Abstract
Two potential heterotrophic-autotrophic denitrification permeable reactive barriers (HAD PRBs) were evaluated to remediate groundwater in situ. The first HAD PRB (Column 1) was packed with a mixture of spongy iron, pine bark and sand between 5 and 145 cm from bottom. The second HAD PRB (Column 2) was filled with a spongy iron and sand mixture layer between 5 and 35 cm from bottom, and a pine bark layer between 35 and 145 cm from bottom. The results showed that during operation over the 45 pore volumes, the influent NO3-N concentration of ≤100 mg/L was mostly denitrified in Columns 1 and 2 at the flow rates of ≤0.30 m/d. The high NO3-N percent removals (97–100 %) for both columns were achieved at hydraulic retention times ranging from 8.75 to 17.51 d. Most of the influent NO3-N was removed in the first 25 cm at the low (23 mg/L) and middle (46 mg/L) NO3-N concentrations and in the first 65 cm at the high concentration (104 mg/L) by Columns 1 and 2. Packing structure had a negligible effect on the performance of the two columns. Both HAD PRBs were highly feasible and effective in in situ groundwater remediation.
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Abbreviations
- AD:
-
Autotrophic denitrification
- BD:
-
Biological denitrification
- BET:
-
Brunauer-Emmett-Teller
- CR:
-
Chemical reduction
- DO:
-
Dissolved oxygen
- HAD:
-
Heterotrophic-autotrophic denitrification
- HD:
-
Heterotrophic denitrification
- HRT:
-
Hydraulic retention time
- MNPR:
-
Maximum NO3-N percent removal
- MVNLR:
-
Maximum volumetric NO3-N loading rate
- PRB:
-
Permeable reactive barrier
- PV:
-
Pore volume
- SD:
-
Standard deviation
- TOC:
-
Total organic carbon
- VNLR:
-
Volumetric NO3-N loading rate
- ZVI:
-
Zero-valent iron
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Liu, F., Huang, G., Fallowfield, H., Guan, H., Zhu, L., Hu, H. (2014). Heterotrophic-Autotrophic Denitrification Permeable Reactive Barriers. In: Study on Heterotrophic-Autotrophic Denitrification Permeable Reactive Barriers (HAD PRBs) for In Situ Groundwater Remediation. SpringerBriefs in Water Science and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-38154-6_3
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DOI: https://doi.org/10.1007/978-3-642-38154-6_3
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