A research on purifying foul-gas containing H2Sin low concentrations using a biofilm -packing colum n w as done.The experim ental result of show that the desulfurizing-bacteria got from a m unicipal sew age plant have a good capacity for desulfurization.The biofilm -packing colum n inoculated w ith the desul- furizing-bacteria,w hen the concentrations ofH2Sin influent gas w as 2.2m g/L,the purification efficiency of H2Sin gas could reach 95% ,the m axim um biologicalelim ination capacity ofper liter pac...