Water sterilisation using different hot gases in a bubble column reactor

A. Garrido; R. M. Pashley; B. W. Ninham

doi:10.1016/j.jece.2018.04.004

Water sterilisation using different hot gases in a bubble column reactor

A. Garrido, R. M. Pashley^*, B. W. Ninham

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

This study compares the effect of using a range of different hot gases to sterilise water at atmospheric pressure within a hot bubble column evaporator (HBCE) reactor. Water containing bacteria (E.coli ATCC 15597) and viruses (MS2 ATCC 15597-B1) was sterilized with 6 different gases (CO₂, N₂, O₂, Ar, air and combustion gas) at inlet temperatures of 200°C (for viruses) and 150°C (for bacteria). The results obtained suggest three different gas dependent sterilisation mechanisms: a thermal inactivation mechanism, based on heat transfer between hot gas bubbles for argon, air and nitrogen; a CO₂ specific inactivation mechanism, based on the penetration of CO₂ molecules through bacterial membranes and virus capsids; and an oxidation/combustion mechanism that inactivates only E.coli, essentially by direct contact with oxygen or through reactive oxygen species. CO₂ gas and combustion gases gave the best inactivation results with viruses and O₂ gas was found to be most effective for the destruction of E.coli.

Original language	English
Pages (from-to)	2651-2659
Number of pages	9
Journal	Journal of Environmental Chemical Engineering
Volume	6
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2018.04.004
Publication status	Published - Apr 2018

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@article{82dfbb6fb0204675889bdefeebcceb14,

title = "Water sterilisation using different hot gases in a bubble column reactor",

abstract = "This study compares the effect of using a range of different hot gases to sterilise water at atmospheric pressure within a hot bubble column evaporator (HBCE) reactor. Water containing bacteria (E.coli ATCC 15597) and viruses (MS2 ATCC 15597-B1) was sterilized with 6 different gases (CO2, N2, O2, Ar, air and combustion gas) at inlet temperatures of 200°C (for viruses) and 150°C (for bacteria). The results obtained suggest three different gas dependent sterilisation mechanisms: a thermal inactivation mechanism, based on heat transfer between hot gas bubbles for argon, air and nitrogen; a CO2 specific inactivation mechanism, based on the penetration of CO2 molecules through bacterial membranes and virus capsids; and an oxidation/combustion mechanism that inactivates only E.coli, essentially by direct contact with oxygen or through reactive oxygen species. CO2 gas and combustion gases gave the best inactivation results with viruses and O2 gas was found to be most effective for the destruction of E.coli.",

keywords = "Carbon dioxide, E.coli, Inactivation, MS2 virus, Oxidation, Water reuse, Water sterilization",

author = "A. Garrido and Pashley, {R. M.} and Ninham, {B. W.}",

year = "2018",

month = apr,

doi = "10.1016/j.jece.2018.04.004",

language = "English",

volume = "6",

pages = "2651--2659",

journal = "Journal of Environmental Chemical Engineering",

issn = "2213-2929",

publisher = "Elsevier B.V.",

number = "2",

}

TY - JOUR

T1 - Water sterilisation using different hot gases in a bubble column reactor

AU - Garrido, A.

AU - Pashley, R. M.

AU - Ninham, B. W.

PY - 2018/4

Y1 - 2018/4

N2 - This study compares the effect of using a range of different hot gases to sterilise water at atmospheric pressure within a hot bubble column evaporator (HBCE) reactor. Water containing bacteria (E.coli ATCC 15597) and viruses (MS2 ATCC 15597-B1) was sterilized with 6 different gases (CO2, N2, O2, Ar, air and combustion gas) at inlet temperatures of 200°C (for viruses) and 150°C (for bacteria). The results obtained suggest three different gas dependent sterilisation mechanisms: a thermal inactivation mechanism, based on heat transfer between hot gas bubbles for argon, air and nitrogen; a CO2 specific inactivation mechanism, based on the penetration of CO2 molecules through bacterial membranes and virus capsids; and an oxidation/combustion mechanism that inactivates only E.coli, essentially by direct contact with oxygen or through reactive oxygen species. CO2 gas and combustion gases gave the best inactivation results with viruses and O2 gas was found to be most effective for the destruction of E.coli.

AB - This study compares the effect of using a range of different hot gases to sterilise water at atmospheric pressure within a hot bubble column evaporator (HBCE) reactor. Water containing bacteria (E.coli ATCC 15597) and viruses (MS2 ATCC 15597-B1) was sterilized with 6 different gases (CO2, N2, O2, Ar, air and combustion gas) at inlet temperatures of 200°C (for viruses) and 150°C (for bacteria). The results obtained suggest three different gas dependent sterilisation mechanisms: a thermal inactivation mechanism, based on heat transfer between hot gas bubbles for argon, air and nitrogen; a CO2 specific inactivation mechanism, based on the penetration of CO2 molecules through bacterial membranes and virus capsids; and an oxidation/combustion mechanism that inactivates only E.coli, essentially by direct contact with oxygen or through reactive oxygen species. CO2 gas and combustion gases gave the best inactivation results with viruses and O2 gas was found to be most effective for the destruction of E.coli.

KW - Carbon dioxide

KW - E.coli

KW - Inactivation

KW - MS2 virus

KW - Oxidation

KW - Water reuse

KW - Water sterilization

UR - http://www.scopus.com/inward/record.url?scp=85045299619&partnerID=8YFLogxK

U2 - 10.1016/j.jece.2018.04.004

DO - 10.1016/j.jece.2018.04.004

M3 - Article

SN - 2213-2929

VL - 6

SP - 2651

EP - 2659

JO - Journal of Environmental Chemical Engineering

JF - Journal of Environmental Chemical Engineering

IS - 2

ER -

Water sterilisation using different hot gases in a bubble column reactor

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