Adsorption/desorption equilibria and conversion to polychlorinated dibenzo-p-dioxins

Article Abstract:

Tetrachlorophenol (T4CP) reactions to polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans formation in the presence of fly ash were measured as a function of concentration and reaction time. PCDD formation rates ranged from about 0 to 35 ug of PCDD-1 min-1 as a result of T4CP concentrations ranging from 150 to 700 ng./ml/ in 10% O2 and temperatures ranging from 250 to 400 degrees Centigrade. It was found that the reactor approached differential behavior, which led to the breakthrough of the T4CP and the desorption of adsorbed PCDD products into the gas-phase.

Dibenzofurans, Thermal desorption

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Formation of polychlorinated dioxins, furans, benzenes, and phenols in the post-combustion region of a heterogeneous combustor: effect of bed material and post-combustion temperature

Article Abstract:

A study was conducted to investigate the formation of polychlorinated dibenzo-p-dioxins and furans (PCDD/F) in the post-combustion region of solid waste incinerators at temperature ranging from 200-300 degrees centigrade in the presence of two types of bed materials, sand and quartz. The results indicated absence of PCDD/F and the formation of chlorobenzenes and chlorophenol, with a faster rate of formation of trichlorobenzenes and dichlorophenols in sand over quartz beds. This suggests that the type of bed material has an effect on PCDD/F formation.

Air pollution control, Incinerators, Air quality management, Organochlorine compounds, Organic chlorine compounds

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Equilibrium surface coverage and global kinetics

Article Abstract:

Chlorophenols are highly adsorptive on fly ash while satisfying a Freundlich adsorption isotherm. This was gleaned from a measurement of the adsorption properties of chlorophenols, mostly 2,3,4,6-tetrachlorophenol, on municipal solid waste incinerator fly ash as a function of temperature and gas-phase chlorophenol concentration. Adsorption of chlorophenols on fly ash was found to be slower in the presence of oxygen.

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