Biofilm covered granular activated carbon for decontamination of streams containing heavy metals and organic chemicals

Scott, J. A.; Karanjkar, A. M.; Rowe, Deborah

doi:10.1016/0892-6875(94)00115-s

Cited by 46 publications

(19 citation statements)

References 7 publications

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“…For divalent metals, K~d values for biofilm/GAC were 2-3 times greater than those with plain GAC, but for silver the increase was only 20% (Scott et al 1995a). The data also 2+ 2+ 2+ -2+ + indicated for biofilrn/GAC, an uptake rate order of Cu >Zn >Cd >N1 >Ag, compared to Ag+>Cu2+>Zn2+>Ni2+>Cd2+ for plain GAC.…”

Section: Introductionmentioning

confidence: 52%

“…With these biofilms attached, both rate and quantity of metal extraction are significantly increased over levels achieved by plain (non-biofilm) GAC (Scott et al 1994). As the biofilms do not "smother" the GAC, the surface remains accessible, if required, for co-adsorption of inorganic salts and organics (Scott et al 1995a(Scott et al & 1995b. GAC immobilisation of micro-organisms can also provide resistance against toxic agents and increase metabolic activity (Morsen and Rehm 1990).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption isotherms and diffusion coefficients for metals biosorbed by biofilm coated granular activated carbon

Scott¹,

Karanjkar²

1995

Biotechnol Lett

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Adsorption isotherms and diffusion coefficients for metals biosorbed by biofilm coated granular activated carbon

Scott¹,

Karanjkar²

1995

Biotechnol Lett

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“…Emerging treatment technologies for oilfield produced water ble organic carbon compounds (Cadena 1990;Chen 1997;Adhoum and Monser 2004), oil and grease (Hansen and Davies 1994;Gallup et al 1996;Doyle and Brown 1997;Yang et al 2002), and heavy metals (Scott et al 1995;Zamora et al 2000;Bose et al 2002). Materials used as adsorbents to treat oilfield produced water include activated carbon, natural organic matter, zeolites, clays, and synthetic polymers.…”

Section: Overview Of Research On Oil Sands Process Water Treatmentmentioning

confidence: 99%

Process water treatment in Canada’s oil sands industry: II. A review of emerging technologies

Allen

2008

Journal of Environmental Engineering and Science

170

131

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Canada's oil sands industry uses large volumes of freshwater to extract bitumen from surface-mined ore. With oil production expected to increase 3-fold over the next decade, process water treatment has become a critical issue for oil sands operators, both in terms of sustaining bitumen recovery and protecting freshwater resources. To identify candidate treatment technologies, a review was conducted on the state-of-the-art of water treatment in the oil industry. Significant developments include (i) chemical modifications to adsorbents and membranes to improve pollutant removal and reduce fouling; (ii) hybridization of adsorbent, membrane, and bioreactor technologies to enhance the biological treatment of toxic feedwaters; (iii) advances in photocatalytic oxidation of organic compounds; and (iv) implementation of large-scale treatment wetlands to treat hydrocarbon-contaminated wastewaters. In adapting treatment technologies to the oil sands, operators will need to consider the fouling potential of bitumen and fine clays, the effect of process water alkalinity on treatment performance, and the biodegradability of toxic organic compounds.Résumé : L'industrie des sables bitumineux au Canada utilise d'importants volumes d'eau douce afin d'extraire le bitume du minerai prélevé en surface. En considérant que la production de pétrole devrait tripler au cours de la prochaine décennie, le traitement de l'eau de procédé devient une préoccupation cruciale pour les exploitants des sables bitumineux en termes de récupération durable du pétrole et de la protection des ressources en eau douce. Afin d'identifier des technologies de traitement potentielles, un examen de l'état des connaissances sur le traitement des eaux a été réalisé pour l'industrie du pétrole. Les développements importants comprennent : (i) des modifications chimiques aux adsorbants et aux membranes afin d'améliorer l'élimination des polluants et réduire le colmatage; (ii) l'hybridation de l'adsorbant, la membrane et les technologies des bioréacteurs afin d'améliorer le traitement biologique des eaux d'entrée toxiques; (iii) des progrès dans l'oxydation photocatalytique des composés organiques; et (iv) l'implantation de marécages de traitement à grande échelle afin de traiter les eaux usées contaminées par les hydrocarbures. En adoptant ces technologies de traitement aux sables bitumineux, les exploitants devront tenir compte du potentiel de colmatage du bitume et des argiles fines, de l'effet de l'alcalinité de l'eau de procédé sur le rendement du traitement, ainsi que de la biodégradabilité des composés organiques toxiques.

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“…Other studies have also shown that aerated biological treatment processes can enhance metal retention and that aeration should take place prior to adsorption to limit the extent of biofi lm growth on the adsorbent medium packed in the column, thereby minimizing clogging. 36 This was noted in a study by Scott, et al, 39 where biofi lm growth was found to signifi cantly increase the cadmium and nickel adsorption capacity of granular activated carbon (GAC). Biofi lm growth on the surface of the adsorbents was also shown to increase the contacting area with the metal ions in a study by Cloirec et al 40 The cellular wall of the biofi lm has various surface functional groups which can interact with metal ions via ion exchange, complexation, and precipitation.…”

Section: Total Nitrogen Removalmentioning

confidence: 74%

Use of Sphagnum peat moss and crushed mollusk shells in fixed-bed columns for the treatment of synthetic landfill leachate

Champagne

2009

J Mater Cycles Waste Manag

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A laboratory bench-scale fi xed-bed column study operated as a down-fl ow confi guration was conducted to evaluate Sphagnum peat moss and crushed mollusk shells as natural low-cost adsorbents for the removal of heavy metals from aerated and unaerated synthetic landfi ll leachate. Columns were packed with 15 cm of prepared peat moss, or 15 cm adsorbent mixtures made up of peat moss and crushed mollusk shells (4.0-4.75 mm) from Lake Ontario at different bed depth ratios. Peat was found to have the best adsorption capacities in columns treating aerated synthetic leachate for cadmium and nickel with 78.6% and 83.8% removal effi ciencies, respectively. The removal of chemical oxygen demand (COD) and total nitrogen from the synthetic leachate was also monitored to evaluate the potential effects of biological activity on heavy metal adsorption. Columns receiving unaerated raw synthetic leachates did not show any signifi cant removal of COD and total nitrogen, whereas some reduction in COD and total nitrogen was noted in the columns treating aerated synthetic landfi ll leachate. The results suggested that biological activity and biofi lm growth could positively contribute to heavy metal retention within the fi xed-media biosorption columns.

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Biofilm covered granular activated carbon for decontamination of streams containing heavy metals and organic chemicals

Cited by 46 publications

References 7 publications

Adsorption isotherms and diffusion coefficients for metals biosorbed by biofilm coated granular activated carbon

Adsorption isotherms and diffusion coefficients for metals biosorbed by biofilm coated granular activated carbon

Process water treatment in Canada’s oil sands industry: II. A review of emerging technologies

Use of Sphagnum peat moss and crushed mollusk shells in fixed-bed columns for the treatment of synthetic landfill leachate

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