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. 56 Aeration
Brief description Description of the effect on leaching (positive or negative) of N and P
The term “aerobic treatment” refers to biological treatment processes that occur in the presence of oxygen. In these processes,
aerobic microorganisms oxidize bio-available organic and nitrogenous compounds. Removal of these oxygen demanding
compounds provides a means to reduce odor emission and to reduce ammonia emissions. Aerobic treatment has not been
used much in treatment of liquid or slurry manure primarily due to the relation between the benefits and the extra costs
associated with operating the motors, compressors or fans required to supply enough oxygen to support aerobic bacteria.
Several types of aeration of slurry were tested.
Aeration may be partly to convert ammonia to nitrate, which can subsequently be transformed into free N by denitrification,
partly to reduce levels of organic matter in the liquid fraction. Nitrification (conversion of ammonia to nitrate) is very energyintensive
in terms of power consumption for aeration, stirring, etc. If nitrate subsequently is converted into free N by
denitrification a portion of the organic material in the slurry will be consumed. N and organic matter is lost in the process, and
at the same time significant amounts of energy are consumed. The amount of aeration needed (in increasing order) depends
on whether it is desired to just reduce odour, or completely remove the oxygen demand of the organic matter, or to supply
enough oxygen for oxidation of ammonium to nitrate.
See comments under composting –
reference numbers 41 and 41A.
Innovation stage
Investment price,
Basic Variable
Operational
costs,
per tonnes
per kg saved N
or P leaching
Complexity of
implementation
Research
Pilot
Practice
Low – can be performed without existing pumps, equipment and
machinery on the farm
Probably <
1 per ton
Major references Condition for leaching reduction effect Certainty of information
Foged, 2009 Scenarios II - V
Prices High
Effect on leaching High
Depends on the
situation of the
individual farm.
Low.
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