Control of Thiothrix in activated sludge.

Filamentous bacteria of the genus Thio thrix are fr quently associated with activated sludge bulking.1?2 The rea sons for the growth of Thiothrix in ac tivated sludge have not been established, but it is known that these microorganisms are sulfur bacteria. As part of their me tabolism, they seem to oxidize some com bination of hydrogen sulfide, bisulfide, and sulfide ions to elemental sulfur with the