Comparison of disinfection effect of pressurized gases of CO2, N2O, and N2 on Escherichia coli

Vo, Huy Thanh; Imai, Tsuyoshi; Teeka, Jantima; Sekine, Masahiko; Kanno, Ariyo; Le, Tuan Van; Higuchi, Takaya; Phummala, Kanthima; Yamamoto, Kōichi

doi:10.1016/j.watres.2013.04.053

Cited by 20 publications

(17 citation statements)

References 25 publications

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“…2). These findings are in accordance with those of a previous study (Vo et al, 2013); therefore, an operating pressure of 0.7 MPa was used for subsequent experiments.…”

Section: Results and Discussion Inactivation Effect Against T4 And Ms2supporting

confidence: 90%

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Disinfection Using Pressurized Carbon Dioxide Microbubbles to Inactivate Escherichia coli, Bacteriophage MS2 and T4

Imai

Yamamoto

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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This study investigated the potential application of pressurized CO 2 for water disinfection. Under supporting high pressure, a high volume of CO 2 microbubbles were produced in a liquid environment. Specifically, the inactivation effects of CO 2 against Escherichia coli, bacteriophage MS2 and T4 were examined at equal pressures (0.3 -0.9 MPa) and temperatures. The optimum conditions were found to be 0.7 MPa and an exposure time of 25 min. Under identical treatment conditions, a greater than 5.0 log reduction in E. coli was achieved, while over 3.0 log and nearly 4.0 log reductions were observed for phage MS2 and phage T4, respectively. Comparison of the inactivation effect of CO 2 , N 2 O, a common acid and buffer solution against phage MS2, revealed that the change in pH caused by CO 2 plays an important role in its virucidal effects. Moreover, the pumping cycle and depressurization rate contributed to the inhibition of microorganisms. Overall, the results of this study indicate that CO 2 has the potential for use as a disinfectant without the formation of by-products.

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“…2). These findings are in accordance with those of a previous study (Vo et al, 2013); therefore, an operating pressure of 0.7 MPa was used for subsequent experiments.…”

Section: Results and Discussion Inactivation Effect Against T4 And Ms2supporting

confidence: 90%

“…N 2 O was chosen since both N 2 O and CO 2 have analogous properties. The only distinction is that CO 2 lowers the pH in water but N 2 O does not (Vo et al, 2013). For the third disinfectant, neither CO 2 nor N 2 O was used, instead compressed air (from atmosphere) at 0.7 MPa was prepared for disinfection.…”

Section: Inactivation Mechanism Assessmentmentioning

confidence: 99%

Disinfection Using Pressurized Carbon Dioxide Microbubbles to Inactivate Escherichia coli, Bacteriophage MS2 and T4

Imai

Yamamoto

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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“…Some authors concluded that decompression rate is an important factor in inactivation due to the expansion of CO 2 into the cells (Fraser, 1951;Lin et al, 1992aLin et al, , 1992bKumugai et al, 1997;Cheng et al, 2011), while others found that it had no significant effect on bacterial inhibition and that mechanical cell bursting did not take place (Li et al, 2013;Debs-Louka et al, 1999;Nakamura et al, 1994;Vo et al, 2013a). Enomoto et al (1997b) found that explosive depressurization with pressures over 4 MPa had a strong effect on inhibition, but not at less than 4 MPa.…”

Section: Treatment Time Pressure Cycling Microbial Type Depressurimentioning

confidence: 99%

“…This ease of CO 2 movement does not cause differences in pH on the two sides of the cell membrane. Another factor of high pressure CO 2 , cellular lipid extraction, leads to the surface of cell membrane changing and collapsing (Li et al, 2013;Vo et al, 2013a).…”

Section: Membrane Damagementioning

confidence: 99%

Potential application of high pressure carbon dioxide in treated wastewater and water disinfection: Recent overview and further trends

Imai

et al. 2015

Journal of Environmental Sciences

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“…In recent years, pressurized CO 2 has shown great potential as a sustainable disinfection technology in water and wastewater treatment applications [16][17][18][19][20][21][22] largely because this method does not generate DBPs [9,22]. Kobayashi et al [16,17] employed CO 2 microbubbles in the treatment of drinking water and succeeded in inhibiting Escherichia coli within 13.3 min.…”

Section: Introductionmentioning

confidence: 99%

<i>Escherichia coli</i> Inactivation Using Pressurized Carbon Dioxide as an Innovative Method for Water Disinfection

Imai¹,

Dang²

2017

≪i>Escherichia ColiSelf Cite

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Advanced water disinfection technologies that do not produce harmful by-products would be highly desirable. This study presents results for the use of pressurized carbon dioxide (CO 2) and a liquid-film-forming apparatus for disinfection of seawater. The sensitivity of Escherichia coli to the pressurized CO 2 was examined for various conditions of pressure, temperature, working volume ratios (WVRs), flow rates, and pressure cycling. Morphology of E. coli was observed by using scanning electron microscopy (SEM). A strong correlation between the E. coli inactivation efficiency and pressure cycling was detected (p < 0.001). The frequency and magnitude of pressure cycling were the key factors responsible for high rates of E. coli inactivation during the pressurized CO 2 treatment. The results from linear regression analyses suggest that the model can explain about 91% of the E. coli inactivation efficiency (p < 0.001). The pressurized CO 2 treatment (at 0.7 MPa, 20°C, 50% WVR) in the process involving pressure cycling (∆P = 0.12 MPa, 15 cycles) resulted in complete inactivation (5.2 log reduction) of E. coli within 3 min. These findings suggest that pressurized CO 2 could be a potentially useful disinfection method for water treatment.

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Comparison of disinfection effect of pressurized gases of CO2, N2O, and N2 on Escherichia coli

Cited by 20 publications

References 25 publications

Disinfection Using Pressurized Carbon Dioxide Microbubbles to Inactivate Escherichia coli, Bacteriophage MS2 and T4

Disinfection Using Pressurized Carbon Dioxide Microbubbles to Inactivate Escherichia coli, Bacteriophage MS2 and T4

Potential application of high pressure carbon dioxide in treated wastewater and water disinfection: Recent overview and further trends

<i>Escherichia coli</i> Inactivation Using Pressurized Carbon Dioxide as an Innovative Method for Water Disinfection

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