The bio-solids being fed to the incinerator are 18% to 22% solids.  The bio-solids are pumped with a two piston concrete pump at the rate of 6 to 9 gpm into the fluidized sand bed of the incinerator.  The sand bed is made up of approximately 16,000 lbs of green lightening sand.  Diesel is used as an auxiliary fuel in order to maintain a bed temperature of 1400 degrees Fahrenheit.  The air supply is preheated to 1200 degrees Fahrenheit by a heat exchanger in order to reduce the auxiliary fuel consumption.  The pre-heated air is forced up through the bed of hot sand and causes the sand bed to be fluidized.  When the sand bed is fluidized it acts like boiling water.  1000 gallons of bio-solids can be burnt and it will only generate two quarts of ash that will need to be disposed of.

The addition of 50 gpm of water at the inlet to the Venturi is used to encapsulate the ash particles of the exhaust gases and drop the ash and water out for ultimate disposal.  The Venturi is used to create a pressure drop of 29" of water (1.03 psi).  The exhaust gases are then forced through a 4 stage tray cooler that has 200 gpm of water flowing in the opposite direction of the exhaust gases.  Each stage of the tray cooler has a plate with small holes in it that the air must flow through.  The water runs across the top of each plate and the exhaust gases bubble through the water.  The exhaust gases are reheated with a natural gas fired burner in order to eliminate the vapor plume for aesthetics.