The present study evaluates the removal capacity of sugarcane bagasse biochar for nitrate, nitrite, ammonium and phosphate present in sewage; likewise, the optimum dose (mg/ml) of biochar was determined for the synergic elimination of these contaminants within the matrix studied, for which 10 experimental treatments have been developed at biochar dose levels of 0,5; 1,0; 2,0; 3,0 and 4,0 mg/ml and contact times of 2h and 4h, which were performed in triplicate and the elimination percentages were presented through their mean and standard error. In addition to the evaluation of the individual effect of the biochar dose and the contact time, an adjustment of the bivariate effects was made through response superficies method and overlays of contour images, where it was determined that the maximum elimination zone was 95,7 %; 94,6 %; 72,0 % and 57,0 % for NH4 +, PO4 3- , NO2 - y NO3 -, respec...

The present study evaluated the performance of tannery effluent treatments by coagulation processes. This was done by combining each of the organic coagulants L-1544, L-1541, and L-1700 with aluminium sulphate, respectively, as an inorganic coagulant in different mixing ratios. Subsequently, the response surface method optimized the coagulation conditions: agitation speed, time, and total coagulant concentration. The best results were obtained with the cationic coagulant based on L-1544; likewise, by superposition of contours plots, the conditions that maximize the percentages of simultaneous removal of turbidity and suspended solids were determined, the optimum coagulation values being time 4 minutes, agitation speed 169.7 rpm and total coagulant concentration 1354 ppm, obtaining 100 and 61.9 % removal of turbidity and suspended solids respectively. The R-Squared statistics show that th...