Discussion
Consider the following statements about textile mill effluent.
1. Colour is often the most visible characteristic of the discharge.
2. The effluent typically carries a high chemical oxygen demand.
3. Effluent from dyeing is usually neutral in pH.
Answer: C
The first two are correct. The third is generally false, since reactive dyeing discharges strongly alkaline liquor and neutralisation is a routine part of the effluent plant. Colour is the hardest of the three to remove.
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