Application of carbonized fiber membrane prepared by high temperature treatment of cloth fiber to water treatment process

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05665
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Shinshu University
• Principal Investigator: Kiyono Ryotaro 信州大学, 学術研究院工学系, 准教授 (90214915)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 膜蒸留 / 海水淡水化 / 炭化繊維膜

Outline of Final Research Achievements

The degree of hydrophobicity and porosity of the carbonized fiber membrane were measured together with the polyvinylidene fluoride (PVDF) membrane used for conventional membrane distillation. The membrane distillation performance for desalination of these membranes was investigated. Furthermore, the possibility of constructing a desalination process for oil-containing seawater by membrane distillation using a membrane in which a hydrophilic membrane is compounded with this membrane was also investigated.
As a result, the carbonized fiber membrane shows extremely high hydrophobicity as compared with the PVDF membrane. Membrane distillation measurement using 3 wt% NaCl as a feed solution showed that the carbonized fiber membrane had a permeation flux about 5 times higher than that of the PVDF membrane. In the membrane distillation of the composite membrane imparted with hydrophilicity, almost no oil permeation was observed.

Free Research Field

分離工学

Academic Significance and Societal Importance of the Research Achievements

膜蒸留は、工場等で発生する廃熱を熱源として利用できれば、膜上に廃熱で加温した塩水を循環させるだけで塩水から淡水が得られる極めて省エネルギーなプロセスである。今回提案した炭化繊維膜はその高い疎水性と多孔性のため、従来、膜蒸留に利用されている多孔質ポリフッ化ビニリデン膜よりもはるかに高い透過流束を示し、その高い塩除去率から、新たな膜蒸留用の膜としての大きな可能性を示した。大きなエネルギーを供給することなく海水や随伴水から水のみを回収できれば、経済的な効果も非常に大きいと予想される。