Abstract
The chloroform is a substance that presents a significant risk to or via the aquatic environment. Thus, the emissions, discharges and losses of this substance need to be controlled during wastewater disinfection for reclamation and reuse purposes. Due to its carcinogenetic potential, multiple studies have been carried out on drinking and surface/natural waters but less consideration has been directed to the wastewater disinfection. The focus of this work studied the formation of chloroform during chlorination in prepared waters or artificial matrices that intended to simulate wastewaters stored in landscape ponds for green areas irrigation. The relation between reaction time, chlorine dose, and chloroform formation and the variation of the dissolved organic carbon (DOC) content during the reaction was assessed. A two-variant model was proposed to simulate breakpoint chlorination practices (when chlorine dose is equal or lower than chlorine demand) and super chlorination techniques (when chlorine dose tends to surpass chlorine demand). The model was validated by the application of actual data from working conditions of six wastewater treatment plants located in Algarve, Portugal, including other data obtained in previous research studies that were not used in the model development, and by comparing the predicted values with real measured ones.
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The authors gratefully acknowledge the Portuguese Environment Agency and the FEDER, Programa Operacional Factores de Competitividade-COMPETE, and the project PEst-OE/CTM/UI0195/2011 - Fundação para a Ciência e Tecnologia (FCT), for their financial support.
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Rebelo, A., Ferra, I., Marques, A. et al. Wastewater reuse: modeling chloroform formation. Environ Sci Pollut Res 23, 24560–24566 (2016). https://doi.org/10.1007/s11356-016-7749-z
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DOI: https://doi.org/10.1007/s11356-016-7749-z