The dumping of tanneries is a severe pollution problem because it generated wastewater full of chemical and toxic substances which deteriorate the water sources and the health of organisms that are living there. The aim of this project was to determine the removal capacity of the total chromium (Cr) and chlorides (Cl-) present in the wastewater of the tanneries by the bioremediation with the Chlorella sp. and Scenedesmus sp. microalgaes, orange peels and citrus pectin. The methods applied were: i) the inoculation of a single or mixture microalgaes in the 434 Victor Alfonso Ramirez Losada et al. water of tanneries for a period of 24 or 48 hours (h), or a photoperiod 12h:12h (light:darkness); ii) orange peels with particle sizes: 0.5mm, 1.0mm and 2.0mm, were exposed to residual water during 2h, 4h or 6h with a rate of 0.5g/100mL; and iii) citrus pectin with equal parameters of those used in the orange peels. The initial concentration of residual water was Cr=352.2 mg/L and Cl-=25100 mg/L. The Scenedesmus sp. algae removed 98.63% (4.82 mg/L) of Cr and 54.18% (11500mg / L) of Cl-after 48h while the orange peel with particle size of 0.5mm and with only 2h of exposition decreased the initial concentration of Cr and Cl-in a 94% (21.1mg/L) and 59.76% (10100mg/L) respectively. Finally, the pectin at a contact time of 6h showed the highest absorption of Cr (98.23%-6.2 mg/L). Therefore, the three different tested products presented a very high efficiency in the reduction of ion concentration of Cr and Cl-and lead new and novel alternatives for the treatment of wastewater of the tannery industries.
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