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Sand amendment enhances bioelectrochemical remediation of petroleum hydrocarbon contaminated soil
- Source :
- Chemosphere. 141:62-70
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Bioelectrochemical system is an emerging technology for the remediation of soils contaminated by petroleum hydrocarbons. However, performance of such systems can be limited by the inefficient mass transport in soil. Here we report a new method of sand amendment, which significantly increases both oxygen and proton transports, resulting to increased soil porosity (from 44.5% to 51.3%), decreased Ohmic resistance (by 46%), and increased charge output (from 2.5 to 3.5Cg(-1)soil). The degradation rates of petroleum hydrocarbons increased by up to 268% in 135d. The degradation of n-alkanes and polycyclic aromatic hydrocarbons with high molecular weight was accelerated, and denaturing gradient gel electrophoresis showed that the microbial community close to the air-cathode was substantially stimulated by the induced current, especially the hydrocarbon degrading bacteria Alcanivorax. The bioelectrochemical stimulation imposed a selective pressure on the microbial community of anodes, including that far from the cathode. These results suggested that sand amendment can be an effective approach for soil conditioning that will enhances the bioelectrochemical removal of hydrocarbons in contaminated soils.
- Subjects :
- Environmental Engineering
Environmental remediation
Health, Toxicology and Mutagenesis
Amendment
Alcanivoraceae
complex mixtures
Soil
Soil Pollutants
Environmental Chemistry
Polycyclic Aromatic Hydrocarbons
Electrodes
Soil Microbiology
chemistry.chemical_classification
biology
Denaturing Gradient Gel Electrophoresis
Chemistry
Public Health, Environmental and Occupational Health
Electrochemical Techniques
General Medicine
General Chemistry
Silicon Dioxide
biology.organism_classification
Pollution
Soil contamination
Biodegradation, Environmental
Petroleum
Hydrocarbon
Environmental chemistry
Soil water
Alcanivorax
Soil microbiology
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....159a9202cdfd46375ce124c0217d8c73