成果報告書詳細
管理番号20110000000915
タイトル*平成22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 うち担体添加型MBRシステムの開発(H21-H23)
公開日2011/7/28
報告書年度2010 - 2010
委託先名株式会社日立プラントテクノロジー 東レ株式会社
プロジェクト番号P09011
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 本研究の目的は、MBRの処理動力の内、主要な動力使用源である散気動力を削減である。具体的には、酸素溶解効率を高めるため活性汚泥を低濃度化することを目指し、(1)活性汚泥が少なくなることによる生物処理速度の低下の改善と、(2)膜面の洗浄性を向上させる手段として、包括固定化担体を添加したMBRシステムを構築する。また、担体接触に耐えうる高耐久性PVDF平膜を新たに開発する。
英文要約This research program is aimed at reducing power consumption of MBR system, especially that of aeration. This newly developed system employs bio-carriers and low concentration of activated sludge to increase oxygen dissolution efficiency for improvement of bio treatment rate, and of revitalizing membrane surface. Besides, new PVDF membrane is also being developed. Three major studies were conducted in this fiscal year, which are verification experiments on feasibility of filtration integrated with bio-carriers in MBR, evaluation tests on membrane durability, and evaluation of removal performance on viruses by this system. In the verification experiments on the filtration method integrated with bio-carriers, reduction of aeration for revitalizing membrane surface was evaluated. The experiment results show that the aeration for revitalizing membrane surface is decreased by nearly 33% or more under the operation condition with addition of bio-carriers, compared to the conventional condition using no bio-carriers. And a bench-scale setup was designed and manufactured in this fiscal year employing the obtained results in this study. And optimized condition on filtration reactor structure was obtained from the analysis employing computational fluid dynamics was either conducted in this study and these results were applied to the design of a pilot plant system. In order to create a membrane which can minimize the damage by bio-carrier and activated sludge, mechanical durability evaluation unit which can damage a membrane quickly was set up in the laboratory. Mechanical durability was evaluated by measuring polystyrene latex rejection difference between before and after the evaluation and also by analyzing average diameter difference of membrane surface between before and after the evaluation. Membrane surface average diameter was analyzed from pictures which were shot by rented scanning electron microscope (SU1510). Various PVDF flat sheet membranes were tested by using of above mentioned mechanical durability evaluation unit. As a result of this test, a membrane made by high molecular weight PVDF polymer and a membrane with high surface porosity made by PVDF polymer at high composition showed good mechanical durability. The former membrane did not show good filtration performance of activated sludge, but the later one showed good filtration performance of activated sludge. And in the evaluation tests evaluation of removal performance on viruses by this system, the treated water by this system has been found to be virtually safe as MBR effluent at the present. This evaluation tests is continuing in the next fiscal year.
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