成果報告書詳細
管理番号20120000000228
タイトル平成23年度中間年報  省水型・環境調和型水循環プロジェクト 水循環要素技術研究開発 省エネ型膜分離活性汚泥法(MBR)技術の開発(H21-H25)
公開日2012/6/9
報告書年度2011 - 2011
委託先名株式会社クボタ
プロジェクト番号P09011
部署名環境部
和文要約1. 研究開発の内容及び成果等
本研究では省エネ型膜分離活性汚泥法(MBR)技術の開発に向けて、3つの研究開発課題(a)膜素材・膜孔径の最適化、(b)膜洗浄手法の効率化、(c)水処理システム全体の効率化に取り組むことにより、平成23年度までの中間目標として曝気エネルギーを従来比50%削減すること及び平成25年度までの最終目標としてMBRシステム全体の消費エネルギーを従来比40%削減することを目指している。なお、平成23年度までの中間目標を達成するための具体的数値目標は、(1)下水向け設計膜ろ過流束(フラックス)を1.0m/dに向上させること及び(2)膜洗浄空気量を従来比50%削減することである。
英文要約In this project, Kubota addresses three approaches, 1) Optimal membrane material and pore size, 2) Efficient membrane cleaning method and 3) Efficient wastewater treatment system for energy-saving MBR. The midterm and final targets of this project are to reduce the energy consumption of air blower by 50% by FY 2011 and to reduce that of MBR total system by 40% by FY2013 compared to our current MBR system, respectively. The specific targets to achieve above midterm target are both enhancing the design flux for municipal wastewater up to 41.7LMH and reducing the air supply rate from membrane diffuser by 50%. Pilot test plant was operated in Fukusaki STP with four lines of each capacity of 100 to 150 m3/d in order to verify the outcomes of this project. In the pilot plant, it was verified that the current membrane unit with newly developed PTFE membrane could achieve the target design flux of 41.7 LMH stably even in the low temperature condition. It was also found that the new compact membrane unit with current CPVC membrane could reduce the air supply rate by 43 %, combining with controlling air supply rate by monitoring TMP change continuously. It was also confirmed that operation with lower F/M ratio was effective to reduce fouling substances such as polysaccharides and proteins in activated sludge in winter.
The pilot test plant was modified and upgraded to the demonstration test plant with two lines of 400 m3/d and 150 m3/d, respectively in order to verify the final target of this project in the end of FY2011.
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