Destruction of organic pollutants in reusable wastewater using advanced oxidation technology

This work studied the destruction of various M–EDTA complexes and trace organic pollutants in treated reusable wastewater under advanced oxidation using UV irradiation and ozonation. Effect of dosage of hydrogen peroxide and acidity of reaction matrices on oxidation efficiencies were investigated. The rate constant of mineralization presents a decreasing trend as Fe(III)–EDTA > Fe(II)–EDTA > Al(III)–EDTA > Pb(II)–EDTA > Na(I)–EDTA > Zn(II)–EDTA > Cu(II)–EDTA. The mineralization efficiencies using ozone alone are 15%, 40% and 15% for the water samples after reverse osmosis (RO), microfiltration (MF) and superfiltration (SF) processes, respectively. The presence of hydrogen peroxide in photochemical reaction matrixes can effectively enhance the mineralization of organic carbon species. When 150 mg l−1 of H2O2 was added in the effluents, the mineralization markedly increased to 80%, 92% and 89%, respectively.