Cho Ii-Hyoung, Kim Young-Gyu, Yang Jae-Kyu, Lee Nae-Hyun, Lee Seung-Mok
New Town Development Division, Gyeonggi Innovation Corporation, Kwandong University, Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006;41(3):457-73. doi: 10.1080/10934520500428336.
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(2)O(2) exposed to solar light (37 degrees N and 128 degrees 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(2)O(2) system without solar light compared to the TiO(2)/solar light and H(2)O(2)/solar light systems. However, the TiO(2)/solar light and the Fe(2+)/H(2)O(2)/solar light systems showed significantly enhanced efficiencies in the degradation of BTEX, TPH and TOC with the additional use of H(2)O(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(2)O(2)/solar light and TiO(2)/H(2)O(2)/solar light) illuminated with solar light was identified as an effective ex situ technique in the remediation of groundwater contaminated with petroleum.
受苯系物（苯、甲苯、乙苯、二甲苯异构体）和总石油烃（TPHs）污染的地下水样本，采用了高级氧化工艺（AOPs）进行处理，如二氧化钛光催化和在北纬37度、东经128度处平均光强为1.7 mW/cm²（365纳米）的太阳光照射下的Fe(2+)/H(2)O(2)工艺。这些高级氧化工艺在处理受苯系物、总石油烃和总有机碳（TOC）污染的地下水方面显示出可行性。户外现场测试表明，与TiO(2)/太阳光和H(2)O(2)/太阳光系统相比，在无太阳光的Fe(2+)/H(2)O(2)系统中，每种污染物的降解效率更高。然而，TiO(2)/太阳光和Fe(2+)/H(2)O(2)/太阳光系统在额外使用H(2)O(2)时，对苯系物、总石油烃和总有机碳的降解效率显著提高。分别在2小时和4小时内观察到苯系物和总石油烃几乎完全降解，然而，总有机碳的降解较慢。在未对地下水进行预处理的情况下，运行1小时内就观察到由于存在的离子物种导致二氧化钛发生污染，这导致对苯系物、总石油烃和总有机碳的进一步破坏受到抑制。碳数范围为C10至C15的正构烷烃的降解速率相对大于碳数范围为C16至C20的正构烷烃。通过这项工作，太阳光照射的高级氧化工艺（Fe(2+)/H(2)O(2)/太阳光和TiO(2)/H(2)O(2)/太阳光）被确定为修复受石油污染地下水的一种有效的异位技术。
