| Uptake of 15N by macrophytes in subsurface-flow wetlands treating domestic wastewater. | |
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MedLine Citation:
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PMID: 11506208 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Constructed subsurface-flow wetlands are becoming more common for on-site treatment of domestic wastewater to provide secondary quality effluent. Macrophytes are generally added to wetlands to increase treatment efficiency but their role in reducing N content is controversial. Our investigation utilized two subsurface-flow wetlands to determine the efficiency of different macrophytes in uptake of 15N labeled ammonium sulfate. Macrophytes in Wetland 1 recovered 35% of the added N in their shoots but only 5% of the added N was recovered in the shoots and roots in Wetland 2. A major difference for the two wetlands was N and hydraulic loadings. Wetland 1 received 7.5 Kg N ha(-1)d(-1) and Wetland 2 received 16.9 Kg N ha(-1)d(-1). Retention time for Wetland 1 based on pore volumes was 2.9 d and for Wetland 2 it was 1.2 d. The retardation factor for NH4+ was approximately 2.5 for both wetlands and the breakthrough curves indicated lack of plug flow. The importance of macrophytes in taking up NH4 appeared to dependent on N and hydraulic loadings. |
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Authors:
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R W Weaver; J J Lane; M J Johns; B J Lesikar |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental technology Volume: 22 ISSN: 0959-3330 ISO Abbreviation: Environ Technol Publication Date: 2001 Jul |
Date Detail:
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Created Date: 2001-08-16 Completed Date: 2001-12-19 Revised Date: 2007-03-21 |
Medline Journal Info:
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Nlm Unique ID: 9884939 Medline TA: Environ Technol Country: England |
Other Details:
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Languages: eng Pagination: 837-43 Citation Subset: IM |
Affiliation:
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Department of Soil & Crop Sciences, Texas A&M University, College Station 77843-2474, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Ecosystem Eutrophication* Nitrogen / metabolism, pharmacokinetics* Nitrogen Isotopes / pharmacokinetics Plants* Waste Disposal, Fluid* Water Movements |
| Chemical | |
Reg. No./Substance:
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0/Nitrogen Isotopes; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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