TY - JOUR
T1 - Enhancement of hydrocarbon removal in a clay and drilling-waste polluted soil
AU - Rojas-Avelizapa, N.
AU - Roldán-Carrillo, T.
AU - Arce-Ortega, J.
AU - Ramírez-Islas, M.
AU - Zegarra-Martínez, H.
AU - Fernández-Linares, L.
N1 - Funding Information:
The authors thank Salvador Villa for technical assistance. This work was supported by Grant “Atenuación Natural de Suelos Contaminados” from Instituto Mexicano del Petróleo.
PY - 2006/8/1
Y1 - 2006/8/1
N2 - The application of biological processes in restoring oil polluted sites is growing due to their efficiency in removing different classes of pollutants. The aim of this study was to determine the ability of microorganisms present in a drilling-waste polluted soil (36,200 mg TPH kg-1 soil) to remove weathered hydrocarbons under stimulated and non-stimulated soil conditions. The hypothesis under study was whether petroleum hydrocarbons removal could be enhanced by manipulating C/N ratio, water content and addition of three agroindustrial wastes. A Box-Behnken design was employed to evaluate the effect of each variable. Results demonstrated that, for orange peels and banana trunk treatments, the variable with the largest effect (p < 0.01) on hydrocarbon removal was the C/N ratio, indicating that higher ratio (100/3) improved removal (79.5-82%). The largest effect (p < 0.001) on hydrocarbon removal for pineapple wastes was observed with higher water content (60%) achieving the highest removal (89%). After 90 days of experimentation, the type of agricultural waste and the agricultural waste/soil ratio were not statistically significant in any treatment. However, their addition was important relative to non-stimulated soil, which showed a hydrocarbon removal of 17%. Data reported in this study showed the application of bioremediation in clay and drilling waste-polluted soils.
AB - The application of biological processes in restoring oil polluted sites is growing due to their efficiency in removing different classes of pollutants. The aim of this study was to determine the ability of microorganisms present in a drilling-waste polluted soil (36,200 mg TPH kg-1 soil) to remove weathered hydrocarbons under stimulated and non-stimulated soil conditions. The hypothesis under study was whether petroleum hydrocarbons removal could be enhanced by manipulating C/N ratio, water content and addition of three agroindustrial wastes. A Box-Behnken design was employed to evaluate the effect of each variable. Results demonstrated that, for orange peels and banana trunk treatments, the variable with the largest effect (p < 0.01) on hydrocarbon removal was the C/N ratio, indicating that higher ratio (100/3) improved removal (79.5-82%). The largest effect (p < 0.001) on hydrocarbon removal for pineapple wastes was observed with higher water content (60%) achieving the highest removal (89%). After 90 days of experimentation, the type of agricultural waste and the agricultural waste/soil ratio were not statistically significant in any treatment. However, their addition was important relative to non-stimulated soil, which showed a hydrocarbon removal of 17%. Data reported in this study showed the application of bioremediation in clay and drilling waste-polluted soils.
KW - Box-Behnken
KW - Experimental design
KW - Organic amendments
KW - TPH
UR - http://www.scopus.com/inward/record.url?scp=33745533516&partnerID=8YFLogxK
U2 - 10.1080/15320380600751777
DO - 10.1080/15320380600751777
M3 - Artículo
SN - 1532-0383
VL - 15
SP - 417
EP - 428
JO - Soil and Sediment Contamination
JF - Soil and Sediment Contamination
IS - 4
ER -