Abstract
The present work aims to use a two-stage biotrickling filters for simultaneous treatment of hydrogen sulphide (H2S), methyl mercaptan (MM), dimethyl sulphide (DMS) and dimethyl disulphide (DMDS). The first biofilter was inoculated with Acidithiobacillus thiooxidans (BAT) and the second one with Thiobacillus thioparus (BTT). For separate feeds of reduced sulphur compounds (RSC), the elimination capacity (EC) order was DMDS>DMS>MM. The EC values were 9.8gMM-S/m3/h (BTT; 78% removal efficiency (RE); empty bed residence time (EBRT) 58s), 36gDMDS-S/m3/h (BTT; 94.4% RE; EBRT 76s) and 57.5gH2S-S/m3/h (BAT; 92% RE; EBRT 59s). For the simultaneous removal of RSC in BTT, an increase in the H2S concentration from 23 to 293ppmv (EBRT of 59s) inhibited the RE of DMS (97–84% RE), DMDS (86–76% RE) and MM (83–67% RE). In the two-stage biofiltration, the RE did not decrease on increasing the H2S concentration from 75 to 432ppmv.
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