模拟淋溶场景下典型POPs废物的释放规律

以含硫丹废物(硫丹乳油生产废弃物)和含多溴联苯醚废物(废旧打印机外壳)为研究对象,分别研究了在含硫丹废物堆存和含多溴联苯醚废物简单填埋场景下的浸出动态变化规律,并采用相关模型对其浸出规律进行模拟.结果表明,在0~48 h这段时间内,硫丹和多溴联苯醚(BDE-28、BDE-47和BDE-66)的浸出量增加较多,48 h之后,渐趋稳定;整个过程的浸出速率均随时间的延长而减小;其中,累积浸出量和浸出速率大小依次为:α-硫丹>β-硫丹,BDE-47>BDE-28>BDE-66.并且α-硫丹、β-硫丹和多溴联苯醚(BDE-28、BDE-47和BDE-66)的累积浸出量随时间的变化趋势可用Elovich方程进行拟合,表明硫丹与多溴联苯醚的浸出过程是非均相扩散过程.

Releasing characteristics of typical POPs wastes by simulated leaching

Leaching characteristics of endosulfan from abandoned endosulfan emulsifiable solution and polybrominated diphenyl ethers (PBDEs) from waste printer shells were investigated in this study. The leaching kinetics of endosulfan in storage scenario and PBDEs in simple landfill scenario were studied, and related models based on the kinetics were established as well. Results indicated that the accumulative leaching quantity of endosulfan and PBDEs (BDE-28, BDE-47, BDE-66) increased rapidly with time initially. However, after 48 hours, the leaching quantity increased slowly and finally kept stable. Leaching rate decreased with time in the whole process. In addition, the leaching quantity and the leaching rate of α-endosulfan were higher than those of β-endosulfan. The leaching quantity and the leaching rate of PBDE were in the order BDE-47>BDE-28>BDE-66. The relationship between leaching time and accumulative leaching quantity of α-endosulfan, β-endosulfan, BDE-28, BDE-47, BDE-66 could be well simulated by Elovich equation. The simulation results showed that the leaching process of both endosulfan and PBDEs were heterogeneous diffusion.