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Article

Biotic and Abiotic Biostimulation for the Reduction of Hexavalent Chromium in Contaminated Aquifers

Sanitary Engineering Laboratory, Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, Iroon Polytechniou 9, Zografou, 157 80 Athens, Greece
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Academic Editor: Domenico Cicchella
Water 2022, 14(1), 89; https://doi.org/10.3390/w14010089
Received: 26 October 2021 / Revised: 9 December 2021 / Accepted: 30 December 2021 / Published: 4 January 2022
(This article belongs to the Section Water Quality and Contamination)
Hexavalent chromium is a carcinogenic heavy metal that needs to be removed effectively from polluted aquifers in order to protect public health and the environment. This work aims to evaluate the reduction of Cr(VI) to Cr(III) in a contaminated aquifer through the stimulation of indigenous microbial communities with the addition of reductive agents. Soil-column experiments were conducted in the absence of oxygen and at hexavalent chromium (Cr(VI)) groundwater concentrations in the 1000–2000 μg/L range. Two carbon sources (molasses and EVO) and one iron electron donor (FeSO4·7H2O) were used as ways to stimulate the metabolism and proliferation of Cr(VI) reducing bacteria in-situ. The obtained results indicate that microbial anaerobic respiration and electron transfer can be fundamental to alleviate polluted groundwater from hazardous Cr(VI). The addition of organic electron donors increased significantly Cr(VI) reduction rates in comparison to natural soil attenuation rates. Furthermore, a combination of organic carbon and iron electron donors led to a longer life span of the remediation process and thus increased total Cr(VI) removal. This is the first study to investigate biotic and abiotic Cr(VI) removal by conducting experiments with natural soil and by applying biostimulation to modify the natural existing microbial communities. View Full-Text
Keywords: hexavalent chromium; anaerobic chromium reduction; biostimulation; organic and inorganic electron donors hexavalent chromium; anaerobic chromium reduction; biostimulation; organic and inorganic electron donors
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MDPI and ACS Style

Galani, A.; Mamais, D.; Noutsopoulos, C.; Anastopoulou, P.; Varouxaki, A. Biotic and Abiotic Biostimulation for the Reduction of Hexavalent Chromium in Contaminated Aquifers. Water 2022, 14, 89. https://doi.org/10.3390/w14010089

AMA Style

Galani A, Mamais D, Noutsopoulos C, Anastopoulou P, Varouxaki A. Biotic and Abiotic Biostimulation for the Reduction of Hexavalent Chromium in Contaminated Aquifers. Water. 2022; 14(1):89. https://doi.org/10.3390/w14010089

Chicago/Turabian Style

Galani, Andriani, Daniel Mamais, Constantinos Noutsopoulos, Petra Anastopoulou, and Alexia Varouxaki. 2022. "Biotic and Abiotic Biostimulation for the Reduction of Hexavalent Chromium in Contaminated Aquifers" Water 14, no. 1: 89. https://doi.org/10.3390/w14010089

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