|
International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 1, 2014, pp. 149-158
|
Bioline Code: st14016
Full paper language: English
Document type: Research Article
Document available free of charge
|
|
International Journal of Environment Science and Technology, Vol. 11, No. 1, 2014, pp. 149-158
en |
Recovery of chlorinated solvent trichloroethylene contaminated groundwater using a hybrid treatment system
Kao, C. M.
Abstract
In this laboratory pilot-scale study, a hybrid
treatment system has been developed to remove chlorinated
solvent trichloroethylene and fine particles
from chlorinated solvent trichloroethylene-contaminated
groundwater before it is applied for further recovery. The
two-stage system contained fiber-ball filtration followed by
nanofiltration membrane processes. The measured chlorinated
solvent trichloroethylene and suspended solids of
the tested groundwater were 850 μg/L and 1,052 mg/L,
respectively. Up to 97.3 % of chlorinated solvent trichloroethylene
and 99.9 % of SS could be removed by the
hybrid system with an operational pressure of 4.1 kg/cm2.
The chlorinated solvent trichloroethylene removal mechanism
in the fiber-ball filtration process could be due to
adsorption. Approximately 98.2 and 78.6 % of chlorinated
solvent trichloroethylene rejection was observed when
nanofiltration membrane was used for chlorinated solvent
trichloroethylene removal with the recover rate of 80 %
and initial chlorinated solvent trichloroethylene concentration
of 1 and 10 mg/L. Higher chlorinated solvent trichloroethylene
rejection can be obtained when lower
chlorinated solvent trichloroethylene concentration (1 mg/L)
was applied. High chlorinated solvent trichloroethylene
concentration (10 mg/L) would increase the pore size of
nanofiltration, which causes the decrease in chlorinated
solvent trichloroethylene rejection rate. Approximately
46.6 % of flux drop was observed when nanofiltration
membrane was used along compared to the system using
FF as the first treatment stage. This indicates that the
application of fiber-ball filtration could maintain a higher
flux of groundwater treatment. The developed fiber-ball
filtration and nanofiltration hybrid membrane system is
able to reduce the chlorinated solvent trichloroethylene and
solid concentrations to meet the water reuse and groundwater
remediation standards.
Keywords
Fiber-ball filtration; Groundwater treatment; Membrane; Nanofiltration; Trichloroethylene
|
|
© International Journal of Environment Science and Technology Alternative site location: http://www.ijest.org
|
|