Selenium Speciation in Biofilms from Granular Sludge Bed Reactors Used for Wastewater Treatment

Conference · Wed Dec 13 00:00:00 EST 2006 · AIP Conf.Proc.882:229-231,2007

OSTI ID:896409

van Hullenbusch, Eric; Farges, Francois; Lenz, Markus; Lens, Piet; Brown, Jr, Gordon E

Se K-edge XAFS spectra were collected for various model compounds of Se as well as for 3 biofilm samples from bioreactors used for Se-contaminated wastewater treatment. In the biofilm samples, Se is dominantly as Se(0) despite Se K-edge XANES spectroscopy cannot easily distinguish between elemental Se and Se(-I)-bearing selenides. EXAFS spectra indicate that Se is located within aperiodic domains, markedly different to these known in monoclinic red selenium. However, Se can well occur within nanodivided domains related to monoclinic red Se, as this form was optically observed at the rim of some sludges. Aqueous selenate is then efficiently bioreduced, under sulfate reducing and methanogenic conditions.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 896409
• Report Number(s): SLAC-PUB-12225; TRN: US200703%%556
• Journal Information: AIP Conf.Proc.882:229-231,2007, Conference: Prepared for 13th International Conference on X-ray Absorption Fine Structure (XAFS13), Stanford, California, 9-14 Jul 2006
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
ABSORPTION
BIOREACTORS
FINE STRUCTURE
SELENATES
SELENIDES
SELENIUM
SLUDGES
SPECTRA
SPECTROSCOPY
SULFATES
Other
BIO