of the dissolved zinc was removed by precipitation and/or flotation
of the pollutants and only one portion stayed dissolved in the effluent
(Table 3).
Regarding eco-toxicity, the EC20 value, at the beginning and
after the treatment, was not measured by the equipment, because
the most dilute solution of the method has still the ability to inhibit
more than 20% of bacteria, and the EC50 value decreased from 4% to
3% after the application of the ECG process, which means that the
treatment failed to remove the toxicity of the effluent.
Moreover, the obtained electrical energy consumption result for
the real wastewater was 34 kW h/m3
. This value is somehow lower
than the one achieved for the synthetic effluent (40 kW h/m3
) possibly
due to its higher conductivity for the electrical current of
5.94 mS/cm (Table 1), resulting then in a lower resistance of the
medium and a lower power consumption by the process.