Effect of organic wastes on the plant-microbe remediation for removal of aged PAHs in soils

The effectiveness of in-situ bioremediation of polycyclic aromatic hydrocarbons （PAHs） may be inhibited by low nutrients and organic carbon. To evaluate the effect of organic wastes on the PAHs removal efficiency of a plant-microbe remediation system, contaminated agricultural soils were amended wit...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2012-08, Vol.24 (8), p.1476-1482
Main Authors: Zhang, Jing, Lin, Xiangui, Liu, Weiwei, Wang, Yiming, Zeng, Jun, Chen, Hong
Format: Article
Language:English
Subjects:
agricultural soils
alfalfa
Animals
Bacillus
Bacillus (bacteria)
Biodegradation, Environmental
Biomass
bioremediation
carbon
Cattle
cattle manure
dissolved organic matter
Flavobacterium
Manure
Medicago sativa
nutrients
organic wastes
Oxidoreductases - metabolism
PAHs
plant growth
polycyclic aromatic hydrocarbons
polycyclic aromatic hydrocarbons (PAHs)
Polycyclic Aromatic Hydrocarbons - metabolism
Sewage
sewage sludge
shoots
soil amendments
soil contamination
Soil Microbiology
soil microorganisms
Soil Pollutants - metabolism
soil treatment
农业土壤
多环芳烃
微生物修复
有机废物
植物生长
紫花苜蓿
老年
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Summary:The effectiveness of in-situ bioremediation of polycyclic aromatic hydrocarbons （PAHs） may be inhibited by low nutrients and organic carbon. To evaluate the effect of organic wastes on the PAHs removal efficiency of a plant-microbe remediation system, contaminated agricultural soils were amended with different dosages of sewage sludge （SS） and cattle manure （CM） in the presence of alfalfa （Medicago sativa L.） and PAHs-degraders （Bacillus sp. and Flavobacterium sp.）. The results indicated that the alfalfa mean biomasses varied from 0.56 to 2.23 g/pot in root dry weight and from 1.80 to 4.88 g/pot in shoot dry weight. Low dose amendments, with rates of SS at 0.1% and CM at 1%, had prominent effects on plant growth and soil PAHs degradation. After 60-day incubation, compared with about 5.6% in the control, 25.8% PAHs removal was observed for treatments in the presence of alfalfa and PAHs-degraders; furthermore, when amended with different dosages of SS and CM, the removed PAHs from soils increased by 35.5%--44.9% and 25.5%-42.3%, respectively. In particular, the degradation of high-molecular-weight PAHs was up to 42.4%. Dehydrogenase activities （DH） ranged between 0.41 and 1.83 ~tg triphenylformazan/（g dry soil.hr） and the numbers of PAHs-degrading microbes （PDM） ranged from 1.14x106 to 16.6x106 most-probable-number/g dry soil. Further investigation of the underlying microbial mechanism revealed that both DH and PDM were stimulated by the addition of organic wastes and significantly correlated with the removal ratio of PAHs. In conclusion, the effect of organic waste application on soil PAHs removal to a great extent is dependent on the interactional effect of nutrients and dissolved organic matter in organic waste and soil microorganisms.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(11)60951-0