RESUMOO tratamento convencional de água para consumo humano é realizado com a utilização de polímeros químicos, que causam impactos ambientais. Com isso, os polímeros naturais estão sendo pesquisados, como auxiliares na floculação ou mesmo como coagulantes principais, devido a sua biodegradabilidade. Desta forma, o objetivo deste trabalho foi verificar a influência da concentração e do tempo de sedimentação no uso do quiabo como auxiliar de floculação em conjunto com o coagulante químico Policloreto de Alumínio (PAC). Para isso, determinou-se primeiramente o pH ideal da água. Posteriormente, a fim de avaliar a influência do quiabo para o tratamento, realizaram-se testes apenas com PAC, variando a sua concentração (0-10 ppm) e com a combinação de coagulante (2 ppm) e quiabo, variando de 0,5 a 3 ppm. Os parâmetros analisados foram cor, turbidez, COD e UV-254 nm, medidos após diferentes tempos de sedimentação. Foi verificado que a concentração ótima de PAC foi de 6 ppm, que removeu 89, 82% da cor e 94,24% da turbidez. Já no ensaio do conjunto PAC/quiabo a concentração ótima de quiabo foi de 0,5 ppm, que removeu 82,51% de cor e 87,82% de turbidez. Não foi verificada necessidade de tempos de sedimentação maiores que cinco minutos. Mesmo não superando o tratamento com 6ppm de PAC, comparando com o ensaio com 2 ppm de PAC sem a adição do auxiliar, notou-se a relevância do quiabo para o tratamento, já que o primeiro apresentou somente 76,7 e 81, 76% de remoção de cor e turbidez, respectivamente. PALAVRAS-CHAVE: floculação, polímero natural, quiabo. INFLUENCE OF CONCENTRATION AND SEDIMENTATION TIME IN THE USE OF Abelmoschus esculentus (L.) MOENCH (OKRA) AS FLOCCULATION AUXILIARYABSTRACT The conventional treatment of drinking water is carried out with the use of chemical polymers, which cause environmental impacts. Thus, natural polymers are being investigated as flocculation auxiliaries or even as major coagulants because of their biodegradability. Thus, the objective of this work was to verify the influence of concentration and sedimentation time on the use of okra as a flocculation auxiliary of the chemical coagulant Poly Aluminum Chloride (PAC). For this, the water ideal pH was first determined. Subsequently, in order to evaluate the influence of okra on the treatment, tests were performed with PAC only, varying its concentration (0-10 ppm) and with the combination of coagulant (2 ppm) and okra, ranging from 0.5 at 3 ppm. The analyzed parameters were color, turbidity, COD and UV-254 nm, measured after different sedimentation times. It was found that the optimum PAC concentration was 6 ppm, which removed 89, 82% of the color and 94.24% of the turbidity. In the PAC / okra test, the optimum okra concentration was 0.5 ppm, which removed 82.51% of color and 87.82% of turbidity. There was no need for sedimentation times greater than 5 minutes. Although not exceeding the 6ppm PAC treatment, comparing with the 2 ppm PAC test without the addition of the auxiliary, the relevance of the okra was noted for the treatment, since the...
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