汚泥を原料とする低温メタン発酵消化液を施用した水田土壌におけるメタン発生および窒素無機化特性  [in Japanese] Methane Production and Nitrogen Mineralization in Paddy Soil Treated with Low-temperature Anaerobically Digested Sludge  [in Japanese]

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Author(s)

    • 中村 真人 NAKAMURA Masato
    • 国立研究開発法人農業・食品産業技術総合研究機構農村工学研究部門 Institute for Rural Engineering, National Agriculture and Food Research Organization
    • 日高 平 HIDAKA Taira
    • 京都大学大学院工学研究科都市環境工学専攻 Department of Environmental Engineering, Kyoto University
    • 山岡 賢 YAMAOKA Masaru
    • 国立研究開発法人農業・食品産業技術総合研究機構農村工学研究部門 Institute for Rural Engineering, National Agriculture and Food Research Organization
    • 折立 文子 ORITATE Fumiko
    • 国立研究開発法人農業・食品産業技術総合研究機構本部 Headquarter, National Agriculture and Food Research Organization

Abstract

<p>発酵温度が通常(35℃)より低い低温メタン発酵と消化液の液肥利用は,エネルギー効率を改善できる有望な技術であるが,低温条件が消化液の組成や肥料特性に及ぼす影響は未解明である.そこで本研究では,室内培養試験により,脱水汚泥を原料とする低温メタン発酵消化液の水田土壌施用後のメタン発生・窒素無機化特性を調査した.その結果,発酵温度が15℃の条件ではメタン発酵過程で未分解の成分が他の条件より多いため,相対的に土壌でのメタン発生量が多くなることが示された.一方,発酵温度が25℃以上であれば,分解が十分に進み,土壌でのメタン発生量は相対的に少なかった.また,消化液中の有機態窒素の無機化に伴うアンモニア態窒素の増加割合は,発酵温度に関わらず少なかった(3~13%)ことから,消化液のアンモニア態窒素分を考慮して施肥設計すればよいことが示された.</p>

<p>Methane fermentation under lower temperature conditions than normal (35 °C) and the use of digested sludge as a fertilizer are promising as an energy efficiency improvement technology. However, there is little information available on the influence of digestion under low temperature condition on the compositions and characteristics of sludge as a fertilizer. In this study, we conducted incubation testing to examine the characteristics of methane production and nitrogen mineralization in paddy soil treated with the low-temperature anaerobically digested sludge.</p><p>Relatively more methane was produced in soil treated with sludge digested at 15 °C, because organic matter that is not decomposed under anaerobic digestion is used as a substrate for methane production in soil. On the other hand, little methane production was observed in soil treated with sludge digested at more than 25 °C. Moreover, only a small amount of ammonium nitrogen (3 to 13%) was released from anaerobically digested sludge after application under all low temperature conditions. Therefore, an appropriate rate of application of anaerobically digested sludge can be determined based on the ammonium nitrogen in the sludge.</p>

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 86(2), I_139-I_146, 2018

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130007421454
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    029475635
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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