张瑞娜2,
胡济民1,
吴亭亭1,
1.华东理工大学煤气化及能源化工教育部重点实验室，上海 200237
2.上海环境卫生工程设计院有限公司，上海 200232
Influence of sulfur and sulfide on migration and distribution of lead in waste incineration process
XU Haoran1,,ZHANG Ruina2,
HU Jimin1,
WU Tingting1,
1.Key Laboratory of Coal Gasification and Energy Chemical Engineering, Ministry of Education, East China University of Science and Technology， Shanghai 200237, China
2.Shanghai Environmental Sanitation Engineering Design Institute Co.Ltd., Shanghai 200232, China
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摘要:为考察单质(S)、硫化钠(Na2S)和硫酸钠(Na2SO4)对垃圾焚烧过程中重金属铅(Pb)迁移分布的影响，采用ICP-AES测量重金属浓度，并选用HSC Chemistry软件模拟反应进程以及SEM观察反应后微观形貌。结果表明，硫和硫化物对Pb的挥发具有2个方面的影响。一方面，加入的硫和硫化物能够与Pb发生化学反应生成不易挥发的Pb硫酸盐，降低其挥发；另一方面，硫和硫化物的加入形成钠硫酸盐，具有助熔效果，能够降低灰渣的熔点，易于Pb的挥发。受这2个方面因素的综合影响，加入硫和硫化物后，重金属Pb的挥发率高低依次为Na2SO4>Na2S>单质硫。同时还发现，当温度从600 ℃升至900 ℃时，生成的Pb硫酸盐逐渐分解，助熔效果增强，硫和硫化物降低Pb挥发的效果减弱。
关键词: 垃圾焚烧二次污染/
焚烧无害化处理/
热力学模拟/
铅迁移分布/
硫和硫化物
Abstract:In this study, the effects of sulfer (S), sodium sulfide (Na2S) and sodium sulphate (Na2SO4) on the migration and distribution of heavy metal (Pb) in the waste incineration process were investigated. ICP-AES was used to measure the concentration of heavy metal. HSC Chemistry software and SEM were used to simulate the reaction process, identify the microstructure of fly ash, respectively. The result shows that sulfur and sulfide addition could reduce or promote Pb volatilization. On the one hand, a chemical reaction occurred between Pb and the additives of sulfur and sulfide, and a non-volatile salt of PbSO4 was formed, which reduced Pb volatilization. On the other hand, the addition of sulfur and sulfide led to the formation of Na2SO4, which facilitated the melting of the ash, reduced its melting point and promoted Pb volatilization. Influenced by above two factors, the volatilization rate of Pb was Na2SO4 > Na2S > S after sulfur and sulfides addition. Moreover, as the temperature increased from 600 ℃ to 900 ℃, the formed PbSO4 decomposed, the effect of melting facilitation increased, Pb volatilization reduction became weak accordingly.
Key words:secondary pollution in waste incineration/
incineration harmless treatment/
thermodynamic simulation/
migration and distribution of Pb/
sulfur and sulfide.
| [1] | 石德智. 基于新型分类收集系统的生活垃圾焚烧过程污染物控制及其机理研究[D]. 杭州： 浙江大学, 2009. |
| [2] | SHI D Z. Effect of MSW source-classified collection on the emission of PCDDs/Fs and heavy metals from incineration in China[J]. Journal of Hazardous Materials, 2008, 153: 685-694. |
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硫和硫化物对垃圾焚烧过程中Pb迁移分布的影响
徐浩然1,,张瑞娜2,
胡济民1,
吴亭亭1,
1.华东理工大学煤气化及能源化工教育部重点实验室，上海 200237
2.上海环境卫生工程设计院有限公司，上海 200232
基金项目:
关键词: 垃圾焚烧二次污染/
焚烧无害化处理/
热力学模拟/
铅迁移分布/
硫和硫化物
摘要:为考察单质(S)、硫化钠(Na2S)和硫酸钠(Na2SO4)对垃圾焚烧过程中重金属铅(Pb)迁移分布的影响，采用ICP-AES测量重金属浓度，并选用HSC Chemistry软件模拟反应进程以及SEM观察反应后微观形貌。结果表明，硫和硫化物对Pb的挥发具有2个方面的影响。一方面，加入的硫和硫化物能够与Pb发生化学反应生成不易挥发的Pb硫酸盐，降低其挥发；另一方面，硫和硫化物的加入形成钠硫酸盐，具有助熔效果，能够降低灰渣的熔点，易于Pb的挥发。受这2个方面因素的综合影响，加入硫和硫化物后，重金属Pb的挥发率高低依次为Na2SO4>Na2S>单质硫。同时还发现，当温度从600 ℃升至900 ℃时，生成的Pb硫酸盐逐渐分解，助熔效果增强，硫和硫化物降低Pb挥发的效果减弱。
English Abstract
Influence of sulfur and sulfide on migration and distribution of lead in waste incineration process
XU Haoran1,,ZHANG Ruina2,
HU Jimin1,
WU Tingting1,
1.Key Laboratory of Coal Gasification and Energy Chemical Engineering, Ministry of Education, East China University of Science and Technology， Shanghai 200237, China
2.Shanghai Environmental Sanitation Engineering Design Institute Co.Ltd., Shanghai 200232, China
Keywords: secondary pollution in waste incineration/
incineration harmless treatment/
thermodynamic simulation/
migration and distribution of Pb/
sulfur and sulfide
Abstract:In this study, the effects of sulfer (S), sodium sulfide (Na2S) and sodium sulphate (Na2SO4) on the migration and distribution of heavy metal (Pb) in the waste incineration process were investigated. ICP-AES was used to measure the concentration of heavy metal. HSC Chemistry software and SEM were used to simulate the reaction process, identify the microstructure of fly ash, respectively. The result shows that sulfur and sulfide addition could reduce or promote Pb volatilization. On the one hand, a chemical reaction occurred between Pb and the additives of sulfur and sulfide, and a non-volatile salt of PbSO4 was formed, which reduced Pb volatilization. On the other hand, the addition of sulfur and sulfide led to the formation of Na2SO4, which facilitated the melting of the ash, reduced its melting point and promoted Pb volatilization. Influenced by above two factors, the volatilization rate of Pb was Na2SO4 > Na2S > S after sulfur and sulfides addition. Moreover, as the temperature increased from 600 ℃ to 900 ℃, the formed PbSO4 decomposed, the effect of melting facilitation increased, Pb volatilization reduction became weak accordingly.
