JPH08192196A - Biological sludge ozonator - Google Patents
Biological sludge ozonatorInfo
- Publication number
- JPH08192196A JPH08192196A JP625095A JP625095A JPH08192196A JP H08192196 A JPH08192196 A JP H08192196A JP 625095 A JP625095 A JP 625095A JP 625095 A JP625095 A JP 625095A JP H08192196 A JPH08192196 A JP H08192196A
- Authority
- JP
- Japan
- Prior art keywords
- ozone
- liquid
- pressure
- gas
- sludge
- 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.)
- Granted
Links
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treatment Of Sludge (AREA)
Abstract
(57)【要約】
【目的】 低コストで効率よく生物汚泥をオゾン処理す
ることが可能で、しかも装置を小型化することができる
生物汚泥のオゾン処理装置を提供する。
【構成】 給液ポンプ２を駆動して汚泥含有液を反応槽
１に加圧状態で導入するとともに、オゾン発生機９で発
生するオゾン含有ガスを加圧状態で導入し、散気装置８
で散気して汚泥をＢＯＤに酸化分解する。排オゾンガス
および槽内液（オゾン処理液）は気液取出部１８を通し
て、気液排出路１９から排出し、このとき反応槽１内の
圧力を圧力検出装置１７で測定し、所定の圧力に達した
ときに圧力調整弁２０を開閉することにより、反応槽１
内の圧力を０．５〜３ｋｇｆ／ｃｍ 2（ゲージ圧）に維
持し、加圧した状態で気液接触を行う生物汚泥のオゾン
処理装置。
(57) [Summary]
[Purpose] Ozone treatment of biological sludge at low cost and efficiency
It is possible to reduce the size of the device.
An ozone treatment device for biological sludge is provided.
[Structure] Drive the liquid feed pump 2 to react the sludge-containing liquid with the reaction tank
1 in the pressurized state and the ozone generator 9
The ozone-containing gas to be produced is introduced under pressure to diffuse the gas.
It diffuses and oxidatively decomposes sludge into BOD. Exhausted ozone gas
And the liquid in the tank (ozonated liquid) is passed through the gas-liquid take-out section 18.
And is discharged from the gas-liquid discharge path 19,
The pressure was measured by the pressure detection device 17, and the predetermined pressure was reached.
By opening and closing the pressure control valve 20 at times, the reaction tank 1
The internal pressure is 0.5 to 3 kgf / cm 2(Gauge pressure)
Ozone in biological sludge that holds and contacts gas-liquid under pressure
Processing equipment.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、生物汚泥をオゾン酸化
するための生物汚泥のオゾン処理装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological sludge ozone treatment apparatus for ozone-oxidizing biological sludge.
【０００２】[0002]
【従来の技術】活性汚泥処理における余剰汚泥等の減容
化などの目的で、余剰汚泥等の生物汚泥（以下、単に汚
泥という場合がある）にオゾンを反応させて酸化分解す
ることが行われている。従来の汚泥のオゾン処理方法で
は、反応槽中に汚泥含有液を満たし、この汚泥含有液中
にオゾン含有ガスを吹込んで気液接触させ、汚泥を分解
する装置が用いられている。しかし、このような従来の
装置は液深１ｍ程度の反応槽を用いて大気圧下で運転さ
れているため、オゾン濃度が低い状態で反応が行われ、
反応速度は低い。このため汚泥をオゾンと充分に反応さ
せるためには滞留時間を長くする必要があり、効率的な
処理が行われないほか、装置が大型化するという問題点
がある。オゾン濃度の高いオゾン含有ガスを使用すれば
反応速度を高くすることはできるが、この場合は高価な
オゾンが無駄に消費されやすく、処理コストが高くな
る。また被処理液の機械的攪拌により気液接触面積を大
きくし、処理効率を改善することもできるが、この場合
も処理コストが高くなるという問題点がある。2. Description of the Related Art For the purpose of reducing the volume of surplus sludge and the like in activated sludge treatment, biological sludge such as surplus sludge (hereinafter sometimes simply referred to as sludge) is reacted with ozone for oxidative decomposition. ing. In the conventional sludge ozone treatment method, an apparatus is used in which a reaction vessel is filled with a sludge-containing liquid, and ozone-containing gas is blown into the sludge-containing liquid to bring them into gas-liquid contact to decompose the sludge. However, since such a conventional apparatus is operated under atmospheric pressure using a reaction tank having a liquid depth of about 1 m, the reaction is performed in a state where the ozone concentration is low,
The reaction rate is low. Therefore, in order to sufficiently react the sludge with ozone, it is necessary to prolong the residence time, which causes a problem that efficient treatment is not performed and the apparatus becomes large. If an ozone-containing gas having a high ozone concentration is used, the reaction rate can be increased, but in this case, expensive ozone is likely to be wastefully consumed, resulting in a high treatment cost. Further, it is possible to increase the gas-liquid contact area and improve the processing efficiency by mechanically stirring the liquid to be processed, but in this case also there is a problem that the processing cost becomes high.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、低コ
ストで効率よく生物汚泥をオゾン処理することが可能
で、しかも装置を小型化することができる生物汚泥のオ
ゾン処理装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide an ozone treatment apparatus for biological sludge, which is capable of efficiently ozone-treating biological sludge at low cost and which can be downsized. Is.
【０００４】[0004]
【課題を解決するための手段】本発明は、生物汚泥含有
液を受入れて０．５〜３ｋｇｆ／ｃｍ2（ゲージ圧）の
加圧状態でオゾン処理を行う反応槽と、この反応槽に生
物汚泥含有液を加圧状態で導入する汚泥導入手段と、前
記反応槽にオゾン含有ガスを加圧状態で導入するオゾン
導入手段と、前記反応槽内を前記加圧状態に維持するよ
うにオゾン処理液および／または排オゾンガスを排出す
る圧力調整弁とを備えていることを特徴とする生物汚泥
のオゾン処理装置である。The present invention is directed to a reaction tank which receives a biological sludge-containing liquid and performs ozone treatment under a pressure of 0.5 to 3 kgf / cm 2 (gauge pressure), and a biological tank in the reaction tank. Sludge introducing means for introducing sludge-containing liquid under pressure, ozone introducing means for introducing ozone-containing gas into the reaction tank under pressure, and ozone treatment for maintaining the inside of the reaction tank under the pressure An ozone treatment apparatus for biological sludge, comprising: a pressure adjusting valve for discharging liquid and / or exhaust ozone gas.
【０００５】本発明で処理の対象となる生物汚泥は、好
気性処理、嫌気性処理等において生成する生物汚泥を含
む汚泥であり、余剰汚泥のように生物汚泥を主体とする
ものが好ましいが、凝集汚泥のように若干の無機物を含
むものでもよい。The biological sludge to be treated in the present invention is a sludge containing biological sludge produced in aerobic treatment, anaerobic treatment and the like, and it is preferable that the main component is biological sludge such as excess sludge. It may be one that contains a small amount of inorganic substances such as coagulated sludge.
【０００６】本発明においてオゾン処理に用いる反応槽
は、生物汚泥含有液中の汚泥を０．５〜３ｋｇｆ／ｃｍ
2（ゲージ圧）、好ましくは０．７〜２ｋｇｆ／ｃｍ
2（ゲージ圧）の加圧状態でオゾンと反応させて酸化処
理するための槽である。この際使用するオゾン含有ガス
としてはオゾン含有空気、オゾン化空気などがあげられ
る。オゾン含有ガスの導入量は、導入される生物汚泥の
ＶＳＳ重量に対してオゾンとして０．２〜１０重量％、
好ましくは３〜５重量％とするのが望ましい。またオゾ
ン含有ガスの流量は、反応槽のガス線速度として１〜１
００ｍ／ｈｒ、好ましくは５〜２０ｍ／ｈｒとするのが
望ましい。In the present invention, the reaction tank used for ozone treatment contains 0.5 to 3 kgf / cm of sludge in the liquid containing biological sludge.
2 (gauge pressure), preferably 0.7-2 kgf / cm
It is a tank for oxidation treatment by reacting with ozone under a pressure of 2 (gauge pressure). Examples of the ozone-containing gas used at this time include ozone-containing air and ozonized air. The amount of the ozone-containing gas introduced is 0.2 to 10% by weight as ozone with respect to the VSS weight of the biological sludge to be introduced,
It is desirable that the amount is preferably 3 to 5% by weight. The flow rate of the ozone-containing gas is 1 to 1 as the gas linear velocity in the reaction tank.
It is desirable to set it to 00 m / hr, preferably 5 to 20 m / hr.
【０００７】オゾン含有ガスはコンプレッサまたはエジ
ェクタなどのオゾン導入手段により、前記圧力となるよ
うに加圧または減圧下で反応槽に導入することができる
が、オゾン発生機を前記圧力範囲で運転し、生成するオ
ゾン含有ガスをそのまま加圧状態で反応槽に導入するよ
うに構成するのが好ましい。The ozone-containing gas can be introduced into the reaction tank under pressure or under reduced pressure so as to reach the above-mentioned pressure by ozone introduction means such as a compressor or an ejector, but the ozone generator is operated in the above pressure range, It is preferable that the generated ozone-containing gas is introduced into the reaction tank as it is under pressure.
【０００８】本発明では、反応槽内を前記加圧状態に維
持するように、オゾン処理液および／または排オゾンガ
スを排出する圧力調整弁を設ける。圧力調整弁として
は、反応槽内の圧力に応じて反応槽から排出するオゾン
処理液の量を調整する圧力調整弁、または反応槽内の圧
力に応じて反応槽から排出する排オゾンガスの量を調整
する圧力調整弁、あるいはこれらを組合せたものなどが
使用できる。また圧力調整弁としては、圧力に応じて弁
が開閉したり、開度を調整して、反応槽内を所定の圧力
に維持する減圧弁や自力式圧力調整弁、ならびに制御器
の指令により所定の圧力となるように弁の開度が調整さ
れる圧力調整弁などが使用できる。In the present invention, a pressure adjusting valve for discharging the ozone treatment liquid and / or the exhaust ozone gas is provided so as to maintain the pressurized state in the reaction tank. As the pressure adjusting valve, a pressure adjusting valve that adjusts the amount of the ozonated liquid discharged from the reaction tank according to the pressure in the reaction tank, or the amount of exhaust ozone gas discharged from the reaction tank according to the pressure in the reaction tank is used. A pressure adjusting valve for adjusting or a combination thereof can be used. The pressure regulating valve is a pressure reducing valve or a self-powered pressure regulating valve that opens and closes or adjusts the opening according to the pressure to maintain the inside of the reaction tank at a predetermined pressure. It is possible to use a pressure regulating valve or the like in which the opening degree of the valve is regulated so that the pressure becomes.
【０００９】なお本発明では、反応槽内の液のｐＨを一
定値以下、例えばｐＨ５以下に維持するように、酸注入
装置を設けるのが好ましい。この場合反応槽に酸を注入
してｐＨ調整し、あるいは生物汚泥含有液に酸を注入し
てｐＨ調整したのち反応槽に導入するように構成しても
よい。これにより、さらに効率のよいオゾン処理を行う
ことができ、装置をさらに小型化できる。また反応槽に
おける生物汚泥とオゾンとの接触効率を高くするため
に、反応槽に充填材層を形成したり、泡沫層を形成した
り、あるいは撹拌機を設けたりすることもできる。In the present invention, it is preferable to provide an acid injection device so as to maintain the pH of the liquid in the reaction tank at a constant value or lower, for example, pH 5 or lower. In this case, the acid may be injected into the reaction tank to adjust the pH, or the acid may be injected into the biological sludge-containing liquid to adjust the pH and then introduced into the reaction tank. Thereby, more efficient ozone treatment can be performed, and the apparatus can be further downsized. Further, in order to improve the contact efficiency between the biological sludge and ozone in the reaction tank, a filler layer, a foam layer, or a stirrer may be provided in the reaction tank.
【００１０】[0010]
【作用】本発明の生物汚泥のオゾン処理装置において
は、汚泥導入手段により反応槽に生物汚泥含有液を加圧
状態で導入し、ここにオゾン導入手段によりオゾン含有
ガスを加圧状態で導入して、０．５〜３ｋｇｆ／ｃｍ2
（ゲージ圧）、好ましくは０．７〜２ｋｇｆ／ｃｍ
2（ゲージ圧）に加圧した状態で生物汚泥含有液と接触
させると、汚泥がオゾンと反応して酸化分解され、ＢＯ
Ｄ成分に変換される。In the ozone treatment apparatus for biological sludge of the present invention, the biological sludge-containing liquid is introduced into the reaction tank under pressure by the sludge introducing means, and the ozone-containing gas is introduced under pressure by the ozone introducing means. 0.5 to 3 kgf / cm 2
(Gauge pressure), preferably 0.7 to 2 kgf / cm
When it is brought into contact with the biological sludge-containing liquid while being pressurized to 2 (gauge pressure), the sludge reacts with ozone and is oxidatively decomposed, and
Converted to D component.
【００１１】反応槽においてオゾンガスが液側に移動す
る際、物質移動の速度は接触面積と濃度差に比例する
が、反応槽内を大気圧に維持すると、濃度差には限界が
ある。これに対して反応槽内を加圧状態に維持すると、
圧力に比例して見かけ上高濃度のオゾン含有ガスを利用
できるようになるので、物質移動速度が速くなってオゾ
ン吸収効率が高くなり、汚泥の酸化効率が高くなる。例
えば、空気からオゾンを発生させるオゾン発生機では、
最大で５０ｇ／Ｎｍ3程度、通常２０ｇ／Ｎｍ3程度の濃
度でしかオゾンを発生させることができないので、加圧
しない場合のオゾン濃度は最大で５０ｇ／Ｎｍ3程度、
通常２０ｇ／Ｎｍ3程度になるが、１ｋｇｆ／ｃｍ2（ゲ
ージ圧）に加圧した場合の見かけ濃度は最大で１００ｇ
／ｍ3程度、通常４０ｇ／ｍ3程度、また２ｋｇｆ／ｃｍ
2（ゲージ圧）に加圧した場合の見かけ濃度は最大で１
５０ｇ／ｍ3程度、通常６０ｇ／ｍ3程度に上昇すること
になる。この場合、オゾン発生機で発生する加圧された
オゾン含有ガスをそのまま反応槽に導入しても、見かけ
上高濃度のオゾン含有ガスを利用できる。When ozone gas moves to the liquid side in the reaction tank, the rate of mass transfer is proportional to the contact area and the concentration difference. However, if the pressure inside the reaction tank is maintained at atmospheric pressure, the difference in concentration is limited. On the other hand, if the pressure inside the reaction tank is maintained,
Since the apparently high concentration of ozone-containing gas can be used in proportion to the pressure, the mass transfer rate is increased, the ozone absorption efficiency is increased, and the sludge oxidation efficiency is increased. For example, in an ozone generator that generates ozone from air,
Since ozone can be generated only at a concentration of about 50 g / Nm 3 at maximum, usually about 20 g / Nm 3 , the ozone concentration when not pressurized is at most about 50 g / Nm 3 ,
Normally, it will be about 20 g / Nm 3 , but the maximum apparent density when pressurized to 1 kgf / cm 2 (gauge pressure) is 100 g.
/ M 3 approximately, typically 40 g / m 3 approximately and 2 kgf / cm
Maximum apparent density when pressurized to 2 (gauge pressure) is 1
It will rise to about 50 g / m 3 , usually about 60 g / m 3 . In this case, even if the pressurized ozone-containing gas generated by the ozone generator is directly introduced into the reaction tank, the apparently high-concentration ozone-containing gas can be used.
【００１２】本発明のオゾン処理装置は上記のように効
率よくオゾン処理ができ、また加圧しない状態でオゾン
処理する場合に比べて装置を小型化できるので、それだ
け低コストの装置となる。オゾン濃度が高くなると汚泥
との反応速度は指数的に上昇し、その結果として反応槽
容積は指数的に小さくすることができる。また酸注入装
置を設け、反応槽内をｐＨ５以下に調整してオゾン処理
を行うとオゾン処理効率はさらによくなり、装置をさら
に小型化できる。The ozone treatment apparatus of the present invention can efficiently perform ozone treatment as described above, and can reduce the size of the apparatus as compared with the case where ozone treatment is performed without pressurization, so that the apparatus can be reduced in cost accordingly. When the ozone concentration increases, the reaction rate with sludge exponentially increases, and as a result, the reaction tank volume can be exponentially reduced. Further, when an acid injection device is provided and the inside of the reaction tank is adjusted to pH 5 or less and ozone treatment is performed, ozone treatment efficiency is further improved, and the device can be further downsized.
【００１３】本発明のオゾン処理装置は、生物処理槽、
例えば好気性処理槽から生物汚泥含有液として槽内の混
合液または余剰汚泥を引抜いてオゾン処理する場合に利
用でき、こうしてオゾン処理したオゾン処理液は生物処
理槽に導入して生物処理することにより、生物分解が可
能となり、汚泥の減容化が行われる。The ozone treatment apparatus of the present invention comprises a biological treatment tank,
For example, it can be used when the mixed solution or excess sludge in the tank is extracted from the aerobic treatment tank as a biological sludge-containing liquid and subjected to ozone treatment, and the ozone-treated ozone treated liquid is introduced into the biological treatment tank and biologically treated. , Biodegradation becomes possible and the volume of sludge is reduced.
【００１４】[0014]
【実施例】次に本発明を図面の実施例により説明する。
図１〜図３はそれぞれ別の実施例の生物汚泥のオゾン処
理装置を示す系統図である。図１において、１は反応槽
で、０．５〜３ｋｇｆ／ｃｍ2（ゲージ圧）、好ましく
は０．７〜２ｋｇｆ／ｃｍ2（ゲージ圧）の加圧状態で
オゾン処理するように構成され、底部には給液ポンプ２
を有する汚泥含有液導入路３と、酸注入装置４から連絡
する酸注入路５とが接続している。また反応槽１内下部
にはオゾン含有ガスを吹込む散気装置８が設けられ、オ
ゾン発生機９からオゾン含有ガス導入路１０が接続して
いる。オゾン発生機９にはドライヤ１１およびコンプレ
ッサ１２が連絡路１３、１４により連絡して直列に接続
している。The present invention will now be described with reference to the embodiments of the drawings.
1 to 3 are system diagrams showing biological sludge ozone treatment apparatuses according to different embodiments. In FIG. 1, reference numeral 1 denotes a reaction tank, which is configured to perform ozone treatment under a pressurized state of 0.5 to 3 kgf / cm 2 (gauge pressure), preferably 0.7 to 2 kgf / cm 2 (gauge pressure), Liquid supply pump 2 at the bottom
The sludge-containing liquid introduction path 3 having the above is connected to the acid injection path 5 connected from the acid injection device 4. An air diffuser 8 for blowing an ozone-containing gas is provided in the lower part of the reaction tank 1, and an ozone-containing gas introduction passage 10 is connected from an ozone generator 9. A dryer 11 and a compressor 12 are connected to the ozone generator 9 via communication paths 13 and 14 and connected in series.
【００１５】反応槽１内上部には圧力検出装置１７およ
び気液取出部１８が設けられ、気液取出部１８には気液
排出路１９が接続している。気液排出路１９には圧力調
整弁２０およびｐＨ検出装置２１が設けられ、圧力検出
装置１７が圧力調整弁２０、ｐＨ検出装置２１が酸注入
装置４を制御するように構成されている。A pressure detection device 17 and a gas / liquid take-out section 18 are provided in the upper part of the reaction tank 1, and a gas / liquid discharge passage 19 is connected to the gas / liquid take-out section 18. A pressure adjusting valve 20 and a pH detecting device 21 are provided in the gas / liquid discharge passage 19, and the pressure detecting device 17 is configured to control the pressure adjusting valve 20 and the pH detecting device 21 to control the acid injection device 4.
【００１６】図１の装置により生物汚泥含有液をオゾン
処理するには、給液ポンプ２を駆動して汚泥含有液導入
路３から生物汚泥含有液を加圧状態で反応槽１に導入す
るとともに、オゾン発生機９からオゾン含有ガス導入路
１０を通してオゾン含有ガスを前記圧力に加圧した状態
で導入し、散気装置８で槽内液中に散気する。これによ
り槽内液とオゾン含有ガスとを接触させて汚泥を酸化分
解する。オゾン含有ガスはコンプレッサ１２で加圧した
空気をドライヤ１１で乾燥した後、オゾン発生機９で発
生させる。オゾン発生機９でのオゾン生成は、通常０．
５〜３ｋｇｆ／ｃｍ2（ゲージ圧）、効率面からは０．
７〜２ｋｇｆ／ｃｍ2（ゲージ圧）で運転されるので、
反応槽１の圧力をそれと同等または低い値に設定するこ
とにより、オゾン発生機９で発生する加圧状態のオゾン
含有ガスをそのまま（さらに加圧することなく）反応槽
１に導入して、反応槽１を加圧状態にすることができ
る。In order to treat the biological sludge-containing liquid with ozone by the apparatus of FIG. 1, the feed pump 2 is driven to introduce the biological sludge-containing liquid from the sludge-containing liquid introducing passage 3 into the reaction tank 1 under pressure. The ozone-containing gas is introduced from the ozone generator 9 through the ozone-containing gas introduction passage 10 while being pressurized to the above pressure, and is diffused into the liquid in the tank by the diffuser 8. As a result, the liquid in the tank is brought into contact with the ozone-containing gas to oxidize and decompose the sludge. The ozone-containing gas is generated by the ozone generator 9 after the air pressurized by the compressor 12 is dried by the dryer 11. Ozone generation in the ozone generator 9 is usually 0.
5 to 3 kgf / cm 2 (gauge pressure), and in terms of efficiency, it is 0.
Since it is operated at 7 to 2 kgf / cm 2 (gauge pressure),
By setting the pressure of the reaction tank 1 to a value equal to or lower than that, the pressurized ozone-containing gas generated in the ozone generator 9 is introduced into the reaction tank 1 as it is (without further pressurization), 1 can be under pressure.
【００１７】排オゾンガスおよび槽内液（オゾン処理
液）は気液取出部１８を通して、気液排出路１９から排
出する。このとき反応槽１内の圧力を圧力検出装置１７
で測定し、その信号を圧力調整弁２０に送り、所定の圧
力に達したときに圧力調整弁２０を開閉することによ
り、反応槽１内を前記圧力に維持する。槽内液および排
オゾンガスは通常一緒に気液取出部１８から排出する
が、槽内液の液面が気液取出部１８の開口部より下にな
ると排オゾンガスだけが排気され、また液面が上になる
とオゾン処理液だけが取出され、液面は一定に維持され
る。オゾン処理液のｐＨはｐＨ検出装置２１で測定し、
その信号を酸注入装置４に送り、酸注入路５から酸を注
入して槽内液のｐＨを５以下に調整する。注入する酸と
しては、硫酸、塩酸、硝酸などの無機酸が好ましい。The exhaust ozone gas and the liquid in the tank (ozone treated liquid) are discharged from the gas-liquid discharge passage 19 through the gas-liquid take-out section 18. At this time, the pressure in the reaction tank 1 is controlled by the pressure detection device 17
And the signal is sent to the pressure control valve 20, and when the pressure reaches a predetermined pressure, the pressure control valve 20 is opened and closed to maintain the pressure in the reaction tank 1. The liquid in the tank and the discharged ozone gas are usually discharged together from the gas-liquid take-out section 18. However, when the liquid level of the liquid in the tank becomes lower than the opening of the gas-liquid take-out section 18, only the discharged ozone gas is discharged, and the liquid level becomes At the top, only the ozonized liquid is taken out and the liquid surface is kept constant. The pH of the ozone treatment liquid is measured by the pH detection device 21,
The signal is sent to the acid injection device 4, and acid is injected from the acid injection path 5 to adjust the pH of the liquid in the tank to 5 or less. The acid to be injected is preferably an inorganic acid such as sulfuric acid, hydrochloric acid or nitric acid.
【００１８】このように反応槽１内は加圧状態に維持さ
れるので、オゾン吸収効率が高くなり、汚泥の酸化効率
が高くなる。また槽内液のｐＨを５以下に制御している
ので、さらに効率よくオゾン処理することができる。こ
れにより効率よくオゾン処理を行うことができ、装置は
小型化できる。Since the pressure inside the reaction tank 1 is maintained in this manner, the ozone absorption efficiency is increased and the sludge oxidation efficiency is increased. Moreover, since the pH of the liquid in the tank is controlled to 5 or less, ozone treatment can be performed more efficiently. As a result, ozone treatment can be performed efficiently, and the device can be downsized.
【００１９】なお図１の圧力調整弁２０弁としては減圧
弁または自力式圧力調整弁などを使用することもでき、
この場合は圧力検出装置１７は省略される。また図１の
酸注入装置４、ｐＨ検出装置２１および酸注入路５は、
場合によっては省略することもできる。さらに排オゾン
ガスを排出するための排オゾンガス路と、オゾン処理液
を取出すための処理液取出路を別々に設けることもでき
る。この場合排オゾンガス路および処理液取出路にそれ
ぞれ圧力調整弁を設けて所定の圧力を維持する。図１の
処理では、汚泥含有液としては、汚泥の好気性生物処理
系の曝気槽内の混合液、その固液分離汚泥などが好まし
く使用でき、オゾン処理液は好気性生物処理系の曝気槽
に返送することができる。A pressure reducing valve or a self-powered pressure adjusting valve may be used as the pressure adjusting valve 20 shown in FIG.
In this case, the pressure detection device 17 is omitted. Further, the acid injection device 4, the pH detection device 21 and the acid injection path 5 in FIG.
In some cases, it can be omitted. Further, it is possible to separately provide an exhaust ozone gas passage for discharging the exhaust ozone gas and a treatment liquid take-out passage for taking out the ozone treatment liquid. In this case, a pressure adjusting valve is provided in each of the exhaust ozone gas passage and the treatment liquid outlet passage to maintain a predetermined pressure. In the treatment of FIG. 1, as the sludge-containing liquid, a mixed liquid in the aeration tank of the aerobic biological treatment system of sludge, the solid-liquid separation sludge, etc. can be preferably used, and the ozone treatment liquid is the aeration tank of the aerobic biological treatment system. Can be sent back to.
【００２０】図２では、反応槽１には下部から槽内液を
引抜いて頂部に循環するように循環路３１が接続し、そ
の中間部には循環ポンプ３２が設けられ、その先端部は
反応槽１内の下部まで伸びて気液吹出部３３が設けられ
ている。循環路３１の途中には給液ポンプ２を有する汚
泥含有液導入路３が接続し、この接続点と気液吹出部３
３の中間部にエジェクタ３４が設けられ、オゾン発生機
９からオゾン含有ガス導入路１０が接続している。また
反応槽１上部には圧力制御スイッチ３５および気液取出
部１８が設けられ、気液取出部１８には気液排出路１９
が接続している。気液排出路１９には圧力制御スイッチ
３５により制御される圧力調整弁３６およびｐＨ検出装
置２１が設けられている。その他の構成は図１と同様で
ある。In FIG. 2, a circulation passage 31 is connected to the reaction tank 1 so as to circulate the liquid in the tank from the lower part and circulate it to the top, a circulation pump 32 is provided in the middle part thereof, and the tip part thereof is a reaction chamber. A gas-liquid blowout part 33 is provided extending to the lower part in the tank 1. A sludge-containing liquid introducing passage 3 having a liquid supply pump 2 is connected in the middle of the circulation passage 31, and this connection point and the gas-liquid blowing portion 3 are connected.
An ejector 34 is provided at an intermediate portion of 3, and an ozone-containing gas introduction path 10 is connected from the ozone generator 9. Further, a pressure control switch 35 and a gas / liquid take-out section 18 are provided above the reaction tank 1, and a gas / liquid discharge path 19 is provided in the gas / liquid take-out section 18.
Is connected. A pressure adjusting valve 36 controlled by a pressure control switch 35 and a pH detector 21 are provided in the gas / liquid discharge path 19. Other configurations are the same as those in FIG.
【００２１】図２の装置により生物汚泥含有液をオゾン
処理するには、循環ポンプ３２を駆動して槽内液を循環
するとともに、給液ポンプ２を駆動して汚泥含有液導入
路３から生物汚泥含有液を反応槽１に導入して加圧す
る。このときエジェクタ３４からオゾン含有ガスを吸引
して液と混合し、気液吹出部３３から槽内液中に吹出
す。この場合槽内液は激しく撹拌されるので、オゾンと
汚泥とが十分に接触し、オゾン吸収率は高くなる。In order to treat the biological sludge-containing liquid with the apparatus shown in FIG. 2, the circulation pump 32 is driven to circulate the liquid in the tank, and the liquid supply pump 2 is driven to introduce the biological fluid from the sludge-containing liquid introduction path 3. The sludge-containing liquid is introduced into the reaction tank 1 and pressurized. At this time, the ozone-containing gas is sucked from the ejector 34, mixed with the liquid, and blown out from the gas-liquid blowing portion 33 into the liquid in the tank. In this case, since the liquid in the tank is vigorously stirred, the ozone and the sludge are brought into sufficient contact with each other, and the ozone absorption rate is increased.
【００２２】排オゾンガスおよび槽内液は気液取出部１
８を通して気液排出路１９から排出する。図２の場合、
圧力制御スイッチ３５により圧力調整弁３６を開閉する
ことにより反応槽１内を前記圧力に維持する。その他の
処理は図１の場合と同様である。The exhausted ozone gas and the liquid in the tank are the gas-liquid take-out section 1.
The gas is discharged from the gas-liquid discharge path 19 through 8. In the case of FIG.
The pressure inside the reaction tank 1 is maintained at the above-mentioned pressure by opening and closing the pressure adjusting valve 36 by the pressure control switch 35. Other processes are the same as those in FIG.
【００２３】図３では、反応槽１の下部に圧力制御スイ
ッチ３５および処理液取出部４１が設けられ、処理液取
出部４１には処理液取出路４２が接続している。処理液
取出路４２には圧力制御スイッチ３５により制御される
圧力調整弁３６が設けられている。反応槽１上部には汚
泥含有液導入装置４３が設けられ、給液ポンプ２を有す
る汚泥含有液導入路３が接続している。汚泥含有液導入
路３にはｐＨ検出装置２１が設けられ、また酸注入装置
４から酸注入路５が接続し、ｐＨ調整後の生物汚泥含有
液が反応槽１に導入できるように構成されている。また
反応槽１上部には減圧弁４４を有する排オゾンガス路４
５が接続している。反応槽１内には撹拌装置４６が設け
られている。その他の構成は図１の場合と同様である。In FIG. 3, a pressure control switch 35 and a processing liquid outlet 41 are provided at the bottom of the reaction tank 1, and a processing liquid outlet 42 is connected to the processing liquid outlet 41. A pressure adjusting valve 36 controlled by the pressure control switch 35 is provided in the processing liquid outlet 42. A sludge-containing liquid introducing device 43 is provided above the reaction tank 1, and a sludge-containing liquid introducing passage 3 having a liquid supply pump 2 is connected thereto. A pH detection device 21 is provided in the sludge-containing liquid introduction path 3, and an acid injection device 5 is connected to the acid injection device 4 so that the biological sludge-containing liquid after pH adjustment can be introduced into the reaction tank 1. There is. Further, the exhaust ozone gas passage 4 having a pressure reducing valve 44 is provided above the reaction tank 1.
5 is connected. A stirrer 46 is provided in the reaction tank 1. Other configurations are the same as those in FIG.
【００２４】図３の装置により生物汚泥含有液をオゾン
処理するには、給液ポンプ２を駆動し、汚泥含有液導入
路３を通して汚泥含有液導入装置４３から生物汚泥含有
液を加圧状態で反応槽１に導入する。この間液のｐＨを
ｐＨ検出装置２１で測定し、その信号を酸注入装置４に
送り、ｐＨ５以下になるように酸注入装置４から酸を注
入する。オゾン含有ガスは図１と同様にして加圧状態で
反応槽１に導入し、槽内液と接触させて汚泥を分解す
る。槽内液は撹拌装置４６により撹拌して気液接触効率
をよくする。In order to treat the biological sludge-containing liquid with the device of FIG. 3, the liquid feed pump 2 is driven and the biological sludge-containing liquid is pressurized from the sludge-containing liquid introducing device 43 through the sludge-containing liquid introducing passage 3. It is introduced into the reaction tank 1. During this period, the pH of the liquid is measured by the pH detection device 21, the signal is sent to the acid injection device 4, and the acid is injected from the acid injection device 4 so that the pH becomes 5 or less. The ozone-containing gas is introduced into the reaction tank 1 under pressure in the same manner as in FIG. 1 and brought into contact with the liquid in the tank to decompose the sludge. The liquid in the tank is stirred by the stirring device 46 to improve the gas-liquid contact efficiency.
【００２５】排オゾンガスは減圧弁４４を通して排オゾ
ンガス路４５から排出する。オゾン処理液は圧力制御ス
イッチ３５により制御される圧力調整弁３６を通して処
理液取出路４２から取出す。図３の場合、圧力制御スイ
ッチ３５により圧力調整弁３６を制御して反応槽１内を
前記圧力に維持する。その他の処理は図１の場合と同様
である。なお撹拌装置４６は省略することもできるし、
撹拌装置４６の代わりに充填材層を反応槽１内に形成す
ることもできる。The exhaust ozone gas is exhausted from the exhaust ozone gas passage 45 through the pressure reducing valve 44. The ozone treatment liquid is taken out from the treatment liquid take-out passage 42 through the pressure adjusting valve 36 controlled by the pressure control switch 35. In the case of FIG. 3, the pressure control switch 35 controls the pressure adjusting valve 36 to maintain the pressure in the reaction tank 1 at the above-mentioned pressure. Other processes are the same as those in FIG. The stirrer 46 can be omitted,
Instead of the stirring device 46, a filler layer can be formed in the reaction tank 1.
【００２６】試験例１ 図１の装置により、次の条件で活性汚泥含有液にオゾン
含有ガスを吹込んでオゾン処理した。その結果、オゾン
含有ガスの空間速度が７ｈ-1のとき、ガス吸収率は９５
％であった。従って２ｍ3／ｈの汚泥含有液を処理する
ために必要な反応槽の容積は１０（Ｎｍ3／ｈ）÷７
（１／ｈ）＝１．４ｍ3となり、加圧を行わなかった後
述の比較例１に比べて反応槽の容積を約１／２にまで小
型化できることがわかる。Test Example 1 Using the apparatus shown in FIG. 1, ozone-containing gas was blown into the activated sludge-containing liquid under the following conditions for ozone treatment. As a result, when the space velocity of the ozone-containing gas is 7 h -1 , the gas absorption rate is 95
%Met. Therefore, the volume of the reaction tank required to treat the sludge-containing liquid of 2 m 3 / h is 10 (Nm 3 / h) / 7
(1 / h) = 1.4 m 3 , and it can be seen that the volume of the reaction tank can be reduced to about 1/2 as compared with Comparative Example 1 described below in which pressure is not applied.
【００２７】 汚泥含有液中の活性汚泥濃度：１０ｋｇ／ｍ3 汚泥含有液の流量：２ｍ3／ｈ オゾン濃度：４０ｇ／Ｎｍ3 オゾン含有ガスの流量：１０Ｎｍ3／ｈ オゾン含有ガスの線速度：１０ｍ／ｈ オゾン含有ガスの導入圧：１．０ｋｇｆ／ｃｍ2（ゲー
ジ圧） 槽内液のｐＨ：３Activated sludge concentration in sludge-containing liquid: 10 kg / m 3 Flow rate of sludge-containing liquid: 2 m 3 / h Ozone concentration: 40 g / Nm 3 Flow rate of ozone-containing gas: 10 Nm 3 / h Linear velocity of ozone-containing gas: 10 m / h Ozone-containing gas introduction pressure: 1.0 kgf / cm 2 (gauge pressure) pH of liquid in tank: 3
【００２８】試験例２ 試験例１と同様にして、ただしオゾン含有ガスの導入圧
を２．０ｋｇｆ／ｃｍ 2（ゲージ圧）に変更してオゾン
処理を行った。その結果、ガス吸収率９５％を得るため
のオゾン含有ガスの空間速度は１１ｈ-1であった。従っ
て２ｍ3／ｈの汚泥含有液を処理するために必要な反応
槽の容積は１０（Ｎｍ3／ｈ）÷１１（１／ｈ）＝０．
９ｍ3となり、比較例１に比べて反応槽の容積を約１／
３にまで小型化できることがわかる。Test Example 2 As in Test Example 1, except that the introduction pressure of the ozone-containing gas was changed.
2.0 kgf / cm 2Change to (gauge pressure) and ozone
Processed. As a result, to obtain a gas absorption rate of 95%
Space velocity of ozone-containing gas is 11h-1Met. Follow
2m3/ H required reaction to treat sludge-containing liquid
The volume of the tank is 10 (Nm3/ H) / 11 (1 / h) = 0.
9m3Therefore, the volume of the reaction tank is about 1 / compared with Comparative Example 1.
It can be seen that the size can be reduced to 3.
【００２９】比較例１ 試験例１において、反応槽内を加圧することなく大気開
放状態でオゾン処理した。その結果、ガス吸収率９５％
を得るために必要なオゾン含有ガスの空間速度は３ｈ-1
であった。従って２ｍ3／ｈの汚泥含有液を処理するた
めに必要な反応槽の容積は１０（Ｎｍ3／ｈ）÷３（１
／ｈ）＝３．３ｍ3であることがわかる。Comparative Example 1 In Test Example 1, ozone treatment was carried out in the atmosphere open without pressurizing the inside of the reaction tank. As a result, gas absorption rate is 95%
Required space velocity of ozone-containing gas is 3h -1
Met. Therefore, the volume of the reaction tank required to treat the sludge-containing liquid of 2 m 3 / h is 10 (Nm 3 / h) / 3 (1
It can be seen that /h)=3.3 m 3 .
【００３０】[0030]
【発明の効果】本発明の生物汚泥のオゾン処理装置で
は、反応槽内を所定の加圧状態に維持してオゾン処理す
るようにしているので、オゾンの濃度差を大きくしてオ
ゾン吸収効率を高くできるとともに、装置を小型化する
ことができ、これにより低コストで効率よく生物汚泥を
オゾン処理することが可能である。In the ozone treatment apparatus for biological sludge of the present invention, the ozone is treated by maintaining the inside of the reaction tank under a predetermined pressure, so that the difference in ozone concentration is increased to improve the ozone absorption efficiency. In addition to being able to increase the cost, the apparatus can be downsized, which enables efficient and ozone treatment of biological sludge at low cost.
【図１】実施例の生物汚泥のオゾン処理装置を示す系統
図である。FIG. 1 is a system diagram showing an ozone treatment apparatus for biological sludge according to an embodiment.
【図２】別の実施例の生物汚泥のオゾン処理装置を示す
系統図である。FIG. 2 is a system diagram showing an ozone treatment apparatus for biological sludge according to another embodiment.
【図３】別の実施例の生物汚泥のオゾン処理装置を示す
系統図である。FIG. 3 is a system diagram showing an ozone treatment apparatus for biological sludge according to another embodiment.
１ 反応槽 ２ 給液ポンプ ３ 汚泥含有液導入路 ４ 酸注入装置 ５ 酸注入路 ８ 散気装置 ９ オゾン発生機 １０ オゾン含有ガス導入路 １１ ドライヤ １２ コンプレッサ １３、１４ 連絡路 １７ 圧力検出装置 １８ 気液取出部 １９ 気液排出路 ２０、３６ 圧力調整弁 ２１ ｐＨ検出装置 ３１ 循環路 ３２ 循環ポンプ ３３ 気液吹出部 ３４ エジェクタ ３５ 圧力制御スイッチ ４１ 処理液取出部 ４２ 処理液取出路 ４３ 汚泥含有液導入装置 ４４ 減圧弁 ４５ 排オゾンガス路 ４６ 撹拌装置 DESCRIPTION OF SYMBOLS 1 Reaction tank 2 Liquid supply pump 3 Sludge-containing liquid introduction path 4 Acid injection device 5 Acid injection path 8 Diffuser 9 Ozone generator 10 Ozone-containing gas introduction path 11 Dryer 12 Compressor 13, 14 Communication path 17 Pressure detection device 18 Gas Liquid extraction section 19 Gas-liquid discharge path 20, 36 Pressure adjustment valve 21 pH detection device 31 Circulation path 32 Circulation pump 33 Gas-liquid blowing section 34 Ejector 35 Pressure control switch 41 Treated solution take-out section 42 Treated solution take-out channel 43 Sludge-containing solution introduction Device 44 Pressure reducing valve 45 Exhaust ozone gas path 46 Stirrer
【手続補正書】[Procedure amendment]
【提出日】平成７年２月３日[Submission date] February 3, 1995
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 FIG.
【図２】 [Fig. 2]
【図３】 [Figure 3]
Claims (1)
ｇｆ／ｃｍ2（ゲージ圧）の加圧状態でオゾン処理を行
う反応槽と、 この反応槽に生物汚泥含有液を加圧状態で導入する汚泥
導入手段と、 前記反応槽にオゾン含有ガスを加圧状態で導入するオゾ
ン導入手段と、 前記反応槽内を前記加圧状態に維持するようにオゾン処
理液および／または排オゾンガスを排出する圧力調整弁
とを備えていることを特徴とする生物汚泥のオゾン処理
装置。1. 0.5 to 3 k after receiving a biological sludge-containing liquid
A reaction tank for performing ozone treatment under a pressure of gf / cm 2 (gauge pressure), a sludge introducing means for introducing a biological sludge-containing liquid into the reaction tank under pressure, and an ozone-containing gas added to the reaction tank. Biological sludge characterized by comprising an ozone introducing means for introducing in a pressure state, and a pressure adjusting valve for discharging an ozone treatment liquid and / or exhaust ozone gas so as to maintain the inside of the reaction tank in the pressurized state. Ozone treatment equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00625095A JP3591023B2 (en) | 1995-01-19 | 1995-01-19 | Biological sludge ozonation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00625095A JP3591023B2 (en) | 1995-01-19 | 1995-01-19 | Biological sludge ozonation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08192196A true JPH08192196A (en) | 1996-07-30 |
| JP3591023B2 JP3591023B2 (en) | 2004-11-17 |
Family
ID=11633249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00625095A Expired - Fee Related JP3591023B2 (en) | 1995-01-19 | 1995-01-19 | Biological sludge ozonation equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3591023B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001191097A (en) * | 1999-10-25 | 2001-07-17 | Sumitomo Precision Prod Co Ltd | Wastewater treatment method |
| JP2003019497A (en) * | 2001-07-06 | 2003-01-21 | Sumitomo Precision Prod Co Ltd | Sludge treatment method and ejector |
| JP2005305441A (en) * | 1997-05-30 | 2005-11-04 | Mitsubishi Electric Corp | Waste water ozone treatment method and ozone treatment apparatus |
| KR100983129B1 (en) * | 2010-04-21 | 2010-09-20 | 김상묵 | A gas dissolution control method and device |
| WO2015166784A1 (en) * | 2014-04-29 | 2015-11-05 | 三菱電機株式会社 | Sludge treatment device and sludge treatment method |
| JP2023090048A (en) * | 2021-12-17 | 2023-06-29 | 三菱電機株式会社 | Sewage sludge treatment apparatus and treatment method |
-
1995
- 1995-01-19 JP JP00625095A patent/JP3591023B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005305441A (en) * | 1997-05-30 | 2005-11-04 | Mitsubishi Electric Corp | Waste water ozone treatment method and ozone treatment apparatus |
| JP2001191097A (en) * | 1999-10-25 | 2001-07-17 | Sumitomo Precision Prod Co Ltd | Wastewater treatment method |
| JP2003019497A (en) * | 2001-07-06 | 2003-01-21 | Sumitomo Precision Prod Co Ltd | Sludge treatment method and ejector |
| KR100983129B1 (en) * | 2010-04-21 | 2010-09-20 | 김상묵 | A gas dissolution control method and device |
| WO2011132895A3 (en) * | 2010-04-21 | 2012-03-01 | (주)이티씨아이엔씨 | Method and apparatus for gas dissolution |
| WO2015166784A1 (en) * | 2014-04-29 | 2015-11-05 | 三菱電機株式会社 | Sludge treatment device and sludge treatment method |
| JP5916971B2 (en) * | 2014-04-29 | 2016-05-11 | 三菱電機株式会社 | Sludge treatment apparatus and sludge treatment method |
| CN106103361A (en) * | 2014-04-29 | 2016-11-09 | 三菱电机株式会社 | Sludge treatment equipment and method for sludge treatment |
| US10259731B2 (en) | 2014-04-29 | 2019-04-16 | Mitsubishi Electric Corporation | Sludge treatment system and sludge treatment method |
| JP2023090048A (en) * | 2021-12-17 | 2023-06-29 | 三菱電機株式会社 | Sewage sludge treatment apparatus and treatment method |
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|---|---|
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