title: Disinfection of gram-negative and gram-positive bacteria using DynaJets® hydrodynamic cavitating jets.
abstract: Cavitating jet technologies (DynaJets®) were investigated as a means of disinfection of gram-negative Escherichia coli, Klebsiellapneumoniae, Pseudomonas syringae, and Pseudomonas aeruginosa, and gram-positive Bacillus subtilis. The hydrodynamic cavitating jets were found to be very effective in reducing the concentrations of all of these species. In general, the observed rates of disinfection of gram-negative species were higher than for gram-positive species. However, different gram-negative species also showed significant differences (P. syringae 6-log(10) reduction, P. aeruginosa 2-log(10) reduction) under the same conditions. Disinfection of E. coli repeatedly showed five orders of magnitude reduction in concentration within 45-60-min at low nozzle pressure (2.1 bar). Optimization of nozzle design and operating pressures increased disinfection rates per input energy by several orders of magnitude. The power efficiencies of the hydrodynamic cavitating jets were found to be 10-100 times greater than comparable ultrasonic systems.
authors.affiliation: Dynaflow Inc, Jessup, MD 20794, USA. gregl@dynaflow-inc.com
authors.forename: Gregory
authors.initials: G
authors.lastname: Loraine
authors.forename: Georges
authors.initials: G
authors.lastname: Chahine
authors.forename: Chao-Tsung
authors.initials: CT
authors.lastname: Hsiao
authors.forename: Jin-Keun
authors.initials: JK
authors.lastname: Choi
authors.forename: Patrick
authors.initials: P
authors.lastname: Aley
mesh_terms: D018407:Bacterial Physiological Phenomena / Q000528:radiation effects*; D002470:Cell Survival / Q000528:radiation effects; D004203:Disinfection / Q000295:instrumentation* / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D019220:High-Energy Shock Waves; D011829:Radiation Dosage; D013010:Sonication / Q000295:instrumentation* / Q000379:methods*