%0 Generic
%A Song, Bingnan
%A Weijma, Jan
%A van der Weijden, Renata
%A Buisman, Cees
%A Tian, Zilin
%D 2021
%T Dataset associated to publication: "High-rate biological selenate reduction in a sequencing batch reactor for recovery of hexagonal selenium"
%U https://data.4tu.nl/articles/dataset/Dataset_associated_to_publication_High-rate_biological_selenate_reduction_in_a_sequencing_batch_reactor_for_recovery_of_hexagonal_selenium_/12927563/2
%R 10.4121/12927563.v2
%K biological selenate reduction
%K ethanol
%K selenium recovery
%K selenite
%K sequencing batch reactor
%X <p></p><p>Results belonging to paper "High-rate biological selenate reduction in a sequencing batch reactor for recovery of hexagonal selenium".</p><p>Recovery of selenium (Se) from
wastewater provides a solution for both securing Se supply and preventing Se
pollution. Here, we developed a high-rate process for biological selenate reduction to elemental
selenium. Distinctive from other studies, we aimed for a process with selenate as
the main biological electron sink, with minimal formation of methane or sulfide.
A sequencing batch reactor, fed with an influent containing 120 mgSe L<sup>-1</sup>
selenate and ethanol as electron donor and carbon source, was operated for 495
days. The high rates (419 ± 17 mgSe L<sup>-1</sup> day<sup>-1</sup>) were
recorded between day 446 and day 495 for a hydraulic retention time of 6h. The maximum
conversion efficiency of selenate amounted to 96% with a volumetric conversion
rate of 444 mgSe L<sup>-1</sup> day<sup>-1</sup>, which is 6 times higher than the
rates reported in the literature thus far. At the end of the experiment, a
highly enriched selenate reducing biomass had developed, with a specific
activity of 856±26 mgSe<sup>-1</sup>day<sup>-1</sup>g<sub>biomass</sub><sup>-1</sup>,
which was nearly 1000-fold higher than that of the inoculum. No evidence was
found for the formation of methane, sulfide, or volatile reduced selenium
compounds like dimethyl-selenide or H<sub>2</sub>Se, revealing a high
selectivity. Ethanol was incompletely oxidized to acetate. The produced
elemental selenium partially accumulated in the reactor as pure (≥80% Se of the
total mixture of biomass sludge flocs and flaky aggregates, and ~100% of the specific
flaky aggregates) selenium
black hexagonal needles, with cluster sizes between 20-200 µm. The new process
may serve as the basis for a high-rate technology to remove and recover pure
selenium from wastewater or process streams with high selectivity.</p><br><p></p>
%I 4TU.ResearchData