成果報告書詳細
管理番号20120000000287
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)技術の開発うち,担体添加型MBRシステムの開発(H21-H24)
公開日2013/5/25
報告書年度2011 - 2011
委託先名株式会社日立プラントテクノロジー
プロジェクト番号P09011
部署名環境部
和文要約本研究の目的は,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。平成23年度は,ベンチスケール装置(処理規模3m3/日)を用いた実験を継続し,担体を添加した場合のろ過速度(Flux)、散気量削減、並びに処理性能について評価検討を行った。また、昨年度までの検討結果に基づいて製作したパイロットスケール実験装置(処理規模30m3/日)をウォータープラザ北九州のテストベッドに設置し、実下水と実汚泥を用いた実験を開始した。また,当該装置等をモデルとした流体シミュレーションによる気液二相流現象の解析と担体が添加される場合の挙動解析を継続検討した。また,担体添加による膜表面への損傷の有無を評価する実験,本システムのウイルス除去性能検討を実施した。
(本編抜粋)
英文要約This research program is aimed at reducing power consumption of MBR (Membrane Bio Reactor) 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 with this system. Prior to the verification tests with the bench scale setup, the group had studied the improvement on the aerator for membrane surface cleaning, and obtained the optimized design of the aerator structure which ensures the aeration reduction by 30 %, in which of the condition bio-carriers are not employed. In the verification experiments on the filtration method integrated with bio-carriers, which employs the newly developed aerator, reduction of aeration for membrane surface cleaning was evaluated in the bench scale setup. The experiment results show that the aeration for revitalizing membrane surface is decreased by nearly 50% under the operation condition with addition of bio-carriers, compared to the conventional condition using no bio-carriers. And the pilot scale setup, which had been designed and manufactured in the previous fiscal year, was installed and the filed test with the pilot scale setup was launched from the third quarter. In the of development of the new membrane, SEM analysis of the cross section structure of the membrane showed topmost surface area had low porosity and the next lower area had high porosity. Stable operation flux of the membrane was estimated at 1.0m/d. The new membrane was successfully scale-upped and high flux and durability was proved by filtration test with bio-carriers.
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