JPH06102195B2 - Method for controlling phosphorus concentration in wastewater - Google Patents
Method for controlling phosphorus concentration in wastewaterInfo
- Publication number
- JPH06102195B2 JPH06102195B2 JP1224352A JP22435289A JPH06102195B2 JP H06102195 B2 JPH06102195 B2 JP H06102195B2 JP 1224352 A JP1224352 A JP 1224352A JP 22435289 A JP22435289 A JP 22435289A JP H06102195 B2 JPH06102195 B2 JP H06102195B2
- Authority
- JP
- Japan
- Prior art keywords
- phosphorus
- coagulant
- wastewater
- phosphorus concentration
- amount
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims description 47
- 229910052698 phosphorus Inorganic materials 0.000 title claims description 47
- 239000011574 phosphorus Substances 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 44
- 239000002351 wastewater Substances 0.000 title claims description 13
- 239000000701 coagulant Substances 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000010802 sludge Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 9
- 230000007812 deficiency Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000031018 biological processes and functions Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004737 colorimetric analysis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring 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)
- Removal Of Specific Substances (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は水処理特に排水の処理に、化学凝集剤を用いて
処理水のリンを除去する処理方法又は生物的水処理法、
所謂活性汚泥法およびその各種変法において凝集剤を添
加して処理水のリンを除去する方法において、処理水の
リン濃度に応じた適量の凝集剤で排水中のリン除去を効
率よく行う方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a water treatment method, in particular a waste water treatment method, wherein a chemical coagulant is used to remove phosphorus in the treated water or a biological water treatment method.
Regarding a method for removing phosphorus in treated water by adding a flocculant in a so-called activated sludge method and various modified methods thereof, a method for efficiently removing phosphorus in wastewater with an appropriate amount of flocculant according to the phosphorus concentration of treated water .
生活、工業上からの排水中のリンを処理する方法として
は、従来、生物的脱リン作用を利用した所謂嫌気・好気
活性汚泥法が行われているが、生物的作用のみに依存す
ると排水中のBOD（生物学的酸素要求量）の濃度の変化
によって充分な脱リン機能が得られない場合があるの
で、現在はこの生物的脱リン作用によらず、凝集剤を併
用してリンの除去を行う活性汚泥法の各種の変法、例え
ば凝集剤添加循環式硝化脱窒法、凝集剤添加活性汚泥法
等も行われている。Conventionally, the so-called anaerobic / aerobic activated sludge method utilizing biological dephosphorization has been used as a method for treating phosphorus in wastewater from daily life and industry. Since there is a case where a sufficient dephosphorization function cannot be obtained due to a change in the concentration of BOD (biological oxygen demand) in the blood, at present, a coagulant is used in combination with a phosphorus depletion agent regardless of the biological dephosphorization effect. Various modified methods of the activated sludge method for removal, such as a circulation type nitrification denitrification method with a coagulant and an activated sludge method with a coagulant, are also used.
上記活性汚泥法に凝集剤の添加を併用した排水の脱リン
法においては、凝集剤の添加により発生汚泥量が増大す
る欠点があるため、下水処理場においては生物的な脱リ
ン法が適していると考えられている。しかし、生物的な
脱リン法では生物の必要とするBOD濃度が低下した場合
に、脱リン機能が低下してリン除去が不安定になる。そ
こで、この生物的な脱リン法に凝集剤による脱リン作用
を組み合せた方法が研究されたが、リンの含有の不安定
な処理用水にどの程度の凝集剤量を添加するかが非常に
困難な点であった。In the wastewater dephosphorization method in which the addition of the coagulant is added to the activated sludge method, there is a drawback that the amount of sludge generated is increased by the addition of the coagulant. Are believed to be present. However, in the biological dephosphorization method, when the BOD concentration required by the organism is reduced, the dephosphorization function is reduced and phosphorus removal becomes unstable. Therefore, a method that combines the biological dephosphorization method with the dephosphorization effect of a flocculant has been studied, but it is extremely difficult to determine how much flocculant to add to unstable treatment water containing phosphorus. That was a point.
この問題点を解決するには、生物的脱リンによる除去程
度を予測して適正な凝集剤量を添加するか、処理後の水
の処理結果を分析して、この値から適正な凝集剤の添加
量を定めるかの何れかの方法が考えられるが、前者の方
法においては、生物的脱リンの機構が十分に解明されて
いない現状では不可能であり、後者の方法においては、
水の処理結果の分析に約１時間程度の時間を要し、これ
より凝集剤添加の調整結果を得るまでに更にかなりの時
間を要し、流入処理時に水のリン濃度に応じた量を加え
ることはできなかった。また、活性汚泥を用いるプロセ
スに凝集剤を添加する場合にあっては、添加した凝集剤
によるリン除去効果の発現が活性汚泥中の凝集剤濃度の
上昇を持って行なわれると考えられたため、短時間の変
動に対して凝集剤注入量の変化でこれを抑制しようとす
る場合には膨大な量の凝集剤を増減しなければならず、
実際的ではないと考えられていた。To solve this problem, predict the degree of removal by biological dephosphorization and add an appropriate amount of coagulant, or analyze the treatment result of water after treatment and use this value to determine the appropriate coagulant. Either method of determining the addition amount is conceivable, but in the former method, it is impossible under the present circumstances where the mechanism of biological dephosphorization is not sufficiently understood, and in the latter method,
It takes about 1 hour to analyze the treatment result of water, and it takes a considerable time to obtain the adjustment result of the coagulant addition from this, and an amount corresponding to the phosphorus concentration of water is added at the time of inflow treatment. I couldn't do that. In addition, when a coagulant was added to the process using activated sludge, it was considered that the phosphorus removal effect of the added coagulant was expressed with an increase in the concentration of the coagulant in the activated sludge. In order to suppress this by changing the coagulant injection amount with respect to time fluctuation, it is necessary to increase or decrease the enormous amount of coagulant,
It was considered impractical.
本発明は、凝集剤の添加による水処理法において、適切
な注入位置を選択することにより、処理水のリンの濃度
から、プロセス全体のリン除去量の過不足値を予測して
適正の量の凝集剤を添加しプロセスのリン除去量の過不
足を補うことにより処理水のリン濃度を一定に制御する
方法を提供することを目的とするものである。The present invention, in the water treatment method by the addition of a coagulant, by selecting an appropriate injection position, from the concentration of phosphorus in the treated water, predict the excess or deficiency value of the phosphorus removal amount of the entire process, the appropriate amount. It is an object of the present invention to provide a method for controlling the phosphorus concentration of treated water at a constant level by adding a flocculant to compensate for the excess or deficiency of the phosphorus removal amount in the process.
本発明は排水中の溶解性リンの除去を、化学凝集作用、
または生物的作用と化学凝集作用との併用によって行う
水処理プロセスにおいて、添加する凝集剤量を、リン検
出器により検出された処理水のリン濃度値の変化に基づ
いて本処理水プロセスのリン除去量の過不足予測値を算
定し、リン除去量の過不足をなくすよう凝集剤添加量を
制御することにより排水のリン濃度の制御を適正に行う
方法である。The present invention removes soluble phosphorus in wastewater by chemical coagulation,
Alternatively, in a water treatment process that uses both biological action and chemical flocculation action, the amount of flocculant to be added can be adjusted according to the change in the phosphorus concentration value of the treated water detected by the phosphorus detector. This is a method for appropriately controlling the phosphorus concentration of wastewater by calculating an estimated amount of excess or deficiency and controlling the amount of coagulant added so as to eliminate the excess or deficiency of the amount of phosphorus removed.
本発明の排水は主として溶解性リンの多い生活排水に使
用されるが、その他の排水例えば工業排水にも利用する
ことができる。The wastewater of the present invention is mainly used for domestic wastewater containing a large amount of soluble phosphorus, but can be used for other wastewater such as industrial wastewater.
本発明の方法は、排水の化学凝集作用または、生物的作
用と化学凝集作用を併用した排水処理プロセスに使用さ
れる。特に、生物的作用と化学凝集作用を併用した排水
処理プロセスに適用すれば一層良好な効果が得られる。INDUSTRIAL APPLICABILITY The method of the present invention is used for a wastewater treatment process that combines the chemical flocculation action of wastewater or a biological action and a chemical flocculation action. In particular, a better effect can be obtained by applying it to a wastewater treatment process that combines a biological action and a chemical coagulation action.
本発明の方法は、排水処理システムの最終段の処理水に
リン検出器例えば比色分析法、イオン電極法又はプラズ
マ発光分析法による検出器、特に比色分析法による検出
器を用いて、制御周期初めのリン濃度（P0）を測定し、
一定時間（ｂ）後のリン濃度（P1）を測定し、リン濃度
の一定時間の変化率（ｄ）ｄ＝（P1-P0）/bを算出し、
この変化率を基にして、遡り予測時間Ｃのリン濃度の予
測値（Pc）を変化率ｄと予測時間Ｃの関数Pc＝ｆ（d,
c）により算出する。関数ｆ（d,c）が最も単純な場合は
Pc＝P1＋ｄ・ｃとなる。The method of the present invention is controlled by using a phosphorus detector such as a colorimetric method, an ion electrode method or a plasma emission analysis method, especially a colorimetric method for the final treated water in the wastewater treatment system. Measure the phosphorus concentration (P 0 ) at the beginning of the cycle,
The phosphorus concentration (P 1 ) after a certain period of time (b) was measured, and the rate of change (d) d = (P 1 −P 0 ) / b of the phosphorus concentration during a certain period of time was calculated,
Based on this rate of change, the predicted value (Pc) of the phosphorus concentration at the retrospective prediction time C is calculated as a function of the rate of change d and the prediction time C Pc = f (d,
Calculate according to c). If the function f (d, c) is the simplest,
Pc = P 1 + d · c.
次に、以上の如くして得られた算出値（Pc）と制御の目
標とする処理リン濃度目標値（Ｓ）の差（ｅ）ｅ＝Pc−
Ｓを算出し、この差（ｅ）に適合した（ｅ）の関数ｇ
（ｅ）で算出されるリン凝集剤、例えば硫酸アルミニウ
ムの適量（ｉ）＝ｇ（ｅ）を増減して注入する。Next, the difference (e) e = Pc- between the calculated value (Pc) obtained as described above and the control target phosphorus concentration value (S).
S is calculated and the function g of (e) adapted to this difference (e)
An appropriate amount (i) = g (e) of the phosphorus coagulant, such as aluminum sulfate, calculated in (e) is increased or decreased and injected.
このリン濃度検出、演算、凝集剤の注入量の増減は全て
自動制御によって行うことができる。This phosphorus concentration detection, calculation, and increase / decrease of the coagulant injection amount can all be performed by automatic control.
また、活性汚泥を用いるプロセスに凝集剤を添加する場
合にあっては、凝集剤の注入位置を活性汚泥処理の最終
段から最終固液分離装置にいたる流路内で、かつ添加し
た凝集剤が十分な攪拌混合を受けることができる位置と
することによって、活性汚泥中の凝集剤濃度の変化によ
らず、注入凝集剤濃度の変化に応じて処理水リン濃度の
制御を行なうことができ、上記制御手段を適用すること
ができる。When adding a coagulant to the process using activated sludge, the coagulant injection position should be within the flow path from the final stage of activated sludge treatment to the final solid-liquid separation device, and By setting the position where sufficient stirring and mixing can be performed, the phosphorus concentration in the treated water can be controlled according to the change in the concentration of the coagulant injected, regardless of the change in the concentration of the coagulant in the activated sludge. Control means can be applied.
以上の本発明の方法を用いることによって、流入される
排水のリン濃度の変化に即応した量の凝集剤を注入する
ことができ、また、生物的作用と化学的作用を併用する
場合においても、生物の脱リン機能の高低によっても凝
集剤の注入量が制御できる。By using the method of the present invention as described above, it is possible to inject an amount of the coagulant that immediately responds to changes in the phosphorus concentration of the inflowing wastewater, and also in the case of using a biological action and a chemical action together, The injection amount of the flocculant can be controlled also by the level of the dephosphorization function of the organism.
次に本発明の実施例を挙げ、本発明を更に詳細に説明す
るが、本発明はこの実施例に限定されるものではないこ
とは言うまでもない。Next, the present invention will be described in more detail with reference to examples of the present invention, but it goes without saying that the present invention is not limited to these examples.
容積200m3の曝気槽（１）に凝集剤（硫酸アルミニウ
ム）注入点（２）を有し、最終沈澱槽（３）に検出点
（４）及び処理水流出口（５）を備えた、排水処理シス
テムにおいて、検出点より採取された検水を比色式のリ
ン検出器（６）により、リンをモニターし、この濃度信
号をプログラム式演算制御器（横河電気（株）製,SCMS
型）（７）により凝集剤注入ポンプ（８）の注入量を凝
集剤予測量を注入するようにポンプの稼動を制御するポ
ンプ制御信号を凝集剤注入ポンプ（８）に送り、同ポン
プの凝集剤貯槽（９）から制御された量の凝集剤を凝集
剤注入点（２）に送り込む排水処理システム（第１図で
示す）において、流入水を480m3/dで６月初めから10月
の終りまでの各時期I,II,III（Ａ−1,A−2,B−1,B−２
及びＣ）の流入水（INF）を流し、流入水及び処理後の
処理水（EFF）の溶解性リン（Ｐ−Ｄ）、総窒素（Ｔ−
Ｎ）、生物学的酸素要求量（BOD）並びに処理に用いた
凝集剤（硫酸アルミニウム）の注入率を測定した（第１
表参照）。これを流入水と処理水とのリン濃度について
図で示すと第２図の通りである。Wastewater treatment with a 200 m 3 aeration tank (1) having a coagulant (aluminum sulfate) injection point (2) and a final precipitation tank (3) having a detection point (4) and a treated water outlet (5) In the system, the sampled water sampled from the detection point is monitored for phosphorus by a colorimetric phosphorus detector (6), and this concentration signal is monitored by a programmable arithmetic controller (Yokogawa Electric Corp., SCMS).
Type) (7) sends a pump control signal for controlling the operation of the coagulant injection pump (8) so as to inject the coagulant injection pump (8) to the coagulant injection pump (8), and the coagulant injection pump (8) is agglomerated. In the wastewater treatment system (shown in Fig. 1) that sends a controlled amount of coagulant from the agent storage tank (9) to the coagulant injection point (2), the inflow of 480 m 3 / d from early June to October Each period until the end I, II, III (A-1, A-2, B-1, B-2
And influent water (INF) of C), and the soluble phosphorus (PD) of the influent water and the treated water (EFF) after treatment, total nitrogen (T-
N), biological oxygen demand (BOD), and the injection rate of the coagulant (aluminum sulfate) used for the treatment were measured (No. 1)
See table). This is shown in FIG. 2 when the phosphorus concentration of the inflow water and the treated water is shown in the figure.
〔発明の効果〕 本発明は生物の脱リン能力の相違、その他の天然環境の
差異があっても、常に適正な量の凝集剤を供給できるか
ら、最少限の凝集剤の注入で有効に排水中のリンを除く
ことを可能にする方法である。従って排水による閉鎖性
水域へのリンの負荷量削減に極めて有用な発明である。 EFFECTS OF THE INVENTION The present invention can always supply an appropriate amount of coagulant even if there is a difference in dephosphorization ability of organisms and other differences in the natural environment. It is a method that makes it possible to remove phosphorus inside. Therefore, it is an extremely useful invention for reducing the phosphorus load on closed water areas due to drainage.
【図面の簡単な説明】 第１図は本発明の排水処理システムの工程図、第２図
は、実施例の流入水と処理水とのリン濃度を表わした図
面である。 図中、１は曝気槽、２は凝集剤注入点、３は最終沈澱
槽、４は検出点、５は排水処理出口、６はリン検出器、
７は凝集剤注入量制御装置、８は凝集剤注入ポンプ、９
は凝集剤貯槽を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram of a wastewater treatment system of the present invention, and FIG. 2 is a diagram showing phosphorus concentrations in inflow water and treated water according to an embodiment. In the figure, 1 is an aeration tank, 2 is a coagulant injection point, 3 is a final precipitation tank, 4 is a detection point, 5 is a wastewater treatment outlet, 6 is a phosphorus detector,
7 is a flocculant injection amount control device, 8 is a flocculant injection pump, 9
Indicates a flocculant storage tank.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−54283（ＪＰ，Ａ) 特開 昭47−36548（ＪＰ，Ａ) 特開 昭56−102991（ＪＰ，Ａ) 特公 昭59−8437（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-54283 (JP, A) JP-A-47-36548 (JP, A) JP-A-56-102991 (JP, A) JP-B-59- 8437 (JP, B2)
Claims (2)
用、または生物的作用と化学凝集作用との併用によって
行う水処理プロセスにおいて、添加する凝集剤量を、リ
ン検出器により検出された処理水リン濃度値の変化に基
づいて本水処理プロセスのリン除去量の過不足予測値を
算定し、リン除去量の過不足を失くすよう制御すること
を特徴とする排水のリン濃度制御方法。1. A phosphorus detector detects the amount of coagulant to be added in a water treatment process in which soluble phosphorus in wastewater is removed by chemical coagulation or a combination of biological and chemical coagulation. Phosphorus concentration control of wastewater, characterized by calculating an estimated excess or deficiency of phosphorus removal amount of the main water treatment process based on the change of phosphorus concentration value of the treated water, and performing control so as to lose the excess or deficiency of phosphorus removal amount. Method.
種の変法と凝集剤との併用プロセスに対して適用する場
合にあって、凝集剤の注入位置を活性汚泥処理の最終段
から最終固液分離装置にいたる流路内で、かつ添加した
凝集剤が十分な攪拌混合を受けることができる位置とす
る請求項１の排水のリン濃度制御方法。2. When applying the phosphorus concentration control method to an activated sludge method or a combined process of various modifications thereof and a coagulant, the coagulant injection position is set from the final stage of the activated sludge treatment. 2. The method for controlling phosphorus concentration in wastewater according to claim 1, wherein the added coagulant is located in a flow path leading to the final solid-liquid separator and at a position where it can be sufficiently stirred and mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1224352A JPH06102195B2 (en) | 1989-09-01 | 1989-09-01 | Method for controlling phosphorus concentration in wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1224352A JPH06102195B2 (en) | 1989-09-01 | 1989-09-01 | Method for controlling phosphorus concentration in wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0389993A JPH0389993A (en) | 1991-04-15 |
| JPH06102195B2 true JPH06102195B2 (en) | 1994-12-14 |
Family
ID=16812424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1224352A Expired - Lifetime JPH06102195B2 (en) | 1989-09-01 | 1989-09-01 | Method for controlling phosphorus concentration in wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06102195B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4365512B2 (en) * | 2000-06-12 | 2009-11-18 | 株式会社東芝 | Sewage treatment system and measurement system |
| JP4543656B2 (en) * | 2003-10-21 | 2010-09-15 | 栗田工業株式会社 | Water treatment method and water treatment apparatus |
| FI119148B (en) * | 2007-07-05 | 2008-08-15 | Biolan Oy | Apparatus and its use for precipitation of phosphorus from wastewater |
| JP5467837B2 (en) * | 2009-10-09 | 2014-04-09 | 三菱電機株式会社 | Control device for biological water treatment equipment |
| JP5575211B2 (en) * | 2012-11-29 | 2014-08-20 | 三菱電機株式会社 | Control device for biological water treatment equipment |
| JP5791762B2 (en) * | 2014-05-26 | 2015-10-07 | 三菱電機株式会社 | Control device for biological water treatment equipment |
| JP5826328B2 (en) * | 2014-05-26 | 2015-12-02 | 三菱電機株式会社 | Control device for biological water treatment equipment |
| JP5791763B2 (en) * | 2014-05-26 | 2015-10-07 | 三菱電機株式会社 | Control device for biological water treatment equipment |
| CN109467283B (en) * | 2018-12-25 | 2020-09-08 | 湖南智水环境工程有限公司 | Sewage treatment equipment suitable for multi-household domestic sewage treatment |
| JP6866055B2 (en) * | 2019-02-20 | 2021-04-28 | 三菱電機株式会社 | Water treatment equipment and water treatment method |
-
1989
- 1989-09-01 JP JP1224352A patent/JPH06102195B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0389993A (en) | 1991-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |