不同氧化剂对某煤制气厂多环芳烃污染土壤的修复效果研究

REMEDIATION PERFORMANCE OF CHEMICAL OXIDANTS ON SOILS CONTAMINATED WITH POLYCYCLIC AROMATIC HYDROCARBONS AT A COAL GAS PLANT

利用不同化学氧化剂对某煤制气厂实际污染土壤中PAHs的修复效果进行研究,结果显示,活化过硫酸钠处理后,PAHs的整体去除率均达到90%以上,最高去除率出现在药剂投加量为8%(质量分数);高锰酸钾处理后,苯并(g,h,i)芘去除率最低45.28%,其余均大于70%;两种氧化剂均表现较好的修复效果,大部分PAHs均被氧化消除,少部分残留在土壤中,且氧化过程中受到搅拌等外界条件影响扩散至上清液及挥发到空气中的PAHs占比微少,推荐其作为修复煤制气污染场地土壤中PAHs的有效方法。

Effects of different chemical oxidants on PAHs contaminated soil of a coal gas plant was studied,results showed that,after treatment with activated persulfate,the overall removal rate of PAHs was above 90%,the highest removal rate in drug concentration of 8%; after treatment with KMn O4,benzo( g,h,i) perylene was 45. 28% of the minimum removal rate,and the rest were > 70%; this two kinds of oxidants showed good removal effect,and most of the PAHs was oxidized to eliminate,only a small part of the PAHs remained in the soil,and the PAHs diffused to supernatant and evaporated into the air was at a very small proportion,which recommended as an effective method to repair the PAHs in contaminated soil of coal gas plant.