Positive displacement blowers are mechanical devices that move air or gas by trapping a fixed volume and forcing it into a discharge pipe. They operate by creating a vacuum that draws in air, which is then compressed and expelled. This type of blower is commonly used in various applications, including wastewater treatment, pneumatic conveying, and aeration. These blowers are known for their efficiency and ability to maintain a constant flow rate, regardless of pressure changes. They come in different designs, such as rotary lobe and gear, each suited for specific operational needs. Positive displacement blowers are essential in industries requiring reliable air movement.