固定化菌剂载体材料腐解产物对污染土壤中芘解吸的影响

Effect of Decomposing Products of Immobilized Carries on Desorption of Pyrene in Contaminated Soil

以老化120 d初始浓度为20 mg·kg-1的人为芘污染土壤为研究对象,利用批量吸附-解吸实验,分析了固定化菌剂载体材料玉米芯腐解产物(水溶性和非水溶性)对污染土壤芘解吸的影响.结果表明:1腐解产物的加入不仅提高了土壤中芘的快速解吸分数,而且大大增加了土壤中芘的解吸率.腐解1 d和120 d非水溶性腐解产物的加入使土壤芘解吸率由20.0%分别增大到81.8%和84.5%;腐解1 d和120 d水溶性腐解产物的加入使土壤芘解吸率由约40.0%分别增大到89.6%和88.5%.2与未腐解玉米芯吸附量相比,腐解1 d和120 d的玉米芯对芘的吸附量分别增大了9.4和16.6倍.而腐解1 d和120 d后获得的水溶性产物能够使XAD-2树脂吸附量增加1.5和3.1倍.以上结果表明固定化材料可以通过吸附或活化作用促进土壤残留污染物的释放.

Batch experiments were conducted to investigate the effect of soluble and insoluble decomposing products (decomposed for 1 day and 120 day; noted by DP1 and DP120, respectively) from immobilized carriers (corncob) on the desorption of pyrene in PAH-contaminated soil (120 d ageing, 20 mg·kg - 1 ). It was found that①adding decomposing products of immobilized carriers could not only increase the rapidly desorbing fraction, but also improve the desorption rate of pyrene. The desorption rates of pyrene increased from 20% to 81. 8% and 84. 5% because of adding insoluble DP1 and DP120, and from 40% to 89. 6% and 88. 5% because of adding soluble DP1 and DP120. ② The sorption amounts of pyrene by insoluble DP1 and DP120 were 9. 4 and 16. 6 times higher than that by natural corncob, respectively. The sorption amounts of XAD-2 resins were increased by 1. 5 and 3. 1 times due to the added soluble DP1 and DP120, respectively. These results indicated that decomposing products of immobilized carries could improve the desorption of pyrene by sorption or activation in contaminated soil.