Successful application of UASB in treatment of rich organic S-bearing wastewater.
Sulfate in effluent was higher than influent at COD/SO4
2 ratio of 8 and 5.
Conversely, sulfate in influent was higher than effluent at COD/SO4
2 ratio of 1.5.
Archaea and bacterial community varied greatly with altered OLR.
Some species can be responsible for S release from organic sulfur compounds.