A critical review on destruction of thiocyanate in mining effluents

Gould, W. Douglas; King, M.P.; Mohapatra, Bidyut R.; Cameron, Rory A.; Kapoor, Anoop; Koren, David W.

doi:10.1016/j.mineng.2012.04.009

Cited by 119 publications

(42 citation statements)

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“…Several chemical methods, such as electrochemical oxidation, hydrogen peroxide oxidation or ozonation have been proposed for thiocyanate removal and/or detoxification [2,10,28]. However, most of these chemical techniques are either too costly, ineffective or produce a toxic residue, for example, cyanide, and thus are not widely used [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of these chemical techniques are either too costly, ineffective or produce a toxic residue, for example, cyanide, and thus are not widely used [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, it has been reported that substrate inhibition begins to appear at thiocyanate concentrations higher than 20 ppm and complete inhibition occurs at concentrations higher than 1,000 ppm [14]. A number of chemolithotrophic and chemoheterotrophic bacteria isolated from a variety of sources can utilize thiocyanate as a source of energy and nutrients [6,10]. These include Paracoccus species which are able to oxidize not only thiocyanate, but also thiosulphate, tetrathionate, sulphide and elemental sulphur [9].…”

Section: Introductionmentioning

confidence: 99%

“…Arthrobacter utilizes thiocyanate as a nitrogen source, even in the presence of other nitrogen sources (ammonia or nitrate). Pseudomonas stutzeri uses thiocyanate as both a sulphur and nitrogen source in absence of ammonium ion [10]. Grigor'eva et al [11] used a co-culture of Pseudomonas putida and Pseudomonas stutzeri to degrade both cyanide and thiocyanate.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have proposed the following process for the utilization of thiocyanate by Thiobacillus thiocyanooxidans. First, thiocyanate is hydrolysed to cyanate (OCN -) and sulphide, followed by hydrolysis of cyanate to ammonia and bicarbonate, and oxidation of sulphide to sulphate [10,15]. In addition, Kim and Katayama [18] described the hydrolyzation of thiocyanate by T. thioparus THI115 to ammonia and carbonyl sulphide, which is subsequently oxidized to sulphate.…”

Section: Introductionmentioning

confidence: 99%

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Conditions and Mechanisms in Thiocyanate Biodegradation

Combarros¹,

Collado²,

Laca³

et al. 2015

JRST

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Presence of thiocyanate (SCN -) is a problem of considerable interest in many industrial wastewaters, where this contaminant often appears accompanied by secondary sources of carbon, nitrogen and/or sulphur. In order to understand the effect of these compounds on the biodegradability of SCN -, this work investigates how the bacterium Pararacoccus thiocyanatus utilises the three elements that form the molecule of thiocyanate and compare this behaviour with those obtained in presence of other sources of N, S and C. Result showed that the bacterium was capable of utilizing thiocyanate as the sole substrate, achieving specific biodegradation rates of approximate 1.20 mg SCN -(mg cell·h) -1 and eliminating initial thiocyanate concentrations up to 5,000 mg L -1 . Experimental data were successfully fitted to a Teisser model, assuming the existence of substrate inhibition obtaining values of μ max of 0.059 h -1 , K s of 790 mg L -1 and K i of 6,520 mg L -1 for free mineral medium. Presence of additional carbon and nitrogen sources implied catabolic repression of the biodegradation of thiocyanate. In this case, only concentrations lower than 3,500 mg L -1 could be treated, obtaining specific degradation rates of around 0.70 mg SCN -·(h·mg cell) -1 . Tessier model values showed a higher maximum specific growth rate (0.344 h -1 ), changing also the values for affinity and inhibition constants (1,150 mg L -1 and 1,730 mg L -1 , respectively).

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Section: Introductionmentioning

confidence: 99%

“…However, most of these chemical techniques are either too costly, ineffective or produce a toxic residue, for example, cyanide, and thus are not widely used [10].…”

Section: Introductionmentioning

confidence: 99%