Influence of contaminant to hydrogen peroxide to catalyzer molar ratio in the advanced oxidation of thiocyanates and ammonia nitrogen using Fenton-based processes

Active Treatment of Contaminants of Emerging Concern in Cold Mine Water Using Advanced Oxidation and Membrane-Related Processes: A Review

“…The Fenton-like process was found highly efficient (>99% of 1 g/L SCN − ) and a potential economical option for SCN − partial oxidation (at pH 2.5-3) into cyanides to be returned to the leaching of gold and silver from their ores [94]. Consistently, at 21 • C, Fenton-like gave 84% and 22% of SCN − and NH 3 -N removal (at initial concentrations of 1 g/L and 40 mg/L, respectively), whereas at 4 • C the efficiency of SCN − degradation decreased to 73% [95]. This AOP has major advantages, as the iron catalyst is easily available; the process is environmentally friendly and entails low residual toxicity and operating costs [101].…”

“…Some AOPs fit into these requirements as they are efficient at low temperatures and allow for the complete oxidation of several contaminants in water using environmentally friendly oxidants, based on the hydroxyl radical, such as peroxone (H 2 O 2 +O 3 ) [93], Fentonlike (H 2 O 2 and Fe 3+ catalyst) [94,95], ferrates (Fe(VI)) [96], and O 3 microbubbles [63,64,97] or persulfate-based AOPs [98]. The peroxone was found more effective in the degradation of naphthenic acids and toxicity reduction than ozonation (at high doses), a costly treatment for oil sands process-affected water [99].…”

Simultaneous removal of COD and Ammoniacal Nitrogen from dye intermediate manufacturing Industrial Wastewater using Fenton oxidation method

“…Industrial wastewater is generally characterized by extensive contamination with organic compounds, halogenated aliphatic and aromatic compounds, agrochemicals, high concentrations of heavy metals, sulphur and nitrogen-containing compounds, high COD, TDS and TSS (Bolong et al 2009;Dükkanci et al 2014;Gonzalez-Merchan et al 2016). The wastewaters from the dye intermediate industry are highly acidic and contain nitrogenous pollutants (various compounds of nitrate, nitrite and ammoniacal nitrogen), carbonaceous pollutants and other toxic compounds which are hazardous to the human health and to the aquatic environment (Bhatia et al 2018;Markandeya et al 2018;Kaur et al 2019).…”

“…Advanced oxidation processes (AOPs) drew the attention of researchers for its advantages as it works in ambient temperature and pressure, it has less reaction time and is more economical and feasible than conventional methods (Guedes et al 2003;Khatri et al 2018;Zhang and Zhou 2019). Fenton oxidative process is used for the oxidation of organic pollutants by using nascent hydroxyl ion resulted from the reaction of hydrogen peroxide by ferrous ion (Quan et al 2010;Gonzalez-Merchan et al 2016;Nidheesh 2015). The various advantages of Fenton reagent over other methods are given in Table 1.…”