best available technologies for manure treatment - Baltic Green Belt

Best Available Technologies for manure treatment baltic sea 2020
Best Available Technologies for manure treatment baltic sea 2020
ANNEX E: TABLES WITH SHORT DESPRIPTION OF LIVESTOCK MANURE TREATMENT TECHNOLOGIES
Ref No. 94 Constructed wetlands
Brief description Description of the effect on leaching (positive or negative) of N and P
Constructed wetlands mean an area, where a liquid fraction is flooded
into. The area is grown with a catch crop, which will capture the N, P
and other residues. The crop can be harvested and digested in a
biogas plant, for instance. The liquid fraction that is let to the area is
typically cleaned up to an economic optimum, In order to minimise the
area of the wetland.
Examples of constructed wetlands: In the USA such wetlands are used
for the disposal of the liquid fraction that are collected from feedlots
(Foged, 2009), in Holland for reject water from a nitrificationdenitrification
plant (Foged, 2009), and in Denmark they are seen in
connection to high-tech biogas plants, also for reject water.
The effect shall typically be seen in combination with the entire effect of the livestock manure
treatment facility to which the constructed wetlands belongs.
Innovation stage
Investment price,
Basic Variable
Operational
costs,
per tonnes
per kg
saved N or P
leaching
Complexity of implementation
Research
Pilot
Practice
Foged, 2009
Major references
Prices are
probably similar
to prices of
lagoons. Typically
50,000
Condition for
leaching reduction
effect
Scenarios II - V
40 Low
Certainty of
information
Prices Medium
Effect on
leaching
Medium
Varying with
the concrete
situation.
Medium – can be constructed at all
farms, but typically the wetlands
are only a small part of a complex
livestock manure treatment plant.
80
80