Effect of a fluctuating water table: column study on redox dynamics and fate of some orgaic pollutants

摘要

The development of the redox conditions has been studied in an initially aerobic column filled with quartz sand coated with ferrhydrite and subjected to a fluctuating water table. The purpose of this study was to evaluate the effect of water table fluctuations on the redox dynamics and the fate of selected organic pollutants. The column that was percolated continuously with electron acceptors(O_2, NO_3, SO_4)and electron donors(acetate and formate), was first operated under saturated conditions resulting in the classical redox zonation. After 4 months of operation, we started to fluctuate the water level and three drainage-imbibition cycles were run each with a total cycle length of 1 month.