Treatment of Groundwater Contaminated with PAHs, Gasoline Hydrocarbons, and Methyl tert-butyl Ether in a Laboratory Biomass-Retaining Bioreactor

Zein, Maher M.; Pinto, Patricio X.; Garcia-Blanco, Susana; Suidan, Makram T.; Venosa, Albert D.

doi:10.1007/s10532-005-3049-x

Cited by 37 publications

(16 citation statements)

References 39 publications

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“…5). This behavior was consistent with the fact that results published up to now have clearly demonstrated that the feasibility of BTX biodegradation through aerobic bioreactors could be considered as well established [23,24]. When the solid adsorbent was used with a low BTX loading (0.02 g/g), the residual pollutant concentration in the liquid was close to zero, as expected from Fig.…”

Section: Resultssupporting

confidence: 91%

BTX Removal from Polluted Water Through Bioleaching Processes

Farhadian

Duchez

Vachelard

et al. 2008

Appl Biochem Biotechnol

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In this study, benzene, toluene, and xylenes (BTX) removal from contaminated water by physical, chemical, and biological processes was studied. Results showed that air sparging in polluted water can reduce monoaromatic compounds from 140,000 to about 5 microg/l in only 1 h process with a gassing rate of 0.33 VVM. This method cannot be considered as a green technology as pollutants are only transferred from the liquid phase to the gas phase The ultimate objective of this research was thus to evaluate the efficiency of a strategy involving BTX adsorption by granular-activated charcoal (GAC) and subsequent regeneration of this support by a bioleaching process. Analysis of such processes requires the building of analytical tools able to accurately determine the contents of the contaminants in samples containing biomass to make possible the calculation of reliable material balances. Current investigation showed that BTX are readily trapped by GAC particles with low further release in the liquid medium whereas they remain at least partially available for in situ biodegradation. BTX adsorption onto the GAC was shown to reach maximum solute retention close to 350, 250, and 150 (as mg/g GAC) for xylenes, toluene, and benzene, respectively. This approach, which could afford efficient biological active carbon regeneration, is very promising for the removal of BTX compounds from water without any further environment damage.

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Section: Resultssupporting

confidence: 91%

BTX Removal from Polluted Water Through Bioleaching Processes

Farhadian

Duchez

Vachelard

et al. 2008

Appl Biochem Biotechnol

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“…Their limited biodegradability has been ascribed to their aromatic chemical structure, and to their low water solubility, which reduces their availability to degrading organisms, leading to persistence in the environment. This has fueled interest in PAH biodegradation, 16 which has been studied widely in singlephase aqueous systems, 17,18 liquid-liquid TPPB processes 19,20 and polymer-water TPPBs. 21 Although the latter have been shown to outperform single-phase aqueous biodegradations, polymers used in these demonstrations were selected by trial and error, rather than via the rational strategy developed in this work.…”

Section: Resultsmentioning

confidence: 99%

A first principles approach to identifying polymers for use in two‐phase partitioning bioreactors

Parent

Capela

Dafoe

et al. 2012

J of Chemical Tech & Biotech

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BACKGROUND: Two-phase partitioning bioreactors (TPPBs) employ an immiscible phase to partition toxic substrates/products to/away from cells to reduce cytotoxicity and improve bioprocess performance. Initially, immiscible organic solvents were used as the sequestering phase, and their selection included consideration of solute-solvent affinity, which can be predicted through first principles consideration of solute activity and phase equilibrium thermodynamics. Polymers can replace organic solvents in such systems, however, their selection has largely been via heuristic means, and a more fundamental approach is necessary for future success in rational polymer identification.

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“…As such, remediating PAH-contaminated water is necessary to prevent exposure. Past wastewater, drinking water and ground water treatment schemes have shown that remediation can be accomplished in several ways [8][9][10][11][12]. Chemical oxidative processes are capable of degrading persistent and sorbed compounds and include treatments such as Fenton's reagent [13,14], modified Fenton's reagent [15], ozone [16,17], persulfate [15,18], or permanganate [15,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Using slow-release permanganate candles to remediate PAH-contaminated water

Rauscher¹,

Sakulthaew²,

Comfort³

2012

Journal of Hazardous Materials

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Surface waters impacted by urban runoff in metropolitan areas are becoming increasingly contaminated with polycyclic aromatic hydrocarbons (PAHs). Slow-release oxidant candles (paraffin-KMnO(4)) are a relatively new technology being used to treat contaminated groundwater and could potentially be used to treat urban runoff. Given that these candles only release permanganate when submerged, the ephemeral nature of runoff events would influence when the permanganate is released for treating PAHs. Our objective was to determine if slow-release permanganate candles could be used to degrade and mineralize PAHs. Batch experiments quantified PAH degradation rates in the presence of the oxidant candles. Results showed most of the 16 PAHs tested were degraded within 2-4 h. Using (14)C-labled phenanthrene and benzo(a)pyrene, we demonstrated that the wax matrix of the candle initially adsorbs the PAH, but then releases the PAH back into solution as transformed, more water soluble products. While permanganate was unable to mineralize the PAHs (i.e., convert to CO(2)), we found that the permanganate-treated PAHs were much more biodegradable in soil microcosms. To test the concept of using candles to treat PAHs in multiple runoff events, we used a flow-through system where urban runoff water was pumped over a miniature candle in repetitive wet-dry, 24-h cycles. Results showed that the candle was robust in removing PAHs by repeatedly releasing permanganate and degrading the PAHs. These results provide proof-of-concept that permanganate candles could potentially provide a low-cost, low-maintenance approach to remediating PAH-contaminated water.

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Treatment of Groundwater Contaminated with PAHs, Gasoline Hydrocarbons, and Methyl tert-butyl Ether in a Laboratory Biomass-Retaining Bioreactor

Cited by 37 publications

References 39 publications

BTX Removal from Polluted Water Through Bioleaching Processes

BTX Removal from Polluted Water Through Bioleaching Processes

A first principles approach to identifying polymers for use in two‐phase partitioning bioreactors

Using slow-release permanganate candles to remediate PAH-contaminated water

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