In this work, we treated wastewater from the detergent manufacturing industry on natural carriers and by-products from a coal-fired thermal power plant. The filtration was carried out by infiltration- percolation using a vertical cylindrical column manufactured in our laboratory. The main parameters analyzed before and after treatment are: suspended matter (SM), chemical oxygen demand (COD), biochemical oxygen demand (BOD5) and pH. This treatment system achieved a reduction of 89% COD, 73% BOD5, 54% SS and (66-99%) heavy metals. The COD/BOD5 rejection ratio before treatment, which was greater than 4.24, has become less than 1.73. Thus, impedance measurements of the wastewater before and after treatment were carried out. The results of the electrical parameters deduced from the impedance spectra show a good correlation with the parameters obtained by the classical methods.

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