JP7120523B2 - 水処理分離膜の製造方法およびこれにより製造された水処理分離膜 - Google Patents
水処理分離膜の製造方法およびこれにより製造された水処理分離膜 Download PDFInfo
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- JP7120523B2 JP7120523B2 JP2020519255A JP2020519255A JP7120523B2 JP 7120523 B2 JP7120523 B2 JP 7120523B2 JP 2020519255 A JP2020519255 A JP 2020519255A JP 2020519255 A JP2020519255 A JP 2020519255A JP 7120523 B2 JP7120523 B2 JP 7120523B2
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- water treatment
- separation membrane
- treatment separation
- aqueous solution
- chlorine
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- Separation Using Semi-Permeable Membranes (AREA)
Description
<実施例1>
DMF(N,N-ジメチルホルムアミド)に18wt%のポリスルホン固形分を入れて、80℃で12時間以上溶かして均一な液相を得た。この溶液をポリエステル材質の95μm~100μmの厚さの不織布上に150μmの厚さにキャスティングした。その後、キャスティングされた不織布を水に入れて多孔性ポリスルホン支持体を製造した。その後、全体水溶液の総重量を基準として5wt%のメタフェニレンジアミン(mPD)を含む水溶液を前記多孔性ポリスルホン支持体上に塗布して水溶液層を形成した。さらに、塗布時に発生した余分な水溶液をエアナイフを用いて除去した。前記水溶液層上に全体有機溶液の総重量を基準として0.3重量%のトリメソイルクロライド(TMC)および有機溶媒(IsoPar G)を含む有機溶液を塗布した。そして、95℃で液状成分がすべて蒸発するまで乾燥した後、純水(DIW)で洗浄して水処理分離膜を製造した。
実施例1において、臭素イオン200ppmの代わりに臭素イオン300ppmを含む水溶液を用いることを除けば、実施例1と同様の方法で水処理分離膜を製造した。
実施例1において、臭素イオン200ppmの代わりに臭素イオン400ppmを含む水溶液を用いることを除けば、実施例1と同様の方法で水処理分離膜を製造した。
実施例1において、遊離塩素と臭素イオンとを含む水溶液のpHを7超過に調節することを除けば、実施例1と同様の方法で水処理分離膜を製造した。
実施例2において、遊離塩素と臭素イオンとを含む水溶液のpHを7超過に調節することを除けば、実施例2と同様の方法で水処理分離膜を製造した。
実施例3において、遊離塩素と臭素イオンとを含む水溶液のpHを7超過に調節することを除けば、実施例3と同様の方法で水処理分離膜を製造した。
DMF(N,N-ジメチルホルムアミド)に18wt%のポリスルホン固形分を入れて、80℃で12時間以上溶かして均一な液相を得た。この溶液をポリエステル材質の95μm~100μmの厚さの不織布上に150μmの厚さにキャスティングした。その後、キャスティングされた不織布を水に入れて多孔性ポリスルホン支持体を製造した。その後、全体水溶液の総重量を基準として5wt%のメタフェニレンジアミン(mPD)を含む水溶液を前記多孔性ポリスルホン支持体上に塗布して水溶液層を形成した。さらに、塗布時に発生した余分な水溶液をエアナイフを用いて除去した。前記水溶液層上に全体有機溶液の総重量を基準として0.3重量%のトリメソイルクロライド(TMC)および有機溶媒(IsoPar G)を含む有機溶液を塗布した。そして、95℃で液状成分がすべて蒸発するまで乾燥した後、超純水蒸留水(DIW)で洗浄して水処理分離膜を製造した。
比較例1で製造した水処理分離膜を遊離塩素150ppmを含む水溶液に20秒間浸漬した。この時、水溶液のpHは7未満に調節した。この後、分離膜の表面を乾燥して水処理分離膜を製造した。
比較例2において、遊離塩素150ppmの代わりに遊離塩素300ppmを含む水溶液を用いることを除けば、比較例2と同様の方法で水処理分離膜を製造した。
比較例2において、遊離塩素150ppmの代わりに遊離塩素400ppmを含む水溶液を用いることを除けば、比較例2と同様の方法で水処理分離膜を製造した。
比較例2において、遊離塩素150ppmの代わりに臭素イオン150ppmを含む水溶液を用いることを除けば、比較例2と同様の方法で水処理分離膜を製造した。
比較例5において、臭素イオン150ppmの代わりに臭素イオン300ppmを含む水溶液を用いることを除けば、比較例5と同様の方法で水処理分離膜を製造した。
比較例5において、臭素イオン150ppmの代わりに臭素イオン400ppmを含む水溶液を用いることを除けば、比較例5と同様の方法で水処理分離膜を製造した。
比較例2において、遊離塩素を含む水溶液のpHを7超過に調節することを除けば、比較例2と同様の方法で水処理分離膜を製造した。
比較例3において、遊離塩素を含む水溶液のpHを7超過に調節することを除けば、比較例3と同様の方法で水処理分離膜を製造した。
比較例4において、遊離塩素を含む水溶液のpHを7超過に調節することを除けば、比較例4と同様の方法で水処理分離膜を製造した。
比較例5において、臭素イオンを含む水溶液のpHを7超過に調節することを除けば、比較例5と同様の方法で水処理分離膜を製造した。
比較例6において、臭素イオンを含む水溶液のpHを7超過に調節することを除けば、比較例6と同様の方法で水処理分離膜を製造した。
比較例7において、臭素イオンを含む水溶液のpHを7超過に調節することを除けば、比較例7と同様の方法で水処理分離膜を製造した。
比較例1で製造した水処理分離膜を遊離塩素75ppmおよび臭素イオン50ppmを含む水溶液に20秒間浸漬した。この時、水溶液のpHは7未満に調節した。この後、分離膜の表面を乾燥して水処理分離膜を製造した。
比較例14において、臭素イオン50ppmの代わりに臭素イオン100ppmを含む水溶液を用いることを除けば、比較例14と同様の方法で水処理分離膜を製造した。
比較例15において、遊離塩素75ppmの代わりに遊離塩素150ppmを含む水溶液を用いることを除けば、比較例15と同様の方法で水処理分離膜を製造した。
比較例1で製造した水処理分離膜を遊離塩素75ppmおよび臭素イオン200ppmを含む水溶液に20秒間浸漬した。この時、水溶液のpHは7未満に調節した。この後、分離膜の表面を乾燥して水処理分離膜を製造した。
比較例17において、遊離塩素および臭素イオンを含む水溶液のpHを7超過に調節することを除けば、比較例17と同様の方法で水処理分離膜を製造した。
前記実施例1~6および比較例1~18により製造された水処理分離膜に対して、32,000ppmのNaCl水溶液、5ppmのボロン酸水溶液を800psi、4.5L/minの流量で1時間程度装置運転を実施して安定化されたことを確認した後、25℃で10分間透過する水の量を測定して透過流量(flux:GFD(gallon/ft2/day))を計算し、導電度メーター(Conductivity Meter)を用いて透過前と後の塩濃度を分析して、塩除去率(Rejection)およびボロン除去率を計算した結果を下記表1に記載した。
200:多孔性支持層
300:ポリアミド活性層
400:塩水
500:精製水
600:濃縮水
Claims (10)
- 水処理分離膜のポリアミド活性層に遊離塩素および臭素イオンを含む水溶液を接触させるステップを含み、
前記水溶液を基準として、前記遊離塩素の含有量は150ppm~400ppmであり、前記臭素イオンの含有量は150ppm~400ppmであり、
水処理分離膜の表面の元素分析時、臭素元素の含有量が0.88at%以上4.7at%以下であり、塩素元素が検出されないか、塩素元素が検出される場合、塩素元素の含有量が0at%超過1at%以下であり、塩素元素に対する臭素元素の比(Br/Cl)が5~10である、水処理分離膜の製造方法。 - 前記遊離塩素および臭素イオンを含む水溶液のpHは4~11である、請求項1に記載の水処理分離膜の製造方法。
- 前記遊離塩素および臭素イオンを含む水溶液のpHは4~6である、請求項1に記載の水処理分離膜の製造方法。
- 前記遊離塩素および臭素イオンを含む水溶液のpHは9~11である、請求項1に記載の水処理分離膜の製造方法。
- 前記ポリアミド活性層に前記遊離塩素および臭素イオンを含む水溶液を接触させるステップは、5秒~5分間行われるものである、請求項1から4のいずれか一項に記載の水処理分離膜の製造方法。
- 水処理分離膜の表面の元素分析時、臭素元素の含有量が0.88at%以上4.7at%以下である水処理分離膜であって、
前記水処理分離膜は、ポリアミド活性層を備え、
前記水処理分離膜の表面の元素分析時、塩素元素が検出されないか、塩素元素が検出される場合、塩素元素の含有量が0at%超過1at%以下であり、塩素元素に対する臭素元素の比(Br/Cl)が5~10である水処理分離膜。 - 水処理分離膜の表面の元素分析時、臭素元素の含有量が0.88at%以上4.7at%以下であり、塩素元素の含有量が0.5at%以上0.6at%以下であり、塩素元素に対する臭素元素の比(Br/Cl)が6.3~9.4である、請求項6に記載の水処理分離膜。
- 水処理分離膜の表面の元素分析時、臭素元素の含有量が0.88at%以上4.7at%以下であり、塩素元素が検出されない、請求項6に記載の水処理分離膜。
- 請求項6から8のいずれか一項に記載の水処理分離膜を1つ以上含む水処理モジュール。
- 請求項9に記載の水処理モジュールを1つ以上含む水処理装置。
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