Polycyclic aromatic hydrocarbons in coal combustion flue gas under electron beam irradiation

Organic Pollutants Treatment from Air Using Electron Beam Generated Nonthermal Plasma – Overview

“…The concentration of hydrocarbons of small aromatic ring (PAHs, like naphthalene (C 10 H 8 ), acenaphthene (C 12 H 10 ), fluorene (C 13 H 10 ), anthracene (C 14 H 10 )) was reduced, while the concentration of fluoranthene was increased remarkably after irradiation. Similar experiments were carried out in EPS Kawęczyn with ammonia presence but without alcohol addition Ostapczuk et al, 2008a). It was found that removal efficiency of PAHs ranges from 40% up to 98%.…”

“…It was relatively low, varied from few up to 12 μg per kg of fertilizer for the experimental work carried out in EPS Kawęczyn, Poland. Less than 3% of PAH were removed in adsorption on the by-product surface (Ostapczuk, et al, 2008a). The study in Maritza-East TPP allowed PAH assessment in solid by-products obtained from EB lignite-combustion flue gas.…”

Naphthalene and Acenaphthene Decomposition by Electron Beam Generated Plasma Application

“…The pilot plant tests carried out for waste-incineration flue gas have shown 80% of decomposition ratio for dioxins (with initial concentration of 1 ng m -3 ) for 10 kGy dose applied and over 90% for 14 kGy [6]. The other works performed in pilot scale for 16 Polycyclic Aromatic Hydrocarbons (PAH) present in the flue gas from coal combustion, demonstrated remarkable reduction of their initial concentration from *10 -3 to *10 -4 ppmv at the dose of 8 kGy with simultaneous SO x and NO x removal [7,8]. PAH removal from flue has been also investigated in gliding arc discharge reactor where removal efficiency over 70% was gained [9].…”

“…EB treatment of these compounds has been investigated in pilot scale and two different tendencies were observed: reduction of concentration of the most volatile PAH (like NL and AC) in flue gas from lignite combustion [10] in opposite to slight increase observed in coal combustion flue gas [7,8]. The change of PAH concentration in flue gas can be caused by the combination of three processes: PAH destruction in radiation-induced chemical processes, PAH adsorption on the surface of fertilizer and PAH formation in radical processes.…”

Kinetic Mechanisms of Electron-Beam Induced Polycyclic Aromatic Hydrocarbons Transformation in Flue Gases

“…As experimental data show, the interaction of aromatic molecules with active components induced by EB treatment of flue gases results in their decomposition [7][8][9]. On the other hand, at some process conditions it is observed the formation of higher-ringed compounds, which may be more toxic than initial ones [10].…”