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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Solar-Chemical Treatment of Groundwater Contaminated with Petroleum at Gas Station Sites: Ex Situ Remediation Using Solar/TiO_2 Photocatalysis and Solar Photo-Fenton
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Solar-Chemical Treatment of Groundwater Contaminated with Petroleum at Gas Station Sites: Ex Situ Remediation Using Solar/TiO_2 Photocatalysis and Solar Photo-Fenton

机译:对加油站站点的石油污染的地下水进行日光化学处理:使用Solar / TiO_2光催化和日光Fenton进行异位修复

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摘要

Groundwater samples contaminated by BTEX (benzene, toluene, ethylbenzene, xylene isomers and TPHs (total petroleum hydrocarbons) were treated with advanced oxidation processes (AOPs), such as TiO_2 photocatalysis and Fe~(2+)/H_2O_2 exposed to solar light (37°N and 128°E) with an average intensity of 1.7 mW/cm~2 at 365 nm. These AOP processes showed feasibility in the treatment of groundwater contaminated with BTEX, TPH and TOC (Total Organic Carbon). Outdoor field tests showed that the degradation efficiency of each contaminant was higher in the Fe~(2+)/H_2O_2 system without solar light compared to the TiO_2/solar light and H_2O_2/solar light systems. However, the TiO_2/solar light and the Fe~(2+)/H_2O_2/solar light systems showed significantly enhanced efficiencies in the degradation of BTEX, TPH and TOC with the additional use of H_2O_2. Near complete degradation of BTEX and TPH was observed within 2 and 4 hrs, respectively, however, that of TOC was slower. Without pretreatment of the groundwater, fouling of the TiO_2, due to the ionic species present, was observed within 1 hr of operation, which resulted in the inhibition of further BTEX, TPH and TOC destruction. The degradation rate of n-alkanes with carbon numbers ranging from C10 to C15 was relatively greater than that of n-alknaes with carbon numbers ranging from C16 to C20. From this work, the AOP process (Fe~(2+)/H_2O_2/solar light and TiO_2/H_2O_2/solar light) illuminated with solar light was identified as an effective ex situ technique in the remediation of groundwater contaminated with petroleum.
机译:对BTEX污染的地下水样品(苯,甲苯,乙苯,二甲苯异构体和TPH(总石油烃))进行了高级氧化处理(AOP),例如TiO_2光催化和暴露于太阳光下的Fe〜(2 +)/ H_2O_2(37)。 (N和128°E),平均强度在365 nm处为1.7 mW / cm〜2,这些AOP工艺显示了对被BTEX,TPH和TOC(总有机碳)污染的地下水进行处理的可行性。在没有太阳光的Fe〜(2 +)/ H_2O_2系统中,与TiO_2 /太阳光和H_2O_2 /太阳光系统相比,每种污染物的降解效率更高,而在TiO_2 /太阳光和Fe〜(2+ )/ H_2O_2 /太阳光系统通过额外使用H_2O_2可以显着提高BTEX,TPH和TOC的降解效率,分别在2和4小时内观察到BTEX和TPH几乎完全降解,但是TOC却是较慢,无需预处理在地下水中,由于存在离子种类,在运行的1小时内观察到了TiO_2的结垢,从而进一步抑制了BTEX,TPH和TOC的破坏。碳数为C10至C15的正构烷烃的降解率相对高于碳数为C16至C20的正构烷烃的降解率。通过这项工作,AOP工艺(Fe〜(2 +)/ H_2O_2 /太阳能和TiO_2 / H_2O_2 /太阳能)被认为是修复石油污染地下水的一种有效的非原位技术。

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