| 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 ??M/day for nitrate and nitrite reduction, respectively. Nitrate and nitrite utilization rates were approximately 29 and 8 ??M/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 ??M/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. |
| Genre: | Article |
| ProdID: | 70024480 |
| Citation Author: | Killingstad, M. W.; Widdowson, M. A.; Smith, R. L. |
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| Citation End Page: | 504 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Environmental Engineering |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Modeling enhanced in situ denitrification in groundwater; 2002; Article; Journal; Journal of Environmental Engineering; Killingstad, M. W.; Widdowson, M. A.; Smith, R. L. |
| Citation Start Page: | 491 |
| Citation Volume: | 128 |
| Citation Year: | 2002 |
| Type: | citation/reference |
| Text: | Modeling enhanced in situ denitrification in groundwater; 2002; Article; Journal; Journal of Environmental Engineering; Killingstad, M. W.; Widdowson, M. A.; Smith, R. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1061/(ASCE)0733-9372(2002)128:6(491) |
| Date Other: | Tue, 1 Jan 2002 00:00 -0600 |
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