Removal of iron–cyanide complexes from wastewaters by combined UV–ozone and modified zeolite treatment

Hanela, Sergio; Durán, Jorge; Jacobo, Silvia E.

doi:10.1016/j.jece.2015.06.023

Cited by 33 publications

(14 citation statements)

References 16 publications

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“…According to the results it can be seen that the reactions of the mixture, Na2S2O5 + H2O2 with cyanide-containing complexes, sulfides, and metals; it had a delaying role in the destruction of CNL, within the limits of the study; this could corroborate the claim of [8] which indicates that, when it comes to sludge with an important presence of sulfides, the peroxide does not adapt well to the system. However, the study tried to elucidate the behavior of Na2S2O5 + H2O2 in degrading CNL contained in a tailings pulp.…”

Section: Type Of Reagentmentioning

confidence: 64%

“…The mining industry uses about 18% of the total CNproduction [1] [2] [3] [4] [5] [6]. There are different processes to treat the effluents contaminated with CN -, such as biodegradation, alkaline chlorination, INCO process (SO2/air) (International Nickel Company), hydrogen peroxide, Caro's acid method (H2SO4/H2O2), ozonization, reverse osmosis, activated carbon, resins, among others [3] [6] [7] [8] [9] [10].…”

Section: Introductionmentioning

confidence: 99%

“…For the leaching of gold-containing ores using CN -, this may exist in three forms: total cyanide (CNT), weak acid dissociable cyanide or WAD and CNL [3][4][5][6][7][8][9][10][11]…”

Section: Introductionmentioning

confidence: 99%

“…In a determined process and depending on the pH value of the aqueous medium with cyanide, the CNT level is always greater than or equal to the WAD CN and the level of the latter should be greater than or equal to the CNL level [1] [2]. According to [8], at an approximate pH of 9.4, the concentrations of CNand HCN are equal but at a pH of less than 8, almost all of the free cyanide is available as HCN and may volatilize; however, [1] indicates that at a pH of 10 or higher, most of the CNL is present as a CNion. For [3], when precipitating iron cyanides, relatively low levels of CNT at pH 7.0 are reached and for [13] and [14] the WAD CN are cyanide species released with a moderate pH of 4.5 and 6 as aqueous HCN and CNand the majority of the complexes of Cu, Cd, Ni, Zn, Ag.…”

Section: Introductionmentioning

confidence: 99%

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Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide

Llerena

López

2019

TECCIENCIA

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Cyanide ion (CN-) is widely used in different industrial operations, such as jewelry, steel manufacture, gold and silver extraction and electroplating. However, industrial emissions containing the CNion have to be treated to comply with environmental regulations. This research aimed to degrade free cyanide (CNL) present in the tailing of a metallurgical plant that processes gold-bearing ores and uses sodium cyanide (NaCN) as a leaching reagent. Sodium metabisulfite (Na2S2O5) and sodium metabisulfite with hydrogen peroxide (Na2S2O5 + H2O2) were used as oxidizing agents. To evaluate the effect of the factors, we used a factorial design with three independent variables: stirring time, reagent excess percentage, type of reagent and a dependent variable: CNL degradation (mg/L). According to the analysis of variance (ANOVA), the variables influenced significantly CNL degradation, being the most relevant the reagent excess percentage and according to the results, the maximum CNL degradation was 97.67% when 400% of Na2S2O5 was added with 4 hours of stirring.

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Section: Type Of Reagentmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

“…For the leaching of gold-containing ores using CN -, this may exist in three forms: total cyanide (CNT), weak acid dissociable cyanide or WAD and CNL [3][4][5][6][7][8][9][10][11]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide

Llerena

López

2019

TECCIENCIA

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“…To treat the cyanide contained industrial effluent generally chemical oxidation techniques has been used (Botz, 2001;Dash, Gaur, & Balomajumder, 2009;Parga, Shukla, & Carrillo-Pedroza, 2003). Some other treatment technologies have been also introduced to treat the cyanide-containing wastewaters (Abbas et al, 2014;Hanela, Durana, & Jacobob, 2015;Palmer, Breton, Nunno, & Sulivan, 1988). However, these methods are expensive and hazardous chemicals are used as the reagents processes involving sorption have received greater attention and most widely accepted method for toxic contaminated wastewater (Agarwal, Balomajumder, & Thakur, 2013;Singh, Agarwal, & Balomajumder, 2016).…”

Section: Introductionmentioning

confidence: 99%

Sorption of cyanide from aqueous medium by coffee husk: Response surface methodology

Gebresemati

Gabbiye

Sahu

2017

Journal of Applied Research and Technology

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Cyanide is a very toxic compound that is released into the environment through industrial effluents; therefore, it needs to be removed prior to wastewater discharge. Adsorption is one of the most widely used treatment methods for removing contaminants from water and wastewater. In present research work response surface methodology was successfully employed for optimization and analysis of the adsorption process. Batch mode experiments were performed to determine the adsorption equilibrium of cyanide in aqueous solution. At optimum condition initial concentration (10 mg/l), contact time (1 h), adsorbent dose (1 g) and pH (8), 90.6% of cyanide adsorption was obtained. The factorial design and RSM analysis demonstrated that the experimental and the predicted values from the models were in agreement.

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Monitoring WAD cyanide concentration in river waters with a glassy carbon electrode modified with 9,10‐Phenanthroquinone

Cardenas‐Riojas,

Calderon‐Zavaleta,

Quiroz‐Aguinaga

et al. 2023

Electroanalysis

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Heavy metal‐containing industrial effluent streams from electroplating and metalworking industries represent a major environmental issue. They contain metal cyanide complexes ([Ni(CN)4]2− and [Cu(CN)3]2−) referred to as weak acid dissociable cyanide (CN‐WAD), which require continuous in situ monitoring. In this scenario, a glassy carbon (GC) electrode superficially decorated with 9,10‐phenanthroquinone (FNQ) is manufactured and employed for the simultaneous electrochemical monitoring of cyanide WAD complexes. The interaction between GC and FNQ was characterized by Raman and electrochemical impedance spectroscopies, cyclic voltammetry, and chronocoulometry. The electrochemical evaluation was conducted by differential pulse voltammetry (DPV) and CV. The GC/FNQ electrochemical sensor simultaneously detected cyanide complexes with an average linear range of 9–93 μmol L−1, and a detection limit of 0.15±0.04 μmol L−1 and 1.2±0.6 μmol L−1 for [Ni(CN)4]2− and [Cu(CN)3]2−, respectively. The sensor demonstrated remarkable selectivity in the presence of multiple interfering species with a percentage variation range of 89.2–109.4 %. Moreover, a computational DFT study provided valuable insights into the electrode/electrolyte interface. Finally, the developed sensor was applied for the electrochemical detection of WAD cyanide in river water samples.

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Removal of iron–cyanide complexes from wastewaters by combined UV–ozone and modified zeolite treatment

Cited by 33 publications

References 16 publications

Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide

Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide

Sorption of cyanide from aqueous medium by coffee husk: Response surface methodology

Monitoring WAD cyanide concentration in river waters with a glassy carbon electrode modified with 9,10‐Phenanthroquinone

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