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Student Number 82326014
Author Luoh Ming-Yung(d)
Author's Email Address No Public.
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Department Graduate Institute of Environmental Engineering
Year 1994
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Study on Development of Automatic Control Sequencing Batch Reactor for Treating Heavy Metal Wastewater by Chemical Precipitation
Date of Defense
Page Count 110
Keyword
  • chemical precipitation
  • heavy metal wastewater
  • return sludge
  • SBR
  • Abstract The purpose of this study was to develope an automatic control
    sequencing batch reactor (SBR) for chemical precipitation of
    heavy metals fromelectroplating wastewater. A capacity of 2
    cubic meters pilot-scale SBR facility was installed at a
    plating factory whose wastewater mainly contain Cr,Zn and Fe
    with the concentration in about 150 mg/l, 450 mg/l and 120 mg/
    l, respectively. For a long term on-site test run, the
    treatment efficiency for heavy metal removal was investigated
    and the operatingstrategies of SBR were evaluated. The results
    indicated that the effluent concentration of heavy metals,
    including Cu, Zn, Cr and Fe, could be treated to as low as to
    meet the National Effluent Standard of 1998 no matter what
    operating strategies were employedin this study. There are
    several discrete operational periods were established during
    one cycle for each sequencing batch treatment of the plating
    wastewater.The periods were fill/pH adjustment/rapid mix, slow
    mix (flocculation), settle, draw, and idle/waste sludge in a
    time sequence. Idle and/or waste sludge could be eliminated
    depending on requirements of the treatment problem. When sludge
    accumulated in the reactor to a high concentration resulted in
    slow settlingvelocity or poor effluent quality, a portion of
    sludge should be wasted. Under normal operation condition, the
    SBR could serve as storage and thicking ofsludge in addition to
    chemical reaction. The experimental results showed thatthe
    thickened sludge concentration could be up to 6% of TS. For
    better sludge storge and thickening, it is suggested that the
    height of drainage nozzle would be located at 1/3 - 1/2 of the
    effective height from the bottom of SBR.
    Table of Content
    Reference
    Advisor
  • Tseng Dyi-Hwa(})
  • Files No Any Full Text File.
    Date of Submission

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