JP2008229436A - Wastewater treatment method and apparatus - Google Patents

Wastewater treatment method and apparatus Download PDF

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JP2008229436A
JP2008229436A JP2007070189A JP2007070189A JP2008229436A JP 2008229436 A JP2008229436 A JP 2008229436A JP 2007070189 A JP2007070189 A JP 2007070189A JP 2007070189 A JP2007070189 A JP 2007070189A JP 2008229436 A JP2008229436 A JP 2008229436A
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enriched air
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JP4985002B2 (en
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Norio Yamaguchi
典生 山口
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • YGENERAL 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
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    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment method and apparatus which effectively use oxygen enriched air, which is a by-product gas of a nitrogen generator installed in semiconductor manufacturing facilities to realize a reduction of equipment cost as a total system, energy saving, space saving, and shortening of a purification time. <P>SOLUTION: In the treatment method and apparatus for purifying organic matter-containing wastewater, which is water to be treated, discharged from facilities using the nitrogen generator 1 producing high-purity nitrogen by separation from stock air, the oxygen-enriched air secondarily generated in the nitrogen generator 1 is supplied to the water 17 to be treated stored in an aerobic treatment tank 16 to aerate and purify the water 17 to be treated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、半導体製造工場等から排出される排水を曝気して、好気性微生物により処理する排水処理方法及び排水処理装置に関するものである。   The present invention relates to a wastewater treatment method and a wastewater treatment apparatus in which wastewater discharged from a semiconductor manufacturing factory or the like is aerated and treated with aerobic microorganisms.

従来、好気性処理槽(曝気槽)内の被処理水に空気を供給して曝気処理が行われているが、供給する空気の酸素濃度を高めて好気性微生物をより活性化させて浄化処理能力を向上させるとともに、好気性処理槽の省スペース化、酸素を富化した空気の供給手段であるブロア、ポンプ、コンプレッサーの小型化等を図るものが開発されている。従来この排水処理方法、装置の代表的なものとして下記のものが知られている。   Conventionally, aeration treatment is performed by supplying air to the water to be treated in an aerobic treatment tank (aeration tank), but purification is performed by increasing the oxygen concentration of the supplied air to activate aerobic microorganisms more. In order to improve the capacity, space saving of an aerobic treatment tank and reduction in size of a blower, a pump, and a compressor which are means for supplying oxygen-enriched air have been developed. Conventionally, the following are known as typical wastewater treatment methods and apparatuses.

曝気槽と、曝気槽内の被処理水を導く被処理水導管と、酸素富化ガスを供給する酸素富化ガス供給管と、酸素富化ガス供給管を通して供給された酸素富化ガスを、被処理水導管を通して導かれた被処理水とともに曝気槽内に噴出させるエジェクタとを備え、曝気槽内には、ブロアに接続された散気管が設けられ、ブロアを用いて散気管を通して曝気槽内に空気を送り込むことができるようになっている。酸素富化ガス供給源は、液化酸素富化ガス貯蔵容器と、容器から取り出した液化酸素富化ガスを気化させる蒸発器を備えている。酸素富化ガスとしては、従来公知の吸着法などの方法により酸素濃度を高めた酸素富化空気や純酸素を用いるものである(例えば、特許文献1参照)。   An aeration tank, a treated water conduit for guiding the treated water in the aeration tank, an oxygen-enriched gas supply pipe for supplying oxygen-enriched gas, and an oxygen-enriched gas supplied through the oxygen-enriched gas supply pipe, And an ejector that is ejected into the aeration tank together with the treated water guided through the treated water conduit, and an aeration pipe connected to the blower is provided in the aeration tank. Air can be sent to the. The oxygen-enriched gas supply source includes a liquefied oxygen-enriched gas storage container and an evaporator that vaporizes the liquefied oxygen-enriched gas taken out from the container. As the oxygen-enriched gas, oxygen-enriched air or pure oxygen whose oxygen concentration is increased by a conventionally known adsorption method or the like is used (for example, see Patent Document 1).

また、導入された排水中のアンモニア性窒素を硝化菌により硝酸性窒素に酸化処理する密閉可能な硝化槽と、硝化槽内に純酸素又は酸素富化ガスを供給する酸素供給手段と、硝化槽内の排水に対する酸素の溶解を促進させるべく、硝化槽内の排水の液面と硝化槽の天井部との間の空間の気体を取り込み、当該気体を硝化槽内の排水に曝気する曝気手段とを備えることを特徴とする。この構成においては、密閉された硝化槽内に純酸素を供給し曝気することにより、排水への酸素の溶解率を高めて硝化反応を促進するもので、純酸素又は酸素富化ガスを供給する手段としてはPSA(プレッシャースイング吸着方式)酸素供給装置とを備えているものである(例えば、特許文献2参照)。
特開2000−312896号公報 特開2004−298674号公報
Also, a sealable nitrification tank that oxidizes ammonia nitrogen in the introduced wastewater to nitrate nitrogen by nitrifying bacteria, an oxygen supply means that supplies pure oxygen or oxygen-enriched gas into the nitrification tank, and a nitrification tank An aeration means for taking in the gas in the space between the liquid level of the waste water in the nitrification tank and the ceiling of the nitrification tank and aerating the gas to the waste water in the nitrification tank in order to promote the dissolution of oxygen in the waste water in the nitrification tank; It is characterized by providing. In this configuration, pure oxygen or oxygen-enriched gas is supplied by supplying pure oxygen into a sealed nitrification tank and aeration so as to increase the dissolution rate of oxygen in the waste water and promote the nitrification reaction. As a means, a PSA (pressure swing adsorption method) oxygen supply device is provided (for example, see Patent Document 2).
JP 2000-312896 A JP 2004-298664 A

前記、特許文献1、特許文献2に記載された排水処理においては、曝気に用いる酸素富化ガス供給源として、排水処理装置のために専用に設置した液化酸素富化ガス貯蔵容器と液化酸素富化ガスを気化させる蒸発器、またはPSA(プレッシャースイング吸着方式)酸素供給装置を備えるものである。このため酸素富化空気を得るための設備コストや運転コストも多大なものとなる。さらに設置に大きなスペースを必要とし、日常的なメンテナンスも必要となる。一方、半導体製造設備に併設されている深冷分離式窒素製造装置で副次的に生成される酸素富化空気は、大気に放出されており有効に活用されていない。   In the waste water treatment described in Patent Document 1 and Patent Document 2, as a oxygen-enriched gas supply source used for aeration, a liquefied oxygen-enriched gas storage container specially installed for a waste water treatment apparatus and a liquefied oxygen-enriched container are provided. It comprises an evaporator for vaporizing the gasified gas or a PSA (pressure swing adsorption method) oxygen supply device. For this reason, the equipment cost and operation cost for obtaining oxygen-enriched air also become great. Furthermore, a large space is required for installation, and daily maintenance is also required. On the other hand, oxygen-enriched air that is secondarily generated by a cryogenic separation type nitrogen production apparatus installed in a semiconductor production facility is released into the atmosphere and is not effectively utilized.

本発明は、前記従来の課題を解決するもので、高純度窒素ガスを使用する半導体製造設備や液晶製造設備等(本発明では、これらを総称して半導体製造設備という)において、洗浄等に用いられて有機物を含む排水の浄化処理にあたり、前記半導体製造設備に備える窒素製造装置の副生成ガスである酸素富化空気を有効に利用し、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化と、浄化処理時間の短縮を図った排水処理方法を提供することを目的とするものである。   The present invention solves the above-described conventional problems, and is used for cleaning and the like in semiconductor manufacturing equipment and liquid crystal manufacturing equipment using high-purity nitrogen gas (in the present invention, these are collectively referred to as semiconductor manufacturing equipment). In the purification process of wastewater containing organic matter, the oxygen-enriched air, which is a by-product gas of the nitrogen production equipment provided in the semiconductor production equipment, is effectively used to reduce the equipment cost as a total system and save energy and space. An object of the present invention is to provide a wastewater treatment method that reduces the purification time.

本発明の排水処理方法及び排水処理装置は、原料空気から分離して窒素ガスを製造する窒素製造装置を用いている施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とするものである。   The wastewater treatment method and wastewater treatment apparatus of the present invention are the purification treatment of wastewater containing organic matter that is treated water discharged from a facility using a nitrogen production apparatus that produces nitrogen gas by separating from raw material air, Oxygen-enriched air that is secondarily generated in the nitrogen production apparatus is supplied to the treated water stored in the aerobic treatment tank and aerated to purify the treated water. It is.

本発明の排水処理方法によれば、半導体製造設備に備える窒素製造装置の副生成ガスである酸素富化空気を有効に利用し、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化と、浄化処理時間の短縮を図ることができる。   According to the wastewater treatment method of the present invention, oxygen-enriched air, which is a by-product gas of a nitrogen production apparatus provided in a semiconductor production facility, is effectively used to reduce facility costs as a total system and save energy and space. The purification processing time can be shortened.

第1の発明は、原料空気から分離して窒素ガスを製造する窒素製造装置を用いている施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とする排水処理方法としたものである。これによって、半導体製造設備に備える窒素製造装置の副生成ガスである酸素富化空気を有効に利用し、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化と、浄化処理時間の短縮を図ることができる。   1st invention is a purification process of the waste_water | drain containing the organic substance which is the to-be-processed water discharged | emitted from the plant | facility which uses the nitrogen manufacturing apparatus which isolate | separates from raw material air and produces | generates nitrogen gas. The waste water treatment method is characterized in that the oxygen-enriched air generated is supplied to the treated water stored in the aerobic treatment tank and aerated, and the treated water is purified. is there. This effectively utilizes oxygen-enriched air, which is a by-product gas of nitrogen production equipment in semiconductor manufacturing equipment, reducing equipment costs as a total system, saving energy, saving space, and reducing purification processing time. Can be planned.

第2の発明は、第1の発明において、酸素富化空気を、好気性処理槽の上流側に位置する流量調整槽内の被処理水に供給して曝気することを特徴とする排水処理方法としたものである。これによって、好気性処理槽での曝気負荷の削減、迅速な目標溶存酸素濃度への制御を可能にして、より一層浄化処理時間の短縮を図ることができる。さらに流量調整槽、好気性処理槽内の被処理水への曝気用気体の送風量を抑えられることによるブロアの小型化、消費電力の削減、騒音の抑制を図ることができる。   According to a second aspect of the invention, in the first aspect of the invention, the oxygen-enriched air is supplied to the water to be treated in the flow rate adjustment tank located upstream of the aerobic treatment tank and aerated. It is what. This makes it possible to reduce the aeration load in the aerobic treatment tank and to quickly control the target dissolved oxygen concentration, thereby further shortening the purification treatment time. Furthermore, it is possible to reduce the size of the blower, reduce power consumption, and suppress noise by suppressing the amount of aeration gas blown into the water to be treated in the flow rate adjustment tank and the aerobic treatment tank.

第3の発明は、第1または2の発明において、被処理水への酸素富化空気の供給量を調節することによって、前記被処理水の溶存酸素濃度を制御することを特徴とする排水処理方法としたものである。これによって、被処理水の溶存酸素濃度を浄化処理に最適な値に制御することが可能となり処理時間の短縮を図ることができる。   A third invention is characterized in that, in the first or second invention, the concentration of dissolved oxygen in the water to be treated is controlled by adjusting the supply amount of oxygen-enriched air to the water to be treated. It is a method. As a result, the dissolved oxygen concentration of the water to be treated can be controlled to an optimum value for the purification treatment, and the treatment time can be shortened.

第4の発明は、第3の発明において、酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することを特徴とする排水処理方法としたものである。これによって、被処理水への酸素富化空気の供給量を調節するとともに、曝気用の気体の総量を調節することを可能として、被処理水の溶存酸素濃度をよりきめ細かく制御することができる。さらに曝気用の気体の総量を調節することで被処理水の攪拌を促進して汚泥の沈降、凝集を防止することができる。   According to a fourth aspect of the present invention, there is provided a wastewater treatment method according to the third aspect of the present invention, wherein the wastewater treatment method is characterized in that the mixing ratio of oxygen-enriched air and air in the atmosphere is adjusted and supplied to the water to be treated. Accordingly, the supply amount of oxygen-enriched air to the water to be treated can be adjusted, and the total amount of gas for aeration can be adjusted, so that the dissolved oxygen concentration of the water to be treated can be controlled more finely. Furthermore, by adjusting the total amount of gas for aeration, it is possible to promote the stirring of the water to be treated and prevent sedimentation and aggregation of sludge.

第5の発明は、第1〜4のいずれかの発明において、窒素製造装置から大気開放状態において酸素富化空気を吸引手段により吸引して被処理水に供給することを特徴とする排水処理方法としたものである。これによって、窒素製造装置からの酸素富化空気の吐出に対して流路抵抗の増加、圧力変動をなくし、窒素製造装置における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   A fifth invention is the wastewater treatment method according to any one of the first to fourth inventions, wherein the oxygen-enriched air is sucked by the suction means and supplied to the water to be treated from the nitrogen production apparatus in the open air state. It is what. This eliminates an increase in flow resistance and pressure fluctuation with respect to the discharge of oxygen-enriched air from the nitrogen production apparatus, and stably generates high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus. it can.

第6の発明は、第1〜5のいずれかの発明において、窒素製造装置は、深冷式窒素製造方法であることを特徴とする排水処理方法としたものである。これによって、半導体製造設備において窒素製造装置は常時連続して稼動しており、酸素富化空気も連続して得られ、さらに窒素製造装置を深冷分離式とすることで、酸素富化空気を比較的大量に得られることにより、流量調整槽および好気性処理槽内の被処理水に安定して供給することができる。   A sixth aspect of the present invention is the waste water treatment method according to any one of the first to fifth aspects, wherein the nitrogen production apparatus is a deep-cooled nitrogen production method. As a result, the nitrogen production apparatus is continuously operated in the semiconductor production facility, oxygen-enriched air is also obtained continuously, and the nitrogen production apparatus is made into a cryogenic separation type so that the oxygen-enriched air can be obtained. By being obtained in a relatively large amount, it can be stably supplied to the water to be treated in the flow rate adjustment tank and the aerobic treatment tank.

第7の発明は、原料空気から分離して窒素ガスを製造する窒素製造装置を用いている施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とする排水処理装置としたものである。これによって、半導体製造設備に備える窒素製造装置の副生成ガスである酸素富化空気を有効に利用し、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化と、浄化処理時間の短縮を図ることができる。   A seventh aspect of the invention relates to a purification process of wastewater containing organic matter, which is water to be treated, discharged from a facility using a nitrogen production apparatus that produces nitrogen gas separated from raw material air. The waste water treatment apparatus is characterized in that the oxygen-enriched air generated is supplied to the treated water stored in the aerobic treatment tank and aerated to purify the treated water. is there. This effectively utilizes oxygen-enriched air, which is a by-product gas of nitrogen production equipment in semiconductor manufacturing equipment, reducing equipment costs as a total system, saving energy, saving space, and reducing purification processing time. Can be planned.

第8の発明は、第7の発明において、酸素富化空気を、好気性処理槽の上流側に位置する流量調整槽内の被処理水に供給して曝気することを特徴とする排水処理装置としたものである。これによって、好気性処理槽での曝気負荷の削減、迅速な目標溶存酸素濃度への制御を可能にして、より一層浄化処理時間の短縮を図ることができる。さらに流量調整槽、好気性処理槽内の被処理水への曝気用気体の送風量を抑えられることによるブロアの小型化、消費電力の削減、騒音の抑制を図ることができる。   An eighth invention is the wastewater treatment apparatus according to the seventh invention, characterized in that oxygen-enriched air is supplied to the treated water in a flow rate adjustment tank located upstream of the aerobic treatment tank and aerated. It is what. This makes it possible to reduce the aeration load in the aerobic treatment tank and to quickly control the target dissolved oxygen concentration, thereby further shortening the purification treatment time. Furthermore, it is possible to reduce the size of the blower, reduce power consumption, and suppress noise by suppressing the amount of aeration gas blown into the water to be treated in the flow rate adjustment tank and the aerobic treatment tank.

第9の発明は、第7または8の発明において、被処理水への酸素富化空気の供給量を調節することによって、前記被処理水の溶存酸素濃度を制御することを特徴とする排水処理装置としたものである。これによって、被処理水の溶存酸素濃度を浄化処理に最適な値に制御することが可能となり処理時間の短縮を図ることができる。   A ninth invention is characterized in that, in the seventh or eighth invention, the dissolved oxygen concentration is controlled by adjusting the supply amount of oxygen-enriched air to the water to be treated. It is a device. As a result, the dissolved oxygen concentration of the water to be treated can be controlled to an optimum value for the purification treatment, and the treatment time can be shortened.

第10の発明は、第9の発明において、酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することを特徴とする排水処理装置としたものである。これによって、被処理水への酸素富化空気の供給量を調節するとともに、曝気用の気体の総量を調節することを可能として、被処理水の溶存酸素濃度をよりきめ細かく制御することができる。さらに曝気用の気体の総量を調節することで被処理水の攪拌を促進して汚泥の沈降、凝集を防止することができる。   A tenth aspect of the invention is the waste water treatment apparatus according to the ninth aspect of the invention, wherein the waste water treatment apparatus is characterized in that the mixing ratio of oxygen-enriched air and air in the atmosphere is adjusted and supplied to the water to be treated. Accordingly, the supply amount of oxygen-enriched air to the water to be treated can be adjusted, and the total amount of gas for aeration can be adjusted, so that the dissolved oxygen concentration of the water to be treated can be controlled more finely. Furthermore, by adjusting the total amount of gas for aeration, it is possible to promote the stirring of the water to be treated and prevent sedimentation and aggregation of sludge.

第11の発明は、第7〜10のいずれかの発明において、窒素製造装置から大気開放状態において酸素富化空気を吸引手段により吸引して被処理水に供給することを特徴とする排水処理装置としたものである。これによって、窒素製造装置からの酸素富化空気の吐出に対して流路抵抗の増加、圧力変動をなくし、窒素製造装置における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   An eleventh aspect of the invention is the waste water treatment apparatus according to any one of the seventh to tenth aspects of the invention, wherein oxygen-enriched air is sucked by the suction means from the nitrogen production apparatus and is supplied to the water to be treated. It is what. This eliminates an increase in flow resistance and pressure fluctuation with respect to the discharge of oxygen-enriched air from the nitrogen production apparatus, and stably generates high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus. it can.

第12の発明は、第7〜11のいずれかの発明において、窒素製造装置は、深冷式窒素製造方法であることを特徴とする排水処理装置としたものである。これによって、半導体製造設備において窒素製造装置は常時連続して稼動しており、酸素富化空気も連続して得られ、さらに窒素製造装置を深冷分離式とすることで、酸素富化空気を比較的大量に得られることにより、流量調整槽および好気性処理槽内の被処理水に安定して供給することができる。   In a twelfth aspect of the invention according to any one of the seventh to eleventh aspects, the nitrogen production apparatus is a wastewater treatment apparatus characterized by being a deep-cooled nitrogen production method. As a result, the nitrogen production apparatus is continuously operated in the semiconductor production facility, oxygen-enriched air is also obtained continuously, and the nitrogen production apparatus is made into a cryogenic separation type so that the oxygen-enriched air can be obtained. By being obtained in a relatively large amount, it can be stably supplied to the water to be treated in the flow rate adjustment tank and the aerobic treatment tank.

以下、本発明の実施例の排水処理方法を図1〜図2を参照しながら説明する。図1は排水処理装置の基本構成図、図2は窒素製造装置の構成を示す系統図である。なお図中の実線矢印は酸素富化空気の流れを示す。   Hereinafter, a wastewater treatment method according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a basic configuration diagram of a wastewater treatment apparatus, and FIG. 2 is a system diagram showing a configuration of a nitrogen production apparatus. In addition, the solid line arrow in a figure shows the flow of oxygen-enriched air.

図1、図2において、深冷分離式からなる窒素製造装置1で空気を深冷液化分離することによって得られた高純度窒素ガスは、配管2を介して半導体製造設備のユースポイント3へ供給する。このユースポイント3は、シランやアルシンのような半導体材料ガスの希釈用、ドーピングガスのキャリア用、製造ラインのパージ用、基板搬送等の雰囲気用といった種々の機器で様々な用途に使用される。また窒素製造装置1において高純度窒素ガス生成と同時に副次的に生成される酸素富化空気は、窒素製造装置1に付属の配管4の先端部の吐出口4aから吐出するよう構成している。   In FIG. 1 and FIG. 2, high-purity nitrogen gas obtained by cryogenic liquefaction separation of air by a cryogenic separation type nitrogen production apparatus 1 is supplied to a use point 3 of a semiconductor production facility via a pipe 2. To do. This use point 3 is used for various applications such as diluting semiconductor material gases such as silane and arsine, doping gas carrier, manufacturing line purging, and substrate atmosphere. Further, the oxygen-enriched air that is secondarily generated simultaneously with the generation of high-purity nitrogen gas in the nitrogen production apparatus 1 is configured to be discharged from the discharge port 4a at the tip of the pipe 4 attached to the nitrogen production apparatus 1. .

半導体製造設備において洗浄等に使用された有機物を含む排水を、配管7を介して流量調整槽5に供給し被処理水6として所定量貯留する。流量調整槽5の被処理水6中に位置して複数の散気孔9を有する散気管8および溶存酸素濃度検出器13を設け、散気管8は配管10を介してブロア11(吸引手段)に接続している。また流量調整槽5の底部には開閉弁12aを有する排水用の配管12を接続している。   Wastewater containing organic substances used for cleaning or the like in the semiconductor manufacturing facility is supplied to the flow rate adjusting tank 5 through the pipe 7 and stored as a treated water 6 in a predetermined amount. A diffuser tube 8 having a plurality of diffuser holes 9 and a dissolved oxygen concentration detector 13 are provided in the treated water 6 of the flow rate adjusting tank 5, and the diffuser tube 8 is connected to the blower 11 (suction means) via the pipe 10. Connected. A drainage pipe 12 having an on-off valve 12a is connected to the bottom of the flow rate adjusting tank 5.

流量調整槽5内の被処理水6を、配管15を介してポンプ14により好気性処理槽16に供給し、好気性処理槽16内に被処理水17として所定量貯留する。好気性処理槽16内の被処理水17中に位置して複数の散気孔19を有する散気管18および溶存酸素濃度検出器24を設け、散気管18は配管22を介してブロア23(吸引手段)に接続している。また好気性処理槽16の底部には開閉弁21を有する排水用の配管20を接続している。   The treated water 6 in the flow rate adjusting tank 5 is supplied to the aerobic treating tank 16 by the pump 14 through the pipe 15 and stored in the aerobic treating tank 16 as the treated water 17. A diffuser pipe 18 having a plurality of diffuser holes 19 and a dissolved oxygen concentration detector 24 are provided in the water to be treated 17 in the aerobic treatment tank 16, and the diffuser pipe 18 is connected to a blower 23 (suction means) via a pipe 22. ) Is connected. A drainage pipe 20 having an on-off valve 21 is connected to the bottom of the aerobic treatment tank 16.

好気性処理槽16内で生物処理された処理水は、配管25を介して沈殿槽26に流れ、処理水27として所定量貯留する。沈殿槽26において汚泥分を沈殿させてこれを分離し配管28より放水する。沈殿槽26において沈殿した汚泥は配管29を介してポンプ30により好気性処理槽16に適宜返送するか、配管31を介して開閉弁32より排出する。   The treated water that has been biologically treated in the aerobic treatment tank 16 flows into the settling tank 26 via the pipe 25 and is stored as a treated water 27 in a predetermined amount. In the sedimentation tank 26, sludge is precipitated and separated and discharged from the pipe 28. The sludge precipitated in the settling tank 26 is appropriately returned to the aerobic treatment tank 16 by the pump 30 through the pipe 29 or discharged from the on-off valve 32 through the pipe 31.

前記ブロア23の吸入口近傍に配管33の一端が開放され、この配管33の他端部には酸素富化空気を吸引する吸引部34を構成している。この吸引部34は、窒素製造装置1で得られた酸素富化空気を吐出する配管4の先端部の吐出口4aを囲うように配管33の吸引口33aを位置させ、吐出口4aと吸引口33aは開口35を形成させて大気開放状態で連通させている。またブロア23と吸引部34とを接続する配管33の途中には3方調節弁36を位置させ、吸引部34から吸引する酸素富化空気と配管37から吸引する大気との吸引量を調節する。ここでブロア23の吸込み近傍への、配管33から酸素富化空気の吐出は図1に示すように、吸引部34と同様の構成を取っている。   One end of a pipe 33 is opened near the suction port of the blower 23, and a suction part 34 for sucking oxygen-enriched air is formed at the other end of the pipe 33. This suction part 34 positions the suction port 33a of the pipe 33 so as to surround the discharge port 4a at the tip of the pipe 4 for discharging the oxygen-enriched air obtained by the nitrogen production apparatus 1, and the discharge port 4a and the suction port 33a forms an opening 35 and communicates in an open state. A three-way control valve 36 is positioned in the middle of the pipe 33 connecting the blower 23 and the suction part 34 to adjust the suction amount between the oxygen-enriched air sucked from the suction part 34 and the air sucked from the pipe 37. . Here, the discharge of oxygen-enriched air from the pipe 33 to the vicinity of the suction of the blower 23 has the same configuration as that of the suction portion 34 as shown in FIG.

さらに、前記ブロア11の吸入口近傍に配管33から分岐した配管38の一端が開放され、配管38の途中には3方調節弁39を位置させ、吸引部34から吸引する酸素富化空気と配管40から吸引する大気との吸引量を調節する。なお酸素富化空気を吸引する配管33、38は、金属、樹脂等の材質で構成すればよく、また屈曲自在なダクトを用いることができる。ここでブロア11の吸込み近傍への、配管38から酸素富化空気の吐出は図1に示すように、吸引部34と同様の構成を取っている。   Further, one end of a pipe 38 branched from the pipe 33 is opened in the vicinity of the suction port of the blower 11, and a three-way control valve 39 is positioned in the middle of the pipe 38, and oxygen-enriched air sucked from the suction part 34 and the pipe The amount of suction with the air sucked from 40 is adjusted. The pipes 33 and 38 for sucking oxygen-enriched air may be made of a material such as metal or resin, and a bendable duct can be used. Here, the discharge of oxygen-enriched air from the pipe 38 to the vicinity of the suction of the blower 11 has the same configuration as that of the suction portion 34 as shown in FIG.

次に、原料空気を深冷液化分離することによって高純度窒素ガスおよび酸素富化空気を製造する深冷分離式の窒素製造装置1の基本構成を図2により説明する。フィルター41で粉塵を除去し、吸入された原料空気は、圧縮機42で所定の圧力に圧縮され、クーラー43で圧縮熱を除去された後、配管44を介して吸着器45に導入され、ここで空気中の水分、二酸化炭素等の不純物が除去される。吸着器45を導出した精製原料空気は、配管46を経て熱交換器47に導入され、ここで冷流体である高純度窒素ガスの戻りガスと熱交換を行うことによって冷却され、配管48を経て精留塔49の下部に導入される。精留塔49での液化精留により、原料空気は塔上部の窒素ガスと塔下部の酸素富化液化空気とに分離し、精留塔49の上部に分離した窒素ガスは、通常99.99%以上の純度の高純度窒素ガスとなる。   Next, a basic configuration of a cryogenic separation type nitrogen production apparatus 1 that produces high-purity nitrogen gas and oxygen-enriched air by subjecting raw material air to cryogenic liquefaction separation will be described with reference to FIG. Dust is removed by a filter 41, and the sucked raw material air is compressed to a predetermined pressure by a compressor 42, heat of compression is removed by a cooler 43, and then introduced into an adsorber 45 through a pipe 44. Thus, impurities such as moisture and carbon dioxide in the air are removed. The purified raw material air led out from the adsorber 45 is introduced into a heat exchanger 47 through a pipe 46, where it is cooled by exchanging heat with a return gas of high-purity nitrogen gas, which is a cold fluid, and passes through a pipe 48. It is introduced into the lower part of the rectifying column 49. By liquefaction rectification in the rectifying column 49, the raw air is separated into nitrogen gas at the upper part of the tower and oxygen-enriched liquefied air at the lower part of the tower, and the nitrogen gas separated at the upper part of the rectifying tower 49 is usually 99.99. % High purity nitrogen gas with a purity of at least%.

前記窒素ガスは、精留塔49の上部から配管50に抜き出され、熱交換器47に導入される。この窒素ガスは、熱交換器47で前記原料空気と熱交換を行うことによって冷流体(冷温状態)の窒素ガスからの冷熱を回収された後、熱交換器47から配管2に導出され、前記配管2を通って各半導体製造装置のユースポイント3にそれぞれ供給される。   The nitrogen gas is extracted from the upper part of the rectifying column 49 into the pipe 50 and introduced into the heat exchanger 47. The nitrogen gas is heat-exchanged with the raw material air in the heat exchanger 47 to recover cold heat from the cold fluid (cold temperature) nitrogen gas, and is then led out from the heat exchanger 47 to the pipe 2. It is supplied to the use point 3 of each semiconductor manufacturing apparatus through the pipe 2.

一方、精留塔49の下部には、酸素濃度が略30%の酸素富化液化空気が分離する。この酸素富化液化空気は、精留塔49の下部から配管51に導出され、減圧弁52で例えば0.2〜0.5MPaに減圧された後、配管53を経て熱交換器47に導入され、ここで前記窒素ガスと熱交換を行い、加温されることにより気化して酸素富化空気となる。この酸素富化空気は配管4に導出される。   On the other hand, oxygen-enriched liquefied air having an oxygen concentration of about 30% is separated at the bottom of the rectifying column 49. This oxygen-enriched liquefied air is led out from the lower part of the rectifying column 49 to the pipe 51, and is decompressed to, for example, 0.2 to 0.5 MPa by the pressure reducing valve 52, and then introduced into the heat exchanger 47 through the pipe 53. Here, heat exchange is performed with the nitrogen gas, and it is vaporized by heating to become oxygen-enriched air. This oxygen-enriched air is led to the pipe 4.

なお、前記吸引部34は、窒素製造装置1に付属の配管4の吐出口4aの近傍に位置させている。さらに吸引部34は配管4、吐出口4aには何らの変更を加えずに構成しており、酸素富化空気を吐出する配管4の先端部の吐出口4aを囲うように配管33の吸引口33aを位置させ、吐出口4aと吸引口33aは開口35を形成させて大気開放状態で連通させている。これによって、高純度窒素ガスを使用する半導体製造設備に備えている窒素製造装置1自体をそのまま使用することができ、さらに窒素製造装置1からの酸素富化空気の吐出に対して流路抵抗の増加、圧力変動をなくし、窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   The suction part 34 is located in the vicinity of the discharge port 4 a of the pipe 4 attached to the nitrogen production apparatus 1. Further, the suction part 34 is configured without any changes to the pipe 4 and the discharge port 4a, and the suction port of the pipe 33 so as to surround the discharge port 4a at the tip of the pipe 4 that discharges oxygen-enriched air. 33a is positioned, and the discharge port 4a and the suction port 33a form an opening 35 and communicate with each other in an open state. As a result, the nitrogen production apparatus 1 itself provided in the semiconductor production facility using high-purity nitrogen gas can be used as it is, and further, the flow resistance is reduced against the discharge of oxygen-enriched air from the nitrogen production apparatus 1. The increase and pressure fluctuation can be eliminated, and the production of high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus 1 can be performed stably.

次に、本実施例の基本的な動作を説明する。窒素製造装置1で得られた酸素富化空気は、配管4を介して送られ先端部の吐出口4aから吸引部34に吐出する。さらに吐出口4aから吐出した酸素富化空気は、ブロア23の駆動により吸引され、配管22、散気管18、散気孔19を介して好気性処理槽16内の被処理水17に供給される。これにより好気性処理槽16内の被処理水17に酸素が供給され好気性微生物による浄化作用により被処理水17中の有機物を分解する。このとき三方調節弁36は配管33から酸素富化空気のみを通す通路に制御し、配管37から大気中の空気の流入は遮断されている。   Next, the basic operation of this embodiment will be described. The oxygen-enriched air obtained by the nitrogen production apparatus 1 is sent through the pipe 4 and discharged from the discharge port 4a at the tip to the suction unit 34. Further, the oxygen-enriched air discharged from the discharge port 4 a is sucked by driving the blower 23 and supplied to the water to be treated 17 in the aerobic treatment tank 16 through the pipe 22, the air diffuser 18 and the air diffuser 19. As a result, oxygen is supplied to the water to be treated 17 in the aerobic treatment tank 16, and the organic matter in the water to be treated 17 is decomposed by the purification action by the aerobic microorganisms. At this time, the three-way control valve 36 controls the passage through which only oxygen-enriched air passes from the pipe 33, and the inflow of air in the atmosphere from the pipe 37 is blocked.

好気性処理槽16で有機物を分解し浄化処理した処理水は、配管25を介して沈殿槽26に入り汚泥(活性汚泥)を分離し、処理水の浄化レベルを確認した後、配管28より外部に放水するものである。沈殿槽26に沈殿した汚泥は、必要に応じ配管29を介してポンプ30を駆動し、好気性処理槽16に返送する。また余剰となった汚泥は、配管31を介して開閉弁32を開として外部に排出する。   The treated water that decomposes and purifies the organic matter in the aerobic treatment tank 16 enters the sedimentation tank 26 through the pipe 25, separates sludge (activated sludge), confirms the purification level of the treated water, and then passes through the pipe 28 to the outside. It is intended to discharge water. The sludge precipitated in the sedimentation tank 26 is returned to the aerobic treatment tank 16 by driving the pump 30 through the pipe 29 as necessary. The surplus sludge is discharged to the outside through the pipe 31 by opening the on-off valve 32.

好気性処理槽16で有機物を含む被処理水17の浄化処理量に応じて、流量調整槽5から配管15を介してポンプ14を駆動し被処理水6を好気性処理槽16に供給する。このときポンプ14を連続駆動または間欠的に駆動し、流量調整槽5から被処理水6を好気性処理槽16に供給する。   The pump 14 is driven from the flow rate adjustment tank 5 through the pipe 15 to supply the water to be treated 6 to the aerobic treatment tank 16 in accordance with the purification amount of the water to be treated 17 containing organic matter in the aerobic treatment tank 16. At this time, the pump 14 is driven continuously or intermittently, and the treated water 6 is supplied from the flow rate adjustment tank 5 to the aerobic treatment tank 16.

前記したように、吸引部34の構成は、窒素製造装置1で得られた酸素富化空気を吐出する配管4の先端部の吐出口4aを囲うように配管33の吸引口33aを位置させ、吐出口4aと吸引口33aは開口35を形成させて大気開放状態で接続している。吐出口4aと吸引口33aに設けた開口35は、ブロア23を停止状態または三方調節弁36を配管37から大気中の空気のみをブロア23で吸引する状況において、窒素製造装置1で得られた酸素富化空気を吐出口4aから吐出する際に、流路抵抗とならないように十分な開口通路断面積を有するよう設定している。これによりいかなる状況においても、酸素富化空気の吐出に対して流路抵抗の増加をなくし、窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができるものである。   As described above, the configuration of the suction unit 34 is such that the suction port 33a of the pipe 33 is positioned so as to surround the discharge port 4a at the tip of the pipe 4 that discharges the oxygen-enriched air obtained by the nitrogen production apparatus 1. The discharge port 4a and the suction port 33a form an opening 35 and are connected in an open state. The opening 35 provided in the discharge port 4a and the suction port 33a was obtained in the nitrogen production apparatus 1 in a state where the blower 23 was stopped or the three-way control valve 36 was sucked only air in the atmosphere from the pipe 37 by the blower 23. When the oxygen-enriched air is discharged from the discharge port 4a, it is set so as to have a sufficient opening passage cross-sectional area so as not to cause flow resistance. As a result, in any situation, the flow resistance is not increased with respect to the discharge of the oxygen-enriched air, and the production of high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus 1 can be performed stably. is there.

また、ブロア23を駆動し配管33を介して吸引部34から酸素富化空気を最大量吸引する状況においても、吐出口4aは大気開放状態となっていることおよび開口35が十分な開口通路断面積を有していることから、窒素製造装置1に接続した配管4および吐出口4a内に圧力変動を生じることがない。したがって窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができるものである。また窒素製造装置1から配管4の吐出口4aに至る経路に開閉弁を設けていないので、開閉弁およびこの開閉弁を制御する制御器の故障による窒素製造装置1からの酸素富化空気の吐出を遮断してしまう問題を生じることがない。   Even in a situation where the blower 23 is driven and the maximum amount of oxygen-enriched air is sucked from the suction portion 34 via the pipe 33, the discharge port 4a is open to the atmosphere and the opening 35 is sufficiently closed. Since it has an area, pressure fluctuation does not occur in the pipe 4 and the discharge port 4a connected to the nitrogen production apparatus 1. Therefore, high-purity nitrogen gas and oxygen-enriched air can be stably generated in the nitrogen production apparatus 1. Moreover, since no on-off valve is provided in the path from the nitrogen production apparatus 1 to the discharge port 4a of the pipe 4, the discharge of oxygen-enriched air from the nitrogen production apparatus 1 due to the failure of the on-off valve and the controller that controls the on-off valve. There is no problem of shutting off.

次に、好気性処理槽16で有機物を分解し浄化処理する際の、被処理水17への酸素富化空気の供給方法について説明する。溶存酸素濃度検出器24により検出した被処理水17の溶存酸素濃度が所定値よりも低い場合には、ブロア23の駆動回転数を上げ、吸引部34に吐出した酸素富化空気を、配管33を介して吸引し、さらに配管22、散気管18、散気孔19を介して被処理水17中に供給し曝気を行う。このとき三方調節弁36は配管33側からのみの通路を開としてある。   Next, a method for supplying oxygen-enriched air to the water to be treated 17 when the organic matter is decomposed and purified in the aerobic treatment tank 16 will be described. When the dissolved oxygen concentration of the water to be treated 17 detected by the dissolved oxygen concentration detector 24 is lower than a predetermined value, the driving speed of the blower 23 is increased, and the oxygen-enriched air discharged to the suction unit 34 is supplied to the pipe 33. Then, the air is aerated by supplying it into the water to be treated 17 through the pipe 22, the air diffuser 18 and the air diffuser 19. At this time, the three-way control valve 36 opens the passage only from the pipe 33 side.

前記状態における吸引部34において、吐出口4aから吐出した酸素富化空気は、吐出口4aと吸引口33aとの開口35部分に滞留し、この滞留した酸素富化空気を配管33に吸引する。吐出口4aから吐出した酸素富化空気の量が、配管33に吸引する酸素富化空気の量よりも多い場合には、開口35部分から酸素富化空気の一部が大気中に放出される。したがって被処理水17には、窒素製造装置1で生成した酸素富化空気のみにより曝気を行う。また余剰となった酸素富化空気の一部が大気中に放出されることによって、酸素富化空気の吐出に対して流路抵抗の増加をなくし、窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   In the suction portion 34 in the above state, the oxygen-enriched air discharged from the discharge port 4 a stays in the opening 35 portion between the discharge port 4 a and the suction port 33 a, and the retained oxygen-enriched air is sucked into the pipe 33. When the amount of oxygen-enriched air discharged from the discharge port 4a is larger than the amount of oxygen-enriched air sucked into the pipe 33, a part of the oxygen-enriched air is released from the opening 35 into the atmosphere. . Therefore, the water to be treated 17 is aerated only with the oxygen-enriched air generated by the nitrogen production apparatus 1. Further, part of the surplus oxygen-enriched air is released into the atmosphere, thereby eliminating an increase in flow path resistance with respect to the discharge of oxygen-enriched air, and the high-purity nitrogen gas and oxygen in the nitrogen production apparatus 1 Enriched air can be generated stably.

また、吐出口4aから吐出した酸素富化空気の量が、配管33に吸引する酸素富化空気の量よりも少ない場合には、開口35部分から大気中の空気が吸引され吐出口4aから吐出した酸素富化空気と大気中の空気との混合空気として被処理水17中に供給し曝気を行う。このように、ブロア23を駆動し配管33を介して吸引部34から酸素富化空気を最大量吸引する状況においても、吐出口4aは大気開放状態となっていることおよび開口35が十分な開口通路断面積を有していることから、窒素製造装置1に接続した配管4内に圧力変動を生じることがない。したがって窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   When the amount of oxygen-enriched air discharged from the discharge port 4a is smaller than the amount of oxygen-enriched air sucked into the pipe 33, air in the atmosphere is sucked from the opening 35 and discharged from the discharge port 4a. Aeration is performed by supplying the mixed water of the oxygen-enriched air and the air in the atmosphere into the water to be treated 17. Thus, even in a situation where the blower 23 is driven and the maximum amount of oxygen-enriched air is sucked from the suction portion 34 via the pipe 33, the discharge port 4a is open to the atmosphere and the opening 35 is sufficiently open. Since it has a passage cross-sectional area, pressure fluctuation does not occur in the pipe 4 connected to the nitrogen production apparatus 1. Accordingly, it is possible to stably generate high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus 1.

また、溶存酸素濃度検出器24により検出した被処理水17の溶存酸素濃度が所定値に近似または高い場合には、ブロア23の駆動回転数を下げる。これによって吐出口4aと吸引口33aとの開口35部分に滞留した酸素富化空気の配管33への吸引量を減少させ、被処理水17への過剰な曝気を防止する。吸引部34においては、開口35部分から酸素富化空気の一部が大気中に放出される。   Further, when the dissolved oxygen concentration of the water to be treated 17 detected by the dissolved oxygen concentration detector 24 is close to or higher than a predetermined value, the drive rotational speed of the blower 23 is decreased. As a result, the amount of oxygen-enriched air retained in the opening 35 between the discharge port 4a and the suction port 33a is reduced to the pipe 33, and excessive aeration of the water to be treated 17 is prevented. In the suction part 34, part of the oxygen-enriched air is released into the atmosphere from the opening 35 part.

さらに、この状況における運転においても被処理水17への過剰な曝気となる場合には、三方調節弁36を配管37側からのみの通路を開とし、大気中の空気のみをブロア23により吸引し被処理水17に供給する。さらに過剰な曝気となる場合にはブロア23の駆動を停止する。   Further, in the operation in this situation, when excessive aeration to the water to be treated 17 is performed, the three-way control valve 36 is opened only from the pipe 37 side, and only air in the atmosphere is sucked by the blower 23. Supply to the treated water 17. If excessive aeration occurs, the drive of the blower 23 is stopped.

吐出口4aと吸引口33aに設けた開口35は、ブロア23を停止状態または三方調節弁36を管37から大気中の空気のみをブロア23で吸引する状況において、窒素製造装置1で得られた酸素富化空気を吐出口4aから吐出する際に、流路抵抗とならないように十分な開口通路断面積を有するよう設定している。これによりいかなる状況においても、酸素富化空気の吐出に対して流路抵抗の増加をなくし、窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができるものである。   The opening 35 provided in the discharge port 4a and the suction port 33a was obtained in the nitrogen production apparatus 1 in a state where the blower 23 was stopped or the three-way control valve 36 was sucked only air in the atmosphere from the pipe 37 by the blower 23. When the oxygen-enriched air is discharged from the discharge port 4a, it is set so as to have a sufficient opening passage cross-sectional area so as not to cause flow resistance. As a result, in any situation, the flow resistance is not increased with respect to the discharge of the oxygen-enriched air, and the production of high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus 1 can be performed stably. is there.

以上のように、ブロア23の駆動回転数を制御することによって、被処理水17への酸素富化空気の供給量を調節し、前記被処理水の溶存酸素濃度を制御する。また被処理水17への酸素富化空気の供給量の調節は、配管33側からの酸素富化空気の吸引量と配管37側からの大気中の空気の吸引量の比率を、三方調節弁36の開度調節によって行うことができる。この場合には酸素富化空気と大気中の空気との混合気体のうち、三方調節弁36の開度調節によって酸素富化空気の吸引量を無段階に調節し、酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することによって、前記被処理水の溶存酸素濃度を制御するものである。   As described above, by controlling the drive rotation speed of the blower 23, the supply amount of oxygen-enriched air to the water to be treated 17 is adjusted, and the dissolved oxygen concentration of the water to be treated is controlled. The supply amount of oxygen-enriched air to the water to be treated 17 is adjusted by adjusting the ratio between the amount of oxygen-enriched air sucked from the pipe 33 side and the amount of air sucked from the pipe 37 side in the atmosphere. This can be done by adjusting the opening of 36. In this case, of the mixed gas of oxygen-enriched air and air in the atmosphere, the suction amount of oxygen-enriched air is adjusted steplessly by adjusting the opening of the three-way control valve 36, and the oxygen-enriched air and air The dissolved oxygen concentration of the to-be-treated water is controlled by adjusting the air mixing ratio and supplying it to the to-be-treated water.

また、被処理水17へ供給する曝気用の酸素富化空気と大気中の空気との混合気体の量は、ブロア23の駆動回転数を制御することによって調節する。このように被処理水17への酸素富化空気の供給量を調節するとともに、曝気用の気体の総量を調節することを可能として、被処理水の溶存酸素濃度をよりきめ細かく制御することができる。さらに曝気用の気体の総量を調節することで被処理水17の攪拌を促進して汚泥の沈降、凝集を防止し、好気性処理槽16内の被処理水17の浄化を促進することができる。   Further, the amount of the mixed gas of the oxygen-enriched air for aeration supplied to the water to be treated 17 and the air in the atmosphere is adjusted by controlling the rotational speed of the blower 23. As described above, the supply amount of the oxygen-enriched air to the water to be treated 17 can be adjusted, and the total amount of aeration gas can be adjusted, so that the dissolved oxygen concentration of the water to be treated can be controlled more finely. . Furthermore, by adjusting the total amount of gas for aeration, the agitation of the water to be treated 17 can be promoted to prevent sedimentation and aggregation of the sludge, and the purification of the water to be treated 17 in the aerobic treatment tank 16 can be promoted. .

次に、流量調整槽5の被処理水6への酸素富化空気の供給方法について説明する。溶存酸素濃度検出器13により検出した被処理水6の溶存酸素濃度が所定値よりも低い場合には、ブロア11(吸引手段)の駆動回転数を上げ、吸引部34に吐出した酸素富化空気を、配管33から分岐した配管38を介して吸引し、さらに配管10、散気管8、散気孔9を介して被処理水6中に供給し曝気を行う。このとき三方調節弁39は配管38側からのみの通路を開としてある。   Next, a method for supplying oxygen-enriched air to the water to be treated 6 in the flow rate adjusting tank 5 will be described. When the dissolved oxygen concentration of the water 6 to be treated detected by the dissolved oxygen concentration detector 13 is lower than a predetermined value, the drive rotation speed of the blower 11 (suction means) is increased and the oxygen-enriched air discharged to the suction unit 34 Is sucked through a pipe 38 branched from the pipe 33 and further supplied into the treated water 6 through the pipe 10, the diffuser pipe 8, and the diffuser holes 9 to perform aeration. At this time, the three-way control valve 39 opens the passage only from the pipe 38 side.

また、溶存酸素濃度検出器13により検出した被処理水6の溶存酸素濃度が所定値に近似または高い場合には、ブロア11の駆動回転数を下げる。これによって酸素富化空気の配管38への吸引量を減少させ、被処理水6への過剰な曝気を防止する。さらにこの状況における運転においても被処理水6への過剰な曝気となる場合には、三方調節弁39を配管40側からのみの通路を開とし、大気中の空気のみをブロア11により吸引し被処理水6に供給する。さらに過剰な曝気となる場合にはブロア11の駆動を停止する。   In addition, when the dissolved oxygen concentration of the water to be treated 6 detected by the dissolved oxygen concentration detector 13 is close to or higher than a predetermined value, the drive rotation speed of the blower 11 is decreased. This reduces the amount of oxygen-enriched air sucked into the pipe 38 and prevents excessive aeration of the water 6 to be treated. Further, in the operation in this situation, when excessive aeration to the water to be treated 6 occurs, the three-way control valve 39 is opened only from the pipe 40 side, and only air in the atmosphere is sucked by the blower 11 to be covered. Supply to treated water 6. If excessive aeration occurs, the drive of the blower 11 is stopped.

以上のように、ブロア11の駆動回転数を制御することによって、被処理水6への酸素富化空気の供給量を調節し、前記被処理水の溶存酸素濃度を制御する。また被処理水6への酸素富化空気の供給量の調節は、配管38側からの酸素富化空気の吸引量と配管40側からの大気中の空気の吸引量の比率を、三方調節弁39の開度調節によって行うことができる。この場合には酸素富化空気と大気中の空気との混合気体のうち、三方調節弁39の開度調節によって酸素富化空気の吸引量を無段階に調節し、酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することによって、前記被処理水6の溶存酸素濃度を制御するものである。   As described above, the amount of oxygen-enriched air supplied to the water to be treated 6 is adjusted by controlling the drive speed of the blower 11 to control the dissolved oxygen concentration of the water to be treated. Further, the amount of oxygen-enriched air supplied to the water to be treated 6 is adjusted by adjusting the ratio between the amount of oxygen-enriched air sucked from the pipe 38 and the amount of air sucked in the air from the pipe 40 side by a three-way control valve. This can be done by adjusting the opening of 39. In this case, among the mixed gas of oxygen-enriched air and air in the atmosphere, the suction amount of oxygen-enriched air is adjusted steplessly by adjusting the opening of the three-way control valve 39, and the oxygen-enriched air and air The dissolved oxygen concentration of the to-be-treated water 6 is controlled by adjusting the mixing ratio of the air and supplying it to the to-be-treated water.

また、被処理水6へ供給する曝気用の酸素富化空気と大気中の空気との混合気体の量は、ブロア11の駆動回転数を制御することによって調節する。このように被処理水6への酸素富化空気の供給量を調節するとともに、曝気用の気体の総量を調節することを可能として、被処理水の溶存酸素濃度をよりきめ細かく制御することができる。さらに曝気用の気体の総量を調節することで流量調整槽5内の被処理水6の攪拌を促進して汚泥の沈降、凝集を防止することができる。   Further, the amount of the mixed gas of the oxygen-enriched air for aeration supplied to the water to be treated 6 and the air in the atmosphere is adjusted by controlling the drive rotation speed of the blower 11. In this way, the supply amount of oxygen-enriched air to the water to be treated 6 can be adjusted, and the total amount of aeration gas can be adjusted, so that the dissolved oxygen concentration of the water to be treated can be controlled more finely. . Furthermore, by adjusting the total amount of the gas for aeration, the agitation of the water to be treated 6 in the flow rate adjusting tank 5 can be promoted to prevent the sludge from settling and agglomerating.

ブロア11、23、ポンプ14、30、三方調節弁36、39、溶存酸素濃度検出器13、24の全体の制御は、制御器(図示なし)によって行うものである。またブロア11、23はこれに限定するものではなく、ポンプ、コンプレッサーを用いてもよい。   The whole control of the blowers 11 and 23, the pumps 14 and 30, the three-way control valves 36 and 39, and the dissolved oxygen concentration detectors 13 and 24 is performed by a controller (not shown). The blowers 11 and 23 are not limited to this, and a pump and a compressor may be used.

以上のように本発明の排水処理方法によれば、半導体製造設備に併設されている窒素製造装置1で副次的に生成される酸素富化空気を、前記半導体製造設備から排出される有機物を含む好気性処理槽16の被処理水17に供給することによって、専用の酸素富化空気供給源(例えば、酸素ガス供給設備)を不要とし、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化を図ることができる。さらに浄化処理時間の短縮、曝気用気体の送風量を抑えられることによるブロア23の小型化、消費電力の削減、騒音の抑制を図ることができる。さらに半導体製造設備において窒素製造装置1は常時連続して稼動しており、酸素富化空気も連続して得られ、さらに窒素製造装置1を深冷分離式とすることで、酸素富化空気を比較的大量に得られることにより、好気性処理槽16の被処理水17に安定して供給することができる。   As described above, according to the wastewater treatment method of the present invention, the oxygen-enriched air that is secondarily generated in the nitrogen production apparatus 1 provided in the semiconductor production facility is converted into the organic matter discharged from the semiconductor production facility. By supplying the water to be treated 17 of the aerobic treatment tank 16 including it, a dedicated oxygen-enriched air supply source (for example, oxygen gas supply facility) is not required, and the total system cost is reduced and energy is saved and saved. Space can be achieved. Furthermore, the purification process time can be shortened, the blower 23 can be reduced in size, the power consumption can be reduced, and the noise can be reduced by reducing the amount of aeration gas. Further, in the semiconductor manufacturing facility, the nitrogen production apparatus 1 is continuously operated, and oxygen-enriched air is also obtained continuously. Further, by making the nitrogen production apparatus 1 a cryogenic separation type, the oxygen-enriched air is obtained. By being obtained in a relatively large amount, it can be stably supplied to the water to be treated 17 of the aerobic treatment tank 16.

また、流量調整槽5内の被処理水6にも窒素製造装置1で得られた酸素富化空気を供給することによって、好気性処理槽16での曝気負荷の削減、迅速な目標溶存酸素濃度への制御を可能にして、より一層浄化処理時間の短縮を図ることができる。さらに流量調整槽5、好気性処理槽16内の被処理水6、17への曝気用気体の送風量を抑えられることによるブロア23の小型化、消費電力の削減、騒音の抑制を図ることができる。   Further, the oxygen-enriched air obtained by the nitrogen production apparatus 1 is also supplied to the water 6 to be treated in the flow rate adjustment tank 5, thereby reducing the aeration load in the aerobic treatment tank 16 and swift target dissolved oxygen concentration. Therefore, it is possible to further reduce the purification processing time. Further, the blower 23 can be reduced in size, power consumption can be reduced, and noise can be reduced by suppressing the amount of aeration gas blown into the water to be treated 6 and 17 in the flow rate adjustment tank 5 and the aerobic treatment tank 16. it can.

また、好気性処理槽16内の被処理水17または流量調整槽5内の被処理水6への酸素富化空気の供給量を調節することによって、前記被処理水の溶存酸素濃度を浄化処理に最適な値に制御することが可能となり処理時間の短縮を図ることができる。また酸素富化空気と大気中の空気の混合比率を調節することによって、被処理水6、17への酸素富化空気の供給量を調節するとともに、曝気用の気体の総量を調節することを可能として、被処理水6、17の溶存酸素濃度をよりきめ細かく制御することができる。さらに曝気用の気体の総量を調節することで流量調整槽5、好気性処理槽16内の被処理水6、17の攪拌を促進して汚泥の沈降、凝集を防止することができる。   Further, the dissolved oxygen concentration of the water to be treated is purified by adjusting the supply amount of oxygen-enriched air to the water to be treated 17 in the aerobic treatment tank 16 or the water to be treated 6 in the flow rate adjustment tank 5. Therefore, it is possible to control to an optimum value, and the processing time can be shortened. In addition, by adjusting the mixing ratio of oxygen-enriched air and air in the atmosphere, the amount of oxygen-enriched air supplied to the water to be treated 6 and 17 is adjusted, and the total amount of gas for aeration is adjusted. As possible, the dissolved oxygen concentration of the water 6 and 17 to be treated can be controlled more finely. Furthermore, by adjusting the total amount of gas for aeration, the stirring of the water to be treated 6 and 17 in the flow rate adjusting tank 5 and the aerobic processing tank 16 can be promoted to prevent the sedimentation and aggregation of sludge.

また、窒素製造装置1から大気開放状態において酸素富化空気を吸引手段であるブロア11またはブロア23により吸引して被処理水6、17に供給することによって、窒素製造装置1からの酸素富化空気の吐出に対して流路抵抗の増加、圧力変動をなくし、窒素製造装置1における高純度窒素ガスおよび酸素富化空気の生成を安定して行うことができる。   In addition, oxygen-enriched air from the nitrogen production apparatus 1 is sucked by the blower 11 or the blower 23 serving as a suction means and supplied to the water to be treated 6, 17 in an open air state. It is possible to eliminate the increase in flow resistance and pressure fluctuation with respect to the discharge of air, and stably generate high-purity nitrogen gas and oxygen-enriched air in the nitrogen production apparatus 1.

以上のように、本発明の排水処理方法、排水処理装置は、原料空気から分離して高純度窒素を製造する窒素製造装置を用いている施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とするものである。これによって半導体製造設備に備える窒素製造装置の副生成ガスである酸素富化空気を有効に利用し、トータルシステムとしての設備費の削減および省エネルギー化、省スペース化と、浄化処理時間の短縮を図ることができる。   As described above, the wastewater treatment method and wastewater treatment apparatus of the present invention include wastewater containing organic matter that is treated water discharged from a facility that uses a nitrogen production apparatus that produces high-purity nitrogen by separating from raw material air. In the purification process, the oxygen-enriched air generated by the nitrogen production apparatus is supplied to the treated water stored in the aerobic treatment tank and aerated, and the treated water is purified. It is characterized by this. This effectively uses oxygen-enriched air, which is a by-product gas of nitrogen production equipment in semiconductor manufacturing equipment, to reduce equipment costs, energy saving, space saving, and purification processing time as a total system. be able to.

排水の好気性処理を必要とする広範囲の装置の用途にも適用できる。   It can also be applied to a wide range of equipment that requires aerobic treatment of wastewater.

本発明の実施の形態1の排水処理装置の基本構成図Basic configuration diagram of waste water treatment apparatus of Embodiment 1 of the present invention 窒素製造装置の構成を示す系統図System diagram showing the configuration of the nitrogen production system

符号の説明Explanation of symbols

1 窒素製造装置
2、4、7、10、12、15、20、22、25、28、29、31、33、37、38、40、44、46、48、50、51、53 配管
3 ユースポイント
4a 吐出口
5 流量調整槽
6、17 被処理水
8、18 散気管
9、19 散気孔
11、23 ブロア
13、24 溶存酸素濃度検出器
14、30 ポンプ
16 好気性処理槽
21、32 開閉弁
26 沈殿槽
27 処理水
33a 吸引口
34 吸引部
35 開口
36、39 三方調節弁
41 フィルター
42 圧縮機
43 クーラー
45 吸着器
47 熱交換器
49 精留塔
52 減圧弁
1 Nitrogen production equipment 2, 4, 7, 10, 12, 15, 20, 22, 25, 28, 29, 31, 33, 37, 38, 40, 44, 46, 48, 50, 51, 53 Piping 3 Use Point 4a Discharge port 5 Flow rate adjustment tank 6, 17 Water to be treated 8, 18 Air diffuser 9, 19 Air diffuser 11, 23 Blower 13, 24 Dissolved oxygen concentration detector 14, 30 Pump 16 Aerobic treatment tank 21, 32 On-off valve 26 Precipitation tank 27 Treated water 33a Suction port 34 Suction part 35 Opening 36, 39 Three-way control valve 41 Filter 42 Compressor 43 Cooler 45 Adsorber 47 Heat exchanger 49 Rectification tower 52 Pressure reducing valve

Claims (12)

原料空気から分離して窒素ガスを製造する窒素製造装置を用いた施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とする排水処理方法。 In the purification treatment of wastewater containing organic matter, which is water to be treated and discharged from a facility using a nitrogen production apparatus that produces nitrogen gas separated from raw material air, oxygen enriched as a secondary product in the nitrogen production apparatus A wastewater treatment method characterized by supplying the aerated air to the treated water stored in the aerobic treatment tank, aerated, and purifying the treated water. 酸素富化空気を、好気性処理槽の上流側に位置する流量調整槽内の被処理水に供給して曝気することを特徴とする請求項1に記載の排水処理方法。 The wastewater treatment method according to claim 1, wherein oxygen-enriched air is supplied to the treated water in a flow rate adjusting tank located upstream of the aerobic treatment tank and aerated. 被処理水への酸素富化空気の供給量を調節することによって、前記被処理水の溶存酸素濃度を制御することを特徴とする請求項1または2に記載の排水処理方法。 The wastewater treatment method according to claim 1 or 2, wherein a dissolved oxygen concentration of the water to be treated is controlled by adjusting a supply amount of oxygen-enriched air to the water to be treated. 酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することを制御することを特徴とする請求項3に記載の排水処理方法。 The wastewater treatment method according to claim 3, wherein the supply ratio of the oxygen-enriched air and the air in the atmosphere is adjusted and supplied to the water to be treated. 窒素製造装置から大気開放状態において酸素富化空気を吸引手段により吸引して被処理水に供給することを特徴とする請求項1〜4のいずれか1項に記載の排水処理方法。 The wastewater treatment method according to any one of claims 1 to 4, wherein oxygen-enriched air is sucked by suction means from the nitrogen production apparatus and supplied to the water to be treated. 窒素製造装置は、深冷式窒素製造方法であることを特徴とする請求項1〜5のいずれか1項に記載の排水処理方法。 The wastewater treatment method according to any one of claims 1 to 5, wherein the nitrogen production apparatus is a deep-cooled nitrogen production method. 原料空気から分離して窒素ガスを製造する窒素製造装置を用いている施設から排出される被処理水である有機物を含む排水の浄化処理において、前記窒素製造装置で副次的に生成される酸素富化空気を、好気性処理槽内に貯留する被処理水に供給して曝気し、前記被処理水の浄化処理を行うことを特徴とする排水処理装置。 In the purification treatment of wastewater containing organic matter, which is the water to be treated, discharged from the facility using the nitrogen production apparatus that produces nitrogen gas separated from the raw air, oxygen generated by the nitrogen production apparatus is secondary A wastewater treatment apparatus characterized in that the enriched air is supplied to the treated water stored in the aerobic treatment tank and aerated to purify the treated water. 酸素富化空気を、好気性処理槽の上流側に位置する流量調整槽内の被処理水に供給して曝気することを特徴とする請求項7に記載の排水処理装置。 The wastewater treatment apparatus according to claim 7, wherein the oxygen-enriched air is supplied to the treated water in a flow rate adjusting tank located upstream of the aerobic treatment tank and aerated. 被処理水への酸素富化空気の供給量を調節することによって、前記被処理水の溶存酸素濃度を制御することを特徴とする請求項7または8に記載の排水処理装置。 The wastewater treatment apparatus according to claim 7 or 8, wherein a dissolved oxygen concentration of the water to be treated is controlled by adjusting a supply amount of oxygen-enriched air to the water to be treated. 酸素富化空気と大気中の空気の混合比率を調節して被処理水に供給することを制御することを特徴とする請求項9に記載の排水処理装置。 The waste water treatment apparatus according to claim 9, wherein the supply ratio of the oxygen-enriched air and the air in the atmosphere is adjusted and supplied to the water to be treated. 窒素製造装置から大気開放状態において酸素富化空気を吸引手段により吸引して被処理水に供給することを特徴とする請求項7〜10のいずれか1項に記載の排水処理装置。 The wastewater treatment apparatus according to any one of claims 7 to 10, wherein oxygen-enriched air is sucked by a suction means and supplied to the water to be treated from the nitrogen production apparatus in an open air state. 窒素製造装置は、深冷式窒素製造装置であることを特徴とする請求項7〜11のいずれか1項に記載の排水処理装置。 The wastewater treatment apparatus according to any one of claims 7 to 11, wherein the nitrogen production apparatus is a deep-cooled nitrogen production apparatus.
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