成果報告書詳細
管理番号20090000000231
タイトル*平成20年度中間年報 新エネルギー技術フィールドテスト事業 地域バイオマス熱利用フィールドテスト事業 高タンパク質含有漁業系廃棄物等を対象とした無加水メタン発酵システムの実証試験事業
公開日2009/8/18
報告書年度2008 - 2008
委託先名大成建設株式会社
プロジェクト番号P07018
部署名新エネルギー技術開発部 バイオマスグループ
和文要約以下本編抜粋:1.共同研究の内容及び成果等 漁業系廃棄物は、年間400万トン発生していると推定されているが、海洋投棄が規制され新たな処理技術が要求されている。一方、食品由来の廃棄物は年間2,200万トン発生していると推定されているが、他のバイオマス資源と比較して大幅にリサイクルが遅れている。そこで、本事業は、漁業系廃棄物と生ごみを対象として、これらウェットバイオマスを加水することなく固形のままメタン発酵するためのシステムを構築した実証試験を行い、無加水メタン発酵技術の具現化を目指すものである。
英文要約Title : Pilot-scale test of non-dilution methane fermentation system for the fishery and food wastes which include high content of protein (FY 2007 - FY 2009) FY 2008 Annual Report We are developing the non-dilution methane fermentation system treated for fishery and food wastes. In the case of methane fermentation without water, the ammonium ion is produced from degradation ofproteins and accumulates in the fermentation tank. And then methane production is inhibited by high concentration of ammonium. We have developed a system to evade ammonium accumulation and fosterhighly effective methane production. The system consists of ammonium production process by using specific microorganisms, ammonium removal (ammonia stripping) process by chemical reaction, and methane fermentation process with low nitrogen loading rate. In this project, we aimed to systematize the development process and to verify it on the pilot scale, and started a three-year field test (FT). As a basic specification for the FT plant, processing amount is 500kg/day and biogas production amount is 100Nm3/day. The plant is built in the Kamaishi incineration facilities. The main equipment of the plant system is composed of a ripper, the aforementioned 3 tanks, a desulphurization tower, a gasholder, and a co-generation system.In the second year of this project, the outline of execution is described as follows. 1) Research on process performance of non-dilution methane fermentation system Plant construction was completed at the end of April and we started to supply food waste to the plant for this study from 15 May. The food waste which contains fish and meat wastes was collected from 10 sites in Kamaishi city, which include a supermarket and so on. Supply amount of the food waste was gradually increased according to methane production activity in the start-up period. We have achieved a steady operation of the plant, i.e. the plant produced approximately 100m3/ day of biogas by supplying amount of 500kg/ day food waste after 3 months. We have conducted improvement construction everywhere in the plant and we subsequently studied the efficiency of each process in the plant under various operation conditions. Ammonium was produced approx. 80% from the proteins such as fish and meat waste in the ammonium production process. Over 95% of the total nitrogen was also removed during the ammonium removal process. Therefore, methane fermentation was stable without ammonium inhibition by introducing the pre-treatment processes. However lipids containing un-degradation proteins were unexpectedly supplied to methane fermentation process from mmonium removal process at 145 to 155 days. Methane production activity was quickly creased due to accumulation of acetate and propionate in addition to ammonium in methane fermentation tank after that. The lipid compound was not well mixed with bacteria in ammonium production cess. Therefore, we have conducted remodeling construction for the pre-treatment system. On the other hand, a high concentration of propionate was detected at after 250 days, whereas onium was not accumulated in methane fermentation tank. We are now analyzing the cause of this on. Accumulated propionate was decreased after 300 days, and then methane production activity was recovered.
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