TRATAMENTO DE ESGOTO SANITÁRIO UTILIZANDO COAGULANTE NATURAL SEGUIDO DE FILTRO ORGÂNICO

Abstract

The use of natural coagulants and organic filters locally produced and low financial cost can provide attenuation problems in discharge of wastew aters, without treatment, into watercourses. Was ev aluated in this study the efficiency of the coagulation pro cess, using the Ca(OH) 2 in the preparation of Moringa seed extract, followed by filtration sawdust in the trea tment of sewage. In the tank of 150 L containing se wage was added a solution of the moringa seed extract prepar ed with Ca(OH) 2 0.011 mol L -1 at a concentration of 2.2 grams of seed per liter of wastewater to be treated . The coagulated effluent was applied to organic fi lter and the filtrate volume was converted in pore volume. Physi cal and chemical analyses were carried out in the i nfluent and effluent of the two treatment structure for the evaluation of treatment efficiency. The treatments by coagu- lation followed by filtration provided removals of 98.0, 75.3, 75.8, 75.0, 79, 7, 59.0 and 88.3% of tu rbidity, Total Solids, Total Fixed Solids, Total Volatile So lids, Total Suspended Solids, Suspended Solids Fixe d and Volatile Suspended Solids and of 51.2, 88.7, 72.6; 33.5 and 38.5% of Biochemical Oxygen Demand, Chemic al Oxygen Demand, Phosphorus, Nitrogen and Sodium.