Sludge volume index is defined as the ratio of

- 1
  
  percentage of sludge by volume to percentage of suspended solids by weight
- 2
  
  percentage of sludge by volume to percentage of total solids by weight
- 3
  
  percentage of suspended solids by weight to percentage of sludge by volume
- 4
  
  percentage of total solids by weight to percentage of sludge by volume

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