Some Remarks on Settling Characteristics (<I>SV<SUB>30</SUB></I> and <I>SVI</I>) of Activated Sludge

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  • Matsuzaki Harumi
    Hitachi Research Laboratory, Hitachi Ltd.
  • Takahashi Sankichi
    Hitachi Research Laboratory, Hitachi Ltd.
  • Zhu Hong Li
    Hitachi Research Laboratory, Hitachi Ltd. Shanghai Institute of Environmental Protection, the People's Republic of China
  • Oguri Takaaki
    Hitachi Research Laboratory, Hitachi Ltd. Hitachi Plant Eng. and Construction Co., Ltd.

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  • 活性汚泥の沈降性（ＳＶ３０およびＳＶＩ）に関する一考察
  • カッセイ オデイ ノ チンコウセイ SV30 オヨビ SVI ニ カンスル イ

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Effects of MLSS concentration, (MLSS) o, and measuring cylinder dimensions on SV30 and SVI were studied through activated sludge treatment experiments using synthetic waste water.<BR>It was shown that the interface sedimentation velocity, dx/dt, was expressed as the function dx/dt=k/ (MLSS) 2.4, where k was the interface sedimentation velocity coefficient and (MLSS) was MLSS concentration under the interface in a measuring cylinder, and also that the settling characteristics of the activated sludge could be evaluated by SVI values in the small range of (MLSS) o, because SVI values were dependent on (MLSS) o and water depth in a measuring cylinder, h.<BR>Therefore, it was shown that the settling characteristics of activated sludge could be evaluated by k values which were independent of (MLSS) o and h, and representing more truly the settling characteristics of activated sludge on the basis of microscopic observation rather than SVI values.

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