University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Dorothea Summer
(2015):
Säulenversuche mit nullwertigem Eisen zur Entfernung von Trichlorethylen, Arsen und Nickel aus Wasser.
Master / Diploma Thesis - Institut für Bodenforschung (IBF),
BOKU-Universität für Bodenkultur,
pp 80.
UB BOKU
obvsg
- Abstract:
- Worldwide groundwater is endangered due to pollution. Three noxious, common groundwater pollutants are trichloroethylene (TCE), arsenic and nickel. They can enter the groundwater via anthropogenic sources, however nickel and arsenic contaminations can also occur due to increased geogenic background. A permeable barrier is a technology for in-situ groundwater remediation and shows several Advantages compared to traditional remediation methods. A permeable barrier is placed into the subsurface perpendicular to the polluted groundwater plume, which passes the barrier passively. Zero-valent iron (ZVI) has the ability to immobilize nickel and arsenic via adsorption and cementation and to reductively dechlorinate TCE. To investigate the suitability of ZVI as a barrier material column experiments were conducted and in advance a suitable experimental set up was developed. A mixture of quartz sand and granular iron was placed into glass columns and contaminated water was pumped through them. To study the influences of the organic and inorganic contaminants the columns were divided into three groups: one with a TCE solution, one with a nickel-arsenic solution and one with a TCE-nickel-arsenic solution. There was no contaminant breakthrough in all three columns during the whole duration of the experiment. For all three contaminants in all column groups removal rates of ≥99% could be achieved and drinking water thresholds could be reached. No significant difference could be detected between the column groups. Although a trend of a faster TCE removal at the beginning in the presence of nickel was detected. Changes of the column material could be detected at the entries of the columns as a consequence of corrosion of the iron and throughout the whole column as film formation, probably lime.
- Beurteilende(r):