JPH026566B2 - - Google Patents
Info
- Publication number
- JPH026566B2 JPH026566B2 JP57040713A JP4071382A JPH026566B2 JP H026566 B2 JPH026566 B2 JP H026566B2 JP 57040713 A JP57040713 A JP 57040713A JP 4071382 A JP4071382 A JP 4071382A JP H026566 B2 JPH026566 B2 JP H026566B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- water level
- filter
- control device
- level change
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 92
- 238000000034 method Methods 0.000 claims description 13
- 238000011001 backwashing Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000010865 sewage Substances 0.000 claims description 5
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Filtration Of Liquid (AREA)
Description
【発明の詳細な説明】
(a) 技術分野の説明
本発明は下水処理場のろ過機設備に係り、ろ機
の改良された制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to filter equipment for a sewage treatment plant, and relates to an improved control device for the filter.
(b) 従来技術の説明
第１図は従来の下水処理場におけるろ過設備、
制御の一例を示し、ろ過機１ａ，１ｂは二字処理
され、二次処理水槽２に貯えられた水を三次処理
水槽３へ供給するため、原水ポンプ４ａ，４ｂを
運転し、三次処理水（以下処理水と称す）を製造
する。一般に、下水処理場の三次処理設備は、処
理場内で必要とする水を上水の代りとして製造す
ることを目的とするため、浄水場のろ過設備程、
大規模のものでなく、又、台数もさほど多く設け
られない場合が多い。本例ではろ過機２台の場合
を示している。(b) Description of conventional technology Figure 1 shows filtration equipment in a conventional sewage treatment plant.
An example of control is shown in which the filters 1a and 1b operate the raw water pumps 4a and 4b to supply the water that has been subjected to two-character treatment and stored in the secondary treatment tank 2 to the tertiary treatment tank 3, and the tertiary treated water ( (hereinafter referred to as treated water). Generally, the purpose of tertiary treatment equipment at a sewage treatment plant is to produce the water needed within the treatment plant as a substitute for tap water, so the filtration equipment at a water treatment plant is
They are not large-scale and often do not have many units installed. This example shows the case of two filters.
ろ過機１ａ，１ｂの運転は、必要な処理水を製
造するために、例えば三次処理槽３の水位を水位
計５より水位入力部６へ入力し、水位によりろ過
機１台の運転か、又は２台の運転かを決める。又
同様に１台の停止か、２台の停止かを台数制御部
７で制御している。台数制御部７からの起動、停
止指令により、原水ポンプ４ａ，４ｂを駆動する
モータ８ａ，８ｂへ指令が渡される。 In order to produce the necessary treated water, the filters 1a and 1b are operated by inputting the water level of the tertiary treatment tank 3 from the water level meter 5 to the water level input section 6, and depending on the water level, one filter can be operated, or Decide whether to drive two cars. Similarly, the number control unit 7 controls whether one or two machines are stopped. In response to start and stop commands from the number control unit 7, commands are passed to motors 8a and 8b that drive raw water pumps 4a and 4b.
原水ポンプ４ａ，４ｂの送水量は予め流量設定
部９ａ，９ｂで設定された送水量となるよう、流
量制御部１０ａ，１０ｂで電磁流量計１１ａ，１
１ｂで測られて計測信号とつき合わされ、操作出
力がモータ速度制御部１２ａ，１２ｂへ渡されて
いる。又、ろ過機は第２図に示すように、運転時
間とろ過機内の入口と出口の圧力差（以下、差圧
と称す）との間に、ろ過能力（ろ過速度）即わ
ち、原水ポンプの送水量をパラメータとして、時
間の経過につれ、差圧は徐々に大きくなり、原水
ポンプの送水量が大きい程、差圧の立ち上がりも
早いという性質を有している。 The electromagnetic flowmeters 11a and 1 are controlled by the flow rate controllers 10a and 10b so that the amount of water sent by the raw water pumps 4a and 4b is set in advance by the flow rate setting units 9a and 9b.
1b and compared with the measurement signal, the operation output is passed to motor speed control sections 12a and 12b. In addition, as shown in Figure 2, the filter has a filtration capacity (filtration rate), i.e., a raw water pump, which is affected by the operating time and the pressure difference between the inlet and outlet of the filter (hereinafter referred to as differential pressure). The differential pressure gradually increases with the passage of time using the amount of water fed as a parameter, and the higher the amount of water fed by the raw water pump, the faster the differential pressure rises.
ろ過能力としては、送水量大の場合であつて
も、小の場合であつても、一定差圧に到達する迄
にろ過来る能力にほとんど差はない。第３図にろ
過機の差圧（ΔP）、流量（Ｑ）特性を示す。ΔP
がある一定の値になると、ろ過流量がほとんど得
られなくなるため、差圧を差圧計１３ａ，１３ｂ
で計測し、その信号を差圧入力部１４ａ，１４ｂ
へ入力し、第２図に示す差圧が規定値ΔPhに到達
した時、逆洗工程制御装置１５でろ過機１ａ，１
ｂの該当するものの洗浄を行なうことにより、元
の差圧の低い状態に戻す。 There is almost no difference in filtration ability until a certain pressure difference is reached, whether the amount of water fed is large or small. Figure 3 shows the differential pressure (ΔP) and flow rate (Q) characteristics of the filter. ΔP
When it reaches a certain value, the filtration flow rate is hardly obtained, so the differential pressure is measured by differential pressure gauges 13a and 13b.
and send the signal to the differential pressure input parts 14a, 14b.
When the differential pressure shown in FIG. 2 reaches the specified value ΔPh, the backwashing process control device
By cleaning the items corresponding to (b), the original low differential pressure is restored.
しかしながら従来のこのような制御方法におい
ては、三次処理水槽の水位により、予じめ設定さ
れた送水量でろ過機が運転されるため、三次処理
水槽より処理水を利用する施設の利用具合によつ
ては、ろ過機のろ過能力が追いつかない場合があ
り、又、急激に処理水が利用されている場合でも
水位がろ過機駆動水位に到達しないとろ過機が運
転されない場合があり、更にこのような場合に、
逆洗工程に入つてしまうとろ過機は、一定時間、
処理水を供給できなくなるため、処理水を利用す
る施設に対して制約を与えるといつた問題があつ
た。 However, in this conventional control method, the filter is operated at a preset water flow rate depending on the water level of the tertiary treatment tank, so it depends on the usage of the facility that uses treated water from the tertiary treatment tank. In some cases, the filtration capacity of the filter may not be able to keep up, and even if treated water is being used rapidly, the filter may not operate unless the water level reaches the filter driving water level. In this case,
Once the backwashing process begins, the filter will run for a certain period of time.
There was a problem that since treated water could no longer be supplied, it would place restrictions on facilities that use treated water.
(c) 発明の目的
本考案はろ過機の制御において、三次処理水槽
の水位減少変化率に注目し、常に処理水が利用さ
れている場合には、利用される処理水と生産量が
見合うよう、三次処理水槽のレベルを規定水位以
上となるように制御すると同時に、逆洗工程に入
る時期もΔPhと限定せずΔPhに対し、ある一定の
値以内に入つた時に、先に述べた水位減少変化率
が０もしくはほとんど少ない時には、予じめ該当
するろ過機を１台逆洗工程に入らせ、処理水を必
要とする時にその要求に応えられるろ過機制御装
置を提供することを目的とする。(c) Purpose of the Invention The present invention focuses on the rate of decrease in the water level of the tertiary treatment water tank in controlling the filter, and when treated water is constantly used, it is possible to adjust the amount of production to match the used treated water. At the same time, the level of the tertiary treatment water tank is controlled to be above the specified water level, and at the same time, the timing for entering the backwashing process is not limited to ΔPh, but when it falls within a certain value with respect to ΔPh, the water level decreases as mentioned earlier. The purpose of the present invention is to provide a filter control device that allows one relevant filter to enter a backwashing process in advance when the rate of change is 0 or almost small, and can meet the demand for treated water when it is required. .
(d) 発明の構成と作用
以下、本発明を図面を参照して説明する。第４
図〜第６図は本発明の一実施例を示し、第４図は
制御装置の構成図、第５図及び第６図は本発明の
動作を示すフローチヤートである。すなわち、水
位計５から水位入力部６の読み込まれた水位信号
は、水位変化率判定部１６へ渡され、単位時間当
たりの水位変化率（dL／dtで以下表わす）が計算さ
れ、この値が負の値を示す時、即わち処理水の利
用が供給を上まわつている時には、三次処理水槽
３の底面積Ｓと水位変化量（dL）より、ろ過機１
台の送水量で処理可能か、又は２台の送水量が必
要かを台数制御部１７で演算する。そして求まつ
たろ過機の台数に対して起動指令を出し、先に述
べたｓ×dLの処理水を単位時間（dt）あたり供給
するための原水ポンプ送水量を、送水量設定値演
算部１８にて演算し、該当する原水ポンプの流量
制御部１０ａ，１０ｂに設定値を与える。第５図
にろ過機制御装置１９のフローを示す。(d) Structure and operation of the invention The present invention will be explained below with reference to the drawings. Fourth
6 to 6 show an embodiment of the present invention, FIG. 4 is a block diagram of a control device, and FIGS. 5 and 6 are flowcharts showing the operation of the present invention. That is, the water level signal read by the water level input section 6 from the water level meter 5 is passed to the water level change rate determination section 16, where the water level change rate per unit time (hereinafter expressed as d L /dt) is calculated, and this value is calculated. When shows a negative value, that is, when the use of treated water exceeds the supply, the filter 1
The number control unit 17 calculates whether the amount of water supplied by one unit can handle the water supply, or whether the amount of water supplied by two units is required. Then, a start command is issued to the number of filters determined, and the water supply amount setting value calculation unit calculates the raw water pump water flow rate to supply the aforementioned s x d L of treated water per unit time (dt). 18, and a set value is given to the flow rate controllers 10a and 10b of the corresponding raw water pump. FIG. 5 shows the flow of the filter control device 19.
原水ポンプの送水量設定値は、ろ過機が複数台
になる時は複数台で流量分配し、１台あたりの流
量設定値を計算している。dL／dtが０の時、即わち
処理水の利用と供給が等しい時は、現状を維持し
ておけばよい。又、dL／dtが正の時は、処理水の利
用に対し、供給が上まわるので、三次処理水槽３
の水位が規定水位Lhに到達する迄は供給を継続
し到達した時点でろ過機の停止を行なう。dL／dtの
判定には第５図では、負、０、正という表わし方
をしているが、各判定には不感帯を設けてあるこ
とはいうまでもない。 When there are multiple filters, the flow rate set value for the raw water pump is calculated by distributing the flow rate among the multiple filters and calculating the flow rate set value for each filter. When d L /dt is 0, that is, when the use and supply of treated water are equal, the current situation can be maintained. Also, when d L /dt is positive, the supply exceeds the use of treated water, so the tertiary treated water tank 3
Supply continues until the water level reaches the specified water level Lh, at which point the filter is stopped. Although the determination of d L /dt is expressed as negative, 0, and positive in FIG. 5, it goes without saying that a dead zone is provided for each determination.
ろ過機の目づまり防止のための逆洗工程につい
てはdL／dtを利用する。すなわち第６図に示すdL／dtが
ある値1以下の時、つまり三次処理水槽３の減
少、又は増加がほぼ問題なく、更に規定水位が確
保されている時には、差圧計１３ａ，１３ｂより
の差圧信号が逆洗に必要な差圧ΔPhに到達してい
なくても、ΔPh近傍のΔPh′（第２図に図示）にな
つていれば、逆洗工程を行なわせることにより、
処理水がより必要となる時期に備えておくことも
出来る。第４図におけるΔPh′設定部２０がΔPh
を設定するところであり、逆洗工程演算制御装置
２１にて第６図に示した制御を実行する。 For the backwashing process to prevent clogging of the filter, use dL /dt. In other words, when d L /dt shown in Fig. 6 is less than a certain value 1 , that is, when there is almost no problem in decreasing or increasing the tertiary treatment water tank 3 and the specified water level is secured, the pressure from the differential pressure gauges 13a and 13b is Even if the differential pressure signal has not reached the differential pressure ΔPh required for backwashing, if it reaches ΔPh′ (shown in Figure 2) near ΔPh, the backwashing process can be performed.
It is also possible to reserve treated water for times when it is needed more. The ΔPh' setting section 20 in FIG.
is set, and the control shown in FIG. 6 is executed by the backwash process arithmetic and control device 21.
(e) 総合的な効果
以上説明したように本発明によれば、有限な三
次処理水槽の水位変化率を計算し、水位変化率が
減少傾向にある時は、三次処理水槽の水位を目標
水位に回復するような、ろ過機原水ポンプに対す
る水量目標値を演算することにより、処理場必要
な処理水を常に必要量確保すると同時に、逆洗工
程に入る時期も、差圧ΔPhといつた条件のみでな
く、その時の処理水の利用状況を把握することに
より、差圧ΔPhに到達以前であつても、処理水の
利用状況が近い時には、予め逆洗工程を行なつて
しまうことにより、ろ過機の処理能力を保つこと
ができるといつた効果が得られる。(e) Overall effect As explained above, according to the present invention, the water level change rate of the finite tertiary treatment tank is calculated, and when the water level change rate is decreasing, the water level of the tertiary treatment tank is set to the target water level. By calculating the water volume target value for the filtration raw water pump that will restore the water to the original water pump, it is possible to always secure the necessary amount of treated water for the treatment plant, and at the same time, the time to enter the backwashing process can be controlled only under conditions such as differential pressure ΔPh. Instead, by understanding the usage status of the treated water at that time, even before the differential pressure ΔPh is reached, when the usage status of the treated water is close to being used, the filtration machine can be backwashed in advance by performing a backwashing process. Effects such as being able to maintain processing capacity can be obtained.
第１図は従来のろ過設備制御の一例を示すブロ
ツク図、第２図はろ過機の運転時間と差圧の関係
図、第３図はろ過機の差圧と流量特性の関係図、
第４図は本発明の一実施例を示すブロツク図、第
５図はろ過機制御装置を主体とするフローシー
ト、第６図は逆洗工程演算制御装置のフローシー
トを示す図である。
１ａ，１ｂ……ろ過機、２……二次処理水槽、
３……三次処理水槽、４ａ，４ｂ……原水ポン
プ、５……水位計、６……水位入力部、７，１７
……台数制御部、８ａ，８ｂ……モータ、９ａ，
９ｂ……流量設定部、１０ａ，１０ｂ……流量制
御部、１１ａ，１１ｂ……電磁流量計、１２ａ，
１２ｂ……モータ速度制御部、１３ａ，１３ｂ…
…差圧計、１４ａ，１４ｂ……差圧入力部、１５
……逆洗工程制御装置、１６……水位変化率判定
部、１８……送水量設定値演算部、１９……ろ過
機制御装置、２０……ΔPh設定部、２１……逆洗
工程演算制御装置。
Figure 1 is a block diagram showing an example of conventional filtration equipment control, Figure 2 is a diagram of the relationship between filter operating time and differential pressure, Figure 3 is a diagram of the relationship between differential pressure of the filter and flow characteristics,
FIG. 4 is a block diagram showing an embodiment of the present invention, FIG. 5 is a flow sheet mainly based on a filter control device, and FIG. 6 is a flow sheet showing a backwash process calculation control device. 1a, 1b...Filter, 2...Secondary treatment water tank,
3...Tertiary treatment water tank, 4a, 4b...Raw water pump, 5...Water level gauge, 6...Water level input section, 7, 17
...Number of units control unit, 8a, 8b...Motor, 9a,
9b...Flow rate setting section, 10a, 10b...Flow rate control section, 11a, 11b...Electromagnetic flowmeter, 12a,
12b...Motor speed control section, 13a, 13b...
...Differential pressure gauge, 14a, 14b...Differential pressure input section, 15
... Backwash process control device, 16 ... Water level change rate determination section, 18 ... Water supply amount setting value calculation section, 19 ... Filter control device, 20 ... ΔPh setting section, 21 ... Backwash process calculation control Device.
Claims (1)
製造する三次処理設備を備えた下水処理場のろ過
機制御装置において、前記三次処理設備を構成す
る三次処理水槽の水位を入力し水位変化率を判定
する水位変化率判定部と、この判定結果に基づき
ろ過機の起動、停止を求める台数制御部と、ろ過
機における送水量を演算する送水量演算値設定部
とからなるろ過機制御装置。 ２ 処理場内で必要とする水を上水の代りとして
製造する三次処理設備を備えた下水処理場のろ過
機制御装置において、前記三次処理設備を構成す
る三次処理水槽の水位を入力し水位変化率を判定
する水位変化率判定部と、この判定結果に基づき
ろ過機の起動、停止を求める台数制御部と、ろ過
機における送水量を演算する送水量演算値設定部
と、前記水位変化率判定部、及びろ過機に設けた
入口と出口の差圧を検出する差圧計の出力を読み
込み逆洗工程を求める逆洗工程演算制御装置とか
らなるろ過機制御装置。[Scope of Claims] 1. In a filter control device for a sewage treatment plant equipped with tertiary treatment equipment that produces water needed within the treatment plant in place of tap water, the water level of a tertiary treatment water tank constituting the tertiary treatment equipment a water level change rate determination unit that determines the rate of water level change by inputting the water level, a number control unit that determines whether or not to start or stop the filters based on this determination result, and a water flow rate calculation value setting unit that calculates the water flow rate in the filters. A filter control device. 2. In a filter control device of a sewage treatment plant equipped with tertiary treatment equipment that produces the water required within the treatment plant as a substitute for tap water, the water level of the tertiary treatment tank that constitutes the tertiary treatment equipment is input and the water level change rate is calculated. a water level change rate determination unit that determines the water level change rate; a number control unit that determines whether or not to start or stop the filters based on the determination result; a water supply amount calculation value setting unit that calculates the water supply amount in the filter; and the water level change rate determination unit. , and a backwashing process calculation and control device that reads the output of a differential pressure gauge that detects the differential pressure between the inlet and outlet of the filter and determines the backwashing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57040713A JPS58159822A (en) | 1982-03-17 | 1982-03-17 | Controlling device of filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57040713A JPS58159822A (en) | 1982-03-17 | 1982-03-17 | Controlling device of filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58159822A JPS58159822A (en) | 1983-09-22 |
| JPH026566B2 true JPH026566B2 (en) | 1990-02-09 |
Family
ID=12588218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57040713A Granted JPS58159822A (en) | 1982-03-17 | 1982-03-17 | Controlling device of filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58159822A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63270514A (en) * | 1987-04-30 | 1988-11-08 | Toshiba Corp | Controller for filter basin of purification plant |
-
1982
- 1982-03-17 JP JP57040713A patent/JPS58159822A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58159822A (en) | 1983-09-22 |
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