Kinetic study of heavy metals Cu and Zn removal during sewage sludge ash calcination in air and N2 atmospheres
Kinetic study of heavy metals Cu and Zn removal during sewage sludge ash calcination in air and N2 atmospheres
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空气和氮气气氛下污泥灰灰煅烧去除重金属Cu和Zn的动力学研究
DOI：
10.1016/j.jhazmat.2017.12.061
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发表时间：
2018
影响因子：
13.6
通讯作者：
Yang Chen
中科院分区：
文献类型：
--
作者：
Rundong Li;Zhenyu Zhai;Yanlong Li;Tianhua Yang;Yang Chen
在污水污泥灰（SSA）热化学回收磷(P)的过程中，重金属控制是至关重要的。对于Cu、Zn等中等挥发性重金属，氯添加剂的作用较为复杂，且对温度变化较为敏感。因此，对铜和锌的去除动力学进行深入研究是必要的。因此，本文的研究考虑了不同气氛和温度下SSA煅烧脱除Cu和Zn的实验和动力学模型。结果表明，在15 min内，相同温度下空气对Cu和Zn的去除效果优于N2。结果与动力学分析一致：Cu和Zn在空气气氛中的反应活化能均低于在N2气氛中的反应活化能。此外，还计算了SSA在空气和n2气氛下高温煅烧脱除Cu和Zn的反应级数、能量和频率因子。
Heavy metal control is essential during the thermochemical recovery of phosphorus (P) from sewage sludge ash (SSA). For medium volatile heavy metals, i.e. Cu and Zn, the effect of chlorine additive was complicated and more sensitive to temperature variation. So, in the in-depth study on the removal kinetics of Cu and Zn was necessary. Thus, the studies described in this paper considered the experiments and kinetic models of Cu and Zn removal in SSA through calcination under different atmospheres and temperatures. The results showed that within 15 min, the removal of Cu and Zn was more effective at the same temperature in air than in N2. The result is consistent with kinetic analysis: Reaction activation energy of both Cu and Zn in an air atmosphere is lower than in N2. In addition, the reaction orders, energy and frequency factors of Cu and Zn removal reaction during SSA calcination at high temperature with air and N2atmosphere were calculated.