Use of static Quantitative Microbial Risk Assessment to determine pathogen risks in an unconfined carbonate aquifer used for Managed Aquifer Recharge

Toze, S, Bekele, E, Page, D, Sidhu, J and Shackleton, M (2010) Use of static Quantitative Microbial Risk Assessment to determine pathogen risks in an unconfined carbonate aquifer used for Managed Aquifer Recharge. Water Research, 44 4: 1038-1049. doi:10.1016/j.watres.2009.08.028


Author Toze, S
Bekele, E
Page, D
Sidhu, J
Shackleton, M
Title Use of static Quantitative Microbial Risk Assessment to determine pathogen risks in an unconfined carbonate aquifer used for Managed Aquifer Recharge
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2010-02-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2009.08.028
Volume 44
Issue 4
Start page 1038
End page 1049
Total pages 12
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2011
Language eng
Formatted abstract
Managed Aquifer Recharge (MAR) is becoming a mechanism used for recycling treated
wastewater and captured urban stormwater and is being used as a treatment barrier to
remove contaminants such as pathogens from the recharged water. There is still a need,
however, to demonstrate the effectiveness of MAR to reduce any residual risk of pathogens
in the recovered water. A MAR research site recharging secondary treated wastewater in an
unconfined carbonate aquifer was used in conjunction with a static Quantitative Microbial
Risk Assessment (QMRA) to assess the microbial pathogen risk in the recovered water
following infiltration and aquifer passage. The research involved undertaking a detailed
hydrogeological assessment of the aquifer at the MAR site and determining the decay rates
of reference pathogens from an in-situ decay study. These variables along with literature
data were then used in the static QMRA which demonstrated that the recovered water at
this site did not meet the Australian Guidelines for recycled water when used for differing
private green space irrigation scenarios. The results also confirmed the importance of
obtaining local hydrogeological data as local heterogeneity can influence of residence time
in the aquifer which, in turn, influences the outcomes. The research demonstrated that
a static QMRA can be used to determine the residual risk from pathogens in recovered
water and showed that it can be a valuable tool in the preliminary design and operation of
MAR systems and the incorporation of complementary engineered treatment processes to
ensure that there is acceptable health risk from the recovered water.
Crown Copyright © 2009 Published by Elsevier Ltd. All rights reserved.
Keyword Managed Aquifer Recharge
Quantitative Microbial Risk
Assessment
Recycled water
Virus
Cryptosporidium
Groundwater
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Public Health Publications
 
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Created: Sun, 28 Mar 2010, 10:00:44 EST