Presentation Title

A Comparison of Advanced Oxidation Effectiveness with Hydrogen Peroxide in Solar-UV and Solar-Simulated UV Systems

Faculty Mentor

Monica Palomo

Start Date

17-11-2018 3:00 PM

End Date

17-11-2018 5:00 PM

Location

CREVELING 106

Session

POSTER 3

Type of Presentation

Poster

Subject Area

interdisciplinary

Abstract

Hydrogen peroxide (H2O2) catalyzed by ultraviolet light (UV) radiation is an advanced oxidation process (AOPs) that degrades trace organic compounds present in wastewater. Treatments involved using different H2O2 concentrations in solar-simulated UV (lab scale) and solar-UV (outdoors) systems. Percent degradations of fluorescein and methylene blue were measured using absorbance of the samples to find compound concentration over time as the reaction progresses. The lab scale treatment involves a 120 watt solar-simulated UV lamp at 254 nm. In the solar UV treatment, solution mixtures were placed outdoors in sunlight during peak hours between 10am-2pm, around mid August. This study’s objective is to quantify the efficiency of H2O2/UV in degrading organic contaminants with fluorescein and methylene blue. In the lab scale treatments, concentration removal percentages for fluorescein was 45.1% and methylene blue was 44.2%. This AOP offers an eco-friendly and efficient alternative to degrading trace organic compounds in wastewater. Integrating AOPs in current wastewater methods may lead to more resource efficient treatments for higher water quality, subsequently improving ecosystem health.

Summary of research results to be presented

The percent degradations of both contaminants was analyzed in two different systems: solar UV and solar simulated UV treatments. The solar-simulated UV treatments for both compounds showed significant contaminant removal, whose percent degradation increased with higher H2O2 concentrations.

The solar UV treatments need to be redesigned for more reliable and comparable data to the solar-simulated UV treatments. More photochemically stable compounds should be used for outdoor treatments, as well as more accurate methods of concentration determination. Solar-UV treatment parameters were modified throughout experiments in efforts to troubleshoot the darkening effects of solutions, but it was likely that the instability of these compounds interfered with absorbance readings. Modifications included stabilizing temperature and Solar simulated-UV was likely to be most effective in degrading trace organics in wastewater due to its more controlled parameters. The pH was not altered and remaining around neutral throughout. Altering pH has been shown to drastically alter the rate of degradation of contaminant in other studies, with mildly acidic pH to be favorable for increased removal rate. Compounds that are more stable when treated with bright light may be better candidates for tracking degradation.

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Nov 17th, 3:00 PM Nov 17th, 5:00 PM

A Comparison of Advanced Oxidation Effectiveness with Hydrogen Peroxide in Solar-UV and Solar-Simulated UV Systems

CREVELING 106

Hydrogen peroxide (H2O2) catalyzed by ultraviolet light (UV) radiation is an advanced oxidation process (AOPs) that degrades trace organic compounds present in wastewater. Treatments involved using different H2O2 concentrations in solar-simulated UV (lab scale) and solar-UV (outdoors) systems. Percent degradations of fluorescein and methylene blue were measured using absorbance of the samples to find compound concentration over time as the reaction progresses. The lab scale treatment involves a 120 watt solar-simulated UV lamp at 254 nm. In the solar UV treatment, solution mixtures were placed outdoors in sunlight during peak hours between 10am-2pm, around mid August. This study’s objective is to quantify the efficiency of H2O2/UV in degrading organic contaminants with fluorescein and methylene blue. In the lab scale treatments, concentration removal percentages for fluorescein was 45.1% and methylene blue was 44.2%. This AOP offers an eco-friendly and efficient alternative to degrading trace organic compounds in wastewater. Integrating AOPs in current wastewater methods may lead to more resource efficient treatments for higher water quality, subsequently improving ecosystem health.