Decolorization of Biologically Treated Effluents of Waste Molasses and Piggery Wastewater by Fenton Reaction

Waste molasses was diluted to 10%, coagulated with 800 mg/L polyaluminum chloride, and then
treated in an activated sludge sequence batch reactor with a total organic carbon (TOC) loading of 0.2
kg/kg per day. Sodium hypochlorite and 3 mmol of iron sulfate solution were added to the supernatant
in a 1:1 molar ratio. As a result, the treated water had a chromaticity of 14. Biologically treated
livestock wastewater was treated in a continuous Fenton experiment for 6 h using hydrogen peroxide
and iron powder. From an initial color loading of 653, the treated water was significantly decolorized to
84.