Multiple choice

Setting test on a sample drawn from Aeration Tank liquor of ASP (MLSS = 2800 mg/I) was carried out with 1 litre sample. The test yielded a settled volume of 200 ml. The value of Sludge Volume Index shall be

  1. 14.0

  2. 34.2

  3. 71.4

  4. 271
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sludge Volume Index (SVI) is defined as the volume in milliliters occupied by 1 gram of activated sludge after 30 minutes of settling. SVI = (Settled sludge volume in ml/l * 1000) / MLSS in mg/l. Plugging in the values: (200 * 1000) / 2800 = 71.4 ml/g.

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