Enhancing pyrene mineralization in contaminated soil by the addition of humic acids or composted contaminated soil.
The addition of composted PAH-contaminated soil to PAH-contaminated soil spiked with 14C-labeled pyrene resulted in rapid mineralization of pyrene (more than 57% after 21 days compared with 3.4% in un-amended soil). The addition of the humic acid fraction of the composted soil also increased the mineralization potential of the soil significantly, but to a lesser extent (37.5% mineralization after 106 days compared with 20.6% in unamended soil). Increasing the humic acid concentration increased mineralization up to a maximum of more than three times the unamended rate, after which the rate of pyrene mineralization decreased, possibly due to inhibitory pH or concentrations of salts. The amendment of PAH-contaminated soil with materials containing humic acids or humic acid extracts is suggested as a method of bioremediation.
Haderlein
A
A
Department of Chemical Engineering, Ecole Polytechnique de Montréal, Succursale Centre-Ville, Quebec, Canada.
Legros
R
R
Ramsay
B
B
D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006812:Humic Substances / Q000032:analysis / Q000378:metabolism*; D011721:Pyrenes / Q000378:metabolism*; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*
D006812:Humic Substances; D011721:Pyrenes; D012987:Soil; D012989:Soil Pollutants