Biostimulation of sulfate reduction for in-situ metal(loid) precipitation at an industrial site in Flanders, Belgium.

Autor: Pérez-de-Mora A; TAUW GmbH, Dept. of Soil & Groundwater, Landsbergerstr. 290, 80687 Munich, Germany. Electronic address: alfredo.perezdemora@tauw.com., de Wilde H; TAUW België nv, Dept. of Soil & Groundwater, Waaslandlaan 8A3, 9160 Lokeren, Belgium., Paulus D; TAUW België nv, Dept. of Soil & Groundwater, Remylaan 4C, Bus 3, 3018 Leuven, Belgium., Roosa S; Materia NOVA Institute, 6 Avenue du champ de Mars, 7000 Mons, Belgium., Onderwater R; Materia NOVA Institute, 6 Avenue du champ de Mars, 7000 Mons, Belgium., Paint Y; Materia NOVA Institute, 6 Avenue du champ de Mars, 7000 Mons, Belgium., Avignone Rossa C; University of Surrey, Deptartment of Microbial Sciences, Guildford GU2 7XH, United Kingdom., Farkas D; University of Surrey, Deptartment of Microbial Sciences, Guildford GU2 7XH, United Kingdom. Electronic address: df00080@surrey.ac.uk.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Jun 15; Vol. 929, pp. 172298. Date of Electronic Publication: 2024 Apr 12.
DOI: 10.1016/j.scitotenv.2024.172298
Abstrakt: A 30-month pilot study was conducted to evaluate the potential of in-situ metal(loid) removal through biostimulation of sulfate-reducing processes. The study took place at an industrial site in Flanders, Belgium, known for metal(loid) contamination in soil and groundwater. Biostimulation involved two incorporations of an organic substrate (emulsified vegetable oil) as electron donor and potassium bicarbonate to raise the pH of the groundwater by 1-1.5 units. The study focused on the most impacted permeable fine sand aquifer (8-9 m below groundwater level) confined by layers of non-permeable clay. The fine sands exhibited initially oxic conditions (50-200 mV), an acidic pH of 4.5 and sulfate concentrations ranging from 600 to 800 mg/L. At the central monitoring well, anoxic conditions (-200 to -400 mV) and a pH of 5.9 established shortly after the second substrate and reagent injection. Over the course of 12 months, there was a significant decrease in the concentration of arsenic (from 2500 to 12 μg/L), nickel (from 360 to <2 μg/L), zinc (from 78,000 to <2 μg/L), and sulfate (from 930 to 450 mg/L). Low levels of metal(loid)s were still present after 34 months (end of study). Mineralogical analysis indicated that the precipitates formed were amorphous in nature. Evidence for biologically driven metal(loid) precipitation was provided by compound specific stable isotope analysis of sulfate. In addition, changes in microbial populations were assessed using next-generation sequencing, revealing stimulation of native sulfate-reducing bacteria. These results highlight the potential of biostimulation for long-term in situ metal(loid) plume treatment/containment.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: