... sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p content of TiO2 than 0.75%, water content than 0 ... deposits, thus removing sulfide, phosphate, sulfate, with examples of sulfur wastewater treatment textiles. 3, a reductant, ferrous sulfate is ... following proportions of chromium-containing waste water reduction hexavalent chromium cr3 +, replace expensive by sodium sulfite, aw, sulfur dioxide, ...