By Ljubisa R. Radovic

"Provides an outline of clinical and technological concerns in environmental functions of carbon fabrics. Emphasizes the flexibility of carbon fabrics in either gasoline- and liquid-phase environmental purposes, together with a dialogue of rising applied sciences. Highlights the facility and strength possibilities afforded via NMR spectroscopy for knowing the interplay of carbon fabrics with adsorbed molecules."

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A booster fan is required in the flue gas stream to overcome the pressuredrop across the beds. Oxidesof nitrogen are Derbyshire et al. 30 m Activated carbon regenerated I Activated carbonsaturated FIG. 17 Schematic of Mitsui process for de-SO, (lowcr adsorber) and de-NO, (upper adsorber). (Adapted from Ref. If SO: is present. some ammonia is consumed in the formation of ammonium salts, rcsulting it1 the inefficient use of amlnonia and possible blockages due to salt deposition. Hence NO, reduction is preferably conducted after substantial SO2removal, which occurs in the lower.

The recirculation and purification of air has the added economic advantages of reducing heating or refrigeration costs. Other applications include the use of activated carbons in domestic kitchen cooker hoods to adsorb cooking odors and vapors and activated carbon filters incorporated in air purifiers for private homes. High efficiency particulate air (HEPA) filters have been available for some time for the removal of allergens and dust. In more sophisticated air treatment systems, HEPA filters are combined with activated carbon adsorbents for the removal of human and cooking odors.

The carbon becomes inactive for further adsorption of SO,, as illustrated in Fig. 12. When a gas stream containing SO? is passed through a bed of activated carbon, there is complete removal of SOz for a period, during which the SO, is removed by both physical and chemical adsorption (Zone I). At the breakthrough point, the SOzconcentration downstream of the adsorber unit begins to rise, as all the physical adsorption sites are occupied and only chemical adsorption and reaction to produce H2S04are available for SO: removal (Zone 11).

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