Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon

The addition of powdered activated carbon (PAC) has been proposed as a suitable technique to protect activated sludge against toxic wastewaters. However, the literature data describing the combined effect of PAC addition on Cr(VI) removal using activated sludge are scarce. The objectives of this stu...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Ferro Orozco, Ana Micaela, Contreras, Edgardo Martín, Bértola, Nora Cristina, Zaritzky, Noemí Elisabet
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Química
Activated sludge
Powdered activated carbon
Hexavalent chromium
Trivalent chromium
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/101032
https://ri.conicet.gov.ar/11336/76071
https://www.ajol.info/index.php/wsa/article/view/49077
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-101032
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Activated sludge
Powdered activated carbon
Hexavalent chromium
Trivalent chromium
spellingShingle Química
Activated sludge
Powdered activated carbon
Hexavalent chromium
Trivalent chromium
Ferro Orozco, Ana Micaela
Contreras, Edgardo Martín
Bértola, Nora Cristina
Zaritzky, Noemí Elisabet
Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
topic_facet Química
Activated sludge
Powdered activated carbon
Hexavalent chromium
Trivalent chromium
description The addition of powdered activated carbon (PAC) has been proposed as a suitable technique to protect activated sludge against toxic wastewaters. However, the literature data describing the combined effect of PAC addition on Cr(VI) removal using activated sludge are scarce. The objectives of this study were to investigate the effect of the initial Cr(VI) concentration, PAC and an electron donor addition on Cr(VI) removal using aerobic activated sludge batch reactors. The following Cr(VI) removal systems were tested: activated sludge alone; activated sludge with an external electron donor (5 g/ℓ of lactose); activated sludge with PAC addition (4 g/ℓ); activated sludge with both PAC and lactose; and PAC alone. The results reported here showed that activated sludges are capable of removing Cr(VI) via its reduction to Cr(III) only if a suitable electron donor (such as lactose) is available. For initial Cr(VI) concentration lower than 10 mg/ℓ, biomass alone can remove 100% of the Cr(VI). However, for higher initial Cr(VI) concentrations, removal efficiencies (RE) of the system with PAC were higher than RE corresponding to the system without PAC. In addition, as the initial Cr(VI) concentration increased, the rate of Cr(VI) removal and RE values decreased reflecting loss of metabolic activity of the activated sludge due to the toxicity of Cr(VI); however, this inhibition was less in systems with PAC. Whereas the removal of Cr(VI) using powdered activated carbon (PAC) alone is negligible, the addition of PAC can improve the biological reduction of Cr(VI) due to the stimulating or protective effect against the Cr(VI) toxicity. This protective effect was also observed in respiratory activity of the biomass.
format Articulo
Articulo
author Ferro Orozco, Ana Micaela
Contreras, Edgardo Martín
Bértola, Nora Cristina
Zaritzky, Noemí Elisabet
author_facet Ferro Orozco, Ana Micaela
Contreras, Edgardo Martín
Bértola, Nora Cristina
Zaritzky, Noemí Elisabet
author_sort Ferro Orozco, Ana Micaela
title Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
title_short Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
title_full Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
title_fullStr Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
title_full_unstemmed Hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
title_sort hexavalent chromium removal using aerobic activated sludge batch systems added with powdered activated carbon
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/101032
https://ri.conicet.gov.ar/11336/76071
https://www.ajol.info/index.php/wsa/article/view/49077
work_keys_str_mv AT ferroorozcoanamicaela hexavalentchromiumremovalusingaerobicactivatedsludgebatchsystemsaddedwithpowderedactivatedcarbon
AT contrerasedgardomartin hexavalentchromiumremovalusingaerobicactivatedsludgebatchsystemsaddedwithpowderedactivatedcarbon
AT bertolanoracristina hexavalentchromiumremovalusingaerobicactivatedsludgebatchsystemsaddedwithpowderedactivatedcarbon
AT zaritzkynoemielisabet hexavalentchromiumremovalusingaerobicactivatedsludgebatchsystemsaddedwithpowderedactivatedcarbon
bdutipo_str Repositorios
_version_ 1764820440489918465

Ejemplares similares