OPTIMIZATION OF ELECTRO-FENTON PROCESS APPLIED TO THE TREATMENT OF BRINES IN A CONTEXT OF INDUSTRIAL SYMBIOSIS

abstract

This work aimed to optimize the electro-Fenton process applied to the treatment of contaminated brines from the cod industry for later use in the pickling stage of the tannery industry. Central composite experimental design and response surface methodology were used to evaluate the effects of current intensity (1.2 – 2.8 A), electrolysis time (5.0 – 15.0 min), and H2O2 concentration (150 – 250 mM), using iron electrodes, on the removal of total organic carbon (TOC) from real saturated cod brine. The optimal operating conditions obtained were: 2.83 A current intensity, 3.40 min electrolysis time and 146 mM H2O2 concentration, allowing for 41 % removal of TOC. Diluted treated brines ( 7.5 – 8.0 % wt. NaCl) were tested in hide pickling trials. The quality of the hides was not affected when pickled with treated brine, so the conditions are met to establish a symbiosis between the cod and the tannery industry.

authors

Luana Sarinho, Pedro Carvalho, Diana Patoilo, Ana Santos, João Peres Ribeiro, Maria Isabel Nunes

our authors

acknowledgements

CENTRO-01-0247-FEDER-069712

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