Maneerat Wongudom และ Patiroop Pholchan. (2008) Removal of hydrogen sulfide from biogas using the biofilter inoculated with activated sludge cultures. Chulalongkorn University:ม.ป.ท.Maneerat Wongudom และ Patiroop Pholchan. 2008. Removal of hydrogen sulfide from biogas using the biofilter inoculated with activated sludge cultures. ม.ป.ท.:Chulalongkorn University;Maneerat Wongudom และ Patiroop Pholchan. Removal of hydrogen sulfide from biogas using the biofilter inoculated with activated sludge cultures. ม.ป.ท.:Chulalongkorn University, 2008. Print.