Enhanced carbon adsorption treatment for removing cyanide from coking plant effluent

Cyanide removal with a copper/active carbon fiber Cathode via a combined oxidation of a Fenton-like reaction and in situ generated copper oxides at anode

“…Many strategies have been developed to remove cyanides from wastewater including activated carbon adsorption [3,4], coagulation [5] or ion-exchange [6]. These processes can generate highly concentrated products containing toxic cyanides, which need to be further treated.…”

“…With respect to the cyanide oxidation, iron cyanide complexes generated, which were known to be refractory and difficult to be furthermore treated. In the case of copper cyanide complexes, it was found that H 2 O 2 can oxidize Cu(CN) 3 2À to Cu(CN) 2…”

The treatment of cyanide from gold mine effluent by a novel five-compartment electrodialysis

“…Recently, other treatments including direct electrowinning, active carbon adsorption, ion exchange resins, solvent extraction and polychelating polymers have been proposed [2,20,21]. However, some of these processes have been hindered due to either low efficiencies or technical obstacles, while others are also energy and/or reagent intensive, or require special equipment and maintenance.…”

Treatment of cyanide bearing effluents by adsorption, biodegradation and combined processes: effect of process parameters

“…Cyanide is commonly found as a contaminant in wastewaters from various industries including metal cleaning, plating, electroplating, metal processing, automobile parts manufacture, steel tempering, mining, photography, pharmaceuticals, coal coking, ore leaching, plastics, etc. [3][4][5][6][7]. Cyanides are produced as wastes and emissions from these industries, along with ammonia, phenolic compounds, suspended particles, organic wastes and significant amount of heavy metals like copper, nickel, zinc, silver, gold, iron, etc.…”

“…Cyanide and its related compounds such as ammonia, cyanate, nitrate and thiocyanate can be treated and removed by one of several processes such as alkaline breakpoint chlorination, INCO process (by SO 2 /air), copper-catalyzed hydrogen peroxide, Caro's acid, natural attenuation, cyanide recovery, ozonation, electrolytic oxidation, ion exchange, acidification, AVR process, lime-sulfur, reverse osmosis, activated carbon adsorption, thermal hydrolysis and biological treatments etc. [3,6,[10][11][12][13].…”