成果報告書詳細
管理番号20120000001038
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 高性能大型UF膜モジュールの開発
公開日2012/9/28
報告書年度2011 - 2011
委託先名ダイセン・メンブレン・システムズ株式会社
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)高性能UF膜の開発・ 最適膜素材の探索
造水量100m3/日規模の海水淡水化施設を実現するためには、海水を淡水化する逆浸透(RO)膜の膜エレメント・モジュールを高効率かつ大型化すると同時に、RO膜の前処理として用いる限外ろ過(UF)膜においても同様の革新的研究が必要である。本研究開発では、高性能UF膜の開発として、膜ろ過性能の著しい低下をもたらす膜ファウリングを低減させることを目的として膜素材の最適化を試みた。
英文要約1) Development of High Effective UF Membrane : In order to achieve the mega-ton scale desalination more effectively by the highly efficient reverse osmosis (RO) membrane module, the pretreatment of the RO by using the highly efficient ultrafiltration (UF) membrane is significantly important. We investigated the various UF membranes of both cellulosic and non-cellulosic materials which have less fouling of the membranes last year. With the non-cellulosic materials we synsesized several polymers, varied both hydrophilicity and electrical charge of the membrane materials and fabricated the hollow fiber membranes under various spining conditions such as the concentration of the polymers in the spining dopes, the fabrication temperatures and the internal coagulant compositions . The surface ζ-potential and the hydrophilicity of thenon-cellulosic membrane can be controled by the ionic modification of the polymers. The UF fluxes with various membrane materials were compared for the filtration with the bench scale testing bed using river water as feed water. The crossflow filtration was conducted with the hollow fiber membrane modules in the lumen side pressure driven method. As the results, we obtained the extremely less fouling non-cellulosic membrane material and the hollow fiber membrane of optimized pore structure. The flux for the novel non-cellulosic hollow fiber membrane was almost 1.5 times as high as the conventional ultrafiltration membranes with non-cellulosic material. The novel non-cellulosic membrane still needs to be improved for the higher flux (twice as high as the conventional ultrafiltration membrane) and the commercial use. We will continuously investigate the less fouling materials as well as the practical fabrication method of the hollow fiber membrane and evaluate the membrane as the pretreatment of the SWRO desalination in the next year project. 2) Development of Large UF Membrane Module : In order to reduce the cost of the treated water in mega-ton SWRO system, it is necessary to utilize the large UF membrane module for pretreatment as well as the large RO module for desalination. As we designed the large UF membrane module by the calculation of the structural strength and the analysis of the flow pattern in the module in the last year project, in this year project we made the actual large membrane module with the diameter of 12 inches and the length of 1.8m. It was confirmed that the large module had high water permeability and enough strength and durability due to the accelerated pressure shock test The module had very low pressure loss for the filtration by improving the internal structure of the module so as to increase the flow rate about 50% higher than that of the conventional module structure. On the basis of the results of this year project, we evaluate the water treatment cost of the pretreatment of SWRO by using the large UF membrane module is about 30% lower than the conventional UF pretreatment of SWRO.
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