Patent ID: 6235248
Filing Date: 2001-05-22
Classification: B01D,Y02A,Y02E

Abstract:
Apparatus for purifying flue gas, comprising:a gas scrubber which in use contains denitrifying biomass; said scrubber having a gas inlet for flue gas to be treated, a gas outlet for purified gas, an inlet line entering said scrubber at a first point for adding electron donor for the denitrifying biomass, and contact means comprised of nozzles and packing material for effectively bringing the gas and liquid into contact; said packing material structured and arranged to retain the denitrifying biomass in said gas scrubber;at least a first liquid anaerobic bioreactor which in use contains sulfate and sulfite reducing biomass;at least a second liquid aerobic bioreactor which in use contains sulfide oxidizing biomass;a solids separator fluidly connected to said second liquid aerobic bioreactor;a first connecting line between said gas scrubber and said first liquid anaerobic bioreactor;a second connecting line between said first liquid anaerobic bioreactor and said second liquid aerobic bioreactor; anda third connecting line between said solids separator and said gas scrubber; said third connecting line entering said scrubber at a second point distinct from said first point.