@article{a8e5c6a3c7cb4865b7a9b4b1acfa5ba3,
title = "Layered double hydroxide sorbents for removal of selenium from power plant wastewaters",
abstract = "Selenium is an essential trace element but is increasingly becoming a contaminant of concern in the electric power industry due to the challenges of removing solubilized selenate anions, particularly in the presence of sulfate. In this work, we evaluate granulated layered double hydroxide (LDH) materials as sorbents for selenium removal from wastewaters obtained from a natural gas power plant with the aim to elucidate the effect of competing ions on the sorption capacities for selenium removal. We first present jar test data, followed by small-scale column testing in 0.43 inch (1.1 cm) and 2 inch (5.08 cm) diameter testbed columns for the treatment of as-obtained cooling tower blowdown waters and plant wastewaters. Finally, we present field results from a pilot-scale study evaluating the LDH media for treatment of cooling tower blowdown water. We find that despite the high levels of total dissolved solids and competing sulfate ions, the selenium oxoanions and other regulated metals such as chromium and arsenic are successfully removed using LDH media without needing any pre-treatment or pH adjustment of the wastewater.",
keywords = "Column test, Cooling tower blowdown, Industrial wastewater treatment, Layered double hydroxide, Selenium, Sorbent",
author = "Man Li and Tanzil Chowdhury and Kraetz, {Andrea N.} and Hangkun Jing and Andrew Dopilka and Farmen, {Lisa M.} and Shahnawaz Sinha and Chan, {Candace K.}",
note = "Funding Information: This research was funded through the Arizona State University/Salt River Project Joint Research Program, under the projects “Pilot Test on Selenium Removal from SRP Waters using Solid Phase Extraction Materials” and “Column Test Studies on Selenium Removal from SRP Waters using Solid Phase Extraction Materials.” Partial support from the National Science Foundation Nanosystems Engineering Research Center for Nanotechnology Enabled Water Treatment (EEC-1449500) is also acknowledged. We would like to thank D. Pelley, F. Fuller, B. Schuster, N. Smith, and L. Bonilla from Salt River Project for their support of this research, for providing water samples, for assistance with the pilot test field study, and for many helpful discussions. We are also grateful to N. Gudovic from Canyon State Filtration for assistance with the pilot test skid design and implementation. We also acknowledge the use of facilities within the Goldwater Environmental Laboratory, Keck Foundation Laboratory for Environmental Biogeochemistry, Goldwater Materials Science Facility, and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment. Funding Information: Funding: This research was funded through the Arizona State University/Salt River Project Joint Research Program, under the projects “Pilot Test on Selenium Removal from SRP Waters using Solid Phase Extraction Materials” and “Column Test Studies on Selenium Removal from SRP Waters using Solid Phase Extraction Materials.” Partial support from the National Science Foundation Nanosystems Engineering Research Center for Nanotechnology Enabled Water Treatment (EEC-1449500) is also acknowledged. Publisher Copyright: {\textcopyright} 2019 by the authors. Licensee MDPI, Basel, Switzerland.",
year = "2019",
month = mar,
doi = "10.3390/chemengineering3010020",
language = "English (US)",
volume = "3",
pages = "1--24",
journal = "ChemEngineering",
issn = "2305-7084",
publisher = "MDPI AG",
number = "1",
}