Immobilisation of Molybdenum in a Sulphate-Reducing Bioreactor
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Published:2023-12-25
Issue:1
Volume:11
Page:9
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ISSN:2297-8739
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Container-title:Separations
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language:en
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Short-container-title:Separations
Author:
Kousi Pavlina1ORCID, Strongyli Dimitra-Artemis1, Tsakiridis Petros E.1ORCID, Hatzikioseyian Artin1, Remoundaki Emmanouella1ORCID
Affiliation:
1. School of Mining and Metallurgical Engineering, National Technical University of Athens, Zografou Campus, 9, Iroon Polytechniou St., 15772 Zografou, Greece
Abstract
This work presents a biological remediation process for molybdenum-bearing wastewater which may lead to the fabrication of biogenic Mo chalcogenide particles with (photo)catalytic properties. The process is based on dissimilatory sulphate reduction, utilising sulphate-reducing bacteria (SRB), and reductive precipitation of molybdate which is the predominant species of molybdenum in oxygenated water/wastewater. The SRB culture was established in a biofilm reactor which was fed with synthetic solutions containing sulphate (17.7 mM), molybdate molybdenum (2 mM), divalent iron (1.7 mM) and ethanol as the carbon/electron donor. The performance of the bioreactor was monitored in terms of pH, sulphate and molybdenum (Mo(VI) and total) content. The presence of thiomolybdate species was studied by scanning UV-Vis absorbance of samples from the reactor outflow while the reactor precipitates were studied via electron microscopy coupled with energy dispersive spectrometry, X-ray diffractometry and laser light scattering. A molar molybdate/sulphate ratio of 1:12.5 proved effective for molybdate reduction and recovery by 76% in 96 h, whereas sulphate was reduced by 57%. Molybdenum was immobilised in the sulphidic precipitates of the bioreactor, presumably via two principal mechanisms: (i) microbially mediated reduction and precipitation, and (ii) thiomolybdate formation and sorption/incorporation into iron sulphides.
Subject
Filtration and Separation,Analytical Chemistry
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