HDTMA改性粘土吸附固定沉积物间隙水中多环芳烃的模拟研究

Simulation of polycyclic aromatic hydrocarbons in pore water adsorbed on HDTMA modified clay

选用经过十六烷三甲基溴化铵(HDTMA-Br)改性的粘土矿物为吸附剂,探讨其对水中多环芳烃类有机污染物的吸附性能。结果表明,HDTMA改性土吸附固定水中多环芳烃的能力比天然沉积物要高得多且吸附稳定。本文还讨论了环境温度、pH值、盐度、振荡时间、污染物初始浓度以及投土量对吸附性能的影响以确定吸附的适宜条件。根据实验结论,将HDTMA改性土投到实际间隙水样品中,经过充分的吸附,结果显示,经HDTMA改性粘土吸附后的间隙水中多环芳烃的含量均在检出线以下,说明HDTMA改性土可以有效地吸附固定沉积物间隙水中的多环芳烃,降低其迁移性,防止其释放产生二次污染。

Polycyclic aromatic hydrocarbons （PAHs） in sediments have become the main pollution source of the food cycle. The pore water in sediments is a channel through which the contamination can transfer, so the contents of PAHs in pore water are important to the related research of the native pollution. In this paper, sorption and immobility of PAHs in water are discussed. The sorbent is HDTMA modified clay. The results show that HDTMA modified clay can much more effectively adsorb PAHs from water and stably than the nature sediments. It can be predicated that HDTMA modified clay can stabilize PAHs in pore water in stead of nature sediments. Based on the results, HDTMA modified clay is added to practical pore water contained PAHs determined. After enough time, the contents of PAHs in pore water were not detected. It can be concluded that PAHs in pore water, with its transference being depressed, can be adsorbed and immobilized effectively by HDTMA modified clay, so the second pollution can be avoided.