ヘキサクロロベンゼンによる焼却灰中ダイオキシン熱分解装置の性能評価

概要

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To evaluate capability of a thermal decomposer for dioxins in fly ash, it is necessary to determine the decomposition ratio of PCDDs and PDCFs. However, measurement steps of PCDDs and PCDFs and PCDFs by GC/MS are not so easy and require a long time. Experiments were carried out by a thermal decomposer with a rotary kiln, and decomposition ratio of PCDDs, PCDFs and chlorobenzens in fly ash were compared. It was found that haxachlorobenzene could be a index compound for evaluation of capability of a dioxins decomposer. Chlorobenzens which are formed and decomposed on fly ash similarly to dioxins can be measured easily as follows. Cholorobenzens are extracted from non treated and thermal treated ash samples (5g) to aceton (10ml) with supersonic waves for ten minutes, and solutions area analyzed by GC/ECD with a capillary column on a splitless mode. The lower detection limit of haxachlorobenzene in fly ash is 0.1ng/g.