Which of the following is a characteristic of forced draft aeration?

Forced draft aeration is characterized by the use of a fan or blower to actively introduce air into water or another liquid, enhancing the transfer of oxygen and removal of volatile substances. This method is particularly effective because it creates a controlled environment where air can be efficiently mixed with the liquid, often leading to improved performance in terms of aeration rates.

The use of a fan allows for consistent and adjustable air flow that can be tailored to specific treatment requirements, making forced draft aeration a reliable option in various water treatment contexts. This distinguishes it from other methods that might depend on external environmental factors, such as natural wind currents, which can be more variable and less controllable.

Forced draft aeration does not inherently require high temperatures, as its primary mechanism is the physical introduction of air rather than temperature-based processes. Additionally, while aeration methods can vary in efficiency, forced draft aeration has been designed to optimize performance, and dismissing it as the least efficient method does not recognize its advantages in certain applications.

In summary, the defining feature of forced draft aeration is the incorporation of a fan to facilitate the introduction of air, making it distinct and effective compared to other aeration methods.