Ferrate(VI): A Green Molecule in Odorous Gas Treatment

Abstract

The odorous gaseous emissions from industrial and wastewater treatment plant processes pose risk for natural ecosystem and human health. This chapter presents an assessment of the potential of ferrate(VI) (Fe VI O 4 2-, Fe(VI)) to remove gaseous odor.Organosulfur compounds are usually predominate constituents of the odor and the kinetics, stoichiometry, and products of their oxidation by Fe(VI) is summarized. The second-order rate constants, k, of the oxidation reactions under alkaline conditions were in the range of~10 1 -10 5 M -1 s -1 . At a 10 mg L -1 K 2 FeO 4 dose, half-lives of the oxidation reaction would be in seconds or less at pH 9.0. The stoichiometry of the reactions of Fe(VI) with sulfur compounds generally varied from 1:2 to 2:3 and Fe(II) and Fe(III) were the reduced products of Fe(VI). Oxygen-containing products of the sulfur compounds were formed. Examples of case studies showed the efficient removal of odorous gases by Fe(VI).

Oxidation of Gabapentin by Potassium Ferrate (VI) in Alkaline Media-Kinetics and Mechanism Study

“…It has been used as a multipurpose wastewater chemical for oxidation, coagulation, deodorization and disinfection [1][2][3]. For instance, it could oxidize sulfur-containing compounds [4] which effectively reducing odor problems. It was used for sludge [5] treatment to effectively improve the quality of sludge.…”

Ferrate(VI) Oxidation Mechanism of Substituted Anilines: A Density Functional Theory Investigation

“…Unlike ozone, Fe­(VI) does not react with bromide ions and is not easy to form carcinogenic bromate ions . In the oxidation process, Fe­(VI) is reduced to nontoxic iron trioxide and iron hydroxide, and these two compounds are effective coagulants for removing toxic metals and organics . Meanwhile, Fe­(VI) has an efficient disinfection effect, which can quickly inactivate Escherichia coli .…”