成果報告書詳細
管理番号20140000000212
タイトル*平成25年度中間年報 馬鈴薯澱粉製造時に発生する廃水・廃棄物をモデル原料とする水熱可溶化技術を組み合わせたコンパクトメタン発酵システムの研究開発
公開日2014/6/11
報告書年度2013 - 2013
委託先名株式会社竹中土木 株式会社竹中工務店
プロジェクト番号P10010
部署名新エネルギー部
和文要約
英文要約Title: Research and development of a compact methane fermentation system combining hydrothermal solubilization technologies and utilizing wastewater and solid waste generated during potato starch manufacturing as model materials (FY2013-FY2014) FY2013 annual report

We developed a compact system capable of efficient methane fermentation of hydrocyclone wastewater and starch residue, which are generated in large volumes from potato starch production, by combining organic matter condensation by membrane separation and molecular size reduction by hydrothermal solubilization. The system process consists of the separation and condensation of hydrocyclone wastewater by use of submerged membrane, mixing with starch residue, molecular size reduction by hydrothermal treatment, further condensation of the obtained liquid by using a multi-stage membrane system, and methane fermentation. The development of submerged membrane and multi-stage membrane systems was done by Takenaka Civil Engineering and Construction Co., Ltd.; the development of hydrothermal solubilization and compact methane fermentation systems and system integration and evaluation by Takenaka Corporation; and the field test at the Bihoro District Agricultural Product Processing Cooperative Federation factory by the two companies. (1) Submerged membrane separation system: On the basis of test results obtained last year, a line was newly installed to drain the filtered water from the submerged membrane in each submerged membrane unit for controlling the pressure difference more accurately and operating in a more stable manner. Two units were additionally installed to moderate the increase in pressure difference due to drainage. As a result, a total of eight units were in place. (2) Hydrothermal solubilization system: There was a difference in slurry supply to two systems of reaction containers. Then, the supply piping was renovated. Manual pressure regulating valves were manufactured for each system to stabilize discharge. (3) Multi-stage separation system: The liquid separated from the solid by hydrothermal solubilization was fed to the system to analyze the separated liquid and verify separation performance. (4) Compact methane fermentation system: Keeping the water temperature required for fermentation was difficult in November last year because air temperature was low. Then, thermal insulation systems were installed in the main body of methane fermentation tank and in material supply piping. As a result, temperature was stably kept at 30 degrees or higher in the reaction tank even at an outdoor temperature of minus 5 degrees. Stable gas generation was verified. (5) System integration and evaluation: Control design will be developed and an integrated control panel will be manufacture by early August 2014 before the commencement of operation at plant. Performance will be verified during the verification test at the time of operation at plant in September through November. (6) Field test and follow-up: System operation was verified 24 hours a day on October 15 through November 15, 2013 during the verification tests in the period between September and mid November the same year. Problems were identified in each system and a total of seven operators were familiarized with the system.
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