Open AccessSelenium Speciation in Biofilms from Granular Sludge Bed Reactors Used for Wastewater Treatment
Author(s) -
Eric van Hullenbusch,
François Farges,
Markus Lenz,
Piet N.L. Lens,
Gordon E. Brown
Publication year - 2007
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.2644483
Subject(s) - selenate , xanes , wastewater , selenium , biofilm , materials science , moving bed biofilm reactor , extended x ray absorption fine structure , jarosite , raman spectroscopy , sewage treatment , genetic algorithm , environmental chemistry , spectroscopy , chemistry , absorption spectroscopy , inorganic chemistry , environmental science , environmental engineering , metallurgy , bacteria , geology , paleontology , physics , quantum mechanics , biology , evolutionary biology , optics
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 monoclinc 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.
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