Define the term sludge. Name two chemicals that are used to disinfect water? [2 MARKS]

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Solution

Definition: 1 Mark
Each Disinfectant: 0.5 Marks

When wastewater is allowed to settle in a large tank, solids like faeces settle at the bottom of the tank. The solid waste at the bottom of the tank is known as sludge.

Two chemicals that are used to disinfect water are:

Ozone

Chlorine

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