Slowly released molasses barrier system for controlling nitrate plumes in groundwater: A pilot-scale tank study

•A well-type barrier system with solidified molasses was studied for NO3 removal.•Removal efficiency for 142mgL−1 of NO3 was 79–84% at the pilot-scale tank.•Pore clogging and hydraulic disturbance were not evident in the barrier system. A well-type barrier system containing solidified molasses as a...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2014-02, Vol.97, p.135-139
Main Authors: Lee, Byung Sun, Lee, Kyuyeon, Um, Jae Yeon, Nam, Kyoungphile
Format: Article
Language:English
Subjects:
Applied sciences
Denitrification
Environmental Restoration and Remediation - methods
Exact sciences and technology
Groundwater - chemistry
Groundwaters
Heterotrophic denitrification
Molasses
Natural water pollution
Nitrate
Nitrates - chemistry
Nitrite reductase
Nitrite Reductases - analysis
Pollution
Slowly released molasses
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water treatment and pollution
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Summary:•A well-type barrier system with solidified molasses was studied for NO3 removal.•Removal efficiency for 142mgL−1 of NO3 was 79–84% at the pilot-scale tank.•Pore clogging and hydraulic disturbance were not evident in the barrier system. A well-type barrier system containing solidified molasses as a reactive medium was developed to promote the indigenous denitrifying activity and to treat nitrate plumes in groundwater. Three slowly released molasses (SRM) barrier systems harboring 60, 120, and 120 SRM rods, which were named System A, B, and C, respectively, were operated to examine nitrate removal efficiency in a pilot-scale sandy tank. These SRM systems induced a consistent removal of nitrate without pore clogging and hydraulic disturbance during the test period. The initial nitrate concentration was 142mgL−1, and the concentrations decreased by 80%, 84%, and 79% in System A, B, and C, respectively. In particular, System C was inoculated with heterotrophic denitrifiers, but the nitrate removal efficiency was not enhanced compared to System B, probably due to the prior existence of indigenous denitrifiers in the sandy tank. The presence of nitrite reductase-encoding gene (i.e. nirK) at the site was confirmed by denatured gradient gel electrophoresis analysis.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2013.10.088