Andersen 2000 Inc and Montair Andersen bv manufacture three different types of sulfur dioxide removal systems. The first system is a packaged unit for industrial boilers, industrial plant exhaust gases, metal smelting operations, and small utility plant steam boilers burning coal or oil. This system uses either sodium hydroxide or sodium carbonate to absorb the sulfur dioxide. Either the patented low energy spray-baffle scrubber, or a venturi scrubber is used if the gas stream has any significant particulate matter content. If there is no particulate matter in the exhaust gas stream, a counterflow packed bed scrubber can be used. For larger industrial sources and for large utility plants, we manufacture a double alkali sulfur dioxide removal system. This system can be combined with particulate collection scrubbers for coal fired sources, or can be connected to the discharge from an electrostatic precipitator or fabric filter.

For oil fired sources, only the spray-baffle type, low energy scrubber is required. In this system, sulfur dioxide is absorbed into a sodium sulfite solution. The resultant bisulfite which is formed is converted back to sodium sulfite by the addition of a calcium precipitating agent. The precipitated calcium compounds are then filtered from solution and disposed of as dry solids. This system offers advantages over lime and limestone scrubbing systems of eliminating problems with scale formation in the scrubber, and reduces substantially the size of the absorption equipment which is required. This same system can be used for sulfide ore smelting operations to remove sulfur dioxide and sulfur trioxide emissions. Numerous package units are available for smaller sources, and custom designed units are available for higher emission rates. Spray dry-absorption systems are available for dry removal of sulfur dioxide and our newest wet-dry process is unique in the industry, offering high efficiency of wet absorption with no liquid waste to handle.