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Alternating current enhanced bioremediation of petroleum hydrocarbon-contaminated soils.
- Source :
- Environmental Science & Pollution Research; Sep2021, Vol. 28 Issue 34, p47562-47573, 12p
- Publication Year :
- 2021
-
Abstract
- In this work, bioremediation was applied with sinusoidal alternating current (AC) electric fields to remove petroleum hydrocarbon (TPH) for soil remediation. Applying AC electric field with bioremediation (AC+BIO) could efficiently remove 31.6% of the TPH in 21 days, much faster than that in the BIO only system (13.7%) and AC only system (5.5%). When the operation time extended to 119 days, the AC+BIO system could remove 73.3% of the TPH. Applying AC electric field (20–200 V/m) could maintain the soil pH at neutral, superior to the direct current electric field. The maximum difference between soil temperature and the room temperature was 1.9 °C in the AC (50 V/m) +BIO system. The effects of AC voltage gradient (20–200 V/m) on the microorganisms and TPH degradation efficiency by AC+BIO were investigated, and the optimized AC voltage gradient was assessed as 50 V/m for lab-scale experiments. The microbial community structures in the BIO and AC+BIO systems were compared. Although Pseudomonas was the dominant species, Firmicutes became more abundant in the AC+BIO system than the BIO system, indicating their adaptive capacity to the stress of the AC electric field. Real petroleum-contaminated soil was used as a reaction matrix to evaluate the performance of AC+BIO in the field. The initial current density was about 0.2 mA/cm<superscript>2</superscript>, voltage gradient was about 20 V/m, and the average TPH degradation rate was 8.1 μg/g<subscript>dry soil</subscript> per day. This study provided insights and fundamental supports for the applications of AC+BIO to treat petroleum-polluted soils. [ABSTRACT FROM AUTHOR]
- Subjects :
- ALTERNATING currents
BIOREMEDIATION
ELECTRIC fields
PETROLEUM
SOIL remediation
Subjects
Details
- Language :
- English
- ISSN :
- 09441344
- Volume :
- 28
- Issue :
- 34
- Database :
- Complementary Index
- Journal :
- Environmental Science & Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 152056779
- Full Text :
- https://doi.org/10.1007/s11356-021-13942-2