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A constructed vertical macrophyte system for the retention of nitrogen in agricultural runoff
2000 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 21, no 2, 217-223 p.Article in journal (Refereed) Published
Abstract [en]

Recent evidence for the importance of luxury rhizome accumulation of N by the common reed Phragmites australis opens the possibility for N retention in constructed vertical wetlands. The removal of nutrients (N and P) from agricultural runoff was investigated in columns planted with P. australis in a sand bed. Nitrate demonstrated a Linear removal with detention time (60-300 min) and was accounted for by membrane-Limited root uptake. Ammonia was effectively removed from agricultural runoff, with nitrate removed at longer detention times. Detention time based on a targeted nitrate removal therefore represents a suitable design parameter for a vertical macrophyte system. On the other hand, ammonia was more effectively removed at low concentrations, but ineffectively removed at higher concentrations. Nitrogen is effectively accumulated in rhizomes which could be mechanically ground, composted and returned to agriculture.

Place, publisher, year, edition, pages
2000. Vol. 21, no 2, 217-223 p.
Keyword [en]
agricultural runoff, nitrogen recirculation, Phragmites australis, rhizome accumulation, vertical macrophyte system, experimental wetland, subsurface flow, waste-water, removal, effluents, ammonium, filters
Identifiers
URN: urn:nbn:se:kth:diva-19576ISI: 000085515800011OAI: oai:DiVA.org:kth-19576DiVA: diva2:338268
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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