Multiple choice question for engineering Set 1 1. How many types of aerators are commonly used in the treatment of wastewater? a) 2 b) 3 c) 4 d) 5 2. Organic contaminants are removed from the wastewater by a) Water softening b) Demineralization c) Absorption d) Adsorption 3. By which process, odor producing substances is…

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