JP2001300580A - Air diffuser for high-concentration sewage - Google Patents
Air diffuser for high-concentration sewageInfo
- Publication number
- JP2001300580A JP2001300580A JP2000128664A JP2000128664A JP2001300580A JP 2001300580 A JP2001300580 A JP 2001300580A JP 2000128664 A JP2000128664 A JP 2000128664A JP 2000128664 A JP2000128664 A JP 2000128664A JP 2001300580 A JP2001300580 A JP 2001300580A
- Authority
- JP
- Japan
- Prior art keywords
- air
- diffuser
- sewage
- tank
- supply system
- 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
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高濃度汚水の散気
装置に関し、有機物、窒素濃度の高い有機性汚水を膜分
離装置を使用して活性汚泥処理する浸漬型活性汚泥処理
技術に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffuser for high-concentration sewage, and to a immersion-type activated sludge treatment technique for treating organic sewage having a high concentration of organic substances and nitrogen using a membrane separator. It is.
【０００２】[0002]
【従来の技術】従来、有機物、窒素濃度の高い有機性汚
水を処理する方法として活性汚泥処理があり、膜分離装
置を併用して槽内の活性汚泥濃度を高く維持する膜分離
活性汚泥処理がある。2. Description of the Related Art Conventionally, there is an activated sludge treatment as a method for treating organic matter and organic wastewater having a high nitrogen concentration. A membrane separation activated sludge treatment for maintaining a high concentration of activated sludge in a tank by using a membrane separation device together is known. is there.
【０００３】図３に示すような、一般的な膜分離活性汚
泥処理を行なう水処理システムでは、流入汚水２１を前
処理設備２２にて夾雑物を除去した後に流量調整槽２３
に貯留し、一定の流量で生物処理槽（曝気槽）２４に供
給しており、生物処理槽２４にて活性汚泥により汚水中
の有機物質を分解除去し、生物処理槽２４に浸漬設置し
た膜分離装置２５で固液分離し、濾液を放流している。[0003] In a water treatment system for performing a general membrane separation activated sludge treatment as shown in FIG. 3, an inflow sewage 21 is subjected to a pretreatment facility 22 to remove contaminants and then a flow control tank 23.
Stored in the biological treatment tank (aeration tank) 24 at a constant flow rate, the organic substance in the sewage is decomposed and removed by activated sludge in the biological treatment tank 24, and the membrane is immersed and installed in the biological treatment tank 24. Solid-liquid separation is performed by the separation device 25, and the filtrate is discharged.
【０００４】膜分離装置２５は、複数枚の平板状膜カー
トリッジ２６と、その下方より膜面洗浄気体を噴出する
散気装置２７とをケース２８の内部に配置したものであ
る。この膜分離装置２５を活性汚泥処理施設において使
用する場合には、曝気槽内部の活性汚泥混合液中に膜分
離装置２５を浸漬し、散気装置２７より曝気空気を噴出
させる状態において、原水中の有機物や窒素を活性汚泥
により処理しており、活性汚泥混合液は、槽内での水頭
を駆動圧として膜カートリッジ２６により重力濾過し
（吸引ポンプでの吸引濾過も可能である）、膜カートリ
ッジ２６の膜面を透過した透過液を処理水として槽外へ
導出する。このとき、散気装置２７より噴出する曝気空
気の気泡およびそれにより生起される上昇流が掃流とな
って膜カートリッジの膜面を洗浄している。[0004] The membrane separation device 25 has a plurality of flat membrane cartridges 26 and an air diffuser 27 for ejecting a membrane cleaning gas from below the cartridges 26 disposed inside a case 28. When this membrane separation device 25 is used in the activated sludge treatment facility, the raw water is immersed in the activated sludge mixed liquid inside the aeration tank and the aeration air is ejected from the diffuser 27. The activated sludge mixture is gravity-filtered by the membrane cartridge 26 using the water head in the tank as the driving pressure (suction filtration with a suction pump is also possible). The permeated liquid that has passed through the membrane surface of 26 is led out of the tank as treated water. At this time, the bubbles of the aerated air ejected from the air diffuser 27 and the upward flow generated by the bubbles serve as a scavenging flow to wash the membrane surface of the membrane cartridge.
【０００５】[0005]
【発明が解決しようとする課題】上記したような浸漬型
膜分離装置を使用する浸漬型膜分離活性汚泥法では、活
性汚泥の固液分離を完全に行なえるので、活性汚泥濃度
を高く維持する運転が可能であり、大きな特徴となって
いる。しかし、汚泥濃度を高くすると微生物の要求する
酸素量が増大する。その結果、曝気槽混合液中の溶存酸
素量（以下ＤＯと呼称する）が低下し、処理水質の悪化
や汚泥の濾過性の低下を招く。In the immersion type membrane separation activated sludge method using the immersion type membrane separation apparatus as described above, the solid-liquid separation of the activated sludge can be performed completely, so that the activated sludge concentration is maintained at a high level. Driving is possible, a major feature. However, increasing the sludge concentration increases the amount of oxygen required by microorganisms. As a result, the amount of dissolved oxygen (hereinafter referred to as DO) in the mixed solution in the aeration tank decreases, resulting in deterioration of the quality of the treated water and deterioration of the filtration property of the sludge.
【０００６】有機物、窒素濃度の高い有機性汚水を処理
する場合には、汚濁物質を除去するに必要な酸素量が多
く、曝気槽を二段階にして反応時間を長くすることが多
い。しかしながら、既設の処理施設でＤＯが不足した場
合には曝気槽の増設は困難であり、その対策が取り難
い。When treating organic wastewater having a high concentration of organic substances and nitrogen, the amount of oxygen necessary for removing pollutants is large, and the reaction time is often lengthened by using two stages of aeration tanks. However, if DO is insufficient at the existing treatment facility, it is difficult to add an aeration tank, and it is difficult to take countermeasures.
【０００７】一方、槽容量はそのままで酸素溶解効率の
高い散気管を用いることや、供給空気量を大きくするな
どの対策が取られることもある。しかし、膜分離装置に
使用する散気管は膜分離装置と一体に設置したり、膜面
洗浄効果の高い散気管を設置しているので、散気管を交
換することは困難である。On the other hand, measures such as using an air diffuser with high oxygen dissolving efficiency while keeping the tank capacity or increasing the amount of supplied air are sometimes taken. However, since the air diffuser used in the membrane separator is installed integrally with the membrane separator or an air diffuser having a high membrane surface cleaning effect, it is difficult to replace the air diffuser.
【０００８】さらに、曝気する空気量を増やすと膜分離
装置の膜の寿命を縮めることにつながるので、一定限度
以上に空気量を増やすことはできない。本発明は上記し
た課題を解決するものであり、曝気槽容量を増大させる
ことなく、曝気槽混合液への酸素供給効率を向上させる
ことができる高濃度汚水の散気装置を提供することを目
的とする。Further, since increasing the amount of air to be aerated leads to shortening the life of the membrane of the membrane separation device, the amount of air cannot be increased beyond a certain limit. The present invention solves the above-described problems, and an object of the present invention is to provide a diffuser for high-concentration sewage, which can improve the efficiency of supplying oxygen to an aeration tank mixture without increasing the capacity of the aeration tank. And
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に、請求項１に係る本発明の高濃度汚水の散気装置は、
有機性汚水を生物処理する反応槽と、反応槽内に浸漬し
た浸漬型膜分離装置と、浸漬型膜分離装置の下方に配置
した散気管と、散気管に空気を供給する空気供給系と、
反応槽へ有機性汚水を供給する汚水供給系とを有する汚
水処理装置において、汚水供給系に外部散気部を設け、
外部散気部の上流側に空気供給系を接続し、外部散気部
に上流側管路に比べて流路断面が急激に拡大する急拡大
流路部を設けた構成としたものである。In order to solve the above-mentioned problems, a high-concentration sewage diffusing apparatus according to the present invention according to claim 1 is provided.
A reaction tank for biologically treating organic wastewater, an immersion type membrane separation device immersed in the reaction tank, an air diffuser arranged below the immersion type membrane separation device, and an air supply system for supplying air to the air diffusion tube,
In a sewage treatment apparatus having a sewage supply system that supplies organic sewage to a reaction tank, an external air diffuser is provided in the sewage supply system,
An air supply system is connected to the upstream side of the external diffuser, and the external diffuser is provided with a rapidly expanding flow path section whose flow path cross section is sharply expanded as compared with the upstream pipe.
【００１０】上記した構成により、反応槽においては、
空気供給系から供給する空気を散気管から噴出させる状
態において、有機性汚水中の有機物や窒素を活性汚泥に
より処理する。活性汚泥混合液は、槽内での水頭を駆動
圧として膜分離装置により重力濾過し、あるいは吸引ポ
ンプで吸引濾過し、膜分離装置を透過した透過液を処理
水として槽外へ導出する。With the above configuration, in the reaction tank,
In a state where the air supplied from the air supply system is blown out from the air diffuser, organic matter and nitrogen in the organic wastewater are treated with activated sludge. The activated sludge mixture is subjected to gravity filtration by a membrane separation device or suction filtration by a suction pump using the head in the tank as a driving pressure, and the permeate passed through the membrane separation device is led out of the tank as treated water.
【００１１】このとき、散気管より噴出する曝気空気の
気泡およびそれにより生起される上昇流が掃流となって
膜分離装置の膜面を洗浄し、分離機能の低下を抑制して
膜分離装置が機能不全に至ることを防止する。At this time, the bubbles of the aerated air ejected from the air diffuser and the upward flow generated by the bubbles serve as a scavenging stream to clean the membrane surface of the membrane separation device, and to suppress a decrease in the separation function to suppress the separation function. Prevent dysfunction.
【００１２】ところで、流路断面が急激に拡大する流路
に噴流を噴出させると流体の発振現象が生起することが
知られている。[可視化情報学会三重講演会講演論文
集、Ｖｏｌ．１８ Ｓｕｐｐｌ．Ｎｏ．２（１９９８−
９）、ｐｐ．３５−３８．]このために、急拡大流路部
に有機性汚水が空気供給系から供給する空気を伴って気
液二相流となって流入すると、流体の発振現象による激
烈な混合攪拌作用によって空気の気泡が微細化されて気
液の接触が促進されるので、物質伝達の促進によって酸
素溶解効率が高まる。したがって、反応槽における曝気
空気量を増加させることなく、有機物、窒素濃度の高い
有機性汚水を処理するに必要な酸素量（溶存酸素濃度）
を確保することができる。By the way, it is known that when a jet is jetted into a flow channel whose flow channel cross section is rapidly expanded, a fluid oscillation phenomenon occurs. [Proceedings of Mie Seminar, Vol. 18 Suppl. No. 2 (1998-
9), pp. 35-38. For this reason, when organic wastewater flows into the rapidly expanding flow path as a gas-liquid two-phase flow with air supplied from the air supply system, air bubbles are generated by vigorous mixing and stirring action due to the oscillation phenomenon of the fluid. Are miniaturized and gas-liquid contact is promoted, so that the oxygen dissolving efficiency is enhanced by promoting the mass transfer. Therefore, the amount of oxygen (dissolved oxygen concentration) required to treat organic matter and organic sewage with a high nitrogen concentration without increasing the amount of aerated air in the reaction tank
Can be secured.
【００１３】また、外部散気部は急拡大流路部において
流路断面が拡大するだけの構造であり、内部に攪拌用の
機械部材等の障害物が存在しないので、夾雑物の絡み付
きや汚泥による閉塞が起こらない。Further, the external air diffuser has a structure in which the cross section of the flow channel is only enlarged in the rapidly expanding flow channel portion, and there is no obstacle such as a mechanical member for agitation inside. No blockage occurs.
【００１４】請求項２に係る本発明の高濃度汚水の散気
装置は、有機性汚水が流入する嫌気槽と、嫌気槽の下流
側に配置する好気槽と、好気槽内に配置する散気管と、
散気管に空気を供給する空気供給系と、嫌気槽の嫌気槽
混合液を好気槽へ供給する汚水供給系と、好気槽の好気
槽混合液を嫌気槽へ返送する循環液系とを有する汚水処
理装置において、汚水供給系に外部散気部を設け、外部
散気部の上流側に空気供給系を接続し、外部散気部に上
流側管路に比べて流路断面が急激に拡大する急拡大流路
部を設け、循環液系を外部散気部の上流側に接続した構
成としたものである。According to a second aspect of the present invention, the high-concentration sewage diffuser according to the present invention is disposed in an anaerobic tank into which organic sewage flows, an aerobic tank disposed downstream of the anaerobic tank, and an aerobic tank. A diffuser,
An air supply system that supplies air to the air diffuser, a sewage supply system that supplies the anaerobic tank mixture in the anaerobic tank to the aerobic tank, and a circulating liquid system that returns the aerobic tank mixture in the aerobic tank to the anaerobic tank. In the sewage treatment apparatus having a sewage treatment system, an external diffuser is provided in the sewage supply system, an air supply system is connected to the upstream side of the external diffuser, and the external diffuser has a sharper cross section than the upstream pipe. The circulating liquid system is connected to the upstream side of the external air diffuser.
【００１５】上記した構成により、嫌気槽に流入する有
機性汚水は嫌気槽から嫌気槽混合液として汚水供給系お
よび外部散気部を通って好気槽へ送り、好気槽混合液を
循環液系を通して嫌気槽に返送することで硝化・脱窒処
理される。このとき、好気槽混合液の一部を循環液系を
通して外部散気部の上流側へ返送することにより、反応
槽における曝気空気量および外部散気部へ供給する空気
量を増加させることなく、有機物、窒素濃度の高い有機
性汚水を処理するに必要な酸素量（溶存酸素濃度）を任
意に調整することができる。With the above construction, the organic sewage flowing into the anaerobic tank is sent from the anaerobic tank to the aerobic tank through the sewage supply system and the external diffuser as an anaerobic tank mixed liquid, and the aerobic tank mixed liquid is circulated into the circulating liquid. It is nitrified and denitrified by returning it to the anaerobic tank through the system. At this time, by returning a part of the aerobic tank mixed solution to the upstream side of the external diffuser through the circulating liquid system, it is possible to increase the amount of aerated air in the reaction tank and the amount of air supplied to the external diffuser. The amount of oxygen (dissolved oxygen concentration) required for treating organic wastewater having a high concentration of organic matter and nitrogen can be arbitrarily adjusted.
【００１６】請求項３に係る本発明の高濃度汚水の散気
装置は、好気槽内に浸漬型膜分離装置を浸漬し、散気管
を浸漬型膜分離装置の下方に配置した構成としたもので
ある。The diffuser for high-concentration sewage of the present invention according to claim 3 has a configuration in which an immersion type membrane separator is immersed in an aerobic tank and an air diffuser is disposed below the immersion type membrane separator. Things.
【００１７】請求項４に係る本発明の高濃度汚水の散気
装置は、嫌気槽が流量調整槽を兼ねる構成としたもので
ある。請求項５に係る本発明の高濃度汚水の散気装置
は、外部散気部が上流側管路に接続する円形断面の円形
流路部と多角形断面の急拡大流路部とを有する構成とし
たものである。According to a fourth aspect of the present invention, there is provided the apparatus for diffusing high-concentration sewage according to the present invention, wherein the anaerobic tank also functions as a flow control tank. The high-concentration sewage diffuser of the present invention according to claim 5 has a configuration in which the external diffuser has a circular cross-section having a circular cross-section connected to the upstream pipeline and a rapidly expanding channel having a polygonal cross-section. It is what it was.
【００１８】特に多角形断面は矩形流路が好ましく、流
路断面における幅／高さの比率は１．２〜５で望ましく
は１．５〜３である。Particularly, the polygonal cross section is preferably a rectangular flow path, and the width / height ratio in the flow path cross section is 1.2 to 5, preferably 1.5 to 3.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１において、有機物、窒素濃度
の高い有機性汚水である流入汚水１を好気槽（反応槽）
２へ導く汚水供給系３には、前処理設備４、流量調整槽
を兼ねる嫌気槽５を上流側から順次に設けており、嫌気
槽５の嫌気槽混合液を好気槽２へ供給する汚水供給系３
には送液ポンプ３ａおよび外部散気部６を設けている。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, inflow sewage 1, which is an organic sewage having a high concentration of organic matter and nitrogen, is subjected to an aerobic tank (reaction tank).
In the sewage supply system 3 leading to the anaerobic tank 2, a pretreatment facility 4, and an anaerobic tank 5 also serving as a flow rate adjusting tank are provided sequentially from the upstream side. Supply system 3
Is provided with a liquid feed pump 3a and an external air diffuser 6.
【００２０】外部散気部６は、図２に示すように、汚水
供給系３の上流側管路に接続する円形断面の円形流路部
６ａと多角形断面の急拡大流路部６ｂとを有し、急拡大
流路部６ｂは円形流路部６ａに比べて流路断面が急激に
拡大する形状をなしており、その多角形断面としては矩
形断面が好ましく、矩形断面における幅／高さの比率は
１．２〜５であり、望ましくは１．５〜３であり、後述
する流体振動が最も良く発生する。図２において、急拡
大流路部６ｂの下流側は漸次に流路断面が小さくなる形
状を有しているが、上流側と同様に急激に変化（縮小）
する形状とすることも可能である。また、外部散気部６
は鉛直方向に配置しているが水平方向に配置することも
可能である。As shown in FIG. 2, the external air diffuser 6 includes a circular flow path 6a having a circular cross section connected to the upstream pipeline of the sewage supply system 3 and a rapidly expanding flow path 6b having a polygonal cross section. The rapidly expanding flow path portion 6b has a shape in which the flow path cross section is rapidly expanded as compared with the circular flow path portion 6a, and the polygonal cross section is preferably a rectangular cross section, and the width / height in the rectangular cross section is provided. Is from 1.2 to 5, preferably from 1.5 to 3, and the fluid vibration described below occurs most frequently. In FIG. 2, the downstream side of the rapidly expanding flow path portion 6 b has a shape in which the flow path cross section gradually becomes smaller, but rapidly changes (reduces) like the upstream side.
It is also possible to adopt a shape that does. In addition, external air diffuser 6
Although they are arranged vertically, they can be arranged horizontally.
【００２１】好気槽２は槽内に浸漬型膜分離装置７を浸
漬しており、散気管８を浸漬型膜分離装置７の下方位置
に配置している。散気管８にはブロア９を空気供給源と
する空気供給系１０を接続している。空気供給系１０は
途中で分岐して外部散気部６の上流側に接続している。In the aerobic tank 2, the immersion type membrane separation device 7 is immersed in the tank, and the diffuser tube 8 is disposed below the immersion type membrane separation device 7. An air supply system 10 using a blower 9 as an air supply source is connected to the air diffuser 8. The air supply system 10 branches on the way and is connected to the upstream side of the external diffuser 6.
【００２２】好気槽２と嫌気槽５の間には好気槽２の好
気槽混合液を嫌気槽５へ返送するために、循環ポンプ１
１を有する循環液系１２を設けている。循環液系１２は
途中で分岐し、流量調整バルブ１３を介して外部散気部
６の上流側に接続している。好気槽２の下流側には滅菌
槽１４を設けている。A circulation pump 1 is provided between the aerobic tank 2 and the anaerobic tank 5 in order to return the aerobic tank mixture of the aerobic tank 2 to the anaerobic tank 5.
1 is provided. The circulating liquid system 12 branches on the way and is connected to the upstream side of the external air diffuser 6 via the flow control valve 13. A sterilization tank 14 is provided downstream of the aerobic tank 2.
【００２３】以下、上記した構成における作用を説明す
る。流入汚水１は汚水供給系３を通して前処理設備４に
流入し、前処理設備４で夾雑物を除去した後に嫌気槽５
に流入する。その後に流量調整槽を兼ねる嫌気槽５の嫌
気槽混合液は汚水供給系３を通して一定の流量で外部散
気部６を通して好気槽２に供給し、好気槽２の好気槽混
合液は循環液系１２を通して嫌気槽５へ返送し、流入汚
水を好気槽２および嫌気槽５において硝化・脱窒処理す
る。この返送量は流入汚水１の系内への流入量１Ｑに対
して２Ｑ〜５Ｑである。The operation of the above configuration will be described below. The inflowed sewage 1 flows into the pretreatment facility 4 through the sewage supply system 3, and after removing impurities in the pretreatment facility 4, the anaerobic tank 5
Flows into. Thereafter, the anaerobic tank mixed solution of the anaerobic tank 5 also serving as a flow rate adjusting tank is supplied to the aerobic tank 2 at a constant flow rate through the sewage supply system 3 to the aerobic tank 2. The wastewater is returned to the anaerobic tank 5 through the circulating liquid system 12, and the inflow sewage is subjected to nitrification and denitrification in the aerobic tank 2 and the anaerobic tank 5. This return amount is 2Q to 5Q with respect to the inflow amount 1Q of the inflow sewage 1 into the system.
【００２４】好気槽２では、空気供給系１０から供給す
る空気を散気管８から噴出させる状態において、流入汚
水１の有機性汚水中の有機物や窒素を活性汚泥により処
理するとともに、活性汚泥混合液を槽内での水頭を駆動
圧として浸漬型膜分離装置７により重力濾過し、あるい
は吸引ポンプで吸引濾過し、浸漬型膜分離装置７を透過
した透過液を処理水として槽外へ導出する。この処理水
は滅菌槽１４を経て放流する。In the aerobic tank 2, while air supplied from the air supply system 10 is blown out from the air diffuser 8, the organic matter and nitrogen in the organic sewage of the inflow sewage 1 are treated with activated sludge and the activated sludge is mixed. The liquid is gravity-filtered by the immersion type membrane separation device 7 or the suction filtration is performed by the suction pump using the head in the tank as the driving pressure, and the permeate that has passed through the immersion type membrane separation device 7 is led out of the tank as treated water. . This treated water is discharged through the sterilization tank 14.
【００２５】好気槽２において、散気管８より噴出する
曝気空気の気泡およびそれにより生起される上昇流は掃
流となって浸漬型膜分離装置７の膜面を洗浄し、分離機
能の低下を抑制して浸漬型膜分離装置７が機能不全に至
ることを防止する。In the aerobic tank 2, the bubbles of the aerated air ejected from the air diffuser 8 and the upward flow generated by the aerated air serve as a scavenging stream to clean the membrane surface of the immersion type membrane separation device 7, thereby deteriorating the separation function. To prevent the immersion type membrane separation device 7 from malfunctioning.
【００２６】一方、送液ポンプ３ａによって外部散気部
６に供給する流入汚水は、空気供給系１０から外部散気
部６の上流側に供給する空気を伴って気液二相流となっ
て急拡大流路部６ｂに所定圧力で噴出し、流体の発振現
象による激烈な混合攪拌作用によって空気の気泡が微細
化されて気液の接触が促進される。このため、気相と液
相との間における物質伝達の促進によって酸素溶解効率
が高まり、好気槽２における曝気空気量を増加させるこ
となく、有機物、窒素濃度の高い有機性汚水を処理する
に必要な酸素量（溶存酸素濃度）を確保することができ
る。On the other hand, the inflowing sewage supplied to the external diffuser 6 by the liquid feed pump 3a becomes a gas-liquid two-phase flow with air supplied from the air supply system 10 to the upstream side of the external diffuser 6. Air is jetted into the suddenly expanding flow path 6b at a predetermined pressure, and the air bubbles are fined by vigorous mixing and stirring action due to the oscillation phenomenon of the fluid, so that gas-liquid contact is promoted. For this reason, the oxygen dissolution efficiency is enhanced by promoting the mass transfer between the gas phase and the liquid phase, and the organic wastewater having a high concentration of organic substances and nitrogen is treated without increasing the amount of aerated air in the aerobic tank 2. The required oxygen amount (dissolved oxygen concentration) can be secured.
【００２７】また、外部散気部６は急拡大流路部６ｂに
おいて流路断面が拡大するだけの単純な構造であり、内
部に攪拌用の機械部材等の障害物が存在しないので、夾
雑物の絡み付きや汚泥による閉塞が起こらない。Further, the external air diffuser 6 has a simple structure in which the cross section of the flow passage is enlarged in the rapidly expanding flow passage 6b, and there is no obstacle such as a mechanical member for stirring inside. No entanglement or blockage by sludge occurs.
【００２８】さらに、上述の操作によって所定の溶存酸
素濃度を有する好気槽２の好気槽混合液の一部を循環液
系１２を通して外部散気部６の上流側へ返送することに
より、好気槽２における曝気空気量および外部散気部６
へ供給する空気量を増加させることなく、有機物、窒素
濃度の高い有機性汚水を処理するに必要な酸素量（溶存
酸素濃度）を任意に調整することができる。外部散気部
６へ返送する好気槽混合液量は流量調整バルブ１３の操
作で行う。Further, a part of the aerobic tank mixed solution of the aerobic tank 2 having a predetermined dissolved oxygen concentration is returned to the upstream side of the external aeration unit 6 through the circulating liquid system 12 by the above-described operation. Aeration air volume in air tank 2 and external air diffuser 6
It is possible to arbitrarily adjust the amount of oxygen (dissolved oxygen concentration) required for treating organic matter and organic sewage having a high nitrogen concentration without increasing the amount of air supplied to the system. The amount of the mixed liquid in the aerobic tank to be returned to the external air diffuser 6 is controlled by operating the flow control valve 13.
【００２９】また、本実施の形態ではブロア９によって
外部散気部６へ給気したが、送液ポンプ３ａの吐出圧を
エジェクターの駆動圧力としても利用して吸気すること
も可能であり、この場合には動力費が増加しない。In the present embodiment, the air is supplied to the external air diffuser 6 by the blower 9. However, it is also possible to use the discharge pressure of the liquid feed pump 3a as the drive pressure of the ejector to inhale air. In that case, the power cost does not increase.
【００３０】[0030]
【発明の効果】以上のように本発明によれば、急拡大流
路部に有機性汚水が空気供給系から供給する空気を伴っ
て気液二相流となって流入することにより、流体の発振
現象による激烈な混合攪拌作用によって空気の気泡を微
細化して気液の接触を促進して酸素溶解効率を高めるこ
とができ、反応槽における曝気空気量を増加させること
なく、有機物、窒素濃度の高い有機性汚水を処理するに
必要な酸素量（溶存酸素濃度）を確保することができ
る。外部散気部は急拡大流路部において流路断面が拡大
するだけの構造であり、内部に攪拌用の機械部材等の障
害物が存在しないので、夾雑物の絡み付きや汚泥による
閉塞が起こらない。また、好気槽混合液の一部を循環液
系を通して外部散気部の上流側へ返送することにより、
反応槽における曝気空気量および外部散気部へ供給する
空気量を増加させることなく、有機物、窒素濃度の高い
有機性汚水を処理するに必要な酸素量（溶存酸素濃度）
を任意に調整することができる。As described above, according to the present invention, the organic sewage flows into the rapidly expanding flow path as a gas-liquid two-phase flow with the air supplied from the air supply system, whereby the fluid is discharged. The vigorous mixing and stirring action by the oscillation phenomenon makes air bubbles finer and promotes gas-liquid contact to enhance oxygen dissolving efficiency.Without increasing the amount of aerated air in the reaction tank, the concentration of organic matter and nitrogen The amount of oxygen (dissolved oxygen concentration) necessary for treating high organic wastewater can be secured. The external air diffuser has a structure in which the cross section of the flow channel only expands in the rapidly expanding flow channel portion, and there is no obstacle such as a mechanical member for stirring inside, so that no entanglement of foreign substances or blockage due to sludge does not occur. . Also, by returning a part of the aerobic tank mixture to the upstream side of the external diffuser through the circulating liquid system,
The amount of oxygen (dissolved oxygen concentration) required to treat organic matter and organic sewage with a high nitrogen concentration without increasing the amount of aerated air in the reactor and the amount of air supplied to the external diffuser
Can be adjusted arbitrarily.
【図１】本発明の実施の形態における汚水の処理方法を
示すフローシート図である。FIG. 1 is a flowchart illustrating a method for treating wastewater according to an embodiment of the present invention.
【図２】同実施の形態における外部散気部の構成を示す
模式図である。FIG. 2 is a schematic diagram showing a configuration of an external air diffuser in the embodiment.
【図３】従来の汚水の処理方法を示すフローシート図で
ある。FIG. 3 is a flow sheet diagram showing a conventional wastewater treatment method.
１ 流入汚水 ２ 好気槽（反応槽） ３ 汚水供給系 ４ 前処理設備 ５ 嫌気槽 ６ 外部散気部 ６ａ 円形流路部 ６ｂ 急拡大流路部 ７ 浸漬型膜分離装置 ８ 散気管 ９ ブロア １０ 空気供給系 １１ 循環ポンプ １２ 循環液系 １３ 流量調整バルブ １４ 滅菌槽 DESCRIPTION OF SYMBOLS 1 Inflow sewage 2 Aerobic tank (reaction tank) 3 Sewage supply system 4 Pretreatment equipment 5 Anaerobic tank 6 External diffuser 6a Circular channel 6b Rapid expansion channel 7 Immersion type membrane separation device 8 Air diffuser 9 Blower 10 Air supply system 11 Circulation pump 12 Circulating fluid system 13 Flow control valve 14 Sterilization tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上坂 太一 大阪府大阪市浪速区敷津東一丁目２番47号 株式会社クボタ内 Ｆターム(参考） 4D006 GA02 HA93 JA31A JA51A JA67A JA70A KA02 KA44 KB22 KB23 PB08 PC62 4D028 AA08 BB07 BC03 BC12 BC17 BC24 BC28 4D029 AA01 AA03 AB03 DD03 4D040 BB56 BB57 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Taichi Uesaka 2-47 Shishitsuhigashi, Namiwa-ku, Osaka-shi, Osaka F-term in Kubota Corporation (reference) 4D006 GA02 HA93 JA31A JA51A JA67A JA70A KA02 KA44 KB22 KB23 PB08 PC62 4D028 AA08 BB07 BC03 BC12 BC17 BC24 BC28 4D029 AA01 AA03 AB03 DD03 4D040 BB56 BB57
Claims (5)
応槽内に浸漬した浸漬型膜分離装置と、浸漬型膜分離装
置の下方に配置した散気管と、散気管に空気を供給する
空気供給系と、反応槽へ有機性汚水を供給する汚水供給
系とを有する汚水処理装置において、汚水供給系に外部
散気部を設け、外部散気部の上流側に空気供給系を接続
し、外部散気部に上流側管路に比べて流路断面が急激に
拡大する急拡大流路部を設けたことを特徴とする高濃度
汚水の散気装置。1. A reactor for biologically treating organic wastewater, a submerged membrane separator immersed in the reactor, an air diffuser disposed below the submerged membrane separator, and air supplied to the air diffuser. In a sewage treatment apparatus having an air supply system and a sewage supply system for supplying organic sewage to a reaction tank, an external diffuser is provided in the sewage supply system, and an air supply system is connected to an upstream side of the external diffuser. A high-concentration sewage diffuser, characterized in that the external diffuser is provided with a rapidly expanding flow path part whose flow path cross section is rapidly expanded as compared with the upstream pipe.
の下流側に配置する好気槽と、好気槽内に配置する散気
管と、散気管に空気を供給する空気供給系と、嫌気槽の
嫌気槽混合液を好気槽へ供給する汚水供給系と、好気槽
の好気槽混合液を嫌気槽へ返送する循環液系とを有する
汚水処理装置において、汚水供給系に外部散気部を設
け、外部散気部の上流側に空気供給系を接続し、外部散
気部に上流側管路に比べて流路断面が急激に拡大する急
拡大流路部を設け、循環液系を外部散気部の上流側に接
続したことを特徴とする高濃度汚水の散気装置。2. An anaerobic tank into which organic sewage flows, an aerobic tank arranged downstream of the anaerobic tank, an air diffuser arranged in the aerobic tank, and an air supply system for supplying air to the air diffuser. A sewage supply system that supplies an anaerobic tank mixed solution of an anaerobic tank to the aerobic tank, and a circulating liquid system that returns the aerobic tank mixed solution of the aerobic tank to the anaerobic tank. An external air diffuser is provided, an air supply system is connected to the upstream side of the external air diffuser, and a suddenly enlarged flow path section is provided in the external air diffuser, in which a flow path cross section is sharply expanded as compared to the upstream pipe, A diffuser for high-concentration sewage, wherein a circulating liquid system is connected to an upstream side of an external diffuser.
散気管を浸漬型膜分離装置の下方に配置したことを特徴
とする請求項２に記載の高濃度汚水の散気装置。3. An immersion type membrane separation device is immersed in an aerobic tank,
The air diffuser according to claim 2, wherein the air diffuser is disposed below the immersion type membrane separation device.
とする請求項２又は３に記載の高濃度汚水の散気装置。4. The apparatus according to claim 2, wherein the anaerobic tank also functions as a flow rate adjusting tank.
断面の円形流路部と多角形断面の急拡大流路部とを有す
ることを特徴とする請求項１〜４の何れか１項に記載の
高濃度汚水の散気装置。5. The external air diffuser has a circular flow path having a circular cross section connected to the upstream conduit and a rapidly expanding flow path having a polygonal cross section. 2. The device for diffusing high-concentration sewage according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000128664A JP2001300580A (en) | 2000-04-28 | 2000-04-28 | Air diffuser for high-concentration sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000128664A JP2001300580A (en) | 2000-04-28 | 2000-04-28 | Air diffuser for high-concentration sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001300580A true JP2001300580A (en) | 2001-10-30 |
Family
ID=18638071
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000128664A Pending JP2001300580A (en) | 2000-04-28 | 2000-04-28 | Air diffuser for high-concentration sewage |
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| Country | Link |
|---|---|
| JP (1) | JP2001300580A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007190488A (en) * | 2006-01-19 | 2007-08-02 | Mitsubishi Rayon Eng Co Ltd | Membrane separation activated sludge treatment apparatus |
| JP6195000B1 (en) * | 2016-09-23 | 2017-09-13 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
-
2000
- 2000-04-28 JP JP2000128664A patent/JP2001300580A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007190488A (en) * | 2006-01-19 | 2007-08-02 | Mitsubishi Rayon Eng Co Ltd | Membrane separation activated sludge treatment apparatus |
| JP6195000B1 (en) * | 2016-09-23 | 2017-09-13 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
| JP2018047431A (en) * | 2016-09-23 | 2018-03-29 | 栗田工業株式会社 | Biotreatment method of organic waste water |
| WO2018055793A1 (en) * | 2016-09-23 | 2018-03-29 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
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