集落排水の三次処理システムの開発(1) : 木炭,鹿沼土,ケナフを用いた複合システム Development of a Tertiary Treatment System for Domestic Wastewater(1) : A combination System Composed of Charcoal, Kanuma Soil and Kenaf

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Abstract

集落排水の三次処理システムを開発するために,高知県夜須町の集落排水処理施設で,2本め高度処理実験用水路(A,B)を設置した。各水路(長さ10m,幅56cm,深さ35cm)に,木炭と鹿沼土を敷き,水路Bの鹿沼土の上にはケナフを植えた。通常の方法で処理された二次処理排水を,平均1.2m3/dayの流速,138日間流し,A,B各水路通過前後の窒素,リンを測定し,その除去率を計算した。その結果,実験期間中の窒素,リンの除去率は,水路Aでは39.2%(窒素)と58.3%(リン),水路Bでは51.8%(窒素)と63.1%(リン)であった。これらのことから,特にケナフの成長期には,水路Bが排水処理システムとしては優れているが,冬期には水路Aが利用できると思われる。他方,排水で行った水耕栽培の結果と比較したところ,この処理システムではまだケナフの窒素とリンの除去能力が充分発揮されていないことがわかった。さらにケナフの能力を活用するシステムの検討が必要である。

In order to develop an effective tertiary wastewater treatment system for a local community, a field experiment was performed in Yasu Town, Kochi Prefecture, Japan using two ditches (A and B) set next to a wastewater treatment facility. The removal of nitrogen (N) and phosphorus (P) from the wastewater was quantified. Each ditch (1000 (L) × 56 (W) × 35 (D) cm) composed of charcoal and Kanuma soil beds. Ninety eight kenaf plants (Hibiscus cannabinus L.) were grown only on the Kanuma soil bed of ditch B. The N and P removal percentages by each ditch were calculated. The overall removal percentages of N and P during the 138-day operation period reached to 39.2 % and 58.3 % for ditch A, and 51.8 % and 63.1 % for ditch B, respectively. These results indicate that both system were effective and ditch B was superior as a wastewater treatment system, especially in the growing season of kenaf. The results of solution culture experiments on N and P uptake by single kenaf from the wastewater suggested that the ability of kenaf to remove N and P did not fully utilized in this system, and the other combination might be possible.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 15(1), 49-57, 2002-01-31

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

References:  25

Codes

  • NII Article ID (NAID)
    10008006864
  • NII NACSIS-CAT ID (NCID)
    AN10165252
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09150048
  • NDL Article ID
    6068371
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-1836
  • Data Source
    CJP  NDL  J-STAGE 
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