The sorption of SO2 by sodium bicarbonate, nahcolite, hydrated dolomitic lime, promoted hydrated dolomitic lime, and hydrated lime was studied using a full scale pilot fabric filterhouse as the chemical contactor under various operating conditions. A total of 62 tests was performed to determine the effects of sorbent stoichiometric ratio, operating temperature, flue gas flow rate (filter ratio), mode of house operation, method of sorbent feeding and sorbent retention time. For the experiments conducted, gas temperatures ranged between 270F and 640F; flow rates between 7,500 ACFM and 15,000 ACFM; sorbent to SO2 stoichiometric ratios from 0.75 to 3.4 and sorbent retention time from 2.5 seconds to 6 seconds. Tests were also conducted to determine how much of the SO2 removal was taking place while the sorbent was in suspension and how much was taking place in the filtercake on the bags. Measurements of NO2 were also made during the tests. It was definitely shown that the fabric filter can perform adequately as an effective chemical contactor for removal of SO2 from the flue gas as well as a control device for flyash. Of the various filterhouse operating parameters tested, the operating temperature and the stoichiometric ratio have the strongest effect on SO2 conversion efficiency. (Author)