印染污泥掺煤焚烧过程中重金属分配与归趋特性研究

DISTRIBUTION AND INCIDENCE CHARACTERISTICS OF HEAVY METALS DURING THE PRINTING AND DYEING SLUDGE COMBUSTION

掺煤焚烧是佛山地区印染污泥处置的一种常用方法。针对佛山金纺集团印染污泥掺煤焚烧处理工程,对污泥、燃煤、炉渣以及飞灰的重金属含量及浸出毒性进行了分析测定,对重金属在炉渣、飞灰中富集分配规律进行了研究。结果表明:金纺集团印染污泥中锌是最主要重金属污染物;经掺煤焚烧以后,炉渣中重金属的残留率顺序为镍>铜>铬>锌,残留率越小,说明该重金属越容易富集到飞灰中。飞灰中重金属的富集率远高于炉渣,飞灰属于危险废弃物。因此印染污泥掺煤焚烧工程运行中,提高尾气除尘效率对避免重金属的二次污染至关重要,同时飞灰应作为危险废物妥善处置。

Incineration technology is one of the common methods to deal with the dyeing sludge. The heavy metal in printing and dyeing sludge may cause serious environmental pollution. The sludge samples collected from Foshan Golden Factory were used to study the distribution of heavy metals in the process of blending coal burning. The results showed that the sludge contained a certain amount of heavy metals. Through the mixed coal burning,heavy metals can effectively residue after the burning of solid material. And the heavy metal in fly ash is higher than the heavy metals content in slag.