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Tannery wastewater contains large amounts of pollutants that, if directlydischarged into ecosystems, can generate an environmental hazard. The presentinvestigation has focused the attention to the remediation of wastewateroriginated from tanned leather in Tunisia. The analysis revealed wastewaterwith a high level of chemical oxygen demand (COD) of 7376 mgO2/L. Theperformance in reduction of COD, via electrocoagulation (EC) or UV photolysisor, finally, operating electrocoagulation and photolysis in sequence wasexamined. The effect of voltage and reaction time on COD reduction, as well asthe phytotoxicity were determined. Treated effluents were analysed by UVspectroscopy, extracting the organic components with solvents differing inpolarity. A sequential EC and UV treatment of the tannery wastewater has beenproven effective in the reduction of COD. These treatments combined afforded94.1 % of COD reduction, whereas the single EC and UV treatments affordedrespectively 85.7 and 55.9 %. The final COD value of 428.7 mg/L was foundlargely below the limit of 1000 mg/L for admission of wastewater in publicsewerage network. Germination tests of Hordeum Vulgare seeds indicated reducedtoxicity for the remediated water. Energy consumptions of 33.33 kWh/m3 and314.28 kWh/m3 were determined for the EC process and for the same followed byUV treatment. Both those technologies are yet available and ready for scale-up.

Efficient and Sustainable Treatment of Tannery Wastewater by a Sequential Electrocoagulation-UV Photolytic Process