We propose in this study the effectiveness of an organic membrane Nanomax50 charged negatively on complex solution tanneries. Our choice was made on the solutions of tanning and liming of the tannery tawing of Rouiba/Algiers because of the nature of the substances which they contain, namely chromium and sulphides. Initially, of the pretreatments by precipitation and coagulation flocculation respectively with the solutions of tanning and liming are planned in order to avoid the filling of the membrane. The products used at these stages are FeSO4-HCl-Ca(OH)(2). After each stage of pretreatment, the Nanofiltration is used in order to study the behavior of the membrane with respect to the composition of the solution with various stages. The parameters of studies under consideration in this study are as follows: pH, electric conductivity, turbidity, concentration chromium plate some by atomic absorption.