Ashes resulting from the combustion of wood residues in industrial boilers are characterized relative to (i) macroelement compositions, (ii) trace and heavy metal microelement compositions, (iii) organics, and (iv) polychlorinated dibenzo‐dioxins and ‐furans (PCDD/Fs). Ash compositions, both macro‐ and microelements, are compared with coal ash and limestone. Microelements in wood ashes are also compared with other potential soil amendments such as pulp mill sludges. The impact of burning sludge and combinations of coal and wood residue on ash metal concentrations is presented. Levels of PCDD/Fs in ash resulting from combustion of 100% inland wood residue, salty wood, or bleached mill sludge with wood residue are reviewed, as are the levels of PCDD/Fs in ashes and soot resulting from residential wood combustion. The concentrations of metals in wood ash are comparable to other potential soil amendments. The concentration in wood ash of common organics of environmental concern appears to be negligible. The levels of PCDD/Fs in the ash appear to have a direct correlation with extraneous sources of chloride in the wood fuel.

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The absorption characteristics of sulfur dioxide into a stagnant body of distilled water are investigated in the presence of point-plane ionic discharges in a closed chamber at 30 ± 0.1 °C. S02 removal is seen to be enhanced when the liquid surface is subjected to the discharge, with the bulk of the enhancement resulting in acidic deposition within the chamber. Gas-phase oxidation of S02 in the absence of liquid water is seen to be minimal. The effects of varying the discharge intensity and polarity and gas oxygen content on the observed absorption rate enhancements are reported.

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