JPH06126293A - Method for controlling dissolved oxygen in aeration tank - Google Patents
Method for controlling dissolved oxygen in aeration tankInfo
- Publication number
- JPH06126293A JPH06126293A JP4274303A JP27430392A JPH06126293A JP H06126293 A JPH06126293 A JP H06126293A JP 4274303 A JP4274303 A JP 4274303A JP 27430392 A JP27430392 A JP 27430392A JP H06126293 A JPH06126293 A JP H06126293A
- Authority
- JP
- Japan
- Prior art keywords
- dissolved oxygen
- aeration tank
- raw water
- tank
- oxygen concentration
- 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
Links
- 238000005273 aeration Methods 0.000 title claims abstract description 43
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 38
- 239000001301 oxygen Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims description 5
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 5
- 239000005416 organic matter Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003786 synthesis reaction 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水や工場廃水等の曝
気に際し、曝気槽内の溶存酸素（以下、ＤＯという）濃
度の安定化を図る曝気槽溶存酸素制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration tank dissolved oxygen control method for stabilizing the dissolved oxygen (hereinafter referred to as DO) concentration in the aeration tank during aeration of sewage or industrial wastewater.
【０００２】[0002]
【従来の技術】有機物を含む廃水を曝気していると、好
気性のバクテリヤや原生動物等の微生物が繁殖し、これ
らがゼラチン状の汚泥となって沈澱してくる。この汚泥
は、有機物を吸着し、また、その生物化学的な作用で有
機物の酸化を促進することから、活性汚泥と呼ばれてい
る。したがって、生成した汚泥の一部を原水に返送しな
がら曝気を行うと、原水中の有機物の一部は炭酸ガスや
水の状態まで分解され、また残りの部分は新しい汚泥と
なって沈澱する。かかる方法を用いて廃水中の有機物を
除去する方法が活性汚泥法である。2. Description of the Related Art When aerating wastewater containing organic matter, microorganisms such as aerobic bacteria and protozoa propagate, and these precipitate as gelatinous sludge. This sludge is called activated sludge because it adsorbs organic matter and promotes the oxidation of organic matter by its biochemical action. Therefore, when aeration is performed while returning a part of the generated sludge to the raw water, a part of the organic matter in the raw water is decomposed into carbon dioxide and water, and the remaining part is deposited as new sludge. The activated sludge method is a method for removing organic matter in wastewater using such a method.
【０００３】活性汚泥方法は、当初下水処理法として普
及してきたが、今日では工場廃水の処理にも広く用いら
れている。The activated sludge method was initially widespread as a sewage treatment method, but is now widely used for treating industrial wastewater.
【０００４】ところで、活性汚泥法による処理において
は、曝気槽内のＤＯ管理が最も重要な課題となる。すな
わち、曝気槽内のＤＯが不足すると、槽内の好気性微生
物の酸素呼吸および細胞合成が阻害され汚泥の死滅が進
み、有機物の分解能力が低下する。逆にＤＯが過剰にな
ると、曝気槽内の攪拌力が強まり、活性汚泥のフロック
を破壊するため、後処理設備である沈降槽においてフロ
ックの沈降性が悪くなり、フロックの系外流出の発生や
固液分離が十分にできなくなる。このため、曝気槽への
返送汚泥濃度が下がり、結果として有機物の分解能力の
低下に繋がる。By the way, in the treatment by the activated sludge method, DO management in the aeration tank is the most important issue. That is, when DO in the aeration tank is insufficient, oxygen respiration and cell synthesis of aerobic microorganisms in the tank are inhibited, sludge is killed, and the ability of decomposing organic substances is reduced. On the contrary, if the DO becomes excessive, the agitation force in the aeration tank is increased and the flocs of the activated sludge are destroyed, so that the sedimentation of the flocs in the sedimentation tank, which is a post-treatment facility, deteriorates, and the outflow of the flocs to the outside of the system occurs Solid-liquid separation cannot be performed sufficiently. For this reason, the concentration of sludge returned to the aeration tank is reduced, and as a result, the ability to decompose organic substances is reduced.
【０００５】一般には、たとえば散気管方式やエジェク
ター方式等の空気供給装置を設置し、原水の最大汚濁負
荷量に合わせて空気を供給しているため、通常の操業状
態では、曝気槽内のＤＯ濃度は高くなり、過曝気状態と
なる。これが、曝気槽の操業不安定化および動力費のア
ップを招いている。Generally, an air supply device such as an air diffuser system or an ejector system is installed to supply air in accordance with the maximum pollution load amount of raw water. Therefore, in a normal operating condition, the DO in the aeration tank is The concentration becomes high and becomes over-aerated. This leads to instability in the operation of the aeration tank and increase in power costs.
【０００６】そこで、曝気槽の操業安定化およびエネル
ギーコストの低減を図るために、従来は、溶存酸素濃度
計（以下、ＤＯ濃度計という）または酸化還元電位計
（以下、ＯＲＰ計という）等を用いて槽内状況を測定
し、ＰＩＤ制御やフィードバック制御を用いて、ブロワ
ーの回転数を変化させ、ＤＯ濃度を制御している。Therefore, in order to stabilize the operation of the aeration tank and reduce the energy cost, conventionally, a dissolved oxygen concentration meter (hereinafter referred to as DO concentration meter) or an oxidation-reduction potentiometer (hereinafter referred to as ORP meter) is used. The situation inside the tank is measured by using it, and the rotation speed of the blower is changed using PID control or feedback control to control the DO concentration.
【０００７】[0007]
【発明が解決しようとする課題】ところが、上記従来技
術では、原水の負荷変動が考慮されていないために、原
水の負荷変動に対する追従性の遅れがあり、安定したＤ
Ｏ管理ができない。However, in the above-mentioned prior art, since the load fluctuation of the raw water is not taken into consideration, there is a delay in the followability to the load fluctuation of the raw water, and a stable D
O management is not possible.
【０００８】そこで、本発明の課題は、原水の負荷変動
に対する追従性を向上させ、適正なるＤＯ制御を可能と
することにある。[0008] Therefore, an object of the present invention is to improve the followability to the load fluctuation of the raw water and to enable the appropriate DO control.
【０００９】[0009]
【課題を解決するための手段】上記課題は、原水を受け
入れて連続的に曝気処理する曝気槽内における溶存酸素
濃度を、溶存酸素濃度計または酸化還元電位計のうち少
なくとも一方を用いて連続的に測定し、他方で曝気槽内
に流入前の原水の生物化学的酸素要求量または化学的酸
素要求量の測定値と流量とを乗算して負荷量を求め、前
記現溶存酸素濃度と負荷量とに基づいて、曝気槽内溶存
酸素濃度を予測しながら、目標溶存酸素濃度となるよう
に、曝気槽内への空気吹込み量を制御することで解決で
きる。[Means for Solving the Problems] The above problem is to continuously measure the dissolved oxygen concentration in an aeration tank that receives raw water and continuously performs aeration by using at least one of a dissolved oxygen concentration meter and a redox electrometer. On the other hand, on the other hand, the load is obtained by multiplying the biochemical oxygen demand of the raw water before flowing into the aeration tank or the measured value of the chemical oxygen demand and the flow rate to obtain the load, and the current dissolved oxygen concentration and load. Based on the above, it is possible to solve the problem by predicting the dissolved oxygen concentration in the aeration tank and controlling the amount of air blown into the aeration tank so as to achieve the target dissolved oxygen concentration.
【００１０】[0010]
【作用】本発明によれば、ＤＯ計またはＯＲＰ計による
曝気槽内における現在の溶存酸素濃度に対して、流入す
る原水の生物化学的酸素要求量測定値または化学的酸素
要求量測定値と流量測定値とを乗算して得られた原水の
負荷量を反映させて、曝気槽内の溶存酸素濃度を予測
し、その予測値に基づいて、目標溶存酸素濃度となるよ
うに空気投入量を制御するので、原水の負荷変動に対し
ても、安定したＤＯ管理を行うことができ、操業の安定
化およびエネルギーコストの低減を図ることができる。According to the present invention, the biochemical oxygen demand measurement value or the chemical oxygen demand measurement value and the flow rate of the inflowing raw water with respect to the current dissolved oxygen concentration in the aeration tank by the DO meter or the ORP meter The dissolved oxygen concentration in the aeration tank is predicted by reflecting the load amount of raw water obtained by multiplying it with the measured value, and based on the predicted value, the air input is controlled to reach the target dissolved oxygen concentration. As a result, stable DO management can be performed even with changes in the load of raw water, and it is possible to stabilize operations and reduce energy costs.
【００１１】[0011]
【実施例】以下、本発明を図面に基づきさらに具体的に
説明する。図１は本発明による曝気槽ＤＯ制御フローを
示す図で、１は曝気槽、２はこの曝気槽に流入する原水
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings. FIG. 1 is a diagram showing an aeration tank DO control flow according to the present invention, where 1 is an aeration tank and 2 is raw water flowing into this aeration tank.
【００１２】曝気槽１内には、ＤＯ計３およびＯＲＰ計
４が設けられており、曝気槽１内の溶存酸素濃度を連続
的に測定するようになっている。溶存酸素濃度はＤＯ計
３またはＯＲＰ計４の一方のみを用いて測定することも
できる。A DO meter 3 and an ORP meter 4 are provided in the aeration tank 1 so that the dissolved oxygen concentration in the aeration tank 1 can be continuously measured. The dissolved oxygen concentration can also be measured using only one of the DO meter 3 and the ORP meter 4.
【００１３】一方、曝気槽１流入前の原水２に対して
は、生物化学的酸素要求量連続測定器５（以下、ＢＯＤ
計という）および流量計６が設けられており、これらの
測定値は乗算器７により乗算されてファジィコントロー
ラー８にアナログ信号で入力するようになっている。乗
算器７では、ＢＯＤ計５により測定されたＢＯＤ濃度と
流量計６により測定された流量とを乗算することによ
り、原水の負荷量が求められる。On the other hand, for the raw water 2 before entering the aeration tank 1, the biochemical oxygen demand continuous measuring device 5 (hereinafter referred to as BOD
(Referred to as a meter) and a flow meter 6 are provided, and these measured values are multiplied by a multiplier 7 and input to the fuzzy controller 8 as an analog signal. The multiplier 7 multiplies the BOD concentration measured by the BOD meter 5 and the flow rate measured by the flow meter 6 to obtain the load amount of raw water.
【００１４】なお、ＢＯＤ計５としては、ダイオーエン
ジニアリング社製「ＢＯＤ−Ｍ３」を用いることがで
き、この場合におけるＢＯＤの測定方法は下記の通りで
ある。 （１）２つのＤＯ計２０，２１を用いて、バイオリアク
ター２２の入側と出側の溶存酸素濃度を測定する。 （２）その差（ＤＯ２０−ＤＯ２１）がたとえば３ppm
となるように、コンピューター２３により希釈水ポンプ
２４と原水ポンプ２５を制御し、それぞれの量を調節す
る。 （３）以上の制御を行い、バイオリアクター２２の微生
物の活性を一定の状態にし、保持することにより、原水
希釈率ならびに測定した溶存酸素消費量の差および温度
から、原水の生物化学的に分解可能な成分に関する汚濁
度が求められる。As the BOD meter 5, "BOD-M3" manufactured by Daio Engineering Co., Ltd. can be used, and the BOD measuring method in this case is as follows. (1) The dissolved oxygen concentration on the inlet side and the outlet side of the bioreactor 22 is measured using the two DO meters 20 and 21. (2) The difference (DO20-DO21) is, for example, 3 ppm
The dilution water pump 24 and the raw water pump 25 are controlled by the computer 23 so that the respective amounts are adjusted. (3) By performing the above control to keep the microbial activity of the bioreactor 22 constant and maintaining it, the raw water is biochemically decomposed from the raw water dilution rate and the measured difference in dissolved oxygen consumption and temperature. Pollution degree for possible ingredients is required.
【００１５】そして、この汚濁度はＪＩＳで規定された
ＢＯＤ5 （５日間の溶存酸素消費量）と比較測定および
装置の検定を行うことにより、コンピューター２３で直
接ＢＯＤ5 値として求めることができるとともにその値
をプリンター２６から出力することができる。この基本
的な考えは、特公平２−52825 号公報に開示されてい
る。本発明では、この方式を採用することにより、原水
のＢＯＤ濃度を短時間に測定し、その原水の負荷変動を
把握できる。The pollution degree can be directly obtained as a BOD 5 value by the computer 23 by carrying out a comparative measurement with BOD 5 (dissolved oxygen consumption amount for 5 days) defined by JIS and a test of the apparatus. The value can be output from the printer 26. This basic idea is disclosed in Japanese Examined Patent Publication No. 2-52825. In the present invention, by adopting this method, the BOD concentration of raw water can be measured in a short time, and the load fluctuation of the raw water can be grasped.
【００１６】なお、本実施例では、原水の負荷量を求め
るのに、ＢＯＤ濃度を測定したが、ＣＯＤ濃度であって
もよい。両者を併用することもできる。In the present embodiment, the BOD concentration was measured to determine the load amount of raw water, but the COD concentration may be used. Both can be used together.
【００１７】ファジィコントローラー８では、ファジィ
推論に基づいて、曝気槽１内に原水が流入する前に、次
の時点の曝気槽１内のＤＯ濃度を予測し、その予測値に
基づいて、曝気槽１内ＤＯ濃度が最適になるようブロワ
ーや循環ポンプなどの空気供給装置１１のモーター回転
数設定値を求め、変換器９を介してモーター回転数を制
御するインバーター１０に制御出力を与えて、空気供給
装置１１の回転数を制御するようになっている。The fuzzy controller 8 predicts the DO concentration in the aeration tank 1 at the next time based on the fuzzy inference before raw water flows into the aeration tank 1, and based on the predicted value, the aeration tank 1 The motor rotation speed set value of the air supply device 11 such as a blower or a circulation pump is obtained so that the DO concentration in 1 becomes optimum, and the control output is given to the inverter 10 for controlling the motor rotation speed via the converter 9, The number of rotations of the supply device 11 is controlled.
【００１８】ところで、一般に活性汚泥処理における酸
素の利用に際しては、次記の関係を有する。 Ｏ2 ＝a'Ｌｒ×b'Ｓ ……（２） ここに、Ｏ2 ：必要酸素量（kg／日） a' ：除去ＢＯＤのうち増殖エネルギー供給のために利
用される割合 Ｌｒ：除去ＢＯＤ量（kg／日） b' ：汚泥の自己酸化係数（kg／kg・日） Ｓ ：曝気槽内の活性汚泥量（kg） この（２）式において、現在の曝気槽内の活性汚泥量Ｓ
は曝気槽の容量と濃度測定によって求めることができ、
さらに係数ａおよびｂは汚泥の種類によって定まり、Ｌ
ｒは目標のＢＯＤ除去量であるために、必要な酸素量Ｏ
2 は、演算によって求めることができる。この必要酸素
量はブロワーの回転数と関係があるので、前述のよう
に、原水の負荷量および曝気槽内における現ＤＯ濃度に
基づいて、ブロワーの回転数制御を行うことにより、安
定した曝気槽での運転が可能となるとともに、最小限の
空気量によって、したがってブロワーの運転動力費を低
減した状態での曝気処理を行うことができる。By the way, generally, in utilizing oxygen in activated sludge treatment, the following relations are provided. O 2 = a′Lr × b ′S (2) where, O 2 : required oxygen amount (kg / day) a ′: proportion of removed BOD used for supplying growth energy Lr: removed BOD Volume (kg / day) b ': Auto-oxidation coefficient of sludge (kg / kg · day) S: Volume of activated sludge in aeration tank (kg) In this equation (2), the current volume of activated sludge in the aeration tank S
Can be determined by measuring the volume and concentration of the aeration tank,
Furthermore, the coefficients a and b are determined by the type of sludge, and L
Since r is the target BOD removal amount, the required oxygen amount O
2 can be calculated. Since the required oxygen amount is related to the rotation speed of the blower, as described above, by controlling the rotation speed of the blower based on the load amount of raw water and the current DO concentration in the aeration tank, a stable aeration tank can be obtained. It is possible to carry out the aeration process with a minimum amount of air and therefore with a reduced operating power cost of the blower.
【００１９】ファジィコントローラー８に対しては、フ
ァジィ推論を行うための条件が、ルール関数・メンバー
関数として予め入力されている。Conditions for performing fuzzy inference are input in advance to the fuzzy controller 8 as rule functions and member functions.
【００２０】（実験例）本発明に係るファジィ制御を実
施した場合には、図２に示すように、安定したＤＯ制御
が可能となるが、ファジィ制御を実施しなかった場合に
は、図３から明らかなように、ＤＯ値にかなりのバラツ
キが生ずることとなる。(Experimental example) When the fuzzy control according to the present invention is carried out, stable DO control becomes possible, as shown in FIG. 2, but when the fuzzy control is not carried out, FIG. As is clear from the above, considerable variations will occur in the DO value.
【００２１】[0021]
【発明の効果】以上の通り、本発明によれば、原水の負
荷変動に対する追従性に優れるため、最適なＤＯ制御が
可能となり、操業の安定化およびエネルギーコストの低
減が図れる。As described above, according to the present invention, since the followability to the load fluctuation of the raw water is excellent, the optimum DO control can be performed, the operation can be stabilized and the energy cost can be reduced.
【図１】本発明による曝気槽ＤＯ制御フローを示す図で
ある。FIG. 1 is a diagram showing a control flow of an aeration tank DO according to the present invention.
【図２】ＢＯＤの測定方法を説明する図である。FIG. 2 is a diagram illustrating a method of measuring BOD.
【図３】本発明に従ってファジィ制御を実施した場合の
ＤＯ値の変化を示す図である。FIG. 3 is a diagram showing a change in a DO value when fuzzy control is performed according to the present invention.
【図４】ファジィ制御を実施しなかった場合のＤＯ値の
変化を示す図である。FIG. 4 is a diagram showing a change in a DO value when fuzzy control is not performed.
１…曝気槽、２…原水、３…ＤＯ計、４…ＯＲＰ計、５
…ＢＯＤ計、６…流量計、７…乗算器、８…ファジィコ
ントローラー、９…変換器、１０…インバーター、１１
…空気供給装置。1 ... Aeration tank, 2 ... Raw water, 3 ... DO meter, 4 ... ORP meter, 5
... BOD meter, 6 ... Flowmeter, 7 ... Multiplier, 8 ... Fuzzy controller, 9 ... Converter, 10 ... Inverter, 11
… Air supply device.
Claims (1)
気槽内における溶存酸素濃度を、溶存酸素濃度計または
酸化還元電位計のうち少なくとも一方を用いて連続的に
測定し、 他方で曝気槽内に流入前の原水の生物化学的酸素要求量
または化学的酸素要求量の測定値と流量とを乗算して負
荷量を求め、 前記現溶存酸素濃度と負荷量とに基づいて、曝気槽内溶
存酸素濃度を予測しながら、目標溶存酸素濃度となるよ
うに、曝気槽内への空気吹込み量を制御することを特徴
とする曝気槽溶存酸素制御方法。1. A dissolved oxygen concentration in an aeration tank that receives raw water and continuously performs aeration treatment is continuously measured using at least one of a dissolved oxygen concentration meter and a redox electrometer, and the other is an aeration tank. The biochemical oxygen demand or the measured value of the chemical oxygen demand of the raw water before inflow is multiplied by the flow rate to obtain the load amount, and based on the current dissolved oxygen concentration and the load amount, in the aeration tank A method for controlling dissolved oxygen in an aeration tank, which comprises controlling the amount of air blown into the aeration tank so as to achieve a target dissolved oxygen concentration while predicting the dissolved oxygen concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4274303A JPH06126293A (en) | 1992-10-13 | 1992-10-13 | Method for controlling dissolved oxygen in aeration tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4274303A JPH06126293A (en) | 1992-10-13 | 1992-10-13 | Method for controlling dissolved oxygen in aeration tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06126293A true JPH06126293A (en) | 1994-05-10 |
Family
ID=17539767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4274303A Pending JPH06126293A (en) | 1992-10-13 | 1992-10-13 | Method for controlling dissolved oxygen in aeration tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06126293A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002177980A (en) * | 2000-12-15 | 2002-06-25 | Meidensha Corp | Fuzzy controller for activated sludge treatment and method for the same |
| JP2009154060A (en) * | 2007-12-25 | 2009-07-16 | Fuji Clean Kogyo Kk | Water quality monitoring system |
| WO2020183577A1 (en) | 2019-03-11 | 2020-09-17 | 株式会社 ゴーダ水処理技研 | Testing method for wastewater treatment facility |
| CN115028258A (en) * | 2022-06-28 | 2022-09-09 | 华自科技股份有限公司 | A method for controlling dissolved oxygen concentration in a biological aeration tank and related components |
-
1992
- 1992-10-13 JP JP4274303A patent/JPH06126293A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002177980A (en) * | 2000-12-15 | 2002-06-25 | Meidensha Corp | Fuzzy controller for activated sludge treatment and method for the same |
| JP2009154060A (en) * | 2007-12-25 | 2009-07-16 | Fuji Clean Kogyo Kk | Water quality monitoring system |
| WO2020183577A1 (en) | 2019-03-11 | 2020-09-17 | 株式会社 ゴーダ水処理技研 | Testing method for wastewater treatment facility |
| CN113518764A (en) * | 2019-03-11 | 2021-10-19 | 江田水处理技研株式会社 | Test method for wastewater treatment facility |
| US11945739B2 (en) | 2019-03-11 | 2024-04-02 | Gohda Water Treatment Technology Co., Inc. | Testing method for wastewater treatment facility |
| CN115028258A (en) * | 2022-06-28 | 2022-09-09 | 华自科技股份有限公司 | A method for controlling dissolved oxygen concentration in a biological aeration tank and related components |
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