JP2536097B2 - Respiratory rate measuring device - Google Patents
Respiratory rate measuring deviceInfo
- Publication number
- JP2536097B2 JP2536097B2 JP63275439A JP27543988A JP2536097B2 JP 2536097 B2 JP2536097 B2 JP 2536097B2 JP 63275439 A JP63275439 A JP 63275439A JP 27543988 A JP27543988 A JP 27543988A JP 2536097 B2 JP2536097 B2 JP 2536097B2
- Authority
- JP
- Japan
- Prior art keywords
- value
- oxygen concentration
- dissolved oxygen
- concentration
- tank
- 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.)
- Expired - Fee Related
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)
Description
【発明の詳細な説明】 A.産業上の利用分野 本発明は例えば活性汚泥プロセスにおける活性汚泥の
呼吸速度を測定するための装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a device for measuring the respiration rate of activated sludge, for example in an activated sludge process.
B.発明の概要 本発明は測定槽内に導入した検水を曝気して溶存酸素
濃度を高めておき、曝気停止後の溶存酸素濃度の減少速
度に基づいて検水中の微生物の呼吸速度を測定する装置
において、 曝気前の検水の溶存酸素濃度値における減少速度を求
めて、その値を呼吸速度として扱うことによって、 微生物の呼吸速度を正確に求めることができるように
したものである。B. Outline of the Invention The present invention aerates the test water introduced into the measurement tank to increase the dissolved oxygen concentration, and measures the respiration rate of microorganisms in the test water based on the rate of decrease in the dissolved oxygen concentration after the aeration is stopped. In this device, the rate of decrease in the dissolved oxygen concentration value of the sample water before aeration is calculated, and that value is treated as the respiratory rate, so that the respiratory rate of microorganisms can be accurately determined.
C.従来の技術 有機性廃水を処理する方法として活性汚泥を利用する
方法がある。この方法は廃水を曝気槽に流入させ、ここ
で活性汚泥と混合すると共に空気を供給して廃水を処理
し、その混合液を最終沈澱池に導いて固液分離し、その
上澄水を処理水として放流する方法である。C. Conventional technology As a method of treating organic wastewater, there is a method of using activated sludge. In this method, wastewater is introduced into an aeration tank, where it is mixed with activated sludge and air is supplied to treat the wastewater, and the mixture is led to a final settling tank for solid-liquid separation, and the supernatant water is treated water. It is a method of releasing as.
こうした活性汚泥プロセスにおける活性汚泥の活性度
の評価として活性汚泥の呼吸速度（以下これを「rr」と
いう）が用いられている。従来rrを自動的に測定するた
めには、第３図に示す装置を用いて次のようにして行わ
れていた。第３図中l1,l2は夫々検水導入口及び検水排
出口、２は測定槽であり、測定槽２の入口及び出口側に
は通水路を形成するチューブ３が連結されている。V1,V
2はピンチバルブであり、エア注入口41,42よりのエアの
注入，排気によりチューブ３がピンチ状態，解除状態に
なり、これにより開閉動作が行われる。５は溶存酸素
（以下「DO」という）濃度検出部としてのDO電極、６は
撹拌機、７はエア注入口である。The respiration rate of activated sludge (hereinafter referred to as "r r ") is used to evaluate the activity of activated sludge in such activated sludge process. Conventionally, the automatic measurement of r r has been performed as follows using the device shown in FIG. In FIG. 3, l 1 and l 2 are test water inlets and test water outlets, 2 is a measuring tank, and a tube 3 forming a water passage is connected to the inlet and outlet sides of the measuring tank 2. . V 1 , V
2 is a pinch valve, the air inlet 4 1, 4 air injection than 2, the tube 3 by the exhaust pinched state, becomes disengaged state, thereby opening and closing operation is performed. Reference numeral 5 is a DO electrode as a dissolved oxygen (hereinafter referred to as “DO”) concentration detection unit, 6 is a stirrer, and 7 is an air inlet.
先ずエア注入口７よりエアを導入してエアリフトを形
成し、曝気槽内の活性汚泥液を測定槽２内に導入する。
このときピンチバルブV1,V2は開いている。次にピンチ
バルブV1を閉じて測定槽２内を曝気し、DO濃度をある一
定値例えば5mg/lまで高める。DO濃度が設定値まで上昇
した時点で曝気を停止し、ピンチバルブV2を閉じて撹拌
を開始する。活性汚泥（好気性微生物）による酸素消費
に伴い、DO濃度が低下し、その減少速度からrrを算出す
る。First, air is introduced from the air inlet 7 to form an air lift, and the activated sludge liquid in the aeration tank is introduced into the measuring tank 2.
At this time, the pinch valves V 1 and V 2 are open. Next, the pinch valve V 1 is closed to aerate the inside of the measuring tank 2 to increase the DO concentration to a certain constant value, for example, 5 mg / l. When the DO concentration rises to the set value, the aeration is stopped, the pinch valve V 2 is closed, and stirring is started. The DO concentration decreases as oxygen is consumed by activated sludge (aerobic microorganisms), and r r is calculated from the rate of decrease.
D.発明が解決しようとする課題 DO濃度が第４図の実線で示すように一定速度で減少し
ている場合には、rrの測定値は曝気槽内のrrと対応して
いる。ところで第４図の破線で示すようにDO濃度の低下
に伴いrrの測定値が低下してくることがある。この場合
従来ではrrが最大の部分をその検体のrr値としていた。
しかしながら実際の曝気槽内におけるDO濃度が低くなる
と、曝気槽内でのrrはDO濃度により抑制されるため、測
定槽２内で求めたrr値の最大値よりも小さくなることが
予想される。従ってrrの測定値は曝気槽内のrrを示して
いないことになり、rrによる正しい評価ができないこと
があった。Challenge DO concentration D. invention is to solve if the decreasing at a constant rate as indicated by the solid line in FIG. 4, the measured value of r r corresponds with r r aeration tank. By the way, as indicated by the broken line in Fig. 4, the measured value of r r may decrease as the DO concentration decreases. In this case, conventionally, the part with the largest r r was used as the r r value of the sample.
However, when the DO concentration in the actual aeration tank becomes low, the r r in the aeration tank is suppressed by the DO concentration, so it is expected that it will be smaller than the maximum r r value found in the measurement tank 2. It Thus measurements of the r r becomes not show the r r aeration tank, there may not be the correct evaluation by r r.
本発明の目的は、実際の曝気槽内のrrを正確に求め、
これにより例えば活性汚泥プロセスにおける監視，制御
の精度の向上を図ることにある。The object of the present invention is to accurately determine r r in the actual aeration tank,
This is aimed at improving the accuracy of monitoring and control in the activated sludge process, for example.
E.課題を解決するための手段 本発明は、測定槽内にて曝気される前の検水中のDO濃
度を検出するDO濃度検出部と、この検出部及び測定槽内
のDO濃度検出部の各検出値が入力される演算部とを有し
ている。E. Means for solving the problem The present invention is a DO concentration detection unit for detecting the DO concentration in the test water before being aerated in the measurement tank, and the detection unit and the DO concentration detection unit in the measurement tank. And a calculation unit to which each detected value is input.
F.作用 演算部では、測定槽内の曝気中のDO濃度の減少速度を
例えば各DO濃度毎に演算し、そのDO濃度が曝気前のDO濃
度と一致したときの減少速度を求め、その値をrrとして
出力する。F. Action The calculation unit calculates the rate of decrease of DO concentration during aeration in the measurement tank, for example, for each DO concentration, and obtains the rate of decrease when that DO concentration matches the DO concentration before aeration, and then calculates that value. Is output as r r .
G.実施例 第１図は本発明の実施例を示す図であり、８は曝気
槽、９は最終沈澱池、10は第３図に示すrr計である。こ
の実施例では、rr計10に隣接してDO濃度検出部を備えた
DO計11を配置すると共に、このDO計11及びrr計10よりの
出力値に基づいて曝気槽８内におけるrrを求める演算部
12を設けている。G. Examples FIG. 1 is a diagram showing an example of the present invention, in which 8 is an aeration tank, 9 is a final settling tank, and 10 is an r r meter shown in FIG. In this example, a DO concentration detector was provided adjacent to the r r meter 10.
A calculation unit that arranges the DO meter 11 and calculates r r in the aeration tank 8 based on the output values from the DO meter 11 and the r r meter 10.
12 are provided.
このような構成では、rr計10よりのDO濃度検出値が演
算部12に入力されて例えば第２図に示すDO濃度の減少曲
線が描かれる。一方DO計11より曝気槽８内のDO濃度検出
値が入力され、この値が例えばC1である場合、このC1に
おける減少曲線上の点Ｐにおける接線の傾きが演算部12
で求められ、その傾きをrrとして出力する。In such a configuration, the DO concentration detection value from the r r meter 10 is input to the calculation unit 12 and, for example, the DO concentration decrease curve shown in FIG. 2 is drawn. On the other hand, when the DO concentration detection value in the aeration tank 8 is input from the DO meter 11 and this value is C 1 , for example, the slope of the tangent line at the point P on the decrease curve at C 1 is calculated by the calculation unit 12
And the slope is output as r r .
以上において曝気槽８内のDO濃度検出値としては、rr
計10内のrr測定用DO電極よりの値であって、測定槽（第
３図参照）の曝気前の値を用いてもよい。In the above, the DO concentration detection value in the aeration tank 8 is r r
It is also possible to use the value from the DO electrode for r r measurement in the total 10 before the aeration of the measurement tank (see FIG. 3).
また、DO計11よりの検出値が変動している場合には、
その移動平均値例えばrr測定周期毎の移動平均値を求
め、その値を曝気槽８内のDO濃度検出値として用いても
よいし、あるいは曝気槽８内のDO濃度が極端に低い場合
には、ある下限値例えば0.5mg/lをＤ濃度検出値として
用いてもよく、このようにすれば検出値をそのまま用い
るよりも正確な測定が期待できる。Also, if the detected value from the DO meter 11 is fluctuating,
The moving average value, for example, the moving average value for each r r measurement cycle, may be obtained and used as the DO concentration detection value in the aeration tank 8, or when the DO concentration in the aeration tank 8 is extremely low. May use a lower limit value such as 0.5 mg / l as the D concentration detection value. In this case, more accurate measurement can be expected than using the detection value as it is.
ところでrrが炭素系基質の消費と硝化との両方の因子
に左右されるため、例えばアリルチオ尿素等の硝化抑制
剤を添加して硝化を抑制した状態でrrを測定する場合が
あるが、本発明ではこのような場合にも適用することが
できる。By the way, since r r depends on both factors of carbon substrate consumption and nitrification, for example, r r may be measured in a state where nitrification inhibitor such as allylthiourea is added to suppress nitrification. The present invention can be applied to such a case.
更には本発明は、活性汚泥プロセスの他にも発酵工学
におけるrrの測定に対しても適用できる。Furthermore, the present invention can be applied to the measurement of r r in fermentation engineering as well as the activated sludge process.
H.発明の効果 本発明によれば、rr計の測定槽に導かれる検水のDO濃
度例えば活性汚泥プロセスの曝気槽内のDO濃度を求め
て、その値における測定槽内のDO濃度減少曲線の傾きを
rrとして求めているため、実際の検水のrrを正確に求め
ることができる。従って例えば活性汚泥プロセスにおい
ては、散気手段の散気効率、総括酸素移動係数、及び曝
気効率等を正確に評価でき、この結果rrを用いた監視，
制御の精度を向上させることができる。H. Effect of the Invention According to the present invention, the DO concentration of the test water guided to the measuring tank of the r r meter, for example, the DO concentration in the aeration tank of the activated sludge process, is determined, and the DO concentration in the measuring tank at that value is reduced. The slope of the curve
Since it is calculated as r r , the actual r r r of the test water can be accurately calculated. Monitoring Thus in example activated sludge process, air diffusion efficiency of the air diffuser means, overall oxygen transfer coefficient, and can accurately evaluate the aeration efficiency and the like, using the result r r,
Control accuracy can be improved.
第１図は本発明の一実施例を示す構成図、第２図及び第
４図はDO濃度の経時変化を示すグラフ、第３図は呼吸速
度計を示す縦断面図である。 ２……測定槽、５……溶存酸素電極、８……曝気槽、10
……呼吸速度計、11……溶存酸素計、12……演算部。FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 and 4 are graphs showing changes in DO concentration with time, and FIG. 3 is a longitudinal sectional view showing a respiration rate meter. 2 ... Measuring tank, 5 ... Dissolved oxygen electrode, 8 ... Aeration tank, 10
...... Respiratory rate meter, 11 …… Dissolved oxygen meter, 12 …… Calculator.
Claims (1)
水を導入し、測定槽内を曝気することにより溶存酸素濃
度を所定値まで高めておき、その後曝気を停止して、溶
存酸素濃度検出部よりの検出値の減少率に基づいて検水
中の微生物の呼吸速度を測定する装置において、 前記曝気前の検水中の溶存酸素濃度を検出する溶存酸素
濃度検出部と、この検出部及び測定槽内の溶存酸素濃度
検出部の各検出値を入力し、曝気前の溶存酸素濃度値に
おける曝気中の溶存酸素濃度の減少速度を求めて、その
値を呼吸速度として出力する演算部とを設けてなること
を特徴とする呼吸速度測定装置。1. Dissolved oxygen concentration is raised to a predetermined value by introducing test water into a measuring tank equipped with a dissolved oxygen concentration detection unit and aerating the inside of the measuring tank. In a device for measuring the respiration rate of microorganisms in test water based on the rate of decrease of the detection value from the oxygen concentration detection unit, a dissolved oxygen concentration detection unit for detecting the dissolved oxygen concentration in the test water before aeration, and this detection unit Also, by inputting each detected value of the dissolved oxygen concentration detection unit in the measurement tank, the decrease rate of the dissolved oxygen concentration during aeration at the dissolved oxygen concentration value before aeration, and the calculation unit that outputs that value as a respiration rate A respiration rate measuring device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275439A JP2536097B2 (en) | 1988-10-31 | 1988-10-31 | Respiratory rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275439A JP2536097B2 (en) | 1988-10-31 | 1988-10-31 | Respiratory rate measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02122262A JPH02122262A (en) | 1990-05-09 |
| JP2536097B2 true JP2536097B2 (en) | 1996-09-18 |
Family
ID=17555538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275439A Expired - Fee Related JP2536097B2 (en) | 1988-10-31 | 1988-10-31 | Respiratory rate measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2536097B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5023487B2 (en) * | 2005-12-19 | 2012-09-12 | パナソニック株式会社 | Wastewater treatment method |
-
1988
- 1988-10-31 JP JP63275439A patent/JP2536097B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02122262A (en) | 1990-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |