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Sludge Volume Index (SVI) is a process control parameter used to describe the settling characteristics of sludge in the aeration tank of an activated sludge process. It was introduced by Mohlman in 1934, and has become one of the standard measures of the physical characteristics of activated sludge processes. The SVI is often used to assess if process performance issues are related to the proliferation of problematic filamentous organisms that cause poor settling in secondary clarification processes.

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  • L'indice de Mohlman (IM) est l’indice de l'aptitude à la décantation des boues. Cet indice définit (en millilitre) le volume de boue activée décanté en 1/2 heure par rapport à la masse de résidu sec de cette boue (en gramme de matières). Il est également appelé indice de volume d’une boue (IVB) ou SVI de l'anglais sludge volume index. Il a été introduit par Mohlman in 1934. (fr)
  • Sludge Volume Index (SVI) is a process control parameter used to describe the settling characteristics of sludge in the aeration tank of an activated sludge process. It was introduced by Mohlman in 1934, and has become one of the standard measures of the physical characteristics of activated sludge processes. The SVI is often used to assess if process performance issues are related to the proliferation of problematic filamentous organisms that cause poor settling in secondary clarification processes. It is defined as 'the volume (in mL) occupied by 1 gram of activated sludge after settling the aerated liquid for 30 minutes' and can be calculated as follows: SVI (mL/g) = settled sludge volume (mL/L)/mixed liquor suspended solids(MLSS)(mg/L) * 1000 (mg/g) The sludge is often too thick and has to be diluted with clarified secondary effluent before analyzing the SVI. In the diluted SVI (DSVI) test, the sludge sample is serially diluted until the 30-minute sludge volume is less than 200 mL. Clarified (or filtered) secondary effluent is used to prevent osmotic stress on the biomass that may affect the outcome. The modified equation for determining the DSVI is: DSVI (mL/g) = diluted settled sludge volume (mL/L)/MLSS (mg/L) * 1000 [mg/g] * (total volume [mL]/original sludge sample volume [mL]) (en)
  • L'indice di volume del fango (in inglese sludge volume index, abbreviato in SVI) è una misura usata nel campo dell' per valutare le proprietà di sedimentabilità di un fango. È quindi utile per il dimensionamento dei comparti di sedimentazione degli impianti di depurazione. L'indice viene misurato in laboratorio in base al volume occupato da un'unità di fango sospeso dopo 30 minuti di sedimentazione. SVI=volume del fango sedimentato [ml/l] / quantità di solidi sospesi [mg/l] Generalmente un indice SVI più alto è sinonimo di peggiori caratteristiche di sedimentabilità. (it)
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  • L'indice de Mohlman (IM) est l’indice de l'aptitude à la décantation des boues. Cet indice définit (en millilitre) le volume de boue activée décanté en 1/2 heure par rapport à la masse de résidu sec de cette boue (en gramme de matières). Il est également appelé indice de volume d’une boue (IVB) ou SVI de l'anglais sludge volume index. Il a été introduit par Mohlman in 1934. (fr)
  • L'indice di volume del fango (in inglese sludge volume index, abbreviato in SVI) è una misura usata nel campo dell' per valutare le proprietà di sedimentabilità di un fango. È quindi utile per il dimensionamento dei comparti di sedimentazione degli impianti di depurazione. L'indice viene misurato in laboratorio in base al volume occupato da un'unità di fango sospeso dopo 30 minuti di sedimentazione. SVI=volume del fango sedimentato [ml/l] / quantità di solidi sospesi [mg/l] Generalmente un indice SVI più alto è sinonimo di peggiori caratteristiche di sedimentabilità. (it)
  • Sludge Volume Index (SVI) is a process control parameter used to describe the settling characteristics of sludge in the aeration tank of an activated sludge process. It was introduced by Mohlman in 1934, and has become one of the standard measures of the physical characteristics of activated sludge processes. The SVI is often used to assess if process performance issues are related to the proliferation of problematic filamentous organisms that cause poor settling in secondary clarification processes. (en)
rdfs:label
  • Indice de Mohlman (fr)
  • Indice di volume del fango (it)
  • Sludge volume index (en)
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