Microbial Chromium (VI) Reduction

Chen, Jin M.; Hao, Oliver J.

doi:10.1080/10643389891254214

Cited by 235 publications

(96 citation statements)

References 65 publications

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“…Chromium sulphate [Cr(III)] is used as a tanning agent, resulting in severe ground water contamination around tanneries, which is transformed to Cr(VI), which has been reported to pose health risk in humans, animals and plants [4]. Bioremediation of soluble Cr(VI) can be effectively done by microbes in which it is reduced to less toxic Cr(III) [5]. Several bacteria such as Pseudomonas ambigua [6], Bacillus sp.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Growth Characteristics of Chromium(VI) and Pentachlorophenol Tolerant Bacterial Isolate from Treated Tannery Effluent for its Possible Use in Simultaneous Bioremediation

et al. 2011

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The bacterial strains resistant to pentachlorophenol (PCP) and hexavalent chromium [Cr(VI)] were isolated from treated tannery effluent of a common effluent treatment plant. Most of the physico-chemical parameters analyzed were above permissible limits. Thirty-eight and four bacterial isolates, respectively were found resistant to [50 lg/ml concentration of [Cr(VI)] and the same level of PCP. Out of the above 42 isolates, only one was found simultaneously tolerant to higher levels of both PCP (500 lg/ml) and Cr(VI) (200 lg/ml), and hence was selected for further studies. To the best of our knowledge, this is the first report in which a native bacterial isolate simultaneously tolerant to such a high concentrations of Cr(VI) and PCP has been reported. The culture growth was best at 0.4% (w/v) glucose as an additional carbon source and 0.2% (w/v) ammonium chloride as a nitrogen source. The growth results with cow urine as a nitrogen source were comparable with the best nitrogen source ammonium chloride. The isolate exhibited resistance to multiple heavy metals (Pb, As, Hg, Zn, Co & Ni) and to antibiotics nalidixic acid and polymixin-B. The efficacy of bacterial isolate for growth, PCP degradation (56.5%) and Cr(VI) bioremediation (74.5%) was best at 48 h incubation. The isolate was identified as Bacillus sp. by morphological and biochemical tests. The 16S rDNA sequence analysis revealed 98% homology with Bacillus cereus. However, further molecular analysis is underway to ascertain its likelyhood of a novel species.

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Section: Introductionmentioning

confidence: 99%

Isolation and Growth Characteristics of Chromium(VI) and Pentachlorophenol Tolerant Bacterial Isolate from Treated Tannery Effluent for its Possible Use in Simultaneous Bioremediation

et al. 2011

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“…In contrast, Cr(III) is relatively non-toxic and immobile. Much research focused on the remediation of Cr(VI) such as adsorption by zeolites (Bowman, 2003) or silicas (Hideaki et al, 2002), chemical reduction by ferrous iron (Buerge and Hug, 1999;Fendorf and Li, 1996) or zero-valent iron (Powell and Puls, 1997;Alowitz and Scherer, 2002), bioremediation by strains of bacteria (Chen and Hao, 1998) etc.…”

Section: Introductionmentioning

confidence: 99%

Remediation of Cr(VI) in solution using vitamin C

Liu

2005

J Zheijang Univ Sci B

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Abstract:The effectiveness of vitamin C in treating Cr(VI)-contaminated water is being evaluated. Cr(VI) is an identified pollutant of some soils and groundwater. Vitamin C, an important biological reductant in humans and animals, can be used to transform Cr(VI) to essentially nontoxic Cr(III). The removal efficiency was 89% when the mass concentration of vitamin C was 80 mg/L in 60 min, and nearly 100% Cr(VI) was removed when the mass concentration was 100 mg/L. Our data demonstrated that the removal efficiency was affected by vitamin C concentration, the reaction temperature and the dissolved oxygen concentration. The reaction mechanism of Cr(VI) by vitamin C was presented. Our study opens the way to use vitamin C to remediate Cr(VI)-contaminated soils and groundwater.

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“…Metales como el plomo [1], cobre [2], cadmio [3,4], zinc [5], mercurio [6], níquel [7] y cromo [8] provenientes de diferentes actividades industriales como la minería, la industria de pinturas, la fabricación de baterías, los recubrimientos, las impresiones, la industria energética, los fertilizantes, los plaguicidas y los textiles tienen efectos negativos sobre la salud humana (anemia, anorexia, malestar, pérdida de apetito, daño cerebral, de híga-do, de riñón, daño gastrointestinal y retraso mental en los niños) y el ambiente. La mayoría de los iones metálicos son tóxicos para los seres vivos.…”

Section: Introductionunclassified

Remoción de cromo hexavalente de soluciones acuosas usando cáscara de yuca (Manihot esculenta): Experimentos en columna

2017

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ResumenIntroducción− El cromo hexavalente es un metal altamente tóxico y es considerado como uno de los contaminantes de mayor impacto ambiental. El uso de bioadsorbentes se ha considerado como una alternativa viable para su remoción, por lo que es necesario estudiar el comportamiento de estos adsorbentes en operaciones unitarias semejantes a las empleadas en la industria.Objetivo− Estudiar el potencial de la cáscara de yuca como biosorbente en la adsorción de cromo hexavalente en un proceso semicontinuo en columna de lecho empacado.Metodología− Se analizó la influencia del caudal de alimentación de soluciones de cromo, la concentración de dicho caudal y la altura del lecho sobre la capacidad de remoción y el tiempo de ruptura en un montaje a escala de laboratorio.Resultados− Hay un mayor rendimiento cuando se utilizan el flujo de alimentación y la concentración inicial más bajos, así como la mayor altura del lecho. El comportamiento dinámico fue ajustado a tres modelos clásicos de experimentos en columna. No obstante, el mejor ajuste se alcanzó con el modelo estadístico de superficie de respuesta.Conclusiones− La concentración inicial de cromo en la corriente de alimento es el factor que tiene mayor efecto sobre la capacidad de remoción y el tiempo de ruptura en columnas de lecho fijo empacadas con cáscara de yuca.Palabras clave− Cáscara de yuca, cromo, remoción, tiempo de ruptura, columna empacada Abstract Introduction− Hexavalent chromium is a highly toxic metal and it is considered one of the contaminants with the highest environmental impact. Bioadsorbents have been considered as a viable option for chromium removal, leading to the necessity to study the behavior of these adsorbents in unit operations similar to the ones employed in the industry.Objective− To study the potential of cassava peels as bio-sorbent in the adsorption of hexavalent chromium in a semi-continuous process in fixed bed columns.Methodology− The effect of parameters such as feed flow rate, initial concentration and bed column height on the response variables rupture time and removal capacity was analyzed using a laboratory scale experimental set-up.Results− Low feed flow rates, low initial concentrations, and higher bed height produce the best conditions for chromium removal. Additionally, three classical models for removal on packed column were used to fit the dynamic behavior of this process and to obtain significantly physical parameters. However, the best fitting was obtained using the model of the response surface.Conclusions− The concentration of chromium in the feed stream is the experimental factor that has the most influence on removal capacity and rupture time in fixed bed columns packed with cassava peel.

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Microbial Chromium (VI) Reduction

Cited by 235 publications

References 65 publications

Isolation and Growth Characteristics of Chromium(VI) and Pentachlorophenol Tolerant Bacterial Isolate from Treated Tannery Effluent for its Possible Use in Simultaneous Bioremediation

Isolation and Growth Characteristics of Chromium(VI) and Pentachlorophenol Tolerant Bacterial Isolate from Treated Tannery Effluent for its Possible Use in Simultaneous Bioremediation

Remediation of Cr(VI) in solution using vitamin C

Remoción de cromo hexavalente de soluciones acuosas usando cáscara de yuca (Manihot esculenta): Experimentos en columna

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