Influence of nanoscale zero-valent iron on geochemical properties of groundwater and vinyl chloride degradation: A field case study.
A 200m(2) pilot-scale field test successfully demonstrated the use of nanoscale zero-valent iron (NZVI) for effective remediation of groundwater contaminated with chlorinated organic compounds in Taiwan within six months. Both commercially available and on-site synthesized NZVI were used. A well-defined monitoring program allowing to collect three-dimensional spatial data from 13 nested multi-level monitoring wells was conducted to monitor geochemical parameters in groundwater. The degradation efficiency of vinyl chloride (VC) determined at most of monitoring wells was 50-99%. It was found that the injection of NZVI caused a significant change in total iron, total solid (TS) and suspended solid (SS) concentrations in groundwater. Total iron concentration showed a moderate and weak correlation with SS and TS, respectively, suggesting that SS may be used to indicate the NZVI distribution in groundwater. A decrease in oxidation-reduction potential (ORP) values from about -100 to -400mV after NZVI injection was observed. This revealed that NZVI is an effective means of achieving highly reducing conditions in the subsurface environment. Both VC degradation efficiency and ORP showed a correlative tendency as an increase in VC degradation efficiency corresponded to a decrease of ORP. This is in agreement with the previous studies suggesting that ORP can serve as an indicator for the NZVI reactivity.
Wei
Yu-Ting
YT
Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan, ROC.
Wu
Shian-Chee
SC
Chou
Chih-Ming
CM
Che
Choi-Hong
CH
Tsai
Shin-Mu
SM
Lien
Hsing-Lung
HL
D006843:Hydrocarbons, Chlorinated / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000458:organization & administration*; D013624:Taiwan; D014752:Vinyl Chloride / Q000737:chemistry*; D014872:Water Movements
D006843:Hydrocarbons, Chlorinated; D014752:Vinyl Chloride