Metales pesados y calidad agronómica del agua residual tratada

Abstract

In this study, water samples were collectedfrom the effluent of a treatment plant wastewater during the months of January to July 2012. The objective was to determine the concentration ofheavy metals, as well as evaluating the agricultural quality of the treated wastewater. The results of analysis of elements: cadmium (Cd), copper (Cu), chromium (Cr), nickel (Ni), lead (Pb) and zinc (Zn), show that the concentration of these metals was low, so which, according to NOM-001-SEMARNAT-1996 the treated wastewater complies with the permitted concentrationfor download on receiving bodies. Using variables: Ca2+, Mg2+, Na+, K+, CO32-, HCO3-, Cl-, SO42-, pH, electrical conductivity (EC) and sodium adsorption ratio (SAR) was determined agricultural quality. The salinity indicators show that water is not suitable for irrigation. The SAR values were lower than 5.5 meq L-1, the joint EC-SAR values show that water use is restricted by salinity risk when applied to irrigation.