滴滴涕农药高温热残留特性

为探明滴滴涕农药的热处理特性，利用高温管式炉，对600～1 200 ℃7个温度段下的滴滴涕农药在残渣和尾气中的残留进行了研究.结果表明:在800 ℃时，DDT去除率(η_DDT)≥99%，在1 100 ℃时，η_DDT≥99.9%.在残渣中，DDT是主要的农药残留物，其中p,p′-DDD占残渣中DDTs总量的比例在温度≤1 000 ℃时随温度升高而增加，但在温度＞1 000 ℃后却随温度升高而递减.在尾气中，p,p′-DDE随温度升高逐渐成为尾气中的主要残留物.除DDTs之外，在温度≤600 ℃的尾气中，有机物残留物多为脂肪烃；在700～900 ℃的尾气中，兼有芳烃衍生物和脂肪烃；而在1 000～1 200 ℃的尾气中，残留物则多为芳烃衍生物. 

Thermal Treatment Residue Characteristics of DDT Pesticide

In order to verify the thermal treatment residue characteristics of DDT pesticide,a high temperature tube furnace was used to study the residues of the DDT in the slag and tail gas after thermal treatment under seven temperature levels(600-1200 ℃).The results showed that the removal efficiency of DDT(ηDDT) could reach 99% after thermal treatment with the temperature of 800 ℃,and it could reach up to 99.9% when the temperature of the furnace tube was 1100 ℃.DDT was the main pesticide residue in the slag.As the temperature rose,the percentage of p,p′-DDD in DDT in the slag increased at first but then decreased;the boundary temperature was 1000 ℃.As for the tail gas,p,p′-DDE was the main remnant,the percentage of which out of total DDT increased with the increase of temperature.Besides DDT,there were other organic compounds in the tail gas.When the temperature was below 600 ℃,aliphatic hydrocarbons were the predominant organic remains.Otherwise,there were both aliphatic hydrocarbons and aromatic hydrocarbons in the tail gas under 700-900 ℃.In the range of 1000-1200 ℃,aromatic hydrocarbons became the main remains in the tail gas.