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. 15 Separation by centrifuge
Brief description
Description of the effect on leaching (positive or negative) of N
and P
The manure is being centrifuged with 3.000 – 4.000 r/minute, so the liquid is separated from the fibre
fraction. The fibre fraction is continuously moved out of the drum by a slower rotating conveyer.
The centrifuge has high capacity, and good separation efficiency, but fairly high investment.
Centrifuge Content in fibre fraction
In case the livestock density in an area is the maximally allowed
according the Nitrates Directive, the application of livestock
manure would typically mean the double of the needs of the crops
concerning P.
Capacity (t/h) N P % of total volume % DM (dry matter)
By exporting the fibre fraction to areas with a low livestock
density, over-fertilisation and leaching of excess P can be avoided.
6 20 % 70 % 10 % 30 %
Innovation stage
Research
Pilot
Practice
Major references
1: Nielsen, 2008
2: EU Commission,
2003
Investment price,
Basic Variable
Operational
costs
per tonnes
~ 100.000 1,00 0,70
Condition for leaching
reduction effect
Scenarios II – V
Certainty of information
Prices High
Effect on
leaching
High
per kg saved N or
P leaching
No data
Complexity of implementation
Medium, there are several commercial plants/machines on the
market, and is quite easily to install on the farm if the conditions
at the farm are suitable concerning stable systems, storage tanks
etc.
But the investment is fairly high, and also the demands for
capacity of flow of material/manure.
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