TY - JOUR
T1 - A field trial for an ex-situ bioremediation of a drilling mud-polluted site
AU - Rojas-Avelizapa, N. G.
AU - Roldán-Carrillo, T.
AU - Zegarra-Martínez, H.
AU - Muñoz-Colunga, A. M.
AU - Fernández-Linares, L. C.
N1 - Funding Information:
The authors thank the many people who assisted in the field experiments helping to construct and maintain the biopiles at Paredon 31. This research was supported by the Grant D.00023 Atenuación Natural de Suelos Contaminados financed by the Mexican Institute of Petroleum.
PY - 2007/1
Y1 - 2007/1
N2 - The remediation of drilling mud-polluted sites in the Southeast of Mexico is a top priority for Mexican oil industry. The objective of this work was to find a technology to remediate these sites. A field trial was performed by composting in biopiles, where four 1 ton soil-biopiles were established, one treatment in triplicate and one unamended biopile. Amended biopiles were added with nutrients to get a C/N/P ratio of 100/3/0.5 plus a bulking agent (straw) at a soil/straw ratio of 97/3. Moisture content was maintained around 30-35%. Results showed that, after 180 d, total petroleum hydrocarbon (TPH) concentrations decreased from 99 300 ± 23 000 mg TPH kg-1 soil to 5500 ± 770 mg TPH kg-1 for amended biopiles and to 22 900 ± 7800 mg TPH kg-1 for unamended biopile. An undisturbed soil control showed no change in TPH concentrations. Gas chromatographic analysis showed residual alkyl dibenzothiophene type compounds. Highest bacterial counts were observed during the first 30 d which correlated with highest TPH removal, whereas fungal count increased at the end of the experimentation period. Results suggested an important role of the straw, nutrient addition and water content in stimulating aerobic microbial activity and thus hydrocarbon removal. This finding opens an opportunity to remediate old polluted sites with recalcitrant and high TPH concentration.
AB - The remediation of drilling mud-polluted sites in the Southeast of Mexico is a top priority for Mexican oil industry. The objective of this work was to find a technology to remediate these sites. A field trial was performed by composting in biopiles, where four 1 ton soil-biopiles were established, one treatment in triplicate and one unamended biopile. Amended biopiles were added with nutrients to get a C/N/P ratio of 100/3/0.5 plus a bulking agent (straw) at a soil/straw ratio of 97/3. Moisture content was maintained around 30-35%. Results showed that, after 180 d, total petroleum hydrocarbon (TPH) concentrations decreased from 99 300 ± 23 000 mg TPH kg-1 soil to 5500 ± 770 mg TPH kg-1 for amended biopiles and to 22 900 ± 7800 mg TPH kg-1 for unamended biopile. An undisturbed soil control showed no change in TPH concentrations. Gas chromatographic analysis showed residual alkyl dibenzothiophene type compounds. Highest bacterial counts were observed during the first 30 d which correlated with highest TPH removal, whereas fungal count increased at the end of the experimentation period. Results suggested an important role of the straw, nutrient addition and water content in stimulating aerobic microbial activity and thus hydrocarbon removal. This finding opens an opportunity to remediate old polluted sites with recalcitrant and high TPH concentration.
KW - Heterothrophic
KW - Hydrocarbon-degrading bacteria
KW - Removal
KW - Straw
KW - Total petroleum hydrocarbons
UR - http://www.scopus.com/inward/record.url?scp=33845447278&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2006.08.011
DO - 10.1016/j.chemosphere.2006.08.011
M3 - Artículo
C2 - 16997351
SN - 0045-6535
VL - 66
SP - 1595
EP - 1600
JO - Chemosphere
JF - Chemosphere
IS - 9
ER -