Industrial Selenium Pollution: Sources and Biological Treatment Technologies
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Abstract
Selenium (Se) discharge into the environment is becoming a matter of increasing concern because it induces toxic effects to biota at low concentrations (several micrograms per liter). Industrial activities that include energy generation, metal and oil refining, mining, and agriculture irrigation generate effluents contaminated with selenium. Biological treatment of these effluents is gaining in popularity in recent years. Microbial reduction of selenium oxyanions to particulate elemental Se0 can be achieved in a number of bioreactor systems that are emerging as a viable bioremediation option because of their favorable cost, footprint, and treatment efficiency. Traditionally, granular sludge bioreactors (e.g., upflow anaerobic sludge blanket, UASB) have been tested for the treatment of selenium-laden wastewaters. Fluidized-bed bioreactors (FBBR) and packed-bed bioreactor systems were later adapted for Se treatment. The hydrogen-based hollow-fiber membrane biofilm reactor (MBfR) is a technology that delivers H2 gas as the electron donor by diffusion to the biofilm formed on non-porous hollow-fiber membranes. A hybrid electro-biochemical reactor (EBR) which uses electrons that are delivered from an external power source through electrodes to selenium-reducing bacteria growing on electrodes has been developed. Constructed wetlands may be useful when the wastewater is produced in large volumes, but they are sensitive to temperature fluctuations and seasonal variation of the vegetation, and they have a large footprint. If Se0 colloids are not captured efficiently within the bioreactor, a challenge is removing colloidal Se0 from the effluent. When properly recovered, Se0 can be a valuable product due to its photo-optical, semiconductive, and adsorptive properties.
Keywords
Selenium Wastewater Biotreatment Bioremediation ToxicityList of abbreviations
- ABMet®
Advanced biological metals removal
- BOD
Biochemical oxygen demand
- COD
Chemical oxygen demand
- DIET
Direct interspecies electron transfer
- DO
Dissolved oxygen
- EBCT
Empty bed contact time
- EBR
Electro-biochemical reactor
- FGD
Flue gas desulfurization
- FBBR
Fluidized-bed biofilm reactor
- GAC
Granular activated carbon
- HRT
Hydraulic residence time
- MBfR
Membrane biofilm reactor
- NAMC
North American Metal Council
- ORP
Oxido-reduction potential
- Se
Selenium
- Se0
Elemental (zero-valent) selenium
- SeOx
Selenium oxyanions (selenite and selenate)
- TDS
Total dissolved solids
- TOC
Total organic carbon
- TSS
Total suspended solids
- UASB
Upflow anaerobic sludge blanket
- USEPA
United States Environmental Protection Agency
- WHO
World Health Organization
Notes
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 no. 2010-0009. We are grateful to Dr. Joel Citulski and Nelson Fonseca (General Electric Power, Oakville, ON, Canada), Dr. Jack Adams (Inotec, Salt Lake City, UT, USA), Dr. Todd Webster (Envirogen Technologies, Inc., East Windsor, NJ, USA), and Dr. Harry Ohlendorf (CH2 M Hill, Englewood, CO, USA) for their useful comments on the manuscript.
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