Removal of H2S and COD Using UV, Ferrate and UV/Ferrate from Municipal Wastewater

Abstract

Journal homepage: www.zums.ac.ir/jhehp Background: The aim of this study is to compare UV, ferrate (VI) and UV/ferrate (VI) methods for removal of hydrogen sulfide and chemical oxygen demand (COD) from municipal wastewater under a continuous condition. Methods: The experiment was divided into three parts: 1) pollutants removal by using ferrate (VI) alone; 2) pollutants removal using UV alone; 3) pollutants removal using a combination of UV/ferrate (VI). The electrolysis process was utilized to generate ferrate (VI). Results: The results showed that UV had the highest pollutants removal, so that 89% and 85% of hydrogen sulfide and COD were removed from the wastewater, respectively. UV/ferrate (VI) ranked as the next most efficient method. This method removed 65% and 73% of hydrogen sulfide and COD, respectively from the wastewater. Conclusion: Using ferrate (VI) alone had the lowest pollutant removal efficiency, with 41% and 48% of hydrogen sulfide and COD removal from wastewater, respectively. UV has a higher ability to remove hydrogen sulfide and COD from wastewater, compared with UV/ferrate (VI) and ferrate (VI) alone.

Comparing the ZnO/Fe(VI), UV/ZnO and UV/Fe(VI) processes for removal of Reactive Blue 203 from aqueous solution

“…The increase of Fe(VI) concentration up to 3.3 mg/L had a positive effect on the dye removal ( Figure 3d). Similar results about the effect of temperature on pollutants removal using Fe(VI) have been reported (2,32,39,41).…”

“…Apparently, further studies are recommended to identify the reasons for such a behavior in the removal of dye using the combination of UV radiation and Fe(VI) oxidation process. Talaiekhozani et al reported that 65% and 73% of hydrogen sulfide and chemical oxygen demand (COD) were removed, respectively, when the combination of UV radiation and Fe(VI) was used (39). It seems that this method is more effective in the removal of dye compared with that of hydrogen sulfide and COD.…”

“…These interactions are more intense at a wavelength about 0.3 µm. Although many studies have already been done on the removal of pollutants using UV radiation, Fe(VI) oxidation process, and ZnO nanoparticles (34)(35)(36)(37)(38)(39), but no study has investigated the effect of combination of these methods to remove dye from wastewater. In this study, the effects of Fe(VI) oxidation process, ZnO nanoparticles, and UV radiation and their combination on the removal of Reactive-Blue 203 dye were investigated.…”

Comparison of Azithromycin Removal from Water Using UV Radiation, Fe (VI) Oxidation Process and ZnO Nanoparticles

“…UV radiation is also an effective parameter in the removal of organic compounds such as antibiotics from water [50]. The results showed that increasing UV radiation resulted in an increase in the removal efficiency of antibiotic from the ASCA (Figure 5d).…”

“…The concentration of Fe(VI) is also another important parameters in the removal of antibiotics from synthetic wastewater [50]. Increasing the concentration of Fe (VI) from 1 to 4 mg/L increased the antibiotic removal efficiency.…”