草木灰协同热脱附修复多环芳烃污染土壤

Synergistic Thermal Desorption of Plant Ash for Remediation of PAH Contaminated Soil

本文采用玉米草木灰协同热脱附修复菲和芘污染土壤,考察了不同温度和时间下的协同热脱附效果,探究了最优技术参数,并分析了热脱附前后土壤的小麦萌发特性。结果表明:草木灰协同热脱附修复的效果与温度和污染物性质相关,温度为100、200、300℃时,添加草木灰均能促进土壤中Phe的去除,但仅在300℃时能促进土壤中芘的去除。200℃时,去除土壤中菲的最优草木灰投加量为5%,该条件下土壤中菲的去除过程可加速48%,去除率可提高11.53%。与单一热处理相比,添加5%草木灰处理后土壤的小麦发芽、根生长和芽伸长无明显变化或略有提高。

In this paper,we investigated the effect of synergistic thermal desorption of Phe and pyrene contaminated soil by using the plant ash of corn stalks,explored the optimal technical parameters at different temperatures and times,and analyzed the wheat sprouting characteristics of the soil before and after thermal desorption.The results showed that the effect of plant ash synergistic thermal desorption remediation was related to the desorption temperature and the characteristics of pollutants,and the addition of plant ash could promote the removal of Phe from soil at 100,200 and 300℃,but only could promote the removal of pyrene from soil at 300℃.In 200℃,the optimal plant ash dosage for the removal of Phe from soil was 5%,under this condition,the removal process of phenanthrene from soil was accelerated by 48%and the removal efficiency was increased by 11.53%e.There was no significant change or slight improvement in wheat germination,root growth and shoot elongation in the soil treated by thermal desorption with 5%plant ash added compared to the soil treated with thermal desorption alone.