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The development of new recycling-type treatment for nitrate wastewater using lead compounds

Research Project

Project/Area Number 08650988
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionTohoku University

Principal Investigator

YOSHIOKA Toshiaki  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 講師 (30241532)

Co-Investigator(Kenkyū-buntansha) OKUWAKI Akitsugu  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (70005320)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordslead / nitrate / wastewater treatment / nitrogen load / recycling
Research Abstract

[1] Recovery of ammonia and nitrate ion from ammonium nitrate in waste water by steam distilllation adding lead (II) oxide.
Lead (II) oxide was added to 0.1-2M NH_4NO_3 solutions at 373K to precipitate basic lead (II) nitrates and to recover NH_3 simultaneously by steam distilllation for 0.5-2h. Effects of the molar ratio of PbO/NO_3^- and steam distilllation time on the removal of NO_3^- and recovery of NH_3, and the composition of basic lead (II) nitrate were examined. The removal of NO_3^- as pb(NO_3) _2・ 5pb(OH)_2 and recovery of NH_3 reached ca.100% at the PbO/NO_3^- molar ratio of 4 for 1 h. Above 0.5M NH_4NO_3, the removal of NO_3^- was independent on the initial concentration of NO_3^-. The recovery of NH_3 was analogous to the removal of NO_3^-.
[2] Reduction of sodium nitrate solution by in situ buff abrasion of leadplate
Nitrate ions were reduced by fine Pb powder produced by continuous abrasion of Pb plate with buff abrasive in NaNO_3 solution. Under 25-80゚C,initial concentrat … More ion of NO_3^- 0.01-0.1M,and rotation speed of buff 400-800rpm, 20-100% nitrate ion was reduced to NO_3^-, N_2 and/or NH_3 within 12h. Since reduction rate of NO_3^- was extremely slow, maximum percentages of formed N_2 and NH_2 were 14,6, respectively at 12h. Pb was oxidized at 12h to PbO containing unreacted Pb.
In the case of producing bigger Pb particles (20mum) by using coarse buff (#120) and increasing rotation speed, the reduction rate NO_3^- increased due to an increase in amount of abrabed Pb and surface area of Pb by removing PbO layr grown on Pb particles. However, the reduction efficiency of Pb decreased with increasing amount of unreacted Pb core.
[3] Reduction rate of sodium nitrate by lead drops with wet-ballmilling
In a ballmill reactor, metal oxides formed on the lead drops surface by reduction of nitrate ions were continuously removed by contacting with each other.
Under5-80゚C,initial concentration of NaNO_3 0.05-0.1M,and ballmill rotation speed, omega, 80-180rpm, NO_3^- was reduced to NO_2^- fast, then slowly to N_2 and NH_3. NO_3^- was reduced to NO_2^- 32-100% in 10h, but the reduction rate of NO_2^- was very low, so the maximum percentages of N_2 and NH_3 from NO_2^- were only 6 and 10%, respectively.
Above 40゚C,NO_3^- was reduced under zero-order reaction and NO_2^- was formed corresponding to the reduction stoichiometry. The reduction rate was proportional to omega^<1/2>, and the apparent activation energy was 27.5kJ-mol^<-1>, but independent of the NO_3^- concentration. These results may suggest that the rate determining step is the peeling of PbO layr on the particle surface. Below 25゚C,the reduction rate decreased with reaction time as the surface was not covered completely with PbO due to the lowering of the rate. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 菊池 和世: "湿式ボールミル中の鉛粒子による硝酸ナトリウム溶液の還元速度" 化学工学論文集. 23(4). 548-554 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Miho, Uchida: "Recovery Ammonia and Nitrate Ion from Ammonium Nitrate in Wastewater by Steam Distillation Adding Lead(II)Oxide" Hydrometallurgy. 45(3). 239-247 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Miho, Uchida: "XPS Study of Passive Layers Formed on Lead in Aqueous Nitrate Solutions" Chemistry Letters. (5). 449-450 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 内田 美穂: "鉛板のその場バフ研磨によるNaNO_3溶液の還元" 日本化学会誌. (10). 895-902 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kazuyo Kikuchi, Miho Uchida, Toshiaki Yoshioka, and Akitsugu Okuwaki: ""Reduction Rate of Sodium Nitrate by Lead Drops with Wet-Ballmilling"" Kagaku Kogaku Ronbunsyu. 23 (4). 548-554 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Uchida, N.Minakata, and A.Okuwaki: ""Recovery of Ammonia and Nitrate Ion from Ammonium Nitrate in Wastewater by Steam Distilllation Adding Lead (II) Oxide"" Hydrometallurgy. 45 (3). 239-247 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Uchida and A.Okuwaki: ""XPS Study of the passive Layrs Formed on Lead in Aqueous Nitrate Solutions"" Chem.Lett.(5). 449-450 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Miho Uchida and Akitsugu Okuwaki: ""Reduction of NaNO_3 Solution by in situ Buff Abrasion of Lead Plate"" Nippon Kagaku Kaishi. (10). 895-902 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 菊池 和世: "湿式ボールミル中の鉛粒子による硝酸ナトリウム溶液の還元速度" 化学工学論文集. 23(4). 548-554 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Miho Uchida: "Recovery of Ammonia and Nitrate Ion from Ammonium Nitrate in Wastewater by Steam Distillation Adding Lead(II)Oxide" Hydrometallurgy. 45(3). 239-247 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Miho Uchida: "XPS Study of the passive Layers Formed on Lead in Aqueous Nitrate Solutions" Chemistry Letters. (5). 449-450 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 内田美穂: "鉛板のその場バフ研磨によるNaNO_3溶液の還元" 日本化学会誌. 10号. 895-902 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Miho Uchida: "Recovery of Ammonia and Nitrate Ion from Ammonium Nitrate in Wastewater by Steam Distillation Adding Lead (II) Oxide" Hydrometallurgy. (in press). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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