OPTIMIZATION OF HOMOGENOUS OXIDATION PROCESS WITH HYGROGEN PEROXIDE USING BOX METHOD APPLIED FOR WASTEWATERS CONTAINING METHYLENE BLUE DYE?
CARMEN ZAHARIA*, DANIELA SUTEU “GH.ASACHI” TECHNICAL UNIVERSITY OF IAŞI, FACULTY OF CHEMICAL ENGINEERING AND ENVIRONMENTAL PROTECTION, DEPARTMENT OF ENVIRONMENTAL ENGINEERING AND MANAGEMENT, D. MANGERON BLVD, NO. 71A, IAŞI, ROMANIA *CORRESPONDING AUTHOR: CZAH@CH.TUIAŞI.RO
Delivery of textile or chemical wastewaters in river streams or pipeworks without an adequate treatment determines undesired consequences. Moreover, most dyes used nowadays are refractory compounds. Conventional biological treatments are not effective for most of synthetic dyes especially due to their polyaromatic structure. That is why advanced oxidation processes (e.g., H2O2/Fe2+) for decomposition of non-biodegradable organic contaminants into industrial effluents are attractive alternatives to conventional treatment. The paper proposes the study of homogenous oxidation (Fenton reagent) with hydrogen peroxide applied for some wastewaters containing Methylene Blue dye in different operational conditions in order to get the maximum decolourization removal using the empirical Box method. All kinetic experiments were performed on wastewater samples of 100 mL (100 mg dye/L) under continuing agitation, at a temperature of 17 ?C, pH of 6.5 and different concentrations (or volumes) of H2O2 and FeSO4 solutions. The methodology of the empirical Box procedure is experimentally applied and permitted to get the optimal values at pH = 6.5 for decolourization degree (92 %) that corresponds to 7.9 mL FeSO4 (stock FeSO4 concentration of 17.67 mmol Fe.L-1) and 1.18 mL H2O2 (stock H2O2 concentration of 8.235 mmol.L-1).
