17 



Table 3. Sulfur oxidation reactions by certain 

 species of thiobacilli (from Burns, 

 1967) . 



Thiobacillus thioparus 

 S 9 3 2 " + H 2 + 40 2 - 5S0 4 2 ~ + H 2 S0 4 + 4S 



S,0, 2 " + CO 2 ~ + MX ■* 2S0. + C0„ + 2S 

 4 6 3 2 4 2 



2S 4- 30, + 2H.0 -> 2H o S0. 

 2 2 2 4 



2KSCN + 40 2 _ 4H 9 -> (NH 4 ) ? S0 4 + K 2 S0 4 + 2C0 2 



S 2 o 2 " + 20 9 + H 2 - S0 4 2 " 4- H 2 S0 4 



S,o/~ + 70, + 6H,0 -> 2S0 2 ~ + 6H.S0. 

 4 6 2 2 4 2 4 



T. thiooxidans 

 S 2 3 2 ~ + 20 2 + H 2 + S0 4 2 " + H 2 S0 4 



2S + 30 ? + H 9 -> 2H ? S0 4 



2S,0 2 " + 70, + 6H,0 -> 2S0, 2 " + 6H_S0. 

 4 6 2 2 4 2 4 



T_. denitrificans 

 2S + 30 + 2H ? -> 2H 2 S0 4 



- 2— 



5S + 6N0 3 + 2H -*■ 3S0 4 " 4- 2H 2 S0 4 + 3N 2 



(anaerobically) 



S 3 2 + 20 9 + H ? + S0 4 2 + H 2 S0 4 



:S,0 2 ~ 4- 70, 4- 6H,0 -*• 2S0 ~ 4- 6H„S0. 

 4 6 2 2 4 2 4 



2SCN 4- 40, + 4H,0 ■* (NH, ) .SO. + SO ." + 2C0. 

 2 4 2 4 4 2 



' + H 2 S0 4 + 4N 2 



(anaerobically) 



5S 2 3 2 4- 8N0 3 + H 2 ■+ 9S0 4 4- H ? S0 4 4- 4N 2 



T_. novellus 

 S ? 3 2 ~ 4- 20 2 4- H + S0 4 " 4- H 9 S0 4 



2S,0 2 ~ 4- 70, 4- 6H,0 + 2S0. " 4- 6H„S0, 

 4 6 2 2 4 2 4 



