Removal of cyanide from steel plant effluent using coke breeze, a waste product of steel industry

Preventing of flooding phenomena on vacuum distillation trays column via controlling coking value factor

“…In general, the feed quality received from battery 1 was always higher than that of battery 3 of steel plant. The difference in feed quality depends on to the heating conditions of coal and the condensation of vapors of CT [17][18][19]. The type of coal used in the steel plant was constant during this period.…”

“…There are several properties of crude CT including density and water percentage, that should be considered for the use of CT as a raw material in industry as well as the distillation process. Those mentioned properties are characterized and monitored by the quality control lab of the steel plant at the beginning and before storage in supply tanks [17][18][19] of which, some significant properties and their acceptable ranges of the crude CT are reported in Table 1 and compared with the National Iranian Oil Company standards for the crude oil feed [20].…”

A catalytic ozonation process using MgO/persulfate for degradation of cyanide in industrial wastewater: mechanistic interpretation, kinetics and by-products

“…10 Hydroxyl and sulfate radicals (HOc and SO 4 c À ) have almost similar redox potential (HOc: E 0 ¼ 2.74 V and SO 4 c À : E 0 ¼ 2.5-3.1 V) leading fragmentation of pollutants and mineralization to CO 2 and H 2 O. However, in comparison to HOc, SO 4 c À has some advantages including broad operational pH range (2)(3)(4)(5)(6)(7)(8) and longer half-life (30-40 ms) which provides better contact chance with contaminants. SO 4 c À can be generated through the activation of PS via various methods including heat, catalyst, electrochemical, UV, etc.…”

A Fuzzy MADM Approach for Selecting the Best Cyanide Removal Method from a Gold Mine Wastewater

“…It is accepted that cyanide, in some forms (hydrogen cyanide, sodium cyanide, and potassium cyanide), is a very powerful and fast acting toxin (Dash et al, 2009;Kuyucak and Akcil, 2013;Chu et al, 2020;Cope, 2020). The permissible limit for cyanide is less than 0.2 mg L -1 for surface discharge (Dzombak et al, 2005;Mondal et al, 2019;Madmon et al, 2021;Das et al, 2021). It is noticeable that under certain alkaline conditions, cyanide may persist for at least a century in groundwater, mine tailings, and abandoned leach heaps (Ware, 2004;Eisler, 2007).…”

“…The various physical and chemical techniques have been proposed for removing the cyanide from wastewater. The most important methods are: acidification processes, ion exchange, ozonation, electrolytic oxidation, electro-coagulation, chemical oxidation, natural decomposition, evaporation, oxidation with hydrogen peroxide, ferrous sulfide adsorption, sulfur dioxide oxidation, adsorption by activated carbon, electrolysis, pressure oxidation, ultraviolet ray, plasma discharge technology, biological decomposition, chlorination and complex formation (Kuyucak and Akcil, 2013;Mondal et al, 2019;Aliprandini et al, 2020;Chen et al, 2020;Bahrami et al, 2020;Eskandari et al, 2020;Lintzos et al, 2020;Mamelkina et al, Potivichayanon et al, 2020;Yang et al, 2020;Zhang et al, 2020;Chen et al, 2021;Das et al, 2021;Dong et al, 2021;Satizabal-Gomez et al, 2021;Pan et al, 2022). Generally, the cyanide removal methods include the oxidation of CNion and its conversion to cyanate (CNO -) ion.…”