Question
Download Solution PDFMatch List I with List II and select the correct answer from the combinations given below:
List I
List II
a. Sludge volume index
1. Settling in primary sedimentation tank.
b. Thickening of sludge
2. Settling in secondary sedimentation tank.
c. Scum removal
3. Filtration in trickling filter.
d. Recycling of effluent
4. Activated sludge process.
| List I | List II |
|---|---|
| a. Sludge volume index | 1. Settling in primary sedimentation tank. |
| b. Thickening of sludge | 2. Settling in secondary sedimentation tank. |
| c. Scum removal | 3. Filtration in trickling filter. |
| d. Recycling of effluent | 4. Activated sludge process. |
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Sludge Volume Index
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Sludge Volume Index (SVI) is the volume occupied by 1 gram of suspended solids after 30 minutes of settling.
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It is an important parameter in the activated sludge process to assess the settling characteristics and health of the biological sludge.
Thickening of Sludge
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Thickening involves increasing the solids concentration of sludge by allowing it to settle and compact, commonly performed in secondary clarifiers where biological solids settle.
Additional Information Scum Removal
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Scum consists of floating materials such as oils and grease that rise to the surface in primary sedimentation tanks and must be removed by mechanical or manual skimming.
Recycling of Effluent
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In trickling filters, part of the effluent is often recycled to maintain hydraulic loading, improve contact time, and stabilize the biological film.
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This enhances treatment efficiency, especially under varying load conditions.
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