Changes of the porous structure of activated carbons applied in a filter bed pilot operation

Gauden, Piotr A.; Szmechtig-Gauden, E.; Rychlicki, Gerhard; Düber, S.; Garbacz, J. K.; Buczkowski, Roman

doi:10.1016/j.jcis.2005.08.039

Cited by 21 publications

(5 citation statements)

References 71 publications

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“…In concept, biological degradation could have played a role after day 136, when water temperatures ranged from 108C to 278C. Biodegradation has been noted as a mechanism for NOM removal when water temperatures have been elevated, particularly in the late stages of long-term GAC operations (Nishijima and Speitel, 2004;Gauden et al, 2006). A rigorous appraisal of biodegradation was beyond the scope of this study.…”

Section: Toc Removalmentioning

confidence: 99%

Relationships Between Adsorption Mechanisms and Pore Structure for Adsorption of Natural Organic Matter by Virgin and Reactivated Granular Activated Carbons During Water Treatment

Moore

Wang

Cannon

et al. 2010

Environmental Engineering Science

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Temporal changes in the pore structure of granular activated carbons (GACs) were investigated for two reactivated and one virgin GAC during water treatment. One reactivated GAC had experienced five cycles of treatment and reactivation (5xReac), whereas the other had experienced twelve cycles (12xReac). For the virgin GAC that became loaded with natural organic matter (NOM), nearly all pore volume loss occurred in pores <40 Å , with little change in pores >40 Å . For the 5xReac, the greatest loss of pore volume occurred in the 100-500 Å pores. The 12xReac GAC experienced some loss of pore volume in the 100-500 Å pores. For each GAC, NOM adsorption initially caused pore volume loss in pores that were only slightly wider than the NOM itself. Subsequent to this initial stage, NOM was mostly retained in the 20-40 Å pores for the virgin GAC and in the 100-500 Å pores for the 5xReac GAC. This was followed by gradual migration of the NOM into smaller pores. A lull in NOM loading revealed distinctions in how NOM migrated in the virgin and reactivated GACs. This was characterized by more gradual changes in pore volume distribution for the reactivated GAC than for the virgin GAC. This work is original in that it offers evidence that organic sorbate may desorb to an extent that can be discerned by pore volume distributions when the total organic carbon influent levels drop below previous levels. The work also offers impact on the GAC field in that it carefully appraises relative sorption performance of a virgin, 5xReac, and 12xReac GAC during a concurrent loading interval. The results show that micropores, mesopores, and positive surface charge are important for sorbing NOM.

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Section: Toc Removalmentioning

confidence: 99%

Relationships Between Adsorption Mechanisms and Pore Structure for Adsorption of Natural Organic Matter by Virgin and Reactivated Granular Activated Carbons During Water Treatment

Moore

Wang

Cannon

et al. 2010

Environmental Engineering Science

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“…At the steady state, biodegradation was dominant and the previously adsorbed pollutant was removed by the bioregeneration capacity of the BAC. During the transient conditions, the remaining adsorption capacity of the BAC had the ability to buffer the shock loading (Putz, 2004;Adib et al, 2000;Gauden et al, 2006).…”

Section: Elemental Analysismentioning

confidence: 99%

Application of biological activated carbon as a low pH biofilter medium for gas mixture treatment

Liu

Chiaw

Ning

2006

Biotech & Bioengineering

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Packing material is a crucial component of a bioreactor as it is the microbial population's habitat. This study assessed potential improvements to current biofiltration processes by investigating use of a novel support medium. Biological activated carbon (BAC) with microorganisms growing on granular activated carbon can produce a novel medium in which both adsorption and biodegradation contribute to pollutants removal. Investigation of carbon characteristics demonstrated that BAC was an ideal packing medium for biofiltration. The application of the novel packing medium for gas mixture treatment was evaluated in a low pH biofilter. Results demonstrated that BAC biofilter obtained high removal efficiency for both H(2)S and toluene. The removal mechanisms of BAC were investigated after the biofilter operation and it demonstrated that the performance of the BAC system was mainly controlled by the additive contributions of two removal mechanisms - adsorption and biodegradation. This study also indicated the potential for simultaneous treatment of hydrogen sulfide and toluene at low pH condition.

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“…Nanoscale porous carbon or diamond like carbon (DLC) films have attracted much interest due to their enormous potential applications on electrochemical hydrogen storage, [1] photovoltaic cells, [2] catalyst, [3] super-capacitors, [4] filters, [5,6] and other applications. [7] Many studies of porous DLC films have been conducted recently based on various techniques.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and control of micro to noanscale porous structures of diamond like carbon films

et al. 2006

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Diamond like carbon (DLC) films are synthesized on various substrates using a pulsed KrF excimer laser ablation deposition technique. Variations of laser power density, substrate temperature, angle and distance between the substrate and target yield different sizes of porous surfaces of DLC films. Microscope is used to examine the surfaces. Raman scattering is used to characterize the samples, and the typical G and D bands have been identified. Intensities and profiles of the G and D bands closely depend on laser power density. The relationship between the deposition rate and the power density is also studied.Keyword: pulsed laser beam, porous structure, diamond like carbon films Mater. Res. Soc. Symp. Proc. Vol. 954

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Changes of the porous structure of activated carbons applied in a filter bed pilot operation

Cited by 21 publications

References 71 publications

Relationships Between Adsorption Mechanisms and Pore Structure for Adsorption of Natural Organic Matter by Virgin and Reactivated Granular Activated Carbons During Water Treatment

Relationships Between Adsorption Mechanisms and Pore Structure for Adsorption of Natural Organic Matter by Virgin and Reactivated Granular Activated Carbons During Water Treatment

Application of biological activated carbon as a low pH biofilter medium for gas mixture treatment

Synthesis and control of micro to noanscale porous structures of diamond like carbon films

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