Application of Cation Exchange and Nanofiltration to Treat Flue Gas Desulfurization Wastewater
Ayush Raj Shahi
Bachelor’s in engineering in Civil Engineering
Master of Science in Civil Engineering
Flue gas emitted from coal-fired power plants is one of the major sources of sulfur and nitrogen oxides emissions to the atmosphere. Flue-gas desulfurization (FGD) is a pollution prevention method that is employed to meet regulatory requirements using scrubbers.
FGD wastewater contains high concentrations of dissolved salts which limit options for recycling and reuse. This thesis focused on treating FGD wastewater with a combination of ion exchange (IX), precipitation, and nanofiltration (NF) to improve the recovery of marketable materials and the recycling of water to minimize the disposal of wastewater. For IX, resins were used to perform laboratory batch and column experiments to determine the selectivity of the resin, design parameters and limitations for the removal of calcium. Nanofiltration (NF) was used for the removal of sulfate ions from the wastewater using NF membranes. Removal of trace contaminants, such as arsenic, mercury, nitrate, and selenium were studied in this process.
Ion Exchange, Nanofiltration, Flue Gas Desulfurization, Wastewater, Gypsum, Brucite
Department of Energy
Level of Degree
First Committee Member (Chair)
Dr. Kerry Howe
Second Committee Member
Dr. Bruce Thomson
Third Committee Member
Dr. Abdul-Mehdi S. Ali
Shahi, Ayush R.. "Application of Cation Exchange and Nanofiltration to treat Flue Gas Desulfurization Wastewater." (2019). https://digitalrepository.unm.edu/ce_etds/231