Investigation on the Possibility of Sewage Sludge Treatment by Earth Worms (I)

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  • MORI Tadahiro
    Research & Technology Development Division, Japan Sewage Works Agency
  • OKADA Mitsumasa
    Water & Soil Environment Division, National Institute for Environmental Studies

Bibliographic Information

Other Title
  • シマミミズによる汚泥処理の可能性に関する研究　Ｉ　　下水汚泥たい肥を用いたシマミミズの飼育とその個体生産諸過程の検討
  • 下水汚泥堆肥を用いたシマミミズの飼育とその個体生産諸過程の検討

Description

Microorganisms such as bacteria and/or actinomyces have been used for sludge treatment, e. g., aerobic or anaerobic digestion and composting. It is well known that some soil animals also play an important role in the decomposition of organic materials. <BR>Resently, earth worms (Eisenia foetida) have been successfully applied to treat sledges produced in the pulp or food processing plants. It should, therefore, be possible to apply E. foetida for sewage sludge treatment.<BR>In this research, sewage sludge compost was fed to E. foetida and the following results were obtained ; <BR>(1) The growth, cocoon production, respiration and egesta rates were measured in the laboratory cultures and each rates was expressed as a function of fresh weight. <BR>(2) Using these equations, the carbon balance in the growth and reproduction processes of E. foetida at 20 was investigated. <BR>Considering the amount of carbon utilized for each process, it was suggested that E. foetida did not contribute directly to the decrease of organic materials but it might reduce them in collaboration with bacteria. <BR>It could be assumed that the properties of organic materials were changed after consumption in such a way that is beneficial to the growth of plants.

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