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.

Microbial disinfection of seawater using hydrodynamic cavitation

“…Similar observation is reported by Loraine et.al. [28]. The work is related to the disinfection of E. coli and B. Subtilis using different cavitating devices such as orifice plates and nozzles.…”

Disinfecting Water with the Carbon Fiber-Based Flow-Through Electrode System (FES): Towards Axial Dispersion and Velocity Profile

“…The distinction in elimination performance among two sorts of microbes may be related to the constitution of cell walls (peptidoglycan and teichoic acids) [ [33]. The peptidoglycan film of Gram-positive bacteria was much thicker, which was linked to their resistance [34]. However, the cells of Gram-negative microorganisms were not as robust as Gram-positive microorganisms and effortless to be demobilized for the thin peptidoglycan membrane with an outer membrane consisting of lipopolysaccharides and lipoproteins [27].…”

Hydrodynamic Characterization of Physicochemical Process in Stirred Tanks and Agglomeration Reactors

“…A quick survey of the studies in this field shows that many innovative process reactors have been successfully tested on different scales for a wide variety of technical applications ranging from fine particle separation and water purification to cell culture preparation [1][2][3][4][5][6]. Experimental data, which are collected in these studies for numerical validation purposes, are often used to characterize the hydrodynamic behaviour as well as to quantify the fluid parameters of interest such as the flow velocity profile, vorticity, turbulent kinetic energy and its rate of dissipation, turbulent intensity, and so on.…”