Abstract
Natural (AC-N) and electrochemical iron-modified activated carbon (AC-Fe-2.5A) were applied to treat wastewater with organic by-products generated by the manufacture of acrylic resins from methyl methacrylate (MMA) using batch and column systems. MMA wastewater has an extremely complex composition with a chemical oxygen demand concentration of 651.25 g O2/L, total organic carbon (TOC) concentration of 227.86 g/L, NH4 + concentration of 62.74 g/L, and 352,500 PtCo units. Wastewater was distilled to decrease the ammonium concentration with a removal efficiency of ammonium of 52 %. Then, Fenton oxidation was applied in order to promote the partial oxidation of organic matter; the molar dosage of Fe2+/H2O2 was 0.018/5.700 at pH 5.3. After distillation and oxidation processes, batch experiments using natural and iron-modified activated carbon were carried out in order to determinate the adsorption equilibrium time and capacities. The global removal percentages of TOC by oxidation–adsorption treatment were the highest at pH 2, 21.09 and 29.46 % for AC-N and AC-Fe-2.5A, respectively, and for color were most efficient at pH 4, 80.62 and 72.55 % for AC-N and AC-Fe-2.5A, respectively. The results showed that AC-Fe-2.5A was more efficient than AC-N for the removal of TOC. The electrochemical modification improves the adsorption capacities and properties of activated carbon.
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