Oxide treatment boards

The total emission In the commercial heat treatment of 5 to 8 hours at 170 to 160°C varied from 0.4 to 1.2% for CO2 and 0.05 to 0.2% for CO and 0.04 to 0.1% for total acids based on dry board. Some of this emission might emanate from pyrolysis of higher molecular weight material condensed and deposited on the walls of the heat treatment chamber. The heat of formation of this CO2 and CO Is about half the total heat release measured. Part of the oxidation products might remain in the solid phase within the board material, e.g. as bound carbonyl and carboxylic groups, partly followed by heat consuming dehydration reaction. 

NRC. 2001d. Assessment of Supercritical Water Oxidation Technology Development for Treatment of VX Hydrolysate at the Newport Chemical Agent Disposal Facility. Letter Report of the Committee on Review and Evaluation of the Army Chemical Stockpile Disposal Program. Washington, D.C. Board on Army Science and Technology. 

More than 80% of all sodium chlorite produced is used for the generation of chlorine dioxide. Sodium chlorite is also used in disinfectant formulations and sterilization. Like chlorine dioxide, it must be registered with EPA under FIFRA for each specific application use as a disinfection. Sodium chlorite is used in other industrial settings in NO and SO combustion flue gas scrubber systems in the treatment and removal of toxic and odorous gases such as hydrogen sulfide and mercaptans and as a solution formulation to oxidize copper surfaces in multilayer circuit boards (Kaczur and Cawlfield 1993). 

After treatment of shreddered printed circuit boards we received the following results The brominated epoxy resin has been oxidized to carbon dioxide, water and bromide. Glas fibers and residual metals are not changed through this process. The weight reduction was approx. 50 %. 

The October 8, 2007, CDCAB resolutions on treatment of noncontaminated rocket motors repeated the board s earlier position indicating potential support for either offsite recycling at a government facility or treatment at the planned BGCAPP supercritical water oxidation (SCWO) facility. The resolutions also supported study of the use of the static detonation chamber for noncontaminated rocket motors only (CDCAB, 2007). 

In the second example, white water from a recycle board mill with a high degree of closure was used (very high demand). Even at concentrations as high as 40 ppm actives (CI2), the oxidants had little effect. Because of high oxidant demand, oxidants are usually not used in recycle board mill process water treatment. 

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