JP7220863B2 - pH neutralization treatment device and pH neutralization treatment method - Google Patents

pH neutralization treatment device and pH neutralization treatment method Download PDF

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JP7220863B2
JP7220863B2 JP2018092331A JP2018092331A JP7220863B2 JP 7220863 B2 JP7220863 B2 JP 7220863B2 JP 2018092331 A JP2018092331 A JP 2018092331A JP 2018092331 A JP2018092331 A JP 2018092331A JP 7220863 B2 JP7220863 B2 JP 7220863B2
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JP2019195794A (en
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佳央 樋本
浩嗣 伊達
裕介 坂
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近畿基礎工事株式会社
株式会社エイエスイー
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本発明は、ｐＨ中和処理装置およびｐＨ中和処理方法に関する。 The present invention relates to a pH neutralization apparatus and a pH neutralization method.

高濃度の酸またはアルカリ（塩基）の排水をｐＨ中和処理、たとえば、建設現場などにおける高濃度アルカリ排水のｐＨ中和処理においては、排水の原水のｐＨおよび流量が大きく変動し、また、排水の原水中に含まれるコンクリート粒子からのアルカリ分の溶出があるため、従来のｐＨ中和処理におけるｐＨ調整は、１段階で行うことが困難であることから、以下の２段階で行われている。すなわち、第１段階において硫酸などを用いてｐＨを１１程度に調整し、第２段階において炭酸ガスを用いてｐＨを５．８～８．６（河川に放流する場合）または５．０～９．０（下水に放流する場合）の中性領域に調整している。このため、従来のｐＨ中和処理においては、ｐＨ中和処理後の放流水のｐＨ変動を抑制確実なｐＨ中和を行うのに、大型の処理装置が必要である。 In the pH neutralization treatment of highly concentrated acid or alkali (base) wastewater, for example, in the pH neutralization treatment of highly concentrated alkaline wastewater at construction sites, etc., the pH and flow rate of the raw wastewater fluctuate greatly, and the wastewater Due to the elution of alkali content from the concrete particles contained in the raw water, it is difficult to adjust the pH in one step in the conventional pH neutralization treatment, so it is performed in the following two steps. . That is, in the first stage, the pH is adjusted to about 11 using sulfuric acid or the like, and in the second stage, carbon dioxide gas is used to adjust the pH to 5.8 to 8.6 (when discharged into a river) or 5.0 to 9. It is adjusted to the neutral region of 0.0 (when discharged to sewage). For this reason, in the conventional pH neutralization treatment, a large-sized treatment apparatus is required in order to suppress the pH fluctuation of the discharged water after the pH neutralization treatment and to carry out reliable pH neutralization.

特開２００８－１９４６５７号公報（特許文献１）は、小さな水槽で短時間に高アルカリ排水を効率よく中和することを目的として、下部で連通するように仕切壁で仕切られ、第１・第２処理水槽となる高アルカリ処理用水槽と、高アルカリ処理用水槽の第１処理水槽に高アルカリ排水を供給する高アルカリ排水供給装置と、高アルカリ処理用水槽の第２処理水槽から第１処理水槽への高アルカリ排水を循環させる高アルカリ排水循環通路と、高アルカリ排水循環通路に介装された高アルカリ排水に塩酸や硫酸を混合して第１の中和をする第１のラインミキサーと、高アルカリ処理用水槽の第２処理水槽と上部で連通し、下部で連通するように仕切壁で仕切られ、第１・第２処理水槽となる炭酸ガス処理用水槽と、炭酸ガス処理用水槽の第２処理水槽から第１処理水槽へ炭酸ガス処理を行う第１の中和処理された排水を循環させる炭酸ガス処理排水循環通路と、炭酸ガス処理排水循環通路に介装された第１の中和処理された排水に炭酸ガスを混合して中和を完了させる第２のラインミキサーと、炭酸ガス処理用水槽の第２処理水槽より外部へ処理された排水を排出する排出装置とからなるｐＨ中和処理装置を開示する。 Japanese Patent Application Laid-Open No. 2008-194657 (Patent Document 1) discloses that a partition wall communicates with a lower portion for the purpose of efficiently neutralizing highly alkaline waste water in a small water tank, and the first and second A high-alkaline treatment water tank serving as 2 treatment water tanks, a high-alkaline wastewater supply device for supplying high-alkaline wastewater to the first treatment water tank of the high-alkali treatment water tank, and the first treatment from the second treatment water tank of the high-alkali treatment water tank A highly alkaline waste water circulation passage for circulating highly alkaline waste water to the water tank, and a first line mixer for mixing hydrochloric acid or sulfuric acid with the highly alkaline waste water interposed in the highly alkaline waste water circulation passage for first neutralization. , a carbon dioxide treatment water tank, which is divided by a partition wall so as to communicate with the second treatment water tank of the high alkali treatment water tank at the upper part and communicate with the lower part, and becomes the first and second treatment water tanks, and a carbon dioxide treatment water tank A carbon dioxide treated waste water circulation passage for circulating the first neutralized waste water for carbonation from the second treated water tank to the first treated water tank, and a first carbon dioxide treated waste water circulation passage interposed in the It consists of a second line mixer for mixing neutralized waste water with carbon dioxide to complete the neutralization, and a discharge device for discharging the treated waste water from the second water tank of the water tank for carbon dioxide treatment to the outside. A pH neutralization processor is disclosed.

特開２００８－１９４６５７号公報JP 2008-194657 A

特開２００８－１９４６５７号公報（特許文献１）に開示のｐＨ中和処理装置は、ｐＨ中和処理のための水槽の構造を工夫することにより水槽の小型化を図ることを目的とするが、ｐＨ中和処理に際して強酸である塩酸や硫酸と過剰に剤投入をしても問題の少ない弱酸である炭酸ガスとの２種類のｐＨ中和剤を用いること、および、強酸を用いる高アルカリ処理用水槽と弱酸を用いる炭酸ガス処理用水槽と（すなわち２つの水槽）を含むことから、ｐＨ中和処理時間の短縮化が難しいため、ｐＨ処理装置の小型化が難しいという問題点がある。 The pH neutralization treatment apparatus disclosed in Japanese Patent Application Laid-Open No. 2008-194657 (Patent Document 1) aims to reduce the size of the water tank by devising the structure of the water tank for the pH neutralization treatment. To use two types of pH neutralizing agents, hydrochloric acid and sulfuric acid, which are strong acids, and carbon dioxide gas, which is a weak acid which poses little problem even if the agent is excessively added, in the pH neutralization treatment, and for high alkali treatment using a strong acid. Since it includes a water tank and a water tank for carbon dioxide gas treatment using a weak acid (that is, two water tanks), it is difficult to shorten the pH neutralization treatment time.

そこで、上記の問題点を解決するため、小型の装置で確実なｐＨ中和処理が可能なｐＨ中和処理装置およびｐＨ中和処理方法を提供することを目的とする。 Therefore, in order to solve the above problems, it is an object of the present invention to provide a pH neutralization apparatus and a pH neutralization method capable of reliably performing pH neutralization with a small apparatus.

本発明のある態様にかかるｐＨ中和処理装置は、ｐＨ中和剤を収容するためのｐＨ中和剤槽と、原水をｐＨ中和処理するとともにそれにより得られるｐＨ中和処理水を収容するためのｐＨ中和処理水槽と、原水をｐＨ中和処理水槽に供給する原水供給通路と、ｐＨ中和剤槽からｐＨ中和剤を供給するｐＨ中和剤供給通路と、ｐＨ中和剤供給通路から供給されたｐＨ中和剤をｐＨ中和処理水槽から取り出したｐＨ中和処理水と混合することにより希釈してｐＨ中和処理水槽に供給するｐＨ中和剤希釈通路と、原水のｐＨおよび流量から原水のｐＨ中和処理に必要なｐＨ中和剤の流量を演算してｐＨ中和処理水槽に供給する１次機構ならびにｐＨ中和処理水のｐＨおよび水量に基づいてｐＨ中和処理水のさらなるｐＨ中和処理に必要なｐＨ中和剤の流量を演算してｐＨ中和処理水槽に供給する２次機構を有するｐＨ中和剤供給制御装置と、を備え、ｐＨ中和剤供給通路はｐＨ中和剤希釈通路に接続している。本態様のｐＨ中和処理装置は、上記１次機構および２次機構を有するｐＨ中和剤供給制御装置を備え、ｐＨ中和剤供給通路がｐＨ中和剤希釈通路に接続していることから、ｐＨ中和剤供給通路から供給されたｐＨ中和剤がｐＨ中和剤希釈通路においてｐＨ中和処理水槽から取り出したｐＨ中和処理水と混合されることにより希釈されてｐＨ中和処理水槽に供給されるため、小型の装置で確実なｐＨ中和処理が可能である。 A pH neutralization apparatus according to an aspect of the present invention includes a pH neutralizer tank for containing a pH neutralizer, and a pH neutralizer for raw water and a pH neutralized water obtained thereby. a pH neutralization treatment tank for pH neutralization, a raw water supply passage for supplying raw water to the pH neutralization treatment tank, a pH neutralizer supply passage for supplying the pH neutralizer from the pH neutralizer tank, and a pH neutralizer supply a pH neutralizer dilution passage for mixing the pH neutralizer supplied from the passage with the pH neutralized water taken out from the pH neutralized water tank and supplying the pH neutralized water to the pH neutralized water tank; and the primary mechanism for calculating the flow rate of the pH neutralizing agent required for pH neutralization of the raw water from the flow rate and supplying it to the pH neutralization treatment tank, and the pH neutralization treatment based on the pH and the amount of the pH neutralized water a pH neutralizer supply control device having a secondary mechanism for calculating the flow rate of the pH neutralizer necessary for further pH neutralization of water and supplying the pH neutralizer to the pH neutralization water tank, wherein the pH neutralizer is supplied. The passageway connects to the pH neutralizer dilution passageway. Since the pH neutralization treatment apparatus of this aspect includes the pH neutralizer supply control apparatus having the primary mechanism and the secondary mechanism, and the pH neutralizer supply passage is connected to the pH neutralizer dilution passage, , the pH neutralizer supplied from the pH neutralizer supply passage is mixed with the pH neutralized water taken out from the pH neutralized water tank in the pH neutralizer diluting passage to be diluted into the pH neutralized water tank. Since it is supplied to , reliable pH neutralization treatment is possible with a small-sized device.

本態様のｐＨ中和処理装置において、ｐＨ中和剤供給制御装置は、ｐＨ中和剤の最大の流量に対して０．００１倍以下の流量の割合で段階的に流量制御ができる。かかるｐＨ中和処理装置は、ｐＨ中和剤の精密な流量制御ができるため、小型の装置でより確実なｐＨ中和処理が可能である。 In the pH neutralization treatment apparatus of this aspect, the pH neutralizer supply controller can stepwise control the flow rate at a rate of 0.001 times or less of the maximum flow rate of the pH neutralizer. Since such a pH neutralization apparatus can precisely control the flow rate of the pH neutralizing agent, it is possible to perform more reliable pH neutralization treatment with a small apparatus.

本態様のｐＨ中和処理装置において、原水を収容するための原水槽と、ｐＨ中和処理水槽から流出するｐＨ中和処理水を放流水として収容するための放流水槽と、をさらに備えることができる。かかるｐＨ中和処理装置は、上記原水槽、放流水槽および放流水還流通路を備えているため、小型の装置でより確実なｐＨ中和処理が可能である。 The pH neutralization apparatus of this aspect may further include a raw water tank for containing raw water, and a discharge water tank for containing the pH neutralized water flowing out of the pH neutralization treatment tank as discharged water. can. Since such a pH neutralization apparatus includes the raw water tank, the effluent water tank, and the effluent reflux passage, it is possible to carry out more reliable pH neutralization treatment with a small apparatus.

本発明の別の態様にかかるｐＨ中和処理方法は、上記態様のｐＨ中和処理装置を用いる原水のｐＨ中和処理方法であって、ｐＨ中和剤をｐＨ中和剤供給通路およびｐＨ中和剤希釈通路を通じてｐＨ中和処理水槽に供給する際に、ｐＨ中和剤供給制御装置を用いて、原水のｐＨおよび流量から原水のｐＨ中和処理に必要なｐＨ中和剤の流量を演算してｐＨ中和処理水槽に供給することにより原水のｐＨ中和処理を行う１次ｐＨ中和処理工程と、ｐＨ中和剤供給制御装置を用いて、ｐＨ中和処理水のｐＨおよび水量に基づいてｐＨ中和処理水のさらなるｐＨ中和処理に必要なｐＨ中和剤の流量を演算してｐＨ中和処理水槽に供給することによりｐＨ中和処理水のさらなるｐＨ中和処理を行う２次ｐＨ中和処理工程と、を備える。本態様のｐＨ中和処理方法は、ｐＨ中和剤をｐＨ中和剤供給通路およびｐＨ中和剤希釈通路を通じてｐＨ中和処理水槽に供給する際に、上記１次ｐＨ中和処理工程および２次ｐＨ中和処理工程を備えるため、小型のｐＨ中和処理装置を用いて確実なｐＨ中和処理が可能である。 A pH neutralization method according to another aspect of the present invention is a method for pH neutralization of raw water using the pH neutralization apparatus of the above aspect, wherein a pH neutralizer is added to the pH neutralizer supply passage and the pH. When supplying the pH neutralizing agent to the pH neutralizing treatment tank through the solubilizer dilution passage, the pH neutralizing agent supply controller is used to calculate the flow rate of the pH neutralizing agent required for the pH neutralizing treatment of the raw water from the pH and flow rate of the raw water. A primary pH neutralization process for neutralizing the pH of the raw water by supplying it to the pH neutralization treatment tank, and a pH neutralizing agent supply control device are used to adjust the pH and the amount of the pH neutralization treatment water. Based on the above, the flow rate of the pH neutralizing agent required for further pH neutralization of the pH-neutralized water is calculated, and the pH-neutralized water is further neutralized by supplying it to the pH-neutralized water tank 2. and a subsequent pH neutralization treatment step. In the pH neutralization treatment method of this embodiment, when the pH neutralizer is supplied to the pH neutralization treatment water tank through the pH neutralization agent supply passage and the pH neutralization agent dilution passage, the primary pH neutralization treatment step and 2 Since the subsequent pH neutralization treatment step is provided, reliable pH neutralization treatment is possible using a small-sized pH neutralization treatment apparatus.

上記によれば、小型の装置で確実なｐＨ中和処理が可能なｐＨ中和処理装置およびｐＨ中和処理方法を提供することができる。 According to the above, it is possible to provide a pH neutralization apparatus and a pH neutralization method capable of reliably performing pH neutralization with a small apparatus.

図１は、本発明のある態様にかかるｐＨ中和処理装置の一例を示す概略説明図である。FIG. 1 is a schematic explanatory diagram showing an example of a pH neutralization apparatus according to one aspect of the present invention. 図２は、本発明のある態様にかかるｐＨ中和処理装置を用いたｐＨ中和処理における原水、ｐＨ中和処理水および放流水のｐＨの変動の一例を示すグラフである。FIG. 2 is a graph showing an example of pH fluctuations of raw water, pH-neutralized water, and effluent water in pH neutralization using the pH neutralization apparatus according to an embodiment of the present invention. 図３は、本発明のある態様にかかるｐＨ中和処理装置を用いたｐＨ中和処理における原水および放流水の流量の変動の一例を示すグラフである。FIG. 3 is a graph showing an example of fluctuations in the flow rates of raw water and effluent water in pH neutralization using the pH neutralization apparatus according to one aspect of the present invention.

＜実施形態１：ｐＨ中和処理装置＞
図１を参照して、本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤２０Ｗを収容するためのｐＨ中和剤槽２０と、原水１０ＷをｐＨ中和処理するとともにそれにより得られるｐＨ中和処理水３０Ｗを収容するためのｐＨ中和処理水槽３０と、原水１０ＷをｐＨ中和処理水槽３０に供給する原水供給通路１３Ｌと、ｐＨ中和剤槽２０からｐＨ中和剤２０Ｗを供給するｐＨ中和剤供給通路２３Ｌと、ｐＨ中和剤供給通路２３Ｌから供給されたｐＨ中和剤２０ＷをｐＨ中和処理水槽３０から取り出したｐＨ中和処理水３０Ｗと混合することにより希釈してｐＨ中和処理水槽３０に供給するｐＨ中和剤希釈通路３３Ｌと、原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給する１次機構ならびにｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給する２次機構を有するｐＨ中和剤供給制御装置５０と、を備え、ｐＨ中和剤供給通路２３ＬはｐＨ中和剤希釈通路３３Ｌに接続している。 <Embodiment 1: pH neutralization treatment device>
Referring to FIG. 1, a pH neutralization apparatus 1 of the present embodiment includes a pH neutralizer tank 20 for containing a pH neutralizer 20W, and a pH neutralizer for raw water 10W. A pH-neutralized water tank 30 for containing pH-neutralized water 30W, a raw water supply passage 13L for supplying raw water 10W to the pH-neutralized water tank 30, and a pH-neutralizing agent 20W from the pH-neutralizing agent tank 20. The pH neutralizer supply passage 23L to be supplied and the pH neutralizer 20W supplied from the pH neutralizer supply passage 23L are mixed with the pH neutralized water 30W taken out from the pH neutralized water tank 30 to dilute. The pH neutralizer dilution passage 33L supplied to the pH neutralization treatment tank 30 and the flow rate of the pH neutralizer 20W required for the pH neutralization treatment of the raw water 10W are calculated from the pH and flow rate of the raw water 10W. Based on the primary mechanism supplied to the treated water tank 30 and the pH and amount of the pH-neutralized water 30W, the flow rate of the pH neutralizing agent 20W required for further pH neutralization of the pH-neutralized water 30W is calculated. and a pH neutralizer supply control device 50 having a secondary mechanism for supplying the neutralization treatment water tank 30, and the pH neutralizer supply passage 23L is connected to the pH neutralizer dilution passage 33L.

本実施形態のｐＨ中和処理装置１は、上記１次機構および２次機構を有するｐＨ中和剤供給制御装置５０を備え、ｐＨ中和剤供給通路２３ＬがｐＨ中和剤希釈通路３３Ｌに接続していることから、ｐＨ中和剤供給通路から供給されたｐＨ中和剤がｐＨ中和剤希釈通路においてｐＨ中和処理水槽から取り出したｐＨ中和処理水と混合されることにより希釈されてｐＨ中和処理水槽に供給されるため、ｐＨ中和処理に要する時間（ｐＨ中和処理時間ともいう、以下同じ）が短縮されて、小型の装置で確実なｐＨ中和処理が可能である。詳しくは、以下のとおりである。 The pH neutralization treatment apparatus 1 of this embodiment includes a pH neutralizer supply controller 50 having the primary mechanism and the secondary mechanism, and the pH neutralizer supply passage 23L is connected to the pH neutralizer dilution passage 33L. Therefore, the pH neutralizer supplied from the pH neutralizer supply passage is diluted by being mixed with the pH neutralized water taken out from the pH neutralized water tank in the pH neutralizer dilution passage. Since it is supplied to the pH-neutralization treatment tank, the time required for pH-neutralization treatment (also referred to as pH-neutralization treatment time, the same shall apply hereinafter) is shortened, and reliable pH-neutralization treatment is possible with a small-sized apparatus. Details are as follows.

本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤供給制御装置５０の１次機構によって、ｐＨ中和処理水３０ＷのｐＨの測定を持つことなく、ｐＨ中和処理水槽３０への原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより、原水１０ＷのｐＨおよび水量の変動にかかわらず、迅速かつほぼ確実に原水１０ＷのｐＨ中和処理（１次ＰＨ中和処理または粗ｐＨ中和処理ともいう。以下同じ。）をすることができ、ｐＨ中和のために必要なｐＨ中和処理水槽３０内におけるｐＨ中和処理水の滞留時間を短くすることができ、ｐＨ中和処理水槽３０を小さくすることができる。ここで、原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量とは、原水のｐＨを所望の中性領域（たとえば、河川放流の場合にはｐＨが５．８以上８．６以下、下水放流の場合はｐＨが５．０以上９．０以下）とするのに必要なｐＨ中和剤２０Ｗの流量をいう。 The pH neutralization treatment apparatus 1 of the present embodiment supplies raw water to the pH neutralization treatment tank 30 without measuring the pH of the pH neutralization treatment water 30W by the primary mechanism of the pH neutralization agent supply control device 50. By calculating the flow rate of the pH neutralizing agent 20W required for pH neutralization of the raw water 10W from the pH and flow rate of 10W and supplying it to the pH neutralization treatment tank 30, regardless of the fluctuations in the pH of the raw water 10W and the amount of water , pH neutralization treatment (also referred to as primary pH neutralization treatment or crude pH neutralization treatment; hereinafter the same.) of raw water 10 W can be performed quickly and almost certainly, and pH neutralization necessary for pH neutralization The retention time of the pH-neutralized water in the treated water tank 30 can be shortened, and the size of the pH-neutralized water tank 30 can be reduced. Here, the flow rate of the pH neutralizing agent 20W required for the pH neutralization treatment of the raw water 10W means that the pH of the raw water is set to a desired neutral range (for example, in the case of river discharge, the pH is 5.8 to 8.6). Hereinafter, in the case of sewage discharge, the flow rate of the pH neutralizing agent 20W required to set the pH to 5.0 or more and 9.0 or less).

また、本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤供給制御装置５０の２次機構によって、ｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより、確実にｐＨ中和処理水３０ＷのさらなるｐＨ中和処理（２次ｐＨ中和処理または精密ｐＨ中和処理ともいう。以下同じ。）をすることができ、ｐＨ中和処理水３０Ｗの精密で確実なｐＨ中和処理ができる。ここで、ｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量とは、ｐＨ中和処理水のｐＨを所望の中性領域（たとえば、河川放流の場合にはｐＨが５．８以上８．６以下、下水放流の場合はｐＨが５．０以上９．０以下）とするのに必要なｐＨ中和剤２０Ｗの流量をいう。なお、ｐＨ中和処理水３０Ｗの水量とは、ｐＨ中和処理水槽３０内およびｐＨ中和剤希釈通路３３Ｌ内に存在するｐＨ中和処理水３０Ｗの水量をいう。 In addition, the pH neutralization treatment device 1 of the present embodiment further adjusts the pH of the pH neutralization treatment water 30W based on the pH and water volume of the pH neutralization treatment water 30W by the secondary mechanism of the pH neutralizer supply control device 50. By calculating the flow rate of the pH neutralizing agent 20W required for the neutralization treatment and supplying it to the pH neutralization treatment water tank 30, the pH neutralization treatment of the pH neutralization treatment water 30W can be reliably performed (secondary pH neutralization treatment). (Also referred to as precise pH neutralization treatment. The same shall apply hereinafter.), and precise and reliable pH neutralization treatment of 30 W of pH-neutralized water can be performed. Here, the flow rate of the pH neutralizing agent 20W required for further pH neutralization of the pH-neutralized water 30W means that the pH of the pH-neutralized water is in the desired neutral range (for example, in the case of river discharge, pH is 5.8 or more and 8.6 or less, in the case of sewage discharge, pH is 5.0 or more and 9.0 or less). The amount of pH-neutralized water 30W refers to the amount of pH-neutralized water 30W present in the pH-neutralized water tank 30 and the pH-neutralizing agent dilution passage 33L.

また、本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤供給通路２３ＬがｐＨ中和剤希釈通路３３Ｌに接続しているため、ｐＨ中和剤供給通路２３Ｌを通るｐＨ中和剤２０ＷがｐＨ中和剤希釈通路３３Ｌを通るｐＨ中和処理水３０Ｗと混合して、ｐＨ中和処理水３０Ｗ内に残存する不溶成分を溶解することができる。たとえば、ｐＨ中和剤である硫酸水溶液を用いて、原水であるコンクリート粒子を含むアルカリ水溶液のｐＨ中和処理を行う場合は、ｐＨ中和剤（硫酸水溶液）により原水（コンクリート粒子を含むアルカリ水溶液）内に残存する不溶成分（コンクリート粒子）を溶解することができる。これにより、不溶成分からの流出成分（アルカリ成分）によるｐＨ中和処理水のｐＨ変動を抑制することができ、安定した確実なｐＨ中和処理ができる。また、本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤供給通路２３ＬがｐＨ中和剤希釈通路３３Ｌに接続しているため、ｐＨ中和剤２０ＷはｐＨ中和剤希釈通路３３Ｌ内のｐＨ中和処理水によってｐＨ中和剤の濃度が希釈されて、ｐＨ中和処理水槽３０内のｐＨ中和処理水３０Ｗに供給される。このため、ｐＨ中和処理水３０ＷのｐＨ中和反応の効率が高くなりｐＨ中和処理時間が短縮されるため、ｐＨ中和処理水槽３０内のｐＨ中和処理水３０ＷのｐＨの変動が抑制され、安定した確実なｐＨ中和処理ができる。 Further, in the pH neutralization apparatus 1 of the present embodiment, the pH neutralizer supply passage 23L is connected to the pH neutralizer dilution passage 33L, so that the pH neutralizer 20W passing through the pH neutralizer supply passage 23L can mix with the pH-neutralized water 30W passing through the pH-neutralizer dilution passage 33L to dissolve the insoluble components remaining in the pH-neutralized water 30W. For example, when neutralizing the pH of an alkaline aqueous solution containing concrete particles as raw water using an aqueous sulfuric acid solution as a pH neutralizer, the pH neutralizer (aqueous sulfuric acid) is used to neutralize raw water (an alkaline aqueous solution containing concrete particles) ) can dissolve the remaining insoluble components (concrete particles). As a result, it is possible to suppress pH fluctuations in the pH-neutralized water due to outflow components (alkaline components) from the insoluble components, so that stable and reliable pH neutralization can be performed. Further, in the pH neutralization treatment apparatus 1 of the present embodiment, the pH neutralizer supply passage 23L is connected to the pH neutralizer dilution passage 33L, so that the pH neutralizer 20W is supplied to the pH neutralizer dilution passage 33L. The concentration of the pH neutralizing agent is diluted with the pH-neutralized water of , and supplied to the pH-neutralized water 30 W in the pH-neutralized water tank 30 . As a result, the efficiency of the pH neutralization reaction of the pH-neutralized water 30W is increased and the pH neutralization time is shortened, so that the fluctuation of the pH of the pH-neutralized water 30W in the pH-neutralized water tank 30 is suppressed. and stable and reliable pH neutralization treatment can be performed.

また、本実施形態のｐＨ中和処理装置１は、従来のｐＨ中和処理装置において必要とした２種類の中和剤（硫酸などの強酸と炭酸ガスなどの弱酸）を必要とせず、１種類の中和剤（硫酸などの強酸）のみを用いてｐＨ中和処理ができるため、ｐＨ中和処理水槽を従来の少なくとも２槽から１槽に削減することが可能となり、装置の小型化を図ることができる。また、弱酸である炭酸ガスなどのｐＨ中和剤を使用しないことにより処理コストを低減できる。 In addition, the pH neutralization apparatus 1 of the present embodiment does not require two types of neutralizing agents (a strong acid such as sulfuric acid and a weak acid such as carbon dioxide gas) that are required in a conventional pH neutralization apparatus. Since pH neutralization treatment can be performed using only a neutralizing agent (strong acid such as sulfuric acid), it is possible to reduce the number of pH neutralization treatment tanks from at least 2 tanks to 1 tank in the past, and to reduce the size of the equipment. be able to. In addition, treatment costs can be reduced by not using a pH neutralizing agent such as carbon dioxide, which is a weak acid.

本実施形態のｐＨ中和処理装置１において、ｐＨ中和剤供給制御装置５０は、ｐＨ中和剤２０Ｗの最大の流量に対して０．００１倍以下の流量の割合で段階的に流量制御ができることが好ましい。かかるｐＨ中和処理装置１は、ｐＨ中和剤２０Ｗの精密な流量制御ができるため、小型の装置でより精密で確実なｐＨ中和処理が可能である。詳しくは、本実施形態のｐＨ中和処理装置１は、ｐＨ中和剤供給制御装置５０がｐＨ中和剤２０Ｗの最大の流量に対して、好ましくは０．００１倍以下の流量の割合、より好ましくは０．０００１倍以下の流量の割合で段階的に流量制御することにより、小型のｐＨ中和処理水槽３０で、原水１０ＷのｐＨおよび流量ならびにｐＨ中和処理水３０ＷのｐＨの変動に対して、より精密で確実なｐＨ中和調整ができる。また、ｐＨ中和処理水３０ＷのｐＨの変動を抑制する観点から、ｐＨ中和剤２０Ｗの供給流量の脈動は、その時の供給流量に対して、２５％以下が好ましく、１０％以下がより好ましい。 In the pH neutralization treatment apparatus 1 of the present embodiment, the pH neutralizer supply controller 50 controls the flow rate stepwise at a rate of 0.001 times or less of the maximum flow rate of the pH neutralizer 20W. It is preferable to be able to Since the pH neutralization treatment device 1 can precisely control the flow rate of the pH neutralizing agent 20W, a more precise and reliable pH neutralization treatment is possible with a small-sized device. Specifically, in the pH neutralization treatment device 1 of the present embodiment, the pH neutralizer supply control device 50 preferably has a flow rate of 0.001 or less times the maximum flow rate of the pH neutralizer 20W. Preferably, by controlling the flow rate stepwise at a rate of 0.0001 times or less, in the small pH neutralization treatment water tank 30, the pH and flow rate of the raw water 10W and the pH fluctuation of the pH neutralization treatment water 30W Therefore, more precise and reliable pH neutralization adjustment is possible. In addition, from the viewpoint of suppressing fluctuations in the pH of the pH-neutralized water 30W, the pulsation of the supply flow rate of the pH neutralizer 20W is preferably 25% or less, more preferably 10% or less, of the supply flow rate at that time. .

本実施形態のｐＨ中和処理装置１において、原水１０Ｗを収容するための原水槽１０と、ｐＨ中和処理水槽３０から流出するｐＨ中和処理水３０Ｗを放流水４０Ｗとして収容するための放流水槽４０と、をさらに備えることができる。かかるｐＨ中和処理装置１は、上記原水槽１０および放流水槽４０をさらに備えているため、小型の装置でより確実なｐＨ中和処理が可能である。詳しくは、かかるｐＨ中和処理装置１は、原水槽１０に原水１０Ｗを少なくとも一時的に収容することにより、ｐＨ中和処理水槽３０への原水１０Ｗの流量の変動を抑制することができるため、小型のｐＨ中和処理水槽でより確実なｐＨ中和調整ができる。また、かかるｐＨ中和処理装置１は、放流水槽４０にｐＨ中和処理完了後のｐＨ中和処理水３０Ｗを放流水４０Ｗとして少なくとも一時的に収容することにより、放流水４０ＷのｐＨおよび流量の変動を抑制することができるため、小型のｐＨ中和処理装置でより安定なｐＨ中和調整ができる。 In the pH neutralization apparatus 1 of the present embodiment, there are a raw water tank 10 for containing raw water 10W and a discharge water tank for containing pH neutralized water 30W flowing out from the pH neutralization treatment tank 30 as discharged water 40W. 40 and . Since the pH neutralization treatment apparatus 1 further includes the raw water tank 10 and the discharge water tank 40, a more reliable pH neutralization treatment is possible with a small apparatus. Specifically, the pH neutralization apparatus 1 can suppress the fluctuation of the flow rate of the raw water 10W to the pH neutralization treatment tank 30 by storing the raw water 10W in the raw water tank 10 at least temporarily. More reliable pH neutralization adjustment is possible with a small pH neutralization treatment water tank. In addition, the pH neutralization treatment apparatus 1 at least temporarily stores the pH neutralized water 30W after completion of the pH neutralization treatment in the discharge water tank 40 as the discharge water 40W, so that the pH and the flow rate of the discharge water 40W can be changed. Since fluctuations can be suppressed, more stable pH neutralization adjustment can be performed with a small-sized pH neutralization treatment apparatus.

本実施形態のｐＨ中和処理装置１において、上記の原水槽１０および放流水槽４０に加えて、さらに放流水４０Ｗを放流水槽４０から取り出して原水槽１０に戻す放流水還流通路４１Ｌと、をさらに備えることができる。かかるｐＨ中和処理装置１は、上記の原水槽１０および放流水槽４０に加えて、さらに放流水還流通路４１Ｌを備えているため、小型の装置でさらに確実なｐＨ中和処理が可能である。詳しくは、かかるｐＨ中和処理装置１は、放流水４０ＷのｐＨが放水基準の中性領域の範囲外である場合などに、放流水還流通路４１Ｌを用いて放流水４０Ｗを放流水槽４０から取り出して原水槽１０に戻すことができるため、小型のｐＨ中和処理装置でより確実なｐＨ中和調整ができる。 In addition to the raw water tank 10 and the effluent water tank 40, the pH neutralization treatment apparatus 1 of the present embodiment further includes a effluent water circulation passage 41L that takes out the effluent water 40W from the effluent water tank 40 and returns it to the raw water tank 10. be prepared. In addition to the raw water tank 10 and the effluent water tank 40, the pH neutralization treatment apparatus 1 further includes the effluent water circulation passage 41L, so that the pH neutralization treatment can be performed more reliably with a small apparatus. Specifically, the pH neutralization apparatus 1 extracts the discharged water 40W from the discharged water tank 40 using the discharged water circulation passage 41L when the pH of the discharged water 40W is out of the range of the neutral range of the water discharge standard. Since the raw water can be returned to the raw water tank 10 by washing, more reliable pH neutralization adjustment can be performed with a small-sized pH neutralization treatment apparatus.

図１を参照して、本実施形態のｐＨ中和処理装置１をより具体的に説明する。本実施形態のｐＨ中和処理装置１は、上記のようにｐＨ中和剤槽２０と、ｐＨ中和処理水槽３０と、原水供給通路１３Ｌと、ｐＨ中和剤供給通路２３Ｌと、ｐＨ中和剤希釈通路３３Ｌと、ｐＨ中和剤供給制御装置５０と、好ましくは原水槽１０と、好ましくは放流水槽４０と、好ましくは放流水還流通路４１Ｌとを備え、ｐＨ中和剤供給通路２３ＬはｐＨ中和剤希釈通路３３Ｌに接続している。 The pH neutralization apparatus 1 of this embodiment will be described more specifically with reference to FIG. The pH neutralization treatment apparatus 1 of this embodiment includes the pH neutralizer tank 20, the pH neutralization treatment tank 30, the raw water supply passage 13L, the pH neutralizer supply passage 23L, and the pH neutralization treatment tank 30 as described above. a pH neutralizer supply control device 50; preferably a raw water tank 10; preferably a discharge water tank 40; It is connected to the neutralizer dilution passage 33L.

（原水槽）
原水槽１０は、原水１０Ｗを収容する。原水槽１０は、原水１０ＷのｐＨを測定するための原水ｐＨ計１０ｐｈ、原水１０Ｗの量を検知するための原水レベルスイッチ１０ｃ、ならびに原水１０Ｗを原水供給通路１３Ｌを経由してｐＨ中和処理水槽３０に供給するための原水供給ポンプ１３ｐを備えることが好適である。 (Raw water tank)
The raw water tank 10 contains raw water 10W. The raw water tank 10 includes a raw water pH meter 10ph for measuring the pH of the raw water 10W, a raw water level switch 10c for detecting the amount of the raw water 10W, and a pH neutralization treatment tank for the raw water 10W via the raw water supply passage 13L. Preferably, a raw water supply pump 13p is provided to supply 30.

（ｐＨ中和剤槽）
ｐＨ中和剤槽２０は、ｐＨ中和剤２０Ｗを収容する。ｐＨ中和剤槽２０は、ｐＨ中和剤２０Ｗの量を検出するためのｐＨ中和剤レベルスイッチ２０ｃ、ならびにｐＨ中和剤２０ＷをｐＨ中和剤供給通路２３ＬおよびｐＨ中和剤希釈通路３３Ｌを経由してｐＨ中和処理水槽３０に供給するためのｐＨ中和剤供給ポンプ２３ｐを備えることが好適である。 (pH neutralizer tank)
The pH neutralizer tank 20 contains a pH neutralizer 20W. The pH neutralizer tank 20 includes a pH neutralizer level switch 20c for detecting the amount of the pH neutralizer 20W, and a pH neutralizer supply passage 23L and a pH neutralizer dilution passage 33L. It is preferable to provide a pH neutralizing agent supply pump 23p for supplying the pH neutralizing treatment water tank 30 via.

（ｐＨ中和処理水槽）
ｐＨ中和処理水槽３０は、原水１０Ｗを中和処理するとともにそれにより得られるｐＨ中和処理水３０Ｗを収容する。ｐＨ中和処理水槽３０は、ｐＨ中和処理水３０ＷのｐＨを測定するためのｐＨ中和処理水ｐＨ計３０ｐｈ、ｐＨ中和処理水３０Ｗを撹拌するための攪拌機３０ｍ、ならびにｐＨ中和処理水３０ＷをｐＨ中和処理水槽３０からｐＨ中和剤希釈通路３３Ｌを経由してｐＨ中和処理水槽３０に循環させるためのｐＨ中和処理水循環ポンプ３３ｐを備えることが好適である。攪拌機３０ｍは、ｐＨ中和処理水槽３０内のｐＨ中和処理水３０Ｗを撹拌することによりそのｐＨを均一化できるものであれば特に制限はなく、プロペラ攪拌、ポンプ循環撹拌、超音波撹拌などが挙げられる。 (pH neutralization treatment water tank)
The pH-neutralized water tank 30 neutralizes the raw water 10W and stores the resulting pH-neutralized water 30W. The pH-neutralized water tank 30 includes a pH-neutralized water pH meter 30ph for measuring the pH of the pH-neutralized water 30W, a stirrer 30m for stirring the pH-neutralized water 30W, and the pH-neutralized water. It is preferable to provide a pH-neutralized water circulation pump 33p for circulating 30W from the pH-neutralized water tank 30 to the pH-neutralized water tank 30 via the pH neutralizer dilution passage 33L. The agitator 30m is not particularly limited as long as it can homogenize the pH by agitating the pH-neutralized water 30W in the pH-neutralized water tank 30, and includes propeller agitation, pump circulation agitation, ultrasonic agitation, and the like. mentioned.

（原水供給通路）
原水供給通路１３Ｌは、原水１０ＷをｐＨ中和処理水槽３０に供給するための通路である。原水供給通路１３Ｌは、原水１０Ｗの流量を測定するための原水流量計１３ｆ、ならびに通路の開閉および流量調節のためのバルブを備えることが好適である。 (Raw water supply passage)
The raw water supply passage 13L is a passage for supplying the raw water 10W to the pH-neutralized water tank 30. As shown in FIG. The raw water supply passage 13L preferably includes a raw water flow meter 13f for measuring the flow rate of the raw water 10W, and a valve for opening/closing the passage and adjusting the flow rate.

（ｐＨ中和剤供給通路）
ｐＨ中和剤供給通路２３Ｌは、ｐＨ中和剤２０ＷをｐＨ中和剤槽２０からｐＨ中和処理水槽３０に供給するための通路である。ｐＨ中和剤供給通路２３Ｌは、後述するｐＨ中和剤希釈通路３３Ｌに接続している。ｐＨ中和剤供給通路２３Ｌは、ｐＨ中和剤２０Ｗの逆流を防止するための逆止弁を備えることが好適である。 (pH neutralizer supply passage)
The pH neutralizing agent supply passage 23L is a passage for supplying the pH neutralizing agent 20W from the pH neutralizing agent tank 20 to the pH neutralizing water tank 30 . 23 L of pH neutralizer supply passages are connected to 33 L of pH neutralizer dilution passages mentioned later. The pH neutralizer supply passage 23L is preferably provided with a check valve for preventing backflow of the pH neutralizer 20W.

（ｐＨ中和剤希釈通路）
ｐＨ中和剤希釈通路３３Ｌは、ｐＨ中和剤供給通路２３Ｌから供給されたｐＨ中和剤２０ＷをｐＨ中和処理水槽３０から取り出したｐＨ中和処理水３０Ｗと混合することにより希釈してｐＨ中和処理水槽３０に供給する通路である。そのために、ｐＨ中和剤希釈通路３３Ｌは、その始端および終端がｐＨ中和処理水槽３０に接続し、かつ、その中間部がｐＨ中和剤供給通路２３Ｌに接続していることが好ましい。すなわち、ｐＨ中和処理水槽３０からから取り出したｐＨ中和処理水３０Ｗに、ｐＨ中和剤供給通路２３Ｌから供給されたｐＨ中和剤２０Ｗを混合することによりｐＨ中和剤２０Ｗを希釈して、希釈されたｐＨ中和剤２０Ｗを含むｐＨ中和処理水３０ＷをｐＨ中和処理水槽３０に戻すことにより、ｐＨ中和処理水３０Ｗを循環させながらｐＨ中和剤２０Ｗを希釈してｐＨ中和処理水槽３０に供給することができる。ｐＨ中和剤希釈通路３３Ｌは、その通路を循環するｐＨ中和処理水３０ＷとｐＨ中和剤供給通路２３Ｌから流入するｐＨ中和剤２０Ｗとを混合するための混合容器３３ｍ、ならびに通路の開閉および流量調節のためのバルブを備えることが好適である。ここで、ｐＨ中和剤供給通路２３ＬからｐＨ中和剤希釈通路３３ＬへのｐＨ中和剤２０Ｗの流入により、ｐＨ中和剤２０ＷとｐＨ中和剤希釈通路３３Ｌを循環するｐＨ中和処理水３０Ｗとの混合が可能であるが、両者の混合性を高める観点から、混合容器３３ｍは、たとえば、仕切壁、攪拌機、混合機などを備えていてもよい。 (pH neutralizer dilution passage)
The pH neutralizer dilution passage 33L mixes the pH neutralizer 20W supplied from the pH neutralizer supply passage 23L with the pH neutralized water 30W taken out from the pH neutralized water tank 30 to dilute the pH. It is a passage for supplying to the neutralization treatment tank 30 . For this reason, the pH neutralizer dilution passage 33L is preferably connected to the pH neutralization treatment water tank 30 at its beginning and end, and connected to the pH neutralizer supply passage 23L at its intermediate portion. That is, the pH neutralizing agent 20W supplied from the pH neutralizing agent supply passage 23L is mixed with the pH neutralizing water 30W taken out from the pH neutralizing water tank 30 to dilute the pH neutralizing agent 20W. , By returning the pH-neutralized water 30W containing the diluted pH-neutralizing agent 20W to the pH-neutralizing water tank 30, the pH-neutralizing agent 20W is diluted while the pH-neutralizing water 30W is circulated. It can be supplied to the sum treatment water tank 30 . The pH neutralizer dilution passage 33L includes a mixing vessel 33m for mixing the pH neutralized water 30W circulating through the passage with the pH neutralizer 20W flowing from the pH neutralizer supply passage 23L, and opening and closing of the passage. and valves for flow regulation. Here, due to the inflow of the pH neutralizer 20W from the pH neutralizer supply passage 23L to the pH neutralizer dilution passage 33L, the pH neutralized treated water circulating through the pH neutralizer 20W and the pH neutralizer dilution passage 33L. Although mixing with 30W is possible, the mixing container 33m may be provided with, for example, a partition wall, a stirrer, a mixer, etc. from the viewpoint of improving the mixing property of both.

（ｐＨ中和剤供給制御装置）
ｐＨ中和剤供給制御装置５０は、原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理（１次ｐＨ中和処理または粗ｐＨ中和処理）に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給する１次機構ならびにｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理（２次ｐＨ中和処理または精密ｐＨ中和処理）に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給する２次機構を有する。ｐＨ中和剤供給制御装置５０は、上記の１次機構によって、ｐＨ中和処理水３０ＷのｐＨの測定を持つことなく、ｐＨ中和処理水槽３０への原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより、原水１０ＷのｐＨ値の大小および水量の変動にかかわらず、迅速かつほぼ確実に原水１０ＷのｐＨ中和処理をすることができ、ｐＨ中和のために必要なｐＨ中和処理水槽３０内におけるｐＨ中和処理水３０Ｗの滞留時間を短くすることができ、ｐＨ中和処理水槽３０を小さくすることができる。また、ｐＨ中和剤供給制御装置５０は、上記の２次機構によって、ｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより、確実にｐＨ中和処理水３０ＷのさらなるｐＨ中和処理をすることができ、ｐＨ中和処理水３０Ｗの精密で確実なｐＨ中和処理ができる。 (pH neutralizer supply controller)
The pH neutralizer supply control device 50 calculates the flow rate of the pH neutralizer 20W required for pH neutralization of the raw water 10W (primary pH neutralization or rough pH neutralization) from the pH and flow rate of the raw water 10W. Further pH neutralization of the pH-neutralized water 30W (secondary pH neutralization or precision pH It has a secondary mechanism that calculates the flow rate of the pH neutralizer 20W required for neutralization treatment) and supplies it to the pH neutralization treatment water tank 30 . The pH-neutralizing agent supply control device 50 uses the primary mechanism described above to determine the pH of the raw water 10W from the pH and flow rate of the raw water 10W to the pH-neutralized water tank 30 without having to measure the pH of the pH-neutralized water 30W. By calculating the flow rate of the pH neutralizing agent 20W required for pH neutralization treatment and supplying it to the pH neutralization treatment tank 30, regardless of the magnitude of the pH value of the raw water 10W and fluctuations in the amount of water, it is possible to quickly and almost reliably perform the pH neutralization treatment. It is possible to neutralize the pH of the raw water 10W, shorten the retention time of the pH-neutralized water 30W in the pH-neutralized water tank 30 necessary for pH neutralization, and reduce the pH-neutralized water tank. 30 can be made smaller. In addition, the pH neutralizer supply control device 50 uses the secondary mechanism described above to control the pH neutralization required for further pH neutralization of the pH-neutralized water 30W based on the pH and water volume of the pH-neutralized water 30W. By calculating the flow rate of the agent 20W and supplying it to the pH neutralization treatment tank 30, the pH neutralization treatment of the pH neutralization treatment water 30W can be reliably performed further, and the pH neutralization treatment water 30W can be accurately and reliably treated. pH neutralization treatment can be performed.

（放流水槽）
放流水槽４０は、ｐＨ中和処理水槽３０から流出するｐＨ中和処理水３０Ｗを放流水４０Ｗとして収容する。放流水槽４０は、放流水４０ＷのｐＨを測定するための放流水ｐＨ計４０ｐｈ、放流水４０Ｗの量を検知するための放流水レベルスイッチ４０ｃ、ならびに放流水４０Ｗを後述する放流水還流通路４１Ｌを経由して原水槽１０に還流する放流水還流ポンプ４１ｐを備えることが好適である。また、放流水４０Ｗを放流水槽４０から自然放流する場合は、放流水槽４０は自然放流水通路４４Ｌを備え、自然放流水通路４４Ｌは自然放流水流量計４４ｆを備えることが好適である。また、放流水４０Ｗを放流水槽４０から強制放流（たとえば放流水槽４０より標高が高い場所に強制的に放流）する場合は、放流水４０Ｗを強制放流するための強制放流ポンプ４５ｐおよび強制放流水通路４５Ｌを備え、強制放流水通路４５Ｌは強制放流水流量計４５ｆを備えることが好適である。 (Discharge water tank)
The effluent water tank 40 stores the pH-neutralized water 30W flowing out from the pH-neutralized water tank 30 as the effluent water 40W. The effluent water tank 40 includes a effluent water pH meter 40ph for measuring the pH of the effluent water 40W, a effluent water level switch 40c for detecting the amount of the effluent water 40W, and a effluent water recirculation passage 41L described later for the effluent water 40W. It is preferable to provide a effluent water recirculation pump 41p for recirculating to the raw water tank 10 via. When the discharged water 40W is discharged naturally from the discharged water tank 40, it is preferable that the discharged water tank 40 is provided with a naturally discharged water passage 44L, and the naturally discharged water passage 44L is provided with a naturally discharged water flow meter 44f. When the effluent water 40W is forcibly discharged from the effluent water tank 40 (for example, forcibly discharged to a place higher in altitude than the effluent water tank 40), a forced discharge pump 45p for forcibly discharging the effluent water 40W and a forced discharge water passage 45L, and the forced discharge water passage 45L is preferably equipped with a forced discharge water flow meter 45f.

（放流水還流通路）
放流水還流通路４１Ｌは、放流水４０Ｗを放流水槽４０から取り出して原水槽１０に戻すことにより還流するための通路である。放流水還流通路４１Ｌは、通路の開閉および流量調節のためのバルブを備えることが好適である。 (Discharged water circulation passage)
The discharged water circulation passage 41L is a passage for returning the discharged water 40W from the discharged water tank 40 to the raw water tank 10 for circulation. The discharged water recirculation passage 41L is preferably provided with a valve for opening and closing the passage and adjusting the flow rate.

＜実施形態２：ｐＨ中和処理方法＞
図１を参照して、本実施形態のｐＨ中和処理方法は、実施形態１のｐＨ中和処理装置１を用いる原水１０ＷのｐＨ中和処理方法であって、ｐＨ中和剤希釈通路３３Ｌを循環するｐＨ中和処理水３０Ｗに、ｐＨ中和剤供給通路２３Ｌを通じてｐＨ中和剤２０Ｗを供給する際に、ｐＨ中和剤供給制御装置５０を用いて、原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより原水１０ＷのｐＨ中和処理を行う１次ｐＨ中和処理工程と、ｐＨ中和剤供給制御装置５０を用いて、ｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することによりｐＨ中和処理水のさらなるｐＨ中和処理を行う２次ｐＨ中和処理工程と、を備える。 <Embodiment 2: pH neutralization treatment method>
Referring to FIG. 1, the pH neutralization method of the present embodiment is a method of pH neutralization of raw water 10W using the pH neutralization apparatus 1 of Embodiment 1, in which the pH neutralizer dilution passage 33L is When supplying the pH neutralizing agent 20W to the circulating pH-neutralized water 30W through the pH neutralizing agent supply passage 23L, the pH neutralizing agent supply control device 50 is used to determine the raw water 10W from the pH and flow rate of the raw water 10W. a primary pH neutralization step of calculating the flow rate of the pH neutralizing agent 20W required for pH neutralization and supplying it to the pH neutralization treatment tank 30 to neutralize the raw water 10W; Using the additive supply control device 50, the flow rate of the pH neutralizing agent 20W required for further pH neutralization of the pH-neutralized water 30W is calculated based on the pH and the amount of the pH-neutralized water 30W. and a secondary pH neutralization step for further pH neutralizing the pH-neutralized water by supplying it to the neutralization treatment water tank 30 .

本実施形態のｐＨ中和処理方法は、ｐＨ中和剤希釈通路３３Ｌを循環するｐＨ中和処理水３０Ｗに、ｐＨ中和剤供給通路２３Ｌを通じてｐＨ中和剤２０Ｗを供給する際に、ｐＨ中和剤をｐＨ中和処理水に混合して希釈することにより撹拌効率を上げて中和反応時間を短縮するとともに、上記１次ｐＨ中和処理工程および２次ｐＨ中和処理工程を備えるため、小型のｐＨ中和処理装置を用いて確実なｐＨ中和処理が可能である。詳しくは、以下のとおりである。 In the pH neutralization method of the present embodiment, when the pH neutralizing agent 20W is supplied through the pH neutralizing agent supply passage 23L to the pH neutralizing treated water 30W circulating through the pH neutralizing agent dilution passage 33L, By mixing and diluting the admixture with the pH-neutralized water, the stirring efficiency is increased to shorten the neutralization reaction time, and the primary pH neutralization step and the secondary pH neutralization step are provided. A reliable pH neutralization treatment is possible using a small pH neutralization treatment apparatus. Details are as follows.

本実施形態のｐＨ中和処理方法は、ｐＨ中和剤希釈通路３３Ｌを循環するｐＨ中和処理水３０Ｗに、ｐＨ中和剤供給通路２３Ｌを通じてｐＨ中和剤２０Ｗを供給することから、ｐＨ中和剤２０ＷがｐＨ中和剤希釈通路３３Ｌを通るｐＨ中和処理水３０Ｗ（たとえばコンクリート粒子を含むアルカリ水溶液のｐＨ中和処理水）と混合して、ｐＨ中和処理水３０Ｗ内に残存する難溶解成分（たとえばコンクリート粒子）を溶解することができるため、難溶解成分からの流出成分（たとえばアルカリ成分）によるｐＨ中和処理水のｐＨ変動を抑制することができ、安定した確実なｐＨ中和処理ができる。また、ｐＨ中和剤２０ＷはｐＨ中和剤希釈通路３３Ｌ内のｐＨ中和処理水３０ＷによってｐＨ中和剤２０Ｗの濃度が希釈されて、ｐＨ中和処理水槽３０内のｐＨ中和処理水３０Ｗに大量供給されるため、ｐＨ中和処理水槽３０内のｐＨ中和処理水３０ＷのｐＨ中和反応の速度が高くなり、中和の際のｐＨの変動が抑制され、安定した確実なｐＨ中和処理ができる。 In the pH neutralization method of the present embodiment, the pH neutralizing agent 20W is supplied through the pH neutralizing agent supply passage 23L to the pH neutralizing treated water 30W circulating through the pH neutralizing agent dilution passage 33L. The blending agent 20W is mixed with the pH-neutralized water 30W (for example, the pH-neutralized water of alkaline aqueous solution containing concrete particles) passing through the pH neutralizer dilution passage 33L, and the hard matter remaining in the pH-neutralized water 30W is removed. Since dissolved components (for example, concrete particles) can be dissolved, it is possible to suppress pH fluctuations of pH-neutralized water due to outflow components (for example, alkaline components) from difficult-to-dissolve components, resulting in stable and reliable pH neutralization. can be processed. Further, the concentration of the pH neutralizing agent 20W is diluted by the pH neutralizing water 30W in the pH neutralizing agent dilution passage 33L, and the pH neutralizing water 30W in the pH neutralizing water tank 30 is diluted. , the pH neutralization reaction speed of the pH-neutralized water 30W in the pH-neutralized water tank 30 is increased, the pH fluctuation during neutralization is suppressed, and a stable and reliable pH is maintained. Can handle sums.

本実施形態のｐＨ中和処理方法は、１次ｐＨ中和処理工程において、原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより原水１０ＷのｐＨ中和処理（１次ｐＨ中和処理または粗ｐＨ中和処理）を行うため、原水１０ＷのｐＨおよび水量の変動にかかわらず、迅速にかつほぼ確実に原水１０ＷのｐＨ中和処理（１次ｐＨ中和処理または粗ｐＨ中和処理）をすることができ、ｐＨ中和のために必要なｐＨ中和処理水槽３０内におけるｐＨ中和処理水の滞留時間を短くすることができ、ｐＨ中和処理水槽３０を小さくすることができる。ここで、原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量とは、原水のｐＨを所望の中性領域（たとえば、河川放流の場合にはｐＨが５．８以上８．６以下、下水放流の場合はｐＨが５．０以上９．０以下）とするのに必要なｐＨ中和剤２０Ｗの流量をいう。 In the pH neutralization treatment method of the present embodiment, in the primary pH neutralization treatment step, the flow rate of the pH neutralizing agent 20W required for the pH neutralization treatment of the raw water 10W is calculated from the pH and the flow rate of the raw water 10W. Since the pH neutralization treatment (primary pH neutralization treatment or rough pH neutralization treatment) of the raw water 10W is performed by supplying it to the sum treatment tank 30, the pH of the raw water 10W and the amount of water fluctuate quickly and almost pH neutralization treatment (primary pH neutralization treatment or rough pH neutralization treatment) of raw water 10 W can be reliably performed, and pH neutralization treatment water in the pH neutralization treatment tank 30 necessary for pH neutralization retention time can be shortened, and the pH neutralization treatment tank 30 can be made smaller. Here, the flow rate of the pH neutralizing agent 20W required for the pH neutralization treatment of the raw water 10W means that the pH of the raw water is set to a desired neutral range (for example, in the case of river discharge, the pH is 5.8 to 8.6). Hereinafter, in the case of sewage discharge, the flow rate of the pH neutralizing agent 20W required to set the pH to 5.0 or more and 9.0 or less).

本実施形態のｐＨ中和処理方法は、２次ｐＨ中和処理工程において、ｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することによりｐＨ中和処理水３０ＷのさらなるｐＨ中和処理（２次ｐＨ中和処理または精密ｐＨ中和処理とこいう。以下同じ。）を行うため、確実にｐＨ中和処理水３０ＷのさらなるｐＨ中和処理をすることができ、ｐＨ中和処理水３０Ｗの精密で確実なｐＨ中和ができる。ここで、ｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量とは、ｐＨ中和処理水のｐＨを所望の中性領域（たとえば、河川放流の場合にはｐＨが５．８以上８．６以下、下水放流の場合はｐＨが５．０以上９．０以下）とするのに必要なｐＨ中和剤２０Ｗの流量をいう。なお、ｐＨ中和処理水３０Ｗの水量とは、ｐＨ中和処理水槽３０内およびｐＨ中和剤希釈通路３３Ｌ内に存在するｐＨ中和処理水３０Ｗの水量をいう。 In the pH neutralization treatment method of the present embodiment, in the secondary pH neutralization treatment step, based on the pH and water amount of the pH neutralization treatment water 30W, the pH inside the pH required for further pH neutralization treatment of the pH neutralization treatment water 30W Further pH neutralization of the pH-neutralized water 30W (referred to as secondary pH neutralization or precision pH neutralization; hereinafter the same) is performed by calculating the flow rate of the admixture 20W and supplying it to the pH-neutralization treatment water tank 30. ), the pH-neutralized water 30W can be reliably further pH-neutralized, and the pH-neutralized water 30W can be precisely and reliably pH-neutralized. Here, the flow rate of the pH neutralizing agent 20W required for further pH neutralization of the pH-neutralized water 30W means that the pH of the pH-neutralized water is in the desired neutral range (for example, in the case of river discharge, pH is 5.8 or more and 8.6 or less, in the case of sewage discharge, pH is 5.0 or more and 9.0 or less). The amount of pH-neutralized water 30W refers to the amount of pH-neutralized water 30W present in the pH-neutralized water tank 30 and the pH-neutralizing agent dilution passage 33L.

本実施形態のｐＨ中和処理方法において、１次ｐＨ中和処理工程および２次ｐＨ中和処理工程は、確実で安定した精密なｐＨ中和調整をする観点から、連続的にまたは間欠（歇）的に繰り返し行うことが好ましい。たとえば、所定時間毎に１次ｐＨ中和処理工程と２次ｐＨ中和処理工程とを繰り返し行うことが好ましい。 In the pH neutralization treatment method of the present embodiment, the primary pH neutralization treatment step and the secondary pH neutralization treatment step are performed continuously or intermittently (intermittently) from the viewpoint of reliable, stable and precise pH neutralization adjustment. ) is preferably repeated. For example, it is preferable to repeat the primary pH neutralization process and the secondary pH neutralization process every predetermined time.

本実施形態のｐＨ中和処理方法において用いられる実施形態１のｐＨ中和処理装置は、上述のように、ｐＨ中和剤供給制御装置５０がｐＨ中和剤２０Ｗの最大の流量に対して０．００１倍以下の流量の割合で段階的に流量制御ができることが好ましく、原水１０Ｗを収容するための原水槽１０と、ｐＨ中和処理水槽３０から流出するｐＨ中和処理水３０Ｗを放流水４０Ｗとして収容するための放流水槽４０と、放流水４０Ｗを放流水槽４０から取り出して原水槽１０に戻す放流水還流通路４１Ｌと、をさらに備えることが好ましい。 In the pH neutralization apparatus of Embodiment 1 used in the pH neutralization method of this embodiment, as described above, the pH neutralizer supply control apparatus 50 is set to 0 with respect to the maximum flow rate of the pH neutralizer 20W. It is preferable that the flow rate can be controlled stepwise at a flow rate ratio of 0.001 times or less. and a discharged water circulation passage 41L for taking out the discharged water 40W from the discharged water tank 40 and returning it to the raw water tank 10.

図１を参照して、本実施形態のｐＨ中和処理方法をより具体的に説明する。図１に示す実施形態１のｐＨ中和処理装置１を用いて、たとえば、原水１０Ｗであるコンクリート粒子を含むアルカリ水溶液をｐＨ中和剤である硫酸水溶液によりｐＨ中和処理をする。 The pH neutralization method of this embodiment will be described more specifically with reference to FIG. Using the pH neutralization apparatus 1 of Embodiment 1 shown in FIG. 1, for example, an alkaline aqueous solution containing concrete particles, which is raw water of 10 W, is pH neutralized with an aqueous sulfuric acid solution as a pH neutralizing agent.

原水供給ポンプを１３ｐを用いて原水槽１０から原水１０ＷをｐＨ中和処理水槽３０に供給する。ｐＨ中和剤供給制御装置５０を用いて、原水１０ＷのｐＨおよび流量から原水１０ＷのｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することにより原水１０ＷのｐＨ中和処理を行う（１次ｐＨ中和処理工程）。また、ｐＨ中和剤供給制御装置５０を用いて、ｐＨ中和処理水３０ＷのｐＨおよび水量に基づいてｐＨ中和処理水３０ＷのさらなるｐＨ中和処理に必要なｐＨ中和剤２０Ｗの流量を演算してｐＨ中和処理水槽３０に供給することによりｐＨ中和処理水３０ＷのさらなるｐＨ中和処理を行う（２次ｐＨ中和処理工程）。ここで、１次ｐＨ中和処理工程および２次ｐＨ中和処理工程は、それぞれ所定の工程時間で互いに交互に繰り返し行う。また、１次ｐＨ中和処理工程および２次ｐＨ中和処理工程におけるｐＨ中和剤２０Ｗの供給は、ｐＨ中和剤希釈通路３３Ｌを循環するｐＨ中和処理水３０Ｗに、ｐＨ中和剤供給通路２３Ｌを通じてｐＨ中和剤２０Ｗを供給することにより行う。 Raw water 10 W is supplied from the raw water tank 10 to the pH neutralization treatment tank 30 using the raw water supply pump 13p. Using the pH neutralizer supply control device 50, the flow rate of the pH neutralizer 20W required for the pH neutralization treatment of the raw water 10W is calculated from the pH and the flow rate of the raw water 10W, and the pH neutralizer 20W is supplied to the pH neutralization treatment tank 30. The raw water 10W is subjected to pH neutralization treatment (primary pH neutralization treatment step). Further, using the pH neutralizer supply control device 50, the flow rate of the pH neutralizer 20W required for further pH neutralization of the pH neutralized water 30W is adjusted based on the pH and the amount of the pH neutralized water 30W. Further pH neutralization of the pH-neutralized water 30W is performed by calculating and supplying to the pH-neutralized water tank 30 (secondary pH neutralization process). Here, the primary pH neutralization treatment step and the secondary pH neutralization treatment step are alternately and repeatedly performed for a predetermined step time. Further, the supply of the pH neutralizer 20W in the primary pH neutralization treatment step and the secondary pH neutralization treatment step is performed by supplying the pH neutralizer to the pH neutralized water 30W circulating in the pH neutralizer dilution passage 33L. This is done by supplying the pH neutralizer 20W through the passage 23L.

本明細書において、上記実施形態のｐＨ中和処理装置およびｐＨ中和処理方法について、原水であるアルカリ性水溶液をｐＨ中和剤である酸性溶液を用いてｐＨ中和処理する例を取り上げて説明しているが、原水である酸性水溶液をｐＨ中和剤であるアルカリ性水溶液を用いてｐＨ中和処理する例においても同様に適用できる。 In this specification, the pH neutralization apparatus and the pH neutralization method of the above embodiment will be described by taking up an example of pH neutralization of an alkaline aqueous solution, which is raw water, using an acidic solution, which is a pH neutralizer. However, it can also be applied to an example in which an acidic aqueous solution, which is raw water, is subjected to pH neutralization treatment using an alkaline aqueous solution, which is a pH neutralizer.

（実施例１）
コンクリート瓦礫が地下に大量に埋まってい新規ビルの建設現場における地下排水のｐＨ中和処理に関して、図１を参照して、容量２ｍ3の原水槽１０、容量１ｍ3の中和剤槽２０、容量２ｍ3のｐＨ中和処理水槽３０、および容量２ｍ3の放流水槽４０を備えるｐＨ中和処理装置１を用いて、原水１０Ｗであるコンクリート粒子を含むアルカリ水溶液のｐＨ中和処理を行った。原水１０ＷのｐＨは１０．５～１３．５の間で大きく変動した。原水の流量は１ｍ3／時～２０ｍ3／時の間で大きく変動した。原水の平均ｐＨは１１．２であり、原水の平均流量は１．５ｍ3／時であった。ｐＨ中和剤２０Ｗとして６３質量％の硫酸水溶液を用いた。ｐＨ中和処理水流量（ｐＨ中和処理水槽３０から流出するｐＨ中和処理水３０Ｗの流量を意味する。以下同じ。）は２０ｍ3／時とした。１次ｐＨ中和処理工程（工程時間：１秒）と２次ｐＨ中和処理工程（工程時間：１秒）とを交互に繰り返し行った。ｐＨ中和剤２０Ｗの流量制御は、原水のｐＨおよび流量に比例させて、最大流量の０．００１倍の流量で段階的に行った。また、ｐＨ中和剤２０Ｗの供給流量の脈動は、その時の供給流量に対して１０％以下であった。ここで、ｐＨ中和処理後の放流水４０ＷのｐＨ中和処理水槽３０から放流水槽４０への移動および放流水槽４０からの放流はいずれも水槽からのオーバーフローによって行った。また、放流水４０Ｗの放流水槽４０から原水槽１０への還流の必要はなかった。放流水の１時間当たりの平均放流水量は１日の間でも１ｍ3／時～２０ｍ3／時と変動が大きかった。 (Example 1)
Regarding the pH neutralization treatment of underground drainage at the construction site of a new building where a large amount of concrete rubble is buried underground, referring to FIG. Using the pH neutralization apparatus 1 having a pH neutralization treatment tank 30 of 2 m 3 and a discharge tank 40 of 2 m 3 capacity, a pH neutralization treatment was performed on a raw 10 W alkaline aqueous solution containing concrete particles. The pH of raw water 10W fluctuated greatly between 10.5 and 13.5. The raw water flow rate fluctuated greatly between 1 m 3 /hour and 20 m 3 /hour. The average pH of raw water was 11.2 and the average flow rate of raw water was 1.5 m 3 /h. A 63% by mass sulfuric acid aqueous solution was used as the pH neutralizer 20W. The flow rate of pH-neutralized water (meaning the flow rate of 30 W of pH-neutralized water flowing out of the pH-neutralized water tank 30; the same shall apply hereinafter) was 20 m 3 /hour. A primary pH neutralization process (process time: 1 second) and a secondary pH neutralization process (process time: 1 second) were alternately repeated. The flow rate of the pH neutralizer 20W was controlled stepwise at a flow rate of 0.001 times the maximum flow rate in proportion to the pH and flow rate of the raw water. Moreover, the pulsation of the supply flow rate of the pH neutralizer 20W was 10% or less of the supply flow rate at that time. Here, the movement of the effluent water 40W after the pH neutralization treatment from the pH neutralization treatment tank 30 to the discharge water tank 40 and the discharge from the discharge water tank 40 were all performed by overflow from the water tank. Moreover, it was not necessary to return the discharged water 40W from the discharge water tank 40 to the raw water tank 10. - 特許庁The average amount of discharged water per hour fluctuated from 1 m 3 /hour to 20 m 3 /hour even during one day.

上記のｐＨ中和処理における原水１０ＷのｐＨおよび流量の変動が最も大きかったある一日の原水１０ＷのｐＨ、ｐＨ中和処理水３０ＷのｐＨ、および放流水４０ＷのｐＨの変動を図２に示した。また、同じ日の原水１０Ｗの流量および放流水４０Ｗの流量の変動を図３に示した。図２および図３に示すように、原水１０ＷのｐＨおよび流量の変動が大きかったにもかかわらず、確実に安定して精密なｐＨ中和処理ができた。具体的には、図２に示すｐＨ中和処理水３０ＷのｐＨは、全ての測定点において５．０～９．０（下水放流の場合の中性領域）の範囲内にあり、ほとんどの測定点において５．８～８．６（河川放流の場合の中性領域）の範囲内にあった。また、図２に示す放流水４０ＷのｐＨは、全ての測定点で５．８～８．６（河川放流の場合の中性領域）の範囲内にあった。 FIG. 2 shows the pH fluctuations in the pH of the raw water 10W, the pH of the pH-neutralized water 30W, and the pH of the effluent water 40W on a day when the fluctuations in the pH and the flow rate of the raw water 10W in the above pH neutralization treatment were the largest. rice field. FIG. 3 shows the fluctuations in the flow rate of raw water 10 W and the flow rate of discharged water 40 W on the same day. As shown in FIGS. 2 and 3, although the pH and flow rate of raw water 10W fluctuated greatly, a stable and accurate pH neutralization treatment was achieved. Specifically, the pH of the pH-neutralized water 30W shown in FIG. points were within the range of 5.8 to 8.6 (neutral range in the case of river discharge). Further, the pH of the discharged water 40W shown in FIG. 2 was within the range of 5.8 to 8.6 (neutral range in the case of river discharge) at all measurement points.

また、硫酸水溶液と炭酸ガスとを用いて上記と同じ原水１０Ｗ（すなわちｐＨが１０．５～１３．５の間で大きく変動し平均が１１．２、流量が１ｍ3／時～２０ｍ3／時の間で大きく変動し平均が１．５ｍ3／時の原水）を同じ条件（すなわちｐＨ中和処理水流量２０ｍ3／時）でｐＨ中和処理するのに必要な従来のｐＨ中和処理装置は、容量２０ｍ3以上の原水槽、容量１ｍ3以上の硫酸水溶液槽、容量２０ｍ3以上の硫酸ｐＨ中和処理水槽、質量８００ｋｇ以上の液体炭酸ガスボンベ、容量２０ｍ3以上の炭酸ガスｐＨ中和処理水槽、および容量２０ｍ3以上の放流水槽を備え、これらを設置するのに必要な面積（必要設置面積）は、１６０ｍ2（８ｍ×２０ｍ）以上であった。これに加えて、従来のｐＨ中和処理装置を用いた場合は、ｐＨ中和処理水が放流基準を超える状況がしばしば発生した。 In addition, using an aqueous sulfuric acid solution and carbon dioxide gas, the same raw water of 10 W (that is, the pH fluctuates greatly between 10.5 and 13.5, the average is 11.2, and the flow rate is between 1 m 3 /h and 20 m 3 /h). The conventional pH neutralization equipment required for pH neutralization of raw water with an average of 1.5 m 3 /hour fluctuating greatly in A raw water tank with a capacity of 20 m 3 or more, a sulfuric acid aqueous solution tank with a capacity of 1 m 3 or more, a sulfuric acid pH neutralization treatment tank with a capacity of 20 m 3 or more, a liquid carbon dioxide cylinder with a mass of 800 kg or more, a carbon dioxide gas pH neutralization treatment tank with a capacity of 20 m 3 or more, and a discharge water tank with a capacity of 20 m 3 or more, and the area required for installing these (required installation area) was 160 m 2 (8 m×20 m) or more. In addition to this, when the conventional pH neutralization equipment was used, a situation often occurred in which the pH neutralized water exceeded the discharge standard.

これに対して、本実施例で用いたｐＨ中和処理装置１を設置するのに必要な面積（必要設置面積）は９．７２ｍ2（１．８ｍ×５．４ｍ）であった。すなわち、本実施例のｐＨ中和処理装置は、従来のｐＨ中和処理装置に比べて、ｐＨ中和処理水槽を従来の装置において少なくとも必要とされた２槽から１槽に削減し、ｐＨ中和処理水槽（本実施例のｐＨ中和処理装置においてはｐＨ中和処理水槽３０であり、従来のｐＨ中和処理装置においては硫酸ｐＨ中和処理水槽および炭酸ガスｐＨ中和処理水槽である）の全容積において０．０８３３倍（１／１２）以下で、必要設置面積において０．０６２５倍（１／１６）以下に小型化できた。 On the other hand, the area required for installing the pH neutralization apparatus 1 used in this example (required installation area) was 9.72 m 2 (1.8 m×5.4 m). That is, the pH neutralization treatment apparatus of the present embodiment reduces the number of pH neutralization treatment water tanks from at least two tanks required in the conventional apparatus to one tank as compared with the conventional pH neutralization treatment apparatus. Sum treatment tank (this is the pH neutralization treatment tank 30 in the pH neutralization treatment apparatus of this embodiment, and the sulfuric acid pH neutralization treatment tank and the carbon dioxide gas pH neutralization treatment tank in the conventional pH neutralization treatment apparatus) The total volume of the motor was reduced to 0.0833 times (1/12) or less, and the required installation area was reduced to 0.0625 times (1/16) or less.

すなわち、本実施例のｐＨ中和処理装置を用いたｐＨ中和処理方法によれば、小型のｐＨ中和処理装置を用いて確実的なｐＨ中和処理が可能となった。 That is, according to the pH neutralization method using the pH neutralization apparatus of this embodiment, reliable pH neutralization can be performed using a small-sized pH neutralization apparatus.

今回開示された実施の形態および実施例はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施の形態および実施例ではなく特許請求の範囲によって示され、特許請求の範囲と均等の意味、および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above-described embodiments and examples, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

１ ｐＨ中和処理装置、１０ 原水槽、１０Ｗ 原水、１０ｃ 原水レベルスイッチ、１０ｐｈ 原水ｐＨ計、１３Ｌ 原水供給通路、１３ｆ 原水流量計、１３ｐ 原水供給ポンプ、２０ ｐＨ中和剤槽、２０Ｗ ｐＨ中和剤、２０ｃ ｐＨ中和剤レベルスイッチ、２３Ｌ ｐＨ中和剤供給通路、２３ｐ ｐＨ中和剤供給ポンプ、３０ ｐＨ中和処理水槽、３０Ｗ ｐＨ中和処理水、３０ｍ 撹拌機、３０ｐｈ ｐＨ中和処理水ｐＨ計、３３Ｌ ｐＨ中和剤希釈通路、３３ｍ 混合容器、３３ｐ ｐＨ中和処理水循環ポンプ、４０ 放流水槽、４０Ｗ 放流水、４０ｃ 放流水レベルスイッチ、４０ｐｈ 放流水ｐＨ計、４１Ｌ 放流水還流通路、４１ｐ 放流水還流ポンプ、４４Ｌ 自然放流水通路、４４ｆ 自然放流水流量計、４５Ｌ 強制放流水通路、４５ｆ 強制放流水流量計、４５ｐ 強制放流ポンプ、５０ ｐＨ中和剤供給制御装置。 1 pH neutralization treatment device, 10 raw water tank, 10W raw water, 10c raw water level switch, 10ph raw water pH meter, 13L raw water supply passage, 13f raw water flow meter, 13p raw water supply pump, 20 pH neutralizer tank, 20W pH neutralization agent, 20c pH neutralizer level switch, 23L pH neutralizer supply passage, 23p pH neutralizer supply pump, 30 pH neutralization treatment water tank, 30W pH neutralization treatment water, 30m Stirrer, 30ph pH neutralization treatment water pH meter, 33L pH neutralizer dilution passage, 33m Mixing vessel, 33p pH neutralized water circulation pump, 40 Discharge water tank, 40W Discharged water, 40c Discharged water level switch, 40ph Discharged water pH meter, 41L Discharged water reflux passage, 41p Discharged water reflux pump, 44L natural discharge water passage, 44f natural discharge water flow meter, 45L forced discharge water passage, 45f forced discharge water flow meter, 45p forced discharge pump, 50 pH neutralizer supply controller.

Claims (4)

ｐＨ中和剤を収容するためのｐＨ中和剤槽と、原水をｐＨ中和処理するとともにそれにより得られるｐＨ中和処理水を収容するためのｐＨ中和処理水槽と、前記原水を前記ｐＨ中和処理水槽に供給する原水供給通路と、前記ｐＨ中和剤槽から前記ｐＨ中和剤を供給するｐＨ中和剤供給通路と、前記ｐＨ中和剤供給通路から供給された前記ｐＨ中和剤を前記ｐＨ中和処理水槽から取り出した前記ｐＨ中和処理水と混合することにより希釈して前記ｐＨ中和処理水槽に供給するｐＨ中和剤希釈通路と、前記原水のｐＨおよび流量から前記原水のｐＨ中和処理に必要な前記ｐＨ中和剤の流量を演算して前記ｐＨ中和処理水槽に供給する１次機構ならびに前記ｐＨ中和処理水のｐＨおよび水量に基づいて前記ｐＨ中和処理水のさらなるｐＨ中和処理に必要な前記ｐＨ中和剤の流量を演算して前記ｐＨ中和処理水槽に供給する２次機構を有するｐＨ中和剤供給制御装置と、を備え、
前記ｐＨ中和剤供給通路は前記ｐＨ中和剤希釈通路に接続しており、
前記ｐＨ中和剤は、強酸である硫酸の１種類の中和剤のみを用い、
前記ｐＨ中和処理水槽は１槽であり、
前記ｐＨ中和剤供給制御装置は、前記ｐＨ中和剤の最大の流量に対して０．００１倍以下の流量の割合で段階的に流量制御ができるｐＨ中和処理装置。 a pH-neutralizing tank for containing a pH-neutralizing agent; a pH-neutralizing tank for containing pH-neutralized raw water and resulting pH-neutralized water; A raw water supply passage for supplying a neutralizing treatment tank, a pH neutralizer supply passage for supplying the pH neutralizer from the pH neutralizer tank, and the pH neutralizer supplied from the pH neutralizer supply passage. a pH-neutralizing agent dilution passage for diluting the agent with the pH-neutralized water taken out from the pH-neutralizing water tank and supplying the pH-neutralizing agent to the pH-neutralizing water tank; A primary mechanism for calculating the flow rate of the pH neutralizing agent required for pH neutralization of raw water and supplying it to the pH neutralizing treatment water tank, and the pH neutralization based on the pH and the amount of the pH neutralizing treated water. a pH neutralizer supply control device having a secondary mechanism for calculating the flow rate of the pH neutralizer necessary for further pH neutralization of the treated water and supplying the pH neutralizer to the pH neutralization water tank;
The pH neutralizer supply passage is connected to the pH neutralizer dilution passage,
The pH neutralizer uses only one type of neutralizer, sulfuric acid, which is a strong acid,
The pH neutralization treatment tank is one tank,
The pH neutralizer supply control device is a pH neutralization processing device capable of stepwise flow rate control at a flow rate of 0.001 times or less of the maximum flow rate of the pH neutralizer. 前記原水を収容するための原水槽と、前記ｐＨ中和処理水槽から流出する前記ｐＨ中和処理水を放流水として収容するための放流水槽と、をさらに備える請求項１に記載のｐＨ中和処理装置。 The pH neutralization according to claim 1, further comprising: a raw water tank for containing the raw water; and a discharge water tank for containing the pH-neutralized water flowing out from the pH-neutralized water tank as discharged water. processing equipment. 前記放流水を前記放流水槽から取り出して前記原水槽に戻すことにより還流するための放流水還流通路、をさらに備える請求項２に記載のｐＨ中和処理装置。 3. The pH neutralization treatment apparatus according to claim 2, further comprising a effluent water recirculation passage for taking out the effluent water from the effluent water tank and returning it to the raw water tank. 請求項１から請求項３のいずれか１項に記載のｐＨ中和処理装置を用いる前記原水のｐＨ中和処理方法であって、
前記ｐＨ中和剤を前記ｐＨ中和剤供給通路および前記ｐＨ中和剤希釈通路を通じて前記ｐＨ中和処理水槽に供給する際に、
前記ｐＨ中和剤供給制御装置を用いて、前記原水のｐＨおよび流量から前記原水のｐＨ中和処理に必要な前記ｐＨ中和剤の流量を演算して前記ｐＨ中和処理水槽に供給することにより前記原水のｐＨ中和処理を行う１次ｐＨ中和処理工程と、
前記ｐＨ中和剤供給制御装置を用いて、前記ｐＨ中和処理水のｐＨおよび水量に基づいて前記ｐＨ中和処理水のさらなるｐＨ中和処理に必要な前記ｐＨ中和剤の流量を演算して前記ｐＨ中和処理水槽に供給することにより前記ｐＨ中和処理水のさらなるｐＨ中和処理を行う２次ｐＨ中和処理工程と、を備え、
前記ｐＨ中和剤は、強酸である硫酸の１種類の中和剤のみを用い、
前記ｐＨ中和処理水槽は１槽であり、
前記ｐＨ中和剤供給制御装置は、前記ｐＨ中和剤の最大の流量に対して０．００１倍以下の流量の割合で段階的に流量制御するｐＨ中和処理方法。 A pH neutralization method for the raw water using the pH neutralization apparatus according to any one of claims 1 to 3,
When supplying the pH neutralizing agent to the pH neutralizing water tank through the pH neutralizing agent supply passage and the pH neutralizing agent dilution passage,
Using the pH neutralizer supply control device, the flow rate of the pH neutralizer required for the pH neutralization treatment of the raw water is calculated from the pH and the flow rate of the raw water, and the pH neutralizer is supplied to the pH neutralization treatment tank. A primary pH neutralization treatment step of performing pH neutralization treatment of the raw water by
Using the pH neutralizer supply control device, the flow rate of the pH neutralizer required for further pH neutralization of the pH neutralized water is calculated based on the pH and the amount of the pH neutralized water. a secondary pH neutralization step of further performing pH neutralization of the pH-neutralized water by supplying the pH-neutralized water to the pH-neutralized water tank ;
The pH neutralizer uses only one type of neutralizer, sulfuric acid, which is a strong acid,
The pH neutralization treatment tank is one tank,
The pH neutralization treatment method, wherein the pH neutralizer supply controller controls the flow rate stepwise at a rate of 0.001 times or less of the maximum flow rate of the pH neutralizer.
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