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Transformation and ...
Abstract
Ämnesord
Stäng
- Nitrogen (N) and phosphorus (P) should be removed and recycled from wastewater in order to reduce the nutrient load to recipient waters, avoid contamination of groundwater and conserve resources. Nitrogen removal and transformation were studied in domestic wastewater percolating in unsaturated conditions through 0.5 m long columns containing potential filter materials. Six materials (three types of slag, limestone, opoka, Polonite(R) and sand) were compared at a design loading rate of 85 L m(-2) d(-1) during 67 weeks. All materials transformed ammonium efficiently to nitrate (>98%). Apparent removal of inorganic N was shown only by the coarsest slag and by Polonite(R), possibly due to losses through volatilisation. All other filter materials leached nitrate at the column effluent. Total N content was highest in the surface layer of the column material, with decreasing values with depth. In contrast, carbon
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
Nyckelord
- Ammonium removal
- Blast furnace slag
- Column experiment
- Nitrification
- Polonite (R)
- flow constructed wetlands
- phosphorus retention
- ammonium removal
- ion-exchange
- sand-filters
- subsurface flow
- shell sand
- denitrification
- performance
- effluent
- Environmental engineering
- Miljöteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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