JP4433781B2 - 循環式冷却水系の水処理剤及びその使用方法 - Google Patents
循環式冷却水系の水処理剤及びその使用方法 Download PDFInfo
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- JP4433781B2 JP4433781B2 JP2003414382A JP2003414382A JP4433781B2 JP 4433781 B2 JP4433781 B2 JP 4433781B2 JP 2003414382 A JP2003414382 A JP 2003414382A JP 2003414382 A JP2003414382 A JP 2003414382A JP 4433781 B2 JP4433781 B2 JP 4433781B2
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- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims description 5
- 239000004480 active ingredient Substances 0.000 claims description 5
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Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
Description
藻類の繁殖は、配管の閉塞や熱交換率の低下等の障害を引起こし、また微生物の繁殖では、菌体からの分泌物が水系の浮遊物等を取込み、最終的にはスライムと呼ばれる粘状物質が同様な障害を引起こすまでに至る。
(1)BIMTとZPTとを有効成分とすることを特徴とする循環式冷却水系用水処理剤、
(2)(1)項に記載の水処理剤が、1,1−ジホスホン酸、1−ヒドロキシエチリデンー1,1−ジホスホン酸、エチレンジアミンテトラ(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチルホスホン酸)、アミノトリ(メチルホスホン酸)、2−ホスホノブタンー1,2,4−トリカルボン酸及びそのナトリウム塩又はカルシウム塩、ポリリン酸ナトリウム、ポリアクリル酸及びポリマレイン酸よりなる群から選ばれる少なくも1種以上を含有していることを特徴とする(1)項記載の水処理剤、
(3)レジオネラ属菌の生息する循環式冷却水系に、(1)項又は(2)項に記載の水処理剤を添加することを特徴とするレジオネラ属菌の繁殖抑制方法、
(4)該循環式冷却水系が、pH7.5〜9.5の系である(3)項記載の抑制方法、
より異なり適宜選択するが、この範囲を超えて使用することに特に問題はない。
また、本発明の水処理剤、及びその使用方法には、他の殺菌剤、殺藻剤を配合して使用することもできる。これらの薬剤としては、イソチアゾロン系化合物、ブロモニトロアルコール系化合物、例えば、2−ブロモ−2−ニトロプロパン−1,3−ジオール等が挙げられる。
BIMT 10部、ZPT 3部、ノニポール95(三洋化成工業株式会社製、ポリオキシエチレンノニルフェニルエーテル)2部及びN−メチル−2−ピロリジノン 85部を混合して液剤を得た。
BIMT 5部、ZPT 5部、1−ヒドロキシエチリデン−1,1−ジホスホン酸(純度60%)40部、ジエチレングリコールモノメチルエーテル 46部及びポリビニルアルコール 3部及びノニポール95 1部を混合し液剤を得た。
BIMT 2部、ZPT 5部、エチレンジアミンテトラ(メチレンホスホン酸)(純度90%)50部、N−メチル−2−ピロリジノン 40部及びポリビニルアルコール 3部を混合し液剤を得た。
BIMT 20部、ZPT 15部、カオリン 60部、アラビアゴム 1部及び水150部を混合し、湿式造粒し、乾燥して水分含量4%の直径1.5mm、長さ4mmの顆粒剤を得た。
BIMT 25部、ZPT 30部、1−ヒドロキシエチリデン−1,1−ジホスホン酸(純度60%)30部、カルボキシメチルセルロース 2部、カオリン 8部及び水180部を混合し、湿式造粒し、乾燥して水分含量5%の直径1.5mm、長さ4mmの顆粒剤を得た。
BIMT 25部、ZPT 15部、エチレンジアミンテトラ(メチレンホスホン酸)(純度90%}4部、ジエチレングリコール3部、カルボキシメチルセルロース 1部、SBR系ラテックス 5部、ステアリン酸マグネシウム 6部及び水 180部を混合し、湿式造粒し、乾燥して水分含量5%の直径1.5mm、長さ4mmの顆粒剤を得た。更に、打錠機により圧縮成型し直径30mm、長さ15mm、重量12gの錠剤を得た。
BIMT 10部及びN−メチル−2−ピロリジノン 90部を混合し液剤を得た。
ZPT 3部及びN−メチル−2−ピロリジノン 97部を混合し液剤を得た。
緑藻クロレラ・ブルガリス(Chlorella vulgalis)C−135株をpH8.5の硝酸カリウム1000ppm、硫酸マグネシウム(7水和物)250ppm、リン酸水素二カリウム250ppm、塩化ナトリウム100ppm、塩化カルシウム10ppm、硫酸鉄(7水和物)1ppm、ホウ酸2.86ppm、硫酸マンガン(7水和物)2.5ppm、硫酸亜鉛0.22ppm、硫酸銅0.08ppm、モリブデン酸ナトリクム0.02ppmの組成からなるModified DETMER培地(以下、MD培地という)で、4週間前培養した後、MD培地で4倍に希釈した。この緑藻希釈液100mlに、所定の有効成分濃度になるように薬剤を投入し、照明付きの恒温槽(25℃、蛍光灯照明8時間、9000Lux)で14日間培養した。藻に対する効力評価は、目視で行った。なお、薬効の持続性を確認するため、培養開始7日後の目視観察の後、新たにMD培地で2倍希釈した緑藻希釈液100mlを追加添加した。試験結果を表1に示す。
表中の記号は、下記を意味する。
W:藻が白化し死滅したこと意味する。
L:藻が白化まで至らないが緑色が退化した状態でやがて死滅に至ることを示す
。
G:藻が培養初期と変わらない緑色を呈し、殺藻効果を示さなかったことを意味
する。
M:藻の追加添加又は生育により緑藻が増殖し培養初期の色調より濃くなったこ
とを意味する。
レジオネラ菌(Legionella pneumophila ATCC33153)をLCYE(Legionella CYEagar)平板培地(pH7、組成、活性炭0.18%、酵母抽出物0.19%、寒天1.2%、残部、水酸化カリウム100ppm、α−ケトグルタル酸10ppm、L−システイン塩酸塩4ppm、ピロリン酸2.5ppm)を用い、37℃で3日間前培養を行い、コロニーを培地表面より掻き取り、107〜108CFU/mlとなるようにリン酸緩衝液(pH8.5)で希釈し菌体液を調製した。この菌体液を、某化学工場より入手した冷凍機循環水(pH8.5、レジオネラ属細菌数10CFU/ml以下、一般細菌数5.0×102CFU/ml)に約1%添加し試験液を調製した。フラスコに試験液100mlをとり、所定の有効成分濃度になるように薬剤を投入し、37℃で14日間振とう培養し、経時的にレジオネラ菌の生菌数を測定した。試験結果を表2に示す。なお、製剤例6は、成型前の顆粒の状態で試験した。生菌数は、CFU/mlで表示した。
Nutrient broth(組成、肉エキス0.5%、塩化ナトリウム0.5%、ペプトン1%)を蒸留水で10倍に希釈し、pH7.8の培地を調製し、前培養した細菌(Pseudomonas fluorescens JCM2779)を0.1%接種した。これに所定の有効成分濃度になるように薬剤を投入して試験液とした。横2cm、縦5cmのSUS314試験片を入れたポリ容器に、試験液を注ぎ、30℃で、スタラーで緩く撹拌しながら4週間培養した。
1週間ごとに、前培養した当該菌体を0.1%再添加し、4週間後に、試験片を取出し、軽く水洗して目視によりスライム性の粘状付着物の有無を観察した。試験結果を表3に示す。なお、製剤例6は、成型前の顆粒の状態で試験に供した。表中の記号は下記を意味する。
−:付着物のないこと。
±:付着物が僅かにあること。
+:付着物があること。
Claims (4)
- 4,6−ビス(イソプロピルアミノ)−2−メチルチオ−1,3,5−トリアジンと、2−ピリジンチオール−1−オキシド亜鉛塩とを有効成分とすることを特徴とする循環式冷却水系用水処理剤。
- 請求項1に記載の水処理剤が、1,1−ジホスホン酸、1−ヒドロキシエチリデンー1,1−ジホスホン酸、エチレンジアミンテトラ(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチルホスホン酸)、アミノトリ(メチルホスホン酸)、2−ホスホノブタンー1,2,4−トリカルボン酸及びそのナトリウム塩又はカルシウム塩、ポリリン酸ナトリウム、ポリアクリル酸及びポリマレイン酸よりなる群から選ばれる少なくも1種以上を含有していることを特徴とする請求項1記載の水処理剤。
- レジオネラ属菌の生息する循環式冷却水系に、請求項1又は2に記載の水処理剤を添加することを特徴とするレジオネラ属菌の繁殖抑制方法。
- 該循環式冷却水系が、pH7.5〜9.5の系である、請求項3記載の抑制方法。
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