烟草废弃物快速堆肥过程中重金属Cd形态变化特征

以烟草废弃物为原料,活性土壤为载体建立堆体,研究重金属镉的形态变化,及堆肥过程中的动态变化规律。结果表明,烟草废弃物与活性土壤混合能快速腐熟。堆肥总质量下降,重金属镉含量相对增加。重金属镉的铁锰氧化态比例增加19%,有机结合态比例在堆肥升温阶段增加,腐熟后有所下降。残渣态比例大幅度上升,增加达到5倍,且在腐熟阶段增幅最大。说明堆肥处理有利于降低重金属镉的活性。

Speciation Change of Heavy Metal Cd during the Fast Composting Process of Tobacco Wastes

In this paper, tobacco wastes were taken as raw materials and composted with active soils to study the morphological change of the heavy metal cadmium during the composting process. The results showed that the tobacco wastes mixed with the active soils were decomposed rapidly. The total mass of compost decreased and the content of cadmium increased relatively. The ratio of Fe-Mn oxides fraction of cadmium increased by 19%, and the proportion of organic fraction increased at the warming stage but decreased after the maturity stage. The ratio of residue state increased significantly by 5 times and reached to the maximal in the maturity stage, indicating that the composting treatment was beneficial to reduce the activity of cadmium.