Aresta M, Dibenedetto A, Fragale C, Giannoccaro P, Pastore C, Zammiello D, Ferragina C
CIRCC, METEA Research Center, Department of Chemistry, University of Bari, Via Celso Ulpiani 27, 70126 Bari, Italy.
Chemosphere. 2008 Jan;70(6):1052-8. doi: 10.1016/j.chemosphere.2007.07.074. Epub 2007 Sep 11.
This paper reports about a combined technology for soil remediation from PCBs using the thermal desorption technique coupled with the catalytic hydrogenation of recovered PCBs. The reactor is a bench scale rotating desorption furnace through which nitrogen is flushed and used as carrier gas of desorbed PCBs. The latter are condensed into an hexane or hexane-acetone (1:1 v/v) solution that is then hydrogenated using phosphate-supported Pd or Rh as catalyst. The analysis of the treated soil, under variable operative conditions (temperature and desorption time), shows that the total (99.8%) decontamination from PCBs occurs. The recovery yield of the desorbed PCBs is better than 75% and the subsequent hydrogenation reaches 63% of the collected PCBs in 5h or 100% in 12h.
本文报道了一种利用热脱附技术结合回收多氯联苯的催化氢化作用进行多氯联苯土壤修复的联合技术。该反应器是一个实验室规模的旋转脱附炉，通过它通入氮气并用作脱附多氯联苯的载气。后者被冷凝成己烷或己烷 - 丙酮（1:1 v/v）溶液，然后使用负载磷酸的钯或铑作为催化剂进行氢化。在可变操作条件（温度和解吸时间）下对处理后土壤的分析表明，多氯联苯的总去污率达到99.8%。脱附多氯联苯的回收率优于75%，随后的氢化在5小时内达到收集到的多氯联苯的63%，或在12小时内达到100%。
