Plasma treatment of air pollution control residues

Glass‐Ceramic Tiles Prepared by Pressing and Sintering DC Plasma‐Vitrified Air Pollution Control Residues

“…69.8 wt% APC residues, 21.9 wt% SiO 2 (supplied by T. J. Sansum, U.K., 99% purity, <1 mm grain size) and 8.3 wt% Al 2 O 3 (Chinese bauxite, 3–5 mm grain size) were fed to the DC plasma furnace to give a normalized bulk solid oxide input composition in the anorthite region of the Al 2 O 3 –SiO 2 –CaO phase diagram 13 . After DC plasma treatment the molten APC residue‐derived glass was quenched into water to produce a fritted sample with particle sizes typically ∼5 mm.…”

“…XRD analysis of the fritted APC‐derived glass indicated an amorphous/glassy material. Its tendency towards crystallization has been evaluated by thermal analysis reported in previous work 13 …”

“…Previous studies on mixed medical wastes, incinerator fly ash and bottom ash, as well as radioactive wastes have shown that plasma treatment is a promising thermal technology for hazardous wastes 7–12 . Direct current (DC) plasma technology has been demonstrated to convert APC residues into an inert material with potential for beneficial reuse 13 . The high temperature of thermal plasma completely destroys dioxins and furans and the plasma treated vitrified product is a stable, inert, nonleachable, and recyclable glass product.…”

“…Compliance leach testing has demonstrated that only trace amounts of Pb (<0.007 mg/kg) and Zn (0.02 mg/kg) are leached, and these are at levels significantly below the WAC limits for waste disposal in inert landfill 14 . During DC plasma treatment some of the volatile heavy metals and Cl − originally present in the as‐received APC residues are volatilized and recovered as the product and subsequently heavy metals are volatilized and collected as a very low‐volume (5–8 wt%) secondary APC residue in the bag house filter of the DC plasma plant 13 …”

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

“…[1][2][3][4] In recent years, with the increasingly serious air pollution, corona discharge has attracted broad attention for its application in atmospheric controlling. [5][6][7][8] In the needle-plate model, when a certain range of negative voltage is applied to the electrode with smaller curvature radius, a chain of regular pulses with short rising time and relatively long intervals can be observed, also known as Trichel pulses. [9][10][11][12] Experiments [13][14][15][16] and numerical simulations [17][18][19][20][21] were carried out to study this issue these years.…”