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Arsenic removal from water using advanced oxidation processes.

Myint Zaw1, Maree T Emett

  • 1Australian Nuclear Science and Technology Organisation, Environment Division, PMB 1, Menai, NSW 2234, Australia. mzx@ansto.gov.au

Toxicology Letters
|June 22, 2002
PubMed
Summary

Arsenic in drinking water causes cancer. Advanced oxidation methods using iron or sulfite as photoabsorbers effectively remove arsenic from groundwater, protecting public health.

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Area of Science:

  • Environmental Science
  • Public Health
  • Water Chemistry

Background:

  • Groundwater contamination with natural arsenic at high concentrations (hundreds of microg/l) in regions like Bangladesh is linked to increased cancer rates (skin, bladder).
  • Lower arsenic levels (tens of microg/l) in drinking water in countries such as the USA and Australia are raising concerns, prompting stricter regulations.
  • Arsenic exists in reduced forms in anaerobic groundwater, necessitating oxidation for effective removal by conventional methods like precipitation or ion exchange.

Purpose of the Study:

  • To address the health risks associated with arsenic in drinking water.
  • To present advanced oxidation methods for arsenic removal from contaminated groundwaters.
  • To highlight the use of specific photoabsorbers for enhanced arsenic remediation.

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Main Methods:

  • Development and patenting of advanced oxidation processes utilizing ultraviolet (UV) light.
  • Investigation of iron salts as photoabsorbers for arsenic removal.
  • Exploration of sulfite as a photoabsorber for arsenic remediation in groundwater.

Main Results:

  • Advanced oxidation methods offer a viable solution for arsenic removal from drinking water sources.
  • Iron salts have been successfully developed as photoabsorbers for arsenic removal, particularly for rural applications in Bangladesh.
  • Sulfite has been identified and developed as an effective photoabsorber for arsenic removal from groundwaters in countries like the USA.

Conclusions:

  • Advanced oxidation processes with photoabsorbers are effective for removing toxic arsenic from drinking water.
  • Tailored photoabsorber selection (iron salts or sulfite) can optimize arsenic removal strategies for different geographical contexts and contamination levels.
  • These methods contribute to improving public health by reducing exposure to harmful levels of arsenic in water supplies.