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
Best Available Techniques for manure treatment - for intensive rearing of pigs in Baltic Sea Region EU Member States Technical Report "Best Practice Manure Handling, Phase 2"
Ref No. 21 Ph adjustment, acidification
Brief description
Description of the effect on leaching (positive or
negative) of N and P
pH adjustment is done of the liquid livestock manure / fraction in an acid treatment unit where ammonia is bound with
sulphuric acid (H2SO4) to form ammonium sulphate in order to prevent ammonia emissions from the treatment
process. The acidification is thus a technology, which mainly is used for the purpose of reducing emissions from the
livestock manure, which are closely related to smell/nuisances from the pig production.
Typically 0.5% of the sulphuric acid, equal to 5 kg per tonnes slurry, is able to reduce pH to about 5.5, while pH in fresh
pig slurry in a project is measures to about 7.3 (Siegler, 2009).
The emission of methane from cattle slurry has been measure to be reduced 67-90 % (Jacobsen, 2009), and we must
anticipate a similar effect for pig slurry. The content of N in the slurry is 15-20 % higher than in untreated slurry due to
decreased emission of ammonia from the stable, storage and field (Jacobsen, 2009). Tests show that the emissions of
laughter gas are reduced with 80%.
Less emission of ammonia emissions means that
less N could return as atmospheric deposition
and that more N is re-circulated in the
agricultural production rather than ending in the
environment.
Field trials indicates, that acidification of slurry
affects the field effect.
Field trials have shown higher field effects (bioavailability of nitrogen) of acidified slurry, however with a big variation
between responses in different trials (Sørensen, 2006 and Jensen, 2006).
See further under additives.
Innovation stage
Investment price,
Basic Variable
Operational costs,
per tonnes
per kg
saved N or
P leaching
Complexity of implementation
Research
Pilot
100.000 (?) 50 (?) 2 (?)
Practice
Major references
Condition for leaching reduction
effect
Certainty of information
2-2 (N)
Low – each farm can easily attach an
acidification unit to the slurry system at the
farm.
Jacobsen, 2009
Sørensen, 2006
Jensen, 2006
The effect will be found at all
farms.
Prices Low
Effect on leaching Medium
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