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首页> 外文期刊>Journal of Environmental Science and Health >Effect of sorption on contaminant oxidation in activated persulfate systems
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Effect of sorption on contaminant oxidation in activated persulfate systems

机译：吸附对活化过硫酸盐系统中污染物氧化的影响

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Sorption of hydrophobic contaminants to soils and subsurface solids is a significant limitation for the in situ chemical oxidation (ISCO) remediation of contaminated sites. A recently developed ISCO reagent, activated persulfate, was investigated for its potential to provide enhanced treatment of sorbed contaminants, a phenomenon that has previously been observed in catalyzed H_2O_2 propagations (CHP; modified Fenton's reagent). Perchloroethylene (PCE) and hexachlorocyclopentadiene (HCCP) were sorbed to diatomaceous earth and treated with CHP, iron (II)-citrate-activated persulfate, and base-activated persulfate. Gas-purge desorption was used to measure the maximum natural rate of desorption of the compounds. Enhanced treatment of both sorbed probe compounds was observed in CHP reactions, with PCE and HCCP destruction occurring more rapidly than their respective rates of gas-purge desorption. However, probe compound loss in both formulations of activated persulfate was equal or less than the rates of gas-purge desorption, indicating that enhanced treatment of the sorbed contaminants did not occur in the persulfate reactions. Activated persulfate treatment is likely ineffective for hydrophobic compounds that are sorbed to soils and subsurface solids, and is probably more effective for compounds that are not limited by desorption.
机译：疏水性污染物向土壤和地下固体的吸附是对污染场地进行原位化学氧化（ISCO）修复的重要限制。研究了最近开发的ISCO试剂活化过硫酸盐具有增强吸附污染物处理的潜力，这种现象以前在催化的H_2O_2扩散（CHP；改良的Fenton试剂）中已经观察到。将全氯乙烯（PCE）和六氯环戊二烯（HCCP）吸附到硅藻土上并用CHP，柠檬酸铁（II）活化的过硫酸盐和碱活化的过硫酸盐进行处理。气体吹扫解吸用于测量化合物的最大自然解吸速率。在CHP反应中，两种吸附的探针化合物的处理得到了增强，与PCE和HCCP破坏相比，它们的吹扫脱附速率更快。但是，两种活化过硫酸盐制剂中的探针化合物损失均等于或小于气体吹扫脱附的速率，这表明在过硫酸盐反应中并未发生对吸附的污染物的增强处理。活化的过硫酸盐处理对于吸附到土壤和地下固体中的疏水性化合物可能无效，而对于不受解吸限制的化合物可能更有效。

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