A UVA light-emitting diode microreactor for the photocatalytic degradation of humic acids and the control of disinfection by-products formation potential

• DOI: 10.1016/j.jclepro.2023.139395
• Publication Date: 2023-10-17T19:48:48Z
• Authors: Bo Liu; Baiyu Zhang; Guihua Dong; Fei Wu; Bing Chen
• Keywords: Microreactor; Degradation; Advanced oxidation process

Chlorination is one of the most applied technologies for drinking water disinfection. However, generation disinfection by-products (DBPs) in chlorination process a major concern terms safety, especially when levels natural organic matter (NOM) are high source water. Climate change increases fluctuation NOM water, which further challenges safety small and rural communities. In this study, environmental microfluidics was introduced to UVA-LED photocatalytic oxidation system rapid NOM. The results showed that 56.9% HA 58.1% dissolved carbon (DOC) were removed at pH 5 3.4 min by microreactor. adsorption degradation, DOC degradation more favored low pH. DBP formation efficiently reduced, with highest reduction THM HAA potentials 76% 70.7%, respectively. Compared bottle reactor, microreactor increased rate constants 2.99–15.8 times, 6.8–170.2 times mineralization. homogenous irradiation fast mass transfer accelerated inhibited acidic base solutions apparent quantum yields photocatalysis. Further, microfluidic much efficient inhibition DPBs sample. had chemical energy consumption. Approaches on scale-up, simplification, conservation would increase potential purification households