成果報告書詳細
管理番号20120000001235
タイトル*平成21年度~平成22年度のうち平成21年度分中間年報 開発項目 「新エネルギー技術研究開発/新エネルギーベンチャー技術革新事業(バイオマス)/微生物燃料電池を利用した有機性排水処理システムの技術開発」
公開日2012/12/19
報告書年度2009-2009
委託先名株式会社日立プラントテクノロジー, 国立大学法人広島大学
プロジェクト番号P10020
部署名技術開発推進部
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
本事業では,微生物のエネルギーを利用した微生物燃料電池(以下,MFC)を汚泥処理に利用することに着目した。排水の生物処理に伴い発生する汚泥量は莫大であり,最終処分場が逼迫するなど,その処分が問題となっている。
英文要約Title : New Energy Technology Research Development / New Energy Venture Business Technology Innovation Program (Biomass) / Development of Organic Waste Treatment Technology Utilizing Microbial Fuel Cell,Hitachi Plant Technologies, Ltd. & Hiroshima University : Annual Report 2009
A huge amount of excess sludge generated as a byproduct of the wastewater biological treatment causes a problem of disposal such as an insufficient final landfill sites, etc. To build a new system producing no excess sludge, we are developing Microbial Fuel Cells (MFCs), that deprive microorganisms of their energy in the organic waste treatment based on the Activated Sludge process. Moreover, by studying the practical use of the technology, we are creating a business plan for its early commercialization.
In this year, we have made a trial model of MFC, and evaluated the MFC performance and the sludge suppression effect.
(1)Research and development to improve the MFC performance
We made a trial model of MFC. It has been made as an air cathode type MFC, using Membrane Electrode Assembly composed of a membrane, an anode made of carbon and a cathode made of carbon powders with Pt catalyst. With installing the MFC on a continuous wastewater treatment reactor for synthetic wastewater (TOC 1000mg/L), the sludge suppression effect was found approximately 35% of that in the MFC-uninstalled system. However, the sludge suppression effect was seen only for about 20 days, after then the amount of sludge production in the MFC system became to almost the same level as the control system.
Since a shortage of mediator was assumed as the reason, the exoelectrogen culture which can transfer electrons out of the cells was added to the MFC system continuously. The amount of sludge production tended to slightly decrease after about 10 days since the culture addition, and the rate of sludge suppression was decreased to approximately 60%, therefore it has turned out that keeping the mediator is critical.
Since the maximum power density per anode area in the period was 338µW/m2, further improvement in the cell performance is found necessary to achieve the higher power density.
(2)Evaluation of sludge suppression effect by means of laboratory experiments
With a dual tank-type MFC where anode and cathode are separated by a membrane, the sludge suppression effect was evaluated by means of batch tests. Using a braid-shaped carbon as anode and a carbon felt as cathode, potassium ferricyanide was added to electrolyte solution in the cathode tank. In this condition, the sludge production was able to be suppressed to 25% compared to an ordinary aerobic treatment, accordingly we have gained a prospect to meet the objective; the rate of sludge suppression is 70% or more.
(3)Business plan
We have studied the business plan to commercialize the sludge suppressing-type unit composed of MFCs. If our final goal (the rate of sludge suppression is 90%) is achieved, customers will benefit from purchasing this system for the same price as merely 3 years’ sludge disposal cost, promising that the technology possibly leads to successful business. This system shall be applied for Combined Household Wastewater Treatment Facilities with a high maintenance cost for excess sludge treatment.
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