JPH05154489A - Backwash controller for biological activated carbon treatment tank - Google Patents
Backwash controller for biological activated carbon treatment tankInfo
- Publication number
- JPH05154489A JPH05154489A JP3321584A JP32158491A JPH05154489A JP H05154489 A JPH05154489 A JP H05154489A JP 3321584 A JP3321584 A JP 3321584A JP 32158491 A JP32158491 A JP 32158491A JP H05154489 A JPH05154489 A JP H05154489A
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- biological activated
- treatment tank
- micro
- carbon treatment
- 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
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
- Biological Treatment Of Waste Water (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高度浄水処理設備に
用いられる生物活性炭（ＢＡＣ）処理槽の逆洗制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwash control device for a biological activated carbon (BAC) treatment tank used in a highly purified water treatment facility.
【０００２】[0002]
【従来の技術】近年、安全でおいしい水を作る目的で生
物活性炭処理が注目されている。この生物活性炭処理
は、粒状活性炭に微生物を生育させ、この粒状活性炭に
生育させた微生物の代謝作用と粒状活性炭本来の物理化
学的吸着作用とを利用して、原水中の汚染有機物質や異
臭味などを除去するものである。2. Description of the Related Art In recent years, biological activated carbon treatment has attracted attention for the purpose of producing safe and delicious water. This biological activated carbon treatment grows microorganisms on the granular activated carbon and utilizes the metabolic action of the microorganisms grown on the granular activated carbon and the physicochemical adsorption action of the granular activated carbon to contaminate the polluted organic substances and off-flavors in the raw water. Etc. are removed.
【０００３】図４は、一般的な高度浄水処理設備におけ
る代表的な水処理プロセスのフローを示しているが、こ
のような水処理プロセスのフローにおいては、トリハロ
メタンなどの有害物質を生成する前塩素処理工程が存在
せず、まず最初に凝集沈澱処理工程１を実行した後、急
速濾過処理工程２、オゾン処理工程３、生物活性炭処理
工程４および後処理工程５の順で各校邸を実行するよう
にしている。FIG. 4 shows a flow of a typical water treatment process in a general advanced water purification treatment facility. In the flow of such a water treatment process, pre-chlorine for producing harmful substances such as trihalomethane is generated. After the coagulation-sedimentation treatment step 1 is first performed without any treatment step, each school residence is executed in the order of rapid filtration treatment step 2, ozone treatment step 3, biological activated carbon treatment step 4 and post-treatment step 5. I am trying.
【０００４】砂濾過処理で代表される急速濾過処理工程
２は、水中に懸濁する浮遊物を除去するものであるが、
これは、原水の特性に応じてオゾン処理工程３の後、あ
るいは生物活性炭処理工程４の後に行なわれることもあ
る。The rapid filtration treatment step 2 typified by sand filtration treatment removes suspended matter suspended in water.
This may be performed after the ozone treatment step 3 or after the biological activated carbon treatment step 4 depending on the characteristics of the raw water.
【０００５】オゾン処理工程３は、原水の異臭味除去、
生物活性炭の微生物代謝に有効な有機物の酸化、鉄・マ
ンガンの酸化、色度除去などを目的とするものである
が、このオゾン処理工程３は、上記の急速濾過処理工程
２の前に行なわれることもあり、また、急速濾過処理工
程２の前および生物活性炭処理工程４の前の両方で行な
われることもある。The ozone treatment step 3 is to remove the offensive odor of raw water,
The purpose is to oxidize organic substances effective for microbial metabolism of bioactive carbon, to oxidize iron and manganese, to remove chromaticity, etc., but this ozone treatment step 3 is performed before the rapid filtration treatment step 2 described above. In some cases, it may be performed both before the rapid filtration treatment step 2 and before the biological activated carbon treatment step 4.
【０００６】後処理工程５は、現行の後塩素処理工程と
同様、消毒の目的の他に、低温時などにおいて生物活性
炭から流出するアンモニア性窒素除去などを行なうこと
も目的としている。The post-treatment step 5, like the existing post-chlorination step, is intended to remove ammoniacal nitrogen flowing out from the biological activated carbon at low temperatures and the like, in addition to the purpose of disinfection.
【０００７】このように、生物活性炭処理工程４の前後
の各処理プロセスユニットの配列が原水の特性に応じて
異なることはあっても、生物活性炭処理工程４の基本特
性はなんら変わることはない。As described above, the basic characteristics of the biological activated carbon treatment step 4 do not change at all, even though the arrangement of the treatment process units before and after the biological activated carbon treatment step 4 may differ depending on the characteristics of the raw water.
【０００８】ところで、上述した生物活性炭処理工程４
では、通常の運転において、生物活性炭処理槽内に浮遊
懸濁物による圧損が生じるために、この生物活性炭処理
槽に対して空気と水とを利用した逆洗を定期的に実施す
る必要がある。この逆洗作業は、プラントの特性に応じ
て異なるが、通常、週に１回から３日に１回程度の頻度
で１０〜３０分間程度の時間の実施が必要とされる。By the way, the above-mentioned biological activated carbon treatment step 4
Therefore, in normal operation, pressure loss due to suspended suspension occurs in the biological activated carbon treatment tank, so it is necessary to periodically perform backwashing using this air on the biological activated carbon treatment tank. .. Although this backwashing operation varies depending on the characteristics of the plant, it is usually required to be performed once a week to once every three days for a time of about 10 to 30 minutes.
【０００９】しかしながら、この逆洗頻度、すなわち逆
洗周期は、プラントによって固定されているため、原水
の水質や季節、その他の諸要素に起因して、逆洗周期内
に生物活性炭処理槽において微小動物が大幅に増殖し、
この増殖した微小動物が生物活性炭処理槽内から流出す
ることがある。また、生物活性炭処理槽において微小動
物が増殖しないように逆洗周期を短くすると、粒状活性
炭に生育させた微生物に悪影響を与えるばかりか、逆洗
作業の実施時間中は浄水処理が中断されることになるの
で、逆洗作業の実施時間当たりの浄水供給量以上の浄水
を後処理工程５にて貯溜しておき、浄水供給の中断を防
止する必要がある。However, since this backwashing frequency, that is, the backwashing cycle is fixed by the plant, due to the water quality of the raw water, the season, and various other factors, the backwashing cycle has a small amount in the biological activated carbon treatment tank. The animals multiply a lot,
This propagated micro animal may flow out from the biological activated carbon treatment tank. Also, shortening the backwashing cycle to prevent the growth of microanimals in the biological activated carbon treatment tank not only adversely affects the microorganisms grown on the granular activated carbon, but also interrupts the water purification treatment during the backwashing operation time. Therefore, it is necessary to store the purified water in an amount equal to or more than the purified water supply amount per the backwashing work time in the post-treatment step 5 to prevent interruption of the purified water supply.
【００１０】[0010]
【発明が解決しようとする課題】以上のように、従来一
般に用いられてきた生物活性炭処理槽では、その逆洗周
期内に増殖した微小動物が大量に生物活性炭処理水中に
流出することがある。このようにして処理水中に流出す
る微小動物に対しては後処理工程５において殺菌、消毒
が行なわれるために衛生上の問題はないのであるが、微
小動物の大きさは０．１mmから２mm程度に達するため、
死滅しても人の目には感じられ、飲用する際に不快感を
与えてしまうことになるので、浄水中に混入することは
好ましいことではない。As described above, in the biologically activated carbon treatment tank that has been generally used in the past, a large amount of microanimals proliferated within the backwash cycle may flow out into the biologically activated carbon treated water. In this way, there is no hygiene problem because the micro-animals that flow into the treated water are sterilized and disinfected in the post-treatment step 5, but the size of the micro-animals is about 0.1 mm to 2 mm. To reach
It is not preferable to mix it in purified water, because even if it is killed, it will be felt by the human eye and will give discomfort when drinking.
【００１１】この発明の発明者らは、処理水の異なるプ
ラントにおいて、あるいは同一プラントでも処理水量や
処理水質の変化によって生物活性炭処理槽に増殖する微
小動物の数や生物活性炭処理槽から流出する微小動物の
数が大幅に変化する事実を確認している。また、これら
のプラントにおいて、生物活性炭処理槽の逆洗周期を短
縮することによって処理水中に流出する微小動物の数を
抑制することができることも確認している。The inventors of the present invention have found that the number of micro-animals that grow in the biological activated carbon treatment tank and the amount of micro-organisms flowing out from the biological activated carbon treatment tank in different plants of treated water or even in the same plant vary depending on the amount of treated water and the quality of treated water. We confirm the fact that the number of animals changes drastically. It has also been confirmed that in these plants, the number of micro-animals flowing out into the treated water can be suppressed by shortening the backwash cycle of the biological activated carbon treatment tank.
【００１２】したがって、この事実から、生物活性炭処
理槽から流出する処理水の単位水量当たりに存在する微
小動物の数を把握し、これに基づいて生物活性炭処理槽
の逆洗周期判定の効率的運用方法を確立することが重要
な課題となる。Therefore, from this fact, the number of micro animals existing per unit amount of treated water flowing out from the biological activated carbon treatment tank is grasped, and based on this, efficient operation of the backwash cycle determination of the biological activated carbon treatment tank is carried out. Establishing a method is an important issue.
【００１３】この発明は、このような技術的課題に鑑み
なされたもので、高度浄水処理を行なう生物活性炭処理
工程において、生物活性炭処理槽の逆洗周期を効率的に
判断することができ、安全でおいしい水づくりができ、
飲用時の視覚上も不快感を与えることがない浄水処理が
できる生物活性炭処理槽の逆洗制御装置を提供すること
を目的とする。The present invention has been made in view of the above technical problems, and in the biological activated carbon treatment step for performing advanced water purification treatment, the backwash cycle of the biological activated carbon treatment tank can be efficiently judged, and it is safe. You can make delicious water with
An object of the present invention is to provide a backwashing control device for a biological activated carbon treatment tank, which can perform water purification treatment without causing visual discomfort during drinking.
【００１４】[0014]
【課題を解決するための手段】この発明の生物活性炭処
理槽の逆洗制御装置は、生物活性炭が充填された生物活
性炭処理槽と、前記生物活性炭処理槽から流出する処理
水中の単位水量当たりに存在する微小動物の数を計測す
る微小動物計測手段と、前記微小動物計測手段の計測信
号に基づき、前記生物活性炭処理槽の逆洗時期を制御す
る演算制御手段とを備えたものである。A backwash controller for a biological activated carbon treatment tank according to the present invention provides a biological activated carbon treatment tank filled with biological activated carbon and a unit amount of treated water flowing out from the biological activated carbon treatment tank. It is provided with a micro-animal measuring means for measuring the number of existing micro-animals and an arithmetic control means for controlling the backwashing time of the biological activated carbon treatment tank based on the measurement signal of the micro-animal measuring means.
【００１５】また、この発明の生物活性炭処理槽の逆洗
制御装置は、上記の微小動物計測手段を、生物活性炭処
理槽から流出する処理水を分岐する分岐手段と、この分
岐手段によって分流された処理水の流量を測定する流量
計測手段と、前記分岐手段によって分流された処理水中
に存在する微小動物を捕獲する微小動物捕獲手段と、こ
の微小動物捕獲手段が捕獲した微小動物の数を計測する
微小動物数計測手段と、前記流量計測手段の計測出力と
前記微小動物数計測手段の計測出力に基づいて前記生物
活性炭処理槽から流出する処理水中にその単位水量当た
りに存在する微小動物数を演算する微小動物数演算手段
とから構成したものとすることができる。Further, in the backwashing control device for the biological activated carbon treatment tank of the present invention, the above-mentioned micro animal measuring means is branched by the branching means for branching the treated water flowing out from the biological activated carbon treatment tank and the branching means. Flow rate measuring means for measuring the flow rate of the treated water, micro animal capturing means for capturing the micro animals existing in the treated water divided by the branching means, and measuring the number of micro animals captured by the micro animal capturing means Micro animal number measuring means, and calculates the number of micro animals existing per unit amount of water in the treated water flowing out of the biological activated carbon treatment tank based on the measurement outputs of the flow rate measuring means and the micro animal number measuring means. And a means for calculating the number of small animals.
【００１６】[0016]
【作用】この発明の生物活性炭処理槽の逆洗制御装置で
は、微小動物計測手段によって生物活性炭処理槽から流
出する処理水中の単位水量当たりに存在する微小動物の
数を計測し、演算制御手段により、微小動物数の計測信
号に基づいて生物活性炭処理槽の逆洗時期を制御する。In the backwash control device for a biological activated carbon treatment tank of the present invention, the number of microanimals present per unit amount of treated water flowing out from the biological activated carbon treatment tank is measured by the microanimal measuring means, and the arithmetic control means is used. , The backwash time of the biological activated carbon treatment tank is controlled based on the measurement signal of the number of micro animals.
【００１７】こうして、生物活性炭処理槽の逆洗頻度を
コントロールすることにより、生物活性炭処理槽から流
出する微小動物数を抑制する。By controlling the backwashing frequency of the biological activated carbon treatment tank in this manner, the number of micro animals flowing out from the biological activated carbon treatment tank is suppressed.
【００１８】[0018]
【実施例】以下、この発明の実施例を図に基づいて詳説
する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００１９】図１はこの発明の生物活性炭処理槽の逆洗
制御装置の一実施例の構成を示すブロック図である。FIG. 1 is a block diagram showing the construction of an embodiment of a backwash control apparatus for a biological activated carbon treatment tank according to the present invention.
【００２０】この実施例の装置は高度浄水処理設備にお
ける生物活性炭処理槽に適用されるものである。図１に
示すように高度浄水処理設備は、主として前処理プロセ
ス６、生物活性炭処理装置７、演算制御システム８、後
処理プロセス９を備えており、この実施例の生物活性炭
処理槽の逆洗制御装置は、この高度浄水処理設備のう
ち、生物活性炭処理装置７および演算制御システム８の
部分から構成される。The apparatus of this embodiment is applied to a biological activated carbon treatment tank in an advanced water purification treatment facility. As shown in FIG. 1, the advanced water purification treatment facility mainly includes a pretreatment process 6, a biological activated carbon treatment device 7, an arithmetic control system 8 and a post-treatment process 9. The backwash control of the biological activated carbon treatment tank of this embodiment is performed. The device is composed of the biological activated carbon treatment device 7 and the arithmetic and control system 8 in the advanced water purification treatment facility.
【００２１】前処理プロセス６は、従来例として図４に
説明した凝集沈澱処理１〜オゾン処理３の処理プロセス
で構成されている。The pretreatment process 6 is composed of the treatment processes of aggregation and precipitation treatment 1 to ozone treatment 3 described in FIG. 4 as a conventional example.
【００２２】生物活性炭処理装置７は、生物活性炭処理
槽１０、被処理水開閉弁１１、逆洗水開閉弁１２、逆洗
排水開閉弁１３、排水開閉弁１４、処理水開閉弁１５か
ら構成されている。そして、生物活性炭処理槽１０内に
は、支持体１６により支持された生物活性炭１７が充填
されている。The biological activated carbon treatment apparatus 7 comprises a biological activated carbon treatment tank 10, treated water opening / closing valve 11, backwash water opening / closing valve 12, backwash drainage opening / closing valve 13, drainage opening / closing valve 14, treated water opening / closing valve 15. ing. The biological activated carbon treatment tank 10 is filled with the biological activated carbon 17 supported by the support 16.
【００２３】演算制御システム８は、流量調節弁１８、
これらの流量調節弁１８を制御する処理水分岐手段１
９、この処理水分岐手段１９の直後に設置され、各々分
岐水流の流量を計測する流量計測手段２０、微小動物捕
獲手段２１、微小動物計測手段２２、演算制御手段２
３、開閉弁２４から構成されている。The arithmetic control system 8 includes a flow control valve 18,
Treated water branching means 1 for controlling these flow rate control valves 18
9. A flow rate measuring unit 20, which is installed immediately after the treated water branching unit 19 and measures the flow rate of each branched water flow, a micro animal capturing unit 21, a micro animal measuring unit 22, and an arithmetic control unit 2.
3, the on-off valve 24.
【００２４】微小動物捕獲手段２１は、処理水中の微小
動物を捕獲するために、プランクトンネット、メッシュ
状フィルタ、あるいは浄水用膜によって構成されてい
る。The micro-animal capturing means 21 is composed of a plankton net, a mesh filter, or a water purification membrane for capturing micro-animals in the treated water.
【００２５】微小動物計測手段２２は、微小動物捕獲手
段２１によって捕獲された微小動物の数を計測するため
に、微小動物捕獲手段２１が捕獲した微小動物を湿状態
のままあるいは乾燥させた状態で重量を測定し、実験的
に求められる換算係数を掛けて算出する構成、メスシリ
ンダなどの測定器具を用いて体積を測定し、換算係数を
掛けて算出する構成、あるいは画像処理により一定体積
中に存在する微小動物数を直接計数する構成のものが用
いられる。The micro-animal measuring means 22 measures the number of micro-animals captured by the micro-animal capturing means 21 while keeping the micro-animals captured by the micro-animal capturing means 21 in a wet state or in a dried state. A configuration that measures the weight and calculates by multiplying it by an experimentally obtained conversion factor, a configuration that measures the volume by using a measuring instrument such as a graduated cylinder, and calculates by multiplying by the conversion factor, or in a certain volume by image processing A structure that directly counts the number of existing micro animals is used.
【００２６】演算制御手段２３は、各流量計測手段２０
による計測値Ｆ１，Ｆ２と微小動物計測手段２２による
計測値ＡＮとを読み込んで、後述する演算処理により単
位水量当たりに存在する微小動物数を求め、これを基準
値と比較することにより逆洗時期を判断し、逆洗指令を
生物活性炭処理装置７へ出力するものであるが、分岐手
段１９に対する分配比の制御も行なう。The arithmetic control means 23 is provided for each flow rate measuring means 20.
The measurement values F1 and F2 by the micro-animal measuring means 22 and the measurement value AN by the micro-animal measuring means 22 are read, the number of micro-animals existing per unit amount of water is calculated by the arithmetic processing described later, and the back-washing time is calculated by comparing this with a reference value. Is determined and the backwash command is output to the biological activated carbon treatment device 7, but the distribution ratio to the branching means 19 is also controlled.
【００２７】次に、上記の構成の生物活性炭処理槽の逆
洗制御装置の動作について説明する。Next, the operation of the backwash control device for the biological activated carbon treatment tank having the above structure will be described.
【００２８】前処理プロセス６から生物活性炭処理装置
７の生物活性炭処理槽１０に送り込まれてくる水は、こ
こで生物活性炭との接触によって生物活性炭処理され、
処理水開閉弁１５を経て演算制御システム８に送り出さ
れる。The water sent from the pretreatment process 6 to the biological activated carbon treatment tank 10 of the biological activated carbon treatment device 7 is treated with the biological activated carbon by contact with the biological activated carbon,
It is sent to the arithmetic and control system 8 via the treated water on-off valve 15.
【００２９】演算制御システム８では、処理水分岐手段
１９により流量調節弁１８の開度を調節することによ
り、送り込まれてくる処理水を直接後処理プロセス９に
導かれる系統と微小動物捕獲手段２１を経由して後処理
プロセス９に導かれる系統に分配する。In the arithmetic control system 8, the opening of the flow control valve 18 is adjusted by the treated water branching means 19 so that the introduced treated water is directly guided to the post-treatment process 9 and the small animal catching means 21. To the system which is led to the post-treatment process 9 via.
【００３０】これらの分配された処理水それぞれは、処
理水分岐手段１９の直後に設けられている流量計測手段
２０により流量計測がなされ、その計測値Ｆ１，Ｆ２が
演算制御手段２３に与えられる。そして、微小動物捕獲
手段２１に導かれる処理水は、ここで含有する微小動物
を捕獲される。The flow rate of each of the distributed treated water is measured by the flow rate measuring means 20 provided immediately after the treated water branching means 19, and the measured values F1 and F2 are given to the arithmetic control means 23. Then, the treated water guided to the micro-animal capturing means 21 captures the micro-animals contained therein.
【００３１】微小動物捕獲手段２１で捕獲された微小動
物は、微小動物計測手段２２においてその数が計測さ
れ、計測値ＡＮが演算制御手段２３に与えられる。The number of micro animals captured by the micro animal capturing means 21 is measured by the micro animal measuring means 22, and the measured value AN is given to the arithmetic control means 23.
【００３２】演算制御手段２３では、各流量計測手段２
０による計測値Ｆ１，Ｆ２と、微小動物計測手段２２に
よる計測値ＡＮとを読み込んで、後述する演算を行な
い、生物活性炭処理槽１０の逆洗時期を制御するための
適正な逆洗実行出力を、生物活性炭処理槽１０の目詰ま
りなどを防止するために行なわれる定期的な逆洗実行周
期（例えば、１週間）に割り込んで出力する。In the arithmetic control means 23, each flow rate measuring means 2
The measured values F1 and F2 of 0 and the measured value AN of the microanimal measuring means 22 are read and the calculation described later is performed to obtain an appropriate backwash execution output for controlling the backwash time of the biological activated carbon treatment tank 10. , The periodical backwashing execution period (for example, one week) that is performed to prevent clogging of the biological activated carbon treatment tank 10 is output.
【００３３】後処理プロセス９は、全系統を合流させ、
この合流してくる被処理水を受けて、塩素注入によるア
ンモニア性窒素の後処理や消毒などを行ない、浄水とし
て出力する。The post-treatment process 9 brings all the lines together,
Upon receiving this combined water to be treated, post-treatment of ammonia nitrogen by chlorine injection, disinfection, etc. are performed and output as purified water.
【００３４】次に、演算制御手段２３の演算処理動作に
ついて、図２のフローチャートに基づいて説明する。Next, the arithmetic processing operation of the arithmetic control means 23 will be described with reference to the flowchart of FIG.
【００３５】まずステップ１０１の制御目標値設定処理
において、生物活性炭処理槽１０から処理水中へ流出す
る微小動物の数の制御目標値を入力する。この目標値
は、本実施例では処理水量１m3当たり１００個とする。First, in the control target value setting process of step 101, the control target value of the number of micro animals flowing out from the biological activated carbon treatment tank 10 into the treated water is input. In this embodiment, this target value is 100 per 1 m3 of treated water.
【００３６】続くステップ１０２では計測データ読み取
り処理を実行し、生物活性炭処理槽１０における処理水
流量Ｆ１，Ｆ２と微小動物数計測値ＡＮのデータを読み
取る。In the following step 102, a measurement data reading process is executed to read the data of the treated water flow rates F1 and F2 in the biological activated carbon treatment tank 10 and the minute animal number measurement value AN.
【００３７】続くステップ１０３では流出数演算処理を
行ない、生物活性炭処理槽１０の処理水流量Ｆ１，Ｆ２
と微小動物捕獲手段２１側に分配される処理水流量Ｆ１
と微小動物数計測値ＡＮとを用いて、各生物活性炭処理
槽１０から流出する微小動物数を単位水量当たりの微小
動物数として計算し、過去のデータ変化率から、次期計
測データ読み取り時の微小動物流出数を予測演算する。In the following step 103, the outflow number calculation processing is performed, and the treated water flow rates F1, F2 of the biological activated carbon treatment tank 10 are
And the treated water flow rate F1 distributed to the micro-animal capturing means 21 side
And the number of micro animals measured AN, the number of micro animals flowing out from each biological activated carbon treatment tank 10 is calculated as the number of micro animals per unit amount of water, and the micro rate at the time of reading the next measurement data is calculated from the past data change rate. Predict and calculate the number of animal outflows.
【００３８】次のステップ１０４では微小動物流出数の
制御目標値判断処理を実行し、ステップ１０３において
出力された微小動物の流出数および予測値のうち、微小
動物の流出数とステップ１０１において入力された制御
目標値とを比較する。そして、微小動物の流出数が制御
目標値以上と判断された場合には、ステップ１０６の逆
洗信号出力処理にて生物活性炭処理槽１０の逆洗信号出
力を行なう。In the next step 104, a control target value determination process for the number of outflows of micro-animals is executed, and among the outflows and predicted values of the micro-animals output in step 103, the outflow number of micro-animals and the input are input in step 101. Compared with the control target value. When it is determined that the number of outflows of microanimals is equal to or larger than the control target value, the backwash signal output processing of the biological activated carbon treatment tank 10 is performed in the backwash signal output processing of step 106.
【００３９】このステップ１０４の判断で、微小動物の
流出数が制御目標値を下回ったと判断された場合には、
ステップ１０５の予測値の制御目標値判断処理に入り、
ステップ１０３で得た微小動物の流出数の予測値と制御
目標値とを比較し、予測値が制御目標値以上と判断され
たときには、ステップ１０６に移り、逆洗信号を出力す
る。If it is determined in step 104 that the number of outflows of micro-animals is below the control target value,
The control target value determination process of the predicted value in step 105 is entered,
The predicted value of the number of outflows of micro-animals obtained in step 103 is compared with the control target value, and when the predicted value is determined to be equal to or higher than the control target value, the process proceeds to step 106 and a backwash signal is output.
【００４０】上記のステップ１０５において微小動物の
流出数の予測値と制御目標値とを比較し、予測値が制御
目標値を下回ったときには、ステップ１０２に戻り、以
上の処理を周期的に繰り返す。In step 105, the predicted value of the number of outflows of micro-animals is compared with the control target value. When the predicted value is below the control target value, the process returns to step 102 and the above processing is repeated cyclically.
【００４１】ステップ１０６では、ステップ１０４また
はステップ１０５の逆洗信号を受け、逆洗信号を出力す
る。In step 106, the backwash signal of step 104 or step 105 is received and the backwash signal is output.
【００４２】続くステップ１０７では逆洗周期適正判断
を行ない、ステップ１０６において出力された逆洗信号
が逆洗周期として適正であるかどうか判断する。これ
は、生物活性炭処理槽１０の逆洗周期が極端に短くなる
のを防止するための処理であり、本実施例の場合には、
前回逆洗実行時より１日未満の逆洗周期となれば逆洗周
期不適と判断し、ステップ１０８の警報出力処理を行な
い、プラント運転員に知らせ、制御目標値が厳し過ぎた
ことに起因する逆洗周期不適であれば、それまでステッ
プ１０３において得られた微小動物流出数をよく検討
し、必要があればステップ１０１において設定されてい
た制御目標値を適正なものに再設定するようにさせる。In the following step 107, a proper backwash cycle is determined, and it is determined whether the backwash signal output in step 106 is appropriate as the backwash cycle. This is a treatment for preventing the backwash cycle of the biological activated carbon treatment tank 10 from becoming extremely short, and in the case of the present embodiment,
If the backwashing cycle is less than one day from the previous backwashing execution, it is determined that the backwashing cycle is unsuitable, the warning output process of step 108 is performed, the plant operator is notified, and the control target value is too strict. If the backwash cycle is not suitable, the number of outflows of micro-animals obtained up to that time in step 103 is carefully examined, and if necessary, the control target value set in step 101 is reset to an appropriate value. ..
【００４３】ステップ１０７において逆洗周期が適正と
判断されれば、ステップ１０９の逆洗割込出力処理を行
ない、定期的に逆洗を行なうシステムに割り込み信号Ａ
Ｖを出力し、生物活性炭処理槽１０の逆洗を実行する。If the backwash cycle is judged to be appropriate in step 107, the backwash interrupt output processing of step 109 is performed to interrupt the signal A to the system which regularly performs backwash.
V is output and the backwashing of the biological activated carbon treatment tank 10 is executed.
【００４４】図３は本実施例の生物活性炭処理槽の逆洗
制御装置において、生物活性炭処理槽１０から流出して
きた微小動物を微小動物計測手段２２によって１年間計
測した結果を３カ月の季節平均値として示したものであ
る。FIG. 3 shows the result of measuring the minute animals flowing out from the biological activated carbon treatment tank 10 for one year by the minute animal measuring means 22 in the backwash control apparatus for the biological activated carbon treatment tank of this embodiment, and the seasonal average of three months. It is shown as a value.
【００４５】従来の一定の固定周期で行なう逆洗方法で
は、春季から夏季にかけて微小動物の流出数が５００〜
１０００個／m3程度に達していたが、本実施例では年間
を通して生物活性炭処理槽１０から流出する微小動物数
を１００個／m3程度以下に抑制することができるように
なった。In the conventional backwashing method which is carried out at a fixed cycle, the number of outflows of micro-animals is 500-500 from spring to summer.
Although it reached about 1000 animals / m3, in this embodiment, the number of micro animals flowing out from the biological activated carbon treatment tank 10 can be suppressed to about 100 animals / m3 or less throughout the year.
【００４６】なお、本実施例では、ステップ１０２の計
測データ読み取り周期は半日（１２時間）を基本として
いるが、春季から夏季にかけての高温期にはステップ１
０２の計測データ読み取り周期を短縮することにより、
ステップ１０３における微小動物数の流出数および予測
値の演算処理精度を向上させることができ、生物活性炭
処理槽１０の逆洗周期をきめ細かく制御することができ
る。In this embodiment, the measurement data reading cycle in step 102 is basically half a day (12 hours), but in the high temperature period from spring to summer, step 1
By shortening the measurement data reading cycle of 02,
It is possible to improve the calculation accuracy of the number of outflows of minute animals and the predicted value in step 103, and it is possible to finely control the backwash cycle of the biological activated carbon treatment tank 10.
【００４７】また、処理水分岐手段１９において微小動
物捕獲手段２１に分配される処理水の流量を多くするこ
とにより、ステップ１０３における微小動物数の流出数
および予測値の演算処理精度を向上させることができ
る。Further, by increasing the flow rate of the treated water distributed to the small animal catching means 21 in the treated water branching means 19, the accuracy of calculation processing of the outflow number of the small animals and the predicted value in step 103 is improved. You can
【００４８】なお、上記の実施例では微小動物の計測値
が設定値以上になった場合の他に、計測値の予測値が設
定値以上になった場合にも逆洗を行うようにすることに
より、より厳密な制御を行うようにしているが、簡単に
設定値以上になった場合だけ逆洗するようにすることも
できる。In the above embodiment, backwashing is performed not only when the measured value of the small animal exceeds the set value but also when the predicted value of the measured value exceeds the set value. Thus, the stricter control is performed, but it is also possible to easily perform the backwash only when the value exceeds the set value.
【００４９】[0049]
【発明の効果】以上のようにこの発明によれば、生物活
性炭処理槽から流出する処理水中の微小動物の数を計測
して、所定値以上であれば生物活性炭処理槽の逆洗を行
なうようにしているため、生物活性炭処理槽から流出す
る処理水中の微小動物の存在量を適正なものに抑制する
ことができ、飲用水中に微小動物が多く混在して不快感
を与えることがなく、常に清澄な水を提供することがで
きるようになる。As described above, according to the present invention, the number of microanimals in the treated water flowing out from the biological activated carbon treatment tank is measured, and if it is a predetermined value or more, the biological activated carbon treatment tank is backwashed. Therefore, it is possible to suppress the abundance of microanimals in the treated water flowing out of the biological activated carbon treatment tank to an appropriate amount, without causing discomfort due to many microanimals being mixed in the drinking water, You will always be able to provide clear water.
【図１】この発明の生物活性炭処理槽の逆洗制御装置の
一実施例のブロック図。FIG. 1 is a block diagram of an embodiment of a backwash control device for a biological activated carbon treatment tank according to the present invention.
【図２】上記実施例における演算制御手段の処理動作を
示すフローチャート。FIG. 2 is a flowchart showing the processing operation of the arithmetic control means in the above embodiment.
【図３】上記実施例により得られる処理水中の微小動物
流出数の年間推移を示すグラフ。FIG. 3 is a graph showing an annual transition of the number of outflows of micro-animals in treated water obtained in the above example.
【図４】一般的な高度浄水処理のフローチャート。FIG. 4 is a flowchart of general advanced water purification treatment.
６ 前処理プロセス ７ 生物活性炭処理装置 ８ 演算制御システム ９ 後処理プロセス １０ 生物活性炭処理槽 １６ 支持体 １７ 生物活性炭 １８ 流量調節弁 １９ 処理水分岐手段 ２０ 流量計測手段 ２１ 微小動物捕獲手段 ２２ 微小動物計測手段 ２３ 演算制御手段 6 Pretreatment Process 7 Bio-Activated Carbon Treatment Device 8 Operation Control System 9 Post-Treatment Process 10 Bio-Activated Carbon Treatment Tank 16 Support 17 Bio-Activated Carbon 18 Flow Control Valve 19 Treated Water Branching Means 20 Flow Measurement Means 21 Micro Animal Capture Means 22 Micro Animal Measurement Means 23 Arithmetic control means
Claims (2)
槽と、 前記生物活性炭処理槽から流出する処理水中の単位水量
当たりに存在する微小動物の数を計測する微小動物計測
手段と、 前記微小動物計測手段の計測信号に基づき、前記生物活
性炭処理槽の逆洗時期を制御する演算制御手段とを備え
て成る生物活性炭処理槽の逆洗制御装置。1. A biological activated carbon treatment tank filled with biological activated carbon, a micro animal measuring means for measuring the number of micro animals existing per unit amount of water in the treated water flowing out from the biological activated carbon treatment tank, and the micro animals. A backwash control device for a biological activated carbon treatment tank, comprising: arithmetic control means for controlling a backwash time of the biological activated carbon treatment tank based on a measurement signal from the measuring means.
洗制御装置において、前記微小動物計測手段を、生物活
性炭処理槽から流出する処理水を分岐する分岐手段と、
この分岐手段によって分流された処理水の流量を測定す
る流量計測手段と、前記分岐手段によって分流された処
理水中に存在する微小動物を捕獲する微小動物捕獲手段
と、この微小動物捕獲手段が捕獲した微小動物の数を計
測する微小動物数計測手段と、前記流量計測手段の計測
出力と前記微小動物数計測手段の計測出力に基づいて前
記生物活性炭処理槽から流出する処理水中にその単位水
量当たりに存在する微小動物数を演算する微小動物数演
算手段とから構成して成ることを特徴とする生物活性炭
処理槽の逆洗制御装置。2. The backwash control device for a biological activated carbon treatment tank according to claim 1, wherein the micro animal measuring means comprises a branch means for branching the treated water flowing out from the biological activated carbon treatment tank.
The flow rate measuring means for measuring the flow rate of the treated water divided by the branching means, the micro animal capturing means for capturing the micro animals existing in the treated water divided by the branching means, and the micro animal capturing means A micro-animal number measuring means for measuring the number of micro-animals, based on the measurement output of the flow rate measuring means and the measurement output of the micro-animal number measuring means in the treated water flowing out of the biological activated carbon treatment tank per unit amount of water. A backwashing control device for a biological activated carbon treatment tank, characterized in that it comprises a means for calculating the number of existing microanimals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3321584A JPH05154489A (en) | 1991-12-05 | 1991-12-05 | Backwash controller for biological activated carbon treatment tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3321584A JPH05154489A (en) | 1991-12-05 | 1991-12-05 | Backwash controller for biological activated carbon treatment tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05154489A true JPH05154489A (en) | 1993-06-22 |
Family
ID=18134187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3321584A Pending JPH05154489A (en) | 1991-12-05 | 1991-12-05 | Backwash controller for biological activated carbon treatment tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05154489A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720119A (en) * | 1993-07-06 | 1995-01-24 | Hitachi Ltd | Method and system for supporting management of water purification plant |
| KR20030021022A (en) * | 2001-09-05 | 2003-03-12 | 주식회사 유니테크 | A sewage water treatment system and method, using activated carbon fiber |
-
1991
- 1991-12-05 JP JP3321584A patent/JPH05154489A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720119A (en) * | 1993-07-06 | 1995-01-24 | Hitachi Ltd | Method and system for supporting management of water purification plant |
| KR20030021022A (en) * | 2001-09-05 | 2003-03-12 | 주식회사 유니테크 | A sewage water treatment system and method, using activated carbon fiber |
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