Thesis
High rates of ammonia removal in constructed treatment wetland mesocosms using oxygenation
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/103088
Abstract
Despite the potential for oxygenation to enhance ammonia removal in constructed wetlands, little investigation has been published on the topic. In this study, two oxygenated and two control surface flow wetland mesocosms (0.258 m2) were constructed with Typha plants. All mesocosms received a synthetic wastewater with 20 mg/L COD and 10 mg/L NH3-N, were operated at 5 and 2.5 day hydraulic retention times (HRT), and the oxygenated mesocosms were oxygenated to 14.0 mg/L DO for >6 HRT and subsequently to 5.4 mg/L DO. Percent ammonia removals and area-based removal rate constants were typical for treatment wetlands in the control mesocosms (5 day HRT, 11.6 ± 4.7% and 2.06 ± 0.84 m/year; 2.5 day HRT, -1.6 ± 10.7% and -0.32 ± 3.55 m/year), but were significantly higher in the oxygenated mesocosms (5 day HRT and 14.0 mg/L DO, 94.0 ± 2.0% and 48.87 ± 5.26 m/year; 2.5 day HRT and 14.0 mg/L DO, 83.3 ± 10.0% and 57.67 ± 19.99 m/year; 2.5 day HRT and 5.4 mg/L DO, 76.1 ± 1.9% and 45.47 ± 2.58 m/year). Generated nitrate in the oxygenated mesocosms accounted for 96.2 ± 7.3%% and 80.1 ± 16.0% of removed ammonia minus loss in total nitrogen for the 5 day HRT and 2.5 day HRT respectively, implying ammonia removal by nitrification.
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Details
- Title
- High rates of ammonia removal in constructed treatment wetland mesocosms using oxygenation
- Creators
- Huckleberry Richardson Palmer
- Contributors
- Marc W. Beutel (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525166701842
- Language
- English
- Resource Type
- Thesis