Insight into Nano Zero-Valent-Copper Process for Degradation Dye Wastewater - Optimization by Box-Behnken Design and Toxicity Evaluation

This study focuses on utilization of a zero-valent metal (zero-valent iron, zero-valent aluminum, and nanoscale zerovalent copper) in conjunction with H2O2 2 O 2 conducted to treat real dye wastewater. Box-Behnken methodology was applied to describe effects of five independent factors involved in optimization of advanced oxidation system, which was type of zero-valent metals, dosage of zero-valent metals, pH, time and dosage of H2O2, 2 O 2 , for treating dye wastewater. Correlation coefficients for model, shown by the value R2, 2 , were 0.9996 for removing color and 0.9708 for reducing COD. Mass of nZVC equaled 1.09 g/L, H2O2 2 O 2 equaled 5.39 mg/L were found to be the optimal reaction conditions when the pH was equal to 3.71. After 120 minutes of optimal settings, there was a reduction of 87.3% in COD and 98.72% in color of dye wastewater after heterogeneous treatments (nZVC/H2O2). 2 O 2 ). The reusability of nZVC for degrading dye wastewater has been tested in four cycles and showed up to 70% COD removal. Ecotoxicological testing indicated that the raw textile effluent was extremely toxic to Chlorella sp. and V. fischeri. . Even while wastewater after treatment collected definitely had a lower toxicity level with both V. fischeri and Chlorella sp. This research findings highlight the nZVC/H2O2 2 O 2 process as a feasible and effective method for real dye wastewater treatment and detoxification, positioning it as a valuable alternative oxidation process for treating organic contaminants.