JP4251059B2 - Bactericidal electrolyzed water production equipment - Google Patents
Bactericidal electrolyzed water production equipment Download PDFInfo
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- JP4251059B2 JP4251059B2 JP2003365930A JP2003365930A JP4251059B2 JP 4251059 B2 JP4251059 B2 JP 4251059B2 JP 2003365930 A JP2003365930 A JP 2003365930A JP 2003365930 A JP2003365930 A JP 2003365930A JP 4251059 B2 JP4251059 B2 JP 4251059B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 140
- 230000000844 anti-bacterial effect Effects 0.000 title claims description 64
- 238000004519 manufacturing process Methods 0.000 title description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 61
- 239000007864 aqueous solution Substances 0.000 claims description 36
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 34
- 239000000460 chlorine Substances 0.000 claims description 34
- 229910052801 chlorine Inorganic materials 0.000 claims description 34
- 239000011780 sodium chloride Substances 0.000 claims description 32
- 238000005868 electrolysis reaction Methods 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 21
- 230000002378 acidificating effect Effects 0.000 claims description 19
- 239000012528 membrane Substances 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 12
- 235000013373 food additive Nutrition 0.000 description 12
- 239000002778 food additive Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 235000013305 food Nutrition 0.000 description 11
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 10
- 230000001954 sterilising effect Effects 0.000 description 10
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000007865 diluting Methods 0.000 description 8
- -1 hypochlorite ions Chemical class 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000001103 potassium chloride Substances 0.000 description 6
- 235000011164 potassium chloride Nutrition 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000008399 tap water Substances 0.000 description 5
- 235000020679 tap water Nutrition 0.000 description 5
- 235000013311 vegetables Nutrition 0.000 description 5
- 238000005341 cation exchange Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 229920000557 Nafion® Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920001817 Agar Polymers 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 239000008272 agar Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- LLTOPKQGFAAMKH-UHFFFAOYSA-N siderin Chemical compound COC1=CC(=O)OC2=CC(OC)=CC(C)=C21 LLTOPKQGFAAMKH-UHFFFAOYSA-N 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Description
本発明は殺菌性電解水の製造装置に関するもので、更に詳しく述べると、無隔膜電解法と隔膜電解法を組合せて生成される２種類以上の電解水を混合し、希釈することによって、次亜塩素酸を含有した殺菌効果が高い殺菌性電解水を生成させる装置である。 The present invention relates to an apparatus for producing bactericidal electrolyzed water. More specifically, the present invention relates to a hypochlorous by mixing and diluting two or more types of electrolyzed water produced by combining the diaphragm electrolysis method and the membrane electrolysis method. It is an apparatus for producing bactericidal electrolyzed water containing chloric acid and having a high bactericidal effect.
電解水には次亜塩素酸が含まれており、その殺菌効果に着目した電解水の利用が医療分野を始めとして、多くの分野でその用途が検討されている。 Hypochlorous acid is contained in the electrolyzed water, and the use of the electrolyzed water focusing on its bactericidal effect has been studied in many fields including the medical field.
塩化ナトリウム溶液を無隔膜電解槽で電気分解して得られる、アルカリ性電解水は次亜塩素酸ナトリウムを希釈したものと同等であるため、平成11年に厚生労働省により食品添加物として認可された。 Since alkaline electrolyzed water obtained by electrolyzing a sodium chloride solution in a non-diaphragm electrolytic cell is equivalent to a solution obtained by diluting sodium hypochlorite, it was approved as a food additive in 1999 by the Ministry of Health, Labor and Welfare.
一方、次亜塩素酸水溶液の安定性はその溶液のpHに依存し、酸性側では次亜塩素酸は分解して塩素ガスを発生し易く、不安定な状態で存在している。また、アルカリ側では次亜塩素酸イオンとして存在するため、殺菌力が低い状態となっている。中性付近ではほぼ全量が次亜塩素酸分子の状態で存在するため、殺菌力が著しく向上することが知られている。 On the other hand, the stability of hypochlorous acid aqueous solution depends on the pH of the solution. On the acidic side, hypochlorous acid is easily decomposed to generate chlorine gas and exists in an unstable state. Moreover, since it exists as a hypochlorite ion in the alkali side, it is in the state where sterilization power is low. It is known that the sterilizing power is remarkably improved because almost the entire amount exists in the state of hypochlorous acid molecules in the vicinity of neutrality.
ところが、上記の方法で得られる電解水は、pHを精度よくコントロールすることが難しく、ｐH が不安定になり易い。従って、電解水の pH が安定せずアルカリ性が強くなると、次亜塩素酸が次亜塩素酸イオンとして存在し、同濃度の使用であっても、殺菌力が低下するという問題点がある。 However, the electrolyzed water obtained by the above method is difficult to control the pH with high accuracy, and the pH tends to become unstable. Therefore, when the pH of the electrolyzed water is not stabilized and the alkalinity becomes strong, hypochlorous acid exists as hypochlorite ions, and there is a problem that the bactericidal power is reduced even when the same concentration is used.
平成14年にも厚生労働省により、塩化ナトリウム水溶液を隔膜電解槽で電気分解して得られる pH 2.7 以下の強酸性電解水と、塩酸を無隔膜電解槽で電気分解して得られる弱酸性電解水（例えば、特許文献１）が、食品添加物として認可された。 In 2002, by the Ministry of Health, Labor and Welfare, strongly acidic electrolyzed water having a pH of 2.7 or less obtained by electrolyzing a sodium chloride aqueous solution in a diaphragm electrolytic cell and weakly acidic electrolyzed water obtained by electrolyzing hydrochloric acid in a non-diaphragm electrolytic cell. (For example, Patent Document 1) has been approved as a food additive.
しかし強酸性電解水は強酸性であるため pH が低く、塩素ガスを発生し易く不安定であり、金属腐食、塩素臭の発生など問題点が多く残されている。 However, since strongly acidic electrolyzed water is strongly acidic, it has a low pH, is prone to generate chlorine gas, is unstable, and has many problems such as metal corrosion and generation of chlorine odor.
また前述の特許文献１に記載されている方法は、塩酸を用いるため取り扱い上危険性が大きい点に問題がある。 In addition, the method described in Patent Document 1 has a problem in that the use of hydrochloric acid has a high handling risk.
一方、本件出願人が先に出願した電解水生成装置（特許文献2)は、得られる電解水のpHが中性領域であるため、殺菌効果が著しく高い。しかし食品添加物に対応した電解水を安定して生成するには、電流負荷が大きくなり過ぎるため、電極の耐久性に劣る等の問題点がある。また単純に１つの隔膜電解槽で生成する陽極側からの酸性電解水と、陰極側からのアルカリ性電解水を混合希釈するだけでは、pHが6.5 以下にしかならず、pHを調整するため電流値などの諸条件を変更しても、所望の殺菌性電解水を効率よく経済的に生成させることは困難である（例えば、特許文献３）。
本発明は前述の問題点にかんがみ、食品分野に対応したより高い殺菌効果をもつ殺菌性電解水を安定的に生成する装置を提供することにある。 In view of the above-mentioned problems, the present invention is to provide an apparatus for stably generating bactericidal electrolyzed water having a higher bactericidal effect corresponding to the food field.
本発明者等はこれらの問題点を解決する方法について検討した。その結果このような性状を有する電解水を１つの電解工程で安定して製造することは困難である。しかし、隔膜電解法及び無隔膜電解法を組み合わせることにより、これらの工程で得られる２種類以上の電解水を混合し、希釈することによって、食品添加物に対応した殺菌性電解水を効率よく安定的に生成させることができることを見出した。この知見に基づいて、これらの条件について更に検討した結果、本発明に到達した。 The present inventors examined a method for solving these problems. As a result, it is difficult to stably produce electrolyzed water having such properties in one electrolysis process. However, by combining the diaphragm electrolysis method and the non-diaphragm electrolysis method, two or more types of electrolyzed water obtained in these steps are mixed and diluted to efficiently stabilize the bactericidal electrolyzed water corresponding to food additives. It was found that it can be generated automatically. As a result of further investigation on these conditions based on this finding, the present invention has been achieved.
すなわち、原料として濃度 20g/L以上、300g/L以下の塩化ナトリウム及び／または塩化カリウム水溶液を使用し、隔膜電解法及び無隔膜電解法を組合わせて生成される２種類以上の電解水を混合し、希釈することにより、有効塩素濃度が1ppm以上、500ppm以下の殺菌性電解水を製造する装置である。 That is, sodium chloride and / or potassium chloride aqueous solution with a concentration of 20g / L or more and 300g / L or less is used as a raw material, and two or more kinds of electrolyzed water produced by combining the diaphragm electrolysis method and the non-diaphragm electrolysis method are mixed. By diluting, an apparatus for producing bactericidal electrolyzed water having an effective chlorine concentration of 1 ppm or more and 500 ppm or less.
また前述の装置において、２種類以上の電解水の１つが無隔膜電解により生成されたアルカリ性電解水であり、他の電解水が隔膜電解によりその陽極槽で生成された酸性電解水である、殺菌性電解水の製造装置である。 In the above-described apparatus, one of the two or more types of electrolyzed water is alkaline electrolyzed water generated by non-diaphragm electrolysis, and the other electrolyzed water is acidic electrolyzed water generated in the anode tank by diaphragm electrolysis. It is an apparatus for producing electrolyzed water.
更に、２種類以上の電解水の１つが、無隔膜電解により生成されたアルカリ性電解水であり、他の電解水が無隔膜電解により生成された、アルカリ性電解水を更に隔膜電解槽の陽極側に導入して電気分解することによって得られる電解水である。 Furthermore, one of the two or more types of electrolyzed water is alkaline electrolyzed water generated by diaphragm electrolysis, and the other electrolyzed water is generated by non-membrane electrolysis, and the alkaline electrolyzed water is further added to the anode side of the diaphragm electrolyzer. Electrolyzed water obtained by introduction and electrolysis .
また更に、pHが 7.5以上、9.0 以下であり、有効塩素濃度が１ppm 以上、200ppm以下の殺菌性電解水を製造する、請求項記載の殺菌性電解水の製造装置も本発明に含まれている。以下、本発明について詳しく説明する。 Furthermore, pH is 7.5 or more, 9.0 or less, are included in the effective chlorine concentration is 1ppm or more, to produce the following sterilizing electrolyzed water 200 ppm, but the present invention apparatus for producing sterilizing electrolyzed water of claim . The present invention will be described in detail below.
ここで、電解水及び殺菌性電解水とは、塩化ナトリウム及び／または塩化カリウム水溶液を、電気分解して得られた次亜塩素酸を含む水溶液で、殺菌作用または除菌作用を有する水溶液を指している。また便宜上、電解槽で電気分解して得られる溶液を電解水、それらの複数の電解水を混合して最終的に装置より得られた水溶液を、殺菌性電解水と呼び分けることとする。また、本発明の殺菌性電解水はナトリウム及び／またはカリウムの塩化物の水溶液のみから容易に得られることが、本発明の最も大きな特徴の一つである。さらに塩化ナトリウムあるいは、塩化カリウムあるいは、それらの混合物のいずれの水溶液を用いても、同様な効果を示す殺菌性電解水が得られるため、以下、塩化ナトリウム水溶液を代表例として用いて説明する。 Here, the electrolyzed water and the bactericidal electrolyzed water are aqueous solutions containing hypochlorous acid obtained by electrolysis of sodium chloride and / or potassium chloride aqueous solution, and indicate an aqueous solution having a bactericidal action or a sterilizing action. ing. For convenience, a solution obtained by electrolysis in an electrolytic bath is referred to as electrolyzed water, and an aqueous solution finally obtained from the apparatus by mixing a plurality of electrolyzed water is referred to as bactericidal electrolyzed water. One of the most significant features of the present invention is that the bactericidal electrolyzed water of the present invention can be easily obtained only from an aqueous solution of sodium and / or potassium chloride. Furthermore, since any bactericidal electrolyzed water having the same effect can be obtained by using any aqueous solution of sodium chloride, potassium chloride, or a mixture thereof, the following description will be given using a sodium chloride aqueous solution as a representative example.
本発明における殺菌性電解水の生成フローの一例を図１に示す。原料の塩化ナトリウム水溶液は、電解槽の内部に隔膜が設けられていない電解槽、すなわち無隔膜電解槽及び、電解槽の内部に隔膜が設けられている電解槽、すなわち隔膜電解槽に供給され電気分解される。 An example of the flow of generation of bactericidal electrolyzed water in the present invention is shown in FIG . The sodium chloride aqueous solution as a raw material is supplied to an electrolytic cell in which no diaphragm is provided inside the electrolytic cell, that is, a non-diaphragm electrolytic cell, and an electrolytic cell in which a diaphragm is provided in the electrolytic cell, that is, a diaphragm electrolytic cell. Disassembled.
無隔膜電解槽により生成される電解水と、隔膜電解槽の陽極側より生成される電解水は、原料の水溶液の種類、供給液量、また、それぞれの槽に印加される電流、電圧、更にはそれぞれの電解水の混合比率、上水での希釈等を使用目的に合わせて適宜、調整することにより、所望の殺菌性電解水を製造することができる。この殺菌性電解水のpHを
7.5以上になる様に調節すれば、食品添加物に適応した電解水を得ることができる。
The electrolyzed water generated by the membrane electrolyzer and the electrolyzed water generated from the anode side of the diaphragm electrolyzer are the type of aqueous solution of the raw material, the amount of supplied liquid, and the current, voltage applied to each tank, Can appropriately produce the desired bactericidal electrolyzed water by adjusting the mixing ratio of each electrolyzed water, dilution with clean water, etc. according to the purpose of use. PH of this bactericidal electrolyzed water
Be adjusted so as to be 7.5 or more, it is possible to obtain electrolytic water was adaptation to food additives.
隔膜電解槽の内部に設けられる隔膜としては、一般に市販されている各種の陽イオン交換膜が使用可能であるが、特に塩素に対して強い耐性を有するフッ素系陽イオン交換膜の使用が好ましく、隔膜寿命の延長、電気抵抗の低減などの効果が得られる。この様な隔膜としては、例えばデュポン社製「ナフィオン115 」、「ナフィオン424 」、「ナフィオン450 」等が好ましい。 As the diaphragm provided inside the diaphragm electrolytic cell, various commercially available cation exchange membranes can be used, but it is particularly preferable to use a fluorine-based cation exchange membrane having strong resistance to chlorine, Effects such as extension of diaphragm life and reduction of electrical resistance can be obtained. As such a diaphragm, for example, “Nafion 115”, “Nafion 424”, “Nafion 450” manufactured by DuPont and the like are preferable.
原料として使用される塩化ナトリウム水溶液の濃度は、殺菌性電解水の使用目的に応じて調整されるが、本発明では、20〜300 g/L が好ましい。20g/L 以下では電気抵抗が上昇して電流効率が低下するため、陰極から塩素ガスが発生すると共に、酸素も発生して電極を消耗させる原因となるために好ましくない。20g/L 以上であれば、酸素が発生しないため電流効率が安定して、電気量に対応した一定量の塩素が発生する。一方、300g/L以上では、飽和状態に近くなるため、季節による温度変化などにより、原料の塩化ナトリウムが結晶として水溶液中に析出し、配管などの詰まりの原因になるおそれがある。これらの理由によって、塩化ナトリウム水溶液の濃度が20〜300 g/L の範囲内であれば、電解における塩素の電流効率も高く電力をより有効に使用できる。更に、使用先で食塩を調整する際に生じる濃度のずれ、コスト面から考慮して、原料の塩化ナトリウム水溶液の濃度は、50g/L 以上であり、100g/L以下がより好ましい。 The concentration of the sodium chloride aqueous solution used as a raw material is adjusted according to the purpose of use of the bactericidal electrolyzed water. In the present invention, 20 to 300 g / L is preferable. If it is 20 g / L or less, the electric resistance is increased and the current efficiency is lowered, so that chlorine gas is generated from the cathode and oxygen is also generated and the electrode is consumed, which is not preferable. If it is 20 g / L or more, oxygen is not generated, the current efficiency is stable, and a certain amount of chlorine corresponding to the amount of electricity is generated. On the other hand, at 300 g / L or more, since it is close to a saturated state, sodium chloride as a raw material may precipitate in the aqueous solution as crystals due to seasonal temperature changes, etc., which may cause clogging of piping and the like. For these reasons, if the concentration of the sodium chloride aqueous solution is in the range of 20 to 300 g / L, the current efficiency of chlorine in electrolysis is high and electric power can be used more effectively. Furthermore, in consideration of the concentration shift that occurs when adjusting the salt at the point of use and cost, the concentration of the sodium chloride aqueous solution as the raw material is 50 g / L or more, and more preferably 100 g / L or less.
電解工程においてしばしば無隔膜電解槽及び隔膜電解槽の陰極に水酸化カルシウムが析出するため、電解電流が低下して安定した次亜塩素酸溶液の生成が阻害される場合がある。このため、原料の塩化ナトリウム水溶液を調整する場合、イオン交換水のみで塩化ナトリウムを溶解すれば、水酸化カルシウムが析出するおそれがないため好ましい。 In the electrolysis process, calcium hydroxide is often deposited on the cathodes of the non-diaphragm electrolyzer and the electrolyzer, so that the electrolysis current is lowered and the production of a stable hypochlorous acid solution may be hindered. For this reason, when adjusting the sodium chloride aqueous solution as a raw material, it is preferable to dissolve sodium chloride only with ion-exchanged water because there is no fear of precipitation of calcium hydroxide.
殺菌性電解水の有効塩素濃度は、使用目的に応じて調整されるので、特に限定しないが、１ppm 以上であり、500ppm以下が好ましい。有効塩素濃度が１ppm 以下になると殺菌作用がやや不十分となる。また500ppm以上になると、塩素の残留性や臭気、腐食などの問題が発生するおそれがあるため好ましくない。更には、食品用途では200ppm以上になると、食材への残留性の問題が懸念される点も考慮する必要があるため好ましくない。通常に使用する場合には、有効塩素濃度は30〜50ppm 程度あれば充分であるが、食材に付着した汚れや有機物との反応で劣化する可能性も考慮すれば、殺菌性電解水の有効塩素濃度は１ppm 以上であり、200ppm以下が好ましい。 The effective chlorine concentration of the bactericidal electrolyzed water is adjusted according to the purpose of use, and is not particularly limited, but is 1 ppm or more, preferably 500 ppm or less. When the effective chlorine concentration is 1 ppm or less, the bactericidal action is slightly insufficient. On the other hand, if it exceeds 500 ppm, problems such as residual chlorine, odor, and corrosion may occur. Furthermore, when it is 200 ppm or more for food applications, it is necessary to consider the problem of persistence in food materials, which is not preferable. For normal use, an effective chlorine concentration of about 30-50 ppm is sufficient, but considering the possibility of deterioration due to reaction with dirt and organic substances adhering to foodstuffs, the effective chlorine concentration of bactericidal electrolyzed water The concentration is 1 ppm or more, preferably 200 ppm or less.
殺菌性電解水のpHは、用途に応じて運転条件を変更することで調整できるので特に限定されない。しかし、次亜塩素酸水溶液はアルカリ側では次亜塩素酸イオンとして存在し、殺菌力が低下するため、pHをなるべく中性側に調節するのが好ましい。25℃、pH 7.5の状態では、次亜塩素酸と次亜塩素酸イオンが約50％ずつの割合で存在し、pHが10以上になるとほぼ全量が次亜塩素酸イオンになることが知られている。従って、食品添加物対応の殺菌性電解水を得るために、pHを7.5 以上に調整するが、より高い殺菌効果を得るためには、殺菌性電解水のpHは 7.5以上であり、9.0 以下が好ましい。 The pH of the bactericidal electrolyzed water is not particularly limited because it can be adjusted by changing the operating conditions according to the application. However, since the hypochlorous acid aqueous solution exists as hypochlorite ions on the alkali side and the sterilizing power is reduced, it is preferable to adjust the pH to the neutral side as much as possible. It is known that hypochlorite and hypochlorite ions are present in a ratio of about 50% at 25 ° C and pH 7.5, and almost all of them become hypochlorite ions when the pH exceeds 10. ing. Therefore, in order to obtain bactericidal electrolyzed water for food additives, the pH is adjusted to 7.5 or higher, but in order to obtain a higher bactericidal effect, the pH of bactericidal electrolyzed water is 7.5 or higher, and 9.0 or lower. preferable.
またpHが 7.5以上であり、9.0 以下である殺菌性電解水は、金属に対する腐食性が水道水と同等か少し高い程度であり、使用時に塩素ガスの発生は認められないため、食材を洗浄する際にシンクなどへの影響が少なく使用に適している。また作業者の皮膚への刺激性が少なく、塩素ガスの臭気を感じることも殆どないため、作業環境、人体への影響が殆どない。これらの点からも食品添加物としてより高い殺菌力をもち、作業環境・人体に影響が少ない殺菌性電解水、即ちpHが 7.5以上であり、9.0 以下である殺菌性電解水が好ましい。 Bactericidal electrolyzed water with a pH of 7.5 or more and 9.0 or less is equivalent to or slightly higher than corrosiveness to tap water, and no chlorine gas is generated during use. It is suitable for use with little influence on the sink. In addition, there is little irritation to the skin of the worker and there is almost no odor of chlorine gas, so there is almost no influence on the work environment and the human body. In view of these points, bactericidal electrolyzed water having higher sterilizing power as a food additive and having less influence on the working environment and the human body, that is, bactericidal electrolyzed water having a pH of 7.5 or higher and 9.0 or lower is preferable.
原料の塩化ナトリウム水溶液を無隔膜電解槽で電気分解すると、陰極側には水酸化ナトリウムが生成され、また陽極側では塩素ガスが発生してアルカリ性電解水が得られる。また塩化ナトリウム水溶液を隔膜電解槽で電気分解すると、陽極側で塩素ガスが発生して酸性電解水が得られる。この際、導電性水溶液を隔膜電解槽の陰極側に供給する必要がある。この溶液は特に限定しないが、本発明では操作利便性などの観点から、原料の塩化ナトリウム水溶液の一部を隔膜電解槽の陰極側に直接供給し、適宜排水する方式を採用することが出来る。 When the sodium chloride aqueous solution as a raw material is electrolyzed in a diaphragm electrolyzer, sodium hydroxide is generated on the cathode side, and chlorine gas is generated on the anode side to obtain alkaline electrolyzed water. Moreover, when an aqueous sodium chloride solution is electrolyzed in a diaphragm electrolytic cell, chlorine gas is generated on the anode side, and acidic electrolyzed water is obtained. At this time, it is necessary to supply a conductive aqueous solution to the cathode side of the diaphragm electrolytic cell. Although this solution is not particularly limited, in the present invention, from the viewpoint of operational convenience, a method of supplying a part of the raw material sodium chloride aqueous solution directly to the cathode side of the diaphragm electrolytic cell and appropriately draining it can be adopted.
このように無隔膜電解槽でアルカリ性電解水を生成し、隔膜電解槽の陽極側において酸性電解水を生成して、その２つの電解水の生成比率を適宜調節して、混合・希釈することによって殺菌性電解水のpHや有効塩素濃度を精度よく調整することが可能となる。 In this way, by generating alkaline electrolyzed water in the non-diaphragm electrolyzer, generating acidic electrolyzed water on the anode side of the electrolyzer, and appropriately adjusting the ratio of the two electrolyzed water, mixing and diluting It is possible to accurately adjust the pH and effective chlorine concentration of bactericidal electrolyzed water.
本発明における殺菌性電解水の製造装置の生成フローを図１に示す。原料の塩化ナトリウム水溶液は、まず電解槽の内部に隔膜が設けられていない電解槽、すなわち、無隔膜電解槽に供給され電気分解される。 The generation flow of the manufacturing apparatus for sterilizing electrolyzed water in the present invention is shown in FIG. The raw material sodium chloride aqueous solution is first supplied and electrolyzed in an electrolytic cell in which no diaphragm is provided inside the electrolytic cell, that is, a non-diaphragm electrolytic cell.
無隔膜電解槽で得られたpH８以上、有効塩素濃度が 1000ppm以上で多量の次亜塩素酸イオンを含むアルカリ性電解水は、隔膜電解槽の陽極側に導入され、更に電気分解される。このアルカリ性電解水は、陽極側での電解によって水酸イオンが減少して水素イオンが生成するため、pHが低下して、pH６以下、有効塩素濃度 1000ppm以上である酸性電解水となる。ここでアルカリ性電解水に含まれていた次亜塩素酸イオン及び、陽極側で発生した塩素ガスはpHが強アルカリ性から酸性に変化することにより、殆どが次亜塩素酸分子か溶存塩素ガスとなるため高い殺菌力を示すようになる。 Alkaline electrolyzed water containing a large amount of hypochlorite ions having a pH of 8 or more and an effective chlorine concentration of 1000 ppm or more obtained in a non-diaphragm electrolyzer is introduced to the anode side of the electrolyzer and further electrolyzed. The alkaline electrolyzed water is reduced in pH by electrolysis on the anode side to produce hydrogen ions, so that the pH is lowered to become acidic electrolyzed water having a pH of 6 or less and an effective chlorine concentration of 1000 ppm or more. Here, the hypochlorite ions contained in the alkaline electrolyzed water and the chlorine gas generated on the anode side are mostly hypochlorous acid molecules or dissolved chlorine gas as the pH changes from strong alkaline to acidic. Therefore, it comes to show high sterilizing power.
図１において、原料の塩化ナトリウム水溶液を、別の無隔膜電解槽で電気分解したpH８以上、有効塩素濃度が 1000ppm以上のアルカリ性電解水を、前記の酸性電解水と混合し希釈することによって、殺菌性電解水を得ることも可能である。 In FIG. 1, alkaline electrolyzed water having a pH of 8 or more and an effective chlorine concentration of 1000 ppm or more obtained by electrolyzing a sodium chloride aqueous solution as a raw material in another non-diaphragm electrolyzer is mixed with the above-mentioned acidic electrolyzed water to be sterilized. Electrolyzed water can also be obtained.
このように無隔膜電解槽で得られたアルカリ性電解水を、更に隔膜電解槽で電気分解するのは、隔膜電解槽の陽極側にアルカリ性電解水を導入することによって、槽内全体をアルカリ性とし、陽極側で発生する塩素ガスの吸収を促進させる利点が得られるためであり、小型の電解槽で大量の電解水を得ることができる。 The alkaline electrolyzed water thus obtained in the non-diaphragm electrolyzer is further electrolyzed in the diaphragm electrolyzer by introducing alkaline electrolyzed water to the anode side of the diaphragm electrolyzer, thereby making the entire tank alkaline, This is because an advantage of promoting absorption of chlorine gas generated on the anode side is obtained, and a large amount of electrolyzed water can be obtained in a small electrolytic cell.
また、図１の装置では電解槽の数が多くなるが、無隔膜電解槽と別の無隔膜電解槽の電流値を変えることが可能になる。そのため、無隔膜電解槽に高い電流を流すことによって、隔膜電解槽へ導入する前の電解水のアルカリ度を上昇させることができる。それに起因して、隔膜電解槽の陽極側で発生した塩素ガスを吸収させ易くする利点が生じるため、より好ましい。更には使用目的、使用量、設置場所等のインフラに応じて電解槽数、生成させる電解水の性状を調整することが可能となる。 Moreover , although the number of electrolyzers increases in the apparatus of FIG. 1 , it becomes possible to change the electric current value of a non-diaphragm electrolyzer and another non-diaphragm electrolyzer. Therefore, the alkalinity of the electrolyzed water before introduce | transducing into a diaphragm electrolytic cell can be raised by sending a high electric current through a non-diaphragm electrolytic cell. This is more preferable because it has an advantage of easily absorbing chlorine gas generated on the anode side of the diaphragm electrolytic cell. Furthermore, it is possible to adjust the number of electrolytic cells and the properties of the electrolyzed water to be generated according to the infrastructure such as the purpose of use, the amount used, and the installation location.
更に、通常は廃棄される隔膜電解槽の陰極側で生成したアルカリ性電解水の一部をpH調整剤として有効に活用することが可能である。これにより、無隔膜電解槽で生成されるアルカリ性電解水の量が少なくても、効果が高い殺菌性電解水を得ることができ、また排水量やコストの削減に繋がるメリットがある。 Furthermore , it is possible to effectively utilize a part of the alkaline electrolyzed water generated on the cathode side of the diaphragm electrolytic cell that is usually discarded as a pH adjuster. Thus, even with a small amount of alkaline electrolyzed water produced in diaphragm-free electrolytic cell, the effect can be obtained with high bactericidal electrolyzed water, also there is a merit that leads to reduction of the wastewater and costs.
しかしながら、先に特許文献３に述べられているように、単純に１つの隔膜電解槽で生成する陽極側からの酸性電解水と、陰極側からのアルカリ性電解水を混合希釈するだけでは、pHが6.5 以下の電解水しか得られない。pHを調整をするため電流値などの諸条件を変更しても、所望の殺菌性電解水を効率よく経済的に生成することは困難である。すなわち、本発明では無隔膜電解槽で生成された、高濃度の次亜塩素酸を含有する電解水を活用することが必須であり、これにより設備の小型化が達成でき経済性も高めることができる。 However, as previously described in Patent Document 3, simply by mixing and diluting acidic electrolyzed water from the anode side and alkaline electrolyzed water from the cathode side, which is produced in one diaphragm electrolytic cell, the pH is reduced. Only electrolyzed water of 6.5 or less can be obtained. Even if various conditions such as a current value are changed in order to adjust pH, it is difficult to efficiently and economically generate desired bactericidal electrolyzed water. In other words, in the present invention, it is essential to utilize electrolyzed water containing high concentration hypochlorous acid produced in a diaphragmless electrolytic cell, which can achieve downsizing of equipment and increase economic efficiency. it can.
本発明の殺菌性電解水を得るためには、原料としてナトリウム及び／またはカリウムの塩化物の水溶液を用いるのみであり、また簡単な操作によって高い殺菌性を有する電解水が連続的に供給できる。このため医療分野をはじめ調理場、研究施設、学校等種々な分野での利用が可能である。更にpHを 7.5〜9.0 になるように調整した電解水は、食品添加物に適合する殺菌性電解水であるため、食材を直接洗浄することが可能になり食品関連分野での利用が可能となる。 In order to obtain the bactericidal electrolyzed water of the present invention, only an aqueous solution of sodium and / or potassium chloride is used as a raw material, and electrolyzed water having high bactericidal properties can be continuously supplied by a simple operation. Therefore, it can be used in various fields such as cooking fields, research facilities, schools, etc. in the medical field. Furthermore, since the electrolyzed water adjusted to have a pH of 7.5 to 9.0 is a bactericidal electrolyzed water that is compatible with food additives, it is possible to directly wash the food and use it in food-related fields. .
本発明の殺菌性電解水はナトリウム及び/ またはカリウムの塩化物の水溶液のみから、無隔膜電解槽及び隔膜電解槽を組み合わせた電解工程によって容易に得ることができる。本発明の殺菌性電解水の製造装置によれば、使用目的に応じて設定された濃度及びpHを有する殺菌性電解水を、高精度且つ安定的に製造することが可能である。このため常に高い殺菌効果を有する殺菌性電解水を安定して供給することができる。 The bactericidal electrolyzed water of the present invention can be easily obtained from only an aqueous solution of sodium and / or potassium chloride by an electrolysis process in which a diaphragm electrolyzer and a diaphragm electrolyzer are combined. According to the apparatus for producing bactericidal electrolyzed water of the present invention, it is possible to produce bactericidal electrolyzed water having a concentration and pH set according to the purpose of use with high accuracy and stability. For this reason, the bactericidal electrolyzed water which always has a high bactericidal effect can be supplied stably.
この様にして調製された殺菌性電解水は、より高い殺菌効果を有するため食品添加物に適用可能な殺菌性電解水として、食材の洗浄用に適している。また、この殺菌性電解水は長期間保存しても殺菌性が低下せず保存性にも優れており、塩素ガスの臭気も殆どないため、種々な用途に適用可能である。更に本発明は小規模な装置から大型のシステムに組み込まれた装置としても適用可能である。従って、病院や個人経営の小さな厨房から、大規模な食品メーカーの食品加工工場に至るまで、様々な食品分野で利用が可能である。 The bactericidal electrolyzed water prepared in this manner has a higher bactericidal effect and is suitable for washing foods as bactericidal electrolyzed water applicable to food additives. Further, even if this bactericidal electrolyzed water is stored for a long period of time, the bactericidal property does not deteriorate and the storage property is excellent, and there is almost no odor of chlorine gas, so that it can be applied to various uses. Furthermore, the present invention can be applied as a device incorporated in a large system from a small device. Therefore, it can be used in various food fields, from hospitals and small kitchens operated by individuals to food processing factories of large food manufacturers.
以下、実施例を挙げて図面によって本発明を具体的に説明する。 Hereinafter, the present invention will be specifically described with reference to the accompanying drawings.
（実施例１〜３）
本発明の殺菌性電解水の生成フローを図１に示す。原料の塩化ナトリウムを濃度100g/Lに調整した水溶液は、貯蔵タンク１より定量ポンプ２によって10ml/minで無隔膜電解槽５に供給され、配管19によって取り出された電解水は、更に隔膜電解槽６の陽極側に導入される。隔膜電解槽の陽極12と陰極13の間には隔膜として陽イオン交換膜７が設けられている。また隔膜電解槽の陰極側には、原料の塩化ナトリウム水溶液が、貯蔵タンク１より定量ポンプ４によって10ml/minで供給される。
(Examples 1 to 3 )
The generation flow of the sterilizing electrolyzed water of the present invention shown in FIG. An aqueous solution prepared by adjusting the concentration of sodium chloride as a raw material to a concentration of 100 g / L is supplied from the storage tank 1 to the non-diaphragm electrolyzer 5 by a metering pump 2 at a rate of 10 ml / min. 6 is introduced on the anode side. Between the anode 12 and the cathode 13 of the diaphragm electrolytic cell, a cation exchange membrane 7 is provided as a diaphragm. Further, a sodium chloride aqueous solution as a raw material is supplied from the storage tank 1 by the metering pump 4 at a rate of 10 ml / min to the cathode side of the diaphragm electrolytic cell.
この例では、直流電源装置８より無隔膜電解槽、隔膜電解槽共に４A の電流を流して電気分解させた。この時、無隔膜電解槽において生成された電解水はpHが13、有効塩素濃度が 8000ppmのアルカリ性電解水であり、このアルカリ性電解水を更に隔膜電解槽の陽極側に導入して生成された電解水はpHが４、有効塩素濃度が16000ppmの酸性電解水であった。 In this example, the DC power supply 8 was electrolyzed by passing a current of 4 A in both the non-diaphragm electrolytic cell and the diaphragm electrolytic cell. At this time, the electrolyzed water generated in the non-diaphragm electrolyzer is alkaline electrolyzed water having a pH of 13 and an effective chlorine concentration of 8000 ppm, and the electrolyzed water generated by introducing this alkaline electrolyzed water further to the anode side of the diaphragm electrolyzer. The water was acidic electrolyzed water having a pH of 4 and an effective chlorine concentration of 16000 ppm.
また原料の濃度100g/Lの塩化ナトリウム水溶液を、貯蔵タンク１より定量ポンプ20によって15ml/minで無隔膜電解槽′21に供給し、10A の電流を流して電気分解させた。無隔膜電解槽′21で生成された電解水は、pHが13、有効塩素濃度14000ppmとなり、配管24によって取り出される。 A sodium chloride aqueous solution having a raw material concentration of 100 g / L was supplied from the storage tank 1 to the diaphragm electrolyzer '21 by a metering pump 20 at 15 ml / min, and electrolyzed by flowing a current of 10A. The electrolyzed water produced in the non-diaphragm electrolyzer '21 has a pH of 13 and an effective chlorine concentration of 14000 ppm, and is taken out by the pipe 24.
前述の隔膜電解槽６の陽極側から配管15によって取り出された酸性電解水と、無隔膜電解槽′21より配管24によって取り出されたアルカリ性電解水は、水道水配管17より供給された水10リットル/minと混合・希釈されてpHが８、有効塩素濃度 30ppmの殺菌性電解水（実施例17）が調整された。 The acidic electrolyzed water taken out from the anode side of the diaphragm electrolyzer 6 by the pipe 15 and the alkaline electrolyzed water taken out from the non-diaphragm electrolyzer '21 by the pipe 24 are 10 liters of water supplied from the tap water pipe 17. Bactericidal electrolyzed water (Example 17) having a pH of 8 and an effective chlorine concentration of 30 ppm was prepared by mixing and diluting with / min.
更にこのフローにおいても、500 時間の連続運転を行ったところ、無隔膜電解槽、無隔膜電解槽′及び隔膜電解槽の電解電流は、何れも安定した状態に保持された。また、装置から出水された殺菌性電解水もpHが８、有効塩素濃度 30ppmで安定した品質を保持されていた。 Further, in this flow, when the continuous operation was performed for 500 hours, the electrolysis currents of the diaphragm electrolyzer, the diaphragm electrolyzer ′, and the diaphragm electrolyzer were all kept stable. In addition, the bactericidal electrolyzed water discharged from the apparatus maintained a stable quality at a pH of 8 and an effective chlorine concentration of 30 ppm.
図１に示した電解装置において、原料の塩化ナトリウムをイオン交換水で希釈して水溶液の濃度を30g/L 及び300g/Lに調整した（実施例２，３）。原料の濃度を変えた以外は実施例１と同様にして、電気分解を行い殺菌性電解水を調整した。得られた殺菌性電解水の有効塩素濃度とpHを測定した。その結果を表１に示す。その結果、原料溶液の塩類濃度が20
〜30g/Ｌの範囲であれば、電解における塩素の電流効率が一定となり、一定量の塩素が発生するため、原料溶液の濃度による有効塩素濃度とpHの変化は認められないことが分かる。
In the electrolysis apparatus shown in FIG. 1 , the raw material sodium chloride was diluted with ion-exchanged water to adjust the concentration of the aqueous solution to 30 g / L and 300 g / L (Examples 2 and 3 ). Except for changing the concentration of the raw material, electrolysis was performed in the same manner as in Example 1 to prepare bactericidal electrolyzed water. The effective chlorine concentration and pH of the obtained bactericidal electrolyzed water were measured. The results are shown in Table 1 . As a result, the salt concentration of the raw material solution is 20
If it is in the range of ˜30 g / L, the current efficiency of chlorine in electrolysis becomes constant and a certain amount of chlorine is generated, so that it can be seen that changes in effective chlorine concentration and pH due to the concentration of the raw material solution are not recognized.
（比較例１）
塩化ナトリウム水溶液の濃度を10g/L とした場合以外は実施例１と同様にして殺菌性電解水を得た。その結果、濃度が10g/L の塩化ナトリウム水溶液を用いて得られた電解水は電気抵抗が上昇して電流効率が低下するため、有効塩素濃度が20 ppm と低下していた。このような条件で500
時間の連続運転を行った結果、300 時間を経過した付近から徐々に有効塩素濃度が低下して発熱が起こり、最後には塩素が発生しない状態になった。連続運転終了後、電極の状態を確認したところ、電極が使用不可能な状態まで劣化していたことが分かった。
(Comparative Example 1 )
Bactericidal electrolyzed water was obtained in the same manner as in Example 1 except that the concentration of the sodium chloride aqueous solution was 10 g / L. As a result, the electrolyzed water obtained using a sodium chloride aqueous solution with a concentration of 10 g / L had an increase in electrical resistance and a decrease in current efficiency, so that the effective chlorine concentration decreased to 20 ppm. 500 under these conditions
As a result of continuous operation over a period of time, the effective chlorine concentration gradually decreased from around 300 hours, and heat was generated. Finally, no chlorine was generated. When the state of the electrode was checked after the end of continuous operation, it was found that the electrode had deteriorated to an unusable state.
（実施例４，５、比較例２）
図１に示した電解装置において、原料の塩化ナトリウムをイオン交換水で希釈した濃度100g/Lの水溶液を、無隔膜電解槽及び隔膜電解槽に供給し、それぞれの電解槽の電解条件を変化させて電気分解を行い、水道水10リットル/minを加えて希釈・混合し、有効塩素濃度が 30 ppmでpHが９付近である殺菌性電解水（実施例４）を調整した。また電解条件を変更して、pH８付近の殺菌性電解水（実施例５)
を出水し、これらの殺菌性電解水を用いて、野菜の洗浄試験を行った結果を表２に示す。この結果よりpHが 7.5以上であり、9.0 以下であれば、洗浄前後で明らかに殺菌性が認められることがわかる。殺菌効果は、洗浄前後で野菜表面に付着しているバクテリアの培養試験におけるコロニー数によって比較した。バクテリア培養試験は寒天培地［（株）日研生物医学研究所製「パームスタンプチェックＬ(PSC-L)」〕を使用して、同一の野菜を水洗の前後に寒天培地に密着させた後、培地を恒温器内で
37℃で48時間培養し、発生したコロニー数をコロニーカウンターで計数した。
(Examples 4 and 5 and Comparative Example 2 )
In the electrolysis apparatus shown in FIG. 1 , an aqueous solution having a concentration of 100 g / L obtained by diluting sodium chloride as a raw material with ion-exchanged water is supplied to a non-diaphragm electrolytic cell and a diaphragm electrolytic cell, and the electrolysis conditions of each electrolytic cell are changed. Electrolysis was performed, and 10 liters / min of tap water was added for dilution and mixing to prepare bactericidal electrolyzed water (Example 4 ) having an effective chlorine concentration of 30 ppm and a pH of around 9. In addition, the electrolysis conditions were changed so that the bactericidal electrolyzed water around pH 8 (Example 5 )
And flood and using these biocidal electrolytic water, Table 2 shows the results of cleaning tests of vegetables. From this result, it can be seen that if the pH is 7.5 or more and 9.0 or less, bactericidal properties are clearly observed before and after washing. The bactericidal effect was compared by the number of colonies in the culture test of bacteria attached to the vegetable surface before and after washing. The bacterial culture test was performed using an agar medium (“Palm Stamp Check L (PSC-L)” manufactured by Nikken Biomedical Research Institute Co., Ltd.), and the same vegetables were adhered to the agar medium before and after washing with water. Medium in a thermostat
After culturing at 37 ° C. for 48 hours, the number of colonies generated was counted with a colony counter.
（比較例２）
食品添加物として一般的に使用されている次亜塩素酸ナトリウム溶液を純水で希釈して有効塩素濃度 30ppmに調整した（比較例２）。この溶液のpHは10.3であった。この溶液について野菜の洗浄試験を行い、その結果を表２に示した。その結果、pHがアルカリ領域になると、殺菌効果が低下することが分かる。
(Comparative Example 2 )
A sodium hypochlorite solution generally used as a food additive was diluted with pure water to adjust the effective chlorine concentration to 30 ppm (Comparative Example 2 ). The pH of this solution was 10.3. This was washed test vegetables for a solution, and the results are shown in Table 2. As a result, it can be seen that when the pH is in the alkaline range, the bactericidal effect decreases.
（比較例３）
隔膜電解槽に濃度100g/Lの塩化ナトリウム水溶液を定量ポンプによって、10ml/minで供給させた。直流電源装置より隔膜電解槽に16A の電流を流すことにより生成した、陽極側からの酸性電解水と陰極側からのアルカリ性電解水は、水道水10リットル/minと希釈混合されて、pH６、有効塩素濃度30 ppm
の殺菌性電解水が調整された。しかし、ここで、塩化ナトリウム水溶液の濃度、供給流量及び隔膜電解槽に印加する電流値などの電解条件を変化させて、pHが7.5 以上の食品添加物に対応した殺菌性電解水を得ようと試みたが、pHが７以上の殺菌性電解水は得られなかった。この結果より、単純に１つの隔膜電解槽で生成する陽極側からの酸性電解水と、陰極側からのアルカリ性電解水を混合するだけでは、所望するpHの殺菌性電解水が得られないことがわかった。
(Comparative Example 3 )
A sodium chloride aqueous solution having a concentration of 100 g / L was supplied to the diaphragm electrolytic cell by a metering pump at 10 ml / min. The acidic electrolyzed water from the anode side and the alkaline electrolyzed water from the cathode side, generated by flowing a current of 16A from the DC power supply device to the diaphragm electrolyzer, are diluted and mixed with 10 liters / min of tap water, pH 6, effective Chlorine concentration 30 ppm
The bactericidal electrolyzed water was adjusted. However, by changing the electrolysis conditions such as the concentration of sodium chloride aqueous solution, the supply flow rate, and the current value applied to the diaphragm electrolyzer, an attempt was made to obtain bactericidal electrolyzed water corresponding to food additives having a pH of 7.5 or higher. Although it tried, the bactericidal electrolyzed water whose pH was 7 or more was not obtained. From this result, it is not possible to obtain bactericidal electrolyzed water having a desired pH simply by mixing acidic electrolyzed water from the anode side produced in one diaphragm electrolyzer and alkaline electrolyzed water from the cathode side. all right.
塩化ナトリウム水溶液を隔膜電解槽で電気分解して得られる、 pH 2.7 以下の強酸性電解水と塩酸を無隔膜電解槽で電気分解して得られる弱酸性電解水が、厚生労働省によって食品添加物として認可された。このため、今後特に中性の殺菌性電解水は野菜その他食品の殺菌剤として、食品工業の分野で広く使用される可能性が大きいと考えられる。 Strong acid electrolyzed water of pH 2.7 or less obtained by electrolyzing a sodium chloride aqueous solution in a diaphragm electrolyzer and weakly acidic electrolyzed water obtained by electrolyzing hydrochloric acid in a non-diaphragm electrolyzer are used as food additives by the Ministry of Health, Labor and Welfare. It was authorized. For this reason, it is thought that neutral neutral bactericidal electrolyzed water is likely to be widely used in the field of food industry as a bactericidal agent for vegetables and other foods.
1 貯蔵タンク
2 無隔膜電解槽への定量ポンプ
3 隔膜電解槽陽極側への定量ポンプ
4 隔膜電解槽陰極側への定量ポンプ
5 無隔膜電解槽
6 隔膜電解槽
7 陽イオン交換膜（隔膜）
8 ，9 電解用直流電源装置
10，12 陽極
11，13 陰極
15 隔膜電解槽の陽極側の取り出し液の配管
16 排水管
17 水道水配管
18 電解水取出口
19 無隔膜電解槽の取り出し液を隔膜電解槽へ送る配管
20 無隔膜電解槽への定量ポンプ
21 無隔膜電解槽
22 陽極
23 陰極
24 無隔膜電解槽′の取り出し液の配管
1 Storage tank
2 Metering pump to diaphragmless electrolyzer
3 Metering pump to the anode side of diaphragm cell
4 Metering pump to the cathode side of diaphragm cell
5 Non-membrane electrolytic cell
6 Diaphragm electrolytic cell
7 Cation exchange membrane (diaphragm)
8, 9 DC power supply for electrolysis
10, 12 anode
11, 13 cathode
15 Extraction fluid piping on the anode side of the diaphragm electrolytic cell
16 Drain pipe
17 Tap water piping
18 Electrolyzed water outlet
19 Piping for feeding the liquid from the membrane electrolyzer to the membrane electrolyzer
20 Metering pump to diaphragmless electrolyzer
21 Non-membrane electrolytic cell
22 Anode
23 Cathode
24 Extraction fluid piping of non-membrane electrolyzer
Claims (1)
以上のアルカリ性電解液は、次ぎに隔膜電解槽の陽極側へ供給されて更に電解され、その陽極側に生成したpH６以下、有効塩素濃度1000 ppm 以上の酸性電解水及び、第２無隔膜電解槽で生成されたpH８以上、有効塩素濃度1000
ppm 以上のアルカリ性電解液が混合され、更に水で希釈された
pH 7.5 以上、9.0 以下で、有効塩素濃度 1ppm 以上、500ppm以下の殺菌性電解水が、安定して得られる殺菌性電解水生成装置。 In the electrolysis apparatus including three electrolytic cells composed of the first diaphragm electrolytic cell, the diaphragm electrolytic cell, and the second diaphragm electrolytic cell, the cathode side of the two diaphragm electrolytic cells and the diaphragm electrolytic cell are respectively used as raw materials. NaCl and / or KCl aqueous solution with a concentration of 20g / L or more and 300g / L or less is supplied, pH 8 or more generated in the first membrane electrolyzer, effective chlorine concentration 1000ppm
The above alkaline electrolyte is then supplied to the anode side of the diaphragm cell and further electrolyzed, and the acidic electrolyzed water having a pH of 6 or less and an effective chlorine concentration of 1000 ppm or more generated on the anode side, and the second membrane electrolyte cell PH 8 or higher, effective chlorine concentration 1000
More than ppm alkaline electrolyte was mixed and further diluted with water
A bactericidal electrolyzed water generator capable of stably obtaining bactericidal electrolyzed water having a pH of 7.5 or more and 9.0 or less and an effective chlorine concentration of 1 ppm or more and 500 ppm or less.
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