パーラー排水およびパドック流出水の浄化処理を行う多段鉛直流型人工湿地のスタートアップ性能 Start-up Water Purification Performance of Multi-stage Vertical Flow Constructed Wetland Treating Milking Parlor Wastewater and Paddock Run-off

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Abstract

本研究では,酪農排水および不定期に発生するパドック流出水の浄化処理を行う多段鉛直流型人工湿地の冬季を含む8ヶ月間のスタートアップ期における浄化性能に対する多段処理,植栽および水位条件の貢献性について検討を行った.パドック流出水の発生は季節的な雨量に依存しており,流入汚濁負荷は大きく変動していた.それにも関わらず効果的な浄化処理が行われ,BOD,SS,総ケルダール窒素および総リンに対する8ヶ月間の平均除去率は,それぞれ94.6, 87.3, 83.6 および89.9%であった.一方,総窒素の除去性能は安定せず,平均除去率は65.5%であった.これらの水質項目の中で多段処理の貢献性が特に大きく現れたのはSSであった.設定した3つの人工湿地条件の中で最も浄化性能に優れていたのは不飽和かつ無植栽の条件であり,スタートアップ期におけるヨシ根圏が十分に成熟していないことが原因として考えられた.特にスタートアップ年の冬季における浄化性能の安定性に対しては,植栽がマイナスの効果を生み出している可能性が示された.

To investigate the contribution of the treatment stages as well as the effect of vegetation and hydraulic condition on the start-up water purification performance during 8 month operation including winter, a full-scale experimental study was conducted on a 5-stage subsurface vertical flow constructed wetland treating daily milking parlor wastewater and non-periodical paddock run-off. Despite great variation of pollution loading caused by paddock run-off due to seasonal rainfall, efficient removal was attained for BOD, suspended solid (SS), total Kjeldahl nitrogen and total phosphorus with the average removal efficiency of 94.6, 87.3, 83.6 and 89.9%, respectively. Total nitrogen (TN) removal was, however, not stable and the average removal efficiency was 65.5%. The contribution of the number of the treatment stages was significant only for SS removal. Among three conditions, the best performance was obtained with unvegetation under unsaturated condition. The results of this study implied insufficiency of mature of reed rhizosphere during the study period. Even negative effect of the vegetation on the treatment feasibility in winter during start-up operation was suggested.

Journal

  • Japanese Journal of Water Treatment Biology

    Japanese Journal of Water Treatment Biology 47(3), 103-110, 2011-09-15

    Japanese Society of Water Treatment Biology

Codes

  • NII Article ID (NAID)
    10029737529
  • NII NACSIS-CAT ID (NCID)
    AN00351126
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09106758
  • NDL Article ID
    11245146
  • NDL Source Classification
    ZM24(科学技術--科学技術一般--用水・廃水)
  • NDL Call No.
    Z14-557
  • Data Source
    CJP  NDL  J-STAGE 
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