USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS

USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS

Residual solutions containing Cr(VI) ions can be harmful to the environment as well as to human health. Hence, practical and efficient methods for the treatment of such solutions are welcome. In this note, the treatment with commercial steel wool pads of a Cr(VI) residual solution from electrochemical coloration processes of stainless steel is described in detail. Successful treatment was achieved when an amount of steel wool equivalent to 20% in excess in relation to the theoretical stoichiometric amount was used, followed by chemical precipitation with sodium hydroxide up to pH 10-11 and separation by filtration under reduced pressure. The treatment yielded a final solution with concentrations of Cr(III) and Cr(VI) ions of only 0.29 ± 0.02 mg L-1 and < 0.01 mg L-1, respectively. These concentration values are significantly lower than the maximum limits established by CONAMA for industrial wastewaters, attesting the efficiency of the treatment.

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Main Authors: Irikura,Kallyni, Guerra,Marcelo Braga Bueno, Bocchi,Nerilso, Rocha-Filho,Romeu Cardozo, Kikuti,Elaine, Biaggio,Sonia Regina
Format: Digital revista
Language:Portuguese
Published: Sociedade Brasileira de Química 2018
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000300340
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spelling oai:scielo:S0100-404220180003003402018-04-23USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEISIrikura,KallyniGuerra,Marcelo Braga BuenoBocchi,NerilsoRocha-Filho,Romeu CardozoKikuti,ElaineBiaggio,Sonia Regina removal of Cr(VI) ions reduction precipitation wastewater treatment Residual solutions containing Cr(VI) ions can be harmful to the environment as well as to human health. Hence, practical and efficient methods for the treatment of such solutions are welcome. In this note, the treatment with commercial steel wool pads of a Cr(VI) residual solution from electrochemical coloration processes of stainless steel is described in detail. Successful treatment was achieved when an amount of steel wool equivalent to 20% in excess in relation to the theoretical stoichiometric amount was used, followed by chemical precipitation with sodium hydroxide up to pH 10-11 and separation by filtration under reduced pressure. The treatment yielded a final solution with concentrations of Cr(III) and Cr(VI) ions of only 0.29 ± 0.02 mg L-1 and < 0.01 mg L-1, respectively. These concentration values are significantly lower than the maximum limits established by CONAMA for industrial wastewaters, attesting the efficiency of the treatment.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaQuímica Nova v.41 n.3 20182018-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000300340pt10.21577/0100-4042.20170150
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language Portuguese
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author Irikura,Kallyni
Guerra,Marcelo Braga Bueno
Bocchi,Nerilso
Rocha-Filho,Romeu Cardozo
Kikuti,Elaine
Biaggio,Sonia Regina
spellingShingle Irikura,Kallyni
Guerra,Marcelo Braga Bueno
Bocchi,Nerilso
Rocha-Filho,Romeu Cardozo
Kikuti,Elaine
Biaggio,Sonia Regina
USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
author_facet Irikura,Kallyni
Guerra,Marcelo Braga Bueno
Bocchi,Nerilso
Rocha-Filho,Romeu Cardozo
Kikuti,Elaine
Biaggio,Sonia Regina
author_sort Irikura,Kallyni
title USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
title_short USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
title_full USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
title_fullStr USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
title_full_unstemmed USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
title_sort uso de palha de aço comercial para o tratamento de efluentes contendo cromo hexavalente provenientes de processos de eletrocoloração de aços inoxidáveis
description Residual solutions containing Cr(VI) ions can be harmful to the environment as well as to human health. Hence, practical and efficient methods for the treatment of such solutions are welcome. In this note, the treatment with commercial steel wool pads of a Cr(VI) residual solution from electrochemical coloration processes of stainless steel is described in detail. Successful treatment was achieved when an amount of steel wool equivalent to 20% in excess in relation to the theoretical stoichiometric amount was used, followed by chemical precipitation with sodium hydroxide up to pH 10-11 and separation by filtration under reduced pressure. The treatment yielded a final solution with concentrations of Cr(III) and Cr(VI) ions of only 0.29 ± 0.02 mg L-1 and < 0.01 mg L-1, respectively. These concentration values are significantly lower than the maximum limits established by CONAMA for industrial wastewaters, attesting the efficiency of the treatment.
publisher Sociedade Brasileira de Química
publishDate 2018
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000300340
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