Bench-Scale Flushing Experiments for Remediation of Hg-Contaminated Groundwater

Table 3

Column properties.

Column	SS-DI	PA-DI	PA-TW	LA-DI1	LA-DI2	LA-TW
Sediment	Silica sand (SS)	Perched aquifer (PA)	Perched aquifer (PA)	Lower aquifer (LA)	Lower aquifer (LA)	Lower aquifer (LA)
Source water	Deionized water (DI)	Deionized water (DI)	Treated water (TW)	Deionized water (DI)	Deionized water (DI)	Treated water (TW)
Mass of sediment (kg)	3.52	5.35	5.73	5.26	5.43	5.70
Estimated pore water volume (cm^3)		1000	800	835	835	835
Porosity	0.30	0.34	0.27	0.29	0.29	0.29
Elapsed	26	26	26	26	26	26
Cumulative pore volume (PV) flushed	16.30	10.72	10.63	10.96	10.94	10.51

was only half filled with silica sand; thus pore volume is less than other columns.
elapsed days 16 and 17, pumping was stopped for the duration of 18 days. Thus, the total column operation period was 26 + 18 = 44 days.