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1992 Fiscal Year Final Research Report Summary

A STUDY ON THE METHOD OF REMOVAL OF NITROGEN AND PHOSPHORUS FROM AGRICULTURAL DRAINAGE WATER

Research Project

Project/Area Number 02660233
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionNIIGATA UNIVERSITY

Principal Investigator

MISAWA Shinichi  NIIGATA UNIV., FACULTY OF AGRIC., ASSOCIATE PROF., 農学部, 助教授 (30018791)

Co-Investigator(Kenkyū-buntansha) OOKUBO Hiroshi  YAMAGATA UNIV., FACULTY OF AGRIC., ASSOCIATE PROF., 農学部, 助教授 (80203735)
Project Period (FY) 1990 – 1992
KeywordsWater quality / Removal rate / Total nitrogen / Total phosphorus / sedimentation
Research Abstract

It was found that almost all nitrogen in the drainage water from agricultural land are soluble forms except during the paddling and transplanting season, and phosphorus is always in the insoluble form. Phosphorus combines with iron(Fe) except during the paddling and transplanting season, in that season phosphorus combines with soil particles.
In paddy fields on alluvial planes like the Niigata planes, by deoxidization, iron in the paddy soils becomes soluble, so phosphorus combined with the iron also becomes soluble. Through under-drains, water containing soluble phosphorus flows out into drainage channels.
In the channels, by oxidization phosphorus changes to the insoluble form again and sinks to the channel bed when drainage discharge is small, during floods the sediments rises up and flow down the channels.
If characteristics of sedimentation of phosphorus compounds could be utilized, it would become possible to remove phosphorus from the agricultural drainage water. It was found that the sediments on the channel beds, contains 10 times of phosphorus in paddy soil. Phosphorus volumes contained in sediments from the drainage channel located in front of the Shirone drainage pump station, reached nearly 10% of total effluent phosphorus.
So there is a possibility of removing a lot of phosphorus from agricultural drainage water by artificial settling basins. It is almost impossible to remove nitrogen by sedimentation.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 近藤 正: "北陸地方の沖積低平地水田におけるN,P負荷量の流出特性-新潟平野での測定結果との特徴-" 農業土木学会論文集. 159. 17-27 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 近藤 正: "代掻田植時期のN,P成分の流出特性について" 農業土木学会論文集. 164. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中川 誠: "農地排水河川の自然浄化機構について" 平成4年度農業土木学会講演要旨集. 452-453 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tadashi Kondoh: "Characteristics of effluent loads of nutrient salts(N,P) from paddy fields located in the alluvial and lower area in Hokuriku district." Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering,. No.159. 17-27 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tadashi Kondoh: "Characteristics of effluent loads of nitrogen and phosphorus from paddy fields during the paddling and transplanting season." Transactions of the Japanese Society of Irrigation,Drainage and Reclamation Engineering.No.164.(1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Makoto Nakagawa: "Characteristics of natural purification of water quality in agricultural drainage channel." Abstracts of the meeting in 1992 of the Japanese Society of Irrigation, Drainage and Reclamation Engineering.452-453 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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