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Zongsu Wei: Sulfate Radical‒Based Advanced Oxidation Technologies (AOTs) for Organic Pollutants Removal in Water

Seminar: WATEC - Aarhus University Centre for Water Technology

12.11.2018 | Sissel Rønning

Dato man 19 nov
Tid 10:30 12:30
Sted Aarhus University, Gustav Wieds Vej, building 3141-1.08

Speaker: Dr. Zongsu Wei , Department of Civil Engineering, Auburn University.

Abstract

Wastewater treatment is a multi‒billion dollar industry — there are 15,000 wastewater treatment plants (WWTPs) in the US alone, processing 100 billion liters of wastewater per day. Yet, despite their environmental and economic importance, conventional treatment technologies in WWTPs have failed to remove many trace level contaminants like pharmaceuticals and personal care products. Thus, WWTP effluent containing those contaminants releases to the environment, posing great concern to humans and the ecosystem. To this end, I investigated the radical‒based advanced oxidation technologies (AOTs) as an effective means to remove the contaminants of concern following primary and secondary treatments in the WWTPs.

In this seminar, I will discuss the oxidation process of representative organic pollutants by both hydroxyl radical (•OH) and sulfate radical anion (SO•4−)‒based AOTs, the degradation mechanisms toward the optimization, and the rational designs of more sustainable AOTs. First, innovative approaches will be discussed to improve radical oxidation processes, such as an up‒scale design of ultrasonic device and combination of ultrasound with a strong oxidant, persulfate. The following discussion will include quantum chemistry calculations as an emerging tool to provide physicochemical insights into the degradation process of organic pollutants by •OH/SO4−.

Finally, innovative designs will be discussed to extend the application of radical‒based AOTs in a more sustainable manner, including the photocatalyst‒activated carbon composite materials and the self‒cleaning hybrid membrane. Taken together, integration of these results provides a framework to enable development of next‒generation technologies for water treatments.

Mikrobiologi, Offentligheden / Pressen, Medarbejdere, Institut for Bioscience