首页|Trihalomethanes (thms) formation in chlorine-treated and -untreated wastewater and its horizontal and vertical distribution through the irrigation of agricultural fields

Trihalomethanes (thms) formation in chlorine-treated and -untreated wastewater and its horizontal and vertical distribution through the irrigation of agricultural fields

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This study examines the formation of trihalomethanes (THMs) in wastewater intended for crop irrigation and its relationship with dissolved organic carbon (DOC), aromaticity, and residual chlorine. The research takes a dual approach: assessing spatial distribution through field samples from canals now distributing treated, chlorinated wastewater and analysing vertical percolation of wastewater through soil previously irrigated with untreated, non-chlorinated wastewater for over 100 years. Spatial analysis reveals that THMs are present in wastewater before treatment, with concentrations increasing post-treatment. Although DOC levels decrease after treatment, their aromaticity remains unchanged, suggesting the persistence of labile DOC. The presence of THMs in treated wastewater from irrigation canals may result from shorter travel distances or increased chlorine use during the COVID-19 pandemic. Vertical soil column experiments indicate a correlation between THM generation, water source, and soil type. Results show that THMs are retained in the soil, where labile DOC is trapped, reducing its concentration while potentially releasing DOC from humic substances. Despite this, THM concentrations do not pose a risk to aquifers, though ongoing monitoring is important should soil and/or treatment methods be altered.

dissolved organic carbonirrigationleachingMezquital valleytrihalomethaneswastewater reuse

Alma L. Aguilar-Santos、Christina Siebe、Ruth Fuentes-Garcia、Blanca Prado-Pano、Jorge Meza-Gonzalez、Manuel Hernandez-Quiroz、Claudia Ponce de Leon

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Posgrado en Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, Ciudad Universitaria, C.P. 04510, Ciudad de Mexico, Mexico

Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, Ciudad Universitaria Coyoacan, C.P. 04510, Ciudad de Mexico, Mexico

Area de Matematicas, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, Ciudad Universitaria, C.P. 04510, Ciudad de Mexico, Mexico

Area de Biologia, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, Ciudad Universitaria Coyoacan, C.P. 04510, Ciudad de Mexico, Mexico

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2024

10.2166/WS.2024.239

Water science & technology: Water supply

Water science & technology: Water supply

EI
ISSN：1606-9749
年,卷(期)：2024.24(11/12)