Details

Autor(en) / Beteiligte

• An, Yali
• Ma, Xiaoyan Y.
• Chen, Wenfeng
• Li, Wei
• Yang, Siyan
• Chen, Rong
• Wang, Xiaochang C.

Titel

The impact of inorganic ions on the solar photolysis of chlorinated dissolved organic matter from different sources: Spectral characteristics, disinfection byproducts, and biotoxicities

Ist Teil von

• Journal of hazardous materials, 2023-06, Vol.451, p.131135-131135, Article 131135

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Dissolved organic matter (DOM) from wastewater treatment plant (WWTP) effluent is chlorinated and then discharged into natural waters, where it is subject to solar irradiation. However, the impacts of inorganic ions in natural waters on the photochemical transformations of the chlorinated DOM (DOM-Cl) have not been studied comprehensively. In this study, variations in the spectral characteristics, disinfection byproducts (DBPs), and biotoxicities of DOM-Cl under solar irradiation at different pH values and in the presence of NO3- and HCO3- were revealed. Three sources of DOM, including DOM from a WWTP effluent, natural organic matter from the Suwannee River, and DOM from plant leaf leachate, were investigated. Solar irradiation resulted in the oxidation of the highly reactive aromatic structures and then reduced the amounts of chromophoric and fluorescent DOM, especially under alkaline conditions. Moreover, alkaline conditions significantly promoted the detected DBPs degradation and the biotoxicities attenuation, while NO3- and HCO3- generally impeded them (or did not work). Dehalogenation of the unknown halogenated DBPs and photolysis of the nonhalogenated organics were the main mechanisms for the DOM-Cl biotoxicity reductions. Hence, improving the ecological safety of WWTP effluents could be achieved through solar irradiation by removing the DBPs formed. [Display omitted] •Solar irradiation decreased the CDOM and FDOM, especially at alkaline conditions.•Five detected DBPs were decreased by solar irradiation, while TCM increased.•Solar irradiation reduced the LB toxicity and genotoxicity from DOM-Cl.•Alkaline conditions reduced the DBPs and promoted two biotoxicities reduction.•NO3- and HCO3- inhibited DBPs degradation and two biotoxicities attenuation.