title: Understanding the removal mechanisms of PPCPs and the influence of main technological parameters in anaerobic UASB and aerobic CAS reactors.
abstract: The removal of 16 Pharmaceutical and Personal Care Products (PPCPs) were studied in a conventional activated sludge (CAS) unit and an upflow anaerobic sludge blanket (UASB) reactor. Special attention was paid to each biomass conformation and activity as well as to operational conditions. Biodegradation was the main PPCP removal mechanism, being higher removals achieved under aerobic conditions, except in the case of sulfamethoxazole and trimetrophim. Under anaerobic conditions, PPCP biodegradation was correlated with the methanogenic rate, while in the aerobic reactor a relationship with nitrification was found. Sorption onto sludge was influenced by biomass conformation, being only significant for musk fragrances in the UASB reactor, in which an increase of the upward velocity and hydraulic retention time improved this removal. Additionally, PPCP sorption increased with time in the UASB reactor, due to the granular biomass structure which suggests the existence of intra-molecular diffusion.
authors.affiliation: Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Electronic address: teresa.alvarino@usc.es.
authors.forename: T
authors.initials: T
authors.lastname: Alvarino
authors.affiliation: Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Electronic address: Sonia.suarez@usc.es.
authors.forename: S
authors.initials: S
authors.lastname: Suarez
authors.affiliation: Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Electronic address: juan.lema@usc.es.
authors.forename: J M
authors.initials: JM
authors.lastname: Lema
authors.affiliation: Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Electronic address: francisco.omil@usc.es.
authors.forename: F
authors.initials: F
authors.lastname: Omil
mesh_terms: D000327:Adsorption; D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000737:chemistry / Q000145:classification / Q000302:isolation & purification; D019149:Bioreactors / Q000382:microbiology; D003358:Cosmetics / Q000737:chemistry / Q000378:metabolism*; D017404:In Situ Hybridization, Fluorescence; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000378:metabolism*; D012722:Sewage; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
chemical_list: D003358:Cosmetics; D004364:Pharmaceutical Preparations; D012722:Sewage; D014874:Water Pollutants, Chemical
keywords: Anaerobic/aerobic; Biodegradation; Pharmaceutical and Personal Care Products (PPCPs); Removal mechanisms; Sorption