Print Email Facebook Twitter Micropollutant biotransformation under different redox conditions in PhoRedox conventional activated sludge systems Title Micropollutant biotransformation under different redox conditions in PhoRedox conventional activated sludge systems Author Martins, Tiago A.E. (KWR Water Research Institute; Nova University of Lisbon) Muñoz Sierra, Julian (TU Delft Sanitary Engineering; KWR Water Research Institute) Nieuwlands, Jo A. (Water Authority Scheldestromen) Lousada Ferreira, M. (KWR Water Research Institute) Amaral, Leonor (Nova University of Lisbon) Date 2024 Abstract The ecotoxicological safety of the water bodies relies on the reduction of micropollutant emissions from wastewater treatment plants (WWTP). The ecotoxicological safety of the water bodies relies on the reduction of micropollutant emissions from wastewater treatment plants (WWTP). Quantification of micropollutant removal at full-scale WWTP is scarce. To our knowledge, the anaerobic conversion rates determined at conventional activated sludge processes are, so far, scarcely available in the literature for most of the micropollutants. In this research, we quantified the biotransformation rate constants and the removal efficiencies of 16 micropollutants (4,5-methylbenzotriazole, azithromycin, benzotriazole, candesartan, carbamazepine, clarithromycin, diclofenac, gabapentin, hydrochlorothiazide, irbesartan, metoprolol, propranolol, sotalol, sulfamethoxazole, trimethoprim, and venlafaxine), under aerobic, anoxic, and anaerobic redox conditions; using as inoculum wastewater and biomass from a full-scale conventional activated sludge (CAS) system in the Netherlands. Clarithromycin was the compound that exhibited the highest aerobic (76%) and anaerobic (78%) removal efficiencies, while gabapentin showed the highest removal under anoxic conditions (91%). A preference for cometabolic biotransformation of the targeted micropollutants was observed. The highest biotransformation rate constants obtained were: at aerobic conditions clarithromycin with 1.46 L.gSS−1.d−1; at anoxic conditions, gabapentin with 2.36 L.gSS−1.d−1; and at anaerobic redox conditions clarithromycin with 1.87 L.gSS−1.d−1. The obtained results of biotransformation rates will allow further modelling of micropollutant removal in CAS systems, under various redox conditions. These biotransformation rates can be added to extended ASM models to predict effluent concentration and optimize targeted advanced oxidation processes allowing savings in the operational costs and increasing the process viability. Subject Activated sludgeBiotransformation rateKineticsMicropollutantsRedox conditions To reference this document use: http://resolver.tudelft.nl/uuid:fdf3fd92-0e8e-49d5-8db6-cb8a51c8fe94 DOI https://doi.org/10.1016/j.eti.2024.103639 Source Environmental Technology and Innovation, 35 Part of collection Institutional Repository Document type journal article Rights © 2024 Tiago A.E. Martins, Julian Muñoz Sierra, Jo A. Nieuwlands, M. Lousada Ferreira, Leonor Amaral Files PDF 1-s2.0-S2352186424001159-main.pdf 1.03 MB Close viewer /islandora/object/uuid:fdf3fd92-0e8e-49d5-8db6-cb8a51c8fe94/datastream/OBJ/view