Advanced oxidant reactivity pertaining to granular activated carbon beds for air pollution control

Dusenbury, James S.; Cannon, Fred S.

doi:10.1016/s0008-6223(96)00113-3

Cited by 25 publications

(14 citation statements)

References 16 publications

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“…Dusenbury and Cannon [39] have explained that the reaction between ozone and granular activated carbon results in the formation of epoxides as well as ozonides. He et.…”

Section: Resultsmentioning

confidence: 99%

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

Manchester

Wang

Külaots

et al. 2008

Carbon

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A set of carbon materials was treated by a choice of common oxidizers to investigate the mercury capture capacities at varying temperature conditions. It was found that ozone treatment dramatically increases the mercury capture capacity of carbon surfaces by factors up to 134, but the activity is easily destroyed by exposure to the atmosphere, to water vapor, or by mild heating. Freshly ozonetreated carbon surfaces are shown to oxidize iodide to iodine in solution and this ability fades with aging. FTIR analysis shows broad C-O stretch features from 950 to 1300 cm −1 , which decay upon atmospheric exposure and are similar to the C-O-C asymmetric stretch features of ethylene secondary ozonide. The combined results suggest that the ultra-high mercury capture efficiency is due to a subset of labile C-O functional groups with residual oxidizing power that are likely epoxides or (epoxide-containing) secondary ozonides. The results open the possibility for in situ ozonolysis to create high-performance carbon-based Hg sorbents.

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“…Dusenbury and Cannon [39] have explained that the reaction between ozone and granular activated carbon results in the formation of epoxides as well as ozonides. He et.…”

Section: Resultsmentioning

confidence: 99%

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

Manchester

Wang

Külaots

et al. 2008

Carbon

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“…long polyvinyl chloride (PVC) pipe that contained one low pressure Heraus-Amersil NIQ 40/18 UV lamp (HA). 25 Because this UV light generated light in both the 185 and 220 -240-nm wavelengths, it also generated O 3 .…”

Section: Materials and Methods Mibk And Uv Reactormentioning

confidence: 99%

“…This UV reactor exposure created an O 3 concentration of 150 -250 ppm in the regenerant airstream at the influent face of the GAC bed, as determined by a Dasibi 1008-HC ozone meter. 25 This also created a total advanced oxidant concentration of 6920 -11,540 ppm as O 3 , 25,27 as determined by the idometric method. [27][28][29] The total advanced oxidants that the iodometric method will monitor include hydrogen peroxide, OH*, HO 2 * O 3 , and a host of radical scavengers (but it will not monitor O 2 ).…”

Section: Gac Biofilter Systemmentioning

confidence: 99%

“…The reasons for this enhanced removal stems both from (1) the ability of the AO and O 3 to convert a fraction of the MIBK to smaller and more oxygenated byproducts, and (2) the influence that AO and O 3 have in causing MIBK to desorb from the GAC surface. 25,27,28 These features are limited by the extent to which O 3 and AO can penetrate into the GAC bed.…”

Section: Mechanism Of O 3 /Ao Enhancementmentioning

confidence: 99%

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Effect of Advanced Oxidants Generated Via Ultraviolet Light on a Sequentially Loaded and Regenerated Granular Activated Carbon Biofilter

Dusenbury

Cannon

2004

Journal of the Air & Waste Management Association

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The objective of this research was to investigate a sequentially loaded and regenerated granular activated carbon (GAC) biofilter system and to determine whether regenerative ozonation/advanced oxidation could improve the removal and biodegradation of a volatile organic compound from a contaminated airstream. Bench-scale reactors were constructed to operate in a manner analogous to a commercially available system manufactured by TerrAqua Environmental Systems (only with longer contact time). The GAC system consisted of two GAC biofilter beds that operated in a cyclical manner. On a given day, the first GAC bed adsorbed methyl isobutyl ketone from a simulated waste airstream, while the second bed underwent regeneration; then on the next day, the second bed was in the adsorption mode while the first was regenerated.Three bench-scale systems were used to compare the performance under three operating conditions: (1) ozone/ associated oxidant regeneration of a GAC biofilter system that was seeded with microorganisms from a field site, (2) a humid air regeneration of a seeded GAC biofilter, and (3) a humid air regeneration of an unseeded GAC biofilter. For the advanced oxidant regenerated GAC biofilter, a maximum removal efficiency of Ͼ95% was achieved with an empty bed contact time of 148 sec and an influent concentration of 125 ppm methyl isobutyl ketone, and 90 -95% was achieved at 148-sec empty bed contact time and a 1150-ppm influent.

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“…Hwang et al 12 examined the use of ozonation in addition to granular activated carbon adsorption and aerated biofilters for removing dissolved odorous compounds in wastewater. Cannon et al 13 and Dusenbury and Cannon 14 reported regeneration of activated carbon for volatile organic compound (VOC) control by an advanced oxidation process utilizing hydroxyl radicals originating from ozone. The reaction of ozone with H 2 S in the air phase is expressed by the following equation: 15,16 …”

Section: Introductionmentioning

confidence: 99%

Ozone Injection into an Activated Carbon Bed to Remove Hydrogen Sulfide in the Presence of Concurrent Substances

Masuda

Fukuyama²,

Fujii³

2001

Journal of the Air & Waste Management Association

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Adsorption using activated carbon is one of the most reliable techniques for preventing odor by substances such as H 2 S. Concurrent substances in effluent gas often reduce the removal capacity of activated carbon for H 2 S. As a means of restoring capacity under such conditions, ozone injection into an activated carbon column was examined. When activated carbon was saturated with substances such as toluene, ethanol, n-butanol, or iso-butanol, its capacity to remove H 2 S decreased in proportion to the amount of the saturating substance. Under such conditions, ozone injection greatly increased capacity. Toluene, which is not easily decomposed by ozone, was displaced by ozone and by oxidized products of H 2 S. Ethanol, which is adsorbed in small amounts by activated carbon and easily decomposed by ozone, was removed by ozone injection. Butanols, which are also decomposed by ozone and adsorbed in large quantities by activated carbon, showed intermediate behavior between that of toluene and ethanol.

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Advanced oxidant reactivity pertaining to granular activated carbon beds for air pollution control

Cited by 25 publications

References 16 publications

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

Effect of Advanced Oxidants Generated Via Ultraviolet Light on a Sequentially Loaded and Regenerated Granular Activated Carbon Biofilter

Ozone Injection into an Activated Carbon Bed to Remove Hydrogen Sulfide in the Presence of Concurrent Substances

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