Assessing the influence of the carbon oxidation-reduction state on organic pollutant biodegradation in algal–bacterial photobioreactors

Bahr, Melanie; Stams, A.J.M.; Rosa, F. de la; García‐Encina, Pedro A.; Muñoz, Raúl

doi:10.1007/s00253-011-3204-8

Cited by 21 publications

(11 citation statements)

References 15 publications

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“…(4), (5), and (6) suggest that there is an imbalance between O 2 and CO 2 in the algal-bacterial system for complete BPA biodegradation. These results concur with previous studies, which Table 1 found that higher levels of O 2 were required in the algalbacterial system for complete biodegradation of more reduced pollutants such as methane and methanol compared with glucose (Bahr et al 2011). For this reason, some researchers suggest that an external O 2 or CO 2 supply is necessary in an algal-bacterial system for recalcitrant pollutant removal (Bordel et al 2009;Bahr et al 2011).…”

Section: Carbon Mass Balancesupporting

confidence: 92%

Biodegradation of bisphenol A by an algal-bacterial system

Eio

Kawai

Niwa

et al. 2015

Environ Sci Pollut Res

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The degradation of bisphenol A (BPA) by Chlorella sorokiniana and BPA-degrading bacteria was investigated. The results show that BPA was partially removed by a monoculture of C. sorokiniana, but the remaining BPA accounted for 50.2, 56.1, and 60.5 % of the initial BPA concentrations of 10, 20, and 50 mg L(-1), respectively. The total algal BPA adsorption and accumulation were less than 1 %. C. sorokiniana-bacterial system effectively removed BPA with photosynthetic oxygen provided by the algae irrespective of the initial BPA concentration. The growth of C. sorokiniana in the algal system was inhibited by BPA concentrations of 20 and 50 mg L(-1), but not in the algal-bacterial system. This observation indicates that bacterial growth in the algal-bacterial system reduced the BPA-inhibiting effect on algae. A total of ten BPA biodegradation intermediates were identified by GC-MS. The concentrations of the biodegradation intermediates decreased to a low level at the end of the experiment. The hypothetical carbon mass balance analysis showed that the amounts of oxygen demanded by the bacteria are insufficient for effective BPA degradation. However, adding an external carbon source could compensate for the oxygen shortage. This study demonstrates that the algal-bacterial system has the potential to remove BPA and its biodegradation intermediates.

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Section: Carbon Mass Balancesupporting

confidence: 92%

Biodegradation of bisphenol A by an algal-bacterial system

Eio

Kawai

Niwa

et al. 2015

Environ Sci Pollut Res

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“…To the best of our knowledge, this is the first time that a coupling of these processes has been directly shown for a natural anoxic environments. Interestingly, microbial consortia of photosynthetic algae and MOB are employed in oxygen-deficient wastewater treatment plants to remove methane (Bahr et al, 2011;van der Ha et al, 2011van der Ha et al, , 2012. In the environment, this mechanism might occur in permanently and seasonally stratified lakes as well as marine basins such as the Black Sea, where light penetrates to the anoxic chemocline.…”

Section: Resultsmentioning

confidence: 99%

Methane oxidation coupled to oxygenic photosynthesis in anoxic waters

et al. 2015

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Freshwater lakes represent large methane sources that, in contrast to the Ocean, significantly contribute to non-anthropogenic methane emissions to the atmosphere. Particularly mixed lakes are major methane emitters, while permanently and seasonally stratified lakes with anoxic bottom waters are often characterized by strongly reduced methane emissions. The causes for this reduced methane flux from anoxic lake waters are not fully understood. Here we identified the microorganisms and processes responsible for the near complete consumption of methane in the anoxic waters of a permanently stratified lake, Lago di Cadagno. Interestingly, known anaerobic methanotrophs could not be detected in these waters. Instead, we found abundant gamma-proteobacterial aerobic methane-oxidizing bacteria active in the anoxic waters. In vitro incubations revealed that, among all the tested potential electron acceptors, only the addition of oxygen enhanced the rates of methane oxidation. An equally pronounced stimulation was also observed when the anoxic water samples were incubated in the light. Our combined results from molecular, biogeochemical and single-cell analyses indicate that methane removal at the anoxic chemocline of Lago di Cadagno is due to true aerobic oxidation of methane fuelled by in situ oxygen production by photosynthetic algae. A similar mechanism could be active in seasonally stratified lakes and marine basins such as the Black Sea, where light penetrates to the anoxic chemocline. Given the widespread occurrence of seasonally stratified anoxic lakes, aerobic methane oxidation coupled to oxygenic photosynthesis might have an important but so far neglected role in methane emissions from lakes.

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“…The sequence of organic carbon degradation and assimilation by microorganisms is an important, but unresolved question in understanding and predicting microbial activities in soils and sediments (Bahr et al, 2011). Free energy, molecular structure, and redox state of organic compounds have been proposed as major factors governing the sequence of their utilization (Bahr et al, 2011). Glucose, lactate and acetate have different free energies and molecular structure, and are the most commonly employed OC sources for denitrification.…”

Section: Effects Of Organic Carbon and Initial Nitrate Concentration mentioning

confidence: 99%

Nitrate bioreduction in redox-variable low permeability sediments

Shen

Liu

et al. 2016

Science of The Total Environment

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Lowpermeability zone (LPZ) can play an important role as a sink or secondary source in contaminant transport in groundwater system. This study investigated the rate and end product of nitrate bioreduction in LPZ sediments. The sedimentswere fromthe U.S. Department of Energy's Hanford Site,where nitrate is a groundwater contaminant as a by-product of radionuclide waste discharges. The LPZ at the Hanford site consists of two layerswith an oxidized layer on top and reduced layer below. The oxidized layer is directly in contact with the overlying contaminated aquifer, while the reduced layer is in contact with an uncontaminated aquifer below. The experimental results showed that nitrate bioreduction rate and end-product differed significantly in the sediments. The bioreduction rate in the oxidized sediment was significantly faster than that in the reduced one. A significant amount of N2O was accumulated in the reduced sediment; while in the oxidized sediment, N2O was further reduced to N2. RT-PCR analysis revealed that nosZ, the gene that codes for N2O reductase, was below detection limit in the reduced sediment. Batch experiments and kinetic modeling were performed to provide insights into the role of organic carbon bioavailability, biomass growth, and competition between nitrate and its reducing products for electrons fromelectron donors. The results revealed that it is important to consider sediment redox conditions and functional genes in understanding and modeling nitrate bioreduction in subsurface sediments. The results also implied that LPZ sediments can be important sink of nitrate and a potential secondary source of N2O as a nitrate bioreduction product in groundwater.

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Assessing the influence of the carbon oxidation-reduction state on organic pollutant biodegradation in algal–bacterial photobioreactors

Cited by 21 publications

References 15 publications

Biodegradation of bisphenol A by an algal-bacterial system

Biodegradation of bisphenol A by an algal-bacterial system

Methane oxidation coupled to oxygenic photosynthesis in anoxic waters

Nitrate bioreduction in redox-variable low permeability sediments

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