Spatiotemporal dynamics of dissolved organic matter and disinfection by-products formation potential of Shengzhong Lake in southwest China

Abstract

The quality and quantity of dissolved organic matter (DOM) in lakes as well as its environmental effects associated with the unintended disinfection byproducts (DBPs) have received continuous attention. This work investigated the spatio-temporal dynamics of DOM in Shengzhong Lake in southwest China and the formed DBPs during the chlorine disinfection process. The results showed that lake water in summer had signi cantly higher dissolved oxygen and dissolved organic carbon than that in winter. In contrast, DOM in winter demonstrated an obviously higher aromaticity and molecular weight than that in summer. Four uorescence components, i.e., terrestrial humic-like substances (C1), protein-like substances (C2) and microbial humic-like substances (C3 and C4), were identi ed, and their relative abundance followed in the order of C3 > C4 > C2 > C1 in winter and C4 > C3 > C1 > C2 in summer. The formation potential of trihalomethanes and haloacetic acids in winter were higher and lower than that in summer, which were mainly ascribed to the content of aromatic and hydrophobic substances. Compared to the signi cant seasonal dynamic, the spatial variation of DOM and the formed DBPs was not obvious. This work sheds light on the spatial-temporal distribution of DOM and the potentially formed DBPs in Shengzhong Lake, and will be helpful for the protection and management of drinking water.

Characterization and spatiotemporal variations of fluorescent dissolved organic matter in leachate from old landfill-derived incineration residues and incombustible waste

“…By contrast, the DOM in the leachate of landfills containing only incineration residues and incombustible waste remains poorly understood. Most investigations on spatiotemporal variations of FDOM have mainly focused on rivers [22][23][24] and lakes [25,26] rather than landfill leachate. Moreover, reports on DOM in landfills have focused mainly on improving leachate treatment [14,27].…”