TREATMENT OF SALT FROM HIDES CURING STAGE BY ELECTROCOAGULATION

abstract

The main goal of this work was to valorize a contaminated salt coming from the preservation of hides, through the treatment of the respective salt-derived brine by iron-driven electrocoagulation (EC) process, aiming at its future use in the pickling stage of the tanning industry. Focusing on reduce the brine’s organic load (total organic carbon, TOC), the effects of electrolysis time (7.0 – 13.0 min) and current intensity (1.0 – 7.0 A) on the treatment of salt-derived brine ( 7.5 % wt. salt) were evaluated. The treated brines were then tested in pickling trials to assess their final quality. From the results obtained, suitable EC operating conditions were proposed: electrolysis time range 7 – 13 min and current intensity range 1 – 2 A, allowing for 75 – 80% removal of TOC. Therefore, the curing salt can be valorized within the same industry being redirected, after treatment, to another production stage, instead of landfilled.

authors

Luana Sarinho, Pedro Carvalho, Diana Patoilo, João Peres Ribeiro, José Baião da Cruz, Maria Isabel Nunes

our authors

acknowledgements

CENTRO-01-0247-FEDER-069712

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