Emissions of Polychlorinated Dibenzodioxins and Dibenzofurans and Polychlorinated Biphenyls from Uncontrolled Burning of Garden and Domestic Waste (Backyard Burning)

摘要

To assess emissions of dioxins (chlorinated dibenzodioxins and dibenzofurans) and PCB from uncontrolled domestic combustion of waste ("backyard burning"),test combustions in barrels and open fires were monitored.The waste fuels used were garden waste,paper,paper and plastic packaging,refuse-derived fuel (RDF),PVC,and electronic scrap.Combustions including PVC and electronic scrap emitted several orders of magnitude more dioxins than the other waste fuels.Emissions from the other fuels had considerable variations,but the levels were difficult to relate to waste composition.Emission factors of PCDD/F and PCB from the backyard burning ranged from 2.2 to 13 000 ng (WHO-TEQ)/kg.The levels found in ash usually were less than 5% of the total.For assessment of total emissions of dioxins and PCB from backyard burning of low and moderately contaminated wastes,an emission factor range of 4-72 ng (WHO-TEQ)/kg is suggested.These figures imply that combusting waste in the backyard could contribute substantially to total emissions,even if the amounts of fuel involved are equivalent to just a few tenths of a percent of the amounts combusted in municipal waste incinerators.