Development of High Erosivity Well Scale Cleaning Tools

Kalumuck, Kenneth; Chahine, Georges L.; Frederick, G.S.; Aley, P.

doi:10.2172/13837

Cited by 9 publications

(9 citation statements)

References 4 publications

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“…A selective release of invertase from the Bakers' yeast by hydrodynamic cavitation compared to other disruption methods, such as bead mill and ultrasonication, has been reported (16). The energy efficiency of this technique has also been reported at several instances (4 − 6, 12, 13, 17, 18). The effect of cavitation number, number of passes and growth rate of E. coli on the extent and rate of release of total soluble protein, acid phosphatase and β‐galactosidase was investigated in the current study.…”

Section: Introductionmentioning

confidence: 74%

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Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Balasundaram

Harrison

2006

Biotechnol. Prog.

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Hydrodynamic cavitation results in flow restriction in a flow system causing rapid pressure fluctuations and significant fluid forces. These can be harnessed to mediate microbial cell damage. Hydrodynamic cavitation was studied for the partial disruption of E. coli and selective release of specific proteins relative to the total soluble protein. The effects of the cavitation number, the number of passes, and the specific growth rate of E. coli on the release of periplasmic and cytoplasmic proteins were studied. At the optimum cavitation number of 0.17 for this experimental configuration, 48% of the total soluble protein, 88% of acid phosphatase, and 67% of beta-galactosidase were released by hydrodynamic cavitation in comparison with the maximum release attained using multiple passes through the French Press. The higher release of the acid phosphatase over the total soluble protein suggested preferred release of periplasmic compounds. This was supported by SDS-PAGE analysis. The absence of micronization of cell material resulting in the potential for ease of solid-liquid separation downstream of the cell disruption operation was confirmed by TEM microscopy. E. coli cells cultivated at a higher specific growth rate (0.36 h(-1)) were more easily disrupted than slower grown cells (0.11 h(-1)). The specific activity of the enzyme of interest released by hydrodynamic cavitation, defined as the units of enzyme in solution per milligram of total soluble protein, was greater than that obtained on release by the French Press, high-pressure homogenization, osmotic shock, and EDTA treatment. The selectivity offered indicates the potential of enzyme release by hydrodynamic cavitation to ease the purification in the subsequent downstream processing.

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Section: Introductionmentioning

confidence: 74%

“…The physical effects include the generation of shock waves (8), the water hammer effect (9, 10), and radial bubble motion (11). The chemical effects of cavitation are due to the generation of free radicals (12 − 14). The extent of these effects depends on the intensity of cavitation.…”

Section: Introductionmentioning

confidence: 99%

Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Balasundaram

Harrison

2006

Biotechnol. Prog.

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“…[182][183][184][185] However, industrial application of ultrasonically induced cavitation is a problem due to ineffective distribution of the cavitational activity on a large scale. 186,187 Wang et al 168 studied the efficiency of combined treatment in which they used photocatalysis and water jet cavitation on reactive red 2 dye degradation. The results showed a signicant enhancement of photocatalytic activity up to ca.…”

Section: Photocatalysis By Adopting Advanced Oxidation Proceduresmentioning

confidence: 99%

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

et al. 2014

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“…In addition, the efficiency of the transfer of electric power into the liquid by ultrasonic waves is known to be quite low, ca. 15 % [27]. Recently, a comparison between hydrodynamic and sonochemical reactors has been reviewed by citing different reactions, e.g., oxidation of toluene, xylene, mesitylene, nitrotoluene, chlorotoluene, and synthesis of biodiesel [9,28].…”

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confidence: 99%

Degradation of Chlorocarbons Driven by Hydrodynamic Cavitation

Ondruschka

Bräutigam

2007

Chem Eng & Technol

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To provide an efficient lab-scale device for the investigation of the degradation of organic pollutants driven by hydrodynamic cavitation, the degradation kinetics of chloroform and carbon tetrachloride and the increase of conductivity in aqueous solutions were measured. These are values which were not previously available. Under hydrodynamic cavitation conditions, the degradation kinetics for chlorocarbons was found to be pseudo first-order. Meanwhile, C-H and C-Cl bonds are broken, and Cl 2 , Cl . , Cl -and other ions released can increase the conductivity and enhance the oxidation of KI in aqueous solutions. The upstream pressures of the orifice plate, the cavitation number, and the solution temperature have substantial effects on the degradation kinetics. A decreased cavitation number can result in more cavitation events and enhances the degradation of chlorocarbons and/or the oxidation of KI. A decrease in temperature is generally favorable to the cavitation chemistry. Organic products from the degradation of carbon tetrachloride and chloroform have demonstrated the formation and recombination of free radicals, e.g., CCl 4 , C 2 Cl 4 , and C 2 Cl 6 are produced from the degradation of CHCl 3 . CHCl 3 and C 2 Cl 6 are produced from the degradation of CCl 4 . Both the chemical mechanism and the reaction kinetics of the degradation of chlorocarbons induced by hydrodynamic cavitation are consistent with those obtained from the acoustic cavitation. Therefore, the technology of hydrodynamic cavitation should be a good candidate for the removal of organic pollutants from water. IntroductionCavitation is the formation, growth, and implosive collapse of gas or vapor-filled bubbles in liquids [1]. Turbulent flow, laser, electrical discharge, boiling, radiolysis, and ultrasonic irradiation can cause cavitational bubbles. The collapse of cavities generates extreme energy for chemical and mechanical effects. It has been experimentally estimated that extreme conditions exist inside the medium for an extremely short time, e.g., temperatures of about 5000°C and pressures of ca. 50-100 MPa exist inside the collapsing cavity [2,3].Hydrodynamic cavitation is produced by pressure variations in a flowing liquid due to the geometry of the system. It can simply be generated by a rotating propeller blade, high-speed homogenizer and jet fluidizer (e.g., the high-velocity passage of the liquid through a constriction such as a throttling valve, orifice plate, and venturi). Although light emission from hydrodynamic cavitations was observed in the 1960's [4], the chemical effects of hydrodynamic cavitation have only been properly investigated since 1993 [5][6][7][8][9]. Hydrodynamic cavitation has been recently employed in the preparation of nanostructured materials [10,11], the removal of chemicals from wastewater treatment [12][13][14][15][16][17][18][19], water disinfection [20], and the degradation of polymers [21,22].Chlorocarbons consist of chloromethane, dichloromethane, chloroform, carbon tetrachloride, trichloroethylene, tetra...

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Development of High Erosivity Well Scale Cleaning Tools

Cited by 9 publications

References 4 publications

Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

Degradation of Chlorocarbons Driven by Hydrodynamic Cavitation

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Development of High Erosivity Well Scale Cleaning Tools

Cited by 9 publications

References 4 publications

Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Study of Physical and Biological Factors Involved in the Disruption of E. coli by Hydrodynamic Cavitation

Principles and mechanisms of photocatalytic dye degradation on TiO2based photocatalysts: a comparative overview

Degradation of Chlorocarbons Driven by Hydrodynamic Cavitation

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Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview