成果報告書詳細
管理番号20120000001036
タイトル*平成23年度中間年報 最先端PG(Mega-ton Water System) 高効率・大型分離膜エレメント・モジュール 高効率・大型RO膜スパイラルエレメント 
公開日2012/10/31
報告書年度2011 - 2011
委託先名東レ株式会社 株式会社東レリサーチセンター 国立大学法人神戸大学
プロジェクト番号P09025
部署名環境部
和文要約和文要約等以下本編抜粋:
1.研究開発の内容及び成果等
(1) RO膜合成研究開発(東レ株式会社)
(1)1 海水淡水化RO膜に求められる技術ポイントは、エネルギー消費量削減と水質向上である。エネルギー消費量に密接に関連する運転圧力に着目し、標準圧力(5.5 MPa)と低圧化(4.5 MPa, 4.0 MPa)によるエネルギー消費量の関係を解析したところ4.5 MPaで約20%、4.0MPaで約30%のエネルギー低減が可能であることがわかった。
英文要約1) Polyamide membranes: RO membrane technologies have made great progress and in seawater and brackish water desalination field, both energy saving and water quality improvement have been two major subjects. In order to obtain further excellent performance, we has been executing fundamental research for RO membranes on investigating physical and chemical properties which has resulted in the advanced RO membranes with high flux, high rejection. :2) Fine Structure of RO membrane: To prepare the installation of Positron Annihilation Lifetime Spectroscopy (PALS), which can be used for the determination of the pore size distributions in reverse osmosis membranes, a design of the equipment and a deliberation of a radiation controlled area were carried out. An auto-measurement system for Positron annihilation lifetime spectroscopy (PALS), which can be used for the determination of the pore size distributions in reverse osmosis membranes, was installed for efficient operations. A special sample preparation technique, an optimum observational condition and quantitative analysis method from 3-dimensinal data were checked up and developed for the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) observation, which can be used for the micro-structure-morphology analysis of reverse osmosis membranes. :3) We carried out trend survey of membrane element upsizing. And it became evident that water cost and plant construction cost are advantageous so that element diameter became big. On the other hand, it also became clear that there was a problem to a design and the production cost of large-sized vessels more than 20 inches. : 4) To design an reverse osmosis (RO) membrane element optimally, it is important to suppress the permeability decrease due to the concentration polarization and to reduce the pressure drop in the channel. In addition, the large-diameter RO element has been researched to lower the cost associated with large-scale desalination process. Many researchers have investigated the flow and the mass transfer in the spacer-filled channel in RO element using computational fluid dynamics (CFD) technique. However, these reports just focused on the minimal unit areas in the feed channel. Thus, the flow and the mass transfer in the whole area of RO element are still not known yet. The aim of this study is to develop the technology to compute the flow and the mass transfer in the whole area of RO element numerically.
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