“…The reactivity of this system was first observed in 1894 by its inventor H. J. H. Fenton, but its utility was not recognized until the 1930s when a mechanism based on hydroxyl radicals was proposed [5]. The process may be applied to wastewaters, sludge, and contaminated soils to reduce toxicity, improve biodegradability, and remove odor and color [6][7][8]. During the Fenton process, hydrogen peroxide is catalyzed by ferrous ion to produce hydroxyl radicals [5].…”