305 (Desulfurization (Henshaw Zhu, 2001) Sublette Sylvester, 1987) (Beristain- Cardoso , 2008 - (Acidophilic) (Alkalophilic) (Krischan , 2012 Packed bed biofilters) Bioscrubbers) (Biotrickling filters Fortuny , 2008 20,000