JP2013202599A - Waste water treatment device and method - Google Patents

Waste water treatment device and method Download PDF

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JP2013202599A
JP2013202599A JP2012078031A JP2012078031A JP2013202599A JP 2013202599 A JP2013202599 A JP 2013202599A JP 2012078031 A JP2012078031 A JP 2012078031A JP 2012078031 A JP2012078031 A JP 2012078031A JP 2013202599 A JP2013202599 A JP 2013202599A
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valve
opening
waste water
treatment apparatus
supply line
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JP5684185B2 (en
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Tadao Shioda
忠雄 塩田
Toshiki Takemoto
敏樹 竹本
Koryo Sagawa
公亮 佐川
Hiroshi Mantani
博史 万谷
Shinji Takeda
伸治 武田
Masanori Ozono
正則 大薗
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Chugoku Electric Power Co Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a waste water treatment device and method preventing disturbance to pH adjustment control caused by seat leakage of a regulating valve.SOLUTION: In a waste water treatment device 10, a first on-off valve 112 is installed upstream of a first regulating valve 111 provided in an acid supply line 110, and based on an opening of the first regulating valve 111, the first on-off valve 112 is opened/closed. A second on-off valve 122 is installed upstream of a second regulating valve 121 provided in an alkali supply line 120, and based on an opening of the second regulating valve 121, the second on-off valve 122 is opened/closed. The waste water treatment device 10 determines the opening of the first regulating valve 111 on the basis of pH measured by a pH measurement part 131 and determines the opening of the second regulating valve 121 on the basis of the pH measured by the pH measurement part 131.

Description

本発明は、排水処理装置及び方法に関する。   The present invention relates to a wastewater treatment apparatus and method.

従来より、発電プラント等においては、一定の排水処理が行われ、排水基準を満たすように処理された水が放流されている。この排水処理のうちｐＨ値が排水基準を満たすようにする処理は、調整槽や、中和槽を設け、薬品（例えば、塩酸や苛性ソーダ等）を注入して中和処理が行われる。このような排水処理において、排水処理の効率を高め性能を向上させるための技術を開示する特許文献１や２が知られている。   Conventionally, in a power plant or the like, a certain amount of waste water treatment is performed, and water treated so as to satisfy the waste water standard is discharged. Among these wastewater treatments, the treatment for adjusting the pH value to the wastewater standard is carried out by providing an adjustment tank or a neutralization tank and injecting chemicals (for example, hydrochloric acid, caustic soda, etc.) to perform the neutralization treatment. In such wastewater treatment, Patent Documents 1 and 2 that disclose techniques for increasing the efficiency of wastewater treatment and improving performance are known.

特許文献１には、排水処理効率を高め、設備全体の大幅な小型化を図る排水処理装置が開示されている。この排水処理装置は、排水を給送するポンプと、配管内に薬液を供給する薬液供給手段と、薬液供給位置より下流側に配設されたＯＲＰ計及びｐＨ電極と、制御手段とを備え、制御手段は、ＯＲＰ計及びｐＨ電極の検出値に対応して、薬液供給手段のバルブ開度を自動的に制御し、排水のｐＨ調整及びクロム還元を行う。   Patent Document 1 discloses a wastewater treatment apparatus that improves wastewater treatment efficiency and significantly reduces the size of the entire facility. This waste water treatment apparatus includes a pump for feeding waste water, a chemical liquid supply means for supplying a chemical liquid into the pipe, an ORP meter and a pH electrode disposed downstream from the chemical liquid supply position, and a control means. The control means automatically controls the valve opening degree of the chemical solution supply means in accordance with the detected values of the ORP meter and the pH electrode, thereby adjusting the pH of the waste water and reducing chromium.

特許文献２には、排水処理装置の性能を低下させないような水質の排煙脱硫排水を排水処理装置に送水するための前処理装置が開示されている。この前処理装置は、制御装置を備えていて、濃度計の測定値に基づき所定の相関関係に従って、流量調節弁を介してスチーム流量を調整することにより原水の温度を制御し、流量調節弁を介して酸の注入流量を調整することにより原水のｐＨを調節する。また、混合槽内の液の温度、ｐＨを計測し、流量調節弁の開度調整も同時に行う。   Patent Document 2 discloses a pretreatment device for supplying water-type flue gas desulfurization wastewater that does not deteriorate the performance of the wastewater treatment device to the wastewater treatment device. This pretreatment device is provided with a control device, controls the temperature of the raw water by adjusting the steam flow rate via the flow rate control valve according to a predetermined correlation based on the measured value of the densitometer, and sets the flow rate control valve. The pH of the raw water is adjusted by adjusting the flow rate of the acid via. In addition, the temperature and pH of the liquid in the mixing tank are measured, and the opening degree of the flow control valve is adjusted at the same time.

特開平７−１００４７１号公報Japanese Patent Application Laid-Open No. 7-1000047 特開平８−２８１２９６号公報JP-A-8-281296

このように、排水処理のｐＨ調整制御において、計測器の検出値に基づいて調整弁の開閉を行って薬品の注入を制御する技術は、特許文献１や２に開示されている。
しかしながら、排水処理のｐＨ調整制御において、制御の追従性を向上させるために、調整弁のシートリークによる制御への外乱を防止する技術は知られていない。 Thus, in the pH adjustment control of waste water treatment, the technique which controls injection | pouring of a chemical | medical agent by opening and closing a regulating valve based on the detected value of a measuring device is disclosed by patent document 1 or 2. FIG.
However, in the pH adjustment control of waste water treatment, there is no known technique for preventing disturbance to the control due to the seat leak of the adjustment valve in order to improve the followability of the control.

そこで、調整弁のシートリークによるｐＨ調整制御への外乱を防止するようにした排水処理装置及び方法が求められている。   Therefore, there is a need for a wastewater treatment apparatus and method that prevent disturbance to pH adjustment control due to seat leakage of the regulating valve.

本発明は、調整弁のシートリークによるｐＨ調整制御への外乱を防止するようにした排水処理装置及び方法を提供することを目的とする。   It is an object of the present invention to provide a wastewater treatment apparatus and method that prevent disturbance to pH adjustment control due to seat leakage of a regulating valve.

本発明では、以下のような解決手段を提供する。
（１） 処理槽のｐＨを調整する排水処理装置であって、前記処理槽に酸性の液体を供給する酸供給ラインと、前記処理槽にアルカリ性の液体を供給するアルカリ供給ラインと、前記酸供給ラインに設けられる第１調整弁と、前記アルカリ供給ラインに設けられる第２調整弁と、前記第１調整弁の上流側に設けられる第１開閉弁と、前記第２調整弁の上流側に設けられる第２開閉弁と、前記第１調整弁の開度に基づいて前記第１開閉弁を開閉させる酸制御部と、前記第２調整弁の開度に基づいて前記第２開閉弁を開閉させるアルカリ制御部と、を備える排水処理装置。 The present invention provides the following solutions.
(1) A wastewater treatment apparatus for adjusting the pH of a treatment tank, an acid supply line for supplying an acidic liquid to the treatment tank, an alkali supply line for supplying an alkaline liquid to the treatment tank, and the acid supply A first regulating valve provided in the line, a second regulating valve provided in the alkali supply line, a first on-off valve provided upstream of the first regulating valve, and provided upstream of the second regulating valve. A second on-off valve that is opened, an acid control unit that opens and closes the first on-off valve based on the opening of the first adjustment valve, and an opening and closing of the second on-off valve based on the opening of the second adjustment valve A wastewater treatment device comprising an alkali control unit.

（１）の構成によれば、本発明に係る排水処理装置は、酸供給ラインに設けられる第１調整弁の上流側に第１開閉弁を設け、第１調整弁の開度に基づいて第１開閉弁を開閉させ、アルカリ供給ラインに設けられる第２調整弁の上流側に第２開閉弁を設け、第２調整弁の開度に基づいて第２開閉弁を開閉させる。   According to the configuration of (1), the waste water treatment apparatus according to the present invention provides the first on-off valve on the upstream side of the first adjustment valve provided in the acid supply line, and the first on-off valve based on the opening of the first adjustment valve. The first on-off valve is opened and closed, the second on-off valve is provided on the upstream side of the second adjustment valve provided in the alkali supply line, and the second on-off valve is opened and closed based on the opening of the second adjustment valve.

したがって、本発明に係る排水処理装置は、調整弁の開度に基づいて、調整弁の上流側に設けた開閉弁を開閉させるので、調整弁の負担を軽減させ、調整弁のシートリークによるｐＨ調整制御への外乱を防止することができる。   Therefore, the wastewater treatment apparatus according to the present invention opens and closes the on-off valve provided on the upstream side of the regulating valve based on the opening of the regulating valve, thereby reducing the burden on the regulating valve and reducing the pH due to seat leakage of the regulating valve. The disturbance to the adjustment control can be prevented.

（２） ｐＨを測定するｐＨ測定部をさらに備え、前記酸制御部は、前記ｐＨ測定部により測定されたｐＨに基づいて前記第１調整弁の開度を決定し、前記アルカリ制御部は、前記ｐＨ測定部により測定されたｐＨに基づいて前記第２調整弁の開度を決定する、（１）に記載の排水処理装置。   (2) It further includes a pH measurement unit that measures pH, the acid control unit determines the opening of the first regulating valve based on the pH measured by the pH measurement unit, and the alkali control unit includes: The waste water treatment apparatus according to (1), wherein an opening degree of the second adjustment valve is determined based on a pH measured by the pH measurement unit.

したがって、（２）に係る排水処理装置は、測定したｐＨに基づいて調整弁の開度を決定するので、調整弁のシートリークによるｐＨ調整制御への外乱が開閉弁によって防止されている状態で、処理槽のｐＨ調整制御の追従性をさらに向上させることができる。   Therefore, the waste water treatment apparatus according to (2) determines the opening degree of the regulating valve based on the measured pH, so that disturbance to the pH regulation control due to seat leakage of the regulating valve is prevented by the on-off valve. The followability of the pH adjustment control of the treatment tank can be further improved.

（３） （１）に記載の排水処理装置が実行する方法であって、前記酸制御部が、前記第１調整弁の開度に基づいて前記第１開閉弁を開閉させるステップと、前記アルカリ制御部が、前記第２調整弁の開度に基づいて前記第２開閉弁を開閉させるステップと、を備える方法。   (3) The method executed by the waste water treatment apparatus according to (1), wherein the acid control unit opens and closes the first on-off valve based on an opening degree of the first adjustment valve, and the alkali And a step of opening and closing the second on-off valve based on an opening degree of the second adjustment valve.

したがって、（３）に係る方法は、（１）と同様に、調整弁の負担を軽減させ、調整弁のシートリークによるｐＨ調整制御への外乱を防止することができる。   Therefore, similarly to (1), the method according to (3) can reduce the burden on the adjustment valve and prevent disturbance to the pH adjustment control due to the seat leak of the adjustment valve.

本発明によれば、調整弁のシートリークによるｐＨ調整制御への外乱を防止することができる。   According to the present invention, it is possible to prevent disturbance to pH adjustment control due to seat leakage of the regulating valve.

本発明の一実施形態に係る排水処理装置の薬品注入系統を示す図である。It is a figure which shows the chemical | medical agent injection | pouring system | strain of the waste water treatment apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態に係る排水処理装置の制御部の処理内容を示すフローチャートである。It is a flowchart which shows the processing content of the control part of the waste water treatment equipment which concerns on one Embodiment of this invention.

以下、本発明の実施形態について図を参照しながら説明する。図１は、本発明の一実施形態に係る排水処理装置１０の薬品注入系統を示す図である。発電プラント１の各発電工程等において排出された排水は、例えば、調整槽３０１ａや中和槽３０１ｂ（以下、処理槽３０１という。）に導かれ、排水処理装置１０は、処理槽３０１のｐＨ値が排水基準を満たすように排水処理を行う。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a chemical injection system of a wastewater treatment apparatus 10 according to an embodiment of the present invention. The wastewater discharged in each power generation process or the like of the power plant 1 is guided to, for example, the adjustment tank 301a or the neutralization tank 301b (hereinafter referred to as the treatment tank 301), and the wastewater treatment apparatus 10 has a pH value of the treatment tank 301. Wastewater treatment is performed to satisfy the wastewater standards.

排水処理装置１０は、酸供給ライン１１０ａ，１１０ｂ（以下、酸供給ライン１１０という。）と、アルカリ供給ライン１２０ａ，１２０ｂ（以下、アルカリ供給ライン１２０という。）と、酸制御部１１３ａ，１１３ｂ（以下、酸制御部１１３という。）と、アルカリ制御部１２３ａ，１２３ｂ（以下、アルカリ制御部１２３という。）とを備え、処理槽３０１のｐＨを調整する。排水処理装置１０は、ｐＨを調整するために、ｐＨを測定するｐＨ測定部１３１ａ，１３１ｂ（以下、ｐＨ測定部１３１という。）をさらに備える。   The wastewater treatment apparatus 10 includes an acid supply line 110a, 110b (hereinafter referred to as an acid supply line 110), an alkali supply line 120a, 120b (hereinafter referred to as an alkali supply line 120), and an acid control unit 113a, 113b (hereinafter, referred to as an acid supply line 110). And acid control unit 113) and alkali control units 123a and 123b (hereinafter referred to as alkali control unit 123), and adjusts the pH of the treatment tank 301. The wastewater treatment apparatus 10 further includes pH measuring units 131a and 131b (hereinafter referred to as pH measuring units 131) that measure the pH in order to adjust the pH.

酸供給ライン１１０は、処理槽３０１に酸性の液体（例えば、塩酸）を供給する。酸供給ライン１１０には、第１調整弁１１１ａ，１１１ｂ（以下、第１調整弁１１１という。）と、第１調整弁１１１の上流側に第１開閉弁１１２ａ，１１２ｂ（以下、第１開閉弁１１２という。）とが設けられている。アルカリ供給ライン１２０は、処理槽３０１にアルカリ性の液体（例えば、苛性ソーダ）を供給する。アルカリ供給ライン１２０には、第２調整弁１２１ａ，１２１ｂ（以下、第２調整弁１２１という。）と、第２調整弁１２１の上流側に第２開閉弁１２２ａ，１２２ｂ（以下、第２開閉弁１２２という。）とが設けられている。   The acid supply line 110 supplies an acidic liquid (for example, hydrochloric acid) to the treatment tank 301. The acid supply line 110 includes first adjustment valves 111a and 111b (hereinafter referred to as first adjustment valves 111), and first on-off valves 112a and 112b (hereinafter referred to as first on-off valves) on the upstream side of the first adjustment valve 111. 112)). The alkali supply line 120 supplies an alkaline liquid (for example, caustic soda) to the treatment tank 301. The alkali supply line 120 includes second adjustment valves 121a and 121b (hereinafter referred to as second adjustment valve 121), and second on-off valves 122a and 122b (hereinafter referred to as second on-off valves) on the upstream side of the second adjustment valve 121. 122).

酸制御部１１３は、ｐＨ測定部１３１により測定されたｐＨに基づいて、酸供給ライン１１０に設けられた第１調整弁１１１の開度を決定する。具体的には、酸制御部１１３は、測定されたｐＨ値（例えば、ｐＨ計によって測定された測定ｐＨ値）と、目標のｐＨ値（例えば、基準値として設定されている設定ｐＨ値）との差からＰＩＤ制御をするための制御量を算出し、算出した制御量に基づいて、第１調整弁１１１の開度を決定する。   The acid control unit 113 determines the opening degree of the first adjustment valve 111 provided in the acid supply line 110 based on the pH measured by the pH measurement unit 131. Specifically, the acid control unit 113 includes a measured pH value (for example, a measured pH value measured by a pH meter), a target pH value (for example, a set pH value set as a reference value), and A control amount for performing PID control is calculated from the difference between them, and the opening of the first regulating valve 111 is determined based on the calculated control amount.

次に、酸制御部１１３は、第１調整弁１１１の開度に基づいて第１開閉弁１１２を開閉させる。具体的には、酸制御部１１３は、第１調整弁１１１の開度が所定の値未満である場合に第１調整弁１１１の状態を閉止状態と判断し、第１開閉弁１１２を閉止する。酸制御部１１３は、第１調整弁１１１の開度が所定の値以上である場合に第１開閉弁１１２を開く。排水処理装置１０は、第１開閉弁１１２を閉止することによって、第１調整弁１１１のみで酸供給ライン１１０を閉止した場合のシートリークを防止する。   Next, the acid control unit 113 opens and closes the first on-off valve 112 based on the opening degree of the first adjustment valve 111. Specifically, the acid control unit 113 determines that the state of the first adjustment valve 111 is closed when the opening of the first adjustment valve 111 is less than a predetermined value, and closes the first on-off valve 112. . The acid control unit 113 opens the first on-off valve 112 when the opening degree of the first adjustment valve 111 is equal to or greater than a predetermined value. The waste water treatment apparatus 10 prevents the seat leak when the acid supply line 110 is closed only by the first regulating valve 111 by closing the first on-off valve 112.

同様に、アルカリ制御部１２３は、ｐＨ測定部１３１により測定されたｐＨに基づいて、アルカリ供給ライン１２０に設けられた第２調整弁１２１の開度を決定する。具体的には、アルカリ制御部１２３は、ｐＨ計によって測定された測定ｐＨ値と、目標の設定ｐＨ値との差からＰＩＤ制御をするための制御量を算出し、算出した制御量に基づいて、第２調整弁１２１の開度を決定する。   Similarly, the alkali control unit 123 determines the opening degree of the second adjustment valve 121 provided in the alkali supply line 120 based on the pH measured by the pH measurement unit 131. Specifically, the alkali control unit 123 calculates a control amount for performing PID control from the difference between the measured pH value measured by the pH meter and the target set pH value, and based on the calculated control amount. The opening degree of the second adjustment valve 121 is determined.

次に、アルカリ制御部１２３は、第２調整弁１２１の開度に基づいて第２開閉弁１２２を開閉させる。具体的には、アルカリ制御部１２３は、第２調整弁１２１の開度が所定の値未満である場合に第２調整弁１２１の状態を閉止状態と判断し、第２開閉弁１２２を閉止する。アルカリ制御部１２３は、第２調整弁１２１の開度が所定の値以上である場合に第２開閉弁１２２を開く。排水処理装置１０は、第２開閉弁１２２を閉止することによって、第２調整弁１２１のみでアルカリ供給ライン１２０を閉止した場合のシートリークを防止する。   Next, the alkali control unit 123 opens and closes the second on-off valve 122 based on the opening degree of the second adjustment valve 121. Specifically, the alkali control unit 123 determines that the state of the second adjustment valve 121 is closed when the opening of the second adjustment valve 121 is less than a predetermined value, and closes the second opening / closing valve 122. . The alkali control unit 123 opens the second on-off valve 122 when the opening degree of the second adjustment valve 121 is equal to or greater than a predetermined value. The waste water treatment apparatus 10 prevents the seat leak when the alkali supply line 120 is closed only by the second adjustment valve 121 by closing the second on-off valve 122.

排水処理装置１０は、酸供給ライン１１０とアルカリ供給ライン１２０とのそれぞれのラインで、調整弁１１１，１２１の開度に基づいて開閉弁１１２，１２２を開閉させ、測定したｐＨ値と設定ｐＨ値とから調整弁１１１，１２１の開度のＰＩＤ制御をそれぞれ行い、追従性を向上させる。   The waste water treatment apparatus 10 opens and closes the on-off valves 112 and 122 based on the opening degree of the regulating valves 111 and 121 in each of the acid supply line 110 and the alkali supply line 120, and the measured pH value and the set pH value. From the above, PID control of the opening degree of the regulating valves 111 and 121 is performed to improve the followability.

図２は、本発明の一実施形態に係る排水処理装置１０の処理内容を示すフローチャートである。排水処理装置１０は、コンピュータ及びその周辺装置が備えるハードウェア並びに該ハードウェアを制御するソフトウェアによって構成され、以下の処理は、排水処理装置１０の制御部（例えば、ＣＰＵ）が所定のソフトウェアに従い実行する処理である。   FIG. 2 is a flowchart showing the processing contents of the waste water treatment apparatus 10 according to one embodiment of the present invention. The wastewater treatment apparatus 10 is configured by hardware included in a computer and its peripheral devices and software that controls the hardware. The following processing is executed by a control unit (for example, CPU) of the wastewater treatment apparatus 10 according to predetermined software. It is processing to do.

ステップＳ１１において、排水処理装置１０（ｐＨ測定部１３１）は、ｐＨを測定する。より具体的には、排水処理装置１０は、ｐＨ計により測定したｐＨ値を受信する。その後、排水処理装置１０は、処理をステップＳ１２に移す。   In step S11, the waste water treatment apparatus 10 (pH measurement unit 131) measures pH. More specifically, the waste water treatment apparatus 10 receives a pH value measured by a pH meter. Thereafter, the waste water treatment apparatus 10 moves the process to step S12.

ステップＳ１２において、排水処理装置１０（酸制御部１１３、アルカリ制御部１２３）は、測定したｐＨが所定の範囲内か否かを判断する。より具体的には、排水処理装置１０は、ｐＨ計から受信したｐＨ値が所定の範囲内の値か否かを判断する。この判断がＹＥＳの場合、排水処理装置１０は、処理をステップＳ１１に移し、ＮＯの場合、排水処理装置１０は、処理をステップＳ１３に移す。   In step S12, the waste water treatment apparatus 10 (the acid control unit 113, the alkali control unit 123) determines whether or not the measured pH is within a predetermined range. More specifically, the waste water treatment apparatus 10 determines whether or not the pH value received from the pH meter is within a predetermined range. If this determination is YES, the wastewater treatment apparatus 10 moves the process to step S11, and if NO, the wastewater treatment apparatus 10 moves the process to step S13.

ステップＳ１３において、排水処理装置１０（酸制御部１１３、アルカリ制御部１２３）は、酸供給ライン１１０の第１調整弁１１１と、アルカリ供給ライン１２０の第２調整弁１２１との開度を決定する。より具体的には、排水処理装置１０は、ステップＳ１１で測定された測定ｐＨ値と、目標の設定ｐＨ値との差からＰＩＤ制御をするための制御量を算出し、算出した制御量に基づいて、第１調整弁１１１と第２調整弁１２１との開度を決定する。その後、排水処理装置１０は、処理をステップＳ１４に移す。   In step S <b> 13, the waste water treatment apparatus 10 (the acid control unit 113 and the alkali control unit 123) determines the opening degrees of the first adjustment valve 111 of the acid supply line 110 and the second adjustment valve 121 of the alkali supply line 120. . More specifically, the waste water treatment apparatus 10 calculates a control amount for performing PID control from the difference between the measured pH value measured in step S11 and the target set pH value, and based on the calculated control amount. Thus, the opening degrees of the first adjustment valve 111 and the second adjustment valve 121 are determined. Thereafter, the waste water treatment apparatus 10 moves the process to step S14.

ステップＳ１４において、排水処理装置１０（酸制御部１１３）は、第１調整弁１１１の開度が所定以上か否かを判断する。より具体的には、排水処理装置１０は、第１調整弁１１１の開度が開を示す所定の値以上か否かを判断する。この判断がＹＥＳの場合、排水処理装置１０は、処理をステップＳ１５に移し、ＮＯの場合、排水処理装置１０は、処理をステップＳ１６に移す。   In step S14, the waste water treatment apparatus 10 (acid control unit 113) determines whether or not the opening degree of the first adjustment valve 111 is equal to or greater than a predetermined value. More specifically, the waste water treatment apparatus 10 determines whether or not the opening degree of the first adjustment valve 111 is equal to or greater than a predetermined value indicating opening. If this determination is YES, the wastewater treatment apparatus 10 moves the process to step S15, and if NO, the wastewater treatment apparatus 10 moves the process to step S16.

ステップＳ１５において、排水処理装置１０（酸制御部１１３）は、酸供給ライン１１０の第１開閉弁１１２を開く。その後、排水処理装置１０は、処理をステップＳ１７に移す。   In step S <b> 15, the wastewater treatment apparatus 10 (acid control unit 113) opens the first on-off valve 112 of the acid supply line 110. Thereafter, the waste water treatment apparatus 10 moves the process to step S17.

ステップＳ１６において、排水処理装置１０（酸制御部１１３）は、酸供給ライン１１０の第１開閉弁１１２を閉じる。その後、排水処理装置１０は、処理をステップＳ１７に移す。   In step S <b> 16, the waste water treatment apparatus 10 (acid control unit 113) closes the first on-off valve 112 of the acid supply line 110. Thereafter, the waste water treatment apparatus 10 moves the process to step S17.

ステップＳ１７において、排水処理装置１０（アルカリ制御部１２３）は、第２調整弁１２１の開度が所定以上か否かを判断する。より具体的には、排水処理装置１０は、第２調整弁１２１の開度が開を示す所定の値以上か否かを判断する。この判断がＹＥＳの場合、排水処理装置１０は、処理をステップＳ１８に移し、ＮＯの場合、排水処理装置１０は、処理をステップＳ１９に移す。   In step S <b> 17, the wastewater treatment apparatus 10 (alkali control unit 123) determines whether the opening degree of the second adjustment valve 121 is equal to or greater than a predetermined value. More specifically, the waste water treatment apparatus 10 determines whether or not the opening degree of the second adjustment valve 121 is equal to or greater than a predetermined value indicating opening. If this determination is YES, the wastewater treatment apparatus 10 moves the process to step S18, and if NO, the wastewater treatment apparatus 10 moves the process to step S19.

ステップＳ１８において、排水処理装置１０（アルカリ制御部１２３）は、アルカリ供給ライン１２０の第２開閉弁１２２を開く。その後、排水処理装置１０は、処理をステップＳ１１に移す。   In step S <b> 18, the waste water treatment apparatus 10 (alkali control unit 123) opens the second on-off valve 122 of the alkali supply line 120. Thereafter, the waste water treatment apparatus 10 moves the process to step S11.

ステップＳ１９において、排水処理装置１０（アルカリ制御部１２３）は、アルカリ供給ライン１２０の第２開閉弁１２２を閉じる。その後、排水処理装置１０は、処理をステップＳ１１に移す。   In step S <b> 19, the wastewater treatment apparatus 10 (alkali control unit 123) closes the second on-off valve 122 of the alkali supply line 120. Thereafter, the waste water treatment apparatus 10 moves the process to step S11.

本実施形態によれば、排水処理装置１０は、酸供給ライン１１０に設けられる第１調整弁１１１の上流側に第１開閉弁１１２を設け、第１調整弁１１１の開度に基づいて第１開閉弁１１２を開閉させ、アルカリ供給ライン１２０に設けられる第２調整弁１２１の上流側に第２開閉弁１２２を設け、第２調整弁１２１の開度に基づいて第２開閉弁１２２を開閉させる。したがって、排水処理装置１０は、調整弁１１１，１２１の開度に基づいて、調整弁１１１，１２１の上流側に設けた開閉弁１１２，１２２を開閉させるので、調整弁１１１，１２１の負担を軽減させ、調整弁１１１，１２１のシートリークによるｐＨ調整制御への外乱を防止することができる。   According to this embodiment, the waste water treatment apparatus 10 is provided with the first on-off valve 112 on the upstream side of the first adjustment valve 111 provided in the acid supply line 110, and the first on the basis of the opening degree of the first adjustment valve 111. The on-off valve 112 is opened and closed, a second on-off valve 122 is provided upstream of the second adjustment valve 121 provided in the alkali supply line 120, and the second on-off valve 122 is opened and closed based on the opening degree of the second adjustment valve 121. . Therefore, since the waste water treatment apparatus 10 opens and closes the on-off valves 112 and 122 provided on the upstream side of the regulating valves 111 and 121 based on the opening degree of the regulating valves 111 and 121, the burden on the regulating valves 111 and 121 is reduced. Thus, disturbance to the pH adjustment control due to the seat leak of the adjustment valves 111 and 121 can be prevented.

本実施形態によれば、排水処理装置１０は、ｐＨを測定するｐＨ測定部１３１をさらに備え、ｐＨ測定部１３１により測定されたｐＨに基づいて第１調整弁１１１の開度を決定し、ｐＨ測定部１３１により測定されたｐＨに基づいて第２調整弁１２１の開度を決定する。したがって、排水処理装置１０は、測定したｐＨに基づいて調整弁１１１，１２１の開度を決定するので、調整弁１１１，１２１のシートリークによるｐＨ調整制御への外乱が開閉弁１１２，１２２によって防止されている状態で、処理槽３０１のｐＨ調整制御の追従性をさらに向上させることができる。   According to the present embodiment, the waste water treatment apparatus 10 further includes a pH measurement unit 131 that measures pH, determines the opening of the first adjustment valve 111 based on the pH measured by the pH measurement unit 131, and pH The opening degree of the second adjustment valve 121 is determined based on the pH measured by the measurement unit 131. Therefore, since the waste water treatment apparatus 10 determines the opening degree of the regulating valves 111 and 121 based on the measured pH, the on / off valves 112 and 122 prevent disturbance to the pH regulation control due to the seat leak of the regulating valves 111 and 121. In this state, the followability of the pH adjustment control of the treatment tank 301 can be further improved.

以上、本発明の実施形態について説明したが、本発明は上述した実施形態に限るものではない。また、本発明の実施形態に記載された効果は、本発明から生じる最も好適な効果を列挙したに過ぎず、本発明による効果は、本発明の実施形態に記載されたものに限定されるものではない。   As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

１ 発電プラント
１０ 排水処理装置
１１０ａ，１１０ｂ 酸供給ライン
１１１ａ，１１１ｂ 第１調整弁
１１２ａ，１１２ｂ 第１開閉弁
１１３ａ，１１３ｂ 酸制御部
１２０ａ，１２０ｂ アルカリ供給ライン
１２１ａ，１２１ｂ 第２調整弁
１２２ａ，１２２ｂ 第２開閉弁
１２３ａ，１２３ｂ アルカリ制御部
１３１ａ，１３１ｂ ｐＨ測定部
３０１ａ 調整槽
３０１ｂ 中和槽 DESCRIPTION OF SYMBOLS 1 Power plant 10 Waste water treatment apparatus 110a, 110b Acid supply line 111a, 111b 1st adjustment valve 112a, 112b 1st on-off valve 113a, 113b Acid control part 120a, 120b Alkali supply line 121a, 121b 2nd adjustment valve 122a, 122b 2nd 2 On-off valve 123a, 123b Alkali control part 131a, 131b pH measurement part 301a Adjustment tank 301b Neutralization tank

Claims (3)

処理槽のｐＨを調整する排水処理装置であって、
前記処理槽に酸性の液体を供給する酸供給ラインと、
前記処理槽にアルカリ性の液体を供給するアルカリ供給ラインと、
前記酸供給ラインに設けられる第１調整弁と、
前記アルカリ供給ラインに設けられる第２調整弁と、
前記第１調整弁の上流側に設けられる第１開閉弁と、
前記第２調整弁の上流側に設けられる第２開閉弁と、
前記第１調整弁の開度に基づいて前記第１開閉弁を開閉させる酸制御部と、
前記第２調整弁の開度に基づいて前記第２開閉弁を開閉させるアルカリ制御部と、
を備える排水処理装置。 A wastewater treatment device for adjusting the pH of the treatment tank,
An acid supply line for supplying an acidic liquid to the treatment tank;
An alkali supply line for supplying an alkaline liquid to the treatment tank;
A first regulating valve provided in the acid supply line;
A second regulating valve provided in the alkali supply line;
A first on-off valve provided upstream of the first regulating valve;
A second on-off valve provided on the upstream side of the second regulating valve;
An acid control unit for opening and closing the first on-off valve based on an opening of the first adjustment valve;
An alkali control unit for opening and closing the second on-off valve based on an opening of the second adjustment valve;
A wastewater treatment device comprising: ｐＨを測定するｐＨ測定部をさらに備え、
前記酸制御部は、前記ｐＨ測定部により測定されたｐＨに基づいて前記第１調整弁の開度を決定し、
前記アルカリ制御部は、前記ｐＨ測定部により測定されたｐＨに基づいて前記第２調整弁の開度を決定する、
請求項１に記載の排水処理装置。 a pH measurement unit for measuring pH;
The acid control unit determines the opening of the first adjustment valve based on the pH measured by the pH measurement unit,
The alkali control unit determines the opening of the second adjustment valve based on the pH measured by the pH measurement unit.
The wastewater treatment apparatus according to claim 1. 請求項１に記載の排水処理装置が実行する方法であって、
前記酸制御部が、前記第１調整弁の開度に基づいて前記第１開閉弁を開閉させるステップと、
前記アルカリ制御部が、前記第２調整弁の開度に基づいて前記第２開閉弁を開閉させるステップと、
を備える方法。 A method performed by the wastewater treatment apparatus according to claim 1,
The acid control unit opening and closing the first on-off valve based on an opening of the first adjustment valve;
The alkali control unit opening and closing the second on-off valve based on an opening of the second adjustment valve;
A method comprising:
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