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      Tratamentos integrados em efluente metal-mecânico: precipitação química e biotratamento em reator do tipo air-lift Translated title: Integrated treatments for metalworking effluent: chemistry precipitation and biotreatment in air-lift reactor type

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          Abstract

          Os objetivos deste trabalho foram: realizar a caracterização físico-química de um efluente metal-mecânico e efetuar o tratamento integrado (precipitação química e biotratamento), utilizando micro-organismos autóctones do efluente (FI e FV) e uma referência (A. niger). A caracterização indicou pH de 1,7; cor de 1.495 mg Pt.L-1; demanda química de oxigênio de 9.147 mgO2.L-1; 887 mg.L-1 de óleo e graxa, além de 2,5 mgO2.L-1 de oxigênio dissolvido. Com o tratamento por precipitação química, obteve-se, em pH = 7,5, a redução de todos os íons metálicos investigados. Após o biotratamento, a cor foi reduzida em 95%, utilizando o micro-organismos FV. As reduções da demanda química de oxigênio e de óleo e graxa foram mais significativas utilizando FI, que reduziu os mesmos em 52 e 62%, respectivamente. Estes resultados indicaram que os micro-organismos autóctones do efluente foram mais eficazes no tratamento do mesmo do que o organismo de referência A. niger.

          Translated abstract

          The objectives of this paper were: to perform the physical-chemical characterization of a metalworking effluent and to carry out the integrated treatment (chemical precipitation and biotreatment), using effluent autochthonous microorganisms (FI and FV) and a reference (A. niger). The characterization indicated pH of 1.7; color, 1,495 mg Pt.L-1; chemical oxygen demand, 9,147 mgO2.L-1; oil and grease, 887 mg.L-1, and dissolved oxygen with 2.5 mgO2.L-1. With the chemical precipitation treatment, in pH = 7.5, the reduction of all the investigated metallic ions was obtained. The color was reduced 95% after the biotreatment using the FV microorganism. The chemical oxygen demand and oil and grease reductions were more significant when using FI, which reduced the same in 52 and 62%, respectively. These results indicated that the autochthonous microorganisms were more efficient in the effluent treatment than the reference organism A. niger.

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          Most cited references 56

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          Physico–chemical treatment techniques for wastewater laden with heavy metals

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            Standard Methods for Examination of Water and Waste Water

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              Standard methods for examination of water and wastewa-ter.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                esa
                Engenharia Sanitaria e Ambiental
                Eng. Sanit. Ambient.
                Associação Brasileira de Engenharia Sanitária e Ambiental - ABES (Rio de Janeiro )
                1809-4457
                June 2011
                : 16
                : 2
                : 181-188
                S1413-41522011000200012
                10.1590/S1413-41522011000200012

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: SciELO Brazil
                Categories
                WATER RESOURCES

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