Dioxins, furans and PCBs in recycled water for indirect potable reuse.
An assessment of potential health impacts of dioxin and dioxin-like compounds in recycled water for indirect potable reuse was conducted. Toxic equivalency factors (TEFs) for 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (PCBs) congeners have been developed by the World Health Organization to simplify the risk assessment of complex mixtures. Samples of secondary treated wastewater in Perth, Australia were examined pre-and post-tertiary treatment in one full-scale and one pilot water reclamation plant. Risk quotients (RQs) were estimated by expressing the middle-bound toxic equivalent (TEQ) and the upper-bound TEQ concentration in each sampling point as a function of the estimated health target value. The results indicate that reverse osmosis (RO) is able to reduce the concentration of PCDD, PCDF and dioxin-like PCBs and produce water of high quality (RQ after RO=0.15). No increased human health risk from dioxin and dioxin-like compounds is anticipated if highly treated recycled water is used to augment drinking water supplies in Perth. Recommendations for a verification monitoring program are offered.
Rodriguez
Clemencia
C
School of Population Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Western Australia, 35 Stirling Hwy, (M431) Crawley WA 6009 Western Australia, Australia. clemencia.rodriguez@uwa.edu.au
Cook
Angus
A
Devine
Brian
B
Van Buynder
Paul
P
Lugg
Richard
R
Linge
Kathryn
K
Weinstein
Philip
P
D001315:Australia; D004147:Dioxins / Q000737:chemistry*; D005663:Furans / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D004147:Dioxins; D005663:Furans; D014874:Water Pollutants, Chemical; D014867:Water; D011078:Polychlorinated Biphenyls