There are two uses. One is to add oxygen to the biochemical aerobic bacteria to ensure their living environment and meet the needs of sewage treatment. Two is ventilation, because most sewage treatment use biochemical reaction, will produce some methane and other decomposition gases, smell bad at the same time with a certain risk, in order to ensure safety and improve the environment, the site environment should be ventilated. The blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base (and oil tank), drip nozzle. The blower is operated eccentrically by the rotor offset inside the cylinder, and the volume change between the blades in the rotor slot will suck, compress and spit out the air. During operation, the pressure difference of the blower is used to automatically send lubrication to the oil drop nozzle and drop it into the cylinder to reduce friction and noise, and at the same time to keep the gas in the cylinder from backflow. This type of blower is also known as the slide vane blower.