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Softening treatment of leachate from sanitary-landfill by crystallization process

Research Project

Project/Area Number 02650383
Research Category

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

Allocation TypeSingle-year Grants
Research Field 都市工学・衛生工学
Research InstitutionKumamoto University

Principal Investigator

NAKAJIMA Shigeki  Department of Civil and Environmental Eng. Professor, 工学部, 教授 (10109671)

Co-Investigator(Kenkyū-buntansha) ICHINOSE Teruko  Department of Civil and Environ. Eng. Associate researcher, 工学部, 助手 (30213002)
HARADA Hiroyuki  Graduate School of Science & Technology Associate researcher, 自然科学研究科, 助手 (20222234)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1991: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1990: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsCrystallization / Softening / Fluidized-bed / Blast furnace slag / 軟化処理 / 浸出水 / 種晶
Research Abstract

(1) Sanitary landfill leachate softening processes have recently gained importance for scaling problem. Calcium carbonate crystallization characteristics were studied by using the apparatus of fluidized-bed type reactor, with the existence of seeds (blast furnace slag). The caustic soda and sodium hydrogen carbonates were used for softening. The concentration of calcium in synthetic leachate was adjusted from 1.2 to 14.1 mol・m^<-3>. The crystallization proceeded rapidly. At the first sampling point, the concentration of calcium was already reduced from its influent value to effluent value. The calcium removal rate reached was 48%-60%. The turbidity of effluent was under 30, and its pH value was 7.3-8.0. The contents of the fluidized-bed are thoroughly mixed. This reaction can be described by the following equation :
Co-C=Ko・C・rheta
where Co : influent of Ca^<2+>[mol・m^<-3>] C : effluent of Ca^<2+>[mol・m^<-3>] rheta : retention time [h] Ko : reaction rate constant[h^<-1>]
(2) Treatment of landfill leachate using a process for softening such leachate by crystallization was studied. Concentrations of human, organic substance and ammonia in the leachate were lowered after this treatment. Centered pellets and molten slags, prepared from sewage sludge, were utilized as seed to recycle such sludge effectively. Experimental treatments were carried out to determine the crystallization rate, and effects of operating conditions on the reaction rate was discussed. The reaction processes following to second order kinetics. The effect of reaction temperature was negligible.
The resulting, the total hardness reaction rate was proportional to 0.6th power of pH value.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 原田 浩幸,古田 秀雄,平沢 泉,中島 重旗: "ペレット法による高濃度カルシウムの軟化処理に関する基礎的研究" 廃棄物学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 原田 浩幸,古田 秀雄,田中 一彦,中島 重旗: "廃棄物最終処分場浸出水の晶析処理の実験的研究(2)" 工業用水.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 原田 浩幸,平沢 泉,中島 重旗: "埋立浸出水の硬度およびCOD成分の晶析処理における結晶成長速度" 化学工学テクニカルレポ-ト. No.20. 38-45 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroyuki Harada, Hideo Furuta, Izumi Hirasawa, Shigeki Nakajima: "Fundamental Study of High Level Concentration of Calcium by Crystallization in a Fluidized-bed reactor" Haikibutu gakkaishi.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroyuki Harada, Hideo Furuta, Kazuhiko Tanaka, Shigeki Nakajima: "Sotening treatment of leachate from landfill by crystallization process (2)" Kougyou yosui.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hiroyuki Harada, Izumi Hirasawa, Shigeki Nakajima: "The growth rate of seed size with softening process of sanitary landfill leachate" Kagaku kougaku technical report. No. 20. 38-45 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 原田 浩幸,古田 秀雄,平沢 泉,中島 重旗: "ペレット法による高濃度カルシウムの軟化処理に関する基礎的研究" 廃棄物学会誌.

    • Related Report
      1991 Annual Research Report
  • [Publications] 原田 浩幸,古田 秀雄,田中 一彦,中島 重旗: "廃棄物最終処分場浸出水の晶析処理の実験的研究(2)" 工業用水.

    • Related Report
      1991 Annual Research Report
  • [Publications] 原田 浩幸,平沢 泉,中島 重旗: "埋立浸出水の硬度およびCOD成分の晶折処理における結晶成長速度" 化学工学テクニカルレポ-ト. No.20. 38-45 (1990)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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