JPH01168308A - Control of coagulant injection in water filtering plant - Google Patents
Control of coagulant injection in water filtering plantInfo
- Publication number
- JPH01168308A JPH01168308A JP32375487A JP32375487A JPH01168308A JP H01168308 A JPH01168308 A JP H01168308A JP 32375487 A JP32375487 A JP 32375487A JP 32375487 A JP32375487 A JP 32375487A JP H01168308 A JPH01168308 A JP H01168308A
- Authority
- JP
- Japan
- Prior art keywords
- injection rate
- floc
- injection
- coagulant
- flocculant
- 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
- 239000007924 injection Substances 0.000 title claims abstract description 73
- 238000002347 injection Methods 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000000701 coagulant Substances 0.000 title abstract description 10
- 238000001914 filtration Methods 0.000 title description 2
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims description 15
- 238000005189 flocculation Methods 0.000 claims description 9
- 230000016615 flocculation Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 abstract 4
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 12
- 230000003247 decreasing effect Effects 0.000 description 5
- 244000144992 flock Species 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012899 standard injection Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は原水に凝集剤を注入して原水中の濁質をフロッ
クとして凝集沈澱させる浄水場の凝集剤注入制御方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling flocculant injection in a water purification plant, in which a flocculant is injected into raw water to coagulate and precipitate suspended matter in the raw water as flocs.
浄水場においては原中水の濁質を沈降処理するため凝集
剤を注入している。従来、凝集剤の注入率は濁度計やア
ルカリ度肝などの水質計器からの水質信号によって演算
式により求めるようにしている。また、複数系の処理系
において凝集剤の注入率を変化させ処理水濁度の良否に
より、最適な凝集剤注入率を求めることも特開昭５４−
７７４２５号で提案されている。At water treatment plants, flocculants are injected to settle the turbidity of raw water. Conventionally, the injection rate of the flocculant has been determined by an arithmetic formula based on water quality signals from water quality meters such as turbidity meters and alkalinity meters. In addition, it is also possible to determine the optimum coagulant injection rate by varying the coagulant injection rate in multiple treatment systems and depending on the quality of the treated water turbidity.
It is proposed in No. 77425.
従来技術は実際の凝集効果の判断を沈澱池において沈澱
処理した後の処理水によって行っている。In the prior art, the actual flocculation effect is determined based on treated water that has been subjected to sedimentation treatment in a sedimentation tank.
しかし、沈澱池の滞留時間が大きいため時間遅れを伴い
現時点の原水に対して適切な量の凝集剤を注入できなく
なる。その結果、濁質の良好な凝集沈澱を行えなくなる
。凝集剤注入率が適切でないと濾過池の目詰まりや良く
清澄水が得られなくなる。However, since the residence time in the sedimentation tank is long, there is a time delay and it becomes impossible to inject an appropriate amount of flocculant to the current raw water. As a result, good coagulation and sedimentation of suspended matter cannot be performed. If the flocculant injection rate is not appropriate, the filter will become clogged and clear water will not be obtained.
本発明のｉ的は凝集効果を速やかに判断し良好な凝集効
果を得ることのできる浄水場の凝集剤注入制御方法を提
供することにある。An object of the present invention is to provide a method for controlling the injection of a flocculant in a water purification plant, which can quickly determine the flocculation effect and obtain a good flocculation effect.
本発明はフロック形成池に水中カメラを設置し。 The present invention installs an underwater camera in a floc formation pond.
水中カメラから得られるフロック画像信号を画像処理装
置に取込み、凝集剤注入率を変化させて効果待時間後の
フロック形式状態を判断して最適注入率を求めることに
より達成される。This is achieved by inputting a floc image signal obtained from an underwater camera into an image processing device, changing the flocculant injection rate, determining the floc form state after an effect waiting time, and determining the optimum injection rate.
フロック形成池において凝集状態を判断しているので時
間遅れなく適切な凝集剤注入率を求めることができる。Since the flocculation state is determined in the floc formation pond, an appropriate flocculant injection rate can be determined without time delay.
以下、本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
第１図において河川などから取水された原水１は着水井
２に導かれる、着水井２に注入する原水流量は流量計１
０で測定される。着水井２では塩素が注入され、殺菌や
鉄、マンガンの酸化が行われる。着水井２においてはア
ルカリ剤を注入し、ｐＨ調整とアルカリ調整を行い混和
池３に導かれる。混和池３では凝集剤注入機１１から凝
集剤を注入し急速撹拌する。凝集剤注入量は後述するよ
うにして制御される。混和池３で原水に含まれている濁
質は凝集し微細なフロックを形成する。フロック形成池
４では緩速撹拌が行われ微細なフロックを成長させマイ
クロフロックを形成する。フロック形成池４には水中カ
メラ１３が設置され、水中カメラ１３で撮影したフロッ
ク画像信号工は画像処理装置１４に与えられる。フロッ
ク形成池４から流出した原水は沈澱池５に流入し、マイ
クロフロックの沈澱除去が行われる。沈澱池５の処理水
６は濾過池（図示せず）に送られる。画像処理装置１４
はフロック画像信号工を入力しフロック形成状態を解析
する。画像処理装置１４はフロック形成状態を解析した
フロック状態信号Ｊを注入率設定回路１５に与える。注
入率設定回路１２は基準注入率Ｄｏを記憶する記憶回路
１６と、注入率の増加分αと減少分βをそれぞれ記憶す
る記憶回路１７Ａ、１７Ｂ、スイッチ１８Ａ、１８Ｂお
よび加算器１９とで構成される。注入率設定回路１２は
注入率設定信号Ｄ！を注入調節計１２に与える。注入調
節計１２は注入率設定信号Ｄ１と流量計１０から得られ
る流量信号Ｆにより凝集剤注入量Ｍを求め凝集剤注入機
１１を制御する。In Figure 1, raw water 1 taken from a river etc. is guided to a receiving well 2, and the flow rate of raw water injected into the receiving well 2 is measured by a flowmeter 1.
Measured at 0. Chlorine is injected into the landing well 2 to sterilize and oxidize iron and manganese. In the receiving well 2, an alkaline agent is injected, pH adjustment and alkali adjustment are performed, and the water is led to the mixing pond 3. In the mixing pond 3, a flocculant is injected from a flocculant injector 11 and rapidly stirred. The amount of coagulant injected is controlled as described below. In the mixing pond 3, suspended solids contained in the raw water coagulate to form fine flocs. In the floc formation pond 4, slow stirring is performed to grow fine flocs and form micro flocs. An underwater camera 13 is installed in the floc formation pond 4, and a floc image signal photographed by the underwater camera 13 is provided to an image processing device 14. The raw water flowing out from the floc formation basin 4 flows into the settling basin 5, where micro flocs are removed by sedimentation. Treated water 6 from the sedimentation tank 5 is sent to a filtration tank (not shown). Image processing device 14
inputs the floc image signal and analyzes the floc formation state. The image processing device 14 provides the injection rate setting circuit 15 with a floc state signal J obtained by analyzing the floc formation state. The injection rate setting circuit 12 includes a memory circuit 16 that stores a reference injection rate Do, memory circuits 17A and 17B that respectively store an increase α and a decrease β in the injection rate, switches 18A and 18B, and an adder 19. Ru. The injection rate setting circuit 12 receives the injection rate setting signal D! is applied to the injection controller 12. The injection controller 12 determines the flocculant injection amount M based on the injection rate setting signal D1 and the flow rate signal F obtained from the flow meter 10, and controls the flocculant injector 11.
次に動作を第２図〜第４図を参照して説明する。Next, the operation will be explained with reference to FIGS. 2 to 4.
今、第２図に示すように注入率設定信号Ｄ１が記憶回路
１６の設定する基準注入率Ｄｏと等しい値で凝集剤を注
入しているとする。この状態にあるとき画像処理袋］ｎ
１４は水中カメラ１３からのフロック画像信号１を入力
しフロック形成状態を評価する。Now, assume that the flocculant is injected at a value where the injection rate setting signal D1 is equal to the reference injection rate Do set by the storage circuit 16, as shown in FIG. Image processing bag in this state]n
14 inputs the flock image signal 1 from the underwater camera 13 and evaluates the state of flock formation.
画像処理装置１１は次のようにしてフロック形成状態を
評価する。フロック画像信号工により第７３図（ａ）に
示すように粒径と体積濃度分布を求める。また、第３図
（ｂ）に示すようにフロック粒径とフロックの沈澱池５
における沈降速度を求める。なお、第３図において破線
より左側の粒径は沈降しない粒径を示している。第３図
に示す濃度分布と沈降速度の関係より凝集水濁度を予測
し、この予測に基づき凝集剤注入による凝集効果を判断
する。The image processing device 11 evaluates the floc formation state as follows. Particle size and volume concentration distribution are determined by flock image signal processing as shown in FIG. 73(a). In addition, as shown in Figure 3(b), the floc particle size and floc sedimentation tank 5
Find the sedimentation rate at In addition, in FIG. 3, the particle size on the left side of the broken line indicates the particle size that does not settle. The flocculating water turbidity is predicted from the relationship between the concentration distribution and sedimentation rate shown in FIG. 3, and the flocculating effect of flocculant injection is determined based on this prediction.
一方、凝集剤注入率と沈澱池出口の沈澱水濁度には第４
図に示すような関係がある。第４図に示すように凝集剤
注入率には凝集効果を最適とする注入点、つ永り沈澱水
濁度を最小とする注入率Ｄｐが存在する。画像処理装置
１４はこのような観点からフロック形成状態を判断しフ
ロック状態信号Ｊを出力する。画像処理装置１４は記憶
回路１７Ａ、１７Ｂに記憶されている増加分子αあるい
は減少分−βで注入率を変更した際に変更した注入率に
よる凝集効果が良ければフロック状態信号ＪをＩＩ Ｉ
Ｉ＋レベルとし、変更前より悪ければｒＬ ＯＩ＋レ
ベルにする。On the other hand, the coagulant injection rate and the sedimentation water turbidity at the sedimentation tank outlet have a
There is a relationship as shown in the figure. As shown in FIG. 4, there is an injection point at which the flocculant injection rate optimizes the flocculation effect and an injection rate Dp at which the turbidity of the precipitated water is minimized. The image processing device 14 determines the floc formation state from this viewpoint and outputs the floc state signal J. The image processing device 14 changes the floc state signal J if the aggregation effect due to the changed injection rate is good when the injection rate is changed by the increase molecule α or the decrease -β stored in the memory circuits 17A and 17B.
It is set to I+ level, and if it is worse than before the change, it is set to rLOI+ level.
さて、凝集剤注入率Ｄ１で注入しているときに時間ｔ１
においてスイッチ１８Ａをオンして注入率増加分βを基
準注入率Ｄｏに加算し注入率設定４８号Ｄ＋をＤｏ＋ａ
とする。スイッチ１８Ａは′Ｉ５！ＩＳ剤注入による効
果がフロック形成池４に現われる効果待時間Ｔｏだけオ
ンしている。注入率設定信号Ｄ１をＯｏ＋αにしてから
効果待時間Ｔｏ後の時間ｔ２に画像処理装置１４がフロ
ック状態信号Ｊを１１１”レベルにした場合には記憶回
路１６の基準注入率をＤｏ十αに変更する。Now, when the flocculant is injected at the injection rate D1, the time t1
, turn on the switch 18A, add the injection rate increase β to the standard injection rate Do, and set the injection rate setting No. 48 D+ to Do+a.
shall be. Switch 18A is 'I5! It remains on for an effect waiting time To during which the effect of the IS agent injection appears in the flocculation pond 4. When the image processing device 14 sets the flock state signal J to the 111'' level at time t2 after the effect waiting time To after setting the injection rate setting signal D1 to Oo+α, the reference injection rate in the storage circuit 16 is changed to Do+α. do.
一方、時間ｔ２において画像処理装置１４の信号Ｊが゛
′０″レベルのときには記憶回路１６の基準注入率を変
更せずにＤｏのままとする。時間ｔ２以後は注入率設定
信号Ｄ１をＤｏとし、次に時間ｔ３においてスイッチ１
８Ｂをオンする。スイッチ１８Ｂも効果待時間Ｔｏだけ
オンにする。注入率設定回路１５は注入率設定信号Ｄ１
をＤＯ−βとする６画像処理袋［１４は上述のようにし
て凝集状態の判断を行い、ＤＩ＝ＤＯに対してＤ ｓ
”＝ Ｄ 。On the other hand, when the signal J of the image processing device 14 is at the "0" level at time t2, the reference injection rate in the storage circuit 16 is not changed and remains at Do. After time t2, the injection rate setting signal D1 is set to Do. , then at time t3 switch 1
Turn on 8B. The switch 18B is also turned on for the effect waiting time To. The injection rate setting circuit 15 receives the injection rate setting signal D1.
6 image processing bags [14 is the above-mentioned method to judge the agglomeration state, and D s for DI=DO
”=D.
−βのときが良いときには時間１＋においてフロック状
態信号Ｊを″１″ルベルにする。これにより記憶回路１
６の基準注入率はＤｏ−βになる。When -β is good, the flock state signal J is set to "1" level at time 1+. As a result, memory circuit 1
The reference injection rate of 6 becomes Do-β.
Ｄ １ ＝ Ｄ ｏに対しＤ＋＝Ｄｏ−βが悪いときに
はＤ１＝Ｄｏ にする。When D1=Do and D+=Do−β is bad, set D1=Do.
以上のような凝集剤注入率の増加、減少の処理を周期的
に行うことによって最適の注入率を求めることができる
。The optimum injection rate can be determined by periodically performing the process of increasing and decreasing the flocculant injection rate as described above.
最適注入率に対し現状注入率が高い時に現状注入率を増
加させるとフロック形成状態は悪くなり沈澱水濁度は高
くなる。逆に、注入率を減少させるとフロック形成状態
は良くなり沈澱水濁度は低くなる。又、最適注入率に対
し現状注入率が低い時に現状注入率を増加させるとフロ
ック形成状態は良くなり沈澱水濁度は低くなる。逆に注
入率を減少させるとフロック形成状態は悪くなり沈澱水
濁度は高（なる。いずれの場合に於いてもフロック形成
状態が良くなった方向へ現状注入率を増加あるいは減少
させて行くと最適注入率近傍においては、注入率を増加
又は減少させてもフロック形成状態は悪くなるので最適
注入率を決定できる。When the current injection rate is higher than the optimum injection rate, if the current injection rate is increased, the floc formation condition will deteriorate and the turbidity of the precipitated water will increase. Conversely, when the injection rate is decreased, the floc formation condition improves and the turbidity of the precipitated water decreases. Furthermore, when the current injection rate is lower than the optimum injection rate, increasing the current injection rate improves the floc formation state and lowers the turbidity of the precipitated water. Conversely, if the injection rate is decreased, the condition of floc formation deteriorates and the turbidity of the precipitated water becomes high.In either case, if the current injection rate is increased or decreased in a direction that improves the condition of floc formation, In the vicinity of the optimum injection rate, the condition of floc formation worsens even if the injection rate is increased or decreased, so the optimum injection rate can be determined.
この様に凝集剤注入率を変化させ効果待時間後のフロッ
ク形成池でのフロック形成状態により、最適な注入率を
決定することによって、実際の凝集効果を考慮し、遅れ
時間の短いａ集済注入制御ができる。In this way, by changing the flocculant injection rate and determining the optimum injection rate based on the floc formation state in the floc formation pond after the effect waiting time, the actual flocculation effect can be taken into consideration, and a Injection control is possible.
以上説明したように本発明によればフロック形成池にお
いてフロック形成状態を判断し最適注入率を求めている
ので遅れ時間の短い凝集剤注入制御が可能となり良好な
凝集剤注入を行える。As explained above, according to the present invention, since the floc formation state in the floc formation pond is judged and the optimum injection rate is determined, flocculant injection control with a short delay time is possible and good flocculant injection can be performed.
第１図は本発明の一実施例を示す構成図、第２図は動作
説明のタイムチャート、第３図、第４図は凝集状態判別
の説明図である。
３・・急速混和池、４・・・フロック形成池、５・・・
沈澱池、１１・・・凝集剤注入機、１２・・・注入調節
計。
１３・・水中カメラ、１４・・・画像処理装置、１５・
・・注入率設定回路、１６・・・基準注入率記憶回路、
１７Ａ・・・注入率増加分記憶回路、１７Ｂ・・・注入
率減少分記憶回路。FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation, and FIGS. 3 and 4 are diagrams for explaining the aggregation state determination. 3... Rapid mixing pond, 4... Floc formation pond, 5...
Sedimentation tank, 11... flocculant injection machine, 12... injection controller. 13... Underwater camera, 14... Image processing device, 15...
... Injection rate setting circuit, 16... Reference injection rate storage circuit,
17A... Injection rate increase memory circuit, 17B... Injection rate decrease memory circuit.
Claims (1)
いて原水中の濁質のフロックを形成するようにした浄水
場において、前記フロック形成池に水中カメラを設置し
、この水中カメラから得られるフロック画像信号を画像
処理装置に取込み画像処理によりフロックの形成状態を
判断し、凝集剤注入率を変化させて効果待時間後の前記
画像処理装置によるフロック形成状態判断に基づき最適
注入率を求めることを特徴とする浄水場の凝集剤注入制
御方法。1. In a water purification plant where a flocculant is injected into the raw water taken and the turbidity in the raw water is formed into flocs in a flocculation pond, an underwater camera is installed in the flocculation pond, and the flocs obtained from this underwater camera are The image signal is taken into an image processing device, the state of floc formation is determined by image processing, and the flocculant injection rate is varied to determine the optimum injection rate based on the floc formation state judgment by the image processing device after an effect waiting time. Features: A flocculant injection control method for water treatment plants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32375487A JPH01168308A (en) | 1987-12-23 | 1987-12-23 | Control of coagulant injection in water filtering plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32375487A JPH01168308A (en) | 1987-12-23 | 1987-12-23 | Control of coagulant injection in water filtering plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01168308A true JPH01168308A (en) | 1989-07-03 |
Family
ID=18158250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32375487A Pending JPH01168308A (en) | 1987-12-23 | 1987-12-23 | Control of coagulant injection in water filtering plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01168308A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020134449A (en) * | 2019-02-25 | 2020-08-31 | 国立大学法人 筑波大学 | Sedimentation speed measurement method |
| WO2023199599A1 (en) * | 2022-04-11 | 2023-10-19 | 株式会社 東芝 | Sludge state display and notification system, and sludge state display and notification method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111109A (en) * | 1984-11-02 | 1986-05-29 | Hitachi Ltd | Flocculation controller |
| JPS62214331A (en) * | 1986-03-17 | 1987-09-21 | Hitachi Ltd | Control device for injection of flocculating agent to water treatment plant |
| JPS62241512A (en) * | 1986-04-10 | 1987-10-22 | Hitachi Ltd | Device for controlling injection of flocculant |
| JPS62250919A (en) * | 1986-04-25 | 1987-10-31 | Meidensha Electric Mfg Co Ltd | Floc formation monitor |
| JPS62266107A (en) * | 1986-05-14 | 1987-11-18 | Hitachi Ltd | Device for controlling injection of flocculating agent in water purifying plant |
-
1987
- 1987-12-23 JP JP32375487A patent/JPH01168308A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61111109A (en) * | 1984-11-02 | 1986-05-29 | Hitachi Ltd | Flocculation controller |
| JPS62214331A (en) * | 1986-03-17 | 1987-09-21 | Hitachi Ltd | Control device for injection of flocculating agent to water treatment plant |
| JPS62241512A (en) * | 1986-04-10 | 1987-10-22 | Hitachi Ltd | Device for controlling injection of flocculant |
| JPS62250919A (en) * | 1986-04-25 | 1987-10-31 | Meidensha Electric Mfg Co Ltd | Floc formation monitor |
| JPS62266107A (en) * | 1986-05-14 | 1987-11-18 | Hitachi Ltd | Device for controlling injection of flocculating agent in water purifying plant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020134449A (en) * | 2019-02-25 | 2020-08-31 | 国立大学法人 筑波大学 | Sedimentation speed measurement method |
| WO2023199599A1 (en) * | 2022-04-11 | 2023-10-19 | 株式会社 東芝 | Sludge state display and notification system, and sludge state display and notification method |
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