Suchergebnisse

Through their release of effluents, conventional wastewater treatment plants (WWTPs) represent a major pollution point sources for pharmaceutically active compounds (PhACs) in water bodies. The combination of a biological activated carbon (BAC) filter coupled with an ultrafiltration (UF) unit was evaluated as an advanced treatment for PhACs removal at pilot scale. The BAC-UF pilot plant was monitored for one year. The biological activity of the biofilm that developed on the granular activated carbon (GAC) particles and the contribution of this biofilm to the overall removal of PhACs were evaluated. Two different phases were observed during the long-term monitoring of PhACs removal. During the first 9200 bed volumes (BV; i.e., before GAC saturation), 89, 78, 83 and 79% of beta-blockers, psychiatric drugs, antibiotics and a mix of other therapeutic groups were removed, respectively. The second phase was characterized by deterioration of the overall performances during the period between 9200 and 13,800 BV. To quantify the respective contribution of adsorption and biodegradation, a lab-scale setup was operated for four months and highlighted the essential role played by GAC in biofiltration units. Physical adsorption was indeed the main removal mechanism. Nevertheless, a significant contribution due to biological activity was detected for some PhACs. The biofilm contributed to the removal of 22, 25, 30, 32 and 35% of ciprofloxacin, bezafibrate, ofloxacin, azithromycin and sulfamethoxazole, respectively ; This work has been supported by the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 642904 - TreatRec ITN-EID project

Comunicació de congrés presentada a: 16 th International Conference on Environmental Science and Technology, celebrat a l'Illa de Rodes (Grecia), del 4 a 7 de setembre de 2019 ; This work aims at integrating the last advances in high resolution mass spectrometry (HRMS) and statistical analysis of data to develop and optimize a smart methodology (workflow) for the assessment of the performance of innovative water treatments using different technological approaches based on advanced oxidation processes with UV-254nm: (i) UV/K2S2O8, where oxidation takes place mainly following the initial formation of sulfate radicals, (ii) UV/KHSO5, where oxidation begins with the formation of both sulfate and hydroxyl radicals and (iii) UV/H2O2, when only the formation of hydroxyl radicals takes place initially. Experiments were carried out using secondary effluent from a local wastewater treatment plant. The developed workflow allows the evaluation of the treatments in terms of overall oxidation through the careful study of Van Krevelen diagrams, where all the masses of the HRMS chromatograms are considered. The potential formation of transformation products with sulfur due to the sulfate radicals was also evaluated using statistical tools based on the isotopic pattern and accurate mass. Finally, the behavior of a large number of micropollutants with a wide range of physicochemical properties was studied using suspect screening strategies ; This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement SMARTWORKFLOW (747698), the Spanish Ministry of Science and Innovation (grant number CTQ2015-69832-C4), and the Economy and Knowledge Department of the Catalan Government (Consolidated Research Group program: ICRATECH - 2017 SGR 1318 and ICRA-ENV - 2017 SGR 01124)

The performance of an innovative, decentralized, nature-based wastewater treatment system composed of modular units (vermifilters and zooplankton-based reactors) on a pilot scale level (10 p.e.) is presented here. The efficiency of this system was evaluated over a 10-months period under controlled conditions at different flow-rates (750, 1,500 and 3,000 L·d-1). Vermifiltration alone delivered average removals of 88 ± 7%, 89 ± 8%, 91 ± 8% and 85 ± 19% for COD, TSS, NH4+ and BOD5, respectively. Zooplanktonbased reactor provided an important polishing stage that allowed the achievement of removal efficiencies above 95% for TSS, NH4+ and 91% for COD and BOD5, respectively. As the main function of zooplankton-based reactor is to filter fine particles (<30 μm), removal efficiencies of E.coli and turbidity were improved showing the good performance of this reactor as a nature-based tertiary system. The system showed promising results at flow-rates between 750 and 1,500 L·d-1 and only for short periods of time (less than fifteen days) at 3,000 L·d-1. The effluent water obtained was suitable for reuse for different purposes such as agricultural irrigation and process water in conformity with Spanish legislation. These results demonstrate that the integrated system presented here can be used as an eco-sustainable wastewater treatment and also to provide an effluent suitable for reuse ; This research was carried out within the framework of the INNOQUA project, which was financially supported by the European Union's Horizon 2020 research and innovation programme under grant agreement No 689817