Abstract. The paper presents some data from our laboratory-setup experiments of homogenous oxidative processes with hydrogen peroxide (i.e. advanced Fenton oxidation processes) applied for Remazol Rosso RB dye-containing aqueous systems, especially textile effl uents. Therefore, some different operating parameters (including pH, concentration of dye, H 2 O 2 and ferrous ions, oxidation time, temperature, stirring regime, among its) were tested for determination of the best performance in effl uent discoloration and dye removal, meaning the optimal values of each studied parameters for highest discoloration or dye removal. For an effl uent loaded with 50 mg/L Remazol Rosso RB dye, there were applied these optimal values that correspond to > 97 % discoloration effi ciency performed with 88.24 mM H 2 O 2 , 0.18 mM FeSO 4 , at pH (5.16), temperature of 19-20°C, continuous stirring regime (30 rpm) and minimum 25-30 minutes of homogenous advanced oxidation treatment. If there are not used additional chemical reagents for pH adjustment (minimization reason of treatment operating cost), the performance of this oxidative treatment is closed to above mentioned effi ciency by after a higher oxidation time (> 90 min). These results are encouraging and sustain this oxidative process application and optimization for reducing the environmental impact of effl uent discharging directly in different natural aquatic receptors and compliance with admissible limits imposed by environmental legislation as well.Keywords: discoloration, Fenton reagent, homogenous advanced oxidation process, optimal operating parameter, Remazol Rosso RB dye, textile effl uent treatment. IntroductionIn the whole world even in the most hardly accessible for tourist geographic zones, the water quality is negatively changing, and the pollution level of natural surface water resources is greatly increasing. One of the most important causes is the non-corresponding quality of fi nal colored or not effl uent discharged in natural water resources (water courses or accumulation lakes). Therefore, the wastewater or individual/fi nal effl uent treatment must continue to be one of priorities in environmental management (in terms of integrated production water management) even if an environmental prevention and control scheme was implemented in the productive/commercial unit for reduction of generated loaded wastewater amounts, among others. The treated effl uents are indicated to be inside recycling/ reuse for reduction of fresh water amount in each manufacturing process. One of recognized and viable emerging wastewater treatments in the scientifi c literature [1][2][3][4] is the advanced oxidation process (AOP) (or mineralization) of polluting compounds from wastewaters to carbon dioxides and/or other harmless species. A special attention was given for Fenton and/or Fenton-like oxidation processes applied for discoloration or dye removal purposes, together with its advantages (i.e. high effi ciency, short operating time, simplicity in destroying the contaminants, ...
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