JP2014176850A - Method for treating open circulation cooling water system - Google Patents
Method for treating open circulation cooling water system Download PDFInfo
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- JP2014176850A JP2014176850A JP2014124386A JP2014124386A JP2014176850A JP 2014176850 A JP2014176850 A JP 2014176850A JP 2014124386 A JP2014124386 A JP 2014124386A JP 2014124386 A JP2014124386 A JP 2014124386A JP 2014176850 A JP2014176850 A JP 2014176850A
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- cooling water
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- 239000000498 cooling water Substances 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000011282 treatment Methods 0.000 claims abstract description 82
- 239000000126 substance Substances 0.000 claims abstract description 29
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 52
- 229910052801 chlorine Inorganic materials 0.000 claims description 52
- 239000000460 chlorine Substances 0.000 claims description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 229910052736 halogen Inorganic materials 0.000 claims description 33
- 150000002367 halogens Chemical class 0.000 claims description 33
- 230000001590 oxidative effect Effects 0.000 claims description 19
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 17
- 238000003672 processing method Methods 0.000 claims description 17
- 239000000645 desinfectant Substances 0.000 claims description 16
- GUUULVAMQJLDSY-UHFFFAOYSA-N 4,5-dihydro-1,2-thiazole Chemical compound C1CC=NS1 GUUULVAMQJLDSY-UHFFFAOYSA-N 0.000 claims description 12
- 239000004480 active ingredient Substances 0.000 claims description 12
- 230000000717 retained effect Effects 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 7
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- 238000012423 maintenance Methods 0.000 claims 1
- 241000589248 Legionella Species 0.000 abstract description 34
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- IMQLKJBTEOYOSI-UHFFFAOYSA-N Diphosphoinositol tetrakisphosphate Chemical compound OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 2
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- PIEXCQIOSMOEOU-UHFFFAOYSA-N 1-bromo-3-chloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Br)C(=O)N(Cl)C1=O PIEXCQIOSMOEOU-UHFFFAOYSA-N 0.000 description 1
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- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Description
本発明は、レジオネラ属を確実に不検出レベルに殺菌、抑制することができ、しかも薬剤耐性菌や薬剤耐性を持った藻類が繁殖しにくい開放循環冷却水系の処理方法に関する。 The present invention relates to a method for treating an open circulating cooling water system that can reliably sterilize and suppress Legionella spp. To a non-detectable level and that is difficult for a drug-resistant bacterium or a drug-resistant algae to propagate.
冷却水系などの循環水系において、バイオフィルムは機器や水系周辺の汚染原因となるとともに、冷却水系においては熱交換効率低下の原因になり、その抑制のために様々な技術的提案が行われている。 In circulating water systems such as cooling water systems, biofilms cause contamination of equipment and surroundings of water systems, and in cooling water systems, it causes a decrease in heat exchange efficiency, and various technical proposals have been made to control them. .
このような技術のうち、本出願人も特開２００９−１６０５０５号公報（特許文献１）で水系水におけるスライム抑制方法を提案している。この方法はハロゲン系酸化物を含む薬剤を添加する技術であり、水系の金属材質に対する腐食を防止しながら極めて効果的にバイオフィルムの抑制が可能となる。このように、ハロゲン系酸化物は細菌類の殺菌、バイオフィルの成長抑制には極めて有効である。 Among such techniques, the present applicant has also proposed a slime suppression method in aqueous water in JP 2009-160505 A (Patent Document 1). This method is a technique of adding a chemical containing a halogen-based oxide, and it is possible to suppress a biofilm extremely effectively while preventing corrosion of an aqueous metal material. Thus, the halogen-based oxide is extremely effective for sterilizing bacteria and suppressing the growth of biofil.
ここで、開放循環冷却水系では、バイオフィルムの抑制の他に、レジオネラ属菌に対する除菌効果も求められる。 Here, in the open circulation cooling water system, in addition to the suppression of the biofilm, a disinfection effect against Legionella is also required.
上記のようなハロゲン系酸化物は、実験室での試験ではレジオネラ属菌に対して優れた殺菌作用を示すが、実際の開放循環冷却水系をハロゲン系酸化物で処理してみると、十分な殺菌、抑制効果が得られない場合が多く、驚くべきことに、遊離残留塩素濃度として２ｍｇ／Ｌを維持してもレジオネラ属菌を殺菌できない水系も存在する。 Although the halogen-based oxides described above show excellent bactericidal action against Legionella spp. In laboratory tests, it is sufficient to treat an actual open circulating cooling water system with a halogen-based oxide. In many cases, the sterilization and inhibitory effects cannot be obtained. Surprisingly, there is an aqueous system in which Legionella spp. Cannot be sterilized even if the free residual chlorine concentration is maintained at 2 mg / L.
さらに、ハロゲン系酸化物の水系への添加を長期間継続すると、メチロバクテリウム等の塩素剤に対して強い耐性を持った細菌類が繁殖し、バイオフィルムを形成する恐れがある。 Furthermore, if the addition of the halogen-based oxide to the aqueous system is continued for a long period of time, bacteria having strong resistance to chlorinating agents such as methylobacterium may propagate and form a biofilm.
一方、有機系の各種の殺菌剤は、レジオネラ属菌の殺菌処理に古くから使われており、高濃度で添加したり、連続的に水系に添加することにより、レジオネラ属菌を効果的に殺菌、抑制することができるとされている。しかし、このような有機系の殺菌剤は、バイオフィルムに対する殺菌、剥離効果が弱いので、間欠的な処理で一時的に水中に浮遊しているレジオネラ属菌が不検出になった場合でも、水系内にバイオフィルムが残存し、これがレジオネラ属菌繁殖の温床となって、比較的短期間でレジオネラ属菌が水中に検出されるようになる。 On the other hand, various organic fungicides have long been used for sterilization of Legionella, and can be effectively sterilized by adding them at high concentrations or by continuously adding them to aqueous systems. It can be suppressed. However, since such organic disinfectants have a weak disinfection and peeling effect on biofilms, even if Legionella spp. Temporarily suspended in water are not detected due to intermittent treatment, A biofilm remains inside, and this becomes a hotbed for breeding Legionella, and Legionella is detected in water in a relatively short period of time.
また、ハロゲン系酸化物と比較して有機系の殺菌剤は耐性菌や耐性を持った藻類が繁殖しやすいという欠点がある。 In addition, compared with halogen-based oxides, organic fungicides have the disadvantage that resistant bacteria and resistant algae can easily propagate.
従って、レジオネラ属を確実に不検出レベルに殺菌、抑制することができ、しかも薬剤耐性菌や薬剤耐性を持った藻類が繁殖しにくい開放循環冷却水系の処理方法が求められていた。 Therefore, a treatment method for an open circulating cooling water system that can surely sterilize and suppress Legionella spp. To a non-detectable level and that is difficult for the drug-resistant bacteria and drug-resistant algae to propagate has been demanded.
本発明は、上記問題を解決する、すなわち、レジオネラ属を確実に不検出レベルに殺菌、抑制することができ、しかも薬剤耐性菌や薬剤耐性を持った藻類が繁殖しにくい開放循環冷却水系の処理方法を提供することを目的とする。 The present invention solves the above problem, that is, treatment of an open circulating cooling water system that can reliably sterilize and suppress Legionella spp. To a non-detectable level, and is difficult for a drug-resistant bacterium and a drug-resistant algae to propagate. It aims to provide a method.
本発明の開放循環冷却水系の処理方法は、上記課題を解決するために、請求項１に記載の通り、開放循環冷却水系の冷却水に対して、ハロゲン系酸化物による処理を常時行い、かつ、有機系殺菌剤による処理を３０日間に１回以上行うことを特徴とする開放循環冷却水系の処理方法である。
In order to solve the above problems, the processing method of the open circulating cooling water system of the present invention, as described in
本発明の開放循環冷却水系の処理方法は、請求項２に記載の通り、請求項１に記載の開放循環冷却水系の処理方法において、前記ハロゲン系酸化物による処理が、水中で遊離塩素を生成する物質を前記冷却水に添加し、前記冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上１ｍｇ／Ｌ以下の範囲に維持する処理であることを特徴とする。
The open circulation cooling water system treatment method according to the present invention is the open circulation cooling water system treatment method according to
本発明の開放循環冷却水系の処理方法は、請求項３に記載の通り、請求項２に記載の開放循環冷却水系の処理方法において、前記水中で遊離塩素を生成する物質が、次亜ハロゲン酸塩、ハロゲン化イソシアヌル酸、ハロゲン化ヒダントインから選択される少なくとも１種であることを特徴とする。
The method for treating an open circulating cooling water system according to the present invention is the processing method for an open circulating cooling water system according to
本発明の開放循環冷却水系の処理方法は、請求項４に記載の通り、請求項１に記載の開放循環冷却水系の処理方法において、前記ハロゲン系酸化物による処理が、水中で結合塩素を生成する物質を前記冷却水に添加し、前記冷却水中の酸化力を全残留塩素濃度として１ｍｇ／Ｌ以上１０ｍｇ／Ｌ以下の範囲に維持する処理であることを特徴とする。
The open circulating cooling water system treatment method according to the present invention is the open circulating cooling water system treatment method according to
本発明の開放循環冷却水系の処理方法は、請求項５に記載の通り、請求項４に記載の開放循環冷却水系の処理方法において、前記水中で結合塩素を生成する物質が、クロラミン類、及び、次亜ハロゲン酸塩とスルファミン酸塩とを反応させて得られる安定化次亜ハロゲン酸塩から選択される少なくとも１種であることを特徴とする。 The open circulation cooling water system treatment method according to the present invention is the open circulation cooling water system treatment method according to claim 4, wherein the substance that generates bound chlorine in water is chloramines, and And at least one selected from stabilized hypohalite obtained by reacting hypohalite and sulfamate.
本発明の開放循環冷却水系の処理方法は、請求項６に記載の通り、請求項１ないし請求項５のいずれか１項に記載の開放循環冷却水系の処理方法において、前記有機系殺菌剤による処理が、５−クロロ−２−メチル−４−イソチアゾリン−３−オン、２−メチル−４−イソチアゾリン−３−オン、２−ｎ−オクチル−４−イソチアゾリン−３−オン、及び、１，２−ベンゾイソチアゾリン−３−オンから選択される少なくとも１種のイソチアゾリン系化合物を、前記冷却水系の保有水量に対する添加濃度が、該イソチアゾリン系化合物の有効成分濃度として１ｍｇ／Ｌ以上２０ｍｇ／Ｌ以下となるように前記冷却水系に添加する処理であり、かつ、該有機系殺菌剤による処理を、２日間ないし３０日間に１回行うことを特徴とする。
The processing method of the open circulation cooling water system of the present invention is the processing method of the open circulation cooling water system according to any one of
本発明の開放循環冷却水系の処理方法は、請求項７に記載の通り、請求項１ないし請求項５のいずれか１項に記載の開放循環冷却水系の処理方法において、前記有機系殺菌剤による処理が、グルタルアルデヒドを、前記冷却水系の保有水量に対する添加濃度が、有効成分濃度として２０ｍｇ／Ｌ以上５００ｍｇ／Ｌ以下となるように前記冷却水系に添加する処理であり、かつ、該有機系殺菌剤による処理を、２日間ないし３０日間に１回行うことを特徴とする。
The processing method of the open circulation cooling water system of this invention is the processing method of the open circulation cooling water system of any one of
本発明の開放循環冷却水系の処理方法によれば、ハロゲン系酸化物による処理と有機系殺菌剤による処理を併用することで、レジオネラ属菌を確実に不検出レベルに殺菌、抑制することができ、しかも薬剤耐性菌や薬剤耐性を持った藻類が繁殖しにくい開放循環冷却水系とすることができる。 According to the processing method of the open circulation cooling water system of the present invention, Legionella spp. Can be reliably sterilized and suppressed to an undetectable level by using a treatment with a halogen-based oxide and a treatment with an organic disinfectant in combination. Moreover, it is possible to provide an open circulating cooling water system in which drug-resistant bacteria and drug-resistant algae hardly propagate.
このとき、冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上５ｍｇ／Ｌ以下の範囲に２４時間に１時間以上維持することで、レジオネラ属菌繁殖の温床となる水系内のバイオフィルムを効果的に抑制することができ、また、薬剤耐性菌や薬剤耐性を持った藻類の繁殖を有効に抑えることができる。 At this time, by maintaining the oxidizing power in the cooling water within a range of 0.01 mg / L or more and 5 mg / L or less as a free residual chlorine concentration for 1 hour or more in 24 hours, the bio-in-water system that becomes a hotbed for Legionella spp. The film can be effectively suppressed, and the propagation of drug-resistant bacteria and drug-resistant algae can be effectively suppressed.
また、冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上１ｍｇ／Ｌ以下の範囲に常時維持することで、水系で用いられる機器などの軟鋼や銅などの金属に対する腐食性を効果的に防ぎながら、レジオネラ属菌の殺菌と、耐性菌、耐性藻類の繁殖抑制を可能とする。 In addition, by maintaining the oxidizing power in cooling water within the range of 0.01 mg / L or more and 1 mg / L or less as free residual chlorine concentration, it is effective for corrosiveness to metals such as mild steel and copper used in water systems. It is possible to sterilize Legionella spp. And to suppress the growth of resistant bacteria and algae.
さらに、ハロゲン系酸化物として、水中で結合塩素を生成する物質を使用することで、冷却水中に酸化力を維持することが容易となり、このとき、冷却水中の酸化力を全残留塩素濃度として１ｍｇ／Ｌ以上１００ｍｇ／Ｌ以下の範囲に２４時間に１時間以上維持することで、レジオネラ属菌繁殖の温床となる水系内のバイオフィルムを、より効果的に抑制することができる。また、薬剤耐性菌や薬剤耐性を持った藻類の繁殖を、より有効に抑えることができる。 Furthermore, by using a substance that generates bonded chlorine in water as a halogen-based oxide, it becomes easy to maintain oxidizing power in cooling water. At this time, the oxidizing power in cooling water is 1 mg as the total residual chlorine concentration. By maintaining in the range of / L or more and 100 mg / L or less for 1 hour or more in 24 hours, the biofilm in the aqueous system that serves as a hotbed for Legionella spp. Breeding can be more effectively suppressed. In addition, the propagation of drug-resistant bacteria and drug-resistant algae can be more effectively suppressed.
加えて、冷却水中の酸化力を全残留塩素濃度として１ｍｇ／Ｌ以上１０ｍｇ／Ｌ以下の範囲に常時維持することで、水系で用いられる機器などの軟鋼や銅などの金属に対する腐食性をより効果的に防ぎながら、レジオネラ属菌の殺菌と、耐性菌、耐性藻類の繁殖抑制を可能とする。 In addition, by constantly maintaining the oxidizing power in the cooling water within the range of 1 mg / L to 10 mg / L as the total residual chlorine concentration, it is more effective in corrosiveness to mild steel such as equipment used in water systems and metals such as copper. It is possible to sterilize Legionella spp. And to suppress the growth of resistant bacteria and algae.
また、有機系殺菌剤による処理として、５−クロロ−２−メチル−４−イソチアゾリン−３−オン、２−メチル−４−イソチアゾリン−３−オン、２−ｎ−オクチル−４−イソチアゾリン−３−オン、及び、１，２−ベンゾイソチアゾリン−３−オンから選択される少なくとも１種のイソチアゾリン系化合物を、冷却水系の保有水量に対する添加濃度が、該イソチアゾリン系化合物の有効成分濃度として１ｍｇ／Ｌ以上２０ｍｇ／Ｌ以下となるように冷却水系に添加する処理を、２日間ないし３０日間に１回行うことにより、少ない有機系殺菌剤の添加量で、レジオネラ属菌の殺菌、抑制効果を長期間、確実に得ることができ、さらに、メチロバクテリウム等の塩素耐性菌の繁殖を効果的に抑えることが可能となる。 Further, as treatment with an organic disinfectant, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazoline-3- The concentration of addition of at least one isothiazoline compound selected from ON and 1,2-benzisothiazolin-3-one to the amount of water retained in the cooling water system is 1 mg / L or more as the active ingredient concentration of the isothiazoline compound By performing the treatment to be added to the cooling water system so as to be 20 mg / L or less once every 2 to 30 days, with a small amount of organic fungicide added, the sterilization of Legionella spp. It is possible to reliably obtain, and furthermore, it is possible to effectively suppress the propagation of chlorine-resistant bacteria such as methylobacterium.
あるいは、有機系殺菌剤による処理として、グルタルアルデヒドを、冷却水系の保有水量に対する添加濃度が、有効成分濃度として２０ｍｇ／Ｌ以上５００ｍｇ／Ｌ以下となるように冷却水系に添加する処理を、２日間ないし３０日間に１回行うことにより、少ない有機系殺菌剤の添加量で、レジオネラ属菌の殺菌、抑制効果を長期間、確実に得ることができ、さらに、メチロバクテリウム等の塩素耐性菌の繁殖を効果的に抑えることが可能となる。 Alternatively, as a treatment with an organic disinfectant, a treatment in which glutaraldehyde is added to a cooling water system so that an addition concentration with respect to the amount of retained water in the cooling water system is 20 mg / L or more and 500 mg / L or less as an active ingredient concentration is performed for 2 days. In addition, by performing once every 30 days, the effect of sterilization and suppression of Legionella spp. Can be reliably obtained for a long period of time with a small amount of organic fungicide added, and chlorine-resistant bacteria such as methylobacterium It is possible to effectively suppress the breeding.
本発明の開放循環冷却水系の処理方法は、上述のように、開放循環冷却水系の冷却水に対して、ハロゲン系酸化物による処理を常時行い、かつ、有機系殺菌剤による処理を３０日間に１回以上行うことを特徴とする開放循環冷却水系の処理方法である。 As described above, the processing method of the open circulating cooling water system of the present invention always performs the treatment with the halogen-based oxide on the cooling water of the open circulating cooling water system, and the treatment with the organic disinfectant for 30 days. It is the processing method of the open circulation cooling water system characterized by performing once or more.
本発明において、ハロゲン系酸化物としては、水中で酸化力を示すハロゲン系酸化物であれば良く、具体的には、水中で遊離塩素を生成する物質及び水中で結合塩素を生成する物質から選択される少なくとも１種の物質を用いる。 In the present invention, the halogen-based oxide may be any halogen-based oxide that exhibits oxidizing power in water. Specifically, it is selected from substances that generate free chlorine in water and substances that generate bound chlorine in water. At least one substance is used.
水中で遊離塩素を生成する物質とは、その物質を添加した水系水をＪＩＳ Ｋ０１０１ ２８に記載の残留塩素測定法により測定した際に、遊離残留塩素が検出される物質のことであり、例えば、次亜塩素酸ナトリウム、次亜塩素酸カルシウム、次亜臭素酸ナトリウム等の次亜ハロゲン酸塩、ジクロロイソシアヌル酸ナトリウム、トリクロロイソシアヌル酸等のハロゲン化イソシアヌル酸、１−ブロモ−３−クロロ−５，５−ジメチルヒダントイン、１，３−ジブロモ−５，５−ジメチルヒダントイン、１，３−ジクロロ−５，５−ジメチルヒダントイン、１，３−ジクロロ−５，５−エチルメチルヒダントイン、及び、１，３−ジクロロ−５，５−ジエチルヒダントイン等のハロゲン化ヒダントイン等を挙げることができる。 The substance that generates free chlorine in water is a substance in which free residual chlorine is detected when the aqueous water to which the substance is added is measured by the residual chlorine measurement method described in JIS K0101 28. Hypohalites such as sodium hypochlorite, calcium hypochlorite and sodium hypobromite, halogenated isocyanuric acids such as sodium dichloroisocyanurate and trichloroisocyanuric acid, 1-bromo-3-chloro-5, 5-dimethylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, 1,3-dichloro-5,5-ethylmethylhydantoin, and 1,3 -Halogenated hydantoins such as dichloro-5,5-diethylhydantoin.
また、水中で結合塩素を生成する物質とは、その物質を添加した水系水をＪＩＳ Ｋ０１０１ ２８に記載の残留塩素測定法により測定した際に、結合残留塩素が検出される物質のことであり、例えば、モノクロラミン、ジクロラミン、トリクロラミン、クロラミンＢ（ベンゼンスルホンクロラミドナトリウム塩）、及び、クロラミンＴ（Ｎ−クロロ−ｐ−トルエンスルホンアミドナトリウム塩）等のクロラミン類、及び、安定化次亜ハロゲン酸塩等を挙げることができる。 In addition, the substance that generates bound chlorine in water is a substance in which bound residual chlorine is detected when the aqueous water added with the substance is measured by the residual chlorine measuring method described in JIS K0101 28. For example, chloramines such as monochloramine, dichloramine, trichloramine, chloramine B (benzenesulfonchloramide sodium salt), and chloramine T (N-chloro-p-toluenesulfonamide sodium salt), and stabilized hypohalogen An acid salt etc. can be mentioned.
安定化次亜ハロゲン酸塩としては、特表２００３−５０３３２３公報（特許文献２）や特表平１１−５０６１３９号公報（特許文献３）に開示されているように、次亜塩素酸塩とスルファミン酸塩とから得られる安定化次亜塩素酸塩、臭化ナトリウム、臭化カリウム、臭化リチウム等から１種以上選ばれる臭素イオン源、次亜塩素酸塩、及び、スルファミン酸塩から得られる安定化次亜臭素酸塩を用いることができる。 As the stabilized hypohalite, hypochlorite and sulfamine are disclosed in JP-T-2003-503323 (Patent Document 2) and JP-A-11-506139 (Patent Document 3). It is obtained from a bromine ion source, hypochlorite, and sulfamate selected from one or more of stabilized hypochlorite, sodium bromide, potassium bromide, lithium bromide and the like obtained from acid salts Stabilized hypobromite can be used.
また、水中で結合塩素を生成する物質として、予めアンモニアが存在している水系に次亜ハロゲン酸塩を添加して、水系中でクロラミン類を生成させたり、予めスルファミン酸が存在している水系に次亜ハロゲン酸塩を添加して、水系中で安定化次亜ハロゲン酸塩を生成させても良く、この場合も本発明に含まれる。 In addition, as a substance that generates bound chlorine in water, hypohalite is added to an aqueous system in which ammonia is present in advance to generate chloramines in the aqueous system, or an aqueous system in which sulfamic acid is present in advance. Hypohalite may be added to the solution to form a stabilized hypohalite in an aqueous system, and this case is also included in the present invention.
ここで、次亜ハロゲン酸塩などの水中で遊離塩素を生成する物質の場合、冷却水中の有機物などと反応して速やかに分解してしまうため、有効濃度を一定レベルに維持するのが難しく、その結果、濃度低下のために十分な微生物抑制効果が得られなかったり、あるいは、過剰添加により重要な機器に腐食が生じたりするおそれがある。一方、水中で結合塩素を生成する物質、特に、次亜ハロゲン酸塩とスルファミン酸塩とを反応させて得られる安定化次亜ハロゲン酸塩は、冷却水中での分解速度が遅く、その濃度変化が少ないので、有効濃度の維持が容易であり、結果として安定した効果が得られるので好ましい。 Here, in the case of substances that generate free chlorine in water such as hypohalite, it reacts with organic matter in cooling water and decomposes quickly, so it is difficult to maintain an effective concentration at a certain level, As a result, there is a possibility that a sufficient microbial control effect cannot be obtained due to a decrease in concentration, or that important equipment is corroded due to excessive addition. On the other hand, substances that produce bound chlorine in water, especially stabilized hypohalite obtained by reacting hypohalite and sulfamate, have a slow decomposition rate in cooling water, and its concentration changes. Therefore, the effective concentration can be easily maintained, and as a result, a stable effect can be obtained, which is preferable.
開放循環冷却水系の冷却水に、これらハロゲン系酸化物を添加するハロゲン系酸化物による処理は、レジオネラ属菌繁殖の温床となる水系内のバイオフィルムを効果的に抑制し、薬剤耐性菌や薬剤耐性を持った藻類の繁殖を有効に抑えるためには、２４時間に少なくとも１時間以上行う必要がある。十分な微生物抑制効果を得るためには、高濃度のハロゲン系酸化物による処理が好ましいが、高濃度のハロゲン系酸化物を冷却水系に添加すると、冷却水系を構成する機器、配管等の金属材質が腐食するリスクが高まる。 Treatment with halogen-based oxides that add these halogen-based oxides to the cooling water in open circulation cooling water systems effectively suppresses biofilms in the water system that serves as a hotbed for Legionella spp. In order to effectively suppress the growth of algae with resistance, it is necessary to carry out at least 1 hour in 24 hours. In order to obtain a sufficient microbial control effect, treatment with high-concentration halogen-based oxides is preferable, but when high-concentration halogen-based oxides are added to the cooling water system, metal materials such as equipment and pipes constituting the cooling water system Increases the risk of corrosion.
そこで、水中で遊離塩素を生成する物質で処理するときのハロゲン系酸化物の濃度は、２４時間に１時間、あるいはそれよりも長く、間欠的に処理を行う場合には冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上５ｍｇ／Ｌ以下の範囲に維持するように、また、常時連続的に処理を行う場合には冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上１ｍｇ／Ｌ以下の範囲に維持するように、添加量を調整することが好ましい。なお、遊離残留塩素の測定は、ＪＩＳ Ｋ０１０１ ２８に準拠した方法で実施する。また、ＪＩＳ Ｋ０１０１ ２８に記載の方法と同様の測定結果が得られる方法であれば、遊離残留塩素濃度測定電極や、その他の測定機器を用いて測定しても構わない。 Therefore, the concentration of the halogen-based oxide when treated with a substance that generates free chlorine in water is 1 hour per 24 hours or longer, and in the case of intermittent treatment, the oxidizing power in the cooling water is increased. The free residual chlorine concentration is maintained within the range of 0.01 mg / L or more and 5 mg / L or less. In the case of continuous continuous treatment, the oxidizing power in the cooling water is set to 0.01 mg / L as the free residual chlorine concentration. It is preferable to adjust the addition amount so as to maintain the range of L or more and 1 mg / L or less. In addition, the measurement of free residual chlorine is implemented by the method based on JISK010128. Moreover, as long as the measurement result similar to the method described in JIS K0101 28 is obtained, the measurement may be performed using a free residual chlorine concentration measuring electrode or other measuring equipment.
水中で遊離塩素を生成する物質を用いてハロゲン系酸化物による処理を行う場合の、より好ましい処理方法は、冷却水中の酸化力を遊離残留塩素濃度として０．０１ｍｇ／Ｌ以上０．１ｍｇ／Ｌ以下の範囲に常時維持する方法であり、この方法によると、レジオネラ属菌繁殖の温床となるバイオフィルムを効果的に抑制し、薬剤耐性菌や薬剤耐性を持った藻類の繁殖を有効に抑えるとともに、冷却水系を構成する機器、配管等の腐食リスクを極めて低レベルに抑えることができる。 A more preferable treatment method in the case of performing treatment with a halogen-based oxide using a substance that generates free chlorine in water is 0.01 mg / L or more and 0.1 mg / L as the free residual chlorine concentration in the cooling water. This method is always maintained within the following range. According to this method, the biofilm, which is a hotbed for the growth of Legionella spp., Is effectively suppressed, and the growth of drug-resistant bacteria and drug-resistant algae is effectively suppressed. The risk of corrosion of equipment, piping, etc. constituting the cooling water system can be suppressed to an extremely low level.
一方、水中で結合塩素を生成する物質で処理するときのハロゲン系酸化物の濃度は、２４時間に１時間あるいはそれよりも長く間欠的に処理を行う場合には冷却水中の酸化力を全残留塩素濃度として１ｍｇ／Ｌ以上１００ｍｇ／Ｌ以下の範囲に維持するように、また、常時連続的に処理を行う場合には冷却水中の酸化力を全残留塩素濃度として１ｍｇ／Ｌ以上１０ｍｇ／Ｌ以下の範囲に維持するように、添加量を調整することが好ましい。なお、全残留塩素の測定は、ＪＩＳ Ｋ０１０１ ２８に準拠した方法で実施する。また、ＪＩＳ Ｋ０１０１ ２８に記載の方法と同様の測定結果が得られる方法であれば、全残留塩素濃度測定電極や、その他の測定機器を用いて測定しても構わない。 On the other hand, the concentration of the halogen-based oxide when treating with a substance that generates bound chlorine in water is such that when the treatment is intermittently performed for one hour every 24 hours or longer, the oxidizing power in the cooling water is completely retained. Maintain the chlorine concentration in the range of 1 mg / L or more and 100 mg / L or less, and in the case of continuous continuous treatment, the oxidizing power in the cooling water is 1 mg / L or more and 10 mg / L or less as the total residual chlorine concentration. It is preferable to adjust the addition amount so as to maintain the above range. In addition, the measurement of total residual chlorine is implemented by the method based on JISK010128. Moreover, as long as the measurement result similar to the method described in JIS K0101 28 is obtained, the measurement may be performed using a total residual chlorine concentration measurement electrode or other measurement equipment.
水中で結合塩素を生成する物質を用いてハロゲン系酸化物による処理を行う場合の、より好ましい処理方法は、水中で結合塩素を生成する物質として次亜ハロゲン酸塩とスルファミン酸塩とを反応させて得られる安定化次亜ハロゲン酸塩を用いる方法であり、このとき、冷却水中の全残留塩素濃度を１ｍｇ/Ｌ以上２ｍｇ／Ｌ以下の範囲に常時維持することがさらに好ましい。安定化次亜ハロゲン酸塩は、他のハロゲン系酸化物と比較して冷却水中で安定であり、冷却水中の酸化力を低濃度レベルに維持するのに適している。従って、この方法によると、レジオネラ属菌繁殖の温床となるバイオフィルムを効果的に抑制し、薬剤耐性菌や薬剤耐性を持った藻類の繁殖を有効に抑えるとともに、冷却水系を構成する機器、配管等の腐食リスクを極めて低レベルに抑えるという効果を、より確実に発揮させることができる。 A more preferable treatment method in the case of performing treatment with a halogen-based oxide using a substance that generates bonded chlorine in water is to react hypohalite and sulfamate as a substance that generates bonded chlorine in water. In this case, it is more preferable to always maintain the total residual chlorine concentration in the cooling water in the range of 1 mg / L to 2 mg / L. Stabilized hypohalite is more stable in cooling water than other halogen-based oxides, and is suitable for maintaining the oxidizing power in cooling water at a low concentration level. Therefore, according to this method, the biofilm that is a hotbed for Legionella spp. Breeding is effectively suppressed, the propagation of drug-resistant bacteria and drug-resistant algae is effectively suppressed, and the equipment and piping that constitute the cooling water system The effect of suppressing the corrosion risk such as the above to a very low level can be exhibited more reliably.
本発明における有機系殺菌剤による処理はレジオネラ属菌を確実に不検出レベルに殺菌、抑制するために、３０日間に１回以上行うことが必要である。このとき、２日間よりも短い期間に１回の割合での有機系殺菌剤による処理、あるいは、継続した有機系殺菌剤による処理を行うことは、薬剤を多量に消費するにもかかわらず、その消費量の増加に見合った効果の増大は得られないので好ましくない。 The treatment with the organic fungicide in the present invention needs to be carried out at least once every 30 days in order to surely sterilize and suppress Legionella spp. At this time, the treatment with the organic fungicide at a rate of once in a period shorter than 2 days, or the continuous treatment with the organic fungicide, does not consume a large amount of the drug. Since an increase in effect commensurate with the increase in consumption cannot be obtained, it is not preferable.
有機系殺菌剤による処理において用いる薬剤は、レジオネラ属菌を確実に殺菌できる物質であれば特に限定されず、例えば、イソチアゾリン系化合物、グルタルアルデヒド、フタルアルデヒド、２−ブロモ−２−ニトロプロパン−１，３−ジオール、２，２−ジブロモ−２−ニトロエタノール、２，２−ジブロモ−３−ニトリロプロピオンアミド、２−ピリジンチオール−１−オキシドナトリウム、ジンクピリチオン、４，５−ジクロロ−１，２−ジチオラン−３−オン、メチレンビスチオシアネート、Ｎ−デシル−Ｎ−イソノニル−Ｎ，Ｎ−ジメチルアンモニウムクロライド、ポリ[オキシエチレン（ジメチルイミニオ）エチレン（ジメチルイミニオ）エチレンジクロライド]、ポリ（２−ヒドロキシプロピルジメチルアンモニウムクロライド）、Ｎ，Ｎ'−ヘキサメチレンビス（４−カルバモイル−１−デシルピリジニウムブロマイド）、１，４−ビス（３，３'−（１−デシルピリジニウムメチルオキシ））ブタンジブロマイド、トリｎ−ブチル−ｎ−ヘキサデシルホスホニウムクロライド、トリｎ−ブチル−ｎ−ドデシルホスホニウムクロライド、テトラキス（ヒドロキシメチルホスホニウム）硫酸塩、Ｎ，Ｎ−ビス（３−アミノプロピル）ドデシルアミンなどが挙げられ、これらから１種以上選択して用いることができる。このうち、ハロゲン系酸化剤と併用することで、少ない添加量で確実にレジオネラ属菌を殺菌、抑制することができ、しかもメチロバクテリウム等の強い塩素耐性を示す細菌類の繁殖も有効に抑えられる点で、イソチアゾリン系化合物、あるいは、グルタルアルデヒドを用いるのが好ましい。 The agent used in the treatment with the organic disinfectant is not particularly limited as long as it can reliably disinfect Legionella spp., For example, isothiazoline compound, glutaraldehyde, phthalaldehyde, 2-bromo-2-nitropropane-1 , 3-diol, 2,2-dibromo-2-nitroethanol, 2,2-dibromo-3-nitrilopropionamide, 2-pyridinethiol-1-oxide sodium, zinc pyrithione, 4,5-dichloro-1,2- Dithiolane-3-one, methylenebisthiocyanate, N-decyl-N-isononyl-N, N-dimethylammonium chloride, poly [oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride], poly (2-hydroxy Propyldimethylammonium chloride ), N, N′-hexamethylenebis (4-carbamoyl-1-decylpyridinium bromide), 1,4-bis (3,3 ′-(1-decylpyridiniummethyloxy)) butanedibromide, tri-n-butyl -N-hexadecylphosphonium chloride, tri-n-butyl-n-dodecylphosphonium chloride, tetrakis (hydroxymethylphosphonium) sulfate, N, N-bis (3-aminopropyl) dodecylamine, and the like. These can be selected and used. Of these, when used in combination with a halogen-based oxidant, Legionella spp. Can be reliably sterilized and controlled with a small amount of addition, and the propagation of bacteria with strong chlorine resistance such as methylobacterium is also effective. It is preferable to use an isothiazoline-based compound or glutaraldehyde in terms of suppression.
イソチアゾリン系化合物としては、たとえば５−クロロ−２−メチル−４−イソチアゾリン−３−オン、２−メチル−４−イソチアゾリン−３−オン、２−ｎ−オクチル−４−イソチアゾリン−３−オン、及び、１，２−ベンゾイソチアゾリン−３−オンが挙げられ、これらから少なくとも１種を選択して開放循環冷却水系の保有水量に対するイソチアゾリン系化合物の有効成分濃度が１ｍｇ／Ｌ以上２０ｍｇ／Ｌ以下となるように冷却水系に添加する。このとき、イソチアゾリン系化合物による処理を２日間ないし３０日間に1回行うことにより、確実かつ効果的にレジオネラ属菌を殺菌、抑制することができる。 Examples of the isothiazoline-based compound include 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, and 1,2-benzisothiazolin-3-one, and the active ingredient concentration of the isothiazoline compound relative to the amount of water held in the open circulation cooling water system is 1 mg / L or more and 20 mg / L or less by selecting at least one of them To the cooling water system. At this time, by performing the treatment with the isothiazoline-based compound once every 2 to 30 days, the Legionella genus can be sterilized and suppressed reliably.
一方、有機系殺菌剤による処理が、グルタルアルデヒドを冷却水系に添加する処理であるときには、開放循環冷却水系の保有水量に対するグルタルアルデヒドの有効成分濃度が２０ｍｇ／Ｌ以上５００ｍｇ／Ｌ以下となるようにグルタルアルデヒドを冷却水に添加する処理を、２日間ないし３０日間に1回行うことにより、確実かつ効果的にレジオネラ属菌を殺菌、抑制することができる。 On the other hand, when the treatment with the organic disinfectant is a treatment of adding glutaraldehyde to the cooling water system, the active ingredient concentration of glutaraldehyde with respect to the amount of water held in the open circulation cooling water system is 20 mg / L or more and 500 mg / L or less. By performing the treatment of adding glutaraldehyde to cooling water once every 2 to 30 days, Legionella spp. Can be sterilized and suppressed reliably.
上記したハロゲン系酸化物による処理と、有機系殺菌剤による処理を併用することで、レジオネラ属菌を確実に不検出レベルに殺菌、抑制することができ、その効果を長期間持続させることができる。しかも、薬剤耐性菌や薬剤耐性を持った藻類、あるいは、メチロバクテリウム等の強い塩素耐性を示す細菌類の繁殖等も効果的に抑えることができるので、開放循環冷却水系の微生物制御方法として非常に有用である。 By combining the treatment with the halogen-based oxide and the treatment with the organic fungicide as described above, Legionella spp. Can be reliably sterilized and suppressed to an undetectable level, and the effect can be maintained for a long time. . In addition, it is possible to effectively suppress the growth of drug-resistant bacteria, drug-resistant algae, or bacteria with strong chlorine resistance such as methylobacterium, etc. Very useful.
本発明の開放循環冷却水系の処理方法は、さらにその特性を改良するなどの目的で、本発明の効果が損なわれない限り、例えばアクリル酸系、マレイン酸系、メタクリル酸系、スルホン酸系、イタコン酸系、または、イソブチレン系の各重合体やこれらの共重合体、燐酸系重合体、有機ホスホン酸、有機ホスフィン酸、あるいはこれらの水溶性塩などのスケール防止剤、例えばベンゾトリアゾール、トリルトリアゾール等のアゾール類、例えばエチレンジアミン、ジエチレントリアミン等のアミン系化合物、例えばニトリロ三酢酸、エチレンジアミン四酢酸、ジエチレントリアミン五酢酸等のアミノカルボン酸系化合物、例えばグルコン酸、クエン酸、シュウ酸、ギ酸、酒石酸、フィチン酸、琥珀酸、乳酸等の有機カルボン酸など、各種の水処理剤を併用することができ、その場合も本発明に含まれる。 The treatment method of the open circulating cooling water system of the present invention is not limited to the effects of the present invention for the purpose of further improving the characteristics, for example, acrylic acid-based, maleic acid-based, methacrylic acid-based, sulfonic acid-based, Itaconic acid-based or isobutylene-based polymers and copolymers thereof, phosphoric acid-based polymers, organic phosphonic acids, organic phosphinic acids, or water-soluble salts thereof such as benzotriazole and tolyltriazole Such as ethylenediamine, diethylenetriamine, and other amine compounds, such as nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and other aminocarboxylic acid compounds such as gluconic acid, citric acid, oxalic acid, formic acid, tartaric acid, and phytin. Various waters such as acids, succinic acid, organic carboxylic acids such as lactic acid It can be used in combination with physical agents, in which case is also included in the present invention.
特に、アゾール類等の防食剤を併用することにより、ハロゲン系酸化物の使用による銅管の腐食を効果的に抑制することができるので、好ましい。 In particular, it is preferable to use an anticorrosive agent such as azoles in combination, since corrosion of the copper tube due to the use of a halogen-based oxide can be effectively suppressed.
以下に、本発明の開放循環冷却水系の処理方法の実施例について具体的に説明する。 Below, the Example of the processing method of the open circulation cooling water system of this invention is described concretely.
茨城県内某所のビル空調用冷却塔（冷凍能力５００ＲＴ、保有水量１０ｍ3）で以下の試験を実施した。 The following tests were conducted in a building air conditioning cooling tower (refrigeration capacity: 500 RT, water holding amount: 10 m 3 ) in some places in Ibaraki Prefecture.
＜処理条件１（ハロゲン系酸化物による単独処理）＞
次亜塩素酸ナトリウム７重量％とスルファミン酸ナトリウム２０重量％とを含有する安定化次亜塩素酸ナトリウム製剤を、冷却水中の酸化力が全残留塩素濃度として１〜２ｍｇ／Ｌを常時維持するように添加した。その後、１週間に１回、この冷却水中のレジオネラ属菌数を測定した。結果を図１に示す。
<Treatment condition 1 (single treatment with halogen-based oxide)>
Stabilized sodium hypochlorite formulation containing 7% by weight sodium hypochlorite and 20% by weight sodium sulfamate so that the oxidizing power in the cooling water always maintains a total residual chlorine concentration of 1-2 mg / L Added to. Thereafter, the number of Legionella in this cooling water was measured once a week. The results are shown in FIG.
＜処理条件２（有機系殺菌剤（イソチアゾリン系化合物）による単独処理）＞
５−クロロ−２−メチル−４−イソチアゾリン−３−オンを１０重量％、２−メチル−４−イソチアゾリン−３−オンを３重量％それぞれ含有するイソチアゾリン製剤を、７日ごとに１回、冷却水系の保有水量に対する添加濃度が３０ｍｇ／Ｌ（有効成分の合計濃度として３．９ｍｇ／Ｌ）となるように添加し、薬剤添加直前、薬剤添加１日後、及び、薬剤添加４日後の週３回、冷却水中のレジオネラ属菌数を測定した。結果を図１に示す。
<Treatment condition 2 (single treatment with organic fungicide (isothiazoline compound))>
Cool an isothiazoline preparation containing 10% by weight of 5-chloro-2-methyl-4-isothiazolin-3-one and 3% by weight of 2-methyl-4-isothiazolin-3-one once every 7 days. Add so that the concentration of addition to the amount of water held in the aqueous system is 30 mg / L (3.9 mg / L as the total concentration of active ingredients), 3 times a week immediately before drug addition, 1 day after drug addition, and 4 days after drug addition The number of Legionella in the cooling water was measured. The results are shown in FIG.
＜処理条件３（ハロゲン系酸化物による処理と有機系殺菌剤（イソチアゾリン系化合物）による処理とを併用）＞
次亜塩素酸ナトリウム７重量％とスルファミン酸ナトリウム２０重量％とを含有する安定化次亜塩素酸ナトリウム製剤を、冷却水中の酸化力が全残留塩素濃度として１〜２ｍｇ／Ｌを常時維持するように添加し、かつ、５−クロロ−２−メチル−４−イソチアゾリン−３−オンを１０重量％、２−メチル−４−イソチアゾリン−３−オンを３重量％それぞれ含有するイソチアゾリン製剤を、７日ごとに１回、冷却水系の保有水量に対する添加濃度が３０ｍｇ／Ｌ（有効成分の合計濃度として３．９ｍｇ／Ｌ）となるように添加した。このとき、イソチアゾリン製剤添加直前、イソチアゾリン製剤添加１日後、及び、イソチアゾリン製剤添加４日後の週３回、冷却水中のレジオネラ属菌数を測定した。結果を図１に示す。
<Treatment condition 3 (combination of treatment with halogen-based oxide and treatment with organic fungicide (isothiazoline compound))>
Stabilized sodium hypochlorite formulation containing 7% by weight sodium hypochlorite and 20% by weight sodium sulfamate so that the oxidizing power in the cooling water always maintains a total residual chlorine concentration of 1-2 mg / L And an isothiazoline preparation containing 10% by weight of 5-chloro-2-methyl-4-isothiazolin-3-one and 3% by weight of 2-methyl-4-isothiazolin-3-one for 7 days. Once every time, the addition concentration was 30 mg / L with respect to the amount of retained water in the cooling water system (3.9 mg / L as the total concentration of active ingredients). At this time, the number of Legionella spp. In the cooling water was measured three times a week immediately before the addition of the isothiazoline preparation, one day after the addition of the isothiazoline preparation, and four days after the addition of the isothiazoline preparation. The results are shown in FIG.
＜処理条件４（有機系殺菌剤（グルタルアルデヒド）による単独処理）＞
グルタルアルデヒドを、７日ごとに１回、冷却水系の保有水量に対する添加濃度が、有効成分濃度として５０ｍｇ／Ｌとなるように添加した。このとき、薬剤添加直前、薬剤添加１日後、及び、薬剤添加４日後の週３回、冷却水中のレジオネラ属菌数を測定した。結果を図２に示す。
<Treatment condition 4 (single treatment with organic disinfectant (glutaraldehyde))>
Glutaraldehyde was added once every 7 days so that the addition concentration with respect to the amount of retained water in the cooling water system was 50 mg / L as the active ingredient concentration. At this time, the number of Legionella spp. In the cooling water was measured immediately before drug addition, 1 day after drug addition, and 3 times a week after 4 days after drug addition. The results are shown in FIG.
＜処理条件５（ハロゲン系酸化物による処理と有機系殺菌剤（グルタルアルデヒド）による処理とを併用）＞
次亜塩素酸ナトリウム７重量％とスルファミン酸ナトリウム２０重量％とを含有する安定化次亜塩素酸ナトリウム製剤を、冷却水中の酸化力が全残留塩素濃度として１〜２ｍｇ／Ｌを常時維持するように添加し、かつ、グルタルアルデヒドを、７日ごとに１回、冷却水系の保有水量に対する添加濃度が、有効成分濃度として５０ｍｇ／Ｌとなるように添加した。このとき、グルタルアルデヒド添加直前、グルタルアルデヒド添加１日後、及び、グルタルアルデヒド添加４日後の週３回、冷却水中のレジオネラ属菌数を測定した。結果を図２に示す。
<Treatment condition 5 (combination of treatment with halogenated oxide and treatment with organic fungicide (glutaraldehyde))>
Stabilized sodium hypochlorite formulation containing 7% by weight sodium hypochlorite and 20% by weight sodium sulfamate so that the oxidizing power in the cooling water always maintains a total residual chlorine concentration of 1-2 mg / L In addition, glutaraldehyde was added once every 7 days so that the concentration of addition to the amount of retained water in the cooling water system was 50 mg / L as the active ingredient concentration. At this time, the number of Legionella bacteria in the cooling water was measured three times a week immediately before the addition of glutaraldehyde, one day after the addition of glutaraldehyde, and four days after the addition of glutaraldehyde. The results are shown in FIG.
これら図１及び図２より本発明に係る開放循環冷却水系の処理方法によれば、レジオネラ属菌を効果的に抑制し、不検出とすることができることが判る。なお、各処理条件による試験終了時（試験開始から１ヶ月後）に冷却塔を観察したところ、上記処理条件１では、冷却塔下部水槽にピンク色のバイオフィルム（メチロバクテリウムと推定）の付着が、処理条件２では、冷却塔上部水槽に粒状緑藻の付着が、処理条件４では、冷却塔充填材にカビを主体とするバイオフィルムの付着がそれぞれ認められた。一方、処理条件３及び処理条件５では、各処理条件で処理した１ヶ月間、冷却塔は清浄な状態が保たれた。
1 and 2, it can be seen that according to the processing method of the open circulation cooling water system according to the present invention, Legionella spp. Can be effectively suppressed and detected. In addition, when the cooling tower was observed at the end of the test according to each processing condition (one month after the start of the test), under the
以上の結果から、本発明の開放循環冷却水系の処理方法によれば、レジオネラ属菌を確実に不検出レベルに殺菌、抑制することができ、その効果を長期間持続させることができること、薬剤耐性菌や薬剤耐性を持った藻類、あるいは、メチロバクテリウム等の強い塩素耐性を示す細菌類の繁殖等も効果的に抑えることができることが理解される。 From the above results, according to the processing method of the open circulation cooling water system of the present invention, Legionella spp. Can be reliably sterilized and suppressed to a non-detection level, and the effect can be sustained for a long period of time. It is understood that the growth of bacteria, drug-resistant algae, or bacteria showing strong chlorine resistance such as methylobacterium can be effectively suppressed.
Claims (7)
有機系殺菌剤による処理を３０日間に１回以上行うことを特徴とする開放循環冷却水系の処理方法。 For the cooling water in the open circulation cooling water system, treatment with a halogen-based oxide is always performed, and
A treatment method of an open circulating cooling water system, characterized in that the treatment with an organic disinfectant is performed at least once every 30 days.
該有機系殺菌剤による処理を、２日間ないし３０日間に１回行うことを特徴とする請求項１ないし請求項５のいずれか１項に記載の開放循環冷却水系の処理方法。 The treatment with the organic disinfectant is performed by treating 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one And at least one isothiazoline-based compound selected from 1,2-benzisothiazolin-3-one is 1 mg / L or more as an active ingredient concentration of the isothiazoline-based compound with respect to the amount of water retained in the cooling water system A process of adding to the cooling water system so as to be 20 mg / L or less, and
The method for treating an open circulating cooling water system according to any one of claims 1 to 5, wherein the treatment with the organic disinfectant is performed once every 2 to 30 days.
該有機系殺菌剤による処理を、２日間ないし３０日間に１回行うことを特徴とする請求項１ないし請求項５のいずれか１項に記載の開放循環冷却水系の処理方法。 The treatment with the organic disinfectant is a treatment of adding glutaraldehyde to the cooling water system such that the concentration of addition to the amount of water retained in the cooling water system is 20 mg / L or more and 500 mg / L or less as the active ingredient concentration, And,
The method for treating an open circulating cooling water system according to any one of claims 1 to 5, wherein the treatment with the organic disinfectant is performed once every 2 to 30 days.
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