JPH06194296A - Measuring method for ozone bubble diameter of ozone contact tank - Google Patents
Measuring method for ozone bubble diameter of ozone contact tankInfo
- Publication number
- JPH06194296A JPH06194296A JP4345759A JP34575992A JPH06194296A JP H06194296 A JPH06194296 A JP H06194296A JP 4345759 A JP4345759 A JP 4345759A JP 34575992 A JP34575992 A JP 34575992A JP H06194296 A JPH06194296 A JP H06194296A
- Authority
- JP
- Japan
- Prior art keywords
- ozone
- contact tank
- bubbles
- gas
- bubble diameter
- 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
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 17
- 238000012546 transfer Methods 0.000 description 11
- 239000000701 coagulant Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000010191 image analysis Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は浄水場における凝集沈澱
工程を管理するためのフロック計測方法を利用して、オ
ゾン接触槽の設計上での指針となるオゾン気泡径を正確
に測定する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for accurately measuring the diameter of ozone bubbles, which is a guideline in designing an ozone contact tank, by using a floc measuring method for controlling the coagulation-sedimentation process in a water purification plant. It is a thing.
【０００２】[0002]
【従来の技術】近時高度浄水工程の一環としてオゾン接
触槽を利用した原水に対するオゾン処理が注目され、実
用化されている。このオゾン接触塔でのオゾン吸収特性
を評価する際に、該オゾン接触塔が散気式気泡塔のよう
に気泡の表面が気液接触面であると考えられる場合に
は、この気泡径を測定することがオゾン接触槽の設計及
び操作因子として極めて重要である。2. Description of the Related Art Recently, ozone treatment of raw water using an ozone contact tank has been noticed and put into practical use as a part of advanced water purification process. When evaluating the ozone absorption characteristics in this ozone contact tower, if the surface of the bubbles is considered to be a gas-liquid contact surface, as in the diffuser bubble tower, measure the bubble diameter. It is extremely important to design and operate the ozone contact tank.
【０００３】通常オゾン吸収特性の評価は総括オゾン移
動容量係数ＫＬａを用いて論議される。このＫＬａと
は、総括オゾン移動係数ＫＬと単位接触槽当たりの気液
接触面積ａとの積で表わされる。上記総括オゾン移動係
数ＫＬは、操作条件に影響を受けずに比較的一定の値を
示す物理量である。従って単位接触槽当たりの気液接触
面積ａが測定できれば、総括オゾン移動容量係数ＫＬａ
を演算で求めることが出来る。The evaluation of ozone absorption characteristics is usually discussed using the overall ozone transfer capacity coefficient KLa. This KLa is represented by the product of the overall ozone transfer coefficient KL and the gas-liquid contact area a per unit contact tank. The overall ozone transfer coefficient KL is a physical quantity that exhibits a relatively constant value without being affected by operating conditions. Therefore, if the gas-liquid contact area a per unit contact tank can be measured, the overall ozone transfer capacity coefficient KLa
Can be calculated.
【０００４】一方、通常の浄水場では、河川，湖沼から
取水した原水をフロック形成池で凝集剤（ポリ塩化カル
シウム，硫酸バント等）を添加して、懸濁物質成分（粘
土，藻類等）をフロックに凝集し、次段の沈澱池で除去
する方法が採られており、原水濁度と凝集剤注入率また
はＡＬＴ比（ＡＬ3+／濁度）との制御関係式を求めてフ
ロック形成制御を行っている。このようなフロック形成
制御はフィードフォワード制御系であるため、原水の濁
度の急激な変化などに対応しきれず、次段の濾過池が高
負荷になる惧れがあるので、フィードバック制御系を組
み込む態様も構築されている。On the other hand, in an ordinary water treatment plant, raw water taken from rivers and lakes is added with a flocculant (polycalcium chloride, vantosulfate, etc.) in a floc pond to add suspended substance components (clay, algae, etc.). The method of flocculation and removal in the next settling basin is adopted. Floc formation control is performed by obtaining the control relational expression between raw water turbidity and coagulant injection rate or ALT ratio (AL 3+ / turbidity) It is carried out. Since such floc formation control is a feed-forward control system, it cannot handle sudden changes in the turbidity of raw water, and there is a risk that the next-stage filtration tank will be overloaded, so a feedback control system will be incorporated. Aspects have also been constructed.
【０００５】上記に関して本出願人が先に提案した特願
平１−１９３６２９号には、図２に示した迂流式フロッ
ク計測装置例が開示されている。即ち、原水を着水井１
に取水し、混和池２にて凝集剤を注入する。そして迂流
式フロック形成池３において原水中の濁質成分をフロッ
クに凝集させる。その後に沈澱池４にてフロックを沈澱
させ、上澄液を図外のろ過池へ放流する。前記着水井１
には原水濁度を計測する濁度計５が付設されており、沈
澱池４には流出濁度を計測する濁度計６が付設されてい
る。この濁度計５，６によって計測された値は凝集剤注
入コントローラ７に入力されている。Regarding the above, Japanese Patent Application No. 1-193629 previously proposed by the present applicant discloses an example of the bypass type floc measuring device shown in FIG. That is, the raw water reaches the water well 1
The water is taken in and the coagulant is injected in the mixing pond 2. Then, the turbidity components in the raw water are aggregated into flocs in the bypass type floc formation pond 3. After that, flocs are settled in the settling tank 4, and the supernatant is discharged to a filter tank not shown. The landing well 1
Is attached with a turbidimeter 5 for measuring raw water turbidity, and the sedimentation basin 4 is attached with a turbidimeter 6 for measuring runoff turbidity. The values measured by the turbidimeters 5 and 6 are input to the coagulant injection controller 7.
【０００６】そしてフロック形成池３の最後段には、処
理水を撮影するための水中カメラ８が配備されており、
フロック計測装置９により水中カメラ８が撮影した画像
を処理してフロックを識別し、統計処理を行ってフロッ
クについての各種のデータを作成し、このデータを凝集
剤注入コントローラ７に出力する。At the last stage of the flock formation pond 3, an underwater camera 8 for photographing the treated water is provided.
An image captured by the underwater camera 8 is processed by the floc measuring device 9 to identify the floc, statistical processing is performed to create various data regarding the floc, and this data is output to the coagulant injection controller 7.
【０００７】凝集剤注入コントローラ７は、前記濁度計
５，６によって計測された原水及び流出水の濁度と、フ
ロック計測装置９から得られるデータに基づいて凝集剤
の注入量を算出し、混和池２への凝集剤の注入を制御す
る。この例では、フロックについての特徴量として、単
位容積当たりのフロック個数、フロック形成池後段の代
表フロックの平均粒径、単位容積当たりのフロック容量
及び単位容量当たりの微フロック容量を用いてこれを基
本的な指標とし、更に被処理水のｐＨとか取水量，返送
水量等の水質・運転情報を加味して混和池への凝集剤の
注入率制御を実施することが特徴となっている。The coagulant injection controller 7 calculates the coagulant injection amount based on the turbidity of the raw water and the outflow water measured by the turbidimeters 5 and 6 and the data obtained from the floc measuring device 9, The injection of the coagulant into the mixing pond 2 is controlled. In this example, the number of flocs per unit volume, the average particle size of the representative flocs in the latter stage of the flocculation pond, the floc capacity per unit volume, and the fine floc capacity per unit volume are used as the characteristic quantities for flocs. It is characterized by controlling the injection rate of the coagulant into the mixing pond by taking into consideration the pH of the water to be treated, water quality, and operational information such as the amount of returned water.
【０００８】[0008]
【発明が解決しようとする課題】上記したようにオゾン
接触槽のオゾン吸収特性の評価と、該オゾン接触槽の設
計及び操作因子としてオゾン気泡径を測定する手段が有
効であるが、上記した総括オゾン移動係数ＫＬの値は、
文献値と実測値での計算結果に大きな差が生じる場合が
多い。その原因として、装置構造とか気泡径の形状測定
が概略値である点が挙げられる。As described above, it is effective to evaluate the ozone absorption characteristics of the ozone contact tank and to measure the ozone bubble diameter as a designing and operating factor of the ozone contact tank. The value of the ozone transfer coefficient KL is
In many cases, there is a large difference between the calculated values of the literature values and the measured values. The reason is that the device structure and the bubble diameter shape measurement are approximate values.
【０００９】一般に知られている気泡径の測定方法は、
接触塔の外部から接写カメラとかビデオカメラによって
気泡を測定して、得られた写真から径長を求める手段が
採用されている。しかしこの方法では光の屈折率とかカ
メラの焦点深度等の因子により、気泡径を正確に計測す
ることができないという問題点があった。The generally known measuring method of bubble diameter is as follows:
A means for measuring bubbles from the outside of the contact tower with a close-up camera or a video camera and obtaining the diameter length from the obtained photograph is adopted. However, this method has a problem that the bubble diameter cannot be accurately measured due to factors such as the refractive index of light and the depth of focus of the camera.
【００１０】そこで本発明はこのような従来の気泡径の
測定方法が有している課題を解消して、オゾン吸収特性
の評価とオゾン接触槽の設計上での指針となるオゾン気
泡径を正確に測定する方法を提供することを目的とする
ものである。Therefore, the present invention solves the problems of the conventional bubble diameter measuring method, and accurately measures the ozone bubble diameter, which is a guideline for evaluation of ozone absorption characteristics and design of an ozone contact tank. The purpose is to provide a measuring method.
【００１１】[0011]
【課題を解決するための手段】本発明は上記の目的を達
成するために、原水をオゾン接触槽に取水して、該オゾ
ン接触槽の内方底部に配置された散気管からオゾンガス
を放散処理する一方、上記オゾン接触槽内に水中カメラ
を上下移動可能に配備して、数点の深度でオゾンガスの
気泡を撮影し、撮影された画像信号に基づいて画像計測
演算手段により、気泡についての各種特徴量を連続的に
出力するようにしたオゾン接触槽のオゾン気泡径測定方
法を提供する。前記オゾンガスの気泡についての特徴量
として、気泡個数（個数／ｌ）と幾何平均気泡径（ｍ
ｍ）を用いる。In order to achieve the above object, the present invention takes raw water into an ozone contact tank and diffuses ozone gas from an air diffuser arranged at the inner bottom of the ozone contact tank. On the other hand, an underwater camera is arranged in the ozone contact tank so as to be movable up and down, and bubbles of ozone gas are photographed at several depths, and various kinds of bubbles are photographed by the image measurement calculation means based on the photographed image signals. Provided is a method for measuring an ozone bubble diameter of an ozone contact tank, which is capable of continuously outputting a characteristic amount. The features of the ozone gas bubbles are the number of bubbles (number / l) and the geometric mean bubble diameter (m
m) is used.
【００１２】[0012]
【作用】かかるオゾン気泡径測定方法によれば、散気管
から放散されるオゾンガスの気泡を撮影する際に、水中
カメラをオゾン接触槽の最深測定位置に下げて、散気管
から放散された直後の気泡を撮影し、次に水中カメラを
所定距離だけ上方に引き上げ、次段の測定深度で停止さ
せて再び気泡を撮影する。この操作を繰り返すことによ
って数点の深度でオゾンガスの気泡が撮影され、この画
像信号が画像計測演算手段に送り込まれ、画像解析技術
を駆使し統計処理を行って気泡についての各種特徴量が
連続的に出力される。According to such an ozone bubble diameter measuring method, when photographing the bubbles of ozone gas emitted from the diffuser, the underwater camera is lowered to the deepest measurement position of the ozone contact tank, and immediately after being emitted from the diffuser. The bubble is photographed, then the underwater camera is pulled up by a predetermined distance, stopped at the next measurement depth, and the bubble is photographed again. By repeating this operation, bubbles of ozone gas are photographed at several depths, and this image signal is sent to the image measurement calculation means, and statistical processing is performed by making full use of image analysis technology to continuously obtain various feature amounts of bubbles. Is output to.
【００１３】得られた特徴量を管理指標としてオゾン接
触槽のオゾン吸収特性の評価が行われ、且つ該オゾン接
触槽の設計及び操作因子として用いることが出来る。The obtained characteristic amount can be used as a management index to evaluate the ozone absorption characteristics of the ozone contact tank, and can be used as a factor for designing and operating the ozone contact tank.
【００１４】[0014]
【実施例】以下、図１に基づいて本発明にかかるオゾン
接触槽のオゾン気泡径測定方法の一実施例を説明する。
即ち、本実施例では前記図２に示したフロック計測装置
の測定原理をオゾン接触槽に適用して、オゾンガスの気
泡径を測定することが特徴となっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ozone bubble diameter measuring method for an ozone contact tank according to the present invention will be described below with reference to FIG.
That is, the present embodiment is characterized in that the measurement principle of the flock measuring device shown in FIG. 2 is applied to the ozone contact tank to measure the bubble diameter of ozone gas.
【００１５】図１に示す１１はオゾン接触槽であり、こ
のオゾン接触槽内に原水１２が取水され、処理水１３と
して排水される。このオゾン接触槽１１の内方底部に
は、オゾン用の散気管１４が配置されていて、外部に配
備したオゾン発生機１５から得られるオゾンガスが散気
管１４に供給される。Reference numeral 11 shown in FIG. 1 is an ozone contact tank, and raw water 12 is taken into this ozone contact tank and discharged as treated water 13. An ozone diffusing tube 14 is arranged at the inner bottom of the ozone contact tank 11, and ozone gas obtained from an ozone generator 15 provided outside is supplied to the diffusing tube 14.
【００１６】１６はオゾン接触槽１１内に設置された洗
浄機構付の水中カメラであり、この水中カメラ１６に
は、照明用の光源ボックス１７が連結されている。上記
水中カメラ１６は、矢印Ａで示したようにオゾン接触槽
１１の内方で上下移動自在となっている。又、オゾンガ
スの気泡を完全静止画像として捕らえるために電子シャ
ッターモードで完全インターレス方式のカメラを使用す
る。Reference numeral 16 denotes an underwater camera with a cleaning mechanism installed in the ozone contact tank 11, and the underwater camera 16 is connected to a light source box 17 for illumination. The underwater camera 16 is vertically movable inside the ozone contact tank 11 as shown by an arrow A. Also, in order to capture the bubbles of ozone gas as a completely still image, a completely interlaced camera is used in the electronic shutter mode.
【００１７】１８は中継制御盤、１９は画像計測演算手
段であり、この画像計測演算手段１９は水中カメラ１６
によって撮影された画像を演算処理してオゾン気泡径に
関する特徴量２０を出力する。Reference numeral 18 is a relay control panel, and 19 is an image measuring / calculating means. The image measuring / calculating means 19 is an underwater camera 16.
The image captured by is subjected to arithmetic processing and the feature amount 20 regarding the ozone bubble diameter is output.
【００１８】かかる構成による本実施例の基本的動作は
以下の通りである。先ず、原水１２をオゾン接触槽１１
内に取水し、次にオゾン発生機１５を起動して散気管１
４からオゾンガスの気泡２１を原水中に放散する。The basic operation of this embodiment having such a configuration is as follows. First, the raw water 12 is added to the ozone contact tank 11
Water is taken in, and then the ozone generator 15 is activated to start the air diffuser 1
Bubbles 21 of ozone gas are diffused from 4 into the raw water.
【００１９】この気泡２１を撮影するに際して、先ず水
中カメラ１６をオゾン接触槽１１の最深測定位置まで下
げて、光源ボックス１７による照明下で散気管１４から
放散された直後の気泡２１を撮影する。次に水中カメラ
１６を所定距離だけ上方に引き上げ、次段の測定深度で
停止させて再び気泡２１を撮影する。When photographing the bubble 21, first, the underwater camera 16 is lowered to the deepest measurement position of the ozone contact tank 11 and the bubble 21 immediately after being diffused from the air diffuser 14 under the illumination of the light source box 17 is photographed. Next, the underwater camera 16 is pulled upward by a predetermined distance, stopped at the next measurement depth, and the bubble 21 is photographed again.
【００２０】以後同様な操作を繰り返して、数点の深度
で気泡２１を撮影する。撮影された画像信号は中継制御
盤１８を経由して画像計測演算手段１９に送り込まれ
る。この画像計測演算手段１９は、詳細は後述するよう
に得られた気泡２１の画像から画像解析技術を駆使し統
計処理を行って気泡２１についての各種特徴量を連続的
に算出する。尚、気泡２１についての特徴量の１例とし
て、気泡個数（個数／ｌ）と幾何平均気泡径（ｍｍ）を
挙げることができる。Thereafter, the same operation is repeated to photograph the bubble 21 at several depths. The captured image signal is sent to the image measurement calculation means 19 via the relay control panel 18. The image measurement calculation means 19 continuously calculates various characteristic amounts of the bubble 21 by performing statistical processing using an image analysis technique from an image of the bubble 21 obtained as described later in detail. As an example of the characteristic amount of the bubble 21, the number of bubbles (number / l) and the geometric mean bubble diameter (mm) can be mentioned.
【００２１】水中カメラ１６をオゾン接触槽１１の最深
測定位置から順次上方に引き上げながら数点の深度で気
泡２１を撮影する理由は、オゾン接触槽１１が深槽であ
る場合に底部近傍での気泡２１の径と、中間部及び液面
近傍での気泡２１の径の大きさに差異が生じるためであ
る。本実施例では、この差異を補正等の手段によって相
殺することが可能であり、気泡径に関するデータの信頼
性を高めることができる。The reason why the bubbles 21 are photographed at several depths while sequentially raising the underwater camera 16 from the deepest measurement position of the ozone contact tank 11 is that the bubbles near the bottom of the ozone contact tank 11 are deep. This is because there is a difference between the diameter of the bubble 21 and the size of the bubble 21 in the middle portion and near the liquid surface. In this embodiment, this difference can be offset by means of correction or the like, and the reliability of the data regarding the bubble diameter can be increased.
【００２２】気泡２１の１回の測定時間は、該気泡２１
の特徴量２０が安定するまで実施する。例えば１０画面
以上の撮影を継続して気泡の特徴量２０の出力が安定し
た時点で次段の撮影位置に移行する。The time required for one measurement of the bubble 21 is
It is carried out until the feature amount 20 of is stable. For example, when shooting of 10 or more screens is continued and the output of the bubble feature amount 20 is stabilized, the shooting position shifts to the next shooting position.
【００２３】尚、上記気泡２１の径を常時又は定期的に
監視すれば、散気管１４に目詰まりとか劣化が生じた場
合に、該気泡２１の径が変化するので、直ちにこのよう
な故障要因を検知することが出来る。If the diameter of the bubble 21 is constantly or regularly monitored, the diameter of the bubble 21 changes when the diffuser pipe 14 is clogged or deteriorates. Can be detected.
【００２４】以下に本実施例における理論的根拠を説明
する。前記したようにオゾン接触槽の設計及び操作因子
として、オゾン気泡径を利用する手段が有効であり、特
にオゾン吸収特性の評価は、総括オゾン移動容量係数Ｋ
Ｌａを用いて論議される。このＫＬａとは総括オゾン移
動係数ＫＬと単位接触槽当たりの気液接触面積ａとの積
で表わされる。総括オゾン移動係数ＫＬは操作条件に影
響を受けずに比較的一定の値を示す物理量である。The theoretical basis of this embodiment will be described below. As described above, as a designing and operating factor of the ozone contact tank, a means utilizing the ozone bubble diameter is effective, and in particular, the evaluation of the ozone absorption characteristics is performed by the overall ozone transfer capacity coefficient K.
It will be discussed using La. This KLa is represented by the product of the overall ozone transfer coefficient KL and the gas-liquid contact area a per unit contact tank. The overall ozone transfer coefficient KL is a physical quantity that exhibits a relatively constant value without being affected by operating conditions.
【００２５】前記オゾン接触槽１１のように散気式気泡
塔の場合には、気泡２１の表面が気液接触面であると考
えられ、従って単位接触槽当たりの気液接触面積ａは計
算することが出来る。In the case of the diffuser type bubble column like the ozone contact tank 11, the surface of the bubble 21 is considered to be the gas-liquid contact surface, and therefore the gas-liquid contact area a per unit contact tank is calculated. You can
【００２６】気液接触面積ａの計算方法は以下の通りで
ある。The method of calculating the gas-liquid contact area a is as follows.
【００２７】ａ＝φ・Ｓｂ／Ｖｂ ここでφ（ホールドアップ）：単位接触容積当たりに占
める気体体積 Ｓｂ：１個の気泡の表面積 Ｖｂ：１個の気泡の体面積 φ／Ｖｂにより単位接触槽当たりの気泡数を計算して、
これに１個の気泡の表面積を掛けることによって気液接
触面積ａを求めることが出来る。A = φ · Sb / Vb where φ (hold-up): gas volume occupied per unit contact volume Sb: surface area of one bubble Vb: body area of one bubble φ / Vb unit contact tank Calculate the number of bubbles per hit,
The gas-liquid contact area a can be obtained by multiplying this by the surface area of one bubble.
【００２８】上記のφ（ホールドアップ）は、オゾンガ
スの送気による液面の上昇率ｈ，即ち、オゾンガス送気
後の液面高さに対する送気前の液面高さの率により、次
式によって求めることが出来る。The above φ (hold-up) is expressed by the following equation by the rising rate h of the liquid surface due to the air supply of ozone gas, that is, the ratio of the liquid level height before the air supply to the liquid surface height after the ozone gas is sent. Can be obtained by
【００２９】φ＝ｈ／（１−ｈ） この液面の上昇率ｈは、オゾン接触槽１１の水位におい
て、 ｈ＝（Ｌ１−Ｌ２） ここでＬ１：オゾンガス送気後の水位高さ、Ｌ２：同送
気前の水位高さである。そこでφをＬ１，Ｌ２で表わす
と、 φ＝（Ｌ１−Ｌ２）／Ｌ２ となる。Φ = h / (1−h) The rate of rise of the liquid level, h, at the water level in the ozone contact tank 11 is: h = (L1−L2) where L1: water level height after ozone gas is fed, L2 : It is the height of the water level before the air supply. Therefore, when φ is represented by L1 and L2, φ = (L1−L2) / L2.
【００３０】気泡２１の形状が球形である場合には、そ
の直径をｄとすると、 Ｖｂ＝（４／３）・π・（ｄ／２）3 Ｓｂ＝４・π・（ｄ／２）2 で示されるので、 ａ＝（６／ｄ）・φ ここでφ：ｍ2／ｍ3， ｄ：ｍ となる。When the shape of the bubble 21 is spherical, and its diameter is d, Vb = (4/3) · π · (d / 2) 3 Sb = 4 · π · (d / 2) 2 Therefore, a = (6 / d) · φ, where φ: m 2 / m 3 and d: m.
【００３１】そこでオゾンの気泡径を測定して上記φを
求めておけば、ＫＬａの値から総括オゾン移動係数ＫＬ
の値を算出することが可能となる。Therefore, if the bubble diameter of ozone is measured to find the above φ, the overall ozone transfer coefficient KL can be calculated from the value of KLa.
It is possible to calculate the value of.
【００３２】以上の説明では総括オゾン移動係数ＫＬと
気液接触面積ａについて述べたが、総括オゾン移動容量
係数ＫＬａの値を大きくしてオゾンの水への移動速度を
高くするためには、気液接触面積ａの値を大きくするこ
とが効果的であり、そのためにはオゾンガスの送気量を
高めてφの値を大きくするか、散気管１４として径の小
さな気泡２１を散気することがより効果的となる。In the above description, the general ozone transfer coefficient KL and the gas-liquid contact area a have been described. However, in order to increase the value of the general ozone transfer capacity coefficient KLa to increase the moving speed of ozone to water, It is effective to increase the value of the liquid contact area a, and for that purpose, the amount of ozone gas fed is increased to increase the value of φ or the air diffuser 14 diffuses the small-diameter bubbles 21. It will be more effective.
【００３３】[0033]
【発明の効果】以上説明したように、本発明に係るオゾ
ン接触槽のオゾン気泡径測定方法によれば、水中カメラ
によってオゾン接触槽内の気泡を直接撮影しているた
め、外部から接写カメラとかビデオカメラによって気泡
を測定した場合に比較して、光の屈折率とかカメラの焦
点深度等の基づく不正確な要因が取り除かれて、気泡径
を正確に計測することができるとともに、気泡の撮影時
に水中カメラをオゾン接触槽の最深測定位置から順次上
方に引上げながら数点の深度でオゾンガスの気泡を撮影
しているので、特にオゾン接触槽が深槽である場合に底
部近傍での気泡の径と、中間部及び液面近傍での気泡の
径の大きさに差異があっても、この差異が補正等の手段
によって相殺されて、データの信頼性を高めることがで
きる。As described above, according to the method for measuring the ozone bubble diameter of the ozone contact tank according to the present invention, since the bubbles in the ozone contact tank are directly photographed by the underwater camera, it is possible to use a close-up camera from the outside. Compared to the case of measuring bubbles with a video camera, inaccurate factors such as the refractive index of light and the depth of focus of the camera are removed, and the bubble diameter can be measured accurately, and at the time of shooting the bubble. Bubbles of ozone gas are taken at several depths while pulling the underwater camera sequentially upward from the deepest measurement position of the ozone contact tank, so when the ozone contact tank is a deep tank, the diameter of the bubbles near the bottom and Even if there is a difference in the size of the bubble diameter in the middle portion and in the vicinity of the liquid surface, this difference is offset by means such as correction, and the reliability of the data can be improved.
【００３４】そして画像計測演算手段から得られる気泡
についての特徴量を管理指標としてオゾン接触槽のオゾ
ン吸収特性の評価を行い、且つ該オゾン接触槽の設計及
び操作因子として用いることが出来る。Then, the ozone absorption characteristics of the ozone contact tank can be evaluated by using the characteristic amount of the bubbles obtained from the image measuring and calculating means as a management index, and can be used as a designing and operating factor of the ozone contact tank.
【００３５】又、本発明によれば、オゾンガスの気泡径
を常時又は定期的に監視することにより、オゾンガスを
液中に放散する散気管の目詰まりとか劣化を素早く検知
することができて、直ちに交換等の対策を講ずることが
可能であるという付随的な効果が得られる。Further, according to the present invention, by constantly or periodically monitoring the bubble diameter of ozone gas, it is possible to quickly detect clogging or deterioration of the diffuser pipe that diffuses ozone gas into the liquid, and immediately. There is an additional effect that it is possible to take measures such as replacement.
【図１】本発明にかかるオゾン気泡径測定方法の一実施
例を説明するための概要図。FIG. 1 is a schematic diagram for explaining an embodiment of an ozone bubble diameter measuring method according to the present invention.
【図２】従来の迂流式フロック計測装置例を示す概要
図。FIG. 2 is a schematic view showing an example of a conventional bypass type floc measuring device.
１１…オゾン接触槽 １２…原水 １３…処理水 １４…散気管 １５…オゾン発生機 １６…水中カメラ １７…光源ボックス １８…中継制御盤 １９…画像計測演算手段 ２０…特徴量 ２１…気泡 11 ... Ozone contact tank 12 ... Raw water 13 ... Treated water 14 ... Diffuser tube 15 ... Ozone generator 16 ... Underwater camera 17 ... Light source box 18 ... Relay control panel 19 ... Image measurement calculation means 20 ... Characteristic amount 21 ... Bubbles
Claims (2)
ン接触槽の内方底部に配置された散気管からオゾンガス
を放散処理する一方、上記オゾン接触槽内に水中カメラ
を上下移動可能に配備して、数点の深度でオゾンガスの
気泡を撮影し、撮影された画像信号に基づいて画像計測
演算手段により、気泡についての各種特徴量を連続的に
出力するようにしたことを特徴とするオゾン接触槽のオ
ゾン気泡径測定方法。1. A raw water is taken into an ozone contact tank, and ozone gas is diffused from an air diffuser arranged at the inner bottom of the ozone contact tank, while an underwater camera can be moved up and down in the ozone contact tank. It is characterized in that it is arranged so that bubbles of ozone gas are photographed at several depths, and various characteristic amounts of bubbles are continuously output by the image measurement calculation means based on the photographed image signals. Method for measuring ozone bubble diameter in ozone contact tank.
は、気泡個数（個数／ｌ）と幾何平均気泡径（ｍｍ）で
ある請求項１記載のオゾン接触槽のオゾン気泡径測定方
法。2. The ozone bubble diameter measuring method for an ozone contact tank according to claim 1, wherein the feature quantities of the bubbles of ozone gas are the number of bubbles (number / l) and the geometric mean bubble diameter (mm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4345759A JPH06194296A (en) | 1992-12-25 | 1992-12-25 | Measuring method for ozone bubble diameter of ozone contact tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4345759A JPH06194296A (en) | 1992-12-25 | 1992-12-25 | Measuring method for ozone bubble diameter of ozone contact tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06194296A true JPH06194296A (en) | 1994-07-15 |
Family
ID=18378784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4345759A Pending JPH06194296A (en) | 1992-12-25 | 1992-12-25 | Measuring method for ozone bubble diameter of ozone contact tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06194296A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007030105A1 (en) * | 2007-06-28 | 2009-01-02 | Air Liquide Deutschland Gmbh | Process for the treatment of water |
| JP2009072684A (en) * | 2007-09-20 | 2009-04-09 | Kobelco Eco-Solutions Co Ltd | Diffused air evaluation method |
| JP2010038711A (en) * | 2008-08-05 | 2010-02-18 | Ihi Corp | Granule substance measurement method |
| CN105158124A (en) * | 2015-10-10 | 2015-12-16 | 山东省科学院海洋仪器仪表研究所 | Bubble image in-situ collection device |
| KR102414865B1 (en) * | 2021-10-13 | 2022-06-29 | 한국수력원자력 주식회사 | Method for predicting bubble sizes in a pool using venturi-scrubbing |
| CN115417492A (en) * | 2022-08-30 | 2022-12-02 | 同济大学建筑设计研究院(集团)有限公司 | Advanced oxidation system based on underwater vision and control method |
-
1992
- 1992-12-25 JP JP4345759A patent/JPH06194296A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007030105A1 (en) * | 2007-06-28 | 2009-01-02 | Air Liquide Deutschland Gmbh | Process for the treatment of water |
| JP2009072684A (en) * | 2007-09-20 | 2009-04-09 | Kobelco Eco-Solutions Co Ltd | Diffused air evaluation method |
| JP2010038711A (en) * | 2008-08-05 | 2010-02-18 | Ihi Corp | Granule substance measurement method |
| CN105158124A (en) * | 2015-10-10 | 2015-12-16 | 山东省科学院海洋仪器仪表研究所 | Bubble image in-situ collection device |
| KR102414865B1 (en) * | 2021-10-13 | 2022-06-29 | 한국수력원자력 주식회사 | Method for predicting bubble sizes in a pool using venturi-scrubbing |
| CN115417492A (en) * | 2022-08-30 | 2022-12-02 | 同济大学建筑设计研究院(集团)有限公司 | Advanced oxidation system based on underwater vision and control method |
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