Treatment of waste gas containing low concentration of dimethyl sulphide (DMS) in a bench-scale biofilter

Biological treatment of dimethyl sulphide (DMS) was investigated in a bench-scale biofilter, packed with compost along with wood chips, and enriched with DMS degrading microorganism Bacillus sphaericus. The biofilter could remove 62–74% of the inlet DMS, at an optimum loading of 0.484 g/m3/h with optimum empty bed contact time (EBCT) of 384 s and an average moisture range of 65–70%. The biodegradative products of DMS were sulphide, thiosulphate and sulphate. Evaluation of microbiological status of the biofilter indicated the presence of other bacterial cultures viz. Paenibacillus polymyxa, and Bacillus megaterium, besides B. sphaericus.