Document Detail


Effectiveness of bacterial inoculum and mangrove plants on remediation of sediment contaminated with polycyclic aromatic hydrocarbons.
MedLine Citation:
PMID:  18374368     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The remediation of mangrove sediment contaminated with mixed polycyclic aromatic hydrocarbons (PAHs) having 3-, 4- and 5-rings by natural attenuation, bioaugmentation, phytoremediation and its combination was compared by greenhouse microcosm studies. At Days 90 and 154, the decreases of PAHs in contaminated mangrove sediment by phytoremediation, planted with one-year old Aegiceras corniculatum, and bioaugmentation, the inoculation of PAH-degrading bacterial strains isolated from mangrove sediment, either SCSH (Mycobacterium parafortuitum) or SAFY (Sphingobium yanoikuyae), were not better than that by natural attenuation (the non-vegetated and un-inoculated microcosms). The populations of SCSH and SAFY in sediment could not be maintained even with repeated inoculation, suggesting that the two isolates were not able to compete with the indigenous microbes and had little enhancement effect. Although some PAHs were accumulated in roots, root uptake only accounted for <15% of the spiked PAHs and the effect of plants on remediation were also insignificant. At the end of the 154-day experiment, the mass balance calculation revealed that the overall losses of PAHs by phytoremediation were comparable to that by bioaugmentation but were lower than that by natural attenuation, especially for the high molecular weight PAHs. Under natural attenuation, around 90% fluorene, 80% phenanthrene, 70% fluoranthene, 68% pyrene and 32% benzo[a]pyrene in contaminated sediment were removed. These results demonstrated that the mangrove sediment itself had sufficient indigenous microorganisms capable of naturally remedying PAH contamination.
Authors:
N F Y Tam; Y S Wong
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-18
Journal Detail:
Title:  Marine pollution bulletin     Volume:  57     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2008  
Date Detail:
Created Date:  2008-06-16     Completed Date:  2008-10-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  716-26     Citation Subset:  IM    
Affiliation:
Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. bhntam@cityu.edu.hk
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MeSH Terms
Descriptor/Qualifier:
Biodegradation, Environmental
Biomass
Geologic Sediments / analysis*,  microbiology*
Mycobacterium / metabolism*,  physiology
Myrsinaceae / growth & development,  metabolism*
Plant Leaves / physiology
Plant Roots / chemistry,  physiology
Plant Stems / physiology
Polycyclic Hydrocarbons, Aromatic / analysis,  chemistry,  metabolism*
Population Density
Sphingomonadaceae / metabolism*,  physiology
Water Pollutants, Chemical / analysis,  chemistry,  metabolism*
Chemical
Reg. No./Substance:
0/Polycyclic Hydrocarbons, Aromatic; 0/Water Pollutants, Chemical

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