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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4982

Title: Valuing the subsurface pathogen treatment barrier in water recycling via aquifers for drinking supplies
Authors: Page, D
Dillon, P
Toze, S
Bixio, D
Genthe, B
Cisneros, BEJ
Wintgens, T
Keywords: Aquifer
Water recycling
Microbial risk assessment
Human health
Pathogens
Drinking water
Water research
Issue Date: Mar-2010
Publisher: Elsevier
Citation: Page, D, Dillon, P, Toze, S et al. 2010. Valuing the subsurface pathogen treatment barrier in water recycling via aquifers for drinking supplies. Water Research, Vol. 44(6), pp 1841-1852
Series/Report no.: Workflow request;3475
Abstract: A quantitative microbial risk assessment C(QMRA) was performed at four managed aquifer recharge (MAR) sites (Australia, South Africa, Belgium, Mexico) where reclaimed wastewater and stormwater is recycled via aquifers for drinking water supplies, using the same risk-based approach that is used for public water supplies. For each of the sites, the aquifer treatment barrier was assessed for its log10 removal capacity much like for other water treatment technologies. This information was then integrated into a broader risk assessment to determine the human health burden from the four MAR sites. For the Australian and South African cases, managing the aquifer treatment barrier was found to be critical for the schemes to have low risk. For the Belgian case study, the large treatment trains both in terms of pre- and post-aquifer recharge ensures that the risk is always low. In the Mexico case study, the risk was high due to the lack of pre-treatment and the low residence times of the recharge water in the aquifer. A further sensitivity analysis demonstrated that human health risk can be managed if aquifers are integrated into a treatment train to attenuate pathogens. However, reduction in human health disease burden (as measured in disability adjusted life years, DALYs) varied depending upon the number of pathogens in the recharge source water. The beta-Poisson dose response curve used for translating rotavirus and Cryptosporidium numbers into DALYs coupled with their slow environmental decay rates means poor quality injectant leads to aquifers having reduced value to reduce DALYs. For these systems, like the Mexican case study, longer residence times are required to meet their DALYs guideline for drinking water. Nevertheless the results showed that the risks from pathogens can still be reduced and recharging via an aquifer is safer than discharging directly into surface water bodies
Description: Copyright: 2010 Elsevier. This is the pre print version of the work. The definitve version is published in Water Research, Vol. 44(6), pp 1841-1852
URI: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V73-4XY4JX5-1-F&_cdi=5831&_user=958262&_pii=S0043135409008203&_origin=browse&_coverDate=03%2F31%2F2010&_sk=999559993&view=c&wchp=dGLzVzb-zSkzV&md5=54a4427769f9dd58423f094adafff068&ie=/sdarticle.pdf
http://hdl.handle.net/10204/4982
ISSN: 0043-1354
Appears in Collections:Sustainability science
Environmental management
Water resources and human health
General science, engineering & technology

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