Eficiência da Moringa oleifera como coagulante natural em solução salina para água de abastecimento

Abstract

Several natural coagulants are being studied in the treatment of potable water. One is the coagulant is the base of Moringa oleifera seeds. Some researchers have found the protein present in the seed responsible for accelerating the coagulation process and in saline solution it even increases its efficiency. Therefore, this study aims to evaluate the saline solution as a means potentiating the action of the coagulant Moringa oleifera seed for water treatment for supplies. In order to compare the efficiency of seed application in saline solution was determined for the following treatments: C1: 2.0 g Moringa oleifera and 2.0 g NaCl; C2: Moringa oleifera 2.0 g and 1.8 g NaCl; C3: Moringa oleifera and 2.0 g NaCl 1.6 g; C4: Moringa oleifera and 2.0 g NaCl 1.4 g; C5: Moringa oleifera and 2.0 g NaCl 1.2 g; C6: 2.0 g Moringa oleifera without NaCl. Assays were performed in Jar Test to simulate the process of coagulation/flocculation/sedimentation. The parameters analyzed were pH, temperature, turbidity, apparent color, conductivity, COD and series of solids. It was observed that for pH values did not obtain significant variations compared to the gross amount varying in a range from 6.22 to 5.77 lasting the sedimentation process. Saline increased electrical conductivity values, but remained with few variations during the sedimentation process. The C2 treatment possessed the greatest color removal, turbidity and COD, with 91.5%, 91% and 38.9%, respectively, and present significant removal of total solids (65%). Statistical analyzes showed that, overall, there was no significant difference between the analyzed parameters between treatments with the addition of NaCl, differing significantly without NaCl treatment. Given the results proves, therefore the efficiency of the use of NaCl as a means potentiating the action of this natural coagulant.