Ozone, Hydrogen Peroxide/Ozone And UV/Ozone Treatment Of Chromium- And Copper-Complex Dyes: Decolorization And Metal Release

Physicochemical characterization and Bioremediation perspective of textile effluent, dyes and metals by indigenous Bacteria

“…There was a gradual change in the color from brown/blue to grey/black of the effluent from source to the sink indicating sign of decolorization. The decreasing color intensity of the effluent has been related to adsorption/chemical transformation of dyes (including metal complex) by biotic and abiotic component of the effluent [30][31][32]. The increasing bacterial count at sink might have been responsible for such color change in the present study.…”

Treatment and reuse of reactive dyeing effluents

“…Ozone especially attacks the double bonds which are responsible for coloration. For this reason, decolorization of wastewater by ozone alone is not always accompanied by a significant reduction of the COD [24][25][26]. Moreover, the installation of an ozonation process involves additional costs [27].…”

Coagulation–flocculation–decantation of dye house effluents: concentrated effluents

“…The electrochemical process [17,18] requires an electrolysis cell containing iron electrodes around which the dyeing effluent circulates. The ozone [12,[19][20][21][22][23] attacks the double bonds responsible for the coloration. For this reason, the discoloration of an effluent by the ozone alone is not always accompanied by a significant decrease of the COD.…”