JP2001259678A - Method for reducing volume of generated sludge in waste water treating apparatus and waste water treating apparatus - Google Patents
Method for reducing volume of generated sludge in waste water treating apparatus and waste water treating apparatusInfo
- Publication number
- JP2001259678A JP2001259678A JP2000075242A JP2000075242A JP2001259678A JP 2001259678 A JP2001259678 A JP 2001259678A JP 2000075242 A JP2000075242 A JP 2000075242A JP 2000075242 A JP2000075242 A JP 2000075242A JP 2001259678 A JP2001259678 A JP 2001259678A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- wastewater
- ozone
- treatment tank
- aerobic biological
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機性排水を生物
学的に処理する排水処理装置から発生する有機性汚泥
（以下単に汚泥という。）を減容化する発生汚泥減容方
法及び排水処理装置に関する。The present invention relates to a method for reducing the volume of generated sludge for reducing the volume of organic sludge (hereinafter simply referred to as sludge) generated from a wastewater treatment apparatus for biologically treating organic wastewater, and a wastewater treatment. Related to the device.
【０００２】[0002]
【従来の技術】従来、下水、食品排水、厨房排水又は浄
化槽汚泥などの有機性排水の好気性生物処理方法として
は、活性汚泥処理法、固定床式接触酸化法又は流動床式
接触酸化法などの生物処理方法が用いられている。2. Description of the Related Art Conventionally, aerobic biological treatment methods for organic wastewater such as sewage, food wastewater, kitchen wastewater or septic tank sludge include activated sludge treatment, fixed-bed contact oxidation or fluidized-bed contact oxidation. Biological treatment method is used.
【０００３】活性汚泥法にあっては、好気性微生物であ
る活性汚泥の浮遊する処理槽内に排水を供給し、空気で
曝気することにより、活性汚泥の生物学的作用で原水中
の有機物を酸化分解処理する方法であり、また、固定床
式接触酸化法にあっては、処理槽内に生物担体の固定床
を設け、空気で曝気することにより微生物を担体の表面
に付着増殖させ、付着した微生物の生物学的作用で原水
中の有機物を酸化分解処理する方法であり、更に、流動
床式接触酸化法は、好気性生物処理槽内の液中に流動可
能に生物担体を充填し、原水を供給して空気で曝気する
ことにより、生物担体の表面に付着増殖した微生物の生
物学的作用で原水中の有機物を酸化分解処理する方法で
ある。In the activated sludge method, wastewater is supplied into a treatment tank in which activated sludge, which is an aerobic microorganism, floats, and is aerated with air to remove organic matter in raw water by the biological action of activated sludge. This is an oxidative decomposition treatment method.In the case of the fixed-bed catalytic oxidation method, a fixed bed of a biological carrier is provided in a treatment tank, and microorganisms are adhered and propagated on the surface of the carrier by aeration with air. Is a method of oxidatively decomposing organic matter in raw water by the biological action of microorganisms, and the fluidized-bed catalytic oxidation method is a method in which a liquid in an aerobic biological treatment tank is filled with a biological carrier in a flowable manner, This is a method in which raw water is supplied and aerated with air to oxidatively decompose organic substances in the raw water by the biological action of microorganisms attached and grown on the surface of the biological carrier.
【０００４】前記生物処理方法では、いずれも有機物を
生物学的に分解処理するのに伴い、増殖した微生物が汚
泥として大量に発生する。発生した汚泥は沈殿槽などで
分離濃縮され、その一部は生物処理工程に循環される
が、残部は余剰汚泥として適宜な方法で処分されてい
る。なお、その余剰汚泥量は生物処理工程に導入された
原水中の有機物量（ＢＯＤ）の３０〜４０％といわれて
いる。それら余剰汚泥の処分方法としては、汚泥を濃
縮、脱水したのち焼却や埋め立てにより処分したり、又
は嫌気性消化処理により減容化されている。[0004] In any of the above-mentioned biological treatment methods, a large amount of microorganisms proliferated as sludge is generated as organic substances are biologically decomposed. The generated sludge is separated and concentrated in a sedimentation tank and the like, and a part of the sludge is circulated to the biological treatment step, while the remainder is disposed of as excess sludge by an appropriate method. The excess sludge amount is said to be 30 to 40% of the amount of organic matter (BOD) in the raw water introduced into the biological treatment process. As a method of disposing of the excess sludge, the sludge is concentrated and dewatered and then disposed of by incineration or landfill, or the volume is reduced by anaerobic digestion.
【０００５】更に、発生汚泥をできるだけ減容化する方
法として、特許第２９７３７６１号公報には、汚泥を曝
気槽から抜き出してオゾン処理したのち、曝気槽に返送
する汚泥の減容化方法が開示されており、また、特開平
２−２２２７９８号公報には、下水余剰汚泥をオゾンで
酸化分解する汚泥の前処理方法が開示されている。Further, as a method of reducing the volume of generated sludge as much as possible, Japanese Patent No. 2973761 discloses a method of reducing the volume of sludge which is obtained by extracting sludge from an aeration tank, treating it with ozone, and then returning the sludge to the aeration tank. Further, Japanese Patent Application Laid-Open No. 2-279898 discloses a pretreatment method for sludge in which sewage excess sludge is oxidatively decomposed with ozone.
【０００６】[0006]
【発明が解決しようとする課題】前記従来の余剰汚泥の
処分方法で、汚泥を濃縮、脱水したのち焼却又は埋め立
て処分する方法にあっては、汚泥の濃縮、脱水後におい
ても含水率が７０〜８０ｗｔ％と高いため嵩が大きく、
廃棄物業者に処分を依頼する場合には、引き取りコスト
が高くなり、排水処理全体にかかるコストの多くを占め
ているのが現状である。更に、埋め立て処分において
は、産業廃棄物埋立処分場の残余年数が少なくなってお
り、引き取りコストも年々高騰している。また、焼却処
分においては、含水率が高いため燃料消費量が多く燃料
費が嵩み、更に、排出ガスや焼却灰の処理が必要であ
り、近年はダイオキシン問題等から焼却処理自体が困難
になってきている状況である。According to the conventional method for disposing of excess sludge, the sludge is concentrated and dewatered and then incinerated or landfilled. The bulk is large because it is as high as 80 wt%,
In the case of requesting disposal from a waste disposal company, the cost of picking up becomes high, and at present, it accounts for much of the cost of wastewater treatment as a whole. Furthermore, in the landfill disposal, the remaining years of the industrial waste landfill are decreasing, and the collection cost is increasing year by year. In addition, incineration disposal requires high fuel consumption due to high water content, increases fuel cost, and requires disposal of exhaust gas and incineration ash.In recent years, incineration itself has become difficult due to dioxin problems. It is a situation that is coming.
【０００７】また、嫌気性消化法により減容化処理する
方法にあっては、メタン菌等の嫌気性微生物が浮遊する
処理槽内に汚泥を供給し、嫌気性ガスで曝気することに
より、嫌気性微生物の生物学的作用で汚泥中の有機物を
メタンガスや炭酸ガス等に分解処理する方法であるが、
メタンガスを燃料等に有効活用できるため好ましいが、
処理に時間がかかり、消化槽等の設備が過大となり、ま
た、最終的に発生する汚泥量も多く、その処分には前記
の問題点が解決できない。In the method of reducing the volume by an anaerobic digestion method, sludge is supplied into a treatment tank in which anaerobic microorganisms such as methane bacteria are suspended, and the sludge is aerated with an anaerobic gas. It is a method of decomposing organic matter in sludge into methane gas or carbon dioxide gas by the biological action of sexual microorganisms.
It is preferable because methane gas can be effectively used for fuel etc.
The treatment takes time, the facilities such as digestion tanks become excessive, and the amount of sludge finally generated is large, and the above-mentioned problems cannot be solved by disposal thereof.
【０００８】更に、特許第２９７３７６１号公報及び特
開平２−２２２７９８号公報に開示された汚泥の処理方
法では、いずれも好気性生物処理槽とは別の汚泥処理槽
で汚泥を処理しているため、好気性生物処理槽には別に
曝気装置を設ける必要があり、オゾン含有ガス中の酸素
が有効に利用されていないため、設備費や運転経費が嵩
む問題があり、特に、汚泥減容化処理したのちの好気性
生物処理では、処理槽での負荷が高まるため、より酸素
が必要となり、更に運転経費が嵩む問題がある。Further, in the sludge treatment methods disclosed in Japanese Patent No. 2973761 and JP-A-2-222798, sludge is treated in a sludge treatment tank separate from the aerobic biological treatment tank. In the aerobic biological treatment tank, it is necessary to provide a separate aeration device, and the oxygen in the ozone-containing gas is not effectively used. In the subsequent aerobic biological treatment, the load on the treatment tank is increased, so that more oxygen is required, and there is a problem that the operating cost is further increased.
【０００９】本発明は、前記従来の汚泥処分及び減容化
処理における問題点に鑑みて成されたものであり、比較
的小型の設備を既存の水処理設備に設けるか又は新設水
処理設備に設けることにより、オゾン含有ガス中の酸素
が有効に利用され、効率の高い汚泥の減容化を図ること
ができ、運転コストや設備コストなどが低廉となり、最
終処分コストも低廉化できる汚泥減容化処理方法を提供
する目的で成されたものである。The present invention has been made in view of the problems in the conventional sludge disposal and volume reduction treatment described above, and a relatively small facility is provided in an existing water treatment facility or in a new water treatment facility. By using this method, the oxygen in the ozone-containing gas can be used effectively, and the volume of sludge can be reduced with high efficiency, the operating costs and equipment costs can be reduced, and the final disposal cost can be reduced. The purpose of the present invention is to provide a chemical treatment method.
【００１０】[0010]
【課題を解決するための手段】前記目的を達成するため
の本発明の要旨は、請求項１に記載した発明において
は、排水中の有機物を好気性生物処理する排水処理方法
において、好気性生物処理槽内の汚泥混合排水とオゾン
含有ガスをエジェクタで混合して好気性生物処理槽内の
汚泥混合排水中に吹込むことを特徴とする排水処理装置
の発生汚泥減容方法であり、また、請求項２に記載した
発明においては、請求項１記載の排水処理装置の発生汚
泥減容方法において、オゾン含有ガスが純酸素からオゾ
ン発生装置で生成されたオゾン含有ガスであることを特
徴とする排水処理装置の発生汚泥減容方法である。According to a first aspect of the present invention, there is provided a wastewater treatment method for aerobic biological treatment of organic matter in wastewater. A method for reducing the volume of generated sludge of a wastewater treatment device, characterized by mixing sludge mixed wastewater in a treatment tank and ozone-containing gas with an ejector and blowing the mixture into sludge mixed wastewater in an aerobic biological treatment tank, According to a second aspect of the present invention, in the method for reducing the volume of generated sludge of the wastewater treatment apparatus according to the first aspect, the ozone-containing gas is an ozone-containing gas generated from pure oxygen by an ozone generator. This is a method for reducing the volume of generated sludge in a wastewater treatment device.
【００１１】また、請求項３に記載した発明において
は、排水中の有機物を好気性生物処理する排水処理装置
において、密閉構造の好気性生物処理槽と、純酸素から
オゾン含有ガスを生成するオゾン発生装置と、前記好気
性生物処理槽内の汚泥混合排水を吸引する吸引ポンプ
と、該吸引ポンプで吸引された汚泥混合排水と前記オゾ
ン発生装置で生成されたオゾン含有ガスとを混合し、前
記好気性生物処理槽内の汚泥混合排水中に吹込むノズル
を接続したエジェクタとを設けたことを特徴とする排水
処理装置であり、また、請求項４に記載した発明におい
ては、請求項３記載の排水処理装置において、好気性生
物処理槽が活性汚泥処理槽であることを特徴とする装置
であり、更に、請求項５に記載した発明においては、請
求項３記載の排水処理装置において、好気性生物処理槽
が固液分離手段により汚泥が濃縮された汚泥混合排水を
好気性生物処理する汚泥再曝気槽であることを特徴とす
る装置である。According to a third aspect of the present invention, there is provided a wastewater treatment apparatus for aerobic biological treatment of organic matter in wastewater, wherein an aerobic biological treatment tank having a closed structure and ozone for generating an ozone-containing gas from pure oxygen. A generator, a suction pump for sucking sludge mixed wastewater in the aerobic biological treatment tank, and mixing the sludge mixed wastewater sucked by the suction pump and the ozone-containing gas generated by the ozone generator, The wastewater treatment apparatus is provided with an ejector connected to a nozzle that blows into the mixed sludge wastewater in the aerobic biological treatment tank, and the invention described in claim 4 is claim 3. The wastewater treatment apparatus according to claim 1, wherein the aerobic biological treatment tank is an activated sludge treatment tank, and further, in the invention according to claim 5, the wastewater treatment according to claim 3 In location, a device which is characterized in that the aerobic biological treatment tank is sludge reaeration tank sludge is aerobic biological treatment sludge mixed waste water was concentrated by a solid-liquid separation means.
【００１２】前記において、請求項１に記載した発明で
は、好気性生物処理槽内の汚泥混合排水とオゾン含有ガ
スをエジェクタで混合して好気性生物処理槽内の汚泥混
合排水中に吹込むことにより、汚泥を形成する微生物の
一部が死滅・分解して低分子有機物となり、生存する汚
泥により生物学的に消化される。特に、汚泥混合排水が
循環されることにより汚泥の死滅・分解及び消化が促進
され、汚泥全体としての発生量の減容化或いはゼロ化を
図ることができる。また、汚泥混合排水中に効率よくオ
ゾンや酸素を溶解することができると共に、オゾン含有
ガス中の酸素も好気性生物処理槽で必要な酸素として利
用されるため、別の曝気装置を必要としないか、または
最小限能力の装置でよく、装置の小型化を図ることがで
きる。更に、請求項２に記載した発明では、オゾン含有
ガスが純酸素からオゾン発生装置で生成されたオゾン含
有ガスとすることにより、オゾンが効率的に生成される
と共に、酸素のロスも生じないため、従来の酸素曝気法
の効率的処理もあわせて得ることができる。According to the first aspect of the present invention, the mixed sludge wastewater in the aerobic biological treatment tank and the ozone-containing gas are mixed by an ejector and are blown into the mixed sludge wastewater in the aerobic biological treatment tank. As a result, some of the microorganisms forming the sludge are killed and decomposed into low molecular weight organic substances, and are biologically digested by the living sludge. In particular, by circulating the sludge mixed wastewater, sludge death / decomposition and digestion are promoted, and the volume of sludge generated as a whole can be reduced or eliminated. In addition, ozone and oxygen can be efficiently dissolved in the sludge mixed wastewater, and oxygen in the ozone-containing gas is also used as necessary oxygen in the aerobic biological treatment tank, so that another aeration device is not required. Alternatively, a device having a minimum capacity may be used, and the size of the device can be reduced. Furthermore, in the invention described in claim 2, since the ozone-containing gas is an ozone-containing gas generated from pure oxygen by an ozone generator, ozone is efficiently generated and no loss of oxygen occurs. In addition, the efficient treatment of the conventional oxygen aeration method can also be obtained.
【００１３】また、請求項３に記載した発明では、汚泥
混合排水中に効率よくオゾンや酸素を溶解することがで
きるため、装置の小型化を図ることができ、また、汚泥
混合排水を循環することにより汚泥の死滅・分解及び消
化が促進され、汚泥全体としての発生量の減容化或いは
ゼロ化することができ、また、オゾンが効率的に生成さ
れると共に、酸素のロスも生じないため、従来の酸素曝
気法の効率的処理もあわせて得ることができる。更に、
請求項４に記載した発明では、活性汚泥処理槽の汚泥混
合排水中にオゾン含有ガスを吹込むことにより、活性汚
泥が効率的に生物学的消化され、汚泥全体としての発生
量を減容化或いはゼロ化することができる。また、請求
項５に記載した発明では、沈殿槽や膜分離濃縮槽等の固
液分離手段で分離濃縮された汚泥を好気性処理する汚泥
再曝気槽に、オゾン含有ガスを吹込むことにより、汚泥
が効率的に生物学的消化され、汚泥全体としての発生量
を減容化或いはゼロ化することができる。According to the third aspect of the present invention, ozone and oxygen can be efficiently dissolved in the mixed sludge wastewater, so that the apparatus can be downsized and the mixed sludge wastewater is circulated. As a result, sludge death, decomposition, and digestion are promoted, the volume of sludge generated can be reduced or reduced to zero, and ozone is efficiently generated and no oxygen loss occurs. In addition, the efficient treatment of the conventional oxygen aeration method can also be obtained. Furthermore,
According to the fourth aspect of the present invention, the activated sludge is efficiently biologically digested by injecting the ozone-containing gas into the mixed sludge wastewater of the activated sludge treatment tank, thereby reducing the amount of sludge generated as a whole. Alternatively, it can be made zero. Further, according to the invention described in claim 5, by injecting the ozone-containing gas into the sludge re-aeration tank for performing aerobic treatment of the sludge separated and concentrated by solid-liquid separation means such as a sedimentation tank and a membrane separation / concentration tank, Sludge is efficiently biologically digested, and the amount of sludge generated as a whole can be reduced or reduced to zero.
【００１４】なお、汚泥混合排水中に吹込むオゾン含有
ガス量は、５〜３０重量％（ｇ−Ｏ3／ｇ−減量汚泥Ｄ
Ｓ）が好ましい。また、エジェクタでの汚泥混合排水循
環ラインへのオゾン含有ガス吹込み量は、循環汚泥混合
排水容量当り１〜１０容量％が好ましく、その滞留時間
は１ｓｅｃ〜１ｍｉｎである。The amount of the ozone-containing gas blown into the mixed sludge wastewater is 5 to 30% by weight (g-O3 / g-reduced sludge D).
S) is preferred. Further, the amount of the ozone-containing gas blown into the sludge mixed wastewater circulation line in the ejector is preferably 1 to 10% by volume per the volume of the circulated sludge mixed wastewater, and the residence time is 1 sec to 1 min.
【００１５】[0015]
【発明の実施の形態】以下に本発明の実施の形態につい
て図面に基づいて説明する。図１は本発明の一実施の形
態である活性汚泥処理槽における系統図、図２は本発明
の他の実施の形態である活性汚泥処理槽における系統
図、図３は本発明の他の実施の形態である汚泥再曝気槽
における系統図である。なお、全図において同一作用を
有する部材については同一番号を付した。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram in an activated sludge treatment tank according to one embodiment of the present invention, FIG. 2 is a system diagram in an activated sludge treatment tank according to another embodiment of the present invention, and FIG. 3 is another embodiment of the present invention. It is a system diagram in the sludge re-aeration tank which is a form. In all the drawings, members having the same action are denoted by the same reference numerals.
【００１６】１は好気性微生物である活性汚泥が浮遊し
酸素含有ガスで曝気することにより、活性汚泥の生物学
的作用で原水中の有機物を酸化分解処理する好気性生物
処理槽であり、好気性生物処理槽１は、図１及び図２に
おいては、密閉構造の密閉活性汚泥処理槽１ａと解放さ
れた活性汚泥処理槽１ｂが隣設して一体的に設けられて
いる。また、好気性生物処理槽１は、処理槽内に生物担
体の固定床を設け、曝気することにより微生物を担体の
表面に付着増殖させ、付着した微生物の生物学的作用で
原水中の有機物を酸化分解処理する固定床式接触酸化処
理槽や処理槽内の液中に流動可能に生物担体を充填し、
原水を供給して曝気することにより、生物担体の表面に
付着増殖した微生物の生物学的作用で原水中の有機物を
酸化分解処理する流動床式接触酸化処理槽であってもよ
い。更に、排水中の窒素分を生物学的に硝化脱窒処理す
る硝化脱窒処理槽であってもよく、また、処理槽内に濾
過膜装置を配置し、汚泥を濾過して処理水を排出する構
成であってもよい。なお、図３においての好気性生物処
理槽１は、沈殿槽で沈降分離された汚泥を好気性処理す
る汚泥再曝気槽８であり、後段に活性汚泥処理槽１ｃが
連設されている。Reference numeral 1 denotes an aerobic biological treatment tank for oxidatively decomposing organic substances in raw water by the biological action of activated sludge by floating activated sludge, which is an aerobic microorganism, and aerating with an oxygen-containing gas. In FIG. 1 and FIG. 2, the gaseous biological treatment tank 1 is integrally provided with a closed activated sludge treatment tank 1a having a closed structure and an open activated sludge treatment tank 1b adjacent to each other. In the aerobic biological treatment tank 1, a fixed bed of a biological carrier is provided in the treatment tank, and microorganisms are adhered and proliferated on the surface of the carrier by aeration, and organic substances in raw water are removed by the biological action of the adhered microorganisms. A fixed bed type contact oxidation treatment tank for oxidative decomposition treatment and a biological carrier are filled into the liquid in the treatment tank in a flowable manner,
A fluidized bed contact oxidation treatment tank may be used in which raw water is supplied and aerated to oxidatively decompose organic matter in the raw water by the biological action of microorganisms attached and grown on the surface of the biological carrier. Furthermore, a nitrification and denitrification treatment tank for biologically nitrifying and denitrifying nitrogen in wastewater may be used.Furthermore, a filtration membrane device is disposed in the treatment tank to filter sludge and discharge treated water. The configuration may be as follows. The aerobic biological treatment tank 1 in FIG. 3 is a sludge re-aeration tank 8 for aerobically treating the sludge settled and separated in the sedimentation tank, and an activated sludge treatment tank 1c is provided at the subsequent stage.
【００１７】２は好気性生物処理槽１からの汚泥混合排
水中の汚泥を沈降分離して清澄な処理水を得る固液分離
手段の沈殿槽である。３は好気性生物処理槽１内の汚泥
混合排水を吸引する吸引ポンプであり、４は吸引ポンプ
で吸引された汚泥混合排水とオゾン含有ガスとを混合
し、好気性生物処理槽１内の汚泥混合排水中に吹込むノ
ズル５を接続したエジェクタである。なお、図２におい
ては、吸引ポンプ３が密閉活性汚泥処理槽１ａ内の汚泥
混合排水中に配置され、それに伴ってエジェクタ４など
も水中に配置された構成の装置である。Reference numeral 2 denotes a sedimentation tank of solid-liquid separation means for sedimenting and separating sludge in the mixed sludge wastewater from the aerobic biological treatment tank 1 to obtain clear treated water. Reference numeral 3 denotes a suction pump for sucking sludge mixed wastewater in the aerobic biological treatment tank 1. Reference numeral 4 denotes a mixture of the sludge mixed wastewater sucked by the suction pump and an ozone-containing gas, and sludge in the aerobic biological treatment tank 1. This is an ejector to which a nozzle 5 that blows into mixed wastewater is connected. In FIG. 2, the suction pump 3 is an apparatus having a configuration in which the sludge mixed drainage in the closed activated sludge treatment tank 1a is arranged, and the ejector 4 and the like are also arranged in water accordingly.
【００１８】また、６は純酸素を製造する酸素ＰＳＡ装
置、７は製造された純酸素からオゾン含有ガスを生成す
るオゾン発生装置である。なお、純酸素の製造は、前記
酸素ＰＳＡ装置ではなく、酸素分離膜装置等であっても
よく、また、酸素ボンベに充填された酸素を用いてもよ
い。また、オゾン含有ガスの生成は、純酸素を用いるの
が好ましいが、空気など酸素を含有するガスであれば用
いることができる。6 is an oxygen PSA device for producing pure oxygen, and 7 is an ozone generator for producing an ozone-containing gas from the produced pure oxygen. It should be noted that pure oxygen may be produced not by the oxygen PSA apparatus but by an oxygen separation membrane apparatus or the like, or may use oxygen filled in an oxygen cylinder. It is preferable to use pure oxygen for generating the ozone-containing gas, but any gas containing oxygen, such as air, can be used.
【００１９】前記構成の装置により有機性排水を処理す
る方法について以下詳述する。図１及び図２の装置にお
いて、有機性排水が原水供給管ａから密閉活性汚泥処理
槽１ａに供給され、また、密閉活性汚泥処理槽１ａには
沈殿槽２で沈降分離された汚泥が汚泥循環管ｆから循環
供給される。また、オゾン含有ガスは、酸素ＰＳＡ装置
６で製造された純酸素が純酸素供給管ｈからオゾン発生
装置７に供給され、該オゾン発生装置７でオゾン含有ガ
スが生成される。A method for treating organic wastewater by the above-described apparatus will be described in detail below. 1 and 2, organic wastewater is supplied from a raw water supply pipe a to a closed activated sludge treatment tank 1a, and sludge separated and settled in a sedimentation tank 2 in the closed activated sludge treatment tank 1a. It is circulated from the pipe f. As for the ozone-containing gas, pure oxygen produced by the oxygen PSA device 6 is supplied to the ozone generator 7 from the pure oxygen supply pipe h, and the ozone generator 7 generates the ozone-containing gas.
【００２０】密閉活性汚泥処理槽１ａ内の汚泥混合排水
を吸引ポンプ３で吸引してエジェクタに供給すると共
に、オゾン発生装置７で生成されたオゾン含有ガスがオ
ゾン含有ガス供給管ｂを経てエジェクタ４に供給され、
汚泥混合排水とオゾン含有ガスが混合されると共にオゾ
ン及び酸素が汚泥混合排水に溶解され、オゾン溶解排水
として循環管ｃから密閉活性汚泥処理槽１ａ内の汚泥混
合排水中に吹込まれる。この循環操作が継続されること
により、汚泥を形成する微生物の一部が死滅・分解して
低分子有機物となり、生存する汚泥により生物学的に消
化される。The sludge mixed wastewater in the closed activated sludge treatment tank 1a is sucked by the suction pump 3 and supplied to the ejector, and the ozone-containing gas generated by the ozone generator 7 is supplied to the ejector 4 via the ozone-containing gas supply pipe b. Supplied to
The mixed sludge wastewater and the ozone-containing gas are mixed together, and ozone and oxygen are dissolved in the mixed sludge wastewater. The ozone-dissolved wastewater is blown into the mixed sludge wastewater in the closed activated sludge treatment tank 1a from the circulation pipe c. By continuing this circulation operation, part of the microorganisms forming the sludge is killed and decomposed to low molecular organic matter, and is biologically digested by the living sludge.
【００２１】特に、汚泥混合排水が循環されることによ
り汚泥の死滅・分解及び消化が促進され、汚泥全体とし
ての発生量の減容化或いはゼロ化することができる。ま
た、汚泥混合排水中に効率よくオゾンや酸素を溶解する
ことができると共に、オゾン含有ガス中の酸素が好気性
生物処理槽１で必要な酸素として利用される。なお、汚
泥混合排水中に吹込むオゾン含有ガス量は、５〜３０重
量％（ｇ−Ｏ3／ｇ−減量汚泥ＤＳ）が好ましい。ま
た、エジェクタでの汚泥混合排水循環ラインへのオゾン
含有ガス吹込み量は、循環汚泥混合排水容量当り１〜１
０容量％が好ましく、その滞留時間は１ｓｅｃ〜１ｍｉ
ｎである。In particular, by circulating the sludge mixed wastewater, sludge death / decomposition and digestion are promoted, and the volume of sludge generated as a whole can be reduced or reduced to zero. In addition, ozone and oxygen can be efficiently dissolved in the sludge mixed wastewater, and oxygen in the ozone-containing gas is used as necessary oxygen in the aerobic biological treatment tank 1. The amount of the ozone-containing gas blown into the mixed sludge wastewater is preferably 5 to 30% by weight (g-O3 / g-reduced sludge DS). The amount of ozone-containing gas injected into the sludge mixed drainage circulation line in the ejector is 1 to 1 per circulated sludge mixed drainage capacity.
0% by volume is preferable, and the residence time is 1 sec to 1 mi.
n.
【００２２】密閉活性汚泥処理槽１ａで汚泥が減容化処
理された汚泥混合排水は、隣設された活性汚泥処理槽１
ｂに導入され、活性汚泥の生物学的作用で排水中の有機
物が酸化分解処理される。有機物が分解された汚泥混合
排水は、汚泥混合排水排出管ｄから沈殿槽２に供給さ
れ、汚泥が沈降分離される。汚泥が分離された上澄水は
処理水排出管ｅから系外に排出され、沈降した汚泥は、
汚泥循環管ｆから密閉活性汚泥処理槽１ａに循環され
る。なお、沈降濃縮された汚泥は、減容化処理されるた
め、全量を密閉活性汚泥処理槽１ａに循環することがで
きるが、排水の性状による汚泥量などによっては、一部
を余剰汚泥として系外に抜き出して、適宜な汚泥処理装
置で処理するようにしてもよい。The sludge mixed waste water whose sludge has been reduced in the closed activated sludge treatment tank 1a is supplied to the adjacent activated sludge treatment tank 1a.
b, and the organic matter in the wastewater is oxidatively decomposed by the biological action of the activated sludge. The sludge mixed wastewater in which the organic matter has been decomposed is supplied to the settling tank 2 from the sludge mixed wastewater discharge pipe d, and the sludge is settled and separated. The supernatant water from which the sludge has been separated is discharged out of the system from the treated water discharge pipe e, and the sludge that has settled is
It is circulated from the sludge circulation pipe f to the closed activated sludge treatment tank 1a. The sludge that has been settled and concentrated is subjected to volume reduction treatment, so that the entire amount can be circulated to the closed activated sludge treatment tank 1a. It may be taken out and treated with an appropriate sludge treatment device.
【００２３】図３の装置において、有機性排水は原水供
給管ａから活性汚泥処理槽１ｃに供給され、活性汚泥の
生物学的作用で排水中の有機物が酸化分解処理される。
有機物が分解された汚泥混合排水は、汚泥混合排水排出
管ｄから沈殿槽２に供給され、汚泥が沈降分離される。
汚泥が分離された上澄水は処理水排出管ｅから系外に排
出され、沈降した汚泥は、汚泥混合排水として汚泥循環
管ｆから好気性生物処理槽である汚泥再曝気槽８に循環
される。In the apparatus shown in FIG. 3, organic wastewater is supplied from a raw water supply pipe a to an activated sludge treatment tank 1c, and organic matter in the wastewater is oxidatively decomposed by the biological action of the activated sludge.
The sludge mixed wastewater in which the organic matter has been decomposed is supplied to the settling tank 2 from the sludge mixed wastewater discharge pipe d, and the sludge is settled and separated.
The supernatant water from which the sludge has been separated is discharged out of the system from a treated water discharge pipe e, and the settled sludge is circulated as sludge mixed wastewater from a sludge circulation pipe f to a sludge re-aeration tank 8 which is an aerobic biological treatment tank. .
【００２４】汚泥再曝気槽８に循環された汚泥混合排水
は、吸引ポンプ３で吸引してエジェクタに供給すると共
に、オゾン発生装置７で生成されたオゾン含有ガスがオ
ゾン含有ガス供給管ｂを経てエジェクタ４に供給され、
汚泥混合排水とオゾン含有ガスが混合されると共にオゾ
ン及び酸素が汚泥混合排水に溶解され、オゾン溶解排水
として循環管ｃから汚泥再曝気槽８内の汚泥混合排水中
に吹込まれ、図１の装置で説明した作用と同様に汚泥が
減容化処理され、後段の活性汚泥処理槽１ｃに供給され
る。この操作が継続されることにより、汚泥の減容化が
図られる。The sludge mixed wastewater circulated in the sludge re-aeration tank 8 is sucked by the suction pump 3 and supplied to the ejector, and the ozone-containing gas generated by the ozone generator 7 is passed through the ozone-containing gas supply pipe b. Supplied to the ejector 4,
The mixed wastewater and the ozone-containing gas are mixed together, and ozone and oxygen are dissolved in the mixed wastewater. The ozone-dissolved wastewater is blown from the circulation pipe c into the mixed wastewater in the sludge re-aeration tank 8, and the apparatus shown in FIG. The sludge is reduced in volume in the same manner as described in the above section, and supplied to the activated sludge treatment tank 1c at the subsequent stage. By continuing this operation, the volume of sludge is reduced.
【００２５】[0025]
【発明の効果】本発明は、比較的小型の設備を既存の水
処理設備に設けるか又は新設水処理設備に設けることに
より、オゾン含有ガス中の酸素が有効に利用され、効率
の高い汚泥の減容化を図ることができ、運転コストや設
備コストなどが低廉となり、最終処分コストも低廉化で
きる汚泥減容化処理方法である。According to the present invention, the oxygen in the ozone-containing gas is effectively used by providing a relatively small facility in an existing water treatment facility or in a new water treatment facility, thereby enabling efficient sludge removal. This is a sludge volume reduction treatment method capable of reducing the volume, lowering operating costs and equipment costs, and reducing final disposal costs.
【００２６】請求項１に記載の発明においては、汚泥混
合排水が循環されることにより汚泥の消化が促進され、
汚泥全体としての発生量の減容化或いはゼロ化すること
ができる。また、汚泥混合排水中に効率よくオゾンや酸
素を溶解することができると共に、オゾン含有ガス中の
酸素も好気性生物処理槽で必要な酸素として利用される
ため、別の曝気装置を必要としないか、又は、最小限能
力の装置で足りるため、装置の小型化を図ることができ
る。According to the first aspect of the present invention, the digestion of sludge is promoted by circulating the sludge mixed wastewater,
The volume of sludge generated as a whole can be reduced or reduced to zero. In addition, ozone and oxygen can be efficiently dissolved in the sludge mixed wastewater, and oxygen in the ozone-containing gas is also used as necessary oxygen in the aerobic biological treatment tank, so that another aeration device is not required. Alternatively, since a device having a minimum capacity is sufficient, the size of the device can be reduced.
【００２７】請求項２に記載した発明では、オゾンが効
率的に生成されると共に、酸素のロスも生じないため、
従来の酸素曝気法の効率的処理もあわせて得ることがで
き、請求項３、請求項４及び請求項５に記載した発明で
は、汚泥混合排水中に効率よくオゾンや酸素を溶解する
ことができるため、装置の小型化を図ることができ、ま
た、汚泥混合排水を循環することにより汚泥の消化が促
進され、汚泥全体としての発生量の減容化或いはゼロ化
することができ、更に、オゾンが効率的に生成されると
共に、酸素のロスも生じないため、従来の酸素曝気法の
効率的処理もあわせて得ることができる。According to the second aspect of the present invention, ozone is efficiently generated and no loss of oxygen occurs.
Efficient treatment of the conventional oxygen aeration method can also be obtained, and according to the invention described in claims 3, 4 and 5, ozone and oxygen can be efficiently dissolved in the sludge mixed wastewater. Therefore, the size of the apparatus can be reduced, and the sludge digestion can be promoted by circulating the sludge mixed wastewater, and the amount of sludge generated as a whole can be reduced or reduced to zero. Is efficiently produced and no oxygen loss occurs, so that the efficient treatment of the conventional oxygen aeration method can also be obtained.
【図１】本発明の一実施の形態である活性汚泥処理槽に
おける系統図FIG. 1 is a system diagram of an activated sludge treatment tank according to an embodiment of the present invention.
【図２】本発明の他の実施の形態である活性汚泥処理槽
における系統図FIG. 2 is a system diagram of an activated sludge treatment tank according to another embodiment of the present invention.
【図３】本発明の他の実施の形態である汚泥再曝気槽に
おける系統図FIG. 3 is a system diagram of a sludge re-aeration tank according to another embodiment of the present invention.
１：好気性生物処理槽 ２：沈殿槽 ３：吸引ポンプ ４：エジェクタ ５：ノズル ６：酸素ＰＳＡ装置 ７：オゾン発生装置 ８：汚泥再曝気槽 1: Aerobic biological treatment tank 2: Sedimentation tank 3: Suction pump 4: Ejector 5: Nozzle 6: Oxygen PSA device 7: Ozone generator 8: Sludge re-aeration tank
Claims (5)
処理方法において、好気性生物処理槽内の汚泥混合排水
とオゾン含有ガスをエジェクタで混合して好気性生物処
理槽内の汚泥混合排水中に吹込むことを特徴とする排水
処理装置の発生汚泥減容方法。1. A wastewater treatment method for aerobic biological treatment of organic matter in wastewater, wherein a mixed sludge wastewater in an aerobic biological treatment tank and an ozone-containing gas are mixed by an ejector to mix sludge wastewater in an aerobic biological treatment tank. A method for reducing the volume of generated sludge of a wastewater treatment device, characterized by blowing air into the inside.
置で生成されたオゾン含有ガスであることを特徴とする
請求項１記載の排水処理装置の発生汚泥減容方法。2. The method according to claim 1, wherein the ozone-containing gas is an ozone-containing gas generated from pure oxygen by an ozone generator.
処理装置において、密閉構造の好気性生物処理槽と、純
酸素からオゾン含有ガスを生成するオゾン発生装置と、
前記好気性生物処理槽内の汚泥混合排水を吸引する吸引
ポンプと、該吸引ポンプで吸引された汚泥混合排水と前
記オゾン発生装置で生成されたオゾン含有ガスとを混合
し、前記好気性生物処理槽内の汚泥混合排水中に吹込む
ノズルを接続したエジェクタとを設けたことを特徴とす
る排水処理装置。3. A wastewater treatment device for aerobic biological treatment of organic matter in wastewater, comprising: an aerobic biological treatment tank having a closed structure; an ozone generator for producing an ozone-containing gas from pure oxygen;
A suction pump for sucking sludge mixed wastewater in the aerobic biological treatment tank; mixing the sludge mixed wastewater sucked by the suction pump with the ozone-containing gas generated by the ozone generator; A wastewater treatment apparatus, comprising: an ejector connected to a nozzle that blows into the mixed sludge wastewater in the tank.
ことを特徴とする請求項３記載の排水処理装置。4. The wastewater treatment apparatus according to claim 3, wherein the aerobic biological treatment tank is an activated sludge treatment tank.
泥が濃縮された汚泥混合排水を好気性生物処理する汚泥
再曝気槽であることを特徴とする請求項３記載の排水処
理装置。5. The wastewater treatment apparatus according to claim 3, wherein the aerobic biological treatment tank is a sludge re-aeration tank for performing aerobic biological treatment on sludge mixed wastewater in which sludge is concentrated by solid-liquid separation means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000075242A JP2001259678A (en) | 2000-03-17 | 2000-03-17 | Method for reducing volume of generated sludge in waste water treating apparatus and waste water treating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000075242A JP2001259678A (en) | 2000-03-17 | 2000-03-17 | Method for reducing volume of generated sludge in waste water treating apparatus and waste water treating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001259678A true JP2001259678A (en) | 2001-09-25 |
Family
ID=18593159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000075242A Pending JP2001259678A (en) | 2000-03-17 | 2000-03-17 | Method for reducing volume of generated sludge in waste water treating apparatus and waste water treating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001259678A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009028481A1 (en) | 2007-08-28 | 2009-03-05 | Diamond Engineering Co., Ltd. | Activated sludge material, reduction method of excess sludge amount in bioreactor, and maintenance method of bioreactor |
| JP2016120470A (en) * | 2014-12-25 | 2016-07-07 | アサヒ飲料株式会社 | Activated sludge waste water treatment method and facility |
-
2000
- 2000-03-17 JP JP2000075242A patent/JP2001259678A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009028481A1 (en) | 2007-08-28 | 2009-03-05 | Diamond Engineering Co., Ltd. | Activated sludge material, reduction method of excess sludge amount in bioreactor, and maintenance method of bioreactor |
| US8603339B2 (en) | 2007-08-28 | 2013-12-10 | Diamond Engineering Co., Ltd. | Activated sludge material, method for reducing excess sludge production in bioreactor, and method of controlling bioreactor |
| JP2016120470A (en) * | 2014-12-25 | 2016-07-07 | アサヒ飲料株式会社 | Activated sludge waste water treatment method and facility |
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