Cyanide oxidation by ozone in cyanidation tailings: Reaction kinetics

Pedroza, Francisco Raúl Carrillo; Nava‐Alonso, F.; Uribe‐Salas, A.

doi:10.1016/s0892-6875(00)00034-0

Cited by 36 publications

(18 citation statements)

References 7 publications

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“…The most common methods are chemical oxidation, including chlorination [22][23][24], the INCO process using sulfur dioxide and oxygen [25,26], the Degussa process using hydrogen peroxide [27,28] and ozonation [29,30].…”

Section: Introductionmentioning

confidence: 99%

Aqueous phase catalytic oxidation of cyanides over iron-modified cobalt oxide system

Stoyanova

Christoskova

Georgieva

2004

Applied Catalysis A: General

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Section: Introductionmentioning

confidence: 99%

Aqueous phase catalytic oxidation of cyanides over iron-modified cobalt oxide system

Stoyanova

Christoskova

Georgieva

2004

Applied Catalysis A: General

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“…The occurrence of cyanide compounds in industrial wastewater, however, presents a major environmental and ecological hazard. Chemical treatment of various cyanide species is a well-established technology for which several commercial processes are available (Carrillo-Pedroza et al 2000). The biological degradation of cyanide compounds has also been extensively demonstrated (Knowles and Bunch 1986;Dorr and Knowles 1989;Meyers et al 1991;Watanabe et al 1998;Dhilon and Shirvaraman 1999).…”

Section: Introductionmentioning

confidence: 99%

Empirical model for the autotrophic biodegradation of thiocyanate in an activated sludge reactor

Plessis

Barnard

Muhlbauer

et al. 2001

Lett Appl Microbiol

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Aims: The aim of this investigation was to develop an empirical model for the autotrophic biodegradation of thiocyanate using an activated sludge reactor. Methods and Results: The methods used for this purpose included the use of a laboratory scale activated sludge reactor unit using thiocyante feed concentrations from 200 to 550 mg l )1 . Reactor ef¯uent concentrations of <1 mg l )1 thiocyanate were consistently achieved for the entire duration of the investigation at a hydraulic retention time of 8 h, solids (biomass) retention of 18 h and biomass (dry weight) concentrations ranging from 2 to 4 g l )1 . A biomass speci®c degradation rate factor was used to relate thiocyanate degradation in the reactor to the prevailing biomass and thiocyanate feed concentrations. A maximum biomass speci®c degradation rate of 16 mg )1 g )1 h )1 (mg thiocyanate consumed per gram biomass per hour) was achieved at a thiocyanate feed concentration of 550 mg l )1 . The overall yield coef®cient was found to be 0á086 (biomass dry weight produced per mass of thiocyanate consumed). Conclusions: Using the results generated by this investigation, an empirical model was developed, based on thiocyanate feed concentration and reactor biomass concentration, to calculate the required absolute hydraulic retention time at which a single-stage continuously stirred tank activated sludge reactor could be operated in order to achieve an ef¯uent concentration of <1 mg l )1 . The use of an empirical model rather than a mechanistic-based kinetic model was proposed due to the low prevailing thiocyanate concentrations in the reactor. Signi®cance and Impact of the Study: These results represent the ®rst empirical model, based on a comprehensive data set, that could be used for the design of thiocyanate-degrading activated sludge systems.

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“…Ozone is a superior oxidant to oxygen and has been extensively studied in the oxidation of cyanide [48][49][50][51]. Two oxidation mechanisms of cyanide to cyanate by ozone have been proposed, namely simple (Eq.…”

Section: Ozonationmentioning

confidence: 99%

Review of the Impact on Water Quality and Treatment Options of Cyanide Used in Gold Ore Processing

Nyamunda¹

2017

Water Quality

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Cyanide has been widely used in several industrial applications such as electroplating photography, metal processing, agriculture, food and the production of organic chemicals, plastics, paints and insecticides. The strong affinity of cyanide for metals such as gold and silver makes it suitable for selective leaching of these metals from ores. Cyanide is highly toxic; hence, there is a need to regulate and limit the amount of cyanide that may be discharged into the environment. Technologies focusing on the use of physical, chemical and biological methods have been developed to reduce the concentration of cyanide and cyanide compounds in wastewaters to permissible limits. This chapter reviews the current and emerging technologies for treatment of cyanide from wastewaters generated in gold mining processes.

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Cyanide oxidation by ozone in cyanidation tailings: Reaction kinetics

Cited by 36 publications

References 7 publications

Aqueous phase catalytic oxidation of cyanides over iron-modified cobalt oxide system

Aqueous phase catalytic oxidation of cyanides over iron-modified cobalt oxide system

Empirical model for the autotrophic biodegradation of thiocyanate in an activated sludge reactor

Review of the Impact on Water Quality and Treatment Options of Cyanide Used in Gold Ore Processing

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