Electrical resistivity tomography to monitor enhanced biodegradation of hydrocarbons with Rhodococcus erythropolis T902.1 at a pilot scale
| Autor: | Frédéric Nguyen, Serge Hiligsmann, Benoît Lavigne, David Caterina, Thibaut Masy, Olivier Tromme, Philippe Thonart |
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| Rok vydání: | 2016 |
| Předmět: |
Bioaugmentation
010504 meteorology & atmospheric sciences Environmental remediation Soil science 010501 environmental sciences 01 natural sciences Biostimulation Bioremediation Electric Impedance Rhodococcus Soil Pollutants Environmental Chemistry Electrical resistivity tomography Tomography Environmental Restoration and Remediation Soil Microbiology 0105 earth and related environmental sciences Water Science and Technology biology Environmental engineering Biodegradation biology.organism_classification Hydrocarbons Biodegradation Environmental Petroleum Loam Environmental science |
| Zdroj: | Journal of Contaminant Hydrology. 184:1-13 |
| ISSN: | 0169-7722 |
| Popis: | Petroleum hydrocarbons (HC) represent the most widespread contaminants and in-situ bioremediation remains a competitive treatment in terms of cost and environmental concerns. However, the efficiency of such a technique (by biostimulation or bioaugmentation) strongly depends on the environment affected and is still difficult to predict a priori. In order to overcome these uncertainties, Electrical Resistivity Tomography (ERT) appears as a valuable non-invasive tool to detect soil heterogeneities and to monitor biodegradation. The main objective of this study was to isolate an electrical signal linked to an enhanced bacterial activity with ERT, in an aged HC-contaminated clay loam soil. To achieve this, a pilot tank was built to mimic field conditions. Compared to a first insufficient biostimulation phase, bioaugmentation with Rhodococcus erythropolis T902.1 led to a HC depletion of almost 80% (6900 to 1600ppm) in 3months in the center of the contaminated zone, where pollutants were less bioavailable. In the meantime, lithological heterogeneities and microbial activities (growth and biosurfactant production) were successively discriminated by ERT images. In the future, this cost-effective technique should be more and more transferred to the field in order to monitor biodegradation processes and assist in selecting the most appropriate remediation technique. |
| Databáze: | OpenAIRE |
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