Why is energy efficiency important in wastewater treatment and what are two effective strategies?

Why is energy efficiency important in wastewater treatment and what are two effective strategies?

• A. Reduces operating costs and environmental impact; strategies include optimizing aeration (diffusers, DO control) and using VFDs or high-efficiency pumps; and optimizing sludge handling
• B. Increases throughput; strategies include doubling aeration and running pumps at max speed
• C. Is not important; strategies include ignoring DO and oversizing equipment
• D. Increases odors; strategies include adding more fans

Answer: (C)