With the Project:
BioCover A/S has developed the SyreN system for the treatment of slurry. This system is a multiple innovation system developed over a period of 10 years. It was initiated to solve the problem of ammonia emission from slurry application to fields. Following a successful research and development period of three years, the system is now operating in a volume of +100 units in Denmark. The essence of the SyreN system is the use of sulphuric acid to control the pH value of the slurry, changing the ammonia gas to ammonium salt.
Intensive livestock farming represents one of the biggest environmental pressures on the planet. Particular matter emissions and excess nutrients from manure (liquid slurry) are causing eutrophication worldwide. Denmark has one of the most intensive animal densities combined with a huge surface (63%) used for agriculture. Because of this combination, there are very strict laws on emission control and the use of slurry.
The technique of acidification (sulphuric acid) is used to change ammonia gas to ammonium salt during the application of slurry. This reduces the emission of ammonia by up to 70% which eliminates airborne eutrophication. At the same time, the method applies the correct amount of sulphur as sulphate fertiliser. As a portable system, it may treat up to 150,000 m3 of slurry per season with costs as low as 25 euro cent per m3.
The SyreN system is integrated in a slurry tanker with a capacity of up to 100,000 m3. It increases the marginal value of the nutrients, making this organic fertiliser competitive compared to mineral fertilisers. Using existing industry standard transport equipment in the process has solved the technical and safety aspects of handling dangerous goods at consumer level. 128 of these systems can currently treat 10% of the whole slurry in Denmark, resulting in a reduction of 1,500 tonnes of ammonia emissions per year.
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