The feasibility of purifying hydrogen sulfide from waste gas by a biological biofilter was described.The experimental results revealed that the Thiobacillus,forming the biofilm on the surface of packing in the column,had a strong ability of purifying hydrogen sulfide.The biological elimination of hydrogen sulfide could reach to 95.1 g per hour per kiloliter packing with biofilm.When the concentration of hydrogen sulfide in inlet gas was lower than 2.3 g per kiloliter,the purification efficiency of hydrogen ...