Effects of Dissolved Compounds in Groundwater on TCE Degradations Reaction by Nanoscale Zero-Valent Iron
Year: 2011
Type: article
Abstract: Nanoscale zero-valent iron (NZVI) particles were tested as remediation media for groundwater contaminated by organic pollutants (e.g., TCE, trichloroethylene).The contaminated groundwater contained anions (NO3 -, Cl -, SO4 2-, and HCO3 -) and natural organic matter (NOM).Treatability of commercial NZVI particles (NANOFER 25, Nanoiron, Czech) was tested by using a synthetic groundwater and the field groundwater samples.More than 95% of 1.8 mM TCE was removed within 20 hours with a NZVI dosage of 25 g/L (k = 0.15 hr -1 ).Repetitive degradation experiments revealed that the removal capacity of NANOFER 25 was 0.19 mmole TCE/g NZVI.TCE degradation reactions were not substantially affected by the presence of each anion with concentrations as high as 100 times the average field concentrations.However, when the four anions (NO3 -, Cl -, SO4 2-, HCO3 -) were present simultaneously.the degradation reactivity and removal capacity were decreased by 60% (k = 0.069 hr -1) and 10%, respectively.The k value of TCE degradation in the presence of NZVI (25 g/L) with dissovled organic carbon of 2.5 mg/L was also decreased by 84% (k = 0.025 hr -1).In the experiments with the field groundwater, more than 90% of 1.8 µM TCE, which is the concentration of TCE at the source zone, was removed within 10 hours with a NANOFER 25 dosage of 25 g/L.The results imply that the contaminated groundwater can effectively be treated by NANOFER 25 with more information on the hydrogeology of the site.
Source: 대한환경공학회지
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2063355733