Os benefícios da utiliza o de coagulantes naturais para a obten o de água potável = The benefits of using natural coagulants to obtain potable water

Este trabalho tem como objetivo a avalia o dos benefícios da obten o de água potável a partir de coagulantes naturais, em fun o da remo o dos parametros cor, turbidez e compostos com absor o em UV-254 nm, utilizando como agente coagulante o Tanfloc SS. Com esta finalidade, ensaios de coagula o/flocula o/sedimenta o foram realizados em aparelho “jar test”, com água superficial de características de alta cor/turbidez. O pH de coagula o (3,0 a 9,0) e a concentra o do coagulante (10,0 a 60,0 mg L-1) foram variadoscom a finalidade da constru o dos diagramas de coagula o e a determina o das regi es de melhor eficiência de remo o de cor e turbidez. As condi es de trabalho para o processo de coagula o/flocula o/sedimenta o foram fixadas de acordo com ensaios prévios. Com os dados obtidos, o diagrama de coagula o foi construído utilizando o programa 3DField 2.7.0.0. Com base nestes diagramas, para o coagulante Tanfloc SS, concluiu-se que as melhores remo es dos parametros estudados, em sua maioria, ocorreram para a faixa de pH entre 6,0 e 9,0 em todas as concentra es estudadas. Desta forma, constatou-se que a utiliza o de coagulantes organicos biodegradáveis é, portanto, uma alternativa técnica aos coagulantes convencionais, possuindo benefícios de saúde pública além de preserva o ambiental. This work aims to evaluate the benefits of obtaining potable water from natural coagulants, in function of the removal of the parameters color, turbidity and compounds with absorbing in UV-254 nm, using Tanfloc SS as a coagulant. To that end, coagulation/flocculation/sedimentation tests were performed in jar test with surface waterfeaturing high color/turbidity. The coagulation pH (3.0 to 9.0) and the concentration of coagulant (10.0 to 60.0 mg L-1) were varied with the purpose of constructing coagulation diagrams and determine regions of best efficiency for removal of color and turbidity. Theworking conditions for the process of coagulation/flocculation/sedimentation were set according to preliminary tests. With the data obtained, the coagulation diagram was built using the 3DField 2.7.0.0 software. Based on these diagrams, for the coagulant Tanfloc SS, it is concluded that the best removals of the parameters studied, in their majority, occurred in the range of pH between 6.0 and 9.0 in all the concentrations studied. Thus, it was noted that the use of biodegradable organic coagulant is therefore a technical alternative to conventional coagulants, with public health benefits in addition to environmental preservation.