1. Pick up the incorrect statement from the following :
2. The sludge does not contain waste water from
3. The water carried sewerage system removes
4. In a city the ratio of the drainage_ to sewage is 20, the percentage discharge passing through non-monsoon periods, is
5. The sewerage system originates from
6. The sewer which transports the sewage to the point of treatment, is called
7. Pick up the in-correct statement from the following :
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