JP2004154746A - Chloride concentration regulating system for well water purifying facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that the chlorine concentration often drops down to a prescribed value or below by vaporization of chlorine so that much of the treated water stored must be discarded and newly treated water should be supplied to business use, swimming pools, etc., in the case the treated water stored in a treated water tank placed behind a purification treatment system is left without being used for a prolonged time in the night or on many other occasions. <P>SOLUTION: While the treated water in the treated water tank is continuously or intermittently circulated by a pump in a time zone when the water is not fed to consumers, the chlorine concentration is measured. When the chlorine concentration drops to the administratively predetermined value , sodium hypochlorite is added to the circulating treated water in such a manner that the chlorine concentration of the treated water in the treated water tank increases gradually. At the time when the restoration of the chlorine concentration is made certain, the dosage of the chlorine is stopped, thus the chlorine concentration is maintained within the prescribed range all the time. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、井戸水（以下、井水と略）を浄化して業務用上水、水泳用プール等に供給する水処理システムに関する。
【０００２】
【従来の技術】
水処理は環境重視の現代にあって有望産業として注目されており、特許文献及び一般文献共極めて多数存在している。それらの中には本発明になる水処理システムに構成要素が比較的近い発明も幾つか存在する（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
特開２００２−１５３８７９号公報（要約、図１）
【０００４】
水処理システムには水に関する諸特性を法規等で定められた規格範囲に収めるように処理をするという共通項がある。これらの諸特性としてｐＨ、ＢＯＤ、ＳＳ等があるが、本発明が対象とするのは塩素濃度である。
【０００５】
良好な井水が大量に得られる地域では業務用上水として、または水泳用のプール用水として、井水が利用されることが多い。この場合、井水はフィルター等による砂、鉄分、マンガン分等の処理の後、衛生法規の要求により強力な殺菌作用を有する塩素を注入して、例えば塩素濃度を０．５ｐｐｍ以上２．０ｐｐｍ以下に調整・保持しなければならない。
【０００６】
【発明が解決しようとする課題】
現行方式では前述のように処理された井水は最終需要先に供給される前に、供給用バッファーとして一旦数十トン級の容量を有する処理水タンクに貯溜され、水需要に応じてポンプにより送水されて需要先に届けられる。
【０００７】
図２は現行の一般的な井水浄化供給システムを説明する図である。図２において井戸１より取水ポンプ２により汲み上げられた井水は水処理設備３により処理され、注水ポート４より処理水タンク５に入り、一時貯溜される。この水は取水ポート６より取り出され、送水ポンプ７により需要先９へ送水されるが、ポンプ７の直後に設置された塩素濃度検出器８により前述塩素濃度が規定値に収まっているか否かを監視されている。
【０００８】
この方式では水処理量と需要量のバランスがとれている時点では全く問題はないが、給水要求がない時間帯に処理水は滞留せざるを得ず、その間に塩素の一部が気化して塩素濃度が下がる。塩素濃度が規定値より下がると法規により送水出来なくなり、一旦処理水を廃棄して新たに規定値を満足する処理水を処理水タンクに供給せねばならず、設備の運転効率の観点から非常に問題がある。特に夜間の使用量が零となる水泳用プールでは比較的頻繁にこのような事態が発生しており、改善が望まれていた。
【０００９】
処理水タンクの容量が大きいため、塩素濃度の局部的バラツキが存在し、暫く送水すると規定値を満足する範囲に戻ることもあり得るため、塩素濃度検出器８からのアラーム信号の出力をタイマーで遅らせている場合もあるが、対策として姑息であり、本質的な対処法とはいえない。
【００１０】
【課題を解決するための手段】
従来方式には処理水タンクにおける処理水の滞留時間と塩素濃度低下に対応できる制御が皆無であったために前述のような問題が発生した。制御方式としては処理水タンク５から塩素濃度検出器８までの間はオープンループ制御となっており、塩素濃度低下に対しての対策がない。本発明ではこの区間に塩素濃度に関するクローズドループ制御を実行することにより前述の問題を解決する。
【００１１】
【発明の実施の形態】
本発明になる井水の処理水タンクから取水される処理水の塩素濃度調節システムの実施の形態を図１を参照して詳細に説明する。
【００１２】
給水ポンプ７はＶＶＶＦインバータ等によって駆動される可変速電動ポンプである。給水ポンプ７によって送水された処理水は塩素濃度検出器８を経て３方切替弁１１に到る。
塩素濃度検出器８は塩素濃度が規格下限値から勘案して運営上定めた値以上の場合は正常信号を、前述定めた値を下回る場合は異常信号を制御装置１０に伝達する。
制御装置１０は以下述べる３方切替弁１１の電動操作と塩素注入装置１３の注入ポンプの電動駆動と前述給水ポンプ７の可変速電動機を駆動するＶＶＶＦインバータ等によって構成された装置の総体である。
【００１３】
この給水系統の運転の様態を以下に説明する。図１は給水要求がない時間帯であって、給水ポンプ７から送水された処理水は３方切替弁１１により循環水管路１２に向かって流れ、循環水ポート１４より処理水タンク５に戻る状況を示している。制御装置１０が塩素濃度検出器８より塩素濃度が正常であるとの信号を受け取っている場合は、このような処理水の循環が低水量で連続的に、或いは間欠的に行うため、制御装置１０のＶＶＶＦインバータは水の需要時間帯におけるよりも低い回転速度で給水ポンプ７の可変速電動機を駆動する。このようにして、処理水タンク５の内部の処理水を緩やかに循環・攪拌し、塩素濃度の局部的偏在が発生しないように運転管理されている。
【００１４】
制御装置１０が塩素濃度検出器８より塩素濃度が前述定めた値を割り込んだとの異常信号を受け取った場合は、直ちに制御装置１０は塩素注入装置１３の塩素注入ポンプを駆動して塩素供給物質である次亜塩素酸ソーダ液を適量循環水管路１２の水流に注入・混合する。
【００１５】
次亜塩素酸ソーダの注入を受けて塩素濃度が上昇した循環水管路１２を流れる処理水は、循環水ポート１４より処理水タンク５に戻される。このような循環運転を適当な時間にわたって実行すると次第に塩素濃度が上昇し、前述定めた値を越えたか越えることが確実と推定された時点で塩素濃度検知器８が正常信号を発信し、それを受けた制御装置１０は若干の余裕運転を行なった後に塩素注入装置１３の塩素注入ポンプの運転を停止する。
【００１６】
処理水タンク５の容量は大きいため、処理水の循環中にこの中に貯溜されている処理水の塩素濃度の偏在をなくし均質化するためには、処理水タンク５の取水ポートと循環水ポートはなるべく離れていることが望ましく、夫々が処理水タンク５の最長対角線コーナーに設けられるのが好適である。
【００１７】
また、処理水タンク５内の大量の処理水は以上に説明した塩素濃度のクローズドループ制御系のタイムラグ要素であるから、オーバーシュート現象により不必要に塩素濃度を上げ過ぎないように、制御装置１０はシーケンス制御装置等により予測制御要素を含むプログラミングを施しておくことが望ましい。
【００１８】
水の需要時間帯になると、図１の３方切替弁１１は給水ポンプ７からの処理水を需要先９へ給水するように切り替えられる。この直前まで処理水は連続的、或いは間欠的に循環し、塩素濃度は前述定めた値以上に維持され、かつ、処理水タンク５内の塩素濃度の均質化が行なわれていたので、この給水系統が需要先へ給水する際は塩素濃度検出器８は監視を続けるが、塩素濃度の異常が発生することは起り得ない。
【００１９】
【発明の効果】
この発明になる井水浄化装置の塩素濃度調整システムは以上説明したように構成されているので、完全自動で塩素濃度の適正値保持を保証できる。
【００２０】
また、この発明の井水浄化装置の塩素濃度調整システムによれば、現行の多くの処理水タンクで時々発生している塩素濃度が規定値を下回った場合に貯留した処理水の多くを廃棄して新しく処理水を供給するための無駄な作業と、地下水の無駄な取水と、取水と処理のための無駄な電力や次亜塩素酸ソーダ等の資材の無駄な使用を防止することができる。
【図面の簡単な説明】
【図１】本発明になる請求項１に相当する実施例の図である。
【図２】現行の一般的な井水浄化供給システムを説明する図である。
【符号の説明】
１ 井戸
２ 取水ポンプ
３ 水処理装置
４ 給水ポート
５ 処理水タンク
６ 取水ポート
７ 給水ポンプ
８ 塩素濃度検出器
９ 需要先
１０ 制御装置
１１ ３方切替弁
１２ 循環水管路
１３ 塩素注入装置
１４ 循環水ポート[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water treatment system for purifying well water (hereinafter abbreviated as well water) and supplying the purified water to commercial water, a swimming pool, and the like.
[0002]
[Prior art]
Water treatment has been attracting attention as a promising industry in the environment-conscious modern age, and there are a great many patent documents and general documents. Among them, there are some inventions whose components are relatively close to the water treatment system according to the present invention (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-153879 (abstract, FIG. 1)
[0004]
A common feature of water treatment systems is to treat various characteristics of water so that they fall within the standard range defined by laws and regulations. These properties include pH, BOD, SS, etc., but the present invention is directed to the chlorine concentration.
[0005]
In an area where a large quantity of good well water is obtained, well water is often used as business water or swimming pool water. In this case, the well water is treated with sand, iron, manganese, etc. by a filter or the like, and then injected with chlorine having a strong bactericidal action according to the requirements of sanitary regulations, for example, the chlorine concentration is 0.5 ppm or more and 2.0 ppm or less. Must be adjusted and maintained.
[0006]
[Problems to be solved by the invention]
In the current method, well water treated as described above is temporarily stored as a supply buffer in a treated water tank with a capacity of several tens of tons before being supplied to the final demand destination, and is pumped according to water demand. The water is sent to the destination.
[0007]
FIG. 2 is a diagram illustrating a current general well water purification and supply system. In FIG. 2, well water pumped up from a well 1 by an intake pump 2 is treated by a water treatment facility 3, enters a treated water tank 5 from a water injection port 4, and is temporarily stored. This water is taken out from the water intake port 6 and sent to the demand destination 9 by the water pump 7. The chlorine concentration detector 8 installed immediately after the pump 7 determines whether or not the chlorine concentration is within a specified value. Being monitored.
[0008]
In this method, there is no problem at the time when the amount of water treatment and the amount of demand are balanced, but the treated water has to stay in the time when there is no demand for water supply, during which part of the chlorine evaporates. Chlorine concentration decreases. If the chlorine concentration falls below the specified value, it becomes impossible to send water due to laws and regulations, and it is necessary to discard the treated water once and supply treated water that newly satisfies the specified value to the treated water tank, which is extremely difficult from the viewpoint of equipment operation efficiency. There's a problem. In particular, such a situation occurs relatively frequently in a swimming pool in which nighttime usage becomes zero, and improvement has been desired.
[0009]
Since the capacity of the treated water tank is large, there is a local variation in the chlorine concentration, and if the water is supplied for a while, it may return to the range satisfying the specified value. Therefore, the alarm signal output from the chlorine concentration detector 8 is output by a timer. Although it may be delayed, it is a palliative measure and is not an essential solution.
[0010]
[Means for Solving the Problems]
In the conventional method, there was no control capable of coping with the residence time of the treated water in the treated water tank and a decrease in the chlorine concentration, and thus the above-described problem occurred. As a control method, open loop control is performed between the treated water tank 5 and the chlorine concentration detector 8, and there is no measure against a decrease in chlorine concentration. In the present invention, the above-mentioned problem is solved by executing closed loop control relating to the chlorine concentration in this section.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a chlorine concentration adjusting system for treated water taken from a treated water tank of well water according to the present invention will be described in detail with reference to FIG.
[0012]
The water supply pump 7 is a variable speed electric pump driven by a VVVF inverter or the like. The treated water sent by the water supply pump 7 reaches the three-way switching valve 11 via the chlorine concentration detector 8.
The chlorine concentration detector 8 transmits a normal signal to the control device 10 when the chlorine concentration is equal to or more than an operationally determined value in consideration of the lower limit of the standard, and transmits an abnormal signal to the controller 10 when the chlorine concentration is lower than the predetermined value.
The control device 10 is a whole device constituted by an electric operation of a three-way switching valve 11 described below, an electric drive of an injection pump of the chlorine injection device 13, a VVVF inverter for driving a variable speed electric motor of the water supply pump 7, and the like.
[0013]
The manner of operation of the water supply system will be described below. FIG. 1 shows a time period in which there is no water supply request, in which treated water sent from the water supply pump 7 flows toward the circulating water pipe 12 by the three-way switching valve 11 and returns to the treated water tank 5 from the circulating water port 14. Is shown. When the control device 10 receives a signal indicating that the chlorine concentration is normal from the chlorine concentration detector 8, the circulation of the treated water is performed continuously or intermittently at a low flow rate. The VVVF inverter 10 drives the variable speed motor of the feed pump 7 at a lower rotational speed than during the water demand time zone. In this way, the treated water inside the treated water tank 5 is gently circulated and agitated, and the operation is controlled so as to prevent local uneven distribution of chlorine concentration.
[0014]
When the control device 10 receives an abnormal signal from the chlorine concentration detector 8 indicating that the chlorine concentration has dropped below the predetermined value, the control device 10 immediately drives the chlorine injection pump of the chlorine injection device 13 to activate the chlorine supply material. Is injected and mixed into the water stream of the circulating water pipe 12 in an appropriate amount.
[0015]
The treated water flowing through the circulating water pipe 12 whose chlorine concentration has increased due to the injection of sodium hypochlorite is returned to the treated water tank 5 through the circulating water port 14. When such a circulation operation is performed for an appropriate period of time, the chlorine concentration gradually rises, and when it is estimated that the chlorine concentration exceeds or exceeds the predetermined value, the chlorine concentration detector 8 transmits a normal signal, and the normal signal is transmitted. After receiving the marginal operation, the control device 10 stops the operation of the chlorine injection pump of the chlorine injection device 13.
[0016]
Since the capacity of the treated water tank 5 is large, in order to eliminate uneven distribution of the chlorine concentration of the treated water stored therein during the circulation of the treated water and homogenize it, the intake port and the circulating water port of the treated water tank 5 are required. Are desirably as far apart as possible, and each is preferably provided at the longest diagonal corner of the treated water tank 5.
[0017]
Further, since the large amount of treated water in the treated water tank 5 is a time lag element of the closed loop control system for the chlorine concentration described above, the control device 10 is designed not to unnecessarily increase the chlorine concentration due to the overshoot phenomenon. It is desirable that programming including a predictive control element be performed by a sequence controller or the like.
[0018]
In the water demand time zone, the three-way switching valve 11 in FIG. 1 is switched to supply the treated water from the water supply pump 7 to the demand destination 9. Immediately before this, the treated water circulates continuously or intermittently, the chlorine concentration is maintained at or above the above-specified value, and the chlorine concentration in the treated water tank 5 has been homogenized. When the system supplies water to the demand destination, the chlorine concentration detector 8 keeps monitoring, but it does not occur that the chlorine concentration abnormality occurs.
[0019]
【The invention's effect】
Since the chlorine concentration adjusting system of the well water purifying apparatus according to the present invention is configured as described above, it is possible to completely automatically maintain the proper value of the chlorine concentration.
[0020]
Further, according to the chlorine concentration adjusting system of the well water purification device of the present invention, when the chlorine concentration occasionally generated in many current treated water tanks falls below a specified value, much of the stored treated water is discarded. It is possible to prevent wasteful work for supplying newly treated water, useless use of groundwater, useless power for use in water intake and treatment, and useless use of materials such as sodium hypochlorite.
[Brief description of the drawings]
FIG. 1 is a diagram of an embodiment corresponding to claim 1 of the present invention.
FIG. 2 is a diagram illustrating a current general well water purification and supply system.
[Explanation of symbols]
Reference Signs List 1 Well 2 Intake pump 3 Water treatment device 4 Water supply port 5 Treated water tank 6 Intake port 7 Water supply pump 8 Chlorine concentration detector 9 Demand destination 10 Control device 11 Three-way switching valve 12 Circulating water line 13 Chlorine injection device 14 Circulating water port

Claims (1)

井水浄化装置より供給された処理水を一時貯溜する処理水タンクからポンプにより取水して需要先へ送水する給水系統において、
需要先への送水が行われない時間帯においては連続、もしくは間欠的に前述処理水タンクに対して前述ポンプによる処理水の循環を行うようにしてなり、
前述ポンプが循環或いは送水する処理水の塩素濃度を塩素濃度検出器により測定し、
処理水の循環を行っている時間帯において塩素濃度が定めた値を下回った場合は循環する処理水に適量の塩素供給物質を注入して次第に処理水タンク内の塩素濃度が上昇するようにし、
処理水の塩素濃度が前述定めた値まで復帰するか復帰することが確実と推定されれば前述塩素供給物質の注入を停止するように構成してなる塩素濃度調整システム。In a water supply system that pumps water from a treated water tank that temporarily stores treated water supplied from a well water purification device and sends it to a demand destination,
During the time when water is not supplied to the demand destination, the process water is circulated by the pump continuously or intermittently to the process water tank,
Measure the chlorine concentration of the treated water circulated or fed by the pump with a chlorine concentration detector,
If the chlorine concentration falls below the specified value during the circulating process water, an appropriate amount of chlorine supply substance is injected into the circulating treated water so that the chlorine concentration in the treated water tank gradually increases,
A chlorine concentration adjusting system configured to stop the injection of the chlorine supply material if the chlorine concentration of the treated water returns to the predetermined value or is estimated to return to the predetermined value.

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