JPS5858189A - Adjusting means for ph - Google Patents

Adjusting means for ph

Info

Publication number
JPS5858189A
JPS5858189A JP15671581A JP15671581A JPS5858189A JP S5858189 A JPS5858189 A JP S5858189A JP 15671581 A JP15671581 A JP 15671581A JP 15671581 A JP15671581 A JP 15671581A JP S5858189 A JPS5858189 A JP S5858189A
Authority
JP
Japan
Prior art keywords
wastewater
flow rate
waste water
amount
adjusting
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
Application number
JP15671581A
Other languages
Japanese (ja)
Inventor
Akishiro Sakai
酒井 昭四郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
Original Assignee
Kurita Water Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to JP15671581A priority Critical patent/JPS5858189A/en
Publication of JPS5858189A publication Critical patent/JPS5858189A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To automatically control the pH of waste water without regard to the presence of variation in a load and to enable to perform rapid and accurate pH- adjustment even for waste water having a large buffering index, by combining feed-forward control and feed-back control. CONSTITUTION:Waste water 4 is introduced through a flow rate-measuring sampler 6 into a pH-adjusting cell 1 and reserved therein. The flow rate of the waste water 4 is measured by said sampler 6, sampled in proportion to the flow rate and reserved in a test vessel 8 of small capacity. A pump 14 is then driven in fixed time intervals by a timer 20, a rapid reactive pH-adjusting agent (e.g. NaOH, HCl) is poured from a tank 12 for the chemical agent into the vessel 8, and an amount of the pH-adjusting agent necessary for making pH to a fixed value of from objective pH (pH7 in general) to approximately 1-3pH. On this occasion, the pH of the reactive liquid in the vessel 8 is measured by a pH electrode 10, a pH signal is A/D-converted by an A/D converter 21, and the reactive liquid is let flow into the pH-adjusting cell 1 when the signal reaches a preset value by stopping the pump 14 and opening an electromagnetic motor 9 by a controller 22.

Description

【発明の詳細な説明】 この発明は排水のpH調節装置、特にメッキ排水のよう
に、間欠的に排出される排水を中和処理するのに適した
pH調節装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pH control device for wastewater, and particularly to a pH control device suitable for neutralizing intermittently discharged wastewater such as plating wastewater.

一般に排水のpH調節のためのpH調節剤の注入には、
流出側に検出器としてpH電極を設置し、これより得ら
れた信号によりpH調節器を介して、流入側に設けられ
た調節剤注入調節弁を制御するような態様の自動制御方
式のものが用いられているが。
In general, injection of pH adjuster to adjust the pH of wastewater requires the following steps:
There is an automatic control system in which a pH electrode is installed as a detector on the outflow side, and the signal obtained from this is used to control the regulator injection control valve provided on the inflow side via a pH controller. Although it is used.

この方式では排水の負荷変動が犬になればpHの1呻制
御は困難になり、とくに緩衝指数の大きな系で負荷変動
があれば正確な制御は不可能となる。
In this method, if the load of the wastewater fluctuates rapidly, it becomes difficult to control the pH by one degree, and especially in a system with a large buffer index, if the load fluctuates, accurate control becomes impossible.

メッキ工場などから排出される排水は量の変動とともに
質の変動があり、これを前述のような方式で中和処理す
ることにできない。
The wastewater discharged from plating factories and the like varies in quality as well as quantity, and it is not possible to neutralize it using the method described above.

このような点を改善するために採用されたものとして、
従来、カヌケード制御方式、直列多段に調節槽を設けた
多段制御方式、あるいは/2イパス流へ濃厚調節液を添
加して適尚なpi(K調節し、これを本流に合体させて
目標pHに調節する二段制御方式などがあるが、いずれ
も複雑な装置および操作を必要とする割には迅速かつ正
確なpH調節が困難であった。
In order to improve these points, the following
Conventionally, the canucade control system, the multi-stage control system with adjustment tanks installed in multiple stages in series, or the addition of a concentrated adjustment liquid to the /2 Ipass flow to adjust the appropriate pi (K), and then combining this with the main flow to reach the target pH. There are two-stage control systems for adjusting pH, but all of them require complicated equipment and operations, making it difficult to adjust pH quickly and accurately.

この発明は以上のような従来のものの欠点を改善するた
めのもので、フィードフォワード制御とフィードバック
制御とを組合せることにより、負荷変動の激しい排水に
対しても、簡単な装置により、迅速かつ正確に自動制御
可能なpH調節装置を提供することを目的としている。
This invention is intended to improve the above-mentioned drawbacks of the conventional methods. By combining feedforward control and feedback control, even drainage with large load fluctuations can be handled quickly and accurately using a simple device. The purpose of this invention is to provide a pH adjustment device that can be automatically controlled.

この発明は排水を受は入れてpH調節を行うpH調節槽
と、前記排水をサンプリングし、pH調節剤を注入する
試験容器と、この試験容器および前記−調節槽への排水
の流入量ならびに試験容器へのpHより前の所定pH値
にするのに必要なpH調節剤量を演算する演算装置と、
演算された量のpH調節剤をpH調節槽に注入するとと
もに、排水のpHが目標pHになるまでのpH調節剤の
不足分を制御しながら注入する装置を備えたpH調節装
置である。
This invention provides a pH adjustment tank that receives wastewater and adjusts the pH, a test container that samples the wastewater and injects a pH adjuster, and the amount of inflow of the wastewater into the test container and the adjustment tank, as well as tests. a calculation device that calculates the amount of pH adjuster necessary to bring the pH to a predetermined value before the pH in the container;
This pH adjusting device is equipped with a device that injects a calculated amount of pH adjusting agent into a pH adjusting tank while controlling the amount of pH adjusting agent that is insufficient until the pH of the wastewater reaches a target pH.

本発明では目標pHより前の所定pHにするためのpH
調節剤量を演算することによりフィードフォワード制御
を行い、これにより大ざっばな調整を行ったのち、排水
のpH値を測定してフィードバック制御により目標pH
値まで微調整を行い、迅速かつ正確VC餠調節を行うも
のである。
In the present invention, the pH is adjusted to a predetermined pH before the target pH.
Feedforward control is performed by calculating the amount of regulating agent, and after making rough adjustments, the pH value of the wastewater is measured and the target pH is adjusted by feedback control.
This allows for quick and accurate VC adjustment.

以下1図面により本発明を説明する。図面は実施例のp
H調節装置を示す系統図である。図面において、1はp
H調節槽であって、pH電極2および攪拌器6を備え、
排水流入管4および流出管5が連絡している。排水流入
管4には流量計測サンプラー6が設けられており、これ
からバイパス管7が分岐し、排水流入管4VC連絡して
いる。
The present invention will be explained below with reference to one drawing. The drawings are p.
It is a system diagram showing an H adjustment device. In the drawing, 1 is p
H adjustment tank, comprising a pH electrode 2 and a stirrer 6,
A wastewater inflow pipe 4 and an outflow pipe 5 are in communication. The wastewater inflow pipe 4 is provided with a flow measurement sampler 6, from which a bypass pipe 7 branches off and communicates with the wastewater inflow pipe 4VC.

・2イパス管7には試験容器8および電磁弁9が設けら
れている。試験容器8はpH電極1oおよび攪拌器11
を備え、薬剤槽12がら薬注管16がポンプ14を介し
て連絡している。pH調節槽1には別の薬剤槽15がら
、薬注管16がポンプ17゜コントロール弁18.流量
計19を介して連絡している。
- The 2-pass tube 7 is provided with a test container 8 and a solenoid valve 9. The test container 8 has a pH electrode 1o and a stirrer 11.
A drug injection pipe 16 is connected to the drug tank 12 via a pump 14. The pH adjustment tank 1 has a separate medicine tank 15, a medicine injection pipe 16, a pump 17° control valve 18. Communication is made via a flow meter 19.

20はタイマーであって、ポンプ14を始動するように
接続されている。pH電極1oは試験容器8内のpHを
測定し、その信号はA/D変換器21を介してコントロ
ーラ22に与えられ、所定pH値となったときにポンプ
14を停止するとメもに電磁弁9を開閉するように接続
されている。ポンプ14の送液量信号(例えば時間信号
’)flA/D変換器26を介して演算装置24に送ら
れるように接続されている。
A timer 20 is connected to start the pump 14. The pH electrode 1o measures the pH inside the test container 8, and the signal is given to the controller 22 via the A/D converter 21, and when the pump 14 is stopped when a predetermined pH value is reached, a solenoid valve is activated. 9 is connected to open and close. A liquid feed amount signal (for example, a time signal') of the pump 14 is connected to be sent to the arithmetic unit 24 via the fl A/D converter 26 .

流量計測サンプラー6は流量計と流量比例式す分流させ
、流量信号はA/D変換器25を介して演算装置24に
送られるように接続されている。
The flow rate measuring sampler 6 is connected to a flow meter so that the flow rate is proportional to the flow rate, and the flow rate signal is sent to the arithmetic unit 24 via the A/D converter 25.

演算装置24はA/D変換器23 +、−25からの信
号よりpH調節槽1の排水、を所定pH値にするための
pH調節剤添加量を演算し、コントローラ26に指示信
号を送るように接続され°ている。
The calculation device 24 calculates the amount of pH adjuster to be added to bring the wastewater of the pH adjustment tank 1 to a predetermined pH value based on the signals from the A/D converters 23 + and -25, and sends an instruction signal to the controller 26. ° connected to.

コントローラ26il−jこの指示信号によりポンプ1
7を発停するとともに、D’/A変換器27を介してコ
ントロール弁18の開度を調節するように接続されてい
る。捷たコントローラ26はp11電極2のpH信号が
A /、 D変換器28を介して与えられ。
The controller 26il-j controls the pump 1 by this instruction signal.
The control valve 18 is connected to start and stop the control valve 7 and to adjust the opening degree of the control valve 18 via the D'/A converter 27. The switched controller 26 receives the pH signal of the p11 electrode 2 via an A/D converter 28.

とのpH値が目標pH値5になるようにポンプ17を発
停し、コントロール弁18の開度を調節するように接続
されている。流量計19の流量信号はA/D変換器29
を介してコントローラ26に与えられるように接続され
ている。
The pump 17 is turned on and off so that the pH value becomes the target pH value 5, and the opening degree of the control valve 18 is adjusted. The flow rate signal of the flow meter 19 is sent to the A/D converter 29.
The signal is connected to the controller 26 via the .

以上のように構成されたpH調節装置において、排水は
排水流入管4から流量計測サンプラー6を通ってpH調
節槽1に流入し貯留される。この排水は1例えばメッキ
排水の場合、連続的でなく、また流入しているときでも
流量および水質tfi’一定ではない。pH調節槽1の
容量は特に限定はなく一定時間(例えば1時間)の排水
を貯留できる容量とする。
In the pH control device configured as described above, waste water flows from the waste water inflow pipe 4 through the flow rate measurement sampler 6 into the pH control tank 1 and is stored therein. This drainage, for example in the case of plating drainage, is not continuous, and even when it is flowing in, the flow rate and water quality tfi' are not constant. The capacity of the pH adjustment tank 1 is not particularly limited, and is set to a capacity that can store wastewater for a certain period of time (for example, one hour).

、排水は流量計測サンプラー6において流量測定され、
流量に比例してサンプリングされ、小容量(05〜11
)の試験容器8に貯留される。このとき流量に比例して
サンプリングされるので、pH調節槽1と試験容器8の
排水の水質はほぼ同じとなり、その容量比はサンプリン
グの容量比と同じとなる。
, the flow rate of the wastewater is measured in a flow rate measurement sampler 6,
Sampled proportionally to flow rate, small volume (05-11
) is stored in the test container 8. At this time, since sampling is performed in proportion to the flow rate, the water quality of the waste water in the pH adjustment tank 1 and the test container 8 is almost the same, and the volumetric ratio thereof is the same as the sampling volume ratio.

こうしてpH調節槽1および試験容器8に排水が貯留さ
れたところで、排水の流量およびpH調節槽1の容量に
より異々るが、一定時間(pH調節槽1姥おける平均滞
留時間 例えば1時間)毎に、タイ−マー20によりポ
ン−/′14が始動し、薬剤槽12から薬注管13を通
して試験容器8に反応性の速いpH調節剤(アルカリ剤
であれば水酸化ナトリウム溶液、酸であれば塩酸など)
が注入され、目標pH値(通常はpH7)より1〜3 
pH程度前の所定pH値にするのに必要なpH調節剤の
量n’: ill定される。
Once the wastewater has been stored in the pH adjustment tank 1 and the test container 8, it may vary depending on the flow rate of the wastewater and the capacity of the pH adjustment tank 1. Then, the pump 14 is started by the timer 20, and a highly reactive pH adjusting agent (sodium hydroxide solution for alkaline agents, sodium hydroxide solution for acids, hydrochloric acid, etc.)
is injected at a pH of 1 to 3 below the target pH value (usually pH 7).
The amount n' of the pH adjuster required to reach a predetermined pH value about pH 100 is determined.

この間攪拌器11を駆動しながら反応が行われ。During this time, the reaction was carried out while driving the stirrer 11.

変換器21でA/D変換され、設定値に達したところで
コントローラ22によりボン−7′′14が停止すると
ともに、電磁弁9が而いて反応液”B ’pH調節槽1
に流出する。
A/D conversion is performed by the converter 21, and when the set value is reached, the controller 22 stops the bomb 7''14, and the solenoid valve 9 is turned on, and the reaction liquid "B'" pH adjustment tank 1 is turned off by the controller 22.
leaks to.

流量計測サンプラー゛6およびポンプ14の流量信号は
演算装置24に入力され1次式によりpH調節槽1の排
水について、目標pH値より1〜3 pH前の所定pH
値にするのに必要なpH調節剤量が演算される。
The flow rate signals from the flow measurement sampler 6 and the pump 14 are input to the arithmetic unit 24, and a linear equation is used to determine the predetermined pH of the wastewater from the pH adjustment tank 1, which is 1 to 3 pH before the target pH value.
The amount of pH adjuster required to achieve the desired value is calculated.

式中、AはpH調節槽1のpH調節剤注入量、Kは排水
の種類により決まる定数、■は試料採取時間内の排水全
容量、■は採取した試料の容量、a[採取した試料をp
H調節するのに要した薬剤量、bは一調節槽1に注入す
るpH調節剤の当量数である。
In the formula, A is the amount of pH adjuster injected into pH adjustment tank 1, K is a constant determined by the type of wastewater, ■ is the total volume of wastewater within the sample collection time, ■ is the volume of the sample collected, a [the amount of sample collected] p
The amount of chemicals required to adjust the pH value, b, is the number of equivalents of the pH adjuster injected into one adjustment tank 1.

演算結果はフィードフォワード信号としてコントローラ
261/i:与えられ、この信号により°コントローラ
26はポンプ17を始動させ、Aに対応する量のpl−
1調節剤(アルカリ剤であれば消石灰、酸であれば硫酸
など)が薬剤槽15から薬注管16を通してpH調節槽
1に注入される。この間流量計19の流量信号によりコ
ントロール弁18の開度は所定開度に維持される。この
操作はAに対応する薬剤量の注入が完了するまで行われ
る。
The calculation result is given to the controller 261/i as a feedforward signal, and this signal causes the controller 26 to start the pump 17 and pump the amount of pl- corresponding to A.
1 regulator (slaked lime if it is an alkaline agent, sulfuric acid if it is an acid, etc.) is injected from the chemical tank 15 into the pH adjusting tank 1 through the chemical injection pipe 16. During this time, the opening degree of the control valve 18 is maintained at a predetermined opening degree by the flow rate signal from the flow meter 19. This operation is continued until the injection of the drug amount corresponding to A is completed.

pH調節槽1では攪拌器乙の駆動により反応が進行し、
目標pH値の1〜ろpH前の所定pH値まで調節される
。この状態でpH電極2でpH調節槽1の排水のpHを
検出し、そのpH信号がA/D変換してフィートノにツ
ク信号としてコントローラ26に与えられ、フィードバ
ック制御によるpH調節が行われる。
In the pH adjustment tank 1, the reaction progresses by driving the stirrer B.
The pH value is adjusted from 1 to a predetermined pH value before the target pH value. In this state, the pH of the waste water in the pH adjustment tank 1 is detected by the pH electrode 2, and the pH signal is A/D converted and given to the controller 26 as a feed signal to perform pH adjustment by feedback control.

この操作は前記のフィードフォワード制御の場合と同様
にポンプ17を始動して行われるが、この場合のpH調
節は前記所定pH値から目標pH値までの微調節である
ため、コントロール弁18の開度は小さく維持される。
This operation is performed by starting the pump 17 in the same way as in the feedforward control described above, but since the pH adjustment in this case is a fine adjustment from the predetermined pH value to the target pH value, the control valve 18 is opened. degree is kept small.

この操作はpH電極2が目標pHを指示するまで行われ
る。
This operation is continued until the pH electrode 2 indicates the target pH.

以上によりpH調節を終った排水は流出管5から放流さ
れ、 pH調節槽1は再び排水を貯留し、試験容器8は
サンプリング開始し、上記操作がくり返えされる。
The waste water whose pH has been adjusted as described above is discharged from the outflow pipe 5, the pH adjustment tank 1 stores the waste water again, the test container 8 starts sampling, and the above operation is repeated.

以上の操作において、pH調節槽1の排水を攪拌しなが
ら演算結果による薬剤量を一度に゛仕入してフィードフ
ォワード制御するとともに、pH調節槽1内の排水のp
H変化を測定し、この指示値が目標pH値になるまで薬
剤を注入してフィードバック制御することにより、′急
速かつ正確にpH調節を行うことができる。
In the above operation, while stirring the waste water in the pH adjustment tank 1, the amount of chemicals determined by the calculation result is supplied at once and feedforward control is performed, and the pH of the waste water in the pH adjustment tank 1 is
By measuring the H change and performing feedback control by injecting the drug until the indicated value reaches the target pH value, pH can be adjusted rapidly and accurately.

排水のpH調節は非直線的であるため、原水のpHを測
定することによるフィードフォワード制御は不可能であ
るが、バイパスラインよりのサンプリングと、これに反
応性の速いpH調節剤を注入すること−より、 pH調
節に必要な薬剤量を予測し、フィードフォワード制御が
可能である。
Since pH adjustment of wastewater is non-linear, feedforward control by measuring the pH of raw water is not possible, but sampling from the bypass line and injecting a highly reactive pH adjuster into this is possible. -, it is possible to predict the amount of drug required for pH adjustment and perform feedforward control.

また排水の特性として、水量、水質等の経時的な負荷変
動は避けられないので、バイパスラインよりのサンプリ
ングを流量比例式サンプラーにより行えば、一定時間内
における均一試料どすることができ、予測を正確にする
ことができる。
In addition, as a characteristic of wastewater, it is unavoidable that the load changes over time in terms of water quantity, water quality, etc., so if sampling from the bypass line is performed using a flow rate proportional sampler, it is possible to obtain a uniform sample within a certain period of time, making it possible to make predictions. Can be accurate.

排水、特にメッキ排水中には弱酸1弱塩基或分および種
々の金属イオンを含むため、そのpH特性は時々刻々変
化する可能性があり、このような状態で予測した薬剤量
をそのままpi(調節槽iK注入したのでは注入薬剤に
過不足が生ずるおそれがあるが、目標pHの手前の所定
pH値に調節する量を一度に注入し、不足分はフィード
バック制御により注入することにより、迅速かつ正確K
pH調節を行うことができ、過剰注入のおそれはない。
Because wastewater, especially plating wastewater, contains weak acids, weak bases, and various metal ions, its pH characteristics may change from moment to moment. When injecting into a tank iK, there is a risk of excess or deficiency of the injected drug, but by injecting the amount that adjusts to a predetermined pH value before the target pH at once, and injecting the insufficient amount using feedback control, it can be done quickly and accurately. K
pH adjustment can be performed and there is no risk of over-injection.

なお1以上の実施例ではサンプリングをバイパス管にお
いて行っているが、pH調節槽1がら直接行ってもよい
。捷た試験容器8へのpH調節剤の注入量にポンプ14
によって計測しているが、コントロール弁18の開度に
よってもよい。またポンプ14の流量信号としては回転
数なども利用できる。さらに本発明はバッチ式のみなら
ず連続式のpH調節にも適用でき、また排水もメッキ排
水に限らず、他の排水にも適用可能である。
Although sampling is performed in the bypass pipe in one or more embodiments, it may also be performed directly from the pH adjustment tank 1. The pump 14 controls the amount of pH adjuster to be injected into the broken test container 8.
However, the opening degree of the control valve 18 may also be used. Further, as the flow rate signal of the pump 14, the number of revolutions can also be used. Furthermore, the present invention can be applied not only to batch-type pH control but also to continuous-type pH control, and is applicable not only to plating wastewater but also to other types of wastewater.

以上のとおり1本発明によれば、フィードフォワード制
御とフィードバック制御を組合せることを自動制御する
ことができ、緩衝指数の大きい排水についても迅速かつ
正確にpH調節を行い、薬剤の過剰注入を防止できるな
どの効果がある。
As described above, according to the present invention, it is possible to automatically control the combination of feedforward control and feedback control, quickly and accurately adjust the pH of wastewater with a large buffer index, and prevent excessive injection of chemicals. There are effects such as being able to.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は実施例のpH調節装置を示す系統図であり。 1はpH調節槽、2.10はpH電極、6は流量計測サ
ンプラー、8は試験容器、12.15は薬剤槽。 14.17はポンプ、19は流量計、20はタイマー、
21.23.25.28.29はA/D変換器、22.
26はコントローラ、24は演算装置である。 代理人 弁理士 柳 原    成
The drawing is a system diagram showing a pH adjusting device of an example. 1 is a pH adjustment tank, 2.10 is a pH electrode, 6 is a flow rate measurement sampler, 8 is a test container, and 12.15 is a chemical tank. 14.17 is a pump, 19 is a flow meter, 20 is a timer,
21.23.25.28.29 is an A/D converter, 22.
26 is a controller, and 24 is an arithmetic device. Agent Patent Attorney Sei Yanagihara

Claims (5)

【特許請求の範囲】[Claims] (1)排水を、受は入れてpH調節を行うpH調節槽と
、前記排水をサンプリングし、pH調節剤を注入する試
験容器と、この試験容器および前記pH調節槽への排水
の流入量ならびに試験容器へのpH調節剤の注入量から
、pH調節槽の排水を目標pH値より前の所定pH値に
するのに必要なpH調節剤量を演算する傅算装置と、演
算された量のpH調節剤をpH調節槽に注入するととも
に、排水のpHが目標pHになるまでのpH調節剤の不
足分を制御しな、がら注入する装置を備えたp)?調節
装置
(1) A pH adjustment tank that receives wastewater and adjusts its pH; a test container that samples the wastewater and injects a pH adjuster; the amount of inflow of the wastewater into the test container and the pH adjustment tank; A calculation device that calculates the amount of pH adjuster required to bring the waste water in the pH adjustment tank to a predetermined pH value before the target pH value from the amount of pH adjuster injected into the test container; p)?Equipped with a device that injects the pH adjuster into the pH adjustment tank while controlling the amount of pH adjuster that is insufficient until the pH of the wastewater reaches the target pH. regulator
(2)サンプリングは流量比例式サンプラーにより行う
ものである特許請求の範囲第1項記載の州調節装置
(2) The state regulating device according to claim 1, wherein sampling is performed by a flow rate proportional sampler.
(3)サンプリングはバイパス管において行うものであ
る特許請求の範囲第1項または第2項記載のpH調節装
(3) The pH adjusting device according to claim 1 or 2, wherein sampling is performed in a bypass pipe.
(4)試験容器へ注入するpH調節剤はpH調節槽へ添
加するpH調節剤より反応の速いものである特許請求の
範囲第1項ないし第3項のいずれかに記載のpH調節装
(4) The pH adjusting device according to any one of claims 1 to 3, wherein the pH adjusting agent injected into the test container has a faster reaction rate than the pH adjusting agent added to the pH adjusting tank.
(5)試験容器へのpH調節剤の注入は一定時間毎に行
うものである特許請求の範囲第1項ないし第4項のいず
れかに記載のpH調節装置
(5) The pH adjusting device according to any one of claims 1 to 4, wherein the pH adjusting agent is injected into the test container at regular intervals.
JP15671581A 1981-10-01 1981-10-01 Adjusting means for ph Pending JPS5858189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15671581A JPS5858189A (en) 1981-10-01 1981-10-01 Adjusting means for ph

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15671581A JPS5858189A (en) 1981-10-01 1981-10-01 Adjusting means for ph

Publications (1)

Publication Number Publication Date
JPS5858189A true JPS5858189A (en) 1983-04-06

Family

ID=15633749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15671581A Pending JPS5858189A (en) 1981-10-01 1981-10-01 Adjusting means for ph

Country Status (1)

Country Link
JP (1) JPS5858189A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62152662A (en) * 1985-12-25 1987-07-07 Hitachi Ltd Rectangular coil automatic finishing device
JP6350706B1 (en) * 2017-03-30 2018-07-04 栗田工業株式会社 Water quality adjustment water production equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62152662A (en) * 1985-12-25 1987-07-07 Hitachi Ltd Rectangular coil automatic finishing device
JP6350706B1 (en) * 2017-03-30 2018-07-04 栗田工業株式会社 Water quality adjustment water production equipment
WO2018179495A1 (en) * 2017-03-30 2018-10-04 栗田工業株式会社 Apparatus for producing treated water
JP2018167205A (en) * 2017-03-30 2018-11-01 栗田工業株式会社 Quality-controlled water production apparatus
US11198626B2 (en) 2017-03-30 2021-12-14 Kurita Water Industries Ltd. Apparatus for producing conditioned water

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