Carbon Injection Proves Effective In Removing Dioxins

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During the past several years, there has been growing concern about emission of polychlorinated di-benzo-p-dioxins and polychlorinated di-benzofurans (PCDDs/PCDFs). Dioxins and related compounds are byproducts of combustion formed by recombining other organic constituents and chemical reactions in the combustion effluent-gas stream. Generally, dioxins are formed in the cooler regions of the combustion system, where condensation onto fly-ash particles can occur. Certain metals can also act as catalysts and promote dioxin formation. Much of the attention concerning PCDDs/PCDFs has focused on hazardous-waste combustion facilities. Actually, incinerators are a relatively minor contributor to the overall dioxin/furan environmental burden compared to medical and municipal waste combustors.

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