Evaluation of natural extracts coagulants of Moringa oleifera and Jatropha curcas in coffee wastewater. Evaluación de coagulantes de extractos naturales de Moringa oleifera y Jatropha curcas en las aguas residuales del café.

The evaluation of the coagulant effect of the Moringa oleifera and Jatropha curcas extracts on coffee wastewater was made in coffee wastewater at original pH after a primary treatment and adding, at the same time, calcium hydroxide and natural extract to the coffee wastewater. For the treatments evaluated with residual water at a COD concentration of 12,500 ppm (minimum value of concentration from the ecological process of the berries in fermentation tanks), there were no statistical differences in COD removal for T6: Extract of J. curcas + Ca (OH)2 (3,000 ppm), T5: Extract of J. curcas (1,500 ppm) + Ca (OH)2 (2,600 ppm), T4: Extract of J. Curcas (1,500  ppm).  However,  these  three  treatments  were  statistically  different  from  T1:  Control  treatment  with  aluminum sulphate and T2: M. oleifera extract (4,000 ppm) + Ca (OH)2 (2.600 ppm), although there were no statistical differences in COD removals between these two last treatments. For the treatments evaluated using wastewater at a COD concentration of 25.000 ppm there were no statistical differences in the removal of COD for T1: Control treatment with aluminum sulfate, and T3: M. oleifera extract (5,000 ppm). For all treatments evaluated, removals above 60% in COD were obtained.