Modeling enhanced in situ denitrification in groundwater
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Abstract
A two-dimensional numerical solute transport model was developed for simulating an enhanced in situ denitrification experiment performed in a nitrate-contaminated aquifer on Cape Cod, Massachusetts. In this experiment, formate (HCOO-) was injected for a period of 26 days into the carbon-limited aquifer to stimulate denitrification. Calibration of the vertical-profile site model was demonstrated through error analysis and comparison with formate, nitrate, and nitrite concentration data monitored along a transect of three multilevel groundwater sampling wells for 75 days after initial injection. Formate utilization rates were approximately 142 and 38 μM/day for nitrate and nitrite reduction, respectively. Nitrate and nitrite utilization rates were approximately 29 and 8 μM/day, respectively. Nitrate utilization rates under enhanced conditions were 1 order of magnitude greater than previously reported naturally occurring rates. The nitrite production rate was approximately 29 μM/day. Persistence of nitrite was attributed to a combination of factors, including electron donor (formate) limitation late in the experiment, preferential utilization of nitrate as an electron acceptor, and greater nitrite production relative to nitrite utilization.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Modeling enhanced in situ denitrification in groundwater |
| Series title | Journal of Environmental Engineering |
| DOI | 10.1061/(ASCE)0733-9372(2002)128:6(491) |
| Volume | 128 |
| Issue | 6 |
| Year Published | 2002 |
| Language | English |
| Publisher | ASCE |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 14 p. |
| First page | 491 |
| Last page | 504 |
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