Location
Grand Rapids, Michigan
Start Date
14-5-2024 1:30 PM
End Date
14-5-2024 2:00 PM
Description
Arsenic Treatment from Coal Ash Pond Groundwater Authors Dr. Jack Ma - United States - UCC Environmental Mr. David Donkin - United States - UCC Environmental Mr. Morgan French - United States - UCC Environmental Abstract This paper focuses on the treatment of groundwater from coal ash ponds, specifically addressing the methods used for removing arsenic. The coal-fired power industry has placed a high priority on developing cost-effective and reliable technologies for removing arsenic, selenium, and mercury from water. Typically, the goal for arsenic treatment is to reach concentrations around 10 µg/L, either due to regulatory requirements or site-specific needs. Environmental standards in North America have the potential to become even more stringent. Achieving these low levels presents several challenges, including: • Fluctuating flows that can significantly vary over time affecting arsenic removal. • High variability in arsenic levels and forms, even within the same location. • The influence of water characteristics, such as pH, temperature, and other interfering constituents, on arsenic removal. • The production of concentrated residuals during arsenic treatment, which can potentially release arsenic. • Stringent arsenic standards that are very close to the limits of analytical detection. In addition to discussing various physical and chemical technologies for arsenic treatment, this paper also presents insights gained from a full-scale case study involving the removal of arsenic from coal ash pond groundwater. The treatment process is designed as a robust system that includes equalization, multi-chemical injection, clarification, and staged filtration.
Document Type
Event
Arsenic Treatment from Coal Ash Pond Groundwater
Grand Rapids, Michigan
Arsenic Treatment from Coal Ash Pond Groundwater Authors Dr. Jack Ma - United States - UCC Environmental Mr. David Donkin - United States - UCC Environmental Mr. Morgan French - United States - UCC Environmental Abstract This paper focuses on the treatment of groundwater from coal ash ponds, specifically addressing the methods used for removing arsenic. The coal-fired power industry has placed a high priority on developing cost-effective and reliable technologies for removing arsenic, selenium, and mercury from water. Typically, the goal for arsenic treatment is to reach concentrations around 10 µg/L, either due to regulatory requirements or site-specific needs. Environmental standards in North America have the potential to become even more stringent. Achieving these low levels presents several challenges, including: • Fluctuating flows that can significantly vary over time affecting arsenic removal. • High variability in arsenic levels and forms, even within the same location. • The influence of water characteristics, such as pH, temperature, and other interfering constituents, on arsenic removal. • The production of concentrated residuals during arsenic treatment, which can potentially release arsenic. • Stringent arsenic standards that are very close to the limits of analytical detection. In addition to discussing various physical and chemical technologies for arsenic treatment, this paper also presents insights gained from a full-scale case study involving the removal of arsenic from coal ash pond groundwater. The treatment process is designed as a robust system that includes equalization, multi-chemical injection, clarification, and staged filtration.
