The highly reducing hydrated electron, generated through ultraviolet advanced reduction processes (UV-ARP), can destroy recalcitrant chemical contaminants in water such as per- and polyfluoroalkyl substances within hours. Treatment effectiveness, however, is highly dependent on the hydrated electron formation and scavenging conditions which vary between individual studies and can change with time. This paper presentation explores a novel approach to evaluate micro-contaminant destruction and hydrated electron scavenging using the Re-,UV method. Deploying chloroacetate as a probe compound, the Re-,UV method is used to quantify the hydrated electron exposure for a UV/sulfite low pressure batch reactor and measure the scavenging capacity in four different source waters. The Re-,UV method is then used to model the destruction of perfluorooctane sulfonate (PFOS) and nitrate in each source water. The Re-,UV method proves to be a powerful tool in the evaluation of UV-ARP treatment effectiveness, offering a simple approach to optimize treatment conditions required to efficiently destroy micro-contaminants.

Concomitant evaluation of UV-ARP micro-contaminant destruction and hydrated electron scavenging by the Re-,UV method

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.