JP2003062591A - Method for purifying organic waste water - Google Patents
Method for purifying organic waste waterInfo
- Publication number
- JP2003062591A JP2003062591A JP2001256247A JP2001256247A JP2003062591A JP 2003062591 A JP2003062591 A JP 2003062591A JP 2001256247 A JP2001256247 A JP 2001256247A JP 2001256247 A JP2001256247 A JP 2001256247A JP 2003062591 A JP2003062591 A JP 2003062591A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- biological
- iron
- acid
- 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)
- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、抄紙排水、各種工
場排水、下水などの懸濁粒子を含有する排水のダイナミ
ックろ過技術に関し、非常にコンパクトな設備によって
ＳＳを高度に除去でき、かつダイナミックろ過のフラッ
クスを大きくでき、ダイナミックろ過水のＳＳも低くで
きる技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic filtration technology for papermaking wastewater, various factory wastewater, wastewater containing suspended particles such as sewage. The technology relates to the technology that can increase the flux of water and lower the SS of the dynamic filtered water.
【０００２】[0002]
【従来の技術】活性汚泥の固液分離技術として、ダイナ
ミックろ過技術が知られている。ダイナミックろ過技術
は不織布、金網などの、孔径５０〜２００ミクロン程度
の目の粗い透水性の高いろ過支持材を用い、その表面に
活性汚泥層（これを「ダイナミックろ過膜」又は「ダイ
ナミック膜」と呼ぶ）を形成させ、低いろ過圧でろ過水
を得る技術である。2. Description of the Related Art A dynamic filtration technology is known as a solid-liquid separation technology for activated sludge. The dynamic filtration technology uses a non-woven fabric, wire mesh, or other filter support material with a pore size of about 50 to 200 microns and high permeability, and an activated sludge layer (this is referred to as "dynamic filtration membrane" or "dynamic membrane"). Is called) to obtain filtered water at a low filtration pressure.
【０００３】[0003]
【発明が解決しようとする課題】しかし、ＢＯＤ負荷条
件の変動につれて、活性汚泥粒子が分散状態になり、Ｓ
ＶＩが１００〜２００程度と小さくなり、（ＣＳＴ／Ｓ
Ｓ）比（秒・リットル／ｇ）が１５〜２０と大きくなる
と、ダイナミックろ過のフラックスが低下し、ダイナミ
ックろ過水のＳＳが悪化する欠点があった。However, as the BOD load condition changes, the activated sludge particles become dispersed and S
VI becomes as small as about 100 to 200, and (CST / S
When the S) ratio (second · liter / g) is as large as 15 to 20, the flux of the dynamic filtration is lowered, and the SS of the dynamic filtered water is deteriorated.
【０００４】本発明は、従来のダイナミックろ過技術の
欠点を解決した新技術を確立し、安定してダイナミック
ろ過のフラックスを大きく採ることができ、かつ安定し
てダイナミックろ過水のＳＳを低くでき、汚泥発生量が
減少できる新技術を提供することを課題とする。The present invention has established a new technology that solves the drawbacks of the conventional dynamic filtration technology, can stably take a large flux of dynamic filtration, and can stably lower the SS of the dynamic filtration water. It is an object to provide a new technology that can reduce the amount of sludge generation.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上記の課
題を解決すべく鋭意研究を行い、生物処理槽とダイナミ
ック膜ろ過槽からなる有機性排水の浄化処理装置におい
て、生物処理槽から汚泥を引き抜くか、ダイナミック膜
ろ過槽で分離された汚泥を酸処理するか、さらに酸処理
分離液をリン回収装置でリン除去材でリンを回収後、及
び酸処理分離汚泥を物理化学可溶化手段で可溶化後、生
物処理槽へ返送すれば、ダイナミックろ過膜の透水性が
安定して、無機凝集剤の使用量が減少し、ＳＳの少ない
透過水が得られ、活性汚泥の酸加水分解による生分解性
の向上により、余剰汚泥発生量が減少することを知見し
た。[Means for Solving the Problems] The present inventors have conducted diligent research to solve the above-mentioned problems, and in an organic waste water purification treatment apparatus comprising a biological treatment tank and a dynamic membrane filtration tank, After sludge is drawn out, the sludge separated in the dynamic membrane filtration tank is treated with acid, or the acid-treated separation liquid is recovered by phosphorus with a phosphorus removing device, and the acid-treated separation sludge is physically and chemically solubilized. After solubilizing with, after returning to the biological treatment tank, the water permeability of the dynamic filtration membrane will be stable, the amount of inorganic coagulant used will be reduced, and the permeated water with less SS will be obtained. It was found that the amount of surplus sludge generated is reduced by improving the biodegradability.
【０００６】本発明は、このような知見に基づいてなさ
れたものであり、次の構成からなるものである。
（１）生物処理工程において、有機性排水を鉄又はアル
ミニウム水酸化物フロックと生物汚泥が共存した状態で
生物処理し、前記共存汚泥をダイナミックろ過膜によっ
て固液分離してろ過水を取り出すとともに、固液分離し
た汚泥又は該生物処理工程の汚泥の一部を引き抜き、酸
を添加して金属水酸化物及び生物汚泥の菌体外ポリマを
溶出させて、鉄又はアルミニウムの金属イオン含有スラ
リを生成せしめ、前記鉄又はアルミニウムの金属イオン
含有酸処理スラリを、前記生物処理工程に返送すること
を特徴とする有機性排水の浄化方法。
（２）生物処理工程において、リン含有有機性排水を鉄
又はアルミニウム水酸化物フロックと生物汚泥が共存し
た状態で生物処理し、前記共存汚泥をダイナミックろ過
膜によって固液分離してろ過水を取り出すとともに、固
液分離した汚泥又は該生物処理工程の汚泥の一部を引き
抜き、酸を添加して金属水酸化物及び生物汚泥の菌体外
ポリマを溶出させて、鉄又はアルミニウムの金属イオン
含有スラリを生成せしめ、前記鉄又はアルミニウムの金
属イオン含有酸処理スラリを固液分離し、分離液からリ
ンを化学的に除去し、リンを除去した前記鉄又はアルミ
ニウムの金属イオン含有酸性液及び前記固液分離よりの
分離汚泥を、前記生物処理工程に返送することを特徴と
する有機性排水の浄化方法。
（３）前記鉄又はアルミニウムの金属イオン含有酸処理
スラリを固液分離した際の分離汚泥を物理化学的可溶化
し、可溶化汚泥を生物処理工程に返送することを特徴と
する前記（２）記載の有機性排水の浄化方法。The present invention has been made on the basis of such knowledge and has the following constitution. (1) In the biological treatment process, organic wastewater is biologically treated in the state where iron or aluminum hydroxide flocs and biological sludge coexist, and the coexisting sludge is subjected to solid-liquid separation by a dynamic filtration membrane to take out filtered water, Extraction of solid-liquid separated sludge or a part of the sludge of the biological treatment process, addition of acid to elute metal hydroxide and extracellular polymer of biological sludge to produce metal ion-containing slurry of iron or aluminum. The method for purifying organic wastewater, which comprises returning the iron- or aluminum-metal ion-containing acid-treated slurry to the biological treatment step. (2) In the biological treatment step, phosphorus-containing organic wastewater is biologically treated in a state where iron or aluminum hydroxide flocs and biological sludge coexist, and the coexisting sludge is subjected to solid-liquid separation by a dynamic filtration membrane to take out filtered water. At the same time, the solid-liquid separated sludge or a part of the sludge of the biological treatment process is extracted, and an acid is added to elute the metal hydroxide and the extracellular polymer of the biological sludge, and the slurry containing iron or aluminum metal ions is extracted. Is generated, solid-liquid separation of the iron or aluminum metal ion-containing acid-treated slurry, phosphorus is chemically removed from the separated liquid, and the iron or aluminum metal ion-containing acidic liquid and the solid liquid from which phosphorus has been removed. A method for purifying organic wastewater, comprising returning the separated sludge from the separation to the biological treatment step. (3) The separated sludge obtained by solid-liquid separation of the iron- or aluminum-metal ion-containing acid-treated slurry is physicochemically solubilized, and the solubilized sludge is returned to the biological treatment step (2). The method for purifying the described organic wastewater.
【０００７】（４）有機性排水を嫌気好気法による生物
学的硝化脱窒素法により浄化する装置において、有機性
排水を導入し、ダイナミック膜ろ過槽からの硝化液を循
環し、鉄又はアルミニウム水酸化物フロックと生物汚泥
の共存下に処理する硝化槽と脱窒素槽からなる生物処理
槽、前記生物処理槽からの汚泥混合液を処理水と汚泥ス
ラリに固液分離するダイナミック膜ろ過槽、前記前記生
物処理槽からの発生汚泥の一部を引き抜いたスラリに酸
を添加して金属水酸化物を溶解する酸処理装置、及び該
酸処理スラリを生物処理槽（硝化槽）へ返送する配管を
有することを特徴とする有機性排水の浄化装置。(4) In a device for purifying organic wastewater by a biological nitrification / denitrification method by an anaerobic / aerobic method, the organic wastewater is introduced to circulate the nitrification solution from a dynamic membrane filtration tank to produce iron or aluminum. A biological treatment tank consisting of a nitrification tank and a denitrification tank which are treated in the coexistence of hydroxide flocs and biological sludge, a dynamic membrane filtration tank for solid-liquid separation of a sludge mixture from the biological treatment tank into treated water and sludge slurry, An acid treatment device that dissolves metal hydroxide by adding an acid to a slurry obtained by extracting a part of sludge generated from the biological treatment tank, and a pipe for returning the acid treated slurry to the biological treatment tank (nitrification tank) A device for purifying organic wastewater, comprising:
【０００８】（５）有機性排水を嫌気好気法による生物
学的脱リン脱窒素により浄化する装置において、有機性
排水を導入し、ダイナミック膜ろ過槽からの硝化液を循
環し、鉄又はアルミニウム水酸化物フロックと生物汚泥
の共存下に処理する硝化槽と脱窒素槽からなる生物処理
槽、前記生物処理槽からの汚泥混合液を処理水と汚泥ス
ラリに固液分離するダイナミック膜ろ過槽、前記前記生
物処理槽からの発生汚泥の一部を引き抜いたスラリに酸
を添加して金属水酸化物を溶解する酸処理装置、該酸処
理スラリを分離液と酸処理汚泥に固液分離する沈殿槽、
前記酸化処理活性汚泥を可溶化し可溶化汚泥を脱窒素槽
へ返送する配管を接続した汚泥可溶化処理装置、前記分
離液からリン除去剤でリンを回収し、リンが除去された
金属イオン含有酸性液を脱窒素槽へ返送する配管を接続
したリン回収装置、及び前記硝化槽から脱窒素槽への循
環硝化液の循環・返送配管を有することを特徴とする有
機性排水の浄化装置。(5) In a device for purifying organic wastewater by biological dephosphorization and denitrification by an anaerobic / aerobic method, the organic wastewater is introduced and the nitrification solution from the dynamic membrane filtration tank is circulated to produce iron or aluminum. A biological treatment tank consisting of a nitrification tank and a denitrification tank which are treated in the coexistence of hydroxide flocs and biological sludge, a dynamic membrane filtration tank for solid-liquid separation of a sludge mixture from the biological treatment tank into treated water and sludge slurry, An acid treatment device that dissolves metal hydroxide by adding an acid to a slurry obtained by extracting a part of the sludge generated from the biological treatment tank, and a precipitate that solid-liquid separates the acid treatment slurry into a separation liquid and an acid treatment sludge. Tank,
A sludge solubilization treatment device connected to a pipe for solubilizing the oxidation-treated activated sludge and returning the solubilized sludge to the denitrification tank, phosphorus is recovered from the separated liquid with a phosphorus removing agent, and the phosphorus-removed metal ion is contained. An apparatus for purifying organic wastewater, comprising a phosphorus recovery device connected to a pipe for returning an acidic liquid to a denitrification tank, and a circulation / return pipe for circulating nitrification liquid from the nitrification tank to the denitrification tank.
【０００９】[0009]
【発明の実施の形態】本発明の実施の形態を図面に基づ
いて説明する。なお、実施の形態を説明するための全図
において、同一機能を有する構成要素は同一符号を付け
て説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. In all the drawings for explaining the embodiments, constituent elements having the same function are designated by the same reference numerals.
【００１０】図１に本発明の排水処理装置の一構成例の
ブロック図を示す。なお、有機性排水を以下「原水」と
もいう。図１において、活性汚泥スラリが懸濁流動しつ
つある生物学的硝化脱窒素処理を行う生物処理槽２内
に、水酸化アルミニウム又は水酸化鉄フロックを、１０
００〜２０００ｍｇ／リットル程度の濃度で懸濁流動さ
せる。このような状態の生物処理槽２に原水１を供給
し、硝化菌、脱窒素菌、ＢＯＤ資化菌によって生物学的
硝化脱窒素を行う。原水１中のリンは水酸化アルミニウ
ム又は水酸化鉄フロックに吸着して除去される。なお、
生物処理槽２は、脱窒素槽２ａと硝化槽２ｂから構成さ
れている。FIG. 1 is a block diagram showing an example of the construction of the wastewater treatment equipment of the present invention. The organic wastewater is also referred to as “raw water” below. In FIG. 1, aluminum hydroxide or iron hydroxide flocs are placed in a biological treatment tank 2 for biological nitrification and denitrification treatment in which activated sludge slurry is flowing in suspension.
Suspension flow is performed at a concentration of about 00 to 2000 mg / liter. Raw water 1 is supplied to the biological treatment tank 2 in such a state, and biological nitrification denitrification is performed by nitrifying bacteria, denitrifying bacteria, and BOD-assimilating bacteria. Phosphorus in the raw water 1 is adsorbed and removed by aluminum hydroxide or iron hydroxide floc. In addition,
The biological treatment tank 2 is composed of a denitrification tank 2a and a nitrification tank 2b.
【００１１】次に、生物処理水４を目の粗いろ布、金網
などの表面に、活性汚泥と水酸化アルミニウム（又は水
酸化鉄）フロック混合スラリによるダイナミックろ過膜
を形成させた固液分離モジュールを有するろ過槽５でろ
過し、ＳＳ、リン、窒素、ＢＯＤが高度に除去されたろ
過水（高度処理水）６が得られる。Next, a solid-liquid separation module in which the biologically treated water 4 is formed on a surface of a coarse filter cloth, a wire mesh or the like with a dynamic filtration membrane formed by a mixed slurry of activated sludge and aluminum hydroxide (or iron hydroxide) flocs. The filtered water (highly treated water) 6 in which SS, phosphorus, nitrogen, and BOD are highly removed is obtained by filtering in a filtration tank 5 having
【００１２】水酸化アルミニウム又は水酸化鉄フロック
を活性汚泥に共存させるには、原水１又は生物処理槽２
内に、硫酸バンド、ＰＡＣ、塩化第２鉄、硫酸鉄などの
無機凝集剤を、運転開始から所定期間添加して、加水分
解させ、水酸化アルミニウム、水酸化鉄フロックを所定
濃度になるまで添加したのち、無機凝集剤の添加を止め
ればよい。別の方法としては、前記無機凝集剤液に、水
酸化ナトリウム、消石灰などのアルカリを添加して中和
し、水酸化アルミニウム、水酸化鉄フロックスラリを製
造し、これを生物処理槽２に所定量添加しても良い。To make aluminum hydroxide or iron hydroxide floc coexist in activated sludge, raw water 1 or biological treatment tank 2 is used.
Inorganic flocculants such as sulfuric acid band, PAC, ferric chloride, and iron sulfate are added to the inside for a predetermined period from the start of operation to hydrolyze, and aluminum hydroxide and iron hydroxide flocs are added until a predetermined concentration is reached. After that, the addition of the inorganic coagulant may be stopped. As another method, an alkali such as sodium hydroxide or slaked lime is added to the inorganic coagulant solution to neutralize it to produce aluminum hydroxide or iron hydroxide flocs slurry, which is placed in the biological treatment tank 2. It may be added in a fixed amount.
【００１３】本発明で重要に点は、結晶性の水酸化アル
ミニウム、水酸化鉄を添加しても、ダイナミックろ過膜
のフラックスを向上できない点であり、バルキーでＳＶ
Ｉ値が大きく、フロック状の水酸化アルミニウム、水酸
化鉄を活性汚泥と共存させることがポイントである。し
かし、この状態で運転を続けると、水酸化鉄、水酸化ア
ルミニウムの熟成が進み、フロック構造が変化し、緻密
化するため、ダイナミックろ過膜のフラックスが徐々に
低下してしまう。この現象を防止するために、鋭意検討
した結果、次のような技術手段が効果的であることを見
出した。An important point in the present invention is that even if crystalline aluminum hydroxide or iron hydroxide is added, the flux of the dynamic filtration membrane cannot be improved.
The point is to make floc-like aluminum hydroxide and iron hydroxide having a large I value coexist with activated sludge. However, if the operation is continued in this state, the aging of iron hydroxide and aluminum hydroxide proceeds, the floc structure changes, and the densification changes, so that the flux of the dynamic filtration membrane gradually decreases. As a result of intensive studies to prevent this phenomenon, the following technical means have been found to be effective.
【００１４】すなわち生物処理槽２からスラリの一部８
を引き抜き、硫酸、塩酸、硝酸などの鉱酸９を添加し
て、活性汚泥と水酸化アルミニウム（又は水酸化鉄）の
共存スラリ中の金属水酸化物が溶解するｐＨ以下に低下
させる（酸処理装置１０）。水酸化アルミニウムを溶解
させるにはｐＨ４以下、水酸化鉄を溶解させるにはｐＨ
２以下に低下させる。この結果アルミニウムイオン、又
は鉄イオンが生成する。このような状態の酸処理スラリ
１１を生物処理槽２に返送すると、アルミニウムイオ
ン、又は鉄イオンが生物処理槽２の活性汚泥を凝集さ
せ、自身はアルミニウム又は鉄水酸化物に変わる。That is, a part 8 of the slurry from the biological treatment tank 2
And add mineral acid 9 such as sulfuric acid, hydrochloric acid or nitric acid to lower the pH below the level at which the metal hydroxide in the co-slurry of activated sludge and aluminum hydroxide (or iron hydroxide) dissolves (acid treatment Device 10). PH 4 or less to dissolve aluminum hydroxide, pH to dissolve iron hydroxide
Lower to 2 or less. As a result, aluminum ions or iron ions are generated. When the acid-treated slurry 11 in such a state is returned to the biological treatment tank 2, aluminum ions or iron ions aggregate the activated sludge in the biological treatment tank 2, and the aluminum itself or iron hydroxide is changed to aluminum or iron hydroxide.
【００１５】酸処理の過程で金属水酸化物が溶解するだ
けでなく、活性汚泥が酸によって加水分解され、可溶化
し生分解性が向上する。また活性汚泥の細胞表面に存在
する、菌体外ポリマが酸によって液側に溶出する。溶出
した菌体外ポリマは、有機高分子凝集剤と同様な凝集作
用を示す。このため、酸処理スラリを生物処理槽２に戻
すと、可溶化汚泥が生物分解を受けて、余剰汚泥１３の
発生量が減少し、前記のＡｌイオンの凝集作用と、高分
子凝集剤によるフロッキュレーション効果が発揮され、
活性汚泥が良好に凝集し、ダイナミックろ過膜を形成さ
せた場合に、非常に透水性がよいダイナミックろ過膜が
形成されることが認められた。Not only the metal hydroxide is dissolved in the process of acid treatment, but also the activated sludge is hydrolyzed and solubilized by the acid to improve the biodegradability. Further, the extracellular polymer existing on the cell surface of the activated sludge is eluted to the liquid side by the acid. The eluted extracellular polymer exhibits the same aggregating action as the organic polymer aggregating agent. Therefore, when the acid-treated slurry is returned to the biological treatment tank 2, the solubilized sludge undergoes biodegradation and the amount of excess sludge 13 generated is reduced, and the flocculation action of the Al ions and the polymer flocculant is reduced. Curation effect is demonstrated,
It was found that when the activated sludge was well aggregated and formed a dynamic filtration membrane, a dynamic filtration membrane having very good water permeability was formed.
【００１６】常時連続的に無機凝集剤を生物処理槽２に
添加する方法では、水酸化アルミニウム、水酸化鉄など
の無機汚泥発生量が多くなり、汚泥処理に負担をかける
が、図１に示す本発明によれば、凝集汚泥から再生凝集
剤を得ることができるので、凝集汚泥発生量が非常に少
ないという大きな効果が得られる。なお、図１におい
て、ダイナミック膜ろ過槽５から脱窒素槽２ａへ送られ
る返送汚泥を含む循環消化液１２の返送ラインを有し、
３は硝化槽２ｂへ曝気する空気を示す。In the method in which the inorganic coagulant is always continuously added to the biological treatment tank 2, a large amount of inorganic sludge such as aluminum hydroxide and iron hydroxide is generated, which imposes a burden on sludge treatment. According to the present invention, since the regenerated coagulant can be obtained from coagulated sludge, a great effect that the amount of coagulated sludge generated is very small can be obtained. In addition, in FIG. 1, there is a return line of the circulating digestion liquid 12 containing the return sludge sent from the dynamic membrane filtration tank 5 to the denitrification tank 2a,
Reference numeral 3 denotes air aerated to the nitrification tank 2b.
【００１７】次に、本発明の他の実施態様を説明する。
この実施態様は、下水などのリン含有汚水からリン資源
を回収でき、余剰汚泥が発生しないダイナミックろ過技
術を具体化したものである。図２において、生物処理工
程２からの生物処理水４をダイナミックろ過膜によりろ
過分離された汚泥７Ａに鉱酸９を添加し、金属水酸化物
を溶解し、リン酸イオンとＡｌ又はＦｅイオンを生成さ
せる。また活性汚泥から菌体外高分子を溶出させる。次
に、酸処理スラリ１１を沈殿槽１４により固液分離し、
分離された酸処理汚泥１５は生物処理槽２に供給する。
余剰活性汚泥１３の減量化を行う場合は、分離された酸
処理汚泥１５を汚泥可溶化処理装置１７でオゾン１８に
よる酸化、超音波照射、機械的すり潰し、などの公知の
汚泥可溶化処理を行ったのち、可溶化汚泥１９を生物処
理槽２に供給する。Next, another embodiment of the present invention will be described.
This embodiment embodies a dynamic filtration technology that can recover phosphorus resources from phosphorus-containing wastewater such as sewage and does not generate excess sludge. In FIG. 2, the mineral acid 9 is added to the sludge 7A obtained by filtering and separating the biologically treated water 4 from the biological treatment step 2 with a dynamic filtration membrane to dissolve the metal hydroxide and to remove phosphate ions and Al or Fe ions. To generate. In addition, the extracellular polymer is eluted from the activated sludge. Next, the acid-treated slurry 11 is subjected to solid-liquid separation in the settling tank 14,
The separated acid-treated sludge 15 is supplied to the biological treatment tank 2.
When reducing the amount of the surplus activated sludge 13, the separated acid-treated sludge 15 is subjected to known sludge solubilization treatment such as oxidation by ozone 18 in the sludge solubilization treatment device 17, ultrasonic irradiation, mechanical grinding, and the like. After that, the solubilized sludge 19 is supplied to the biological treatment tank 2.
【００１８】沈殿槽１４からの分離液１６に酸性条件下
でリンを除去できるリン除去剤（鉄系凝集剤、チタン系
凝集剤、鉄系、チタン系、ジルコニウム系リン吸着剤、
活性アルミナなど）を添加して、リンを不溶化又は吸着
によって除去する（リン回収装置２０）ことによりリン
２１を回収する。リンが除去されたＡｌイオン又はＦｅ
イオン含有酸性液２２を、生物処理槽１に供給すると活
性汚泥を凝集できるので、透水性の良いダイナミックろ
過膜を安定して形成できる。A phosphorus removing agent (iron-based coagulant, titanium-based coagulant, iron-based, titanium-based, zirconium-based phosphorus adsorbent, which can remove phosphorus in the separated liquid 16 from the settling tank 14 under acidic conditions,
Phosphorus 21 is recovered by adding phosphorus such as activated alumina and removing phosphorus by insolubilization or adsorption (phosphorus recovery device 20). Al ions or Fe with phosphorus removed
Since the activated sludge can be aggregated by supplying the ion-containing acidic liquid 22 to the biological treatment tank 1, a dynamic filtration membrane having good water permeability can be stably formed.
【００１９】[0019]
【実施例】以下、実施例により本発明を具体的に説明す
るが、本発明はこれらの実施例により何等制限されるも
のではない。EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.
【００２０】実施例１
図１の工程にしたがって、下水（平均水質を第１表に示
す）を対象に本発明の実証試験を行った。第２表に試験
条件を示す。Example 1 A proof test of the present invention was conducted on sewage (average water quality is shown in Table 1) according to the process of FIG. Table 2 shows the test conditions.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表２】 [Table 2]
【００２３】実験の結果、処理開始後１ヶ月後に、処理
状況が安定状態になってからのダイナミックろ過水水質
の平均は、第３表のように高度に窒素、ＢＯＤ、ＳＳが
除去されていた。また１年間に渡り、余剰汚泥引き抜き
は行わなかったが、生物処理槽内の活性汚泥ＭＬＳＳは
４５００〜５４００ｍｇ／リットルを維持した。余剰活
性汚泥の発生量は１９ｇ・ＳＳ／ｄであった。As a result of the experiment, one month after the start of the treatment, the average of the quality of the dynamic filtered water after the treatment condition became stable was that nitrogen, BOD and SS were highly removed as shown in Table 3. . Although the excess sludge was not removed for one year, the activated sludge MLSS in the biological treatment tank was maintained at 4500 to 5400 mg / liter. The amount of excess activated sludge generated was 19 g · SS / d.
【００２４】[0024]
【表３】 [Table 3]
【００２５】比較例１
実施例１において、生物処理槽１から汚泥を引き抜いて
酸処理する工程（酸処理装置１０）を除去した以外は、
同一の条件で試験した。この結果、ダイナミックろ過の
フラックスを４ｍ／ｄに設定すると、ろ過抵抗が大きく
なり、ろ過面積を増加させてフラックスを２ｍ／ｄに低
下する必要があった。また、このフラックスでのダイナ
ミックろ過水のＳＳは、平均１１．５ｍｇ／リットルと
本発明に比べて悪くなった。 また、余剰活性汚泥の発
生量は、平均３０ｇ・ＳＳ／ｄであった。Comparative Example 1 In Example 1, except that the step of withdrawing sludge from the biological treatment tank 1 and treating with acid (acid treatment apparatus 10) was removed.
Tested under the same conditions. As a result, when the flux for dynamic filtration was set to 4 m / d, the filtration resistance increased, and it was necessary to increase the filtration area and reduce the flux to 2 m / d. The SS of dynamic filtered water with this flux was 11.5 mg / liter on average, which was worse than that of the present invention. The amount of surplus activated sludge generated was 30 g · SS / d on average.
【００２６】[0026]
【発明の効果】本発明によれば、下記の効果が得られ
た。
（１）水酸化アルミニウムフロック、水酸化鉄フロック
と生物フロックが共存した状態で、汚泥の一部を引き抜
いて酸処理をしたのち返送し、ダイナミックろ過を行う
ので、ダイナミックろ過膜の透水性が安定して、良く、
大きなフラックスが得られ、かつＳＳの少ない透過水が
得られる。
（２）活性汚泥が酸によって加水分解を受け、生分解性
が向上するので、余剰汚泥発生量が減少する。According to the present invention, the following effects are obtained. (1) In a state where aluminum hydroxide flocs, iron hydroxide flocs and biological flocs coexist, a part of sludge is extracted, acid-treated and returned, and then dynamic filtration is performed, so dynamic permeability of the dynamic filtration membrane is stable. And well,
A large flux can be obtained, and permeated water with little SS can be obtained. (2) Activated sludge is hydrolyzed by an acid and biodegradability is improved, so that the amount of excess sludge generated is reduced.
【図１】本発明の有機性排水の浄化方法の一実施態様の
ブロック図である。FIG. 1 is a block diagram of an embodiment of a method for purifying organic waste water according to the present invention.
【図２】本発明のリンの回収も行う有機性排水の浄化方
法の別の実施態様のブロック図である。FIG. 2 is a block diagram of another embodiment of the method for purifying organic waste water, which also recovers phosphorus according to the present invention.
１ 原水（有機性排水） ２ 生物処理槽 ２ａ 脱窒素槽 ２ｂ 硝化槽 ３ 空気 ４ 生物処理水 ５ ダイナミック膜ろ過槽 ６ 高度処理水 ７ 分離汚泥 ７Ａ 分離汚泥 ７Ｂ 返送汚泥 ８ 引き抜きスラリ ９ 鉱酸 １０ 酸処理装置 １１ 酸処理スラリ １２ 循環硝化液（返送汚泥を含む） １３ 余剰汚泥 １４ 沈殿槽 １５ 酸処理汚泥 １６ 分離液 １７ 汚泥可溶化処理装置 １８ オゾン １９ 可溶化汚泥 ２０ リン回収装置 ２１ 回収リン ２２ 金属イオン含有酸性液 1 Raw water (organic wastewater) 2 biological treatment tank 2a denitrification tank 2b Nitrification tank 3 air 4 biologically treated water 5 Dynamic membrane filtration tank 6 Advanced treated water 7 Separation sludge 7A separation sludge 7B Return sludge 8 Pull-out slurry 9 Mineral acid 10 Acid treatment equipment 11 Acid-treated slurry 12 Circulating nitrification liquid (including returned sludge) 13 Surplus sludge 14 settling tank 15 Acid-treated sludge 16 Separation liquid 17 Sludge solubilization treatment equipment 18 ozone 19 Solubilized sludge 20 Phosphorus recovery device 21 Recovered phosphorus 22 Metallic ion-containing acidic liquid
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０２Ｆ 11/00 Ｃ０２Ｆ 11/00 Ｊ Ｚ (72)発明者 小西 聡史 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 田中 俊博 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 Ｆターム(参考） 4D006 GA47 KA31 KA72 KB22 KD08 PA01 PB08 PC64 4D028 AA08 AC01 BC17 BD11 BD17 4D038 AA08 AB44 AB46 BA04 BA06 BB17 BB19 4D040 BB05 BB24 BB32 BB54 BB57 BB72 4D059 AA05 AA19 BC02 BE31 BE49 BH04 BH05 BH07 BK11 BK12 BK22 CA23 CA28 DA31 DA32 DA33 DA43 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI theme code (reference) C02F 11/00 C02F 11/00 J Z (72) Inventor Satoshi Konishi 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Issue EBARA CORPORATION (72) Inventor Toshihiro Tanaka 11-1 Haneda Asahi-cho, Ota-ku, Tokyo F-term inside EBARA Corporation (reference) 4D006 GA47 KA31 KA72 KB22 KD08 PA01 PB08 PC64 4D028 AA08 AC01 BC17 BD11 BD17 4D038 AA08 AB44 AB46 BA04 BA06 BB17 BB19 4D040 BB05 BB24 BB32 BB54 BB57 BB72 4D059 AA05 AA19 BC02 BE31 BE49 BH04 BH05 BH07 BK11 BK12 BK22 CA23 CA28 DA31 DA32 DA33 DA43
Claims (5)
又はアルミニウム水酸化物フロックと生物汚泥が共存し
た状態で生物処理し、前記共存汚泥をダイナミックろ過
膜によって固液分離してろ過水を取り出すとともに、固
液分離した汚泥又は該生物処理工程の汚泥の一部を引き
抜き、酸を添加して金属水酸化物及び生物汚泥の菌体外
ポリマを溶出させて、鉄又はアルミニウムの金属イオン
含有スラリを生成せしめ、前記鉄又はアルミニウムの金
属イオン含有酸処理スラリを、前記生物処理工程に返送
することを特徴とする有機性排水の浄化方法。1. In a biological treatment step, organic wastewater is biologically treated in a state where iron or aluminum hydroxide flocs and biological sludge coexist, and the coexisting sludge is subjected to solid-liquid separation by a dynamic filtration membrane to take out filtered water. At the same time, the solid-liquid separated sludge or a part of the sludge of the biological treatment process is extracted, and an acid is added to elute the metal hydroxide and the extracellular polymer of the biological sludge, and the slurry containing iron or aluminum metal ions is extracted. A method for purifying organic wastewater, comprising: producing an iron-based or aluminum-containing metal ion-containing acid-treated slurry that is returned to the biological treatment step.
排水を鉄又はアルミニウム水酸化物フロックと生物汚泥
が共存した状態で生物処理し、前記共存汚泥をダイナミ
ックろ過膜によって固液分離してろ過水を取り出すとと
もに、固液分離した汚泥又は該生物処理工程の汚泥の一
部を引き抜き、酸を添加して金属水酸化物及び生物汚泥
の菌体外ポリマを溶出させて、鉄又はアルミニウムの金
属イオン含有スラリを生成せしめ、前記鉄又はアルミニ
ウムの金属イオン含有酸処理スラリを固液分離し、分離
液からリンを化学的に除去し、リンを除去した前記鉄又
はアルミニウムの金属イオン含有酸性液及び前記固液分
離よりの分離汚泥を、前記生物処理工程に返送すること
を特徴とする有機性排水の浄化方法。2. In the biological treatment process, phosphorus-containing organic wastewater is biologically treated in the state where iron or aluminum hydroxide flocs and biological sludge coexist, and the coexisting sludge is subjected to solid-liquid separation by a dynamic filtration membrane to obtain filtered water. And the sludge solid-liquid separated or a part of the sludge of the biological treatment process is extracted, an acid is added to elute metal hydroxide and extracellular polymer of biological sludge, and metal ions of iron or aluminum. A slurry containing iron is generated, the metal ion-containing acid treatment slurry of iron or aluminum is subjected to solid-liquid separation, phosphorus is chemically removed from the separated liquid, and the iron or aluminum metal ion-containing acidic liquid from which phosphorus has been removed and A method for purifying organic wastewater, which comprises returning separated sludge from solid-liquid separation to the biological treatment step.
有酸処理スラリを固液分離した際の分離汚泥を物理化学
的可溶化し、可溶化汚泥を生物処理工程に返送すること
を特徴とする請求項２記載の有機性排水の浄化方法。3. The separated sludge obtained by solid-liquid separation of the acid-treated slurry containing metal ions of iron or aluminum is physicochemically solubilized, and the solubilized sludge is returned to the biological treatment step. 2. The method for purifying organic wastewater according to 2.
硝化脱窒素法により浄化する装置において、有機性排水
を導入し、ダイナミック膜ろ過槽からの硝化液を循環
し、鉄又はアルミニウム水酸化物フロックと生物汚泥の
共存下に処理する硝化槽と脱窒素槽からなる生物処理
槽、前記生物処理槽からの汚泥混合液を処理水と汚泥ス
ラリに固液分離するダイナミック膜ろ過槽、前記前記生
物処理槽からの発生汚泥の一部を引き抜いたスラリに酸
を添加して金属水酸化物を溶解する酸処理装置、及び該
酸処理スラリを生物処理槽（硝化槽）へ返送する配管を
有することを特徴とする有機性排水の浄化装置。4. A device for purifying organic wastewater by a biological nitrification denitrification method by an anaerobic aerobic method, introducing organic wastewater, circulating a nitrification solution from a dynamic membrane filtration tank, and iron or aluminum water. A biological treatment tank consisting of a nitrification tank and a denitrification tank, which are treated in the coexistence of oxide flocs and biological sludge, a dynamic membrane filtration tank for solid-liquid separation of a sludge mixed solution from the biological treatment tank into treated water and sludge slurry, An acid treatment device that dissolves metal hydroxide by adding an acid to a slurry obtained by extracting a part of the sludge generated from the biological treatment tank, and a pipe for returning the acid treated slurry to the biological treatment tank (nitrification tank). A device for purifying organic wastewater, which is characterized by having.
脱リン脱窒素により浄化する装置において、有機性排水
を導入し、ダイナミック膜ろ過槽からの硝化液を循環
し、鉄又はアルミニウム水酸化物フロックと生物汚泥の
共存下に処理する硝化槽と脱窒素槽からなる生物処理
槽、前記生物処理槽からの汚泥混合液を処理水と汚泥ス
ラリに固液分離するダイナミック膜ろ過槽、前記前記生
物処理槽からの発生汚泥の一部を引き抜いたスラリに酸
を添加して金属水酸化物を溶解する酸処理装置、該酸処
理スラリを分離液と酸処理汚泥に固液分離する沈殿槽、
前記酸化処理活性汚泥を可溶化し可溶化汚泥を脱窒素槽
へ返送する配管を接続した汚泥可溶化処理装置、前記分
離液からリン除去剤でリンを回収し、リンが除去された
金属イオン含有酸性液を脱窒素槽へ返送する配管を接続
したリン回収装置、及び前記硝化槽から脱窒素槽への循
環硝化液の循環・返送配管を有することを特徴とする有
機性排水の浄化装置。5. An apparatus for purifying organic wastewater by biological dephosphorization and denitrification by an anaerobic aerobic method, introducing organic wastewater, circulating nitrification solution from a dynamic membrane filtration tank, and iron or aluminum water. A biological treatment tank consisting of a nitrification tank and a denitrification tank, which are treated in the coexistence of oxide flocs and biological sludge, a dynamic membrane filtration tank for solid-liquid separation of a sludge mixed solution from the biological treatment tank into treated water and sludge slurry, An acid treatment device for dissolving metal hydroxide by adding an acid to a slurry obtained by extracting a part of the sludge generated from the biological treatment tank, and a settling tank for solid-liquid separation of the acid treatment slurry into a separation liquid and an acid treatment sludge. ,
A sludge solubilization treatment device connected to a pipe for solubilizing the oxidation-treated activated sludge and returning the solubilized sludge to the denitrification tank, phosphorus is recovered from the separated liquid with a phosphorus removing agent, and the phosphorus-removed metal ion is contained. An apparatus for purifying organic wastewater, comprising a phosphorus recovery device connected to a pipe for returning an acidic liquid to a denitrification tank, and a circulation / return pipe for circulating nitrification liquid from the nitrification tank to the denitrification tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001256247A JP2003062591A (en) | 2001-08-27 | 2001-08-27 | Method for purifying organic waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001256247A JP2003062591A (en) | 2001-08-27 | 2001-08-27 | Method for purifying organic waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003062591A true JP2003062591A (en) | 2003-03-04 |
Family
ID=19084086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001256247A Pending JP2003062591A (en) | 2001-08-27 | 2001-08-27 | Method for purifying organic waste water |
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| Country | Link |
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| JP (1) | JP2003062591A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006320793A (en) * | 2005-05-17 | 2006-11-30 | Japan Organo Co Ltd | Method and apparatus for treating waste water |
| JP2008221190A (en) * | 2007-03-15 | 2008-09-25 | Sumitomo Heavy Ind Ltd | Wastewater treatment apparatus |
| CN102417273A (en) * | 2011-10-10 | 2012-04-18 | 北京建筑工程学院 | Dynamic membrane purifying reactor and method for removing ammonia nitrogen and organic matters from reclaimed water |
| CN102417250A (en) * | 2011-10-10 | 2012-04-18 | 北京建筑工程学院 | Dynamic membrane purification reactor and method for removing phosphorus from regenerated water |
| CN103755071A (en) * | 2014-01-10 | 2014-04-30 | 安徽锋亚环境技术有限公司 | Emergency phosphorus removal adsorption device for micro eutrophication of urban landscape water |
| CN106006847A (en) * | 2016-07-13 | 2016-10-12 | 西安建筑科技大学 | Dynamic membrane sewage direct filtering reactor based on different sewage qualities and operation method |
| CN106145338A (en) * | 2016-08-08 | 2016-11-23 | 无锡合思环境技术有限公司 | A kind of Dynamic Membrane anaerobic reactor |
| CN106587420A (en) * | 2016-11-22 | 2017-04-26 | 深圳市康源环境纳米科技有限公司 | System and method for removing heavy metals from wastewater |
-
2001
- 2001-08-27 JP JP2001256247A patent/JP2003062591A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006320793A (en) * | 2005-05-17 | 2006-11-30 | Japan Organo Co Ltd | Method and apparatus for treating waste water |
| JP2008221190A (en) * | 2007-03-15 | 2008-09-25 | Sumitomo Heavy Ind Ltd | Wastewater treatment apparatus |
| CN102417273A (en) * | 2011-10-10 | 2012-04-18 | 北京建筑工程学院 | Dynamic membrane purifying reactor and method for removing ammonia nitrogen and organic matters from reclaimed water |
| CN102417250A (en) * | 2011-10-10 | 2012-04-18 | 北京建筑工程学院 | Dynamic membrane purification reactor and method for removing phosphorus from regenerated water |
| CN103755071A (en) * | 2014-01-10 | 2014-04-30 | 安徽锋亚环境技术有限公司 | Emergency phosphorus removal adsorption device for micro eutrophication of urban landscape water |
| CN103755071B (en) * | 2014-01-10 | 2015-12-30 | 安徽锋亚环境技术有限公司 | For the emergent dephosphorization adsorption unit of micro-eutrophication city landscape water body |
| CN106006847A (en) * | 2016-07-13 | 2016-10-12 | 西安建筑科技大学 | Dynamic membrane sewage direct filtering reactor based on different sewage qualities and operation method |
| CN106145338A (en) * | 2016-08-08 | 2016-11-23 | 无锡合思环境技术有限公司 | A kind of Dynamic Membrane anaerobic reactor |
| CN106587420A (en) * | 2016-11-22 | 2017-04-26 | 深圳市康源环境纳米科技有限公司 | System and method for removing heavy metals from wastewater |
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