JP2017104870A - Method for producing strongly acidic water and strongly alkaline water - Google Patents
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本発明は、強酸性水および強アルカリ性水の製造方法に関する。 The present invention relates to a method for producing strongly acidic water and strongly alkaline water.
酸性水やアルカリ性水は、排水や土壌などを所望のｐＨ値に調節するためのｐＨ調整水として、また、金属や回路基板などに付着した汚れ（有機物、錆など）を分解して洗浄するための洗浄水として、使用されている。このような用途には塩酸や硫酸などの薬品を使用することが効果的ではあるが、その保管・運搬・取扱時の危険性や、処理後の廃棄による環境汚染の問題などを考慮すると、安全で無害な酸性水・アルカリ性水の使用が好ましい。 Acidic and alkaline water is used as pH-adjusted water for adjusting drainage and soil to a desired pH value, and for decomposing and cleaning dirt (organic matter, rust, etc.) adhering to metals and circuit boards. It is used as washing water. It is effective to use chemicals such as hydrochloric acid and sulfuric acid for such applications, but considering the dangers of storage, transportation and handling, and environmental pollution problems due to disposal after treatment, And harmless acidic water and alkaline water are preferred.
酸性水やアルカリ性水の製造方法としては、下記特許文献１に記載されるように、原水をイオン交換樹脂に通水してイオン交換させる方法が知られている。すなわち、原水を強酸性カチオン交換樹脂を用いた塔に通水させると、原水中のＣａ＋、Ｍｇ＋、Ｎａ＋、Ｋ＋などのカチオンが強酸性カチオン交換樹脂に電着されているＨ＋（水素イオン）を置換するので、通水後の処理済水のＨ＋が増加して酸性水が得られる。また、原水を強アルカリ性アニオン交換樹脂を用いた塔に通水させると、原水中のＣｌ−、ＮＯ３ −、ＳＯ４ ２−、ＨＣＯ３ −などのアニオンが強酸性アニオン交換樹脂に電着されているＯＨ−（水酸化イオン）を置換するので、通水後の処理済水のＯＨ−が増加してアルカリ性水が得られる。 As a method for producing acidic water or alkaline water, a method is known in which raw water is passed through an ion exchange resin for ion exchange as described in Patent Document 1 below. That is, when is passed through the column using a strongly acidic cation exchange resin raw water, the raw water Ca +, Mg +, Na + , cations such as K + is electrodeposited on a strongly acidic cation exchange resin H + Since (hydrogen ion) is replaced, H + of treated water after passing water is increased and acidic water is obtained. In addition, when raw water is passed through a tower using a strong alkaline anion exchange resin, anions such as Cl − , NO 3 − , SO 4 2− and HCO 3 − in the raw water are electrodeposited onto the strongly acidic anion exchange resin. Since OH − (hydroxide ion) is substituted, OH − of the treated water after passing water is increased, and alkaline water is obtained.
ところが、この従来法によると、イオン交換塔を通水させた後に得られる処理済水のｐＨは、酸性水の場合でｐＨ３程度、アルカリ性水の場合でｐＨ１１程度が限界であり、それ以上の強酸性水・強アルカリ性水を得ることができなかった。このため、前述のｐＨ調整や洗浄の効果が必ずしも十分ではなかった。 However, according to this conventional method, the pH of the treated water obtained after passing water through the ion exchange tower is limited to about pH 3 in the case of acidic water, and about pH 11 in the case of alkaline water. Water or strong alkaline water could not be obtained. For this reason, the effects of pH adjustment and cleaning described above are not always sufficient.
したがって、本発明が解決しようとする課題は、ｐＨ１．５以下の強酸性水およびｐＨ１２．５以上の強アルカリ性水を効率的に製造することができる新規な方法を提供することである。 Therefore, the problem to be solved by the present invention is to provide a novel method capable of efficiently producing strongly acidic water having a pH of 1.5 or less and strongly alkaline water having a pH of 12.5 or more.
ここで、本発明者は、原水の電気伝導度に着目した。特許文献１にも記載されるように、原水をイオン交換塔に通水させて酸性化またはアルカリ性化の処理を行うと徐々に電着イオン（Ｈ＋またはＯＨ−）が失われていくので、薬剤（ＨＣｌ，ＮａＯＨなど）を投入して電着イオン量を増大させる操作（再生）を行う必要があるが、原水の電気伝導度が高いと再生を頻繁に行わなければならず、処理効率が低下する。このため、従来は、原水の電気伝導度を積極的に増大させることは当業者の技術常識に反するものであった。本発明者は、この技術常識に反して原水の電気伝導度を増大させることによってより強酸化・強アルカリ化を実現できることを見出し、この知見に基いてさらに試験と研究を重ねた結果、本発明に到達した。 Here, this inventor paid attention to the electrical conductivity of raw | natural water. As described in Patent Document 1, when the raw water is passed through an ion exchange tower and subjected to acidification or alkalinization treatment, electrodeposited ions (H + or OH − ) are gradually lost. It is necessary to perform an operation (regeneration) to increase the amount of electrodeposited ions by adding a chemical (HCl, NaOH, etc.), but if the raw water has a high electrical conductivity, the regeneration must be performed frequently, and the processing efficiency is increased. descend. For this reason, conventionally, it has been contrary to the technical common sense of those skilled in the art to actively increase the electrical conductivity of raw water. The present inventor found that it is possible to realize stronger oxidation and stronger alkalinity by increasing the electrical conductivity of raw water against this technical common sense, and as a result of further testing and research based on this finding, the present invention Reached.
すなわち、上記課題を解決するための手段として、請求項１に係る本発明は、電気伝導度が２５０μＳ／ｃｍ以下である原水にＮａＣｌ、Ｋ（ＯＨ）またはＣａ（ＯＨ）のいずれか一または任意混合液を溶解させ、あるいは、電気伝導度が２５０μＳ／ｃｍ以下である原水にＮａ金属を溶解させることにより、前記原水の電気伝導度を１０，０００〜１５，０００μＳ／ｃｍに増大させる予備処理を行った後に、これを強酸性カチオン交換樹脂に通水させてｐＨ１．５以下の酸性水を製造することを特徴とする、酸性水の製造方法である。 That is, as means for solving the above-mentioned problems, the present invention according to claim 1 is directed to any one or any of NaCl, K (OH) and Ca (OH) in raw water having an electric conductivity of 250 μS / cm or less. mixture dissolved, or by electrical conductivity dissolving Na metal to the raw water or less 250 [mu] S / cm, the pretreatment increasing the electrical conductivity of the raw water to 10,000~15,000μS / cm This is a method for producing acidic water, characterized in that, after being carried out, this is passed through a strongly acidic cation exchange resin to produce acidic water having a pH of 1.5 or lower.
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請求項２に係る本発明は、電気伝導度が２５０μＳ／ｃｍ以下である原水にＮａＣｌを溶解させ、あるいは、電気伝導度が２５０μＳ／ｃｍ以下である原水に塩素ガスを溶解させることにより、前記原水の電気伝導度を１０，０００〜１５，０００μＳ／ｃｍに増大させる予備処理を行った後に、これを強アルカリ性アニオン交換樹脂に通水させてｐＨ１２．５以上のアルカリ性水を製造することを特徴とする、アルカリ性水の製造方法である。 The present invention according to claim 2, electrical conductivity is dissolved NaCl in raw water or less 250 [mu] S / cm, or, by electrical conductivity dissolved chlorine gas in the raw water is not more than 250 [mu] S / cm, the raw water After conducting a pretreatment to increase the electrical conductivity of the resin to 10,000 to 15,000 μS / cm, it is passed through a strong alkaline anion exchange resin to produce alkaline water having a pH of 12.5 or more. This is a method for producing alkaline water.
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本発明によれば、ｐＨ１．５以下の強酸性水を効率的に製造することができる。この強酸性水は、排水や土壌などを所望のｐＨ値に調節するためのｐＨ調整水として、また、金属やスライムなどに付着・混入した汚れ（たんぱく質などの有機物）を分解して洗浄するための洗浄水として好適に用いることができる。また、この強酸性水は、安価で入手容易な地下水や水道水などを原水に用い、この原水を強酸性カチオン交換樹脂に通水することで該イオン交換樹脂に電着されているＨ＋（水素イオン）をイオン交換を介して増大させるものであるため、安価且つ効率的に大量生産することが可能である。さらに、この強酸性水は、人の肌に触れても全く無害であり、刺激や臭気もほとんど無いので、その保管・運搬・取扱時の危険性がなく、処理後の廃棄による環境汚染の問題も生じない。 According to the present invention, strongly acidic water having a pH of 1.5 or less can be efficiently produced. This strongly acidic water is used as pH-adjusted water for adjusting drainage, soil, etc. to a desired pH value, and for decomposing and washing dirt (proteins and other organic substances) adhering to and mixed in metals and slimes. The washing water can be suitably used. In addition, the strongly acidic water is H + (which is electrodeposited on the ion exchange resin by using inexpensive and easily available ground water or tap water as raw water and passing the raw water through the strongly acidic cation exchange resin. Hydrogen ions) are increased through ion exchange, and therefore, mass production can be performed inexpensively and efficiently. Furthermore, this strongly acidic water is completely harmless even if it touches human skin, and there is almost no irritation or odor, so there is no danger in storage, transportation and handling, and there is a problem of environmental pollution due to disposal after treatment. Does not occur.
また、本発明によれば、ｐＨ１２.５以上の強アルカリ性水を効率的に製造することができる。この強アルカリ性水は、排水や土壌などを所望のｐＨ値に調節するためのｐＨ調整水として、また、金属に発生した錆をＯＨ−（水酸化イオン）との接触による化学反応で水酸化被膜を形成するための錆除去水として好適に用いることができる。また、この強アルカリ性水は、安価で入手容易な地下水や水道水などを原水に用い、この原水を強アルカリ性アニオン交換樹脂に通水することで該イオン交換樹脂に電着されているＯＨ−（水酸化イオン）をイオン交換を介して増大させるものであるため、安価且つ効率的に大量生産することが可能である。さらに、この強アルカリ性水は、人の肌に触れても全く無害であり、刺激や臭気もほとんど無いので、その保管・運搬・取扱時の危険性がなく、処理後の廃棄による環境汚染の問題も生じない。 Further, according to the present invention, strong alkaline water having a pH of 12.5 or more can be efficiently produced. This strongly alkaline water is used as a pH-adjusted water for adjusting drainage, soil, etc. to a desired pH value, and the rust generated on the metal is subjected to a chemical reaction by contact with OH − (hydroxide ion). It can be suitably used as rust-removed water for forming. In addition, the strongly alkaline water is made of OH − (which is electrodeposited on the ion exchange resin by using inexpensive and easily available ground water or tap water as raw water and passing the raw water through the strongly alkaline anion exchange resin. (Hydroxide ion) is increased through ion exchange, so that mass production can be performed inexpensively and efficiently. In addition, this strongly alkaline water is completely harmless even if it touches human skin, and there is almost no irritation or odor, so there is no danger of storage, transportation and handling, and environmental pollution problems caused by disposal after treatment. Does not occur.
＜強酸性水の製造＞
本発明による強酸性水の製造方法について説明する。原水には純水を用いても良いが、地下水や水道水、河川水など安価で入手容易なものを使用すると低コストで強酸性水を製造することができるので好ましい。通常、これらの水はｐＨ６〜８程度であり、電気伝導度は２５０μＳ／ｃｍ以下である。
<Manufacture of strong acid water>
A method for producing strongly acidic water according to the present invention will be described. Pure water may be used as the raw water, but it is preferable to use inexpensive and easily available materials such as ground water, tap water, and river water because strong acid water can be produced at low cost. Usually, these waters have a pH of about 6 to 8 and an electric conductivity of 250 μS / cm or less.
この原水にＮａＣｌ、Ｋ（ＯＨ）またはＣａ（ＯＨ）のいずれか一または任意混合液を溶解させることにより、原水の電気伝導度を上昇させる予備処理を行った後、常法により強酸性カチオン交換樹脂に通水させることによって、原水中のＮａ＋、Ｋ＋、Ｃａ＋などのカチオンが、強酸性カチオン交換樹脂に電着されているＨ＋（水素イオン）を置換し、通水後の処理済水のＨ＋が増加してｐＨ値が低下していく。中でもＮａＣｌは、安価で入手容易であり、原水に良く溶けて無色透明であり、イオン交換後も沈殿物を生じないので、ＮａＣｌを用いて予備処理を行うことが好ましい。 After conducting a pretreatment to increase the electrical conductivity of raw water by dissolving any one or any mixed solution of NaCl, K (OH) or Ca (OH) in this raw water, strong acidic cation exchange is performed by a conventional method. By passing water through the resin, cations such as Na + , K + , and Ca + in the raw water replace H + (hydrogen ions) electrodeposited on the strongly acidic cation exchange resin, and the treatment after the water flow pH value H + increases the already water decreases. Of these, NaCl is inexpensive and easily available, dissolves well in raw water, is colorless and transparent, and does not produce a precipitate even after ion exchange. Therefore, pretreatment with NaCl is preferable.
本発明者は、強酸性カチオン交換樹脂に通水させる時点の原水の電気伝導度と、通水後の処理済水のｐＨ値との関係を調べるための試験を行った。原水として、電気伝導度が０〜２５０μＳ／ｃｍの範囲で様々に異なる地下水（ｐＨ７．２〜７．８）を用意し、各原水１００リットルにＮａＣｌ水溶液の添加量を変えることにより、原水の電気伝導度を５００μＳ／ｃｍ、１，０００μＳ／ｃｍ、３，０００μＳ／ｃｍ、５，０００μＳ／ｃｍ、８，０００μＳ／ｃｍ、１０，０００μＳ／ｃｍ、１５，０００μＳ／ｃｍ、１８，０００μＳ／ｃｍ、２０，０００μＳ／ｃｍおよび２５，０００μＳ／ｃｍとする予備処理を行った。予備処理後の原水を強酸性カチオン交換樹脂（三菱化学「ダイヤイオン（登録商標）ＳＫ−１Ｂ」再生済）に通水線速度ＬＶ２０ｍ／ｈで通水させ、その処理済水のｐＨを測定した。結果は表１に示す通りであった。 This inventor conducted the test for investigating the relationship between the electrical conductivity of the raw | natural water at the time of passing water through a strong acid cation exchange resin, and the pH value of the treated water after water flow. As raw water, various different groundwaters (pH 7.2 to 7.8) having electrical conductivity in the range of 0 to 250 μS / cm are prepared, and the amount of NaCl aqueous solution added to 100 liters of each raw water is changed. Conductivity of 500 μS / cm, 1,000 μS / cm, 3,000 μS / cm, 5,000 μS / cm, 8,000 μS / cm, 10,000 μS / cm, 15,000 μS / cm, 18,000 μS / cm, 20 Preliminary treatments of 5,000 μS / cm and 25,000 μS / cm were performed. The raw water after the pretreatment was passed through a strongly acidic cation exchange resin (Mitsubishi Chemical “Diaion (registered trademark) SK-1B” regenerated) at a water passage speed of LV 20 m / h, and the pH of the treated water was measured. . The results were as shown in Table 1.
この結果から、原水の電気伝導度を上昇させるにつれて処理済水のｐＨを低下させて強酸化させることができ、電気伝導度を１０，０００μＳ／ｃｍまで上昇させるとｐＨ１．５の強酸性水を得ることができるが、１５，０００μＳ／ｃｍを超えてさらに電気伝導度を上昇させてもｐＨを低下させる効果がほぼ頭打ちになることが分かった。また、後述するように、ｐＨ１．５の強酸性水は、きわめて短時間で有機物を溶解除去する能力を発揮することが確認された。したがって、コストや処理効率を考慮すれば、強酸性カチオン交換樹脂に通水させる前に行う予備処理は、原水の電気伝導度を１０，０００〜１５，０００μＳ／ｃｍに上昇させることが好ましい。 From this result, as the electrical conductivity of the raw water is increased, the pH of the treated water can be lowered and strongly oxidized, and when the electrical conductivity is increased to 10,000 μS / cm, strongly acidic water having a pH of 1.5 is obtained. Although it can be obtained, it has been found that even if the electric conductivity is further increased beyond 15,000 μS / cm, the effect of lowering the pH almost reaches its peak. Further, as will be described later, it was confirmed that strongly acidic water having a pH of 1.5 exhibits the ability to dissolve and remove organic substances in a very short time. Therefore, in consideration of cost and treatment efficiency, it is preferable to increase the electrical conductivity of the raw water to 10,000 to 15,000 μS / cm in the preliminary treatment performed before passing through the strongly acidic cation exchange resin.
通水処理済液の洗浄能力を確認するために、次の試験を行った。すなわち、上記サンプル番号６の通水処理済液２００ｃｃをビーカーに取り、ここに有機物（たんぱく質）が付着して汚れている１０円玉を投入したところ、３０〜６０秒で１０円玉の端の部分から有機物が溶解し始め、６０〜１８０秒経過した時点で１０円玉全体に有機物の溶解が拡がり、全体的に銅本来の色に戻った。同様の試験を上記サンプル番号４および５の通水処理済液についても行ったが、有機物が溶解し始めるまでに１時間以上を要し、ほぼ完全に洗浄するまでに１０時間以上を要した。この結果から、強酸性水として十分な洗浄能力を発揮するためにはｐＨ１．５以下であることが好ましいことが分かった。 In order to confirm the cleaning ability of the water-treated liquid, the following test was performed. That is, when 200 cc of the water-treated solution of sample number 6 is taken in a beaker and a 10-yen coin contaminated with organic matter (protein) is added thereto, the end of the 10-yen coin is removed in 30 to 60 seconds. The organic matter started to dissolve from the portion, and when 60 to 180 seconds passed, the dissolution of the organic matter spread over the entire 10-yen coin, and the entire color returned to the original color of copper. The same test was conducted on the water-treated liquids of Sample Nos. 4 and 5, however, it took 1 hour or more until the organic substance started to dissolve, and 10 hours or more until it was almost completely washed. From this result, it was found that the pH is preferably 1.5 or less in order to exhibit sufficient washing ability as strongly acidic water.
上記試験においてはＮａＣｌ水溶液を原水に溶解させることで電気伝導度を増大させる予備処理を行ったが、これに代えて、Ｎａ金属を原水に溶解させることで電気伝導度を増大させる予備処理を行うことについても試験を行った。すなわち、上記と同様に、電気伝導度が０〜２５０μＳ／ｃｍの範囲で様々に異なる原水（ｐＨ７．２〜７．８の地下水）各１００リットルにＮａ金属を溶解させることにより、原水の電気伝導度を５００μＳ／ｃｍ、１，０００μＳ／ｃｍ、３，０００μＳ／ｃｍ、５，０００μＳ／ｃｍ、８，０００μＳ／ｃｍ、１０，０００μＳ／ｃｍ、１５，０００μＳ／ｃｍ、１８，０００μＳ／ｃｍ、２０，０００μＳ／ｃｍおよび２５，０００μＳ／ｃｍとする予備処理を行った。予備処理後の原水を強酸性カチオン交換樹脂（三菱化学「ダイヤイオン（登録商標）ＳＫ−１Ｂ」再生済）に通水線速度ＬＶ２０ｍ／ｈで通水させ、その処理済水のｐＨを測定したところ、表１と同じ結果が得られた。 In the above test, a pretreatment for increasing the electrical conductivity by dissolving the NaCl aqueous solution in the raw water was performed. Instead, a pretreatment for increasing the electric conductivity by dissolving the Na metal in the raw water is performed. This was also tested. That is, similarly to the above, by dissolving Na metal in each 100 liters of raw water (ground water having a pH of 7.2 to 7.8) having different electrical conductivities in the range of 0 to 250 μS / cm, The degree is 500 μS / cm, 1,000 μS / cm, 3,000 μS / cm, 5,000 μS / cm, 8,000 μS / cm, 10,000 μS / cm, 15,000 μS / cm, 18,000 μS / cm, 20,000 Pretreatment was performed at 000 μS / cm and 25,000 μS / cm. The raw water after the pretreatment was passed through a strongly acidic cation exchange resin (Mitsubishi Chemical “Diaion (registered trademark) SK-1B” regenerated) at a water passage speed of LV 20 m / h, and the pH of the treated water was measured. However, the same results as in Table 1 were obtained.
（強アルカリ水の製造）
本発明による強アルカリ性水の製造方法について説明する。原水には純水を用いても良いが、地下水や水道水、河川水など安価で入手容易なものを使用すると低コストで強酸性水を製造することができるので好ましい。通常、これらの水はｐＨ６〜８程度であり、電気伝導度は２５０μＳ／ｃｍ以下である。
(Manufacture of strong alkaline water)
A method for producing strongly alkaline water according to the present invention will be described. Pure water may be used as the raw water, but it is preferable to use inexpensive and easily available materials such as ground water, tap water, and river water because strong acid water can be produced at low cost. Usually, these waters have a pH of about 6 to 8 and an electric conductivity of 250 μS / cm or less.
この原水にＮａＣｌを溶解させることにより、原水の電気伝導度を上昇させる予備処理を行った後、常法により強アルカリ性アニオン交換樹脂に通水させることによって、原水中のＣｌ−が強アルカリ性アニオン交換樹脂に電着されているＯＨ−（水酸化イオン）を置換し、通水後の処理済水のＯＨ−が増加してｐＨ値が上昇していく。ＮａＣｌは、安価で入手容易であり、原水に良く溶けて無色透明であり、イオン交換後も沈殿物を生じない。 After pretreatment for increasing the electrical conductivity of raw water by dissolving NaCl in the raw water, water is passed through a strong alkaline anion exchange resin by a conventional method, whereby Cl − in the raw water is subjected to strong alkaline anion exchange. The OH − (hydroxide ion) electrodeposited on the resin is replaced, and the OH − of the treated water after passing water increases to increase the pH value. NaCl is inexpensive and readily available, dissolves well in raw water, is colorless and transparent, and does not produce a precipitate even after ion exchange.
本発明者は、強アルカリ性アニオン交換樹脂に通水させる時点の原水の電気伝導度と、通水後の処理済水のｐＨ値との関係を調べるための試験を行った。原水として、電気伝導度が０〜２５０μＳ／ｃｍの範囲で様々に異なる地下水（ｐＨ７．２〜７．８）を用意し、各原水１００リットルにＮａＣｌ水溶液の添加量を変えることにより、その電気伝導度を５００μＳ／ｃｍ、１，０００μＳ／ｃｍ、３，０００μＳ／ｃｍ、５，０００μＳ／ｃｍ、８，０００μＳ／ｃｍ、１０，０００μＳ／ｃｍ、１５，０００μＳ／ｃｍ、１８，０００μＳ／ｃｍ、２０，０００μＳ／ｃｍおよび２５，０００μＳ／ｃｍとする予備処理を行った。予備処理後の原水を強アルカリ性アニオン交換樹脂（三菱化学「ダイヤイオン（登録商標）ＳＡ−２０Ａ」）に通水線速度ＬＶ２０ｍ／ｈで通水させ、その処理済水のｐＨを測定した。結果は表２に示す通りであった。 This inventor conducted the test for investigating the relationship between the electrical conductivity of the raw | natural water at the time of passing water through a strong alkaline anion exchange resin, and the pH value of the treated water after water flow. As raw water, various groundwaters (pH 7.2 to 7.8) having electrical conductivity in the range of 0 to 250 μS / cm are prepared, and the electric conductivity is changed by changing the amount of NaCl aqueous solution added to 100 liters of each raw water. The degree is 500 μS / cm, 1,000 μS / cm, 3,000 μS / cm, 5,000 μS / cm, 8,000 μS / cm, 10,000 μS / cm, 15,000 μS / cm, 18,000 μS / cm, 20,000 Pretreatment was performed at 000 μS / cm and 25,000 μS / cm. The raw water after the preliminary treatment was passed through a strongly alkaline anion exchange resin (Mitsubishi Chemical “Diaion (registered trademark) SA-20A”) at a water flow rate of LV 20 m / h, and the pH of the treated water was measured. The results were as shown in Table 2.
この結果から、原水の電気伝導度を上昇させるにつれて処理済水のｐＨを上昇させて強アルカリ化させることができ、電気伝導度を１０，０００μＳ／ｃｍまで上昇させるとｐＨ１２．５の強アルカリ性水を得ることができるが、１５，０００μＳ／ｃｍを超えてさらに電気伝導度を上昇させてもｐＨを上昇させる効果がほぼ頭打ちになることが分かった。また、後述するように、ｐＨ１２．５の強アルカリ性水は、きわめて短時間で錆を除去する能力を発揮することが確認された。したがって、コストや処理効率を考慮すれば、強アルカリ性アニオン交換樹脂に通水させる前に行う予備処理は、原水の電気伝導度を１０，０００〜１５，０００μＳ／ｃｍに上昇させることが好ましい。 From this result, as the electrical conductivity of the raw water is increased, the pH of the treated water can be increased to make it strongly alkaline, and when the electrical conductivity is increased to 10,000 μS / cm, the strongly alkaline water having a pH of 12.5 can be obtained. However, it has been found that the effect of increasing the pH almost reaches its peak even if the electric conductivity is further increased beyond 15,000 μS / cm. Further, as will be described later, it was confirmed that strong alkaline water having a pH of 12.5 exhibits the ability to remove rust in a very short time. Therefore, in consideration of cost and treatment efficiency, it is preferable to increase the electrical conductivity of the raw water to 10,000 to 15,000 μS / cm in the preliminary treatment performed before water is passed through the strongly alkaline anion exchange resin.
通水処理済液の錆除去能力を確認するために、次の試験を行った。すなわち、上記サンプル番号１６の通水処理済液２００ｃｃをビーカーに取り、ここに、錆びた鉄筋１個と、錆びた釘１個を紙やすりで軽く研磨したものを検体として投入したところ、３０〜６０分で錆びた鉄筋および釘の表面がそれぞれ黒色の水酸化鉄に変化し始め、１８０〜３００分経過した時点で鉄筋および釘の表面に全体的に水酸化被膜が形成された。同様の試験を上記サンプル番号１４および１５の通水処理済液についても行ったが、検体の表面が水酸化鉄に変化し始めるまでに５時間以上を要し、ほぼ完全に洗浄するまでに１０時間以上を要した。この結果から、強アルカリ性水として十分な錆除去能力を発揮するためにはｐＨ１２．５以上であることが好ましいことが分かった。 In order to confirm the rust removal capability of the water-treated liquid, the following test was conducted. That is, when 200 cc of the water flow-treated solution of the sample number 16 is taken in a beaker and one rusted reinforcing bar and one rusted nail lightly polished with sandpaper are put as samples, 30 to 30 In 60 minutes, the surfaces of the rusted reinforcing bars and nails started to change to black iron hydroxide, and when 180 to 300 minutes had elapsed, a hydroxide film was formed entirely on the surfaces of the reinforcing bars and nails. The same test was performed for the water-treated solutions of the above sample numbers 14 and 15, but it took 5 hours or more for the surface of the specimen to start to change into iron hydroxide, and 10 for the almost complete washing. It took more than an hour. From this result, it was found that the pH is preferably 12.5 or more in order to exhibit sufficient rust removing ability as strong alkaline water.
上記試験においてはＮａＣｌ水溶液を原水に溶解させることで電気伝導度を増大させる予備処理を行ったが、これに代えて、塩素ガスを原水に溶解させることで電気伝導度を増大させる予備処理を行うことについても試験を行った。すなわち、上記と同様に、電気伝導度が０〜２５０μＳ／ｃｍの範囲で様々に異なる原水（ｐＨ７．２〜７．８の地下水）各１００リットルに塩素ガスを溶解させることにより、原水の電気伝導度を５００μＳ／ｃｍ、１，０００μＳ／ｃｍ、３，０００μＳ／ｃｍ、５，０００μＳ／ｃｍ、８，０００μＳ／ｃｍ、１０，０００μＳ／ｃｍ、１５，０００μＳ／ｃｍ、１８，０００μＳ／ｃｍ、２０，０００μＳ／ｃｍおよび２５，０００μＳ／ｃｍとする予備処理を行った。予備処理後の原水を強アルカリ性アニオン交換樹脂（三菱化学「ダイヤイオン（登録商標）ＳＡ−２０Ａ」）に通水線速度ＬＶ２０ｍ／ｈで通水させ、その処理済水のｐＨを測定したところ、表２と同じ結果が得られた。 In the above test, a pretreatment for increasing the electrical conductivity by dissolving the NaCl aqueous solution in the raw water was performed. Instead, a pretreatment for increasing the electric conductivity by dissolving the chlorine gas in the raw water is performed. This was also tested. That is, similarly to the above, by dissolving chlorine gas in each 100 liters of raw water (ground water having a pH of 7.2 to 7.8) having different electric conductivities in the range of 0 to 250 μS / cm, the electric conduction of the raw water The degree is 500 μS / cm, 1,000 μS / cm, 3,000 μS / cm, 5,000 μS / cm, 8,000 μS / cm, 10,000 μS / cm, 15,000 μS / cm, 18,000 μS / cm, 20,000 Pretreatment was performed at 000 μS / cm and 25,000 μS / cm. The raw water after the preliminary treatment was passed through a strongly alkaline anion exchange resin (Mitsubishi Chemical “Diaion (registered trademark) SA-20A”) at a water passage speed of LV 20 m / h, and the pH of the treated water was measured. The same results as in Table 2 were obtained.
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