Optimization of industrial wastewater treatment process

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Grazia Leonzio

University of L’Aquila, Italy

: Expert Opin Environ Biol

Abstract

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The developemt of industries is releated to continued efforts to find the better wastewater treatment processes. The aim of this research is to optimize and evaluate the technical and economical feasibility of industrial wastes treatment plant. Different kinds of wastewaters with heavy metals, with oil emulsions, with chrome, with surfactants, spent pickling liquors are treated. Chemical-physical and biological treatments are reproduced in laboratory tests to find the better operating conditions. In addition to measurements of COD and total solids, values of OUR are carried out to have the disposal facility in the Fenton reactor, used for biological treatment. Results suggest that in chemical-physical treatment, it is preferable to achieve a maximum value of pH equal to 7.5 with the addition of acid waste and Ca(OH)2 solution. To break the emulsions, solution of Aquafil 60 AP at 10% is used. Values of COD, OUR, total solids are respectively equal to 4920 mgO2/L, -0.494 mgO2/Lmin, 17.63 g/L. Clarified fraction is 79% while mud filtrate fraction is 21%. The optimal conditions for Fenton reactor are: 12.5 mL of ferrous sulfate solution, 0.3 mL of hydrogen peroxide solution, initial pH between 2 and 3. A modeling of the process is developed with Pro II software using the better operation conditions obtained in the experimental analysis. Treating 10 m3/h of feed, the process has at the outlet 49 kgO2/h of COD with a reduction of 89%. The VAN is 35769000 €: the process is economical feasibility. Future researches should verify the obtain results in the real plant.

Biography

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Email: grazia.leonzio@graduate.univaq.it