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Question : Classify degradable pollutants.

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Solution :Based on the time taken to breakdown into their ingredients, degradable pollutants are classified as rapidly degradable (non-PERSISTENT) and SLOWLY degradable (persistent).
a) Rapidly degradable or non-persistent pollutants: These can be broken down by natural processes. DOMESTIC sewage and vegetable waste are examples of such pollutants.
b) Slowly degradable or persistent pollutants: These are pollutants that remain in the environment for many years in an unchanged condition and take decades or longer to DEGRADE, as in the case of DDT.


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