Conventional oxidation treatments for the removal of arsenic with chlorine dioxide, hypochlorite, potassium permanganate and monochloramine

A novel approach for arsenic adsorbents regeneration using MgO

“…In practice, when As(III) is present, a chemical or biological pre-oxidation step is embodied [28,29], followed by the removal of arsenic in the form of As(V). Therefore, the spent adsorbents of full scale treatment plants contain almost exclusively As(V), which in turn implies that the alkaline regeneration stream will contain only the leached As(V).…”

Groundwater arsenic removal by coagulation using ferric(III) sulfate and polyferric sulfate: A comparative and mechanistic study

“…The oxidation time of 20 min is sufficient for the As treatment process in the two-bucket system. A previous study using 3.0 mg/L NaClO (Sorlini and Gialdini, 2010) demonstrated that 1 min was adequate for 100% oxidation of 14.6 μg/L groundwater As(III), whereas, the longer time of 5 min was needed for 95% oxidation of 50 μg/L As(III). Thus, a higher concentration of As(III) should contribute to the slower oxidation of As(III) to As(V).…”

“…The appropriate dose of Ca(ClO) 2 was optimized by adding different doses into three groundwater samples (G5, G8, and G10) in the field. Samples were collected and filtered through a 0.22 μm membrane filter after 30 min, which is usually adequate for As(III) oxidation by Ca(ClO) 2 (Sorlini and Gialdini, 2010). Furthermore, the kinetics of As(III) oxidation was recorded for the optimized dose of Ca(ClO) 2 .…”

Fresh Water Savings Through the Use of Municipal Effluents in Concrete Pavement

“…Even though the oxidation potential of potassium permanganate is less than that of oxone, potassium permanganate is also a highly effective oxidant and literature shows that in addition to treatment of organic loading and pathogens, it is effective in oxidizing some heavy metals of concern in water and wastewater treatment such as arsenic, iron and manganese (Sorlini and Gialdini, 2010;Fan et al, 2013;Zhang et al, 2013). Furthermore, potassium permanganate has been widely used in water and wastewater treatment to control taste and odor, remove color, control biological growth in treatment plants, remove polycyclic aromatic hydrocarbons which have a carcinogenic and/or mutagenic potential (de Souza e Silva et al, 2009;Rodríguez et al, 2007); and potassium permanganate has several additional advantages such as easier to handle, readily soluble and higher efficiency in water and soil treatment over other oxidants (Xu et al, 2005;Yan and Schwartz, 1999).…”