Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration
Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration
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污水污泥焚烧过程中氯和硫对目标金属（Cd、Pb）形态演化的影响
DOI：
10.1007/s11783-013-0621-1
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发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
Yun Zhao
中科院分区：
文献类型：
--
作者：
Rundong Li;Zhihui Zhang;Yanlong Li;Yun Zhao
在污泥焚烧过程中，重金属的热行为越来越受到关注。通过对污泥高温焚烧过程中重金属在气相和凝聚相中的分配行为、凝聚相中重金属的形态再分布以及金属形态结合能差异的综合分析，探讨了污泥高温焚烧过程中重金属挥发-凝聚的可能机理。发现金属挥发分两步进行。土壤中重金属的初始挥发主要来源于其可交换态（EXC）、碳酸盐结合态（CAR）和铁锰结合态（FM），主要由单质、氯化物、氧化物和硫化物组成。随着污泥中氯和硫含量的增加，重金属在凝聚相中发生了内部形态再分布，这是影响重金属潜在挥发性的重要因素。一部分络合态（COM）和残留态（RES）的金属物种逐渐分解为单质或离子、氧化物和碳酸盐，二次挥发性显著增强。在氯存在下，约46%的镉与RES级分消失时，镉的挥发率增加了44.89%。此外，当挥发速率增加近10%时，约9%的Pb以COM形式消失。因此，二次挥发主要是由COM和RES组分的金属物种的分解控制的。通过XRD分析和结合能计算发现，金属配合物和硅酸盐由于热稳定性差，比硫酸盐更容易在高温下分解。
In sludge incineration, the thermal behavior of heavy metal is a growing concern. In this work, the combined analysis of metal partitioning behavior between vapor phase and condensed phase, speciation redistribution in condensed phase and the difference of metal species in binding energy was carried out to investigate the possible volatilization-condensation mechanism of heavy metals in high-temperature sludge incineration. It was found that there were two steps in metal volatilization. The initial volatilization of heavy metal originated from their exchangeable (EXC), carbonate bound (CAR) and iron-manganese bound (FM) fractions, which is primarily composed of simple substance, chlorides, oxides and sulfides. With the increase of chlorine and sulfur in sludge, the inner speciation redistribution of heavy metals occurred in condensed phase, which was an important factor affecting the potential volatility of heavy metals. A partial of metal species with complexed (COM) and residual (RES) fractions gradually decomposed into simple substance or ions, oxides and carbonates, which significantly strengthened the second volatility. In presence of chlorine, about 46% of Cd with the RES fraction disappeared when the volatility rate of Cd increased by 44.89%. Moreover, about 9% of Pb with COM fraction disappeared when there was an increase of nearly 10% in the volatilization rate. Thus, the second volatilization was mainly controlled by the decomposition of metal species with COM and RES fractions. By virtue of XRD analysis and the binding energy calculation, it was found that metal complex and silicates were inclined to decompose under high temperature due to poor thermo stability as compared with sulfates.
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