Redução química e biológica do cromo hexavalente aplicado ao solo

Castilhos, Danilo Dufech; Vidor, Caio; Tedesco, Marino José

doi:10.1590/s0100-06832001000200026

Rev. Bras. Ciênc. Solo

2001

DOI: 10.1590/s0100-06832001000200026

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Redução química e biológica do cromo hexavalente aplicado ao solo

Danilo Dufech Castilhos

Caio Vidor

Marino José Tedesco

Abstract: RESUMORealizou-se um experimento em laboratório, com o objetivo de avaliar não só a redução do cromo hexavalente aplicado ao solo com ênfase ao efeito da aplicação de carbono orgânico, manganês divalente, mas também a participação da microbiota do solo. Utilizaram-se, como unidades experimentais, amostras de 50 g de um Argissolo, acondicionadas em sacos de polipropileno e incubadas durante 42 dias com calcário para elevar o pH a 6,0 (2,0 t ha

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Cited by 3 publications

References 13 publications

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Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Santos,

Lima,

Cardoso

et al. 2024

J Surfact & Detergents

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This research studied the wastewater chromium removal efficiency by dissolved air flotation (DAF) using a rhamnolipid (RL) biosurfactant as a collector. An experimental flotation DAF apparatus with 6 vessels of 2 L containing a coupled saturator injecting compressed air at 5.88 kPa in the vessels was used. The total RL concentration of the broth resulting from fermentation was 9 ± 1.0 g/L. This broth was used in nature in the DAF experiments. A central composite design (CCD) was used to optimize removal of Cr(VI) and total Cr with regards to two independent variables, pH (3.17–8.83) and iron concentration of the medium (0–225.0 mg/L), with a three assays performed at the conditions of the central point of the design. The experimental conditions for DAF were an initial hexavalent Cr concentration of 100 mg/L; RL broth volume of 500 mL; saturated with oxygen water volume of 200 mL; and a rapid mixing time of 6 min through stirring at 120 rpm. The results showed that under acidic pH conditions and with high iron concentrations, both the Cr(VI) and total Cr removal rates were highest. The optimal removal region determination was at a pH of 3.5 and iron concentration of 180 mg/L. Subsequently, cationic tannin‐based flocculant was also evaluated as a collector, and ferrous sulfate was used as a coagulant during Cr(III) removal. The best Cr(III) removal percentage was obtained at cationic polymer concentrations of 300 mg/L with Cr(III) removal of 50.8% and a pH of 5.5.

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Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Santos,

Lima,

Cardoso

et al. 2024

J Surfact & Detergents

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show abstract

Physiological analyses of Genipa americana L. reveals a tree with ability as phytostabilizer and rhizofilterer of chromium ions for phytoremediation of polluted watersheds

Santana

Almeida

Souza

et al. 2012

Environmental and Experimental Botany

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EFEITO DO LODO DE CURTUME NA FREQUÊNCIA DE MICRONÚCLEOS NO BIOINDICADOR Tradescantia pallida (Rose) D.R. Hunt var. purpurea

Gorni

Guandalini

Silveira

et al. 2014

Revista Brasileira De Engenharia De Biossistemas

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RESUMOO setor produtivo busca cada vez mais a utilização de subprodutos e resíduos industriais como alternativas econômica e ambiental para sustentabilidade produtiva. O lodo de curtume é o principal resíduo da indústria de couros sendo um dos mais polêmicos resíduos utilizados como fertilizante, por conter elementos que possivelmente possa vir a contaminar solo e subsolo. O objetivo deste trabalho foi analisar o potencial genotóxico de dois tipos de lodo de curtume (caleiro e primário da ETE) na microesporogênese de Tradescantia pallida var. purpurea, considerada indicador, utilizando o teste do micronúcleo (TRAD-MCN). As frequências de micronúcleos nos grupos controles e entre esses e o grupo tratado com o lodo de caleiro não diferiram. Já o grupo tratado com o lodo primário da ETE apresentou diferença significativa na frequência de micronúcleos (P<0,001) em relação aos demais grupos analisados, sugerindo efeito genotóxico de elementos químicos a serem detectados após análise físico-química dos dois tipos de lodos. Palavras-chave: Genotoxicidade ambiental. Micronúcleo (MCN).Tradescantia pallida var. purpúrea. EFFECT OF TANNERY SLUDGE IN MICRONUCLEUS FREQUENCY IN BIOINDICATOR Tradescantia pallida (Rose ) D.R. Hunt var. purpurea ABSTRACTThe productive sector increasingly search the use of by-products and industrial waste as an economic and environmental alternative to productive sustainability. The tannery sludge is the main waste of leather industry is one of the most controversial waste used as fertilizer because it contains elements that can possibly come to contaminate soil and sub-soil. The objective of this study was to analyze the genotoxic potential of two types of tannery sludge ( liming and primary ETE ) in Tradescantia pallida microesporogenese of var. purpurea , considered indicator, using the micronucleus test ( TRAD -MCN ) . The micronuclei frequencies in control groups and between these and the group treated with liming sludge did not differ. Already the group treated with the primary sludge from WWTP significant difference in the frequency of micronuclei ( P < 0.001 ) compared to the other groups analyzed, suggesting genotoxic effects of chemicals to be detected after physical -chemical analysis of two types of sludge .

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Redução química e biológica do cromo hexavalente aplicado ao solo

Cited by 3 publications

References 13 publications

Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Physiological analyses of Genipa americana L. reveals a tree with ability as phytostabilizer and rhizofilterer of chromium ions for phytoremediation of polluted watersheds

EFEITO DO LODO DE CURTUME NA FREQUÊNCIA DE MICRONÚCLEOS NO BIOINDICADOR Tradescantia pallida (Rose) D.R. Hunt var. purpurea

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