Spatio-temporal dynamics of virus and bacteria removal in dual-media contact-filtration for drinking water
| Autor: | Vegard Nilsen, Ekaterina Christensen, Mette Myrmel, Arve Heistad |
|---|---|
| Přispěvatelé: | Biomedicina, Biotecnología y Salud Pública, Biología, Ingeniería Química y Tecnología de Alimentos |
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Microorganism 0208 environmental biotechnology virus 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification law.invention Drinking water Filtration Virus Dynamics Modeling law Escherichia coli Turbidity Waste Management and Disposal Effluent Filtration 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering filtration Bacteria biology Chemistry Drinking Water Ecological Modeling drinking water modeling dynamics Filtracion virus y bacterias Agua potable biology.organism_classification Pulp and paper industry Pollution 020801 environmental engineering Filter (aquarium) Filter design Water treatment |
| Zdroj: | Warter Research 156 ( 2019) 9-12 Water Research-2019, vol. 156 pp. 9-22 Water Research 156 (2019) 9-22 RODIN. Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz instname Water Research 156 (2019) 9e22 Water Research-2019, Vol. 156, pp. 9-22 RODIN: Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz Universidad de Cádiz |
| ISSN: | 0043-1354 |
| Popis: | Microorganism removal efficiencies in deep bed filters vary with time and depth in the filter bed as the filter collects particles. Improved knowledge of such dynamics is relevant for the design, operation and microbial risk assessment of filtration processes for drinking water treatment. Here we report on a highresolution spatio-temporal characterization of virus and bacteria removal in a pilot-scale dual-media filter, operated in contact-filtration mode. Microorganisms investigated were bacteriophage Salmonella typhimurium 28B (plaque assay, n ¼ 154)), fRNA phage MS2 (plaque assay/RT-qPCR, n ¼ 87) and E. coli (Colilert-18, n ¼ 73). Microscopic and macroscopic filtration models were used to investigate and characterize the removal dynamics. Results show that ripening/breakthrough fronts for turbidity, viruses and E. coli migrated in a wavelike manner across the depth of the filter. Virus removal improved continuously throughout the filter cycle and viruses broke through almost simultaneously with turbidity. Ripening for E. coli took longer than ripening for turbidity, but the bacteria broke through before turbidity breakthrough. Instantaneous log-removal peaked at 3.2, 3.0 and 4.5 for 28B, MS2 and E. coli, respectively. However, true average logremoval during the period of stable effluent turbidity was significantly lower at 2.5, 2.3 and 3.6, respectively. Peak observed filter coefficients l were higher than predicted by ideal filtration theory. This study demonstrates the importance of carefully designed sampling regimes when characterizing microorganism removal efficiencies of deep bed filters. Research Council of Norway (grant no. 226750/O30) and Norconsult AS consultancy firm 14 Páginas |
| Databáze: | OpenAIRE |
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