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| Q. |
For treating the sewage of a large city, you will recommend |
| A. | A sedimentation tank and an activated sludge treatment plant |
| B. | A plant consisting of Imhoff tanks with low rate trickling filters |
| C. | Sedimentation tanks with high rate trickling filters |
| D. | None of these |
| Answer» A. A sedimentation tank and an activated sludge treatment plant | |
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