TY - JOUR
T1 - Interactions of rice (Oryza sativa L.) and PAH-degrading bacteria (Acinetobacter sp.) on enhanced dissipation of spiked phenanthrene and pyrene in waterlogged soil
AU - Gao, Y.
AU - Yu, X. Z.
AU - Wu, S. C.
AU - Cheung, K. C.
AU - Tam, N. F.Y.
AU - Qian, P. Y.
AU - Wong, M. H.
N1 - Funding Information:
The authors are grateful for the financial support from the Area of Excellence Project (CITYU/AOE/03-04/02); and Group Research Project, Central Allocation (HKBU 1/03C), Research Grants Council of the University Grants Committee of Hong Kong.
PY - 2006/12/15
Y1 - 2006/12/15
N2 - The effects of cultivation of rice (Oryza sativa L.) and PAH-degrading bacteria (Acinetobacter sp.) separately, and in combination, on the dissipation of spiked phenanthrene and pyrene (0, 50 + 50, 100 + 100, 200 + 200 mg kg- 1) in waterlogged soil were studied using pot trials. The population of introduced PAH-degrading bacteria remained at 105 CFU g- 1 dry soil after 20 days of treatment with Acinetobacter sp. only, but increased to 106 when planted with rice simultaneously. Shoot and root biomass of rice when grown alone was adversely affected by spiked PAHs, but significantly increased by 2-55% and 8-409%, respectively, when inoculated with Acinetobacter sp.. Phenanthrene and pyrene concentrations in roots ranged from 1-27 and 20-98 mg kg- 1, respectively, while their concentrations in shoots were generally lower than 0.2 mg kg- 1. The dissipation of phenanthrene was mainly due to abiotic loss as 70-78% phenanthrene was lost from the control soil at the end of 80 days, while removal of 86-87% phenanthrene had been achieved after 40 days in the treatment co-cultivated with Acinetobacter sp. and rice. Compared with the control where only 6-15% of pyrene was removed from soil, a much higher dissipation of pyrene (43-62%) was attained for the treatments co-cultivated with Acinetobacter sp. and rice at the end of 80 days. The results demonstrated that co-cultivation of rice and PAH-degrading bacteria may have a great potential to accelerate the bioremediation process of PAH-contaminated soil under waterlogged conditions.
AB - The effects of cultivation of rice (Oryza sativa L.) and PAH-degrading bacteria (Acinetobacter sp.) separately, and in combination, on the dissipation of spiked phenanthrene and pyrene (0, 50 + 50, 100 + 100, 200 + 200 mg kg- 1) in waterlogged soil were studied using pot trials. The population of introduced PAH-degrading bacteria remained at 105 CFU g- 1 dry soil after 20 days of treatment with Acinetobacter sp. only, but increased to 106 when planted with rice simultaneously. Shoot and root biomass of rice when grown alone was adversely affected by spiked PAHs, but significantly increased by 2-55% and 8-409%, respectively, when inoculated with Acinetobacter sp.. Phenanthrene and pyrene concentrations in roots ranged from 1-27 and 20-98 mg kg- 1, respectively, while their concentrations in shoots were generally lower than 0.2 mg kg- 1. The dissipation of phenanthrene was mainly due to abiotic loss as 70-78% phenanthrene was lost from the control soil at the end of 80 days, while removal of 86-87% phenanthrene had been achieved after 40 days in the treatment co-cultivated with Acinetobacter sp. and rice. Compared with the control where only 6-15% of pyrene was removed from soil, a much higher dissipation of pyrene (43-62%) was attained for the treatments co-cultivated with Acinetobacter sp. and rice at the end of 80 days. The results demonstrated that co-cultivation of rice and PAH-degrading bacteria may have a great potential to accelerate the bioremediation process of PAH-contaminated soil under waterlogged conditions.
KW - Dissipation
KW - PAH-degrading bacteria
KW - Phenanthrene
KW - Pyrene
KW - Rice
KW - Soil
UR - http://www.scopus.com/inward/record.url?scp=33750996406&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2006.09.029
DO - 10.1016/j.scitotenv.2006.09.029
M3 - Article
C2 - 17081596
AN - SCOPUS:33750996406
SN - 0048-9697
VL - 372
SP - 1
EP - 11
JO - Science of the Total Environment
JF - Science of the Total Environment
IS - 1
ER -