JP7072175B2 - 水処理用流路材 - Google Patents
水処理用流路材 Download PDFInfo
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- JP7072175B2 JP7072175B2 JP2019562185A JP2019562185A JP7072175B2 JP 7072175 B2 JP7072175 B2 JP 7072175B2 JP 2019562185 A JP2019562185 A JP 2019562185A JP 2019562185 A JP2019562185 A JP 2019562185A JP 7072175 B2 JP7072175 B2 JP 7072175B2
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- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
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- Inorganic Chemistry (AREA)
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Description
海水、廃水等の処理対象となる原水には、一般的に、有機成分(例えば、タンパク質、多糖類、腐植酸等)、無機成分(カルシウムイオン、ナトリウムイオン等のイオン又は塩)、又は有機無機の複合成分等が含まれている。そのため、上記のような、膜分離装置を、長期間に亘って使用すると、上記原水スペーサーの周りに、有機成分や無機成分等が付着及び堆積する現象(所謂、ファウリング)が発生する。
前記課題を解決するための手段は、以下の通りである。即ち、
<1> 合成樹脂と、ナノカーボン材料とを含む成形品からなる水処理用流路材。
本願発明によれば、ファウリングの発生が抑制された水処理用流路材を提供することができる。
図1に示されるように、平面視で円形状をなしたメッシュ状のスペーサー(水処理用流路材)を用意した。実施例1のスペーサー1は、ポリプロピレン樹脂100質量部に対して、カーボンナノチューブを18質量部配合した組成物を、所定の金型を利用して成形した成形品からなる。実施例1におけるスペーサー1のメッシュ部の各寸法は、図2に示される通りである。
図1に示されるように、実施例1と同様、平面視で円形状をなしたメッシュ状のスペーサー1Cを用意した。比較例1のスペーサー1Cは、ポリプロピレン樹脂を、実施例1と同様の金型を利用して成形した成形品からなる。なお、比較例1におけるスペーサー1Cのメッシュ部の各寸法も、図2に示される通り、実施例1と同じである。
(浸漬試験)
フルオレセインイソチオシアネート(FITC)で標識されたウシ血清アルブミン(BSA)(以下、FITC-BSA)を200ppmの濃度で含むファウラント溶液中に、実施例1及び比較例1の各スペーサー1,1Cを、針金で吊り下げた状態で、浸漬した。
実施例1及び比較例1の各スペーサー1,1Cを、浸漬試験開始時(0時間)、及び所定時間経過後(24時間後、48時間後、72時間後、96時間後、120時間後、144時間後)に、蛍光顕微鏡で観察した。実施例1の蛍光顕微鏡画像は、図3に示し、比較例1の蛍光顕微鏡画像は、図4に示した。
平面視で、実施例1と同様、円形状をなし、かつメッシュ部の構成が図6に示されるような構成のメッシュ状のスペーサー(水処理用流路材)を用意した。実施例2のスペーサーは、ポリプロピレン樹脂100質量部に対して、カーボンナノチューブ(CNT)を5.3質量部(CNT:5質量%)配合した組成物を、所定の金型を利用して成形した成形品からなる。なお、実施例2のスペーサーのメッシュ部は、実施例1とは異なり、互いに平行に並ぶ複数の下側線部m1に対して、平面視で交差するように、互いに平行に並ぶ複数の上側線部m2が重なった形状をなしている。実施例2におけるスペーサーのメッシュ部の各寸法は、図6に示される通りである。
ポリプロピレン樹脂100質量部に対するカーボンナノチューブ(CNT)の配合量を、11.1質量部(CNT:10質量%)に変更したこと以外は、実施例2と同様にして、実施例3のスペーサー(水処理用流路材)を作製した。
ポリプロピレン樹脂100質量部に対するカーボンナノチューブ(CNT)の配合量を、17.6質量部(CNT:15質量%)に変更したこと以外は、実施例2と同様にして、実施例4のスペーサー(水処理用流路材)を作製した。
カーボンナノチューブ(CNT)を配合しないこと以外は、実施例2と同様にして、ポリプロピレン樹脂からなる比較例2のスペーサーを作製した。なお、比較例2におけるスペーサーのメッシュ部の各寸法も、図6に示される通り、実施例2と同じである。
(透水試験)
実施例2~4及び比較例2の各部材の異物除去性を、図7に示されるクロスフローろ過方式の試験装置10を利用して評価した。ここで、先ず、図7を参照しつつ試験装置10について説明する。
実施例5のスペーサーとして、実施例4と同じ構成のものを用意した。つまり、実施例5のスペーサーは、ポリプロピレン樹脂100質量部をベースポリマーとし、かつカーボンナノチューブが17.6質量部の割合(CNT:15質量%)で配合された組成物の成形品からなる。
比較例3のスペーサーとして、比較例2と同じ構成のものを用意した。つまり、比較例3のスペーサーは、カーボンナノチューブが配合されていないポリプロピレン樹脂の成形品からなる。
(透水試験)
ろ過対象溶液18として、FITC-BSAを含む10mmol/LのNaCl水溶液に代えて、塩化カルシウム(CaCl2)を1,000ppm、及び炭酸水素ナトリウム(NaHCO3)を100ppmの濃度で含む10mmol/LのNaCl水溶液に変更したこと以外は、実質的に、上記透水試験と同様にして、試験装置10を利用した無機成分に対する耐ファウリング性評価を行った。ろ過対象溶液18の供給圧力は、上記透水試験と同様、0.7MPaに設定し、ろ過対象溶液18の流量も、同様に500ml/分に設定した。
Claims (1)
- ポリプロピレン樹脂と、カーボンナノチューブとを含むと共に、処理膜とは別体で構成された成形品からなり、かつ前記処理膜上に、前記処理膜と分離可能な状態で配置されるメッシュ状の水処理用流路材であって、
前記カーボンナノチューブの配合割合は、前記ポリプロピレン樹脂100質量部に対して、5.3~18質量部である水処理用流路材。
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