Biodegradation of high-molecular-weight polycyclic aromatic hydrocarbons under anaerobic conditions: Overview of studies, proposed pathways and future perspectives

The biodegradation of low- and high-molecular-weight polycyclic aromatic hydrocarbons (PAHs) (LWM-PAHs and HMW-PAHs, respectively) has been studied extensively under aerobic conditions. Molecular O2 plays 2 critical roles in this biodegradation process. O2 activates the aromatic rings through hydrox...

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Vydáno v:Environmental pollution (1987) Ročník 239; s. 788 - 802
Hlavní autor: Nzila, Alexis
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Elsevier Ltd 01.08.2018
Témata:
aerobic conditions
Anaerobic
anaerobic conditions
Anaerobiosis
bacteria
Bacteria, Anaerobic - drug effects
Biodegradation
Biodegradation, Environmental
Bioreactors - microbiology
Denitrification
Environmental Pollutants - analysis
hydroxylation
Methanogens
Microbial Consortia - drug effects
Molecular Weight
naphthalene
Nitrate-reducing bacteria
oxygen
Polycyclic Aromatic Hydrocarbons - analysis
Polycyclic-aromatic-hydrocarbons
Sulfate-reducing bacteria
Biodegradation
Nitrate-reducing bacteria
Polycyclic-aromatic-hydrocarbons
Sulfate-reducing bacteria
Methanogens
Anaerobic
ISSN:0269-7491, 1873-6424, 1873-6424
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Shrnutí:The biodegradation of low- and high-molecular-weight polycyclic aromatic hydrocarbons (PAHs) (LWM-PAHs and HMW-PAHs, respectively) has been studied extensively under aerobic conditions. Molecular O2 plays 2 critical roles in this biodegradation process. O2 activates the aromatic rings through hydroxylation prior to ring opening and serves as a terminal electron acceptor (TEA). However, several microorganisms have devised ways of activating aromatic rings, leading to ring opening (and thus biodegradation) when TEAs other than O2 are used (under anoxic conditions). These microorganisms belong to the sulfate-, nitrate-, and metal-ion-reducing bacteria and the methanogens. Although the anaerobic biodegradation of monocyclic aromatic hydrocarbons and LWM-PAH naphthalene have been studied, little information is available about the biodegradation of HMW-PAHs. This manuscript reviews studies of the anaerobic biodegradation of HMW-PAHs and identifies gaps that limit both our understanding and the efficiency of this biodegradation process. Strategies that can be employed to overcome these limitations are also discussed. [Display omitted] •Complex polycyclic aromatic hydrocarbons can be biodegraded anaerobically.•Sulfate-, nitrate-bacteria and methanogens can carry out this biodegradation.•The stability of these compounds makes them less amenable to anaerobic degradation.•Microorganism consortia, bioaugmentation, cometabolism increase biodegradation.•Nanotechnology and new design bioreactors will improve this biodegradation.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0269-7491
1873-6424
1873-6424
DOI:10.1016/j.envpol.2018.04.074