采用化学螯合剂稳定化和水泥固化处理垃圾焚烧飞灰中重金属的性能比较研究。
Performance of chemical chelating agent stabilization and cement solidification on heavy metals in MSWI fly ash: A comparative study.
机构信息
Tianjin Engineering Research Center of Bio Gas/Oil Technology, State Key Laboratory of Engines, School of Environmental Science and Engineering, Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, Tianjin University, Tianjin 300072, China.
Tianjin Engineering Research Center of Bio Gas/Oil Technology, State Key Laboratory of Engines, School of Environmental Science and Engineering, Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, Tianjin University, Tianjin 300072, China.
出版信息
J Environ Manage. 2019 Oct 1;247:169-177. doi: 10.1016/j.jenvman.2019.06.089. Epub 2019 Jun 24.
Heavy metal stabilization by chemical chelating agent and solidification by cement are technologies currently used to reduce the leaching of heavy metals in municipal solid waste incineration (MSWI) fly ash. This paper studied the physico-chemical properties of the fly ash, heavy metals content in the fly ash, and the leaching concentration of the heavy metals from fly ash. The effect of four chelating agents namely dithiocarbamate (1#), dithiocarbamic acid dipotassium salt (2#), amino dithiocarbamate chelating resin (3#) and thiourea (4#) on the stabilization and leaching of heavy metals were investigated. Different addition ratios (1%, 2% and 3% w/w) of the chelating agents, various curing time (7, 14, 28 days), and different amounts of the cement (10%, 15% and 20% w/w) were used in order to find the agent with the optimum stabilization and leaching of heavy metals as well as find the effect of combining the agent and cement. The results showed that the dithiocarbamate (1#) chelating agent had the best stabilizing performance due to the three-dimensional structure after their reaction. The addition of cement to the fly ash led to the immobilization of heavy metals due to the C-S-H gel formation. The technology of cement solidification and chelating agent stabilization was optimal from the point of economic cost and the complexity aspect.
重金属的稳定化可以通过化学螯合剂和水泥的固化来实现，这是目前用于减少城市固体废物焚烧（MSWI）飞灰中重金属浸出的技术。本文研究了飞灰的物理化学性质、飞灰中重金属的含量以及重金属从飞灰中浸出的浓度。研究了四种螯合剂，即二硫代氨基甲酸盐（1#）、二硫代氨基甲酸钾盐（2#）、氨基二硫代氨基甲酸盐螯合树脂（3#）和硫脲（4#）对重金属的稳定化和浸出的影响。使用了不同的添加比例（1%、2%和 3%w/w）的螯合剂、不同的固化时间（7、14、28 天）和不同量的水泥（10%、15%和 20%w/w），以找到最佳的重金属稳定化和浸出的螯合剂，并研究了螯合剂和水泥结合的效果。结果表明，二硫代氨基甲酸盐（1#）螯合剂由于其反应后的三维结构，具有最好的稳定化性能。水泥的添加导致了重金属的固定化，这是由于 C-S-H 凝胶的形成。从经济成本和复杂性方面来看，水泥固化和螯合剂稳定化技术是最佳的。
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