JPH0679718B2 - Sediment sludge extraction control device - Google Patents
Sediment sludge extraction control deviceInfo
- Publication number
- JPH0679718B2 JPH0679718B2 JP61302640A JP30264086A JPH0679718B2 JP H0679718 B2 JPH0679718 B2 JP H0679718B2 JP 61302640 A JP61302640 A JP 61302640A JP 30264086 A JP30264086 A JP 30264086A JP H0679718 B2 JPH0679718 B2 JP H0679718B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- concentration
- drawn
- flow rate
- sampling
- 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
- 239000010802 sludge Substances 0.000 title claims description 89
- 238000000605 extraction Methods 0.000 title description 2
- 239000013049 sediment Substances 0.000 title 1
- 239000007788 liquid Substances 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 15
- 239000007787 solid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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 本発明は例えは下水処理プロセスの最初沈殿池の沈殿汚
泥を引抜くための制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION A. INDUSTRIAL FIELD OF APPLICATION The present invention relates, for example, to a controller for withdrawing settling sludge from the first settling tank of a sewage treatment process.
B.発明の概要 本発明は、固液分離槽の沈殿汚泥を引抜きポンプにより
引抜く匠御装置において、 引抜かれた汚泥液の流量及び汚泥濃度の各測定値をサン
プリングし、各サンプリング時の測定値にもとずいて引
抜き開始時から現時点迄の引抜き汚泥の平均濃度を求
め、この値が設定値よりも低くなつたときに引抜きポン
プを停止することによつて、 引抜き汚泥を濃縮処理するための濃縮槽を最適に管理で
きるようにしたものである。B. Outline of the Invention The present invention is a takumi device that draws out settled sludge from a solid-liquid separation tank with a drawing pump, samples each measured value of the flow rate and sludge concentration of the drawn sludge liquid, and measures at each sampling. Based on the value, the average concentration of drawn sludge from the start of drawing to the present time is calculated, and when this value becomes lower than the set value, the drawing pump is stopped to concentrate the drawn sludge. The concentrating tank of is designed to be managed optimally.
C.従来の技術 活性汚泥による微生物処理を利用した下水処理プロセス
においては、上澄液と汚泥分との固液分離を行う最初沈
殿池等の固液分離槽が設けられている。この固液分離槽
に沈殿した汚泥は、沈殿汚泥引抜き制御装置により制御
されながら系外へ引抜かれる。従来この種の制御方法と
してタイマー制御、プリセツト制御あるいは濃度制御等
が実施されている。C. Conventional technology In a sewage treatment process that utilizes microbial treatment with activated sludge, a solid-liquid separation tank such as a first settling tank is provided for solid-liquid separation of supernatant and sludge. The sludge settled in this solid-liquid separation tank is drawn out of the system while being controlled by the settling sludge drawing controller. Conventionally, as this type of control method, timer control, preset control, density control, or the like has been performed.
ここにタイマー制御は、第４図に示すように引抜き時間
T1及び休止時間T2を設定し、サイクリツクに引抜く方法
である。またプリセツト制御は、第５図に示すように１
日当りの引抜き量Ｑm3/dayと引抜き回数ｎを設定して、
各回の目標引抜き量（ｑ＝Q/n）になるまでポンプを運
転し、目標値に達した時点でポンプを停止する方法であ
る。濃度制御は第６図に示すようにポンプを起動してか
ら引抜き汚泥濃度を連続測定し、この測定値が濃度設定
値よりも低くなつた時点でポンプを停止する方法であ
る。The timer control here is the pull-out time as shown in Fig. 4.
This is a method of setting T 1 and rest time T 2 and then pulling out in a cyclic manner. In addition, the preset control is set to 1 as shown in FIG.
Set the withdrawal amount per day Qm 3 / day and the withdrawal count n,
In this method, the pump is operated until the target withdrawal amount (q = Q / n) is reached each time, and when the target value is reached, the pump is stopped. Concentration control is a method in which the pumped sludge concentration is continuously measured after the pump is started as shown in FIG. 6, and the pump is stopped when the measured value becomes lower than the concentration set value.
D.発明が解決しようとする問題点 ここで下水処理施設の例えば最初沈殿池から引抜かれた
汚泥は汚泥処理プロセスの濃縮槽に送られて濃縮処理さ
れる。この濃縮槽における濃縮効率の善し悪しは後段の
消化、脱水、焼却等の汚泥処理プロセス全体に影響する
ため非常に重要である。第７図は濃縮槽の濃縮特性の一
例を示すグラフであり、縦軸は濃縮槽の濃縮汚泥野緯度
（濃縮汚泥の固形物濃度）CAと濃縮槽に投入された投入
汚泥の濃度（固形物濃度）CBとの比CA／CB、即ち汚泥濃
縮度を示し、横軸は投入汚泥の平均濃度を示している。
このグラフからわかるように、投入汚泥の平均濃度が高
くなるにつれて汚泥濃縮度は1.0に近づき、極端に高く
なると1.0以下になつてしまう。このことは、濃縮槽で
濃縮処理された濃縮汚泥の濃度が投入した汚泥の濃度と
等しいかあるいは低くなつていることを意味し、この場
合には濃縮槽の機能が果されなくなつてましう。従つて
高い汚泥濃縮度を得るためには、濃縮槽へ投入される汚
泥の平均濃度（平均固形物濃度）即ち最初沈殿池からの
引抜き汚泥の平均濃度を1.0％程度の低濃度に維持する
必要がある。D. Problems to be Solved by the Invention Here, sludge drawn from, for example, the first settling tank of a sewage treatment facility is sent to a concentration tank of a sludge treatment process for concentration. The efficiency of concentration in this concentration tank is very important because it affects the whole sludge treatment process such as digestion, dehydration and incineration in the latter stage. FIG. 7 is a graph showing an example of a concentration characteristics of the concentration tank, the vertical axis C A concentration of the entered turned sludge concentration tank (solid (solids concentration of the concentrated sludge) concentrated sludge cortex Latitude concentration tank Material concentration) C B ratio C A / C B , that is, sludge enrichment, and the horizontal axis represents the average concentration of input sludge.
As can be seen from this graph, the sludge enrichment approaches 1.0 as the average concentration of input sludge increases, and becomes 1.0 or less at extremely high levels. This means that the concentration of the concentrated sludge concentrated in the concentration tank is equal to or lower than the concentration of the input sludge, in which case the function of the concentration tank will not be fulfilled. . Therefore, in order to obtain a high sludge concentration, it is necessary to maintain the average concentration of sludge (average solids concentration) that is input to the concentration tank, that is, the average concentration of sludge drawn from the first settling basin at a low concentration of about 1.0%. There is.
また第８図は濃縮槽で分離された分離液（上澄水）の汚
泥濃度と投入汚泥の平均濃度との関係を示したグラフで
あり、このグラフからわかるように投入汚泥の平均濃度
が上昇するにつれて分離液の汚泥濃度が急激に悪化する
ことがわかる。従つて分離液特性からも濃縮槽を最適に
管理するためには、投入汚泥の平均濃度をあまり高くし
ないようにすることが必要である。FIG. 8 is a graph showing the relationship between the sludge concentration of the separated liquid (supernatant water) separated in the concentrating tank and the average concentration of input sludge. As can be seen from this graph, the average concentration of input sludge increases. It can be seen that the sludge concentration of the separated liquid rapidly deteriorates as the time passes. Therefore, in view of the characteristics of the separated liquid, it is necessary to keep the average concentration of the input sludge not too high in order to optimally manage the concentration tank.
ところで沈殿池から汚泥を引抜く場合に適用される従来
の制御方法のうち、タイマー制御及びプリセツト制御は
引抜き汚泥濃度を管理していない。沈殿池の流入負荷量
が変動する場合には沈殿汚泥量が変化するため、これら
２の制御法では、引抜き流量が一定であつても引抜き汚
泥濃度パターンは負荷量の変動に従つて変化してしま
う。一方濃度制御は、汚泥濃度を連続測定してはいる
が、この測定値をポンプの停止条件に用いているだけで
あるから、高濃度の汚泥を引抜く方法としては適してい
るが、引抜いた汚泥の平均濃度を管理することができな
い。このように従来の沈殿汚泥引抜き制御法では、引抜
き汚泥の平均濃度を安定に管理することができず、この
結果濃縮槽を最適に管理することができなかつた。By the way, among the conventional control methods applied when extracting sludge from a sedimentation basin, the timer control and the preset control do not control the concentration of extracted sludge. Since the amount of settled sludge changes when the inflow load of the sedimentation basin changes, in these 2 control methods, the drawn sludge concentration pattern changes according to the change of the load even if the drawn flow rate is constant. I will end up. On the other hand, the concentration control measures the sludge concentration continuously, but since this measurement value is only used for the pump stop condition, it is suitable as a method for extracting high-concentration sludge, but it was extracted. Unable to control the average concentration of sludge. As described above, the conventional settling sludge extraction control method cannot stably control the average concentration of the drawn sludge, and as a result, the concentration tank cannot be optimally controlled.
本発明の目的はこのような問題点を解決することにあ
る。An object of the present invention is to solve such a problem.
E.問題点を解決するための手段 本発明は、固液分離槽の沈殿汚泥を引抜く引抜きポンプ
と、この引抜きポンプにより引抜かれた汚泥液の流量及
び汚泥濃度を夫々測定する流量計及び濃度計と、この流
量計及び濃度計の各測定値を一定時間毎にサンプリング
して引抜き開始時から現時点までの引抜き汚泥の平均濃
度を求める演算部とよりなる。E. Means for Solving Problems The present invention is directed to a withdrawal pump for withdrawing settled sludge from a solid-liquid separation tank, a flow meter for measuring the flow rate and the sludge concentration of the sludge liquid withdrawn by the withdrawal pump, and a concentration meter. It consists of a meter and a calculation unit for sampling the measured values of the flow meter and the densitometer at regular intervals to obtain the average concentration of drawn sludge from the start of drawing to the present time.
F.作用 前記演算部は、各サンプリング時におれる前記流量の測
定値及び引抜き汚泥濃度の測定値を積算して単位時間当
りの引抜き汚泥量を求め、各サンプリング時の前記汚泥
量を加算して合計値を求めると共に、各サンプリング時
における前記流量の測定値を加算して合計値を求め、汚
泥量の合計値を流量の合計値により割り算することによ
り引抜き汚泥の平均濃度を求める。そしてこの平均濃度
が予め定めた設定平均濃度よりも低くなつたときに引抜
きポンプの停止指令を出力する。F. action The calculation unit obtains the amount of drawn sludge per unit time by integrating the measured value of the flow rate and the measured value of the drawn sludge concentration at each sampling, and adds the sludge amount at each sampling In addition to obtaining the total value, the measured values of the flow rate at each sampling are added to obtain the total value, and the average value of the drawn sludge is obtained by dividing the total value of the sludge amount by the total value of the flow rate. Then, when the average concentration becomes lower than the preset average concentration, a command to stop the drawing pump is output.
G.実施例 第１図は本発明の実施例を示す図である。図中１は固液
分離槽としての活性汚泥プロセスにおける最初沈殿池、
２は最初沈殿池１の沈殿汚泥を引抜くポンプ、３はポン
プ２で引抜かれる汚泥液の流量を測定する流量計、４は
前記汚泥液の汚泥濃度を測定する濃度計である。５は演
算部であり、流量計３及び濃度計４で夫々測定された流
量の測定値及び汚泥濃度の測定値を一定時間毎にサンプ
リングして、沈殿池１の汚泥引抜き開始時から現時点ま
での引抜き汚泥の平均濃度（平均固形物濃度）を演算に
より求め、その平均濃度が予め定められた設定平均濃度
よりも低くなつたときに、ポンプ駆動部６を介してポン
プ２に停止指令を出力する機能を有している。またこの
演算部５は、必要に応じて設定された引抜き開始時にポ
ンプの起動指令を出力する機能も有している。G. Embodiment FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, 1 is the first settling tank in the activated sludge process as a solid-liquid separation tank,
Reference numeral 2 is a pump for extracting the settled sludge from the first settling tank 1, 3 is a flow meter for measuring the flow rate of the sludge liquid drawn by the pump 2, and 4 is a densitometer for measuring the sludge concentration of the sludge liquid. Reference numeral 5 denotes a calculation unit, which samples the flow rate measurement value and the sludge concentration measurement value measured by the flow meter 3 and the densitometer 4 at regular time intervals, from the start of sludge withdrawal of the sedimentation tank 1 to the present time. An average concentration (average solids concentration) of drawn sludge is calculated, and when the average concentration is lower than a preset average concentration, a stop command is output to the pump 2 via the pump drive unit 6. It has a function. The calculation unit 5 also has a function of outputting a pump start command at the time of starting the drawing set as necessary.
ここで前記平均濃度の演算については、各サンプリング
時における流量の測定値及び汚泥濃度の測定値を積算し
て単位時間当りの汚泥量（固形物量）を求め、これら汚
泥量を加算すると共に、各サンプリング時における流量
の測定値を加算して、単位時間当りの汚泥量の合計値を
流量の測定値の合計値により割り算することにより求め
られる。Here, for the calculation of the average concentration, the measured value of the flow rate and the measured value of the sludge concentration at each sampling are integrated to obtain the sludge amount (solid amount) per unit time, and the sludge amounts are added together with each other. It is calculated by adding the measured values of the flow rate at the time of sampling and dividing the total value of the amount of sludge per unit time by the total value of the measured values of the flow rate.
図中７は濃縮槽である。In the figure, 7 is a concentrating tank.
次に上述実施例の作用について第２図及び第３図を参照
しながら説明する。演算部５からポンプの起動命令が発
せられて時刻t1にポンプ２が駆動され、演算部５はSUMX
及びSUMQの初期値を０にした後引抜き汚泥液の流量値XQ
と引抜き汚泥濃度値XCとをサンプリングして読み込む。
ここにSUMXとは各サンプリング時における単位時間当り
の引抜き汚泥量の合計値であり、SUMQとは各サンプリン
グ時における引抜き汚泥液の流量値の合計値である。そ
して読み込んだ流量値XQと汚泥濃度値XCとを積算して単
位時間当りの汚泥量（引抜き固形物の量）Ｍを求め、こ
の汚泥量Ｍにそれ以前のサンプリング時に求められた各
引抜き汚泥量の合計値SUMXを加算して、当該サンプリン
グ時までの引抜き汚泥量の合計値SUMXを求める。次いで
読み込んだ流量値XQにそれ以前のサンプリング時に求め
られた各流量の合計値SUMQを加算して、当該サンプリン
グ時までの流量の合計値SUMQを求める。しかる後に引抜
き汚泥量の合計値SUMXを流量の合計値SUMQで割り算し
て、ポンプ２の起動時から現サンプリング時までの引抜
き汚泥の平均濃度BARXを求め、この値BARXと引抜き汚泥
の設定平均濃度XSET（第３図ではCsetに相当する。）と
を比較し、BARXがXSET以下でなければサンプリングを続
け、XSET以下になつたとき例えば時刻t2にポンプ２の停
止命令を出力する。Next, the operation of the above-described embodiment will be described with reference to FIGS. 2 and 3. A pump start command is issued from the arithmetic unit 5 to drive the pump 2 at time t 1 , and the arithmetic unit 5 is SUMX.
After setting the initial value of SUMQ and SUMQ to 0, the flow rate value of drawn sludge liquid XQ
And the extracted sludge concentration value XC are sampled and read.
SUMX is the total value of the amount of drawn sludge per unit time at each sampling, and SUMQ is the total value of the flow rate of drawn sludge liquid at each sampling. Then, the read flow rate value XQ and the sludge concentration value XC are integrated to obtain a sludge amount (amount of drawn solids) M per unit time, and the sludge amount M is calculated for each drawn sludge amount obtained at the previous sampling. Add the total value SUMX of the above to obtain the total value SUMX of the amount of drawn sludge up to the sampling. Next, the read flow rate value XQ is added to the total value SUMQ of each flow rate obtained at the previous sampling to obtain the total value SUMQ of the flow rate up to the sampling time. Then, the total value SUMX of the amount of drawn sludge is divided by the total value SUMQ of the flow rate to obtain the average concentration BARX of the drawn sludge from the start of pump 2 to the current sampling, and this value BARX and the set average concentration of the drawn sludge Compared with XSET (corresponding to C set in FIG. 3), if BARX is not less than XSET, sampling is continued, and when it becomes less than XSET, for example, a stop command for pump 2 is output at time t 2 .
以上において本発明は、濃縮槽から他の濃縮槽へ汚泥を
輸送する場合にも適用することができる。In the above, the present invention can be applied also when transporting sludge from a concentration tank to another concentration tank.
H.発明の効果 以上のように本発明によれば、固液分離槽からの引抜き
汚泥の平均濃度を流入負荷変動等の外乱によらず希望値
（設定値）に制御することができるから、汚泥処理プロ
セスの単位プロセスの１つである濃縮槽内の汚泥濃度を
濃縮度と分離液濃縮度とから決まる最適な値に制御する
ことができ、従つて濃縮槽を最適に管理することができ
る。この結果例えば本発明を下水処理プロセスの最初沈
殿池の引抜き制御として適用すれば、後段の濃縮槽の効
率を最高値に維持することができる。H. Effect of the Invention As described above, according to the present invention, it is possible to control the average concentration of drawn sludge from the solid-liquid separation tank to a desired value (set value) regardless of disturbance such as inflow load fluctuation. The sludge concentration in the concentration tank, which is one of the unit processes of the sludge treatment process, can be controlled to an optimum value determined by the concentration and the concentration of the separated liquid, and thus the concentration tank can be optimally managed. . As a result, for example, when the present invention is applied as the withdrawal control of the first settling tank in the sewage treatment process, the efficiency of the subsequent concentration tank can be maintained at the maximum value.
第１図は本発明の実施例を示す構成図、第２図は実施例
の演算処理を示すフローチャート図、第３図（Ａ）〜
（Ｃ）は引抜き汚泥の濃度及びその平均値とポンプの駆
動との関係をしめす動作説明図、第４図はタイマー制御
の様子を示す動作説明図、第５図はプリセツト制御の様
子を示す動作説明図、第６図は濃度制御の様子を示す動
作説明図、第７図は濃縮槽の濃縮特性を示すグラフ、第
８図は濃縮槽の分離液特性を示すグラフである。 １……最初沈殿池、２……引抜きポンプ、３……濃度
計、４……流量計、５……演算部、７……濃縮槽。FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing the arithmetic processing of the embodiment, and FIG.
(C) is an operation explanatory view showing the relationship between the concentration of drawn sludge and its average value and the drive of the pump, FIG. 4 is an operation explanatory view showing the state of the timer control, and FIG. 5 is an operation showing the state of the preset control. Explanatory diagram, FIG. 6 is an operational explanatory diagram showing the state of concentration control, FIG. 7 is a graph showing the concentration characteristic of the concentration tank, and FIG. 8 is a graph showing the separated liquid characteristic of the concentration tank. 1 ... First settling tank, 2 ... drawing pump, 3 ... concentration meter, 4 ... flowmeter, 5 ... calculation unit, 7 ... concentrator.
Claims (1)
プと、この引抜きポンプにより引抜かれた汚泥液の流量
及び汚泥濃度を夫々測定する流量計及び濃度計と、この
流量計及び濃度計の各測定値を一定時間毎にサンプリン
グして引抜き開始時から現時点までの引抜き汚泥の平均
濃度を求め、この平均濃度が予め定めた設定平均濃度よ
りも低くなつたときに引抜きポンプの停止指令を出力す
る演算部とを設け、 前記演算部は、各サンプリング時における前記流量の測
定値及び引抜き汚泥濃度の測定値を積算して単位時間当
りの引抜き汚泥量を求め、各サンプリング時の前記汚泥
量を加算して合計値を求めると共に、各サンプリング時
における前記流量の測定値を加算して合計値を求め、汚
泥量の合計値を流量の合計値により割り算することによ
り引抜き汚泥の平均濃度を求めることを特徴とする沈殿
汚泥引抜き制御装置。1. A withdrawal pump for withdrawing settled sludge from a solid-liquid separation tank, a flowmeter and a densitometer for measuring the flow rate and sludge concentration of the sludge liquid withdrawn with this withdrawal pump, and this flowmeter and densitometer. Sampling each measured value at every constant time to obtain the average concentration of drawn sludge from the start of drawing to the present time, and when this average concentration becomes lower than a preset set average concentration, a stop pump stop command is issued. An arithmetic unit for outputting is provided, and the arithmetic unit obtains the amount of drawn sludge per unit time by integrating the measured value of the flow rate and the measured value of the drawn sludge concentration at each sampling, and the sludge amount at each sampling. In addition to calculating the total value by adding, the measured value of the flow rate at each sampling is added to calculate the total value, and the total value of the sludge amount is divided by the total value of the flow rate. An apparatus for controlling settling sludge withdrawal, wherein the average concentration of drawn sludge is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61302640A JPH0679718B2 (en) | 1986-12-18 | 1986-12-18 | Sediment sludge extraction control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61302640A JPH0679718B2 (en) | 1986-12-18 | 1986-12-18 | Sediment sludge extraction control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63156595A JPS63156595A (en) | 1988-06-29 |
| JPH0679718B2 true JPH0679718B2 (en) | 1994-10-12 |
Family
ID=17911416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61302640A Expired - Fee Related JPH0679718B2 (en) | 1986-12-18 | 1986-12-18 | Sediment sludge extraction control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0679718B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4543246B2 (en) * | 2003-12-01 | 2010-09-15 | 日立造船株式会社 | Method and apparatus for treating wastewater containing organic matter |
| CN114272653B (en) * | 2021-12-28 | 2023-06-23 | 上海威派格智慧水务股份有限公司 | Control system and method for sedimentation tank water |
-
1986
- 1986-12-18 JP JP61302640A patent/JPH0679718B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63156595A (en) | 1988-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |