Hydrodynamic cavitation using vortex diode: An efficient approach for elimination of pathogenic bacteria from water
| Autor: | D. J. Killedar, Vivek V. Ranade, Jyotsnarani Jena, Pooja Jain, Vinay M. Bhandari, Kshama Balapure |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Staphylococcus aureus
Materials science Environmental Engineering 0208 environmental biotechnology First-order reaction 02 engineering and technology Wastewater treatment 010501 environmental sciences Management Monitoring Policy and Law medicine.disease_cause 01 natural sciences Water Purification Escherichia coli medicine Waste Management and Disposal 0105 earth and related environmental sciences Diode Pressure drop Cavitation Water Pathogenic bacteria General Medicine Mechanics Pollution 020801 environmental engineering Vortex Disinfection Kinetics Hydrodynamics Water treatment Body orifice |
| Zdroj: | Jain, P, Bhandari, V M, Balapure, K, Jena, J, Ranade, V V & Killedar, D J 2019, ' Hydrodynamic cavitation using vortex diode: An efficient approach for elimination of pathogenic bacteria from water ', Journal of Environmental Management, vol. 242, pp. 210-219 . https://doi.org/10.1016/j.jenvman.2019.04.057 |
| DOI: | 10.1016/j.jenvman.2019.04.057 |
| Popis: | The present study successfully demonstrates greener methodology of hydrodynamic cavitation using rotational flows for disinfection of water. Disinfection of two model microbial strains-gram- negative (Escherichia coli) and gram-positive (Staphylococcus aureus) using vortex diode was evaluated. The removal efficacy was quantified for two different cavitation reactors. Practically complete elimination of E. coli was achieved (99%) after 1 h of cavitation at a pressure drop of only 0.5 bar. However, elimination of S. aureus using vortex diode was observed to be lower in comparison to the removal of E. coli and only 60% disinfection could be achieved under similar conditions, which can be subsequently enhanced up to 98% by increasing pressure drop. The results were compared with another cavitating device that employs linear flow for cavitation, orifice. The reactor geometry has significant impact on the disinfection process and orifice was found to require significantly higher pressure drop (10 bar) conditions for disinfection and for eliminating gram-positive bacteria with high efficiency. A plausible mechanism for disinfection was proposed to elucidate the role of cavitation in cell destruction leading to death of cells through the rupture of cell wall, oxidative damage and possible DNA denaturation. Also, a cavitation model using per pass disinfection was developed that can provide meaningful physical description of the disinfection process as against the conventional first order reaction rate model. This study would provide meaningful insight into cavitation process based on hydrodynamic cavitation for the destruction of both gram-negative and gram-positive bacteria from various water sources, including industrial wastewaters. |
| Databáze: | OpenAIRE |
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