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Glyceria maxima for wastewater nutrient removal and forage production
AbstractPotential biomass yield, nutrient uptake capacity and forage quality of Glyceria maxima was tested in four field lysimeters (I–IV) receiving municipal wastewater. Wastewater was applied during 3 years at different frequencies in order to achieve maximum N-reduction in the system. Accordingly lysimeters III and IV were ponded for part of the week. Harvesting (in June and August) progressively favoured competing terrestrial species in the non-ponded lysimeters (I and II). In year 3 the other species accounted for 65–70% of the harvested biomass in these lysimeters. In the ponded lysimeters (III and IV), reducing conditions in the soil probably prevented terrestrial species from establishing. The total annual yields of the single-species stands in III and IV were 870–1165 gm−2. Energy, protein, P, K and Ca content of the harvested biomass indicated a high nutritional value. NO3−N concentrations in the harvested biomass varied from 0·08 to 0·32% of dry wt, but did not generally exceed 0·2%. Maximum N and P removed with the harvested biomass was 32 and 4·8 gm−2 respectively. The relative removal of nutrients in lysimeters III and IV varied from 26 to 55% of the amount of N applied and from 12 to 28% of P applied, which illustrated the possibilities of adjusting the load for optimization of nutrient re-use rather than disposal.
Glyceria maxima for wastewater nutrient removal and forage production
AbstractPotential biomass yield, nutrient uptake capacity and forage quality of Glyceria maxima was tested in four field lysimeters (I–IV) receiving municipal wastewater. Wastewater was applied during 3 years at different frequencies in order to achieve maximum N-reduction in the system. Accordingly lysimeters III and IV were ponded for part of the week. Harvesting (in June and August) progressively favoured competing terrestrial species in the non-ponded lysimeters (I and II). In year 3 the other species accounted for 65–70% of the harvested biomass in these lysimeters. In the ponded lysimeters (III and IV), reducing conditions in the soil probably prevented terrestrial species from establishing. The total annual yields of the single-species stands in III and IV were 870–1165 gm−2. Energy, protein, P, K and Ca content of the harvested biomass indicated a high nutritional value. NO3−N concentrations in the harvested biomass varied from 0·08 to 0·32% of dry wt, but did not generally exceed 0·2%. Maximum N and P removed with the harvested biomass was 32 and 4·8 gm−2 respectively. The relative removal of nutrients in lysimeters III and IV varied from 26 to 55% of the amount of N applied and from 12 to 28% of P applied, which illustrated the possibilities of adjusting the load for optimization of nutrient re-use rather than disposal.
Glyceria maxima for wastewater nutrient removal and forage production
Sundblad, K. (author) / Wittgren, H.-B. (author)
Biological Wastes ; 27 ; 29-42
1988-04-07
14 pages
Article (Journal)
Electronic Resource
English
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