Use of Fenton's Reagent as a Disinfectant

Abstract

Several compositions of Fenton's Reagent and hydrogen peroxide alone were used to disinfect combined sewage samples from a wastewater treatment facility. The presettled samples contained suspended solids (SS) and dissolved organic carbon (DOC) at concentrations of 28 and 290 mg/L, respectively. Disinfection with Fenton's Reagent was carried out at a pH between 5.90 and 6.0 and at a temperature of 25 • C. All disinfected samples contained residual oxidants. Under all reaction conditions studied, complete inactivation of E. coli was achieved within one minute of the addition of Fenton's Reagent. Disinfection with hydrogen peroxide alone under similar conditions is incomplete even under much longer contact times. O

Conventional and Alternative Disinfection Methods of Legionella in Water Distribution Systems – Review

“…In the absence of a light source, hydrogen peroxide will decompose by Fe 2+ ions that present in the aqueous phase, resulting in the formation of hydroxyl radicals [33], [40], [41]. Process of generation of hydroxyl radicals by Fenton's reaction is very sensitive to pH, the ratio of Fe 2+ to H 2 O 2 and the concentration of Fe 2+ [42], [43]. Fenton's reaction is effective for acidic conditions (optimum pH of 3 -4), and its efficiency may rapidly decrease at pH above 5 [20], [43], [44].…”

“…Another advantage over chlorine-based disinfectants is the prevention of bacteria regrowth potential without formation of deleterious disinfection by-products. Chemicals involved in the Fenton's process are easily handled, are not toxic or harmful to the environment, and are economically attractive [20], [41], [42], [43]. Another advantage of the Fenton's process is that no energy input is necessary to activate hydrogen peroxide, making the reaction possible at atmospheric pressure and at room temperature [43].…”

Disinfection of secondary treated wastewater using under pressure dissolved oxygen, copper ions and hydrogen peroxide

“…Conventional chemical disinfectants such as chlorine gas and hypochlorite have some advantages including rapid oxidation rates, low cost and high biocide potency. However, the mutagenic and carcinogenic by-products produced due to the application of these disinfectants have motivated scientists to seek alternative methods which may be more environmentally friendly (Liberti et al, 2000;Selvakumar et al, 2009).…”

“…However, to achieve a satisfactory level of STW disinfection, high concentrations of HP and a long detention time are required (Ragab-Depre, 1982;Selvakumar et al, 2009;Wagner et al, 2002). Wagner et al (2002) showed that to achieve a 5 log reduction of E. coli in STW, more than 700 mg L -1 of HP is required for 2 h. Velasquez et al (2008) reduced FC and pathogenic bacteria of advanced primary treatment effluent to acceptable levels according to international legislation, however, this required more than 250 mg L -1 of HP and contact times of over 2 h.…”

“…In the Fenton reaction, reduced metal ions react with HP and produce hydroxyl radicals (OH · ). Hydroxyl radicals are highly reactive and are responsible for biological damage to microbial cells (Cross et al, 2003;Ragab-Depre, 1982;Selvakumar et al, 2009;Shapiro et al, 2004). Further studies on this phenomenon showed that modification of the Fenton reagent by Cu 2+ , aqueous dissolved oxygen and ascorbic acid formulation have biocide potency and can destroy spores of Bacillus which are unaffected by environmental stresses such as heat radiation and toxic chemicals (Cross et al, 2003;Shapiro et al, 2004).…”