Fate of glyphosate and its metabolite AminoMethylPhosponic acid (AMPA) from point source through wastewater sludge and advanced treatment

• Published in: Chemosphere (Oxford) 2023-11, Vol.340, p.139843-139843, Article 139843
• Main Authors: Venditti, Silvia, Kiesch, Anne, Hansen, Joachim
• Format: Article
• Language: English
• Subjects: alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; AminoMethylPhosponic acid (AMPA); Anaerobic digestion; Constructed wetlands; Glyphosate; Reject water; Sewage; Wastewater; Water
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2023.139843

The fate of glyphosate and its metabolite AminoMethylPhosponic acid (AMPA) was followed at the catchment of the Sûre river, mainly characterized by small population density and small and medium-sized wastewater treatment plants (WWTPs). A high concentration of AMPA was found in water samples collected in inlet from different wastewater streams, the industry being the main contributor, while glyphosate resulted mainly in domestic origin. The two molecules were also monitored in the anaerobic digestion as in the supernatant produced after centrifugation (reject water). A total of 0.0713 and 2.24 g/d of glyphosate and AMPA respectively were regularly returned to the activated sludge tank (AST) indicating a 20% impact of the sludge management line on the global wastewater mass balance. Finally, the use of Constructed Wetlands (CWs) in Vertical Flow (VF) configuration was tested as a suitable technology to retain both glyphosate and AMPA (90 and up to 50% elimination respectively) and minimize their discharge into surface water. [Display omitted] •Non-agricultural application of glyphosate is relevant for urban emission.•The origin of AMPA is mostly related to industry rather than glyphosate.•Concentrations of AMPA and glyphosate are relevant in reject water.•Vertical Flow Constructed Wetland is 90% efficient towards glyphosate.•AMPA degradation in the soil is sensitive to the wetland loading regime.