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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 2, 2015, pp. 527-536
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Bioline Code: st15048
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 2, 2015, pp. 527-536
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Reduction in health risk induced by semi-volatile organic compounds and metals in a drinking water treatment plant
Zhao, F.; Yin, J.; Zhang, X.X.; Chen, Y.; Zhang, Y.; Wu, B. & Li, M.
Abstract
This study investigated health risk reduction in
a drinking water treatment plant of Nanjing City (China)
based on chemical detection of 22 semi-volatile organic
compounds (SVOCs) and 24 metallic elements in source
water and drinking water during 2009–2011. Chemical
analysis showed that 15 SVOCs and 9 metals were present
in the water. Health risk assessment revealed that hazard
quotient of each pollutant and hazard index (HI) of all the
detectable pollutants were below 1.00, indicating that the
chemicals posed negligible non-carcinogenic risk to local
residents. Benzo(a)pyrene may induce carcinogenic risk
since its risk index via both oral and dermal exposure
exceeded the safety level (1.00E-6), but other SVOCs
induced no carcinogenic risk. Total HI of the SVOCs was
1.08E-3 for the source water and 1.56E-3 for the
drinking water, suggesting that the used conventional
treatment processes (coagulation/sedimentation, sand filtration
and chlorine disinfection) cannot effectively reduce
the non-carcinogenic risk. The source water had higher
carcinogenic risk than the drinking water, but risk index of
the drinking water still exceeded 1.00E-6. This study
might serve as a basis for health risk assessment of
drinking water and also as a benchmark for the authorities
to reduce health risk arising from trace-level hazardous
pollutants.
Keywords
Carcinogenic risk; Metallic elements; Non-carcinogenic risk; Semi-volatile organic compounds; Source and drinking water
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