Treatment of real wastewater from the graphic industry using advanced oxidation technologies: degradation models and feasibility analysis

PAMELA RAMOS; GLADYS NORA EYLER; VIVIANA COLASURDO; PAULA VITALE; MARÍA B. FERNÁNDEZ

JOURNAL OF CLEANER PRODUCTION

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2019 p. 1041 - 1050

0959-6526

Many organic contaminants present in industrial effluents are resistant to conventional treatments. Theapplication of Advanced Oxidation Technologies (AOT´s) to a system of great complexity and unknowncomposition was studied. The proposed AOT´s arise from the combination of UV light irradiation (254 nm)in the presence of commercial steel wool (CSW - zerovalent iron) and H2Oas an oxidant, resulting indegradation processes by UV photolysis, UV/H2O2,Fe/H2O2and UV/H2O22/Fe. The system used was aneffluent from a graphic industry. High organic load and low biodegradability are characteristics of thesewastewaters. The CSW was characterized by SEM/EDS. The effect of pH, H2O2concentration, mass of CSW,intensity of UV light and temperature on the reduction of chemical oxygen demand (COD) of the effluentwas evaluated employing a screening design. Afterwards, significant factors ([H2O], light intensity andtemperature) were selected to study their effect on COD reduction employing a central composite design.Optimum operating conditions predicted (0.06 mol L1of H2O2,UV254 nmof 1.6 1025CatpH ca. 6.5.) generated an experimental COD reduction of 98.22% at lab scale. These conditions were alsotested at pilot scale. Furthermore, phytotoxicity of treated effluents was analyzed.