JPH0720590B2 - Oxygen supply controller in oxidation ditch - Google Patents
Oxygen supply controller in oxidation ditchInfo
- Publication number
- JPH0720590B2 JPH0720590B2 JP61043796A JP4379686A JPH0720590B2 JP H0720590 B2 JPH0720590 B2 JP H0720590B2 JP 61043796 A JP61043796 A JP 61043796A JP 4379686 A JP4379686 A JP 4379686A JP H0720590 B2 JPH0720590 B2 JP H0720590B2
- Authority
- JP
- Japan
- Prior art keywords
- mixed liquid
- rotor
- ditch
- meter
- ditch 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 - Lifetime
Links
- 229910052760 oxygen Inorganic materials 0.000 title claims description 16
- 239000001301 oxygen Substances 0.000 title claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 15
- 230000003647 oxidation Effects 0.000 title claims description 9
- 238000007254 oxidation reaction Methods 0.000 title claims description 9
- 239000007788 liquid Substances 0.000 claims description 34
- 238000005070 sampling Methods 0.000 claims description 12
- 239000010802 sludge Substances 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 10
- 230000001546 nitrifying effect Effects 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000011259 mixed solution Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000011144 upstream manufacturing Methods 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)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、オキシデーションディッチにおける酸素供給
量制御装置に関する。The present invention relates to an oxygen supply amount control device in an oxidation ditch.
循環路を有するディッチ槽に汚水及び活性汚泥の流入路
と硝化脱窒処理された混合液を流出する流出路とを接続
し、前記循環路の流入路上流位置に流入した汚水及び活
性汚泥の混合液を攪拌曝気する共に循環させるロータを
設け、前記流出路にディッチ槽内の硝化脱窒処理された
混合液を流出路に溢流させる可動ゲートを設けたオキシ
デーションディッチにあっては、通常循環路の硝化部に
おける汚水及び活性汚泥の混合液の硝化を確実に行なう
必要上から、循環路の混合液中の溶存酸素（以下、Doと
いう）濃度を高めに保つようになされている。したがっ
て、循環路における混合液の硝化が順調に行なわれない
場合、これが脱窒部へ移行すると脱窒細菌がDoを取り入
れ、本来脱窒に使用するべきBOD成分が好気的に消費さ
れる嫌いがある。A ditch tank having a circulation path is connected to an inflow path for sewage and activated sludge and an outflow path for discharging a nitrifying / denitrifying mixed liquid, and mixing of sewage and activated sludge flowing into an upstream position of the inflow path of the circulation path. The oxidation ditch is equipped with a rotor that circulates the liquid while stirring and aeration, and a circulation gate is provided in the outflow passage that overflows the nitrification-denitrifying mixed liquid in the ditch tank to the outflow passage. The concentration of dissolved oxygen (hereinafter referred to as “Do”) in the mixed solution in the circulation path is kept high in order to reliably nitrify the mixed solution of wastewater and activated sludge in the nitrification section of the path. Therefore, if nitrification of the mixed solution in the circulation path does not proceed smoothly, when this moves to the denitrification section, the denitrifying bacteria take in Do, and the BOD component that should originally be used for denitrification is aerobically consumed. There is.
このため、例えば、特開昭59−10393号公報に示される
ように、ディッチ槽の循環路内の所定位置にDo濃度検出
センサを設けて混合液のDo濃度を検出し、その検出値と
予め設定されている設定値とを演算器にて比較演算し、
その結果に基づいてゲート制御部により可動ゲートの上
下位置を制御して、循環路内の水位を変化させ、ロータ
の浸水深さに対応して酸素供給量を調節し、Do濃度が所
定の値となるように制御する酸素供給量制御装置があ
る。For this reason, for example, as shown in Japanese Patent Laid-Open No. 59-10393, a Do concentration detection sensor is provided at a predetermined position in the circulation path of the ditch tank to detect the Do concentration of the mixed liquid, and the detected value and the Comparing the set value with the calculator,
Based on the result, the gate control unit controls the vertical position of the movable gate to change the water level in the circulation path, adjust the oxygen supply amount according to the inundation depth of the rotor, and set the Do concentration to a predetermined value. There is an oxygen supply amount control device for controlling so that
ところが、この酸素供給量制御装置を実施するにあたっ
ては、Do濃度をDo濃度検出センサで測定するが、このセ
ンサの電極に硫化物等の付着物が生じるために該電極が
劣化シ、キャリブレーションを正確に設定することがで
きないなどの点で不都合があり、Do濃度検出センサの長
期にわたる連続使用が困難となり実用的でない。However, in carrying out this oxygen supply amount control device, the Do concentration is measured by a Do concentration detection sensor, but because electrodes such as sulfide deposits on the electrodes of this sensor, the electrodes deteriorate and calibration is required. It is inconvenient because it cannot be set accurately, and it is difficult to use the Do concentration detection sensor continuously for a long time, which is not practical.
本発明は上記の点に鑑みなされたもので、ディッチ槽中
の硝酸及び亜硝酸（以下、これらをNOxと総称する）濃
度を紫外線を用いて測定し、その結果を基に混合液中の
Do量を迅速かつ正確に調整するオキシデーションディッ
チにおける酸素供給量制御装置を提供することを目的と
するものである。The present invention has been made in view of the above points, the concentration of nitric acid and nitrous acid in the ditch tank (hereinafter, these are collectively referred to as NOx) was measured using ultraviolet light, based on the results, in a mixed solution
An object of the present invention is to provide an oxygen supply amount control device in an oxidation ditch that adjusts the Do amount quickly and accurately.
そこで本発明は、循環路を有するディッチ槽に汚水及び
活性汚泥の流入口と硝化脱窒処理された混合液の流出口
とを設け、前記循環路の流入口下流位置に循環路に流入
した汚水及び活性汚泥の混合液を攪拌曝気する共に循環
させるロータを設け、前記流出口にディッチ槽内の硝化
脱窒処理された混合液を流出路に溢流させる可動ゲート
を設けたオキシデーションディッチにおける酸素供給量
制御装置において、前記ディッチ槽に前記循環路の混合
液を採取する採水管を接続し、該採水管に、採取された
混合液の懸濁物を除去するフィルタと、混合液を常時採
取するポンプと、NOx濃度を紫外線吸収法によって測定
する紫外線計とを夫々設け、該紫外線計にて測定された
NOx濃度の測定値と設定値とを比較演算する演算器と、
該演算器にて比較演算された結果により、前記ロータの
回転を制御するロータ制御部及び可動ゲートの上下位置
を制御するゲート制御部とを備えたことを特徴としてい
る。In view of this, the present invention provides a ditch tank having a circulation passage with an inlet for sewage and activated sludge and an outlet for a nitrifying / denitrifying mixed liquid, and sewage flowing into the circulation passage at a position downstream of the inlet of the circulation passage. And a rotor for circulating and agitating and aeration of the mixed liquid of activated sludge, and oxygen in the oxidation ditch provided with a movable gate for overflowing the nitrifying / denitrifying mixed liquid in the ditch tank to the outflow passage at the outlet. In the supply amount control device, a sampling pipe for collecting the mixed liquid in the circulation path is connected to the ditch tank, and a filter for removing a suspension of the collected mixed liquid and the mixed liquid are constantly collected in the sampling pipe. And a UV meter for measuring the NOx concentration by the UV absorption method, respectively.
An arithmetic unit for comparing and calculating the measured value of NOx concentration and the set value,
A rotor control unit for controlling the rotation of the rotor and a gate control unit for controlling the vertical position of the movable gate according to the result of the comparison calculation by the arithmetic unit are provided.
したがって、ポンプにて常時採水管に採取されたディッ
チ槽内を循環している混合液は、フィルタにて懸濁物を
除去された後紫外線計にて長期間正確に測定され、演算
器にてこの測定値と予め設定された設定値とが比較演算
され、この結果に基づいてロータ制御部及びゲート制御
部により、ロータの回転と可動ゲートの上下位置が制御
され、ディッチ槽内を循環している混合液のDo量を迅速
かつ正確に調整することができる。Therefore, the mixed liquid that is constantly circulated in the ditch tank collected in the water sampling pipe by the pump is accurately measured for a long period of time by the UV meter after the suspended matter is removed by the filter, and then by the calculator. The measured value and the preset value are compared and calculated, and based on the result, the rotor control unit and the gate control unit control the rotation of the rotor and the vertical position of the movable gate to circulate in the ditch tank. The Do amount of the mixed liquid can be adjusted quickly and accurately.
以下、本発明のオキシデーションディッチにおける酸素
供給量制御装置の一実施例を図面に基づいて説明する。An embodiment of an oxygen supply amount control device in an oxidation ditch according to the present invention will be described below with reference to the drawings.
ディッチ槽１は、平面トラック状を呈し、中央部に長手
方向の隔壁２を設けた循環路３を有し、この循環路３
を、図において隔壁２の左側を転換部A,上側を直線部B,
右側を転換部C,下側を直線部Ｄとすると、転換部Ａと直
線部Ｂとの間に、汚水及び活性汚泥の流入路４の流入口
５が設けられると共に、直線部Ｄと転換部Ａとの間に、
硝化脱窒処理された混合液の流出路６の流出口７が設け
られている。The ditch tank 1 has a planar track shape, and has a circulation path 3 provided with a partition wall 2 in the longitudinal direction at the center thereof.
In the figure, the left side of the partition wall 2 is the conversion section A, the upper side is the straight section B,
When the right side is the conversion section C and the lower side is the straight section D, the inflow port 5 of the inflow passage 4 for sewage and activated sludge is provided between the conversion section A and the straight section B, and the straight section D and the conversion section are provided. Between A and
An outflow port 7 of an outflow passage 6 for the nitrifying / denitrifying mixed liquid is provided.
前記循環路３の流入口５の下流位置には、直線部Ｂを横
切って流入した汚水及び活性汚泥の混合液を、攪拌曝気
する共に循環させるロータ８が設けられている。前記流
出口７には、ディッチ槽１内の硝化脱窒処理された混合
液を流出路６に溢流させる可動ゲート９が設けられてい
る。At a position downstream of the inflow port 5 of the circulation path 3, there is provided a rotor 8 which circulates the mixed liquid of the sewage and the activated sludge that has flowed across the straight line portion B while stirring and aeration. The outflow port 7 is provided with a movable gate 9 for causing the nitrification-denitrifying mixed liquid in the ditch tank 1 to overflow into the outflow passage 6.
前記ディッチ槽１の直線部Ｄの終端よりには、前記循環
路３の混合液を採取する採水管10が接続されている。該
採水管10には、採取された混合液の懸濁物を除去するフ
ィルタ11と、混合液を常時採取するポンプ12と、NOx濃
度を紫外線吸収法によって測定する紫外線計（以下、UV
計という）13とが夫々設けられている。A water sampling pipe 10 for sampling the mixed liquid in the circulation path 3 is connected to the end of the straight portion D of the ditch tank 1. The water sampling pipe 10 includes a filter 11 for removing a suspension of the collected mixed liquid, a pump 12 for constantly collecting the mixed liquid, and an ultraviolet meter (hereinafter, UV meter) for measuring NOx concentration by an ultraviolet absorption method.
13) are provided respectively.
また、該UV計13にて測定されたNOx濃度の測定値と予め
設定された設定値とを比較演算する演算器14と、該演算
器14にて比較演算された結果により、前記ロータ８の回
転を制御するロータ制御部15及び可動ゲートの上下位置
を制御するゲート制御部16とが備えられている。In addition, the calculator 14 for comparing and calculating the measured value of the NOx concentration measured by the UV meter 13 and the preset setting value, and the result of the comparison calculation by the calculator 14 A rotor control unit 15 that controls rotation and a gate control unit 16 that controls the vertical position of the movable gate are provided.
したがって、流入路４から流入口５を介して循環路３の
転換部Ａに流入された汚水及び活性汚泥は、転換部Ａと
直線部Ｂとの間に設けた溶存酸素量可変装置の一つであ
るロータ８の回転により攪拌曝気されて混合液となっ
て、転換部C,直線部Ｄから再び転換部Ａに移動して、攪
拌曝気を繰返しながら循環して硝化脱窒処理される。Therefore, the sewage and activated sludge that have flowed into the conversion section A of the circulation path 3 from the inflow path 4 through the inflow port 5 is one of the dissolved oxygen amount variable devices provided between the conversion section A and the straight line section B. The mixture is aerated and agitated by the rotation of the rotor 8 and moves from the conversion section C, the straight section D to the conversion section A again, and is circulated while repeating the aeration and is subjected to nitrification denitrification treatment.
そして、この循環により硝化脱窒処理された混合液は、
少しづつ転換部Ａにて流出口７に設けた溶存酸素量可変
装置の別の一つである可動ゲート９を乗越えて流出路６
に流出される。Then, the mixed liquid subjected to nitrification and denitrification treatment by this circulation is
The flow path 6 is gradually crossed over the movable gate 9 which is another one of the dissolved oxygen amount varying devices provided at the outflow port 7 at the conversion section A.
Be leaked to.
一方、循環路３を循環しているディッチ槽１の混合液
は、ポンプ12にて常時採水管10に採取され、フィルタ11
にて懸濁物を除去された後、UV計13にて紫外線吸収法に
よりNOx濃度が正確に測定される。On the other hand, the mixed liquid in the ditch tank 1 circulating in the circulation path 3 is constantly collected by the pump 12 in the water sampling pipe 10, and the filter 11
The NOx concentration is accurately measured by the UV absorption method by the UV meter 13 after the suspension is removed at.
このUV計13にて測定されたNOx濃度の測定値は、演算器1
4に送られ、該演算器14にて予め設定されている設定値
と比較演算される。そして、この結果によりロータ８の
回転を制御するロータ制御部15及び可動ゲート９の上下
位置を制御するゲート制御部16に指令を送る。The measurement value of NOx concentration measured by this UV meter 13 is calculated by the calculator 1
It is sent to 4 and is compared and calculated by the calculator 14 with a preset value. Based on this result, a command is sent to the rotor control unit 15 that controls the rotation of the rotor 8 and the gate control unit 16 that controls the vertical position of the movable gate 9.
ロータ８はその回転量が大のときDo量が増加し、一方デ
ィッチ槽１内の水位がロータ８の中心位置のときDo量が
最大である。When the rotation amount of the rotor 8 is large, the Do amount increases, while when the water level in the ditch tank 1 is at the center position of the rotor 8, the Do amount is maximum.
したがって、NOx濃度の測定値が設定値より大の場合はD
o量が過剰であることから、ロータ８の回転を小にする
ようロータ制御部15に指令を出すと共に、可動ゲート９
の位置を変えて水位を変えるようにゲート制御部16に指
令を出してロータ８の浸水深さを調整して酸素の供給量
を減らし、一方、測定値が設定値より小の場合はDo量が
過少であることから、ロータ８の回転量を大にし、また
水位が最適位置となるよう可動ゲート９を移動させるよ
うに、ロータ制御部15及びゲート制御部16から指令を出
してロータ８の浸水深さを調整して酸素の供給量を増加
させる。Therefore, if the measured NOx concentration is higher than the set value, D
Since the amount is excessive, a command is issued to the rotor controller 15 to reduce the rotation of the rotor 8 and the movable gate 9
The gate controller 16 is instructed to change the water level to change the water level to adjust the water immersion depth of the rotor 8 to reduce the oxygen supply amount. On the other hand, when the measured value is less than the set value, the Do amount is changed. Is too small, the rotor control unit 15 and the gate control unit 16 issue commands to increase the rotation amount of the rotor 8 and move the movable gate 9 so that the water level becomes the optimum position. Adjust the flood depth to increase the oxygen supply.
このロータ８の回転と可動ゲート９の上下位置の双方を
制御することにより、ディッチ槽１内を循環している混
合液のDo量を迅速かつ正確に調整することができる。By controlling both the rotation of the rotor 8 and the vertical position of the movable gate 9, the Do amount of the mixed liquid circulating in the ditch tank 1 can be adjusted quickly and accurately.
本発明は上記にように、循環路を有するディッチ槽に汚
水及び活性汚泥の流入口と硝化脱窒処理された混合液の
流出口とを設け、循環路の流入口下流位置に循環路に流
入した汚水及び活性汚泥の混合液を攪拌曝気する共に循
環させるロータを設け、流出口にディッチ槽内の硝化脱
窒処理された混合液を流出路に溢流させる可動ゲートを
設け、ディッチ槽に循環路の混合液を採取する採水管を
接続し、該採水管に、採取された混合液の懸濁物を除去
するフィルタと、混合液を常時あるいは定期的に採取す
るポンプと、NOx濃度を紫外線吸収法によって測定する
紫外線計とを夫々設け、該紫外線計にて測定されたNOx
濃度の測定値と設定値とを比較演算する演算器と、該演
算器にて比較演算された結果により、ロータの回転を制
御するロータ制御部及び可動ゲートの上下位置を制御す
るゲート制御部とを備えたので、ディッチ槽内を循環し
ている混合液のNOx濃度を、紫外線計にて紫外線吸収法
によって測定することにより長期間正確に測定すること
ができ、しかも、ロータの回転と可動ゲートの上下位置
の双方を制御することにより、ディッチ槽内を循環して
いる混合液のDo量を迅速かつ正確に調整することができ
る。According to the present invention, as described above, a ditch tank having a circulation path is provided with an inflow port for sewage and activated sludge and an outflow port for the nitrifying / denitrifying mixed liquid, and the inflow is introduced into the circulation line at a position downstream of the inflow port of the circulation line. A rotor that circulates the mixed liquid of the wastewater and activated sludge that is agitated and aerated is installed, and a movable gate that overflows the nitrifying / denitrifying mixed liquid in the ditch tank to the outflow passage is installed at the outlet and circulates in the ditch tank. Connect a water sampling pipe to collect the mixed liquid of the channel, to the water sampling pipe, a filter to remove the suspension of the collected mixed liquid, a pump to collect the mixed liquid constantly or periodically, and an NOx concentration of ultraviolet rays. An NOx measured by the UV meter is provided with each UV meter for measuring by the absorption method.
A calculator for comparing and calculating the measured value of the concentration and the set value; a rotor controller for controlling the rotation of the rotor and a gate controller for controlling the vertical position of the movable gate according to the result of the comparison and calculation by the calculator. Since the NOx concentration of the mixed liquid circulating in the ditch tank is measured by the ultraviolet absorption method using an ultraviolet meter, it can be accurately measured for a long period of time because it is equipped with a rotor and a movable gate. By controlling both the upper and lower positions of, the Do amount of the mixed solution circulating in the ditch tank can be adjusted quickly and accurately.
図は本発明のオキシデーションディッチにおける酸素供
給量制御装置の一実施例を示す説明図である。 １…ディッチ槽、３…循環路、４…流入路、５…流入
口、６…流出路、７…流出口、８…ロータ、９…可動ゲ
ート、10…採水管、11…フィルタ、12…ポンプ、13…UV
計、14…演算器、15…ロータ制御部、16…ゲート制御部FIG. 1 is an explanatory view showing an embodiment of the oxygen supply amount control device in the oxidation ditch of the present invention. 1 ... Ditch tank, 3 ... Circulation path, 4 ... Inflow path, 5 ... Inflow port, 6 ... Outflow path, 7 ... Outflow port, 8 ... Rotor, 9 ... Movable gate, 10 ... Water sampling pipe, 11 ... Filter, 12 ... Pump, 13 ... UV
Total, 14 ... Arithmetic unit, 15 ... Rotor control unit, 16 ... Gate control unit
Claims (1)
汚泥の流入口と硝化脱窒処理された混合液の流出口とを
設け、前記循環路の流入口下流位置に循環路に流入した
汚水及び活性汚泥の混合液を攪拌曝気する共に循環させ
るロータを設け、前記流出口にディッチ槽内の硝化脱窒
処理された混合液を流出路に溢流させる可動ゲートを設
けたオキシデーションディッチにおける酸素供給量制御
装置において、前記ディッチ槽に前記循環路の混合液を
採取する採水管を接続し、該採水管に、採取された混合
液の懸濁物を除去するフィルタと、混合液を常時採取す
るポンプと、NOx濃度を紫外線吸収法によって測定する
紫外線計とを夫々設け、該紫外線計にて測定されたNOx
濃度の測定値と設定値とを比較演算する演算器と、該演
算器にて比較演算された結果により、前記ロータの回転
を制御するロータ制御部及び可動ゲートの上下位置を制
御するゲート制御部とを備えたことを特徴とするオキシ
デーションディッチにおける酸素供給量制御装置。1. A ditch tank having a circulation path is provided with an inflow port for sewage and activated sludge and an outflow port for a nitrifying / denitrifying mixed liquid, and sewage flowing into the circulation line at a position downstream of the inflow port of the circulation line. And a rotor for circulating and agitating and aeration of the mixed liquid of activated sludge, and oxygen in the oxidation ditch provided with a movable gate for overflowing the nitrifying / denitrifying mixed liquid in the ditch tank to the outflow passage at the outlet. In the supply amount control device, a sampling pipe for collecting the mixed liquid in the circulation path is connected to the ditch tank, and a filter for removing a suspension of the collected mixed liquid and the mixed liquid are constantly collected in the sampling pipe. And a UV meter for measuring the NOx concentration by the UV absorption method, respectively, and NOx measured by the UV meter
A calculator for comparing and calculating the measured value of the concentration and a set value, and a rotor controller for controlling the rotation of the rotor and a gate controller for controlling the vertical position of the movable gate according to the result of the comparison and calculation by the calculator. And an oxygen supply amount control device in an oxidation ditch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61043796A JPH0720590B2 (en) | 1986-02-28 | 1986-02-28 | Oxygen supply controller in oxidation ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61043796A JPH0720590B2 (en) | 1986-02-28 | 1986-02-28 | Oxygen supply controller in oxidation ditch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62201695A JPS62201695A (en) | 1987-09-05 |
| JPH0720590B2 true JPH0720590B2 (en) | 1995-03-08 |
Family
ID=12673707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61043796A Expired - Lifetime JPH0720590B2 (en) | 1986-02-28 | 1986-02-28 | Oxygen supply controller in oxidation ditch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0720590B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7190397B2 (en) * | 2019-06-21 | 2022-12-15 | 株式会社Ｎｔｔファシリティーズ | sewage treatment equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115793A (en) * | 1984-06-29 | 1986-01-23 | Ebara Infilco Co Ltd | Treatment of organic waste water |
-
1986
- 1986-02-28 JP JP61043796A patent/JPH0720590B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62201695A (en) | 1987-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |