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Material balance and microbial community of activated sludge process with excess sludge minimization stream

Research Project

Project/Area Number 12450211
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil and environmental engineering
Research InstitutionThe University of Tokyo

Principal Investigator

MINO Takashi  The University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 教授 (60166098)

Co-Investigator(Kenkyū-buntansha) KURISU Futoshi  The University of Tokyo, Graduate School of Engineering, Research Associate, 大学院・工学系研究科, 助手 (30312979)
SATOH Hiroyasu  The University of Tokyo, Graduate School of Frontier Sciences, Associate Professor, 大学院・新領域創成科学, 助教授 (90251347)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2001: ¥3,100,000 (Direct Cost: ¥3,100,000)
Keywordsactivated sludge process / excess sludge / ozone treatment / zero emission / inorganic compounds / sludge solubilization / metal salts / ICP analysis / 微生物群集解析 / DGGE
Research Abstract

In order to reduce the environmental impact from wastewater treatment processes and to achieve "zero emission" technology, it is very important to have wastewater treatment systems that can maximize mineralization of organic mattes in the wastewater and to minimize the excess sludge production. For such a purpose, the activated sludge process with a sludge digestion stream has been developed, in which a part of the return sludge is digested and solubilized before returning to the aeration tank. This is a promising process, but it is necessary for the purpose of practical use of the system to solve the problem of the accumulation of inorganic components in the system and to confirm the long-term stability of the system. In the present study, an activated sludge process with a return sludge digestion by ozonation was operated in the laboratory with a municipal wastewater and the material, balance of different inorganic compounds was investigated. The specific objective of the study was to monitor the behavior of inorganic matters entering the system by using ICP analysis and to clarify the mechanism of their behaviors. The experimental results indicated that: 1) Some metals like Na did not accumulate in the system and go out in the effluent in the soluble form. 2) Some metals like Fe and Al accumulated in the sludge, but after some time the accumulation appeared to come to a saturation, and 3) Some metals like Zn and Cu continued to accumulate in the sludge throughout the experimental period. Among these metals, Fe showed an interesting behavior: after the accumulation of Fe came to saturation, the effluent soluble Fe concentration increased, indicating there is a mechanism of Fe re-solubilizatlon. It is needed to further investigate the chemical mechanism of this re solubilization of Fe.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 廣岡佳弥子, 佐藤弘泰, 味埜俊: "汚泥削減型活性汚泥プロセスにおける無機物質の挙動"環境工学研究フォーラム講演集. 38号. 67-69 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kayako HIROOKA, Hiroyasu SATOH, Takashi MINO: "Behavior of inorganic matters in activated sludge process with excess sludge digestion stream"Proc. Environmental Forum. vo.38. 67-69 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 廣岡佳弥子, 佐藤弘泰, 味埜俊: "汚泥削減型活性汚泥プロセスにおける無機物質の挙動"環境工学研究フォーラム講演集. 38号. 67-69 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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