Abstract
In the high-temperature combustion of chlorine-bearing wastes (>1600°C), all the organic compounds—including dioxins, furans, and chlorinated phenols—are instantaneously destroyed. Subsequent cooling of the chlorine-bearing gas below 500°C creates conditions for secondary dioxin formation. The probability of dioxin formation in these conditions is found to increase with increase in the gas’s content of oxygen, chlorine, and fluorine but also with decrease in its sulfur content. Effective suppression of secondary dioxin formation entails the combustion of wastes with minimum residual oxygen content in the gas. With high chlorine and fluorine content in the waste, the high-temperature neutralization of the gas by compounds of alkaline or alkaline-earth elements is required (for example, by injection of sodium-carbonate powder in the gas).
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