tank 10 or the mixed sludge tank 16. Will return the phosphorus concentration of the discharged water. If the centrifugal concentrator 7 and the centrifugal dehydrator 8 are in steady operation and the properties of the separated water are stabilized, the mixed water is distributed into the distribution tank 22 or the first sedimentation tank 1 (upstream of the biological treatment tank 2) because the excess sludge is not mixed. Even if returned to, the phosphorus concentration of the discharged water does not increase.

本発明の有機性廃水処理施設及びその運転方法は、下水処理分野等において有用である。   The organic wastewater treatment facility and the operation method thereof of the present invention are useful in the sewage treatment field and the like.

１：最初沈殿池
２：生物処理槽
３：最終沈殿池
４：汚泥処理施設
５：塩素混和池
６：重力濃縮槽
７：遠心濃縮機
８：遠心脱水機
１０：余剰汚泥槽
１１，１１ａ，１１ｂ：経路
１２：経路（第二返送経路）
１３：経路（第一返送経路）
１４：第一供給経路
１５：第二供給経路
１６：混合汚泥槽
１７：経路
１８：経路（第三返送経路）
１９：経路（第四返送経路）
２１：沈砂池
２２：分配槽（分水槽）
２３，２４；経路（第三供給経路）
２５：経路
２６：経路（第四供給経路） 1: First sedimentation tank 2: Biological treatment tank 3: Final sedimentation tank 4: Sludge treatment facility 5: Chlorine mixing tank 6: Gravity concentration tank 7: Centrifugal concentrator 8: Centrifugal dehydrator 10: Surplus sludge tank 11, 11a, 11b : Route 12: Route (second return route)
13: Route (first return route)
14: First supply route 15: Second supply route 16: Mixed sludge tank 17: Route 18: Route (third return route)
19: Route (fourth return route)
21: Sedimentation basin 22: Distribution tank (Diversion tank)
23, 24; route (third supply route)
25: Route 26: Route (fourth supply route)

Claims (4)

生物処理槽と、
生物処理槽で発生する余剰汚泥を貯留する余剰汚泥槽と、
余剰汚泥槽に貯留された余剰汚泥を濃縮するための遠心濃縮機と、
を備える有機性廃水処理施設の運転方法であって、
（ａ）遠心濃縮機の起動時には、遠心濃縮機の起動時排水を余剰汚泥槽へと返送し、
（ｂ）遠心濃縮機の定常運転時には、遠心濃縮機の分離水を生物処理槽の上流側へと返送する、
ことを特徴とする運転方法。 A biological treatment tank;
An excess sludge tank for storing excess sludge generated in the biological treatment tank;
A centrifugal concentrator for concentrating the excess sludge stored in the excess sludge tank;
A method for operating an organic wastewater treatment facility comprising:
(A) At the start of the centrifugal concentrator, the waste water at the start of the centrifugal concentrator is returned to the excess sludge tank,
(B) During the steady operation of the centrifugal concentrator, the separated water of the centrifugal concentrator is returned to the upstream side of the biological treatment tank.
A driving method characterized by that. 前記有機性廃水処理施設が
最初沈殿池と、
最初沈殿池で発生する初沈汚泥と前記遠心濃縮機から取り出される濃縮汚泥とを貯留する混合汚泥槽と、
混合汚泥槽に貯留された初沈汚泥及び濃縮汚泥の混合汚泥を脱水する遠心脱水機と、
をさらに備え、
（ｃ）遠心脱水機の起動時には、遠心脱水機の分離水を混合汚泥槽へと返送し、
（ｄ）遠心脱水機の定常運転時には、遠心脱水機の分離水を生物処理槽の上流側へと返送する、
請求項１に記載の運転方法。 The organic wastewater treatment facility is the first settling basin,
A mixed sludge tank for storing the first settling sludge generated in the first settling basin and the concentrated sludge taken out from the centrifugal concentrator;
A centrifugal dehydrator for dewatering the mixed sludge of the first settling sludge and concentrated sludge stored in the mixed sludge tank;
Further comprising
(C) At the start of the centrifugal dehydrator, the separated water of the centrifugal dehydrator is returned to the mixed sludge tank,
(D) During the steady operation of the centrifugal dehydrator, the separated water of the centrifugal dehydrator is returned to the upstream side of the biological treatment tank.
The operation method according to claim 1. 生物処理槽と、
生物処理槽で発生する余剰汚泥を貯留する余剰汚泥槽と、
余剰汚泥槽に貯留された余剰汚泥を濃縮するための遠心濃縮機と、
生物処理槽で発生した余剰汚泥を余剰汚泥槽へと供給する第一供給経路と、
余剰汚泥槽内の余剰汚泥を遠心濃縮機へと供給する第二供給経路と、
遠心濃縮機の分離水を生物処理槽の上流側へと返送する第一返送経路と、
遠心濃縮機の分離水を余剰汚泥槽へと返送する第二返送経路と、
を備え、
（ａ）遠心濃縮機の起動時には、遠心濃縮機の起動時排水を第二返送経路から余剰汚泥槽へと返送し、
（ｂ）遠心濃縮機の定常運転時には、遠心濃縮機の分離水を第一返送経路から生物処理槽の上流側へと返送する、
ことを特徴とする有機性廃水処理施設。 A biological treatment tank;
An excess sludge tank for storing excess sludge generated in the biological treatment tank;
A centrifugal concentrator for concentrating the excess sludge stored in the excess sludge tank;
A first supply path for supplying surplus sludge generated in the biological treatment tank to the surplus sludge tank;
A second supply path for supplying excess sludge in the excess sludge tank to the centrifugal concentrator;
A first return path for returning the separated water of the centrifugal concentrator to the upstream side of the biological treatment tank;
A second return path for returning the separated water of the centrifugal concentrator to the excess sludge tank;
With
(A) At the start of the centrifugal concentrator, the waste water at the start of the centrifugal concentrator is returned from the second return path to the excess sludge tank,
(B) During steady operation of the centrifugal concentrator, the separated water of the centrifugal concentrator is returned from the first return path to the upstream side of the biological treatment tank.
Organic wastewater treatment facility characterized by that. 前記有機性廃水処理施設が
最初沈殿池と、
最初沈殿池で発生する初沈汚泥と前記遠心濃縮機から取り出される濃縮汚泥とを貯留する混合汚泥槽と、
混合汚泥槽に貯留された初沈汚泥及び濃縮汚泥の混合汚泥を脱水する遠心脱水機と、
最初沈殿池で発生する初沈汚泥を混合汚泥槽へと供給する第三供給経路と、
混合汚泥槽に貯留された混合汚泥を遠心脱水機へと供給する第四供給経路と、
遠心脱水機の分離水を生物処理槽の上流側へと返送する第三返送経路と、
遠心脱水機の分離水を混合汚泥槽へと返送する第四返送経路と、
をさらに備え、
（ｃ）遠心脱水機の起動時には、遠心脱水機の分離水を第四返送経路から混合汚泥槽へと返送し、
（ｄ）遠心脱水機の定常運転時には、遠心脱水機の分離水を第三返送経路から生物処理槽の上流側へと返送する、
請求項３に記載の有機性廃水処理施設。 The organic wastewater treatment facility is the first settling basin,
A mixed sludge tank for storing the first settling sludge generated in the first settling basin and the concentrated sludge taken out from the centrifugal concentrator;
A centrifugal dehydrator for dewatering the mixed sludge of the first settling sludge and concentrated sludge stored in the mixed sludge tank;
A third supply path for supplying the first settling sludge generated in the first settling basin to the mixed sludge tank;
A fourth supply path for supplying the mixed sludge stored in the mixed sludge tank to the centrifugal dehydrator;
A third return path for returning the separated water of the centrifugal dehydrator to the upstream side of the biological treatment tank;
A fourth return path for returning the separated water of the centrifugal dehydrator to the mixed sludge tank;
Further comprising
(C) At the start of the centrifugal dehydrator, the separated water of the centrifugal dehydrator is returned from the fourth return path to the mixed sludge tank,
(D) During steady operation of the centrifugal dehydrator, the separated water of the centrifugal dehydrator is returned from the third return path to the upstream side of the biological treatment tank.
The organic wastewater treatment facility according to claim 3.
JP2013212088A 2013-10-09 2013-10-09 Organic waste water treatment plant, and method for operating the same Pending JP2015073950A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106430902A (en) * 2016-11-25 2017-02-22 东南大学 Method for treating excess sludge of sewage plant
CN111875213A (en) * 2020-07-24 2020-11-03 新疆泰沅水务技术有限公司 Centrifugal type precipitation concentration tank and use method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001070999A (en) * 1999-07-05 2001-03-21 Nkk Corp Method and apparatus for treating wastewater
JP2004041953A (en) * 2002-07-12 2004-02-12 Mitsubishi Kakoki Kaisha Ltd Method and equipment for treating organic waste water
JP2007196141A (en) * 2006-01-26 2007-08-09 Kurita Water Ind Ltd Sludge treatment method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001070999A (en) * 1999-07-05 2001-03-21 Nkk Corp Method and apparatus for treating wastewater
JP2004041953A (en) * 2002-07-12 2004-02-12 Mitsubishi Kakoki Kaisha Ltd Method and equipment for treating organic waste water
JP2007196141A (en) * 2006-01-26 2007-08-09 Kurita Water Ind Ltd Sludge treatment method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106430902A (en) * 2016-11-25 2017-02-22 东南大学 Method for treating excess sludge of sewage plant
CN111875213A (en) * 2020-07-24 2020-11-03 新疆泰沅水务技术有限公司 Centrifugal type precipitation concentration tank and use method

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