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Complex Interactions Between the Macrophyte Acorus Calamus and Microbial Fuel Cells During Pyrene and BenzoaPyrene Degradation in Sediments
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Complex Interactions Between the Macrophyte Acorus Calamus and Microbial Fuel Cells During Pyrene and BenzoaPyrene Degradation in Sediments
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Journal Article
Complex Interactions Between the Macrophyte Acorus Calamus and Microbial Fuel Cells During Pyrene and BenzoaPyrene Degradation in Sediments
2015
Overview
This study investigated the interaction of the macrophyte
Acorus calamus
and sediment microbial fuel cells (SMFC) during the degradation of high molecular weight-polycyclic aromatic hydrocarbons (HMW-PAHs) in sediments. Over 367-days, the combination of macrophyte and SMFC led to an increase in pyrene and benzo[
a
]pyrene degradation rates by at least 70% compared to SMFC or macrophyte alone. While either the macrophyte or SMFC increased redox potential in sediments, redox potentials near the anode (approximately 6 cm depth) in the macrophyte-SMFC combination were markedly lower than that in the only macrophyte treatment. Moreover, rhizospheric bacterial communities in macrophyte-SMFC and macrophyte treatments were distinctly different. Aerobic genera (
Vogesella
,
Pseudomonas
,
Flavobacterium
and
Rhizobium)
and anaerobic genera (
Longilinea
,
Bellilinea
,
Desulfobacca
and
Anaeromyxobacter
) became dominant in the rhizosphere in macrophyte and macrophyte-SMFC treatments, respectively. In addition, the macrophyte-SMFC combination improved the numbers of not only aerobic but anaerobic PAHs degraders in sediments. So, the SMFC employment facilitated the formation of anoxic zones in sediments with oxygen loss and exudates from the roots. As a result, cooperation of anaerobic/aerobic microbial metabolism for accelerating HMW-PAHs removal occurred within sediments after combining macrophytes with SMFC.
Publisher
Nature Publishing Group UK,Nature Publishing Group
