A trickling filter application for the treatment of a gold milling effluent

Evangelho, Mauro Rocha; Gonçalves, Maria Alice Rezende; Sant’Anna, Geraldo L.; Bôas, Roberto Cerrini Villas

doi:10.1016/s0301-7516(00)00059-4

Cited by 21 publications

(9 citation statements)

References 9 publications

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“…The biological treatment of cyanide wastes with fixed film processes has been demonstrated using both trickling filters and rotating biological contactors. A trickling filter operating without recirculation was capable of removing over 90% of the cyanide, thiocyanate, Ni, Fe and Cu from a gold mill effluent (Evangelho et al 2001). Rotating biological contactor reactors have also been successfully applied for laboratory based studies on the remediation of silver complexed cyanides derived from electroplating wastewaters (Patil and Paknikar 2000).…”

Section: Microbial Treatment Of Metal Cyanide Wastesmentioning

confidence: 99%

The current and future applications of microorganism in the bioremediation of cyanide contamination

Baxter

Cummings

2006

Antonie Van Leeuwenhoek

113

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Inorganic cyanide and nitrile compounds are distributed widely in the environment, chiefly as a result of anthropogenic activity but also through cyanide synthesis by a range of organisms including higher plants, fungi and bacteria. The major source of cyanide in soil and water is through the discharge of effluents containing a variety of inorganic cyanide and nitriles. Here the fate of cyanide compounds in soil and water is reviewed, identifying those factors that affect their persistence and which determine whether they are amenable to biological degradation. The exploitation of cyanides by a variety of taxa, as a mechanism to avoid predation or to inhibit competitors has led to the evolution in many organisms of enzymes that catalyse degradation of a range of cyanide compounds. Microorganisms expressing pathways involved in cyanide degradation are briefly reviewed and the current applications of bacteria and fungi in the biodegradation of cyanide contamination in the field are discussed. Finally, recent advances that offer an insight into the potential of microbial systems for the bioremediation of cyanide compounds under a range of environmental conditions are identified, and the future potential of these technologies for the treatment of cyanide pollution is discussed.

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Section: Microbial Treatment Of Metal Cyanide Wastesmentioning

confidence: 99%

The current and future applications of microorganism in the bioremediation of cyanide contamination

Baxter

Cummings

2006

Antonie Van Leeuwenhoek

113

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“…Concerning biological processes, many researchers reported in the past the application of different microorganisms for the removal of cyanide from wastewaters (specially, from gold mining) (Evangelho et al 2001, Akcil and Mudder 2003, Ebel et al 2007, Mekuto et al 2015, Mekuto et al 2016. Although biological systems have interesting advantages, as described by Akcil (2003), there are also limitations related to operational conditions.…”

Section: Introductionmentioning

confidence: 99%

Combined Treatment Using Ozone for Cyanide Removal From Wastewater: A Comparison

Esparza

Cueva

Sandoval‐Pauker

et al. 2019

Rev. Int. Contam. Ambie.

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Cyanidation is widely used by several gold mining companies worldwide. Since its wastewaters contain cyanide, appropriate treatments must be applied to remove this pollutant. Combinations of ozone (O3), hydrogen peroxide (H2O2) and activated carbon (AC) can be used for this purpose. In this work, synthetic cyanide solutions ([CN¯]o = 15.37 mM) were treated using O3 and the combinations O3/H2O2, O3/AC and O3/H2O2/AC under alkaline conditions. O3 was produced from dry oxygen at a rate of 2.51 g O3/h ([O3] gas-phase = 6.9x10-2 g/L). The concentration of cyanide (CN¯) and O3 consumption were measured and the performance of the treatments evaluated. The highest cyanide removal was reached at pH 11.0 for all cases and with 10 mg H2O2/ mg O3 upon adding H2O2. In contrast, the addition of AC did not improve the cyanide removal in comparison with O3 alone. The best cyanide removal was achieved with the combination O3/H2O2 followed by the combination O3/H2O2/AC. Moreover, cyanidation effluents were treated using the combination O3/H2O2. In this case, almost a total removal of free cyanide was achieved after 3 min of treatment. Palabras clave: ozonificación, peróxido de hidrógeno, sistema peroxona, carbón activado, cianuración RESUMEN El proceso de cianuración es ampliamente utilizado en la industria minera alrededor del mundo. Las aguas residuales de este proceso contienen cianuro, lo cual obliga al uso de tratamientos apropiados para su remoción. Para ello, se pueden utilizar combinaciones de ozono (O3), peróxido de hidrógeno (H2O2) y carbón activado (CA). En este trabajo se trataron, soluciones sintéticas de cianuro ([CN¯]o = 15.37 mM) con el uso de O3 y las combinaciones O3/H2O2, O3/CA y O3/H2O2/CA en condiciones alcalinas. Se produjo O3 a partir de oxígeno seco con una producción de 2.51 g O3/h ([O3] fase gaseosa = 6.9x10-2 g/L). Se evaluó el comportamiento de cada proceso y se midió la concentración de cianuro (CN¯) y el consumo de ozono durante los tratamientos. La mayor remoción de cianuro se alcanzó a pH 11.0 para todos los casos. Al añadir H2O2 la remoción fue mayor al usar 10 mg H2O2/mg O3. Por otra parte, la adición de CA no

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“…Wastewater containing thiocyanates is a threat to good water quality [2]. Therefore, the thiocyanates must be neutralized or removed from the wastewater prior to their release into the environment [3].…”

Section: Introductionmentioning

confidence: 99%

Thiocyanate removal from aqueous solution by a synthetic hydrotalcite sol

et al. 2011

Journal of Colloid and Interface Science

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A trickling filter application for the treatment of a gold milling effluent

Cited by 21 publications

References 9 publications

The current and future applications of microorganism in the bioremediation of cyanide contamination

The current and future applications of microorganism in the bioremediation of cyanide contamination

Combined Treatment Using Ozone for Cyanide Removal From Wastewater: A Comparison

Thiocyanate removal from aqueous solution by a synthetic hydrotalcite sol

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