What are the mechanical components of package plants?
First and foremost is the motor and blower unit. The blower is the piece of equipment which provides air to the system and the motor drives the blower. There are electric controls which activate the motor/blower unit, usually through a timer. There may be a pumping station pumps ahead of the system if the sewer line reaches the treatment system at too low of an elevation. Pumps will also be present if the system has a flow equalization tank or a dosing tank. All pump systems have controls to turn them on and off. These are usually mercury level control floats which can be set at the desired on and off levels. Air is introduced into the aeration tank through pipes called air diffuser drops. These diffuser drops extend off of the air header pipe which originates at the blower. An air check valve is usually present at each blower to prevent any backflow of air. Hydraulic air lifts are used in the clarifier to provide return activated sludge to the aeration tank and to skim surface scum. T
