Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters
| Autor: | Hangkun Jing, Tanzil Chowdhury, Candace K. Chan, Andrew Dopilka, Lisa M. Farmen, Shahnawaz Sinha, Man Li, Andrea N. Kraetz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
General Chemical Engineering
chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Selenate column test Industrial wastewater treatment lcsh:Chemistry chemistry.chemical_compound Sulfate selenium Arsenic 0105 earth and related environmental sciences General Engineering Sorption sorbent 021001 nanoscience & nanotechnology cooling tower blowdown General Energy chemistry Wastewater lcsh:QD1-999 Environmental chemistry Layered double hydroxide Hydroxide 0210 nano-technology Selenium industrial wastewater treatment |
| Zdroj: | ChemEngineering, Vol 3, Iss 1, p 20 (2019) ChemEngineering Volume 3 Issue 1 |
| ISSN: | 2305-7084 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|