Abstract
Industrial activities including mining, metal and petrol refining, coal-fired power generation, and intensive agriculture may generate wastes and effluents loaded with selenium (Se). Currently, even if Se discharge is strictly regulated in North America, the large volumes of selenium-laden effluents produced represent a critical problem for both industry and environmental agencies. Numerous treatment technologies for Se removal based on physical and chemical processes have been tested at bench scale, pilot scale, and full scale, and several are commercially available. Physical treatment (e.g., membrane filtration and evaporative systems) can be effective in bringing the Se levels below the discharge standards, but it entails prohibitive operational costs due to high-energy consumption. Adsorption is a less financially demanding alternative treatment option; however, the competition with other anions present in real industrial effluents severely limits the Se removal performance. Chemical treatment has been tested for selenium removal, being mainly founded on the redox change of this element. Various reducing agents (e.g., zero-valent iron and sodium dithionite) have been tested mostly for synthetic wastewaters. pH plays a critical role in the effectiveness of the chemical treatment and, similarly to adsorption, the competition with other anions limits its performance. Several studies have coupled physical and chemical treatment systems in order to attain higher Se removal efficiencies. Residual products of Se treatment are generated by all physical–chemical treatment systems, incurring additional treatment and disposal costs.
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Abbreviations
- AA:
-
Activated alumina
- BDAT:
-
Best demonstrated available technology
- COD:
-
Chemical oxygen demand
- DO:
-
Dissolved oxygen
- EC:
-
Electrocoagulation
- EES:
-
Enhanced evaporation system
- EP:
-
Evaporation
- EPRI:
-
Electric Power Research Institute
- Fe0 :
-
Elemental (zero-valent) iron
- Fh:
-
Ferrihydrite
- FGD:
-
Flue gas desulfurization
- GAC:
-
Granular activated carbon
- HRT:
-
Hydraulic residence time
- IEA:
-
International Energy Agency
- NAMC:
-
North American Metal Council
- NF:
-
Nanofiltration
- NSMP:
-
Nitrogen and selenium management program
- nZVI:
-
Nanoscale zero-valent iron
- ORP:
-
Oxido-reduction potential
- pHPZC :
-
Point of zero charge
- RO:
-
Reverse osmosis
- SSW:
-
Stripped sour water
- Se:
-
Selenium
- Se0 :
-
Elemental (zero-valent) selenium
- SeOx :
-
Selenium oxyanions (selenite and selenate)
- TCLP:
-
Toxicity characteristic leaching procedure
- TDS:
-
Total dissolved solids
- TOC:
-
Total organic carbon
- TSS:
-
Total suspended solids
- USBR:
-
United States Bureau of Reclamation
- USEPA:
-
United Stated Environmental Protection Agency
- ZLD:
-
Zero liquid discharge
- ZVI:
-
Zero-valent iron
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Acknowledgements
The authors would like to thank the European Commission for providing financial support through the Erasmus Mundus Joint Doctorate Programme ETeCoS3 (Environmental Technologies for Contaminated Solids, Soils, and Sediments) under the grant agreement FPA n°2010-0009. We are grateful to Prof. Larry Twidwell (Montana Tech, USA) and Dr. Dennis Lemly (USDA Forest Service Southern Research Station, USA) for their useful comments on the manuscript.
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Staicu, L.C., van Hullebusch, E.D., Lens, P.N. (2017). Industrial Selenium Pollution: Wastewaters and Physical–Chemical Treatment Technologies . In: van Hullebusch, E. (eds) Bioremediation of Selenium Contaminated Wastewater. Springer, Cham. https://doi.org/10.1007/978-3-319-57831-6_5
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