Paper Summary:

The Deloro Mine is a now closed facility that during its operating period, contaminated ground water with high concentrations of arsenic. The arsenic now needs to be removed to prevent entry into drinking water supplied to consumers. The paper begins by outlining the most common methods of arsenic removal in use today. The author then discusses steps taken by mine owners to prevent further contamination from the disused mine and technologies put in place to remove the arsenic concentrations from the ground water. Finally, the author examines new technologies that now exist and that could facilitate more efficient and safe removal of contaminants before making his final recommendations.

Outline:
Arsenic Remediation Technologies
Oxidation
Coagulation/Co-Precipitation
Physical Removal Processes
Chemical Processes
Which Technology is currently being used to treat arsenic at the
Deloro Mines?
State of the Art in Arsenic Removal Technology

From the Paper:

"As one can see, there are a number of treatment options available for the removal of arsenic in groundwater. There is no single best solution that will result in maximum results at all sites. These technologies are often combined to meet the needs of each individual situation. Treatment at the Deloro Mine uses chemical coagulation followed by sedimentation to process the effluent that will eventually be dumped back into the Moira River.
"The amount of contamination at Deloro Mine is enormous. Cleanup efforts have only been marginally successful in reducing the amount of arsenic entering into individual homes. One must remember that although efforts are being taken now to clean up arsenic in the area, many private drinking wells have been contaminated for many years. The state of New Jersey faced a similar problem with widespread arsenic contamination. They resolved the issue by controlling arsenic at the point of entry into the house. They now require residential adsorption treatment system for every individual home."

Sample of Sources Used:

• American Chemical Society. (2006). Nanoparticles remove arsenic from drinking waterEnvironmental Science and Technology. June 21, 2006. http://pubs.acs.org/subscribe/journals/esthag-w/2006/jun/tech/pp_arsenic.html
• Clifford, D. 1999. "Ion Exchange and Inorganic Adsorption. In: Letterman {Ed]. Water Quality and Treatment, 5th Edition. American Water Works Association, McGraw Hill, New York.
• Johnston, R. and Heijnen, H. 2001. "Safe Water Technology for Arsenic Removal." In: Ahmed, M.F. et. al. [Eds]. Technologies for Arsenic Removal from Drinking Water. Bangladesh University of Engineering and Technology, Dhaka. Bangladesh. http://www.unu.edu/env/Arsenic/Han.pdf
• Massachusetts Institute of Technology. (MIT) (2001). Arsenic Remediation Technologies: Online Informational Database. http://web.mit.edu/murcott/www/arsenic/database.html
• Ministry of the Environment. (2007). Arsenic Treatment. http://www.ene.gov.on.ca/envision/deloro/aresenicplant.htm

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