JPH01254287A - Method for preventing generation of bacteria in recirculation aqueous system - Google Patents
Method for preventing generation of bacteria in recirculation aqueous systemInfo
- Publication number
- JPH01254287A JPH01254287A JP8140888A JP8140888A JPH01254287A JP H01254287 A JPH01254287 A JP H01254287A JP 8140888 A JP8140888 A JP 8140888A JP 8140888 A JP8140888 A JP 8140888A JP H01254287 A JPH01254287 A JP H01254287A
- Authority
- JP
- Japan
- Prior art keywords
- bacteria
- circulating water
- water
- ultraviolet rays
- recirculation water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 241000894006 Bacteria Species 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000460 chlorine Substances 0.000 claims abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 4
- 230000001580 bacterial effect Effects 0.000 claims abstract 4
- 241000589248 Legionella Species 0.000 claims description 7
- 208000007764 Legionnaires' Disease Diseases 0.000 claims description 4
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000645 desinfectant Substances 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 239000003139 biocide Substances 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 abstract description 2
- 239000013043 chemical agent Substances 0.000 abstract 4
- 230000000644 propagated effect Effects 0.000 abstract 2
- 230000003134 recirculating effect Effects 0.000 abstract 1
- 230000001954 sterilising effect Effects 0.000 description 14
- 238000004659 sterilization and disinfection Methods 0.000 description 11
- 238000004140 cleaning Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000003242 anti bacterial agent Substances 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 2
- NIFDAHUNJVFZAY-UHFFFAOYSA-N 1-nitropropane-1,3-diol Chemical compound OCCC(O)[N+]([O-])=O NIFDAHUNJVFZAY-UHFFFAOYSA-N 0.000 description 1
- UUIVKBHZENILKB-UHFFFAOYSA-N 2,2-dibromo-2-cyanoacetamide Chemical compound NC(=O)C(Br)(Br)C#N UUIVKBHZENILKB-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 241000589242 Legionella pneumophila Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 206010054161 Pontiac fever Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229940077239 chlorous acid Drugs 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 229940115932 legionella pneumophila Drugs 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- MWNQXXOSWHCCOZ-UHFFFAOYSA-L sodium;oxido carbonate Chemical compound [Na+].[O-]OC([O-])=O MWNQXXOSWHCCOZ-UHFFFAOYSA-L 0.000 description 1
- DKKUETPCPYRXSW-UHFFFAOYSA-N tetraoxetane Chemical class O1OOO1 DKKUETPCPYRXSW-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は冷凍装置の冷却用水などの循環水系中に発生す
る細菌類の増殖を防止する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing the growth of bacteria occurring in a circulating water system such as cooling water of a refrigeration system.
空調設備や冷蔵あるいは冷凍庫などに採用される冷凍装
置においては、熱交換を効率的に行なうために冷却水を
利用することが多い。かかる冷却水は水資源節約のため
にたとえば開放型の冷却塔などを用いて大気と接触させ
、水の蒸発潜熱によって顕熱を除去して循環使用される
ものが大部分である。かかる循環水系では外部から微生
物などが入り込んで増殖し易く、水使用量節減のために
飛散損失を抑制したりブローダウン量を減少したりする
と、循環水中の塩類や有機物などが濃縮するために種々
の障害が発生し易くなっている。Refrigeration equipment used in air conditioning equipment, refrigerators, freezers, etc. often uses cooling water to efficiently exchange heat. In order to conserve water resources, most of the cooling water is brought into contact with the atmosphere using, for example, an open cooling tower, and the sensible heat is removed by the latent heat of evaporation of the water for circulation. In such circulating water systems, it is easy for microorganisms to enter from the outside and multiply, and if we suppress scattering loss or reduce the amount of blowdown to reduce water usage, various problems occur due to the concentration of salts and organic substances in the circulating water. failures are becoming more likely to occur.
かかる障害としては、微生物群によって発生したスライ
ムが熱交換器に付着して熱交換効率を低下させることが
知られているが、近年になって循環水系中で増殖した細
菌とくにレジオネラ属細菌などが冷却塔から水と共に飛
散し、これが空調用空気などを介して人に取り込まれて
特殊な肺炎たとえば在郷軍人病やポンテアツク熱のよう
な病気が集団発生するなど、社会的な問題も起っている
。It is known that this problem is caused by slime generated by microorganisms that adheres to heat exchangers and reduces heat exchange efficiency, but in recent years, bacteria that have proliferated in circulating water systems, especially bacteria of the genus Legionella, have become Social problems can also occur, such as when the air is dispersed with water from cooling towers and taken into people through air conditioners, causing outbreaks of special types of pneumonia such as veterans' disease and Pontiac fever. There is.
このような問題の対策として、従来循環水系に抗菌剤を
注入して細菌類の増殖を抑制する方法や、装置内を機械
的に清掃洗浄しあるいは洗浄剤を用いて洗浄する方法な
どが用いられていた。Conventional countermeasures for these problems include methods of injecting antibacterial agents into the circulating water system to suppress the growth of bacteria, and methods of mechanically cleaning the inside of the equipment or using cleaning agents. was.
前述のような、循環水系における細菌類の増殖防止のた
めの従来の方法では、強力な抗菌剤を常時高濃度で使用
しでおり、飛散などによって環境を汚染するのみならず
経済的でない。また、薬剤を用いない細菌類の増殖防止
法としては紫外線により循環水を殺菌する方法があるが
循環水の全量を処理しようとすると装置が大がかりにな
り経済的でない。そして循環水の一部を紫外線により殺
菌処理する場合は充分な除菌効果が得られない。In the conventional method for preventing the growth of bacteria in a circulating water system, as described above, a strong antibacterial agent is constantly used at a high concentration, which not only contaminates the environment due to scattering but also is not economical. Furthermore, as a method for preventing the growth of bacteria without using chemicals, there is a method of sterilizing circulating water with ultraviolet rays, but if the entire amount of circulating water is to be treated, the equipment becomes large-scale and is not economical. When a portion of the circulating water is sterilized using ultraviolet rays, a sufficient sterilization effect cannot be obtained.
また、従来方法によって装置内を殺菌洗浄して完全に除
菌しても、場合によっては１０日前後、長くとも１ケ月
以内に洗浄前の菌数あるいはそれ以上に達するため、せ
いぜい２週間程度の間隔で洗浄を繰返す必要があり、装
置の稼働効率が悪いのみならず保守経費が嵩む。In addition, even if the inside of the device is completely sterilized by sterilization cleaning using conventional methods, the number of bacteria will reach the pre-cleaning level or higher within about 10 days, or within a month at the most, so it will take about two weeks at most. It is necessary to repeat cleaning at intervals, which not only reduces the operating efficiency of the equipment but also increases maintenance costs.
そこで、循環水系内の細菌類の増殖を環境を汚染するこ
となく効率的に抑制できる経済的な方法が求められてお
り、本発明はかかる要望に応えうる細菌発生防止法を提
供しようとするものである。Therefore, there is a need for an economical method that can efficiently suppress the proliferation of bacteria in a circulating water system without contaminating the environment, and the present invention seeks to provide a method for preventing the occurrence of bacteria that can meet this demand. It is.
本発明者らは前記の目的を達するために、種々の抗菌剤
や殺菌装置およびその使用方法について研究を行なって
いたところ、循環水系を一旦洗浄した後、循環水の少な
（とも一部に波長２５４ｎｍの紫外線を照射する方法を
採ると、抗菌剤を添加する際に生じる環境汚染をひきお
こすことなく、紫外線照射単独の場合にくらべて格段に
効果的に細菌の増殖を抑制できることを発見し、本発明
を完成した。In order to achieve the above object, the present inventors were conducting research on various antibacterial agents, sterilizers, and their usage methods. We discovered that irradiation with 254 nm ultraviolet rays can suppress the growth of bacteria much more effectively than irradiation with ultraviolet rays alone, without causing the environmental pollution that occurs when adding antibacterial agents. Completed the invention.
すなわち、本発明の循環水系の細菌発生防止法は、細菌
類が増殖した循環水系に対して該細菌類を殺滅するに足
る薬剤を添加して系内を循環させ洗浄したのち、循環水
の少なくとも一部に波長２５４ｎｍの紫外線を照射する
ことを特徴とするものである。In other words, the method for preventing the generation of bacteria in a circulating water system of the present invention involves adding a chemical sufficient to kill bacteria to a circulating water system in which bacteria have proliferated, and then cleaning the circulating water system by circulating the system. It is characterized in that at least a portion thereof is irradiated with ultraviolet light having a wavelength of 254 nm.
本発明において循環水系中の細菌類を殺滅するための薬
剤としては、たとえば塩酸、硫酸、硝酸、スルファミン
酸、フッ化水素酸などの水のｐＨを２以下となしうる酸
、たとえば塩素ガス、亜塩素酸またはその塩、次亜塩素
酸またはその塩、安定化二酸化塩素などの遊離塩素を発
生しうる塩素系物質、たとえば過酸化水素、過酢酸また
はその塩、過炭酸またはその塩、モノペルオキシフタル
酸またはその塩などの酸化力を有する過酸化物、さらに
また、たとえばグルタルアルデヒド、２−ブロモ−２−
ニトロプロパン−１，３−ジオール、２．２−ジブロモ
−３−ニトリロ−プロピオンアミドなどの有機殺菌剤か
ら選択されたものが用いられる。使用に際しては、これ
らの薬剤のうちがら適宜選択したものを単独で、あるい
は２種以上組合わせて用いることができる。薬剤の使用
量は、それぞれの薬剤によって異るが、水中濃度が細菌
類を殺滅しうる程度であることが必要であり、たとえば
塩酸などの酸を用いるときは、ｐＨが２．０以下となる
までの量を循環水中に添加する必要がある。In the present invention, agents for killing bacteria in the circulating water system include acids that can reduce the pH of water to 2 or less, such as hydrochloric acid, sulfuric acid, nitric acid, sulfamic acid, and hydrofluoric acid, such as chlorine gas, Chlorine-based substances that can generate free chlorine such as chlorous acid or its salts, hypochlorous acid or its salts, stabilized chlorine dioxide, such as hydrogen peroxide, peracetic acid or its salts, percarbonate or its salts, monoperoxy Peroxides with oxidizing power such as phthalic acid or its salts, and also, for example, glutaraldehyde, 2-bromo-2-
Organic fungicides selected from nitropropane-1,3-diol, 2,2-dibromo-3-nitrilo-propionamide, etc. are used. When used, appropriately selected drugs from these drugs can be used alone or in combination of two or more. The amount of the drug used varies depending on each drug, but it is necessary that the concentration in the water is at a level that can kill bacteria. For example, when using an acid such as hydrochloric acid, the pH should be 2.0 or less. It is necessary to add the amount to the circulating water until the
かかる薬剤を必要な濃度となるまで添加した水は、たと
えば熱交換器、冷却塔などの機器や配管等へ充分ゆき渡
るようにポンプなどを用いて循環し、装置内部に付着し
たスライムなどを剥離する。The water to which such chemicals have been added to the required concentration is circulated using a pump, etc., so that it is sufficiently distributed to equipment such as heat exchangers and cooling towers, and piping, etc., to peel off slime etc. that have adhered to the inside of the equipment. do.
そして装置内の汚れた水は排出し清水で置換する。The dirty water inside the device is then drained and replaced with clean water.
その後、循環水の少なくとも一部を紫外線殺菌装置に導
き、波長２５４ｎｍの紫外線で５ｍＷ−８／ｄ以上の照
射量をもって殺菌した後、再び循環水系に戻す。循環水
の取り出しは多くの場合冷却塔の下部水槽から行ない、
紫外線により殺菌された循環水は再び下部水槽に戻され
る。この際、紫外線の照射量が５ｍＷ−８／ｃｄより低
いときは、殺菌が不完全となり好ましくない。Thereafter, at least a portion of the circulating water is led to an ultraviolet sterilizer, where it is sterilized with ultraviolet rays with a wavelength of 254 nm at an irradiation dose of 5 mW-8/d or more, and then returned to the circulating water system. In most cases, circulating water is extracted from the lower water tank of the cooling tower.
The circulating water that has been sterilized by ultraviolet light is returned to the lower water tank. At this time, if the amount of ultraviolet irradiation is lower than 5 mW-8/cd, sterilization will be incomplete, which is not preferable.
また、循環水の全量を紫外線殺菌する場合は、循環水の
配管途中に紫外線殺菌装置を取り付ける方法が採られる
。In addition, when the entire amount of circulating water is to be sterilized by ultraviolet rays, a method is adopted in which an ultraviolet sterilizer is installed in the middle of the circulating water piping.
紫外線殺菌装置を通過させる水量は、系内の循環水流量
の少なくとも５％とするのがよい。通過水量を多くする
ほど循環水中の細菌の増殖を抑制する効果を大きいが、
設備費や運転費も多くかかってくるので、循環水の一部
を処理する場合は、全循環水流量の１０〜２０％の範囲
であることが望ましい。The amount of water passed through the UV sterilizer should be at least 5% of the circulating water flow rate in the system. The larger the amount of water passing through, the greater the effect of suppressing the growth of bacteria in the circulating water.
Since equipment costs and operating costs are high, when a portion of the circulating water is treated, it is desirable that the amount be in the range of 10 to 20% of the total circulating water flow rate.
本発明の方法に従って循環水系を洗浄し、除菌したのち
循環水の少なくとも一部の紫外線殺菌を継続すると、長
期間にわたって循環水系の細菌類の発生を防止しうる。If the circulating water system is cleaned and sterilized according to the method of the present invention and then UV sterilization of at least a portion of the circulating water is continued, the generation of bacteria in the circulating water system can be prevented for a long period of time.
これに対して、循環水系を除菌洗浄せずに紫外線照射の
みで細菌類を殺菌しようとしても全循環水流量の４０％
の流量の水に対して紫外線照射した場合でも細菌類の減
少率は８０％程度に止まり、大量の水を殺菌処理してい
るため、設備費、動力費、紫外線ランプの電力等の費用
が嵩んで不経済であるうえに、細菌類の飛散を止めるこ
とができない。On the other hand, even if the circulating water system is not disinfected and cleaned and bacteria are sterilized by UV irradiation alone, only 40% of the total circulating water flow will be used.
Even when UV irradiation is applied to water at a flow rate of Not only is this uneconomical, but it also cannot prevent the spread of bacteria.
いわゆる在郷軍人病の病原菌であるレジオネラ属細菌（
Ｌｅｇｉｏｎｅｌｌａ Ｐｎｅｕｍｏｐｈｉｌａ）で
汚染された空調用冷却水系を選定し、循環水中にグルタ
ルアルデヒドを約３００ｍｇ／ｊ！となるように添加し
て２時間循環したのち剥離したスライム等を含む水を排
出し、ついで清水を注入しながら系内を循環させて順次
置換した。Bacteria of the genus Legionella (
An air conditioning cooling water system contaminated with Legionella Pneumophila was selected, and about 300 mg/j of glutaraldehyde was added to the circulating water! After the water was added and circulated for 2 hours, the water containing the exfoliated slime and the like was discharged, and then the system was circulated while injecting clean water to sequentially replace the water.
このようにして除菌洗浄した冷却水系に対し、全循環水
流量の１７％に相当する水の流量を紫外線殺菌装置に導
き、これに１０ｍＷ−ｓ／ｃｄの紫外線照射を行ない再
び循環水系に戻す運転を継続した。（試験Ｉ）
また比較のために除菌洗浄をせずに、全循環水流量の４
０％に相当する水の流量を紫外線殺菌し、再び循環水系
に戻す運転を継続した試験（試験■）と、系内を前記同
様の方法で除菌洗浄、置換した後、紫外線殺菌を行なわ
ずに運転を継続した試験（試験■）と、系内を前記同様
に除菌洗浄、置換した後、全循環水流量の３％に相当す
る水の流量を紫外線殺菌し、再び循環水系に戻す運転を
継続した試験（試験■）とを行ない、これらの結果を第
１図に示した。For the cooling water system that has been sterilized and cleaned in this way, a flow rate of water equivalent to 17% of the total circulating water flow rate is led to an ultraviolet sterilizer, where it is irradiated with ultraviolet light at 10 mW-s/cd and returned to the circulating water system. Continued driving. (Test I) For comparison, the total circulating water flow rate was 4.
A test (test ■) in which the flow rate of water equivalent to 0% was sterilized by ultraviolet rays and returned to the circulating water system was continued (test ■), and the inside of the system was sterilized and cleaned using the same method as above, and the water was replaced, but no sterilization by ultraviolet rays was performed. (Test ■) where the system was sterilized and cleaned and replaced in the same manner as above, the water flow equivalent to 3% of the total circulating water flow was sterilized by ultraviolet rays, and the water was returned to the circulating water system again. A continuous test (test ■) was conducted, and the results are shown in FIG.
図は菌数の変化を示すグラ′フであって横軸は連続運転
の経過日数、縦軸は循環水中の生存レジオネラ属細菌の
量を菌数の対数値（ｌｏｇ（個数／１００ｍｆ））で表
わした菌数指標である。The figure is a graph showing changes in the number of bacteria. The horizontal axis is the number of days of continuous operation, and the vertical axis is the amount of living Legionella bacteria in the circulating water as a logarithm of the number of bacteria (log (number/100 mf)). This is an index of the number of bacteria expressed.
この結果をみると、全循環水流量の４０％に対 ４して
紫外線殺菌を行なってもレジオネラ属細菌ははかばかし
く減少しない。These results show that even if UV sterilization is applied to 40% of the total circulating water flow rate, Legionella bacteria do not decrease dramatically.
一方、除菌洗浄を行なっただけでは１ケ月後には再び除
菌前の状態に戻り、また除菌洗浄後、全循環水流量の３
％を紫外線殺菌した場合も殺菌しない場合と同様に、１
ケ月後には除菌前の状態に戻る。これに対し、系内を除
菌洗浄後、全循環水流量の１７％に対して紫外線殺菌す
ると、２ケ月後であっても有効にレジオネラ属細菌の生
育が抑制されることがわかる。On the other hand, if only sterilization cleaning is performed, the state will return to the state before sterilization after one month, and after sterilization cleaning, 3 of the total circulating water flow rate will be reduced.
% when sterilized by ultraviolet rays as well as when not sterilized.
After several months, it will return to its pre-sterilization state. On the other hand, it can be seen that after sterilizing and cleaning the inside of the system, UV sterilization was applied to 17% of the total circulating water flow rate, and the growth of Legionella bacteria was effectively suppressed even after 2 months.
本発明の循環水系の細菌発生防止法は、循環水系の細菌
類の増殖を抑制するに当って一旦除菌洗浄し、その後は
循環水流量の少なくとも５％を紫外線照射することによ
り長期間にわたって細菌の発生を防止できるものであり
、殺菌剤を継続的に使用しない。従って、細菌による環
境汚染と殺菌剤による環境汚染とをいづれも軽減でき、
しがも経済的であるという特長を有する。The method for preventing the generation of bacteria in a circulating water system of the present invention is to suppress the growth of bacteria in a circulating water system by first sterilizing and cleaning the system, and then irradiating at least 5% of the circulating water flow rate with ultraviolet rays to keep bacteria in the circulating water system for a long period of time. , and do not use disinfectants continuously. Therefore, both environmental pollution caused by bacteria and disinfectants can be reduced.
It also has the advantage of being economical.
第１図は空調用冷却水系におけるレジオネラ菌の生存菌
数の経時変化の例を示すグラフである。FIG. 1 is a graph showing an example of changes over time in the number of viable Legionella bacteria in an air conditioning cooling water system.
Claims (5)
滅するに足る薬剤を添加して系内を循環させ洗浄したの
ち、循環水の少なくとも一部に波長２５４ｎｍの紫外線
を照射することを特徴とする循環水系の細菌発生防止法
。(1) Add a chemical sufficient to kill bacteria to a circulating water system in which bacteria have grown, circulate the system and clean it, and then irradiate at least a portion of the circulating water with ultraviolet rays with a wavelength of 254 nm. A method for preventing the occurrence of bacteria in a circulating water system.
しうる酸、遊離塩素を発生しうる塩素系物質、酸化力を
有する過酸化物、ならびにグルタルアルデヒド、２−ブ
ロモ−２−ニトロプロパン−１，３−ジオール、２，２
−ジブロモ−３−ニトリロ−プロピオンアミドなどの有
機殺菌剤から選択されたものである、特許請求の範囲第
１項記載の細菌発生防止法。(2) Bacteria-killing agents include acids that can reduce the pH of water to 2 or less, chlorine-based substances that can generate free chlorine, peroxides that have oxidizing power, and glutaraldehyde and 2-bromo-2. -nitropropane-1,3-diol, 2,2
The method of preventing bacterial outbreak according to claim 1, which is selected from organic disinfectants such as -dibromo-3-nitrilo-propionamide.
り出し、紫外線殺菌器に導入し、紫外線殺菌器内に於い
て波長２５４ｎｍの紫外線を５ｍＷ・ｓ／ｃｍ＾２以上
の照射量で与えたのち系内に戻すものである、特許請求
の範囲第１項または第２項のいずれかに記載の細菌発生
防止法。(3) Take out the circulating water from the lower water tank of the cooling tower or the circulating water piping, introduce it into the ultraviolet sterilizer, and apply ultraviolet rays with a wavelength of 254 nm at an irradiation amount of 5 mW・s/cm^2 or more in the ultraviolet sterilizer. The method for preventing the generation of bacteria according to claim 1 or 2, which is a method that is subsequently returned to the system.
して少なくとも５％である、特許請求の範囲第１項から
第３項までのいずれかに記載の細菌発生防止法。(4) The method for preventing bacterial generation according to any one of claims 1 to 3, wherein the flow rate of water to which ultraviolet rays are irradiated is at least 5% of the total circulating water flow rate.
、特許請求の範囲第１項から第４項までのいずれかに記
載の細菌発生防止法。(5) The method for preventing bacterial outbreak according to any one of claims 1 to 4, wherein the bacteria include bacteria of the genus Legionella.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081408A JPH0677735B2 (en) | 1988-04-04 | 1988-04-04 | Prevention method of Legionella spp. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081408A JPH0677735B2 (en) | 1988-04-04 | 1988-04-04 | Prevention method of Legionella spp. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01254287A true JPH01254287A (en) | 1989-10-11 |
| JPH0677735B2 JPH0677735B2 (en) | 1994-10-05 |
Family
ID=13745506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63081408A Expired - Lifetime JPH0677735B2 (en) | 1988-04-04 | 1988-04-04 | Prevention method of Legionella spp. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677735B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07171575A (en) * | 1993-12-21 | 1995-07-11 | Hakuto Co Ltd | Sterilization treatment method in water system |
| JP2004160379A (en) * | 2002-11-14 | 2004-06-10 | Miura Co Ltd | Pure water production apparatus |
| WO2009104707A1 (en) * | 2008-02-21 | 2009-08-27 | 栗田工業株式会社 | Method for disinfection of aqueous systems |
| CN105502777A (en) * | 2016-01-25 | 2016-04-20 | 国家海洋局天津海水淡化与综合利用研究所 | Cooling tower slime stripping method |
| CN113562897A (en) * | 2020-04-29 | 2021-10-29 | 无锡蓝湾资源再生科技有限公司 | Industrial reclaimed water sterilization system |
| CN115745323A (en) * | 2022-12-12 | 2023-03-07 | 浙江浙能技术研究院有限公司 | Thermal power plant circulating cooling water microorganism control system and operation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6125688A (en) * | 1984-07-13 | 1986-02-04 | Hitachi Plant Eng & Constr Co Ltd | Sterilizing method in germfree water manufacturing apparatus |
| JPS627497A (en) * | 1985-07-03 | 1987-01-14 | Hitachi Ltd | Washing apparatus of pure water making apparatus |
-
1988
- 1988-04-04 JP JP63081408A patent/JPH0677735B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6125688A (en) * | 1984-07-13 | 1986-02-04 | Hitachi Plant Eng & Constr Co Ltd | Sterilizing method in germfree water manufacturing apparatus |
| JPS627497A (en) * | 1985-07-03 | 1987-01-14 | Hitachi Ltd | Washing apparatus of pure water making apparatus |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07171575A (en) * | 1993-12-21 | 1995-07-11 | Hakuto Co Ltd | Sterilization treatment method in water system |
| JP2004160379A (en) * | 2002-11-14 | 2004-06-10 | Miura Co Ltd | Pure water production apparatus |
| WO2009104707A1 (en) * | 2008-02-21 | 2009-08-27 | 栗田工業株式会社 | Method for disinfection of aqueous systems |
| CN105502777A (en) * | 2016-01-25 | 2016-04-20 | 国家海洋局天津海水淡化与综合利用研究所 | Cooling tower slime stripping method |
| CN105502777B (en) * | 2016-01-25 | 2018-03-13 | 国家海洋局天津海水淡化与综合利用研究所 | A kind of cooling tower slimes dispersant method |
| CN113562897A (en) * | 2020-04-29 | 2021-10-29 | 无锡蓝湾资源再生科技有限公司 | Industrial reclaimed water sterilization system |
| CN115745323A (en) * | 2022-12-12 | 2023-03-07 | 浙江浙能技术研究院有限公司 | Thermal power plant circulating cooling water microorganism control system and operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0677735B2 (en) | 1994-10-05 |
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