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Drying Poultry Layer Manure: How the Air Swept Tubular Dryer Promotes a Sustainable Fertilizer

Layer manure is excreta from laying hens during the stage of layer hen development or egg production. It may also be mixed with feed waste as well as feathers. According to Clemson University, poultry manure contains all thirteen of the essential plant nutrients that plants use. Those include nitrogen (N), phosphorous (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), manganese (Mn), copper (Cu), zinc (Zn), chlorine (Cl), boron (b), iron (Fe), and molybdenum (Mo). As our economic model adopts the notion of a circular economy, Scott Equipment Company continues to offer solutions to supply chains historically defined by “take-make-waste.”


Scott Equipment Company showcased its Air Swept Tubular (AST) drying system this year at the International Production & Processing Expo (IPPE).

The AST dryer is a pneumatic, flash-drying system designed for rugged duty and is versatile enough to be utilized in many different industries. We had the opportunity to discuss our drying system technology with industry professionals attending IPPE from all over the world. Compared to competitive alternative technologies, one of the benefits discussed with many was the ability of the AST dryer to deagglomerate the material while drying, all in one step.

 This feature is an important differentiating factor in that the AST dryer has four agitator plates at the inlet of the machine to reduce the product into small pieces and provide a highly turbulent one for efficient heat transfer. The smaller particle allows for a more efficient transfer of heat to the material, which is an important consideration for flash drying.


More recently, Scott Equipment has been supporting end-users with drying solutions for raw poultry manure, which is then pelletized, cooled, and packaged for distribution as an organic fertilizer. End users should also know that the AST drying system is supplied complete with means of feeding, a gas-fired burner management system and skid-mounted valve train, a process receiver (baghouse), an exhaust fan that draws air through the system, as well as a control management system.

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