【摘要】 开展了水泥和螯合剂协同处置全烧垃圾循环流化床炉飞灰的研究,并对经济性进行了分析。实验结果表明,当水泥添加比例为30%时,重金属的浸出毒性均低于生活垃圾填埋污染物控制标准的规定。有机硫螯合剂TMT(三巯基均三嗪三钠盐类)对Cu、Pb、Cd的稳定效果最好,有机硫螯合剂DTCR(二硫代氨基甲酸盐衍生物)以Cu、Pb最佳,同等有效添加量时TMT的稳定效果优于DTCR,完全达标时二者所需的添加量分别为2%和3%。水泥和螯合剂协同处置时,满足生活垃圾填埋标准的水泥和螯合剂之间的用量关系并非为线性。螯合剂在实现减容化的同时,存在成本提高的问题,以DTCR为例,在兼顾经济性和增容性时水泥用量可以控制在20%,稳定剂为1.75%。更多还原

【Abstract】 The study presents the treatment of fly ash generated from totally incinerated municipal solid waste by circulating fluidized bed incinerator combing cement solidification and chelating agent stabilization.And,the economic analysis was also discussed. The results showed that the solidification matrix with 30% cement could reduce the leaching toxicity far below the standard for pollution control on the landfill site of municipal solid waste. Trimercapto-s-triazine( TMT) and sodium dithiocarbamate( DTCR) exhibited an effective stabilization of Cu,Pb,Cd and Cu,Pb,respectively,and the immobilization effect of TMT was better than DTCR with the same dosage. The dosages of the two cheating agents to meet the standard of the landfilling standard were 2% and 3%. In the process of co-stabilization,the relationship between the cement addition and agent dosage was not linear when satisfying the landfilling requirement. The chelating agent could avoid the obvious compatibilization,but it posed a remarkable increase of treatment cost. Economic analysis for DTCR indicated that to strike a balance between economy and compatibilization,the cement addition and agent dosage could be controlled at 20% and 1. 75%.更多还原