If you analyzed waste water directly after primary treatment, what would you notice?

Asked in WBCS Main Paper 4 2022 · Topic: Pollution (Water Pollution: Sources, common pollutants, water quality indicators (BOD, COD, DO), effects, control measures.)

1. Harmful bacteria and other biological agents have been killed or removed
2. The water is potable
3. Much of the dissolved solids have been re‐ moved
4. Many suspended solids have been removed

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