Denitrification of nitrified and non-nitrified swine lagoon wastewater in the suspended sludge layer of treatment wetlands
| Autor: | Matias B. Vanotti, Patrick G. Hunt, Thomas F. Ducey, T. A. Matheny, Kenneth C. Stone, M. E. Poach |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
geography
Environmental Engineering geography.geographical_feature_category Denitrification biology Environmental engineering Wetland Bulrush Management Monitoring Policy and Law biology.organism_classification chemistry.chemical_compound Nitrate chemistry Wastewater Anaerobic lagoon Environmental science Sewage treatment Nitrification Nature and Landscape Conservation |
| Zdroj: | Ecological Engineering. 35:1514-1522 |
| ISSN: | 0925-8574 |
| Popis: | One method for managing livestock-wastewater N is the use of treatment wetlands. The objectives of this study were to (1) assess the magnitude of denitrification enzyme activity (DEA) in the suspended sludge layers of bulrush and cattail treatment wetlands, and (2) evaluate the impact of nitrogen pretreatment on DEA in the suspended sludge layer. The study used four wetland cells (3.6 m × 33.5 m) with two cells connected in series. Each wetland series received either untreated or partially nitrified swine wastewater from a single-cell anaerobic lagoon. The DEA of the suspended sludge layers of the constructed wetlands was measured by the acetylene inhibition method. The control DEA treatment for the sludge layer had a mean rate of 18 gN 2O-N g−1 sludge h−1. Moreover, the potential DEA (nitrate-N and glucose-C added) mean was very large, 121 gN 2O-N g −1 sludge h −1 . These DEA rates are consistent with the previously reported high levels of nitrogen removal by denitrification from these wetlands, especially when the wastewater was partially nitrified. Stepwise regression using distance within the wetland, wastewater nitrate, and wastewater ammonia explained much of the variation in DEA rates. In both bulrush and cattail wetlands, there were zones of very high potential DEA. Published by Elsevier B.V. |
| Databáze: | OpenAIRE |
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