JP5814831B2 - 分離膜の製造方法 - Google Patents
分離膜の製造方法 Download PDFInfo
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- 229910052731 fluorine Inorganic materials 0.000 claims description 68
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- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
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- PJWWRFATQTVXHA-UHFFFAOYSA-N Cyclohexylaminopropanesulfonic acid Chemical compound OS(=O)(=O)CCCNC1CCCCC1 PJWWRFATQTVXHA-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
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- JZTPOMIFAFKKSK-UHFFFAOYSA-N O-phosphonohydroxylamine Chemical class NOP(O)(O)=O JZTPOMIFAFKKSK-UHFFFAOYSA-N 0.000 description 1
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- 229920001131 Pulp (paper) Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
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- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
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- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- IFQUWYZCAGRUJN-UHFFFAOYSA-N ethylenediaminediacetic acid Chemical compound OC(=O)CNCCNCC(O)=O IFQUWYZCAGRUJN-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
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- 239000012510 hollow fiber Substances 0.000 description 1
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
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- 238000000344 low-energy electron-beam lithography Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 239000012071 phase Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N phthalic anhydride Chemical compound C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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- RINCXYDBBGOEEQ-UHFFFAOYSA-N succinic anhydride Chemical compound O=C1CCC(=O)O1 RINCXYDBBGOEEQ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Description
(1−1)製造例1
厚み30μmのポリテトラフルオロエチレン(PTFE)膜をPET不織布に熱接合した積層体を電子線照射室に入れ、照射室内を窒素ガスで置換した。積層体のPTFE側表面に、電子線を照射電圧40keVで3MGyの照射線量で照射した。電子線照射後、積層体を空気に触れさせることなく、40℃に調整したグリシジルメタクリレートのメタノール溶液(グリシジルメタクリレート濃度:20容量%)に浸漬し、同温度で30分間保持した。その後積層体をイオン交換水で洗浄し、続いて、80℃のタウリン溶液(タウリン濃度:0.5M、溶媒:水/イソプロパノール=3/1(容量比)、pH9.0)に浸漬し、同温度で72時間保持した。その後積層体をイオン交換水で洗浄し、乾燥させることにより、スルホン酸基を導入したPTFE膜を得た。
製造例1において、PTFE膜表面に照射する電子線のエネルギー(照射電圧)を55keVに変えた以外は、製造例1と同様にしてスルホン酸基を導入したPTFE膜を得た。
製造例1において、PTFE膜表面に照射する電子線のエネルギー(照射電圧)を70keVに変えた以外は、製造例1と同様にしてスルホン酸基を導入したPTFE膜を得た。
製造例1において、PTFE膜表面に照射する電子線のエネルギー(照射電圧)を80keVに変えた以外は、製造例1と同様にしてスルホン酸基を導入したPTFE膜を得た。
製造例1において、PTFE膜表面に照射する電子線のエネルギー(照射電圧)を100keVに変えた以外は、製造例1と同様にしてスルホン酸基を導入したPTFE膜を得た。
(2−1)SEM観察
走査型電子顕微鏡(キーエンス社製、VE−8800)を用いて、製造例1〜5の電子線照射後のPTFE側表面を観察した。製造例1〜5で得られたそれぞれの膜のSEM写真を図1〜図5に示す。
製造例1〜5で得られた膜を20mmの幅で切り出し、引張試験機にチャック間隔40mmで固定し、引張速度15mm/分で引っ張ったときの引張強度を測定した。支持体として用いたPET不織布は異方性があるものであったため、引張強度は縦方向と横方向の2方向について測定した。
製造例1〜5で得られた膜のPTFE側表面に、スコッチ社製超強力両面テープSPS(19mm幅)を接着させ、ゆっくりと剥がした時の剥離の有無を調べた。
膜間差圧50kPa、20℃における膜面1cm2当りの1分間当りの透水量を測定した。
膜の物性の評価結果を表1に示す。PTFE膜に照射される電子線のエネルギー(照射電圧)が55keV〜80keVの製造例2〜4では、得られる膜の引張強度の低下がなく、テープ剥離試験での剥離も見られず、透水性も良好であった。また、図2〜図4から分かるように、製造例2〜4で得られた膜では膜の崩壊が確認されなかった。
下水を主成分とする事業所廃水を原水とし、膜分離活性汚泥法による連続試験を行った。分離膜は、製造例3で得られたPTFE膜にグリシジルメタクリレートを介してカチオン交換基としてタウリンを導入した膜(分離膜A)を用い、また対照膜として、表面を界面活性剤で親水化処理した塩素化ポリ塩化ビニル(CPVC)膜(分離膜B)を用いた。分離膜はそれぞれ縦315mm×横225mm×厚さ6mmのABS樹脂製ろ板の両面に溶着し、膜槽に鉛直に設置した。ろ板の間隔は8mmとした。分離膜の下部には散気装置を設け、散気装置によって活性汚泥に空気を供給することより、膜表面のクロスフロー洗浄を行いながら活性汚泥の固液分離を行った。膜槽内の活性汚泥濃度は9500mg/L〜11500mg/Lの範囲に維持し、処理水の膜透過流束が1.0m3/m2/日となるように、ろ板に設けた取水口経由で処理水側をポンプで9分オン−1分オフで間欠吸引した。曝気量は膜1枚当たり10L/分とした。膜槽内の活性汚泥量を一定に保つように、隣接浄化槽から活性汚泥を連続的に加えるとともに、槽内の活性汚泥を浄化槽にオーバーフローさせた。
Claims (5)
- 含フッ素樹脂膜にカチオン交換基が導入された固液分離膜の製造方法であって、
含フッ素樹脂膜に、電離放射線を55keV以上80keV以下のエネルギーで照射する工程と、
前記電離放射線が照射された前記含フッ素樹脂膜に、前記カチオン交換基を有する化合物をグラフト重合する、あるいは架橋性化合物をグラフト重合した後に前記カチオン交換基を有する化合物を架橋性化合物に結合させる工程を有することを特徴とする分離膜の製造方法。 - 前記含フッ素樹脂膜としてポリテトラフルオロエチレン膜を用いる請求項1に記載の分離膜の製造方法。
- 前記電離放射線として電子線を用いる請求項1または2に記載の分離膜の製造方法。
- 前記電離放射線の照射を不活性雰囲気下で行う請求項1〜3のいずれか一項に記載の分離膜の製造方法。
- 前記電離放射線を、電離放射線が透過可能なエネルギー吸収材を介して前記含フッ素樹脂膜に照射し、前記含フッ素樹脂膜に照射される電離放射線のエネルギーを調整する請求項1〜4のいずれか一項に記載の分離膜の製造方法。
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