Effect of wetland plants and bacterial inoculation on dissipation of phenanthrene.
This study attempts to evaluate the capacity of wetland plants' ability to dissipate phenanthrene (PHE) under waterlogged conditions. The results indicate that Typha latifolia and Vetiveria zizanioides may efficiently degrade PHE, and were much more effective when under combined plant cultivation with the inoculation of Pseudomonas frederiksbergensis (ATCC BAA-257) . Concentrations of PHE declined from 200 to less than 52 mg kg-1in all treatments with plant cultivation. At the end of the experimental period, PHE was undetectable in combined plant cultivation in the presence of bacteria inoculation. Microbial biomass C(carbon), N(nitrogen), and P(phosphate) were significantly different (p < 0.05) in the presence and absence of bacteria inoculation with bacteria inoculation significantly (p < 0.05) increased microbial biomass P. The presence of bacteria inoculation and different plant species significantly (p < 0.05) decreased the PHE concentrations in the microcosms. The inoculation of bacteria and release of exudates from plant roots further enhanced the dissipation of PHE in sand. Concentrations of citric and malic acids were decreased up to 69% in bacteria-inoculated treatments, showing large citric and malic acids serving as a food source and growth substrate for bacteria.
a College of Bioscience and Biotechnology, Hunan Agricultural University , Changsha , P.R. China.
Weisong
W
Pan
b School of Metallurgy and Environment, Central South University , Changsha , P.R. China.
Chuan
C
Wu
a College of Bioscience and Biotechnology, Hunan Agricultural University , Changsha , P.R. China.
Qiming
Q
Wang
a College of Bioscience and Biotechnology, Hunan Agricultural University , Changsha , P.R. China.
Zhaohong
Z
Su
a College of Bioscience and Biotechnology, Hunan Agricultural University , Changsha , P.R. China.
Hui
H
Zhou
c Croucher Institute for Environmental Sciences, and Department of Biology , Hong Kong Baptist University , Hong Kong SAR , P.R. China.
Anna King Chuen
AKC
Chung
d Crop and Environment Sciences Department , Harper Adams University , Newport , Shropshire , United Kingdom.
William
W
Hartley
e Sanbio (Beijing) Tech Co., Ltd , Beijing , P.R. China.
Long
L
Ge
D001673:Biodegradation, Environmental; D049930:Chrysopogon; D010616:Phenanthrenes; D018517:Plant Roots; D032401:Typhaceae; D053833:Wetlands
D010616:Phenanthrenes
PAHs; bacteria; phytoremediation