成果報告書詳細
管理番号20120000001043
タイトル*平成23年度中間年報 最先端PG(Mega-ton Water System) 浸透圧発電 正浸透膜の基礎特性評価 
公開日2012/9/28
報告書年度2011 - 2011
委託先名国立大学法人山口大学
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)膜の基礎評価法の確立
本年度は昨年度開発した3.0MPaまでの測定が可能な正浸透平膜評価装置(図1)、駆動溶液の再生をROモジュールで行うことで長期連続運転条件下での評価が可能なFO・PRO膜評価装置(図2)を用いて、市販正浸透(FO)膜および中空糸膜モジュール(モジュールA、B)の性能評価を行った。
英文要約1) Evaluation systems for forward osmosis (FO) membranes and FO membrane modules. In this research project, we have built up the evaluation system for flat-sheet FO membranes and FO membrane modules under FO mode (at zero applied pressure) and PRO mode (0 < applied pressure < osmotic pressure in the system). 2) .Characterization of PRO performance for flat-sheet FO membranes and FO membrane modules. In the experiment for flat-sheet membranes, two FO flat-sheet membranes (FO-1 and FO-2) purchased from Hydration Technologies Inc. were used as a sample membrane. The water flux of FO-2 membrane shows 18 L/m2h at zero applied pressure, and decreases with increasing applied pressure in the system. The power density of FO-2 membrane, which is defined as the product of the water flux and applied pressure, increases with increasing applied pressure, and shows a maximum value of 4.3 W/m2 at 1.2 MPa of the applied pressure. FO-2 membrane has better performance in the water flux and power density than FO-1 membrane, because the former has lower B value and S value than the latter. The water flux through the membranes increases with increasing DS concentration due to the increase in effective osmotic pressure difference across the membranes. The power density with 1.2 M DS, whose data were not shown here, shows 13 W/m2 at 3.0 MPa of the applied pressure.  In the experiment for large-scale membrane modules, two type hollow fiber membrane modules (Modules A and B) were used as test modules. The water flux of the modules decreases with increasing applied pressure difference because the driving force of the water flux decreases with increasing applied pressure difference. The water flux of Module B is about two times higher than that of Module A at the same applied pressure difference because Module B has higher water permeability than Module A. Theoretically, the water flux at zero applied pressure will be equal to the osmotic pressure difference between DS and FS: 2.98 MPa. However, the water flux of Modules A and B becomes zero when the applied pressure was 2.3 MPa and 2.6 MPa, respectively. The deviation between the experiments and the theoretical value will be due mainly to internal concentration polarization in the support layer of the forward osmosis membrane. The maximum values are 1.7 W/m2 for Module A at 1.0 MPa of the applied pressure, and 4.2 W/m2 for Module B at 1.4 MPa of the applied pressure. The power density of Module B is about 2.5 times higher than that of Module A. The applied pressure at the maximum power density of the two modules is almost half value of the pressure at the zero water flux mentioned above.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る