Removal of Bioremediation Residues by Vegetable Oil Extraction and Slurry Phase Biotreatment

摘要

Bioremediation residues in a highly petroleum-contaminated soil were characterized by Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS). Naphthenic acids (O_2 species) dominated the residues. Rapeseed oil was used to extract the residues from the soil. Extraction efficiency was approximately 80% when the oil-soil (v/m) ratio was 2:1. Total mass removal of the residues was more than 90% when the resulting contaminated oil was regenerated by shaking oil-activated carbon mixtures in flasks. The extracted soil containing nonrecoverable oil was bioremediated in aerobic slurry-phase conditions. After 7 weeks of treatment, total extractable organics was reduced from 23,100 to 4,030 mg kg~(-1) soil.