| 污泥焚烧过程中氯化物对Cd迁移行为的影响 |
| 摘要点击 2614 全文点击 1628 投稿时间：2013-10-07 修订日期：2014-01-23 |
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| 中文关键词 污泥焚烧 Cd 迁移 形态 氯化物 |
| 英文关键词 sludge incineration cadmium partitioning speciation chloride |
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| 中文摘要 |
| 采用固定层燃炉及向污泥中添加Cd方式，分别研究了污泥焚烧过程中有机氯（PVC）与无机氯（NaCl）对Cd迁移转化行为的影响，同时考察了不同焚烧条件下Cd的迁移及分布规律. 结果表明，污泥焚烧过程中不同氯化物的加入均增强了Cd向飞灰或者烟气中迁移，但随着氯化物加入量的增加，Cd挥发增加的趋势并不明显. 随温度的升高，有机氯（PVC）与无机氯（NaCl）均使得Cd 在底渣中的分布减少，而焚烧时间及初始浓度对Cd 迁移分布没有显著影响. 底渣和飞灰的SEM-EDS和XRD分析表明，污泥焚烧过程中NaCl的加入导致Cd易与氯化物形成CdCl2、Na2CdCl4、K2CdCl6、K2CdSiO4和NaCdO2，而PVC的加入，除了与Cd形成Na2CdCl4和CdCl2外，还生成了K4CdCl6和K6CdO4 氯化物，可见有机氯（PVC）与无机氯（NaCl）对Cd迁移转化影响主要与Cd的生成物种类及形态有关. |
| 英文摘要 |
| The effects of organic chloride-PVC and inorganic chloride-NaCl on Cd partitioning during sludge incineration with adding Cd(CH3COO)2·2H2O to the real sludge were investigated using a simulated tubular incineration furnace. And transformation and distribution of Cd were studied in different sludge incineration operation conditions. The results indicated that the partitioning of Cd tended to be enhanced in the fly ash and fule gas as the chloride content increasing. The migration and transformation of Cd-added sludge affected by different chloride were not obvious with the increasing of chloride content. With increasing temperature, organic chloride (PVC) and inorganic chloride (NaCl) can reduce the Cd distribution in the bottom ash. However, the effect of chlorides, the initial concentration and incineration time on Cd emissions had no significant differences. Using SEM-EDS and XRD technique, different Cd compounds including CdCl2, Na2CdCl4, K2CdCl6, K2CdSiO4 and NaCdO2 were formed in the bottom ash and fly ash after adding NaCl to the sludge. In contrast, after adding PVC to the sludge, the Na2CdCl4 and CdCl2 were the main forms of Cd compounds, at the same time, K4CdCl6 and K6CdO4 were also formed. The two different mechanisms of chlorides effects on Cd partitioning were affected by the products of Cd compound types and forms. |
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